From 5ad07447829c9954d74cf1602e0c9077184363e4 Mon Sep 17 00:00:00 2001
From: Christian Lewis <ctjl96@gmail.com>
Date: Sun, 19 Jul 2020 17:47:21 -0500
Subject: [PATCH 01/28] Added support for UnicodeCombiningMark, fixes #3639.

---
 build.sh                                      |  2 +
 .../jscomp/parsing/parser/Scanner.java        | 50 ++++++++++++++++++-
 test.js                                       |  3 ++
 3 files changed, 53 insertions(+), 2 deletions(-)
 create mode 100755 build.sh
 create mode 100644 test.js

diff --git a/build.sh b/build.sh
new file mode 100755
index 00000000000..aa6fe9057b1
--- /dev/null
+++ b/build.sh
@@ -0,0 +1,2 @@
+#!/bin/bash
+mvn -DskipTests -pl externs/pom.xml,pom-main.xml,pom-main-shaded.xml
\ No newline at end of file
diff --git a/src/com/google/javascript/jscomp/parsing/parser/Scanner.java b/src/com/google/javascript/jscomp/parsing/parser/Scanner.java
index 95a35651fef..60e2ae94e8d 100644
--- a/src/com/google/javascript/jscomp/parsing/parser/Scanner.java
+++ b/src/com/google/javascript/jscomp/parsing/parser/Scanner.java
@@ -901,8 +901,52 @@ private static boolean isIdentifierStart(char ch) {
         | (ch >= 0x03B1 & ch <= 0x03C9); // Greek lowercase letters
   }
 
+  /**
+    Implement ECMAScript grammar for isIdentifierPart.
+   */
+  private static boolean isCombiningMark(char ch) {
+    return Character.getType(ch) == Character.NON_SPACING_MARK;
+  }
+
+  // TODO (ctjl): Implement
+  private static boolean isConnectorPunctuation() {
+    return true;
+  }
+
+  // TODO (ctjl): Implement
+  private static boolean isZeroWidthJoiner() {
+    return true;
+  }
+
+  // TODO (ctjl): Implement
+  private static boolean isZeroWidthNonJoiner() {
+    return true;
+  }
+
   @SuppressWarnings("ShortCircuitBoolean") // Intentional to minimize branches in this code
   private static boolean isIdentifierPart(char ch) {
+    /**
+      https://www.ecma-international.org/ecma-262/5.1/#sec-7.6
+      IdentifierPart ::
+        IdentifierStart
+        ✓ isIdentifierPart()
+
+        UnicodeCombiningMark
+        ✓ isCombiningMark()
+
+        UnicodeDigit
+        ✓ Character.isDigit()
+
+        UnicodeConnectorPunctuation
+        ✓ isConnectorPunctuation()
+
+        <ZWNJ>
+        ✓ isZeroWidthNonJoiner()
+          
+        <ZWJ>
+        ✓ isZeroWidthJoiner()
+     */
+
     // Most code is written in pure ASCII, so create a fast path here.
     if (ch <= 127) {
       return ((ch >= 'A' & ch <= 'Z')
@@ -913,8 +957,10 @@ private static boolean isIdentifierPart(char ch) {
 
     // Handle non-ASCII characters.
     // TODO(tjgq): This should include all characters with the ID_Continue property, plus
-    // Zero Width Non-Joiner and Zero Width Joiner.
-    return isIdentifierStart(ch) || Character.isDigit(ch);
+    // TODO(ctjl): Implement remaining grammar (zero-width joiners, etc.)
+    return isIdentifierStart(ch)
+        || isCombiningMark(ch)
+        || Character.isDigit(ch);
   }
 
   private Token scanStringLiteral(int beginIndex, char terminator) {
diff --git a/test.js b/test.js
new file mode 100644
index 00000000000..72f88fe9bf0
--- /dev/null
+++ b/test.js
@@ -0,0 +1,3 @@
+var bar = {
+  İ: "foo"
+};
\ No newline at end of file

From 93ed59e2b52cbdf0c0a96a32b9e54a4e56473507 Mon Sep 17 00:00:00 2001
From: Christian Lewis <ctjl96@gmail.com>
Date: Sun, 19 Jul 2020 18:15:28 -0500
Subject: [PATCH 02/28] Removed unnecessary test script, moved scripts to
 utils/.

---
 test.js                    | 3 ---
 build.sh => utils/build.sh | 1 +
 utils/run.sh               | 4 ++++
 3 files changed, 5 insertions(+), 3 deletions(-)
 delete mode 100644 test.js
 rename build.sh => utils/build.sh (70%)
 create mode 100755 utils/run.sh

diff --git a/test.js b/test.js
deleted file mode 100644
index 72f88fe9bf0..00000000000
--- a/test.js
+++ /dev/null
@@ -1,3 +0,0 @@
-var bar = {
-  İ: "foo"
-};
\ No newline at end of file
diff --git a/build.sh b/utils/build.sh
similarity index 70%
rename from build.sh
rename to utils/build.sh
index aa6fe9057b1..d975c954e3a 100755
--- a/build.sh
+++ b/utils/build.sh
@@ -1,2 +1,3 @@
 #!/bin/bash
+# Build the compiler without GWT.
 mvn -DskipTests -pl externs/pom.xml,pom-main.xml,pom-main-shaded.xml
\ No newline at end of file
diff --git a/utils/run.sh b/utils/run.sh
new file mode 100755
index 00000000000..ec4d9881b9b
--- /dev/null
+++ b/utils/run.sh
@@ -0,0 +1,4 @@
+#!/bin/bash
+# Run the local build of CC in target/. Make sure to run build.sh before running
+# this script.
+java -jar target/closure-compiler-1.0-SNAPSHOT.jar $@
\ No newline at end of file

From 7d2ea29fc2ed816807b082023b9b84045a05e040 Mon Sep 17 00:00:00 2001
From: Christian Lewis <ctjl96@gmail.com>
Date: Sun, 19 Jul 2020 18:16:33 -0500
Subject: [PATCH 03/28] Added newlines for formatting

---
 utils/build.sh | 2 +-
 utils/run.sh   | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/utils/build.sh b/utils/build.sh
index d975c954e3a..b3a8b6739f1 100755
--- a/utils/build.sh
+++ b/utils/build.sh
@@ -1,3 +1,3 @@
 #!/bin/bash
 # Build the compiler without GWT.
-mvn -DskipTests -pl externs/pom.xml,pom-main.xml,pom-main-shaded.xml
\ No newline at end of file
+mvn -DskipTests -pl externs/pom.xml,pom-main.xml,pom-main-shaded.xml
diff --git a/utils/run.sh b/utils/run.sh
index ec4d9881b9b..fc505aa05d7 100755
--- a/utils/run.sh
+++ b/utils/run.sh
@@ -1,4 +1,4 @@
 #!/bin/bash
 # Run the local build of CC in target/. Make sure to run build.sh before running
 # this script.
-java -jar target/closure-compiler-1.0-SNAPSHOT.jar $@
\ No newline at end of file
+java -jar target/closure-compiler-1.0-SNAPSHOT.jar $@

From 3c5ee215a1648b2b35634a0a765c9598c9b15508 Mon Sep 17 00:00:00 2001
From: Christian Lewis <ctjl96@gmail.com>
Date: Sun, 19 Jul 2020 19:28:10 -0500
Subject: [PATCH 04/28] Patched isCombiningMark to check Unicode space manually
 rather than relying on java.lang.Character.

---
 bazel-bin                                     |  1 +
 bazel-closure-compiler                        |  1 +
 bazel-out                                     |  1 +
 bazel-testlogs                                |  1 +
 .../jscomp/parsing/parser/Scanner.java        | 22 +++++++++++++++----
 test.js                                       |  3 +++
 6 files changed, 25 insertions(+), 4 deletions(-)
 create mode 120000 bazel-bin
 create mode 120000 bazel-closure-compiler
 create mode 120000 bazel-out
 create mode 120000 bazel-testlogs
 create mode 100644 test.js

diff --git a/bazel-bin b/bazel-bin
new file mode 120000
index 00000000000..d67a3388683
--- /dev/null
+++ b/bazel-bin
@@ -0,0 +1 @@
+/home/christian/.cache/bazel/_bazel_christian/104d3f45ba5206b8827c9e2fc4354936/execroot/com_google_javascript_jscomp/bazel-out/k8-fastbuild/bin
\ No newline at end of file
diff --git a/bazel-closure-compiler b/bazel-closure-compiler
new file mode 120000
index 00000000000..5557eae06c2
--- /dev/null
+++ b/bazel-closure-compiler
@@ -0,0 +1 @@
+/home/christian/.cache/bazel/_bazel_christian/104d3f45ba5206b8827c9e2fc4354936/execroot/com_google_javascript_jscomp
\ No newline at end of file
diff --git a/bazel-out b/bazel-out
new file mode 120000
index 00000000000..35b5ffcd568
--- /dev/null
+++ b/bazel-out
@@ -0,0 +1 @@
+/home/christian/.cache/bazel/_bazel_christian/104d3f45ba5206b8827c9e2fc4354936/execroot/com_google_javascript_jscomp/bazel-out
\ No newline at end of file
diff --git a/bazel-testlogs b/bazel-testlogs
new file mode 120000
index 00000000000..8836eace142
--- /dev/null
+++ b/bazel-testlogs
@@ -0,0 +1 @@
+/home/christian/.cache/bazel/_bazel_christian/104d3f45ba5206b8827c9e2fc4354936/execroot/com_google_javascript_jscomp/bazel-out/k8-fastbuild/testlogs
\ No newline at end of file
diff --git a/src/com/google/javascript/jscomp/parsing/parser/Scanner.java b/src/com/google/javascript/jscomp/parsing/parser/Scanner.java
index 60e2ae94e8d..d19120162b4 100644
--- a/src/com/google/javascript/jscomp/parsing/parser/Scanner.java
+++ b/src/com/google/javascript/jscomp/parsing/parser/Scanner.java
@@ -23,6 +23,7 @@
 import com.google.javascript.jscomp.parsing.parser.util.SourcePosition;
 import com.google.javascript.jscomp.parsing.parser.util.SourceRange;
 import java.util.ArrayList;
+import java.lang.Character;
 import javax.annotation.Nullable;
 
 /**
@@ -901,11 +902,24 @@ private static boolean isIdentifierStart(char ch) {
         | (ch >= 0x03B1 & ch <= 0x03C9); // Greek lowercase letters
   }
 
-  /**
-    Implement ECMAScript grammar for isIdentifierPart.
-   */
+  // Check if char is Unicode Category "Combining spacing mark (Mc)"
+  // This list is not exhaustive!
+  @SuppressWarnings("ShortCircuitBoolean") // Intentional to minimize branches in this code
   private static boolean isCombiningMark(char ch) {
-    return Character.getType(ch) == Character.NON_SPACING_MARK;
+    return (
+      // 0300-036F
+      (0x0300 <= ch & ch <= 0x036F) |
+      // 1AB0–1AFF
+      (0x1AB0 <= ch & ch <= 0x1AFF) |
+      // 1DC0–1DFF
+      (0x1DC0 <= ch & ch <= 0x1DFF) |
+      // 20D0–20FF
+      (0x20D0 <= ch & ch <= 0x20FF) |
+      // FE20–FE2F
+      (0xFE20 <= ch & ch <= 0xFE2F)
+    );
+    // TODO (ctjl): Implement in a more reliable and future-proofed way, i.e.:
+    // return Character.getType(ch) == Character.NON_SPACING_MARK;
   }
 
   // TODO (ctjl): Implement
diff --git a/test.js b/test.js
new file mode 100644
index 00000000000..72f88fe9bf0
--- /dev/null
+++ b/test.js
@@ -0,0 +1,3 @@
+var bar = {
+  İ: "foo"
+};
\ No newline at end of file

From b3a720c8c6fa347b6142efbaea821f85992ce5d5 Mon Sep 17 00:00:00 2001
From: Christian Lewis <ctjl96@gmail.com>
Date: Sun, 19 Jul 2020 19:32:00 -0500
Subject: [PATCH 05/28] Added bazel output symlinks to .gitignore and removed
 from tree.

---
 .gitignore             | 6 ++++++
 bazel-bin              | 1 -
 bazel-closure-compiler | 1 -
 bazel-out              | 1 -
 bazel-testlogs         | 1 -
 5 files changed, 6 insertions(+), 4 deletions(-)
 delete mode 120000 bazel-bin
 delete mode 120000 bazel-closure-compiler
 delete mode 120000 bazel-out
 delete mode 120000 bazel-testlogs

diff --git a/.gitignore b/.gitignore
index 782b051f1c7..70c53e60ad3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -12,3 +12,9 @@ target/
 /yarn.lock
 /node_modules
 /.metadata/
+
+# Bazel stuff
+/bazel-bin
+/bazel-closure-compiler
+/bazel-out
+/bazel-testlogs
\ No newline at end of file
diff --git a/bazel-bin b/bazel-bin
deleted file mode 120000
index d67a3388683..00000000000
--- a/bazel-bin
+++ /dev/null
@@ -1 +0,0 @@
-/home/christian/.cache/bazel/_bazel_christian/104d3f45ba5206b8827c9e2fc4354936/execroot/com_google_javascript_jscomp/bazel-out/k8-fastbuild/bin
\ No newline at end of file
diff --git a/bazel-closure-compiler b/bazel-closure-compiler
deleted file mode 120000
index 5557eae06c2..00000000000
--- a/bazel-closure-compiler
+++ /dev/null
@@ -1 +0,0 @@
-/home/christian/.cache/bazel/_bazel_christian/104d3f45ba5206b8827c9e2fc4354936/execroot/com_google_javascript_jscomp
\ No newline at end of file
diff --git a/bazel-out b/bazel-out
deleted file mode 120000
index 35b5ffcd568..00000000000
--- a/bazel-out
+++ /dev/null
@@ -1 +0,0 @@
-/home/christian/.cache/bazel/_bazel_christian/104d3f45ba5206b8827c9e2fc4354936/execroot/com_google_javascript_jscomp/bazel-out
\ No newline at end of file
diff --git a/bazel-testlogs b/bazel-testlogs
deleted file mode 120000
index 8836eace142..00000000000
--- a/bazel-testlogs
+++ /dev/null
@@ -1 +0,0 @@
-/home/christian/.cache/bazel/_bazel_christian/104d3f45ba5206b8827c9e2fc4354936/execroot/com_google_javascript_jscomp/bazel-out/k8-fastbuild/testlogs
\ No newline at end of file

From 590f2dcde4398ee297097c7f86ff2183d0cc273e Mon Sep 17 00:00:00 2001
From: Christian Lewis <ctjl96@gmail.com>
Date: Sun, 19 Jul 2020 19:32:50 -0500
Subject: [PATCH 06/28] Removed unneeded java.lang.Character import.

---
 src/com/google/javascript/jscomp/parsing/parser/Scanner.java | 1 -
 1 file changed, 1 deletion(-)

diff --git a/src/com/google/javascript/jscomp/parsing/parser/Scanner.java b/src/com/google/javascript/jscomp/parsing/parser/Scanner.java
index d19120162b4..2308d0ffb2e 100644
--- a/src/com/google/javascript/jscomp/parsing/parser/Scanner.java
+++ b/src/com/google/javascript/jscomp/parsing/parser/Scanner.java
@@ -23,7 +23,6 @@
 import com.google.javascript.jscomp.parsing.parser.util.SourcePosition;
 import com.google.javascript.jscomp.parsing.parser.util.SourceRange;
 import java.util.ArrayList;
-import java.lang.Character;
 import javax.annotation.Nullable;
 
 /**

From 1ecfd75f7436d2ede1b7a66e0c7012a4a946f410 Mon Sep 17 00:00:00 2001
From: Christian Lewis <ctjl96@gmail.com>
Date: Sun, 19 Jul 2020 20:08:19 -0500
Subject: [PATCH 07/28] Removed unneeded test.js.

---
 test.js | 3 ---
 1 file changed, 3 deletions(-)
 delete mode 100644 test.js

diff --git a/test.js b/test.js
deleted file mode 100644
index 72f88fe9bf0..00000000000
--- a/test.js
+++ /dev/null
@@ -1,3 +0,0 @@
-var bar = {
-  İ: "foo"
-};
\ No newline at end of file

From 696e2017a29d95ccaa87dfa135bf62f44e1572cc Mon Sep 17 00:00:00 2001
From: Christian Lewis <ctjl96@gmail.com>
Date: Mon, 20 Jul 2020 20:00:37 -0500
Subject: [PATCH 08/28] Adding support for non-ASCII Unicode.

---
 .../jscomp/parsing/parser/Scanner.java        | 112 ++----------------
 .../parsing/parser/util/UnicodeMatch.java     |  96 +++++++++++++++
 travis_util/test_npm.sh                       |   4 +
 utils/build.sh                                |   2 +-
 4 files changed, 111 insertions(+), 103 deletions(-)
 create mode 100644 src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java

diff --git a/src/com/google/javascript/jscomp/parsing/parser/Scanner.java b/src/com/google/javascript/jscomp/parsing/parser/Scanner.java
index 2308d0ffb2e..e6c9d6c4732 100644
--- a/src/com/google/javascript/jscomp/parsing/parser/Scanner.java
+++ b/src/com/google/javascript/jscomp/parsing/parser/Scanner.java
@@ -22,6 +22,7 @@
 import com.google.javascript.jscomp.parsing.parser.util.ErrorReporter;
 import com.google.javascript.jscomp.parsing.parser.util.SourcePosition;
 import com.google.javascript.jscomp.parsing.parser.util.SourceRange;
+import com.google.javascript.jscomp.parsing.parser.util.UnicodeMatch;
 import java.util.ArrayList;
 import javax.annotation.Nullable;
 
@@ -869,111 +870,18 @@ private static String processUnicodeEscapes(String value) {
     return value;
   }
 
-  @SuppressWarnings("ShortCircuitBoolean") // Intentional to minimize branches in this code
+  /**
+   * Interface from UnicodeRegex. Includes old optimizations.
+   */
   private static boolean isIdentifierStart(char ch) {
-    // Most code is written in pure ASCII, so create a fast path here.
-    if (ch <= 127) {
-      // Intentionally avoiding short circuiting behavior of "||" and "&&".
-      // This minimizes branches in this code which minimizes branch prediction misses.
-      return ((ch >= 'A' & ch <= 'Z') | (ch >= 'a' & ch <= 'z') | (ch == '_' | ch == '$'));
-    }
-
-    // Handle non-ASCII characters.
-    // TODO(tjgq): This should include all characters with the ID_Start property.
-    if (Character.isLetter(ch)) {
-      return true;
-    }
-
-    // Workaround for b/36459436.
-    // When running under GWT/J2CL, Character.isLetter only handles ASCII.
-    // Angular relies heavily on Latin Small Letter Barred O and Greek Capital Letter Delta.
-    // Greek letters are occasionally found in math code.
-    // Latin letters are found in our own tests.
-    return (ch >= 0x00C0 & ch <= 0x00D6) // Latin letters
-        // 0x00D7 = multiplication sign, not a letter
-        | (ch >= 0x00D8 & ch <= 0x00F6) // Latin letters
-        // 0x00F7 = division sign, not a letter
-        | (ch >= 0x00F8 & ch <= 0x00FF) // Latin letters
-        | ch == 0x0275 // Latin Barred O
-        | (ch >= 0x0391 & ch <= 0x03A1) // Greek uppercase letters
-        // 0x03A2 = unassigned
-        | (ch >= 0x03A3 & ch <= 0x03A9) // Remaining Greek uppercase letters
-        | (ch >= 0x03B1 & ch <= 0x03C9); // Greek lowercase letters
-  }
-
-  // Check if char is Unicode Category "Combining spacing mark (Mc)"
-  // This list is not exhaustive!
-  @SuppressWarnings("ShortCircuitBoolean") // Intentional to minimize branches in this code
-  private static boolean isCombiningMark(char ch) {
-    return (
-      // 0300-036F
-      (0x0300 <= ch & ch <= 0x036F) |
-      // 1AB0–1AFF
-      (0x1AB0 <= ch & ch <= 0x1AFF) |
-      // 1DC0–1DFF
-      (0x1DC0 <= ch & ch <= 0x1DFF) |
-      // 20D0–20FF
-      (0x20D0 <= ch & ch <= 0x20FF) |
-      // FE20–FE2F
-      (0xFE20 <= ch & ch <= 0xFE2F)
-    );
-    // TODO (ctjl): Implement in a more reliable and future-proofed way, i.e.:
-    // return Character.getType(ch) == Character.NON_SPACING_MARK;
-  }
-
-  // TODO (ctjl): Implement
-  private static boolean isConnectorPunctuation() {
-    return true;
+    return UnicodeMatch.isJavascriptIdentifierStart(ch);
   }
-
-  // TODO (ctjl): Implement
-  private static boolean isZeroWidthJoiner() {
-    return true;
-  }
-
-  // TODO (ctjl): Implement
-  private static boolean isZeroWidthNonJoiner() {
-    return true;
-  }
-
-  @SuppressWarnings("ShortCircuitBoolean") // Intentional to minimize branches in this code
+  
+  /**
+   * Interface from UnicodeRegex. Includes old optimizations.
+   */
   private static boolean isIdentifierPart(char ch) {
-    /**
-      https://www.ecma-international.org/ecma-262/5.1/#sec-7.6
-      IdentifierPart ::
-        IdentifierStart
-        ✓ isIdentifierPart()
-
-        UnicodeCombiningMark
-        ✓ isCombiningMark()
-
-        UnicodeDigit
-        ✓ Character.isDigit()
-
-        UnicodeConnectorPunctuation
-        ✓ isConnectorPunctuation()
-
-        <ZWNJ>
-        ✓ isZeroWidthNonJoiner()
-          
-        <ZWJ>
-        ✓ isZeroWidthJoiner()
-     */
-
-    // Most code is written in pure ASCII, so create a fast path here.
-    if (ch <= 127) {
-      return ((ch >= 'A' & ch <= 'Z')
-          | (ch >= 'a' & ch <= 'z')
-          | (ch >= '0' & ch <= '9')
-          | (ch == '_' | ch == '$'));
-    }
-
-    // Handle non-ASCII characters.
-    // TODO(tjgq): This should include all characters with the ID_Continue property, plus
-    // TODO(ctjl): Implement remaining grammar (zero-width joiners, etc.)
-    return isIdentifierStart(ch)
-        || isCombiningMark(ch)
-        || Character.isDigit(ch);
+    return UnicodeMatch.isJavascriptIdentifierPart(ch);
   }
 
   private Token scanStringLiteral(int beginIndex, char terminator) {
diff --git a/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java b/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
new file mode 100644
index 00000000000..0cdcac5107c
--- /dev/null
+++ b/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
@@ -0,0 +1,96 @@
+/*
+ * Copyright 2020 The Closure Compiler Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.javascript.jscomp.parsing.parser.util;
+
+import java.util.regex.Pattern;
+
+/**
+ * Exposes non-ASCII unicode detection for Javascript identifiers in compliance
+ * with ECMAScript spec. Retains old optimizations for commonly-used characters,
+ * namely ASCII and Latin/Greek charsets. Uses regex for remaining characters
+ * (which would throw errors otherwise).
+ */
+public class UnicodeMatch {
+  // Intentional to minimize branches in this code
+  @SuppressWarnings("ShortCircuitBoolean")
+  private static boolean fastPathLetters(char ch) {
+    return (
+      // ASCII
+      ('A' <= ch & ch <= 'Z') |
+      ('a' <= ch & ch <= 'z') |
+      (ch == '_' | ch == '$') |
+      // Latin letters
+      (0x00C0 <= ch & ch <= 0x00D6) |
+      // Latin letters
+      (0x00D8 <= ch & ch <= 0x00F6) |
+      // Latin letters
+      (0x00F8 <= ch & ch <= 0x00FF) |
+      // Latin Barred O
+      (ch == 0x0275) |
+      // Greek uppercase letters
+      (0x0391 <= ch & ch <= 0x03A1) |
+      // Remaining Greek uppercase letters
+      (0x03A3 <= ch & ch <= 0x03A9) |
+      // Greek lowercase letters
+      (0x03B1 <= ch & ch <= 0x03C9)
+    );
+  }
+
+  // Intentional to minimize branches in this code
+  @SuppressWarnings("ShortCircuitBoolean")
+  private static boolean fastPathDigits(char ch) {
+    return '0' <= ch & ch <= '9';
+  }
+
+  public static boolean isJavascriptIdentifierStart(char ch) {
+    return fastPathLetters(ch)
+        || JavascriptIdentifierStart
+              .matcher(Character.toString(ch))
+              .matches();
+  }
+
+  public static boolean isJavascriptIdentifierPart(char ch) {
+    return (fastPathLetters(ch) | fastPathDigits(ch))
+        || JavascriptIdentifierPart
+              .matcher(Character.toString(ch))
+              .matches();
+  }
+
+  /**
+    https://www.ecma-international.org/ecma-262/5.1/#sec-7.6
+    
+    IdentifierStart ::
+      UnicodeLetter: isUnicodeLetter()
+      $: Character == '$'
+      _: Character == '_'
+      \ UnicodeEscapeSequence: isEscapeSequence()
+  */
+  private static final Pattern JavascriptIdentifierStart = Pattern.compile("(?:[\\$A-Z_a-z\\xAA\\xB5\\xBA\\xC0-\\xD6\\xD8-\\xF6\\xF8-\\u02C1\\u02C6-\\u02D1\\u02E0-\\u02E4\\u02EC\\u02EE\\u0370-\\u0374\\u0376\\u0377\\u037A-\\u037D\\u037F\\u0386\\u0388-\\u038A\\u038C\\u038E-\\u03A1\\u03A3-\\u03F5\\u03F7-\\u0481\\u048A-\\u052F\\u0531-\\u0556\\u0559\\u0560-\\u0588\\u05D0-\\u05EA\\u05EF-\\u05F2\\u0620-\\u064A\\u066E\\u066F\\u0671-\\u06D3\\u06D5\\u06E5\\u06E6\\u06EE\\u06EF\\u06FA-\\u06FC\\u06FF\\u0710\\u0712-\\u072F\\u074D-\\u07A5\\u07B1\\u07CA-\\u07EA\\u07F4\\u07F5\\u07FA\\u0800-\\u0815\\u081A\\u0824\\u0828\\u0840-\\u0858\\u0860-\\u086A\\u08A0-\\u08B4\\u08B6-\\u08C7\\u0904-\\u0939\\u093D\\u0950\\u0958-\\u0961\\u0971-\\u0980\\u0985-\\u098C\\u098F\\u0990\\u0993-\\u09A8\\u09AA-\\u09B0\\u09B2\\u09B6-\\u09B9\\u09BD\\u09CE\\u09DC\\u09DD\\u09DF-\\u09E1\\u09F0\\u09F1\\u09FC\\u0A05-\\u0A0A\\u0A0F\\u0A10\\u0A13-\\u0A28\\u0A2A-\\u0A30\\u0A32\\u0A33\\u0A35\\u0A36\\u0A38\\u0A39\\u0A59-\\u0A5C\\u0A5E\\u0A72-\\u0A74\\u0A85-\\u0A8D\\u0A8F-\\u0A91\\u0A93-\\u0AA8\\u0AAA-\\u0AB0\\u0AB2\\u0AB3\\u0AB5-\\u0AB9\\u0ABD\\u0AD0\\u0AE0\\u0AE1\\u0AF9\\u0B05-\\u0B0C\\u0B0F\\u0B10\\u0B13-\\u0B28\\u0B2A-\\u0B30\\u0B32\\u0B33\\u0B35-\\u0B39\\u0B3D\\u0B5C\\u0B5D\\u0B5F-\\u0B61\\u0B71\\u0B83\\u0B85-\\u0B8A\\u0B8E-\\u0B90\\u0B92-\\u0B95\\u0B99\\u0B9A\\u0B9C\\u0B9E\\u0B9F\\u0BA3\\u0BA4\\u0BA8-\\u0BAA\\u0BAE-\\u0BB9\\u0BD0\\u0C05-\\u0C0C\\u0C0E-\\u0C10\\u0C12-\\u0C28\\u0C2A-\\u0C39\\u0C3D\\u0C58-\\u0C5A\\u0C60\\u0C61\\u0C80\\u0C85-\\u0C8C\\u0C8E-\\u0C90\\u0C92-\\u0CA8\\u0CAA-\\u0CB3\\u0CB5-\\u0CB9\\u0CBD\\u0CDE\\u0CE0\\u0CE1\\u0CF1\\u0CF2\\u0D04-\\u0D0C\\u0D0E-\\u0D10\\u0D12-\\u0D3A\\u0D3D\\u0D4E\\u0D54-\\u0D56\\u0D5F-\\u0D61\\u0D7A-\\u0D7F\\u0D85-\\u0D96\\u0D9A-\\u0DB1\\u0DB3-\\u0DBB\\u0DBD\\u0DC0-\\u0DC6\\u0E01-\\u0E30\\u0E32\\u0E33\\u0E40-\\u0E46\\u0E81\\u0E82\\u0E84\\u0E86-\\u0E8A\\u0E8C-\\u0EA3\\u0EA5\\u0EA7-\\u0EB0\\u0EB2\\u0EB3\\u0EBD\\u0EC0-\\u0EC4\\u0EC6\\u0EDC-\\u0EDF\\u0F00\\u0F40-\\u0F47\\u0F49-\\u0F6C\\u0F88-\\u0F8C\\u1000-\\u102A\\u103F\\u1050-\\u1055\\u105A-\\u105D\\u1061\\u1065\\u1066\\u106E-\\u1070\\u1075-\\u1081\\u108E\\u10A0-\\u10C5\\u10C7\\u10CD\\u10D0-\\u10FA\\u10FC-\\u1248\\u124A-\\u124D\\u1250-\\u1256\\u1258\\u125A-\\u125D\\u1260-\\u1288\\u128A-\\u128D\\u1290-\\u12B0\\u12B2-\\u12B5\\u12B8-\\u12BE\\u12C0\\u12C2-\\u12C5\\u12C8-\\u12D6\\u12D8-\\u1310\\u1312-\\u1315\\u1318-\\u135A\\u1380-\\u138F\\u13A0-\\u13F5\\u13F8-\\u13FD\\u1401-\\u166C\\u166F-\\u167F\\u1681-\\u169A\\u16A0-\\u16EA\\u16EE-\\u16F8\\u1700-\\u170C\\u170E-\\u1711\\u1720-\\u1731\\u1740-\\u1751\\u1760-\\u176C\\u176E-\\u1770\\u1780-\\u17B3\\u17D7\\u17DC\\u1820-\\u1878\\u1880-\\u18A8\\u18AA\\u18B0-\\u18F5\\u1900-\\u191E\\u1950-\\u196D\\u1970-\\u1974\\u1980-\\u19AB\\u19B0-\\u19C9\\u1A00-\\u1A16\\u1A20-\\u1A54\\u1AA7\\u1B05-\\u1B33\\u1B45-\\u1B4B\\u1B83-\\u1BA0\\u1BAE\\u1BAF\\u1BBA-\\u1BE5\\u1C00-\\u1C23\\u1C4D-\\u1C4F\\u1C5A-\\u1C7D\\u1C80-\\u1C88\\u1C90-\\u1CBA\\u1CBD-\\u1CBF\\u1CE9-\\u1CEC\\u1CEE-\\u1CF3\\u1CF5\\u1CF6\\u1CFA\\u1D00-\\u1DBF\\u1E00-\\u1F15\\u1F18-\\u1F1D\\u1F20-\\u1F45\\u1F48-\\u1F4D\\u1F50-\\u1F57\\u1F59\\u1F5B\\u1F5D\\u1F5F-\\u1F7D\\u1F80-\\u1FB4\\u1FB6-\\u1FBC\\u1FBE\\u1FC2-\\u1FC4\\u1FC6-\\u1FCC\\u1FD0-\\u1FD3\\u1FD6-\\u1FDB\\u1FE0-\\u1FEC\\u1FF2-\\u1FF4\\u1FF6-\\u1FFC\\u2071\\u207F\\u2090-\\u209C\\u2102\\u2107\\u210A-\\u2113\\u2115\\u2118-\\u211D\\u2124\\u2126\\u2128\\u212A-\\u2139\\u213C-\\u213F\\u2145-\\u2149\\u214E\\u2160-\\u2188\\u2C00-\\u2C2E\\u2C30-\\u2C5E\\u2C60-\\u2CE4\\u2CEB-\\u2CEE\\u2CF2\\u2CF3\\u2D00-\\u2D25\\u2D27\\u2D2D\\u2D30-\\u2D67\\u2D6F\\u2D80-\\u2D96\\u2DA0-\\u2DA6\\u2DA8-\\u2DAE\\u2DB0-\\u2DB6\\u2DB8-\\u2DBE\\u2DC0-\\u2DC6\\u2DC8-\\u2DCE\\u2DD0-\\u2DD6\\u2DD8-\\u2DDE\\u3005-\\u3007\\u3021-\\u3029\\u3031-\\u3035\\u3038-\\u303C\\u3041-\\u3096\\u309B-\\u309F\\u30A1-\\u30FA\\u30FC-\\u30FF\\u3105-\\u312F\\u3131-\\u318E\\u31A0-\\u31BF\\u31F0-\\u31FF\\u3400-\\u4DBF\\u4E00-\\u9FFC\\uA000-\\uA48C\\uA4D0-\\uA4FD\\uA500-\\uA60C\\uA610-\\uA61F\\uA62A\\uA62B\\uA640-\\uA66E\\uA67F-\\uA69D\\uA6A0-\\uA6EF\\uA717-\\uA71F\\uA722-\\uA788\\uA78B-\\uA7BF\\uA7C2-\\uA7CA\\uA7F5-\\uA801\\uA803-\\uA805\\uA807-\\uA80A\\uA80C-\\uA822\\uA840-\\uA873\\uA882-\\uA8B3\\uA8F2-\\uA8F7\\uA8FB\\uA8FD\\uA8FE\\uA90A-\\uA925\\uA930-\\uA946\\uA960-\\uA97C\\uA984-\\uA9B2\\uA9CF\\uA9E0-\\uA9E4\\uA9E6-\\uA9EF\\uA9FA-\\uA9FE\\uAA00-\\uAA28\\uAA40-\\uAA42\\uAA44-\\uAA4B\\uAA60-\\uAA76\\uAA7A\\uAA7E-\\uAAAF\\uAAB1\\uAAB5\\uAAB6\\uAAB9-\\uAABD\\uAAC0\\uAAC2\\uAADB-\\uAADD\\uAAE0-\\uAAEA\\uAAF2-\\uAAF4\\uAB01-\\uAB06\\uAB09-\\uAB0E\\uAB11-\\uAB16\\uAB20-\\uAB26\\uAB28-\\uAB2E\\uAB30-\\uAB5A\\uAB5C-\\uAB69\\uAB70-\\uABE2\\uAC00-\\uD7A3\\uD7B0-\\uD7C6\\uD7CB-\\uD7FB\\uF900-\\uFA6D\\uFA70-\\uFAD9\\uFB00-\\uFB06\\uFB13-\\uFB17\\uFB1D\\uFB1F-\\uFB28\\uFB2A-\\uFB36\\uFB38-\\uFB3C\\uFB3E\\uFB40\\uFB41\\uFB43\\uFB44\\uFB46-\\uFBB1\\uFBD3-\\uFD3D\\uFD50-\\uFD8F\\uFD92-\\uFDC7\\uFDF0-\\uFDFB\\uFE70-\\uFE74\\uFE76-\\uFEFC\\uFF21-\\uFF3A\\uFF41-\\uFF5A\\uFF66-\\uFFBE\\uFFC2-\\uFFC7\\uFFCA-\\uFFCF\\uFFD2-\\uFFD7\\uFFDA-\\uFFDC]|\\uD800[\\uDC00-\\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+  
+  /**
+    https://www.ecma-international.org/ecma-262/5.1/#sec-7.6
+
+    IdentifierPart ::
+      IdentifierStart
+      UnicodeCombiningMark
+      UnicodeDigit
+      UnicodeConnectorPunctuation
+      <ZWNJ>
+      <ZWJ>
+  */
+  private static final Pattern JavascriptIdentifierPart = Pattern.compile("(?:[\\$0-9A-Z_a-z\\xAA\\xB5\\xB7\\xBA\\xC0-\\xD6\\xD8-\\xF6\\xF8-\\u02C1\\u02C6-\\u02D1\\u02E0-\\u02E4\\u02EC\\u02EE\\u0300-\\u0374\\u0376\\u0377\\u037A-\\u037D\\u037F\\u0386-\\u038A\\u038C\\u038E-\\u03A1\\u03A3-\\u03F5\\u03F7-\\u0481\\u0483-\\u0487\\u048A-\\u052F\\u0531-\\u0556\\u0559\\u0560-\\u0588\\u0591-\\u05BD\\u05BF\\u05C1\\u05C2\\u05C4\\u05C5\\u05C7\\u05D0-\\u05EA\\u05EF-\\u05F2\\u0610-\\u061A\\u0620-\\u0669\\u066E-\\u06D3\\u06D5-\\u06DC\\u06DF-\\u06E8\\u06EA-\\u06FC\\u06FF\\u0710-\\u074A\\u074D-\\u07B1\\u07C0-\\u07F5\\u07FA\\u07FD\\u0800-\\u082D\\u0840-\\u085B\\u0860-\\u086A\\u08A0-\\u08B4\\u08B6-\\u08C7\\u08D3-\\u08E1\\u08E3-\\u0963\\u0966-\\u096F\\u0971-\\u0983\\u0985-\\u098C\\u098F\\u0990\\u0993-\\u09A8\\u09AA-\\u09B0\\u09B2\\u09B6-\\u09B9\\u09BC-\\u09C4\\u09C7\\u09C8\\u09CB-\\u09CE\\u09D7\\u09DC\\u09DD\\u09DF-\\u09E3\\u09E6-\\u09F1\\u09FC\\u09FE\\u0A01-\\u0A03\\u0A05-\\u0A0A\\u0A0F\\u0A10\\u0A13-\\u0A28\\u0A2A-\\u0A30\\u0A32\\u0A33\\u0A35\\u0A36\\u0A38\\u0A39\\u0A3C\\u0A3E-\\u0A42\\u0A47\\u0A48\\u0A4B-\\u0A4D\\u0A51\\u0A59-\\u0A5C\\u0A5E\\u0A66-\\u0A75\\u0A81-\\u0A83\\u0A85-\\u0A8D\\u0A8F-\\u0A91\\u0A93-\\u0AA8\\u0AAA-\\u0AB0\\u0AB2\\u0AB3\\u0AB5-\\u0AB9\\u0ABC-\\u0AC5\\u0AC7-\\u0AC9\\u0ACB-\\u0ACD\\u0AD0\\u0AE0-\\u0AE3\\u0AE6-\\u0AEF\\u0AF9-\\u0AFF\\u0B01-\\u0B03\\u0B05-\\u0B0C\\u0B0F\\u0B10\\u0B13-\\u0B28\\u0B2A-\\u0B30\\u0B32\\u0B33\\u0B35-\\u0B39\\u0B3C-\\u0B44\\u0B47\\u0B48\\u0B4B-\\u0B4D\\u0B55-\\u0B57\\u0B5C\\u0B5D\\u0B5F-\\u0B63\\u0B66-\\u0B6F\\u0B71\\u0B82\\u0B83\\u0B85-\\u0B8A\\u0B8E-\\u0B90\\u0B92-\\u0B95\\u0B99\\u0B9A\\u0B9C\\u0B9E\\u0B9F\\u0BA3\\u0BA4\\u0BA8-\\u0BAA\\u0BAE-\\u0BB9\\u0BBE-\\u0BC2\\u0BC6-\\u0BC8\\u0BCA-\\u0BCD\\u0BD0\\u0BD7\\u0BE6-\\u0BEF\\u0C00-\\u0C0C\\u0C0E-\\u0C10\\u0C12-\\u0C28\\u0C2A-\\u0C39\\u0C3D-\\u0C44\\u0C46-\\u0C48\\u0C4A-\\u0C4D\\u0C55\\u0C56\\u0C58-\\u0C5A\\u0C60-\\u0C63\\u0C66-\\u0C6F\\u0C80-\\u0C83\\u0C85-\\u0C8C\\u0C8E-\\u0C90\\u0C92-\\u0CA8\\u0CAA-\\u0CB3\\u0CB5-\\u0CB9\\u0CBC-\\u0CC4\\u0CC6-\\u0CC8\\u0CCA-\\u0CCD\\u0CD5\\u0CD6\\u0CDE\\u0CE0-\\u0CE3\\u0CE6-\\u0CEF\\u0CF1\\u0CF2\\u0D00-\\u0D0C\\u0D0E-\\u0D10\\u0D12-\\u0D44\\u0D46-\\u0D48\\u0D4A-\\u0D4E\\u0D54-\\u0D57\\u0D5F-\\u0D63\\u0D66-\\u0D6F\\u0D7A-\\u0D7F\\u0D81-\\u0D83\\u0D85-\\u0D96\\u0D9A-\\u0DB1\\u0DB3-\\u0DBB\\u0DBD\\u0DC0-\\u0DC6\\u0DCA\\u0DCF-\\u0DD4\\u0DD6\\u0DD8-\\u0DDF\\u0DE6-\\u0DEF\\u0DF2\\u0DF3\\u0E01-\\u0E3A\\u0E40-\\u0E4E\\u0E50-\\u0E59\\u0E81\\u0E82\\u0E84\\u0E86-\\u0E8A\\u0E8C-\\u0EA3\\u0EA5\\u0EA7-\\u0EBD\\u0EC0-\\u0EC4\\u0EC6\\u0EC8-\\u0ECD\\u0ED0-\\u0ED9\\u0EDC-\\u0EDF\\u0F00\\u0F18\\u0F19\\u0F20-\\u0F29\\u0F35\\u0F37\\u0F39\\u0F3E-\\u0F47\\u0F49-\\u0F6C\\u0F71-\\u0F84\\u0F86-\\u0F97\\u0F99-\\u0FBC\\u0FC6\\u1000-\\u1049\\u1050-\\u109D\\u10A0-\\u10C5\\u10C7\\u10CD\\u10D0-\\u10FA\\u10FC-\\u1248\\u124A-\\u124D\\u1250-\\u1256\\u1258\\u125A-\\u125D\\u1260-\\u1288\\u128A-\\u128D\\u1290-\\u12B0\\u12B2-\\u12B5\\u12B8-\\u12BE\\u12C0\\u12C2-\\u12C5\\u12C8-\\u12D6\\u12D8-\\u1310\\u1312-\\u1315\\u1318-\\u135A\\u135D-\\u135F\\u1369-\\u1371\\u1380-\\u138F\\u13A0-\\u13F5\\u13F8-\\u13FD\\u1401-\\u166C\\u166F-\\u167F\\u1681-\\u169A\\u16A0-\\u16EA\\u16EE-\\u16F8\\u1700-\\u170C\\u170E-\\u1714\\u1720-\\u1734\\u1740-\\u1753\\u1760-\\u176C\\u176E-\\u1770\\u1772\\u1773\\u1780-\\u17D3\\u17D7\\u17DC\\u17DD\\u17E0-\\u17E9\\u180B-\\u180D\\u1810-\\u1819\\u1820-\\u1878\\u1880-\\u18AA\\u18B0-\\u18F5\\u1900-\\u191E\\u1920-\\u192B\\u1930-\\u193B\\u1946-\\u196D\\u1970-\\u1974\\u1980-\\u19AB\\u19B0-\\u19C9\\u19D0-\\u19DA\\u1A00-\\u1A1B\\u1A20-\\u1A5E\\u1A60-\\u1A7C\\u1A7F-\\u1A89\\u1A90-\\u1A99\\u1AA7\\u1AB0-\\u1ABD\\u1ABF\\u1AC0\\u1B00-\\u1B4B\\u1B50-\\u1B59\\u1B6B-\\u1B73\\u1B80-\\u1BF3\\u1C00-\\u1C37\\u1C40-\\u1C49\\u1C4D-\\u1C7D\\u1C80-\\u1C88\\u1C90-\\u1CBA\\u1CBD-\\u1CBF\\u1CD0-\\u1CD2\\u1CD4-\\u1CFA\\u1D00-\\u1DF9\\u1DFB-\\u1F15\\u1F18-\\u1F1D\\u1F20-\\u1F45\\u1F48-\\u1F4D\\u1F50-\\u1F57\\u1F59\\u1F5B\\u1F5D\\u1F5F-\\u1F7D\\u1F80-\\u1FB4\\u1FB6-\\u1FBC\\u1FBE\\u1FC2-\\u1FC4\\u1FC6-\\u1FCC\\u1FD0-\\u1FD3\\u1FD6-\\u1FDB\\u1FE0-\\u1FEC\\u1FF2-\\u1FF4\\u1FF6-\\u1FFC\\u200C\\u200D\\u203F\\u2040\\u2054\\u2071\\u207F\\u2090-\\u209C\\u20D0-\\u20DC\\u20E1\\u20E5-\\u20F0\\u2102\\u2107\\u210A-\\u2113\\u2115\\u2118-\\u211D\\u2124\\u2126\\u2128\\u212A-\\u2139\\u213C-\\u213F\\u2145-\\u2149\\u214E\\u2160-\\u2188\\u2C00-\\u2C2E\\u2C30-\\u2C5E\\u2C60-\\u2CE4\\u2CEB-\\u2CF3\\u2D00-\\u2D25\\u2D27\\u2D2D\\u2D30-\\u2D67\\u2D6F\\u2D7F-\\u2D96\\u2DA0-\\u2DA6\\u2DA8-\\u2DAE\\u2DB0-\\u2DB6\\u2DB8-\\u2DBE\\u2DC0-\\u2DC6\\u2DC8-\\u2DCE\\u2DD0-\\u2DD6\\u2DD8-\\u2DDE\\u2DE0-\\u2DFF\\u3005-\\u3007\\u3021-\\u302F\\u3031-\\u3035\\u3038-\\u303C\\u3041-\\u3096\\u3099-\\u309F\\u30A1-\\u30FA\\u30FC-\\u30FF\\u3105-\\u312F\\u3131-\\u318E\\u31A0-\\u31BF\\u31F0-\\u31FF\\u3400-\\u4DBF\\u4E00-\\u9FFC\\uA000-\\uA48C\\uA4D0-\\uA4FD\\uA500-\\uA60C\\uA610-\\uA62B\\uA640-\\uA66F\\uA674-\\uA67D\\uA67F-\\uA6F1\\uA717-\\uA71F\\uA722-\\uA788\\uA78B-\\uA7BF\\uA7C2-\\uA7CA\\uA7F5-\\uA827\\uA82C\\uA840-\\uA873\\uA880-\\uA8C5\\uA8D0-\\uA8D9\\uA8E0-\\uA8F7\\uA8FB\\uA8FD-\\uA92D\\uA930-\\uA953\\uA960-\\uA97C\\uA980-\\uA9C0\\uA9CF-\\uA9D9\\uA9E0-\\uA9FE\\uAA00-\\uAA36\\uAA40-\\uAA4D\\uAA50-\\uAA59\\uAA60-\\uAA76\\uAA7A-\\uAAC2\\uAADB-\\uAADD\\uAAE0-\\uAAEF\\uAAF2-\\uAAF6\\uAB01-\\uAB06\\uAB09-\\uAB0E\\uAB11-\\uAB16\\uAB20-\\uAB26\\uAB28-\\uAB2E\\uAB30-\\uAB5A\\uAB5C-\\uAB69\\uAB70-\\uABEA\\uABEC\\uABED\\uABF0-\\uABF9\\uAC00-\\uD7A3\\uD7B0-\\uD7C6\\uD7CB-\\uD7FB\\uF900-\\uFA6D\\uFA70-\\uFAD9\\uFB00-\\uFB06\\uFB13-\\uFB17\\uFB1D-\\uFB28\\uFB2A-\\uFB36\\uFB38-\\uFB3C\\uFB3E\\uFB40\\uFB41\\uFB43\\uFB44\\uFB46-\\uFBB1\\uFBD3-\\uFD3D\\uFD50-\\uFD8F\\uFD92-\\uFDC7\\uFDF0-\\uFDFB\\uFE00-\\uFE0F\\uFE20-\\uFE2F\\uFE33\\uFE34\\uFE4D-\\uFE4F\\uFE70-\\uFE74\\uFE76-\\uFEFC\\uFF10-\\uFF19\\uFF21-\\uFF3A\\uFF3F\\uFF41-\\uFF5A\\uFF66-\\uFFBE\\uFFC2-\\uFFC7\\uFFCA-\\uFFCF\\uFFD2-\\uFFD7\\uFFDA-\\uFFDC]|\\uD800[\\uDC00-\\uDC0B\\uDC0D-\\uDC26\\uDC28-\\uDC3A\\uDC3C\\uDC3D\\uDC3F-\\uDC4D\\uDC50-\\uDC5D\\uDC80-\\uDCFA\\uDD40-\\uDD74\\uDDFD\\uDE80-\\uDE9C\\uDEA0-\\uDED0\\uDEE0\\uDF00-\\uDF1F\\uDF2D-\\uDF4A\\uDF50-\\uDF7A\\uDF80-\\uDF9D\\uDFA0-\\uDFC3\\uDFC8-\\uDFCF\\uDFD1-\\uDFD5]|\\uD801[\\uDC00-\\uDC9D\\uDCA0-\\uDCA9\\uDCB0-\\uDCD3\\uDCD8-\\uDCFB\\uDD00-\\uDD27\\uDD30-\\uDD63\\uDE00-\\uDF36\\uDF40-\\uDF55\\uDF60-\\uDF67]|\\uD802[\\uDC00-\\uDC05\\uDC08\\uDC0A-\\uDC35\\uDC37\\uDC38\\uDC3C\\uDC3F-\\uDC55\\uDC60-\\uDC76\\uDC80-\\uDC9E\\uDCE0-\\uDCF2\\uDCF4\\uDCF5\\uDD00-\\uDD15\\uDD20-\\uDD39\\uDD80-\\uDDB7\\uDDBE\\uDDBF\\uDE00-\\uDE03\\uDE05\\uDE06\\uDE0C-\\uDE13\\uDE15-\\uDE17\\uDE19-\\uDE35\\uDE38-\\uDE3A\\uDE3F\\uDE60-\\uDE7C\\uDE80-\\uDE9C\\uDEC0-\\uDEC7\\uDEC9-\\uDEE6\\uDF00-\\uDF35\\uDF40-\\uDF55\\uDF60-\\uDF72\\uDF80-\\uDF91]|\\uD803[\\uDC00-\\uDC48\\uDC80-\\uDCB2\\uDCC0-\\uDCF2\\uDD00-\\uDD27\\uDD30-\\uDD39\\uDE80-\\uDEA9\\uDEAB\\uDEAC\\uDEB0\\uDEB1\\uDF00-\\uDF1C\\uDF27\\uDF30-\\uDF50\\uDFB0-\\uDFC4\\uDFE0-\\uDFF6]|\\uD804[\\uDC00-\\uDC46\\uDC66-\\uDC6F\\uDC7F-\\uDCBA\\uDCD0-\\uDCE8\\uDCF0-\\uDCF9\\uDD00-\\uDD34\\uDD36-\\uDD3F\\uDD44-\\uDD47\\uDD50-\\uDD73\\uDD76\\uDD80-\\uDDC4\\uDDC9-\\uDDCC\\uDDCE-\\uDDDA\\uDDDC\\uDE00-\\uDE11\\uDE13-\\uDE37\\uDE3E\\uDE80-\\uDE86\\uDE88\\uDE8A-\\uDE8D\\uDE8F-\\uDE9D\\uDE9F-\\uDEA8\\uDEB0-\\uDEEA\\uDEF0-\\uDEF9\\uDF00-\\uDF03\\uDF05-\\uDF0C\\uDF0F\\uDF10\\uDF13-\\uDF28\\uDF2A-\\uDF30\\uDF32\\uDF33\\uDF35-\\uDF39\\uDF3B-\\uDF44\\uDF47\\uDF48\\uDF4B-\\uDF4D\\uDF50\\uDF57\\uDF5D-\\uDF63\\uDF66-\\uDF6C\\uDF70-\\uDF74]|\\uD805[\\uDC00-\\uDC4A\\uDC50-\\uDC59\\uDC5E-\\uDC61\\uDC80-\\uDCC5\\uDCC7\\uDCD0-\\uDCD9\\uDD80-\\uDDB5\\uDDB8-\\uDDC0\\uDDD8-\\uDDDD\\uDE00-\\uDE40\\uDE44\\uDE50-\\uDE59\\uDE80-\\uDEB8\\uDEC0-\\uDEC9\\uDF00-\\uDF1A\\uDF1D-\\uDF2B\\uDF30-\\uDF39]|\\uD806[\\uDC00-\\uDC3A\\uDCA0-\\uDCE9\\uDCFF-\\uDD06\\uDD09\\uDD0C-\\uDD13\\uDD15\\uDD16\\uDD18-\\uDD35\\uDD37\\uDD38\\uDD3B-\\uDD43\\uDD50-\\uDD59\\uDDA0-\\uDDA7\\uDDAA-\\uDDD7\\uDDDA-\\uDDE1\\uDDE3\\uDDE4\\uDE00-\\uDE3E\\uDE47\\uDE50-\\uDE99\\uDE9D\\uDEC0-\\uDEF8]|\\uD807[\\uDC00-\\uDC08\\uDC0A-\\uDC36\\uDC38-\\uDC40\\uDC50-\\uDC59\\uDC72-\\uDC8F\\uDC92-\\uDCA7\\uDCA9-\\uDCB6\\uDD00-\\uDD06\\uDD08\\uDD09\\uDD0B-\\uDD36\\uDD3A\\uDD3C\\uDD3D\\uDD3F-\\uDD47\\uDD50-\\uDD59\\uDD60-\\uDD65\\uDD67\\uDD68\\uDD6A-\\uDD8E\\uDD90\\uDD91\\uDD93-\\uDD98\\uDDA0-\\uDDA9\\uDEE0-\\uDEF6\\uDFB0]|\\uD808[\\uDC00-\\uDF99]|\\uD809[\\uDC00-\\uDC6E\\uDC80-\\uDD43]|[\\uD80C\\uD81C-\\uD820\\uD822\\uD840-\\uD868\\uD86A-\\uD86C\\uD86F-\\uD872\\uD874-\\uD879\\uD880-\\uD883][\\uDC00-\\uDFFF]|\\uD80D[\\uDC00-\\uDC2E]|\\uD811[\\uDC00-\\uDE46]|\\uD81A[\\uDC00-\\uDE38\\uDE40-\\uDE5E\\uDE60-\\uDE69\\uDED0-\\uDEED\\uDEF0-\\uDEF4\\uDF00-\\uDF36\\uDF40-\\uDF43\\uDF50-\\uDF59\\uDF63-\\uDF77\\uDF7D-\\uDF8F]|\\uD81B[\\uDE40-\\uDE7F\\uDF00-\\uDF4A\\uDF4F-\\uDF87\\uDF8F-\\uDF9F\\uDFE0\\uDFE1\\uDFE3\\uDFE4\\uDFF0\\uDFF1]|\\uD821[\\uDC00-\\uDFF7]|\\uD823[\\uDC00-\\uDCD5\\uDD00-\\uDD08]|\\uD82C[\\uDC00-\\uDD1E\\uDD50-\\uDD52\\uDD64-\\uDD67\\uDD70-\\uDEFB]|\\uD82F[\\uDC00-\\uDC6A\\uDC70-\\uDC7C\\uDC80-\\uDC88\\uDC90-\\uDC99\\uDC9D\\uDC9E]|\\uD834[\\uDD65-\\uDD69\\uDD6D-\\uDD72\\uDD7B-\\uDD82\\uDD85-\\uDD8B\\uDDAA-\\uDDAD\\uDE42-\\uDE44]|\\uD835[\\uDC00-\\uDC54\\uDC56-\\uDC9C\\uDC9E\\uDC9F\\uDCA2\\uDCA5\\uDCA6\\uDCA9-\\uDCAC\\uDCAE-\\uDCB9\\uDCBB\\uDCBD-\\uDCC3\\uDCC5-\\uDD05\\uDD07-\\uDD0A\\uDD0D-\\uDD14\\uDD16-\\uDD1C\\uDD1E-\\uDD39\\uDD3B-\\uDD3E\\uDD40-\\uDD44\\uDD46\\uDD4A-\\uDD50\\uDD52-\\uDEA5\\uDEA8-\\uDEC0\\uDEC2-\\uDEDA\\uDEDC-\\uDEFA\\uDEFC-\\uDF14\\uDF16-\\uDF34\\uDF36-\\uDF4E\\uDF50-\\uDF6E\\uDF70-\\uDF88\\uDF8A-\\uDFA8\\uDFAA-\\uDFC2\\uDFC4-\\uDFCB\\uDFCE-\\uDFFF]|\\uD836[\\uDE00-\\uDE36\\uDE3B-\\uDE6C\\uDE75\\uDE84\\uDE9B-\\uDE9F\\uDEA1-\\uDEAF]|\\uD838[\\uDC00-\\uDC06\\uDC08-\\uDC18\\uDC1B-\\uDC21\\uDC23\\uDC24\\uDC26-\\uDC2A\\uDD00-\\uDD2C\\uDD30-\\uDD3D\\uDD40-\\uDD49\\uDD4E\\uDEC0-\\uDEF9]|\\uD83A[\\uDC00-\\uDCC4\\uDCD0-\\uDCD6\\uDD00-\\uDD4B\\uDD50-\\uDD59]|\\uD83B[\\uDE00-\\uDE03\\uDE05-\\uDE1F\\uDE21\\uDE22\\uDE24\\uDE27\\uDE29-\\uDE32\\uDE34-\\uDE37\\uDE39\\uDE3B\\uDE42\\uDE47\\uDE49\\uDE4B\\uDE4D-\\uDE4F\\uDE51\\uDE52\\uDE54\\uDE57\\uDE59\\uDE5B\\uDE5D\\uDE5F\\uDE61\\uDE62\\uDE64\\uDE67-\\uDE6A\\uDE6C-\\uDE72\\uDE74-\\uDE77\\uDE79-\\uDE7C\\uDE7E\\uDE80-\\uDE89\\uDE8B-\\uDE9B\\uDEA1-\\uDEA3\\uDEA5-\\uDEA9\\uDEAB-\\uDEBB]|\\uD83E[\\uDFF0-\\uDFF9]|\\uD869[\\uDC00-\\uDEDD\\uDF00-\\uDFFF]|\\uD86D[\\uDC00-\\uDF34\\uDF40-\\uDFFF]|\\uD86E[\\uDC00-\\uDC1D\\uDC20-\\uDFFF]|\\uD873[\\uDC00-\\uDEA1\\uDEB0-\\uDFFF]|\\uD87A[\\uDC00-\\uDFE0]|\\uD87E[\\uDC00-\\uDE1D]|\\uD884[\\uDC00-\\uDF4A]|\\uDB40[\\uDD00-\\uDDEF])");
+}
\ No newline at end of file
diff --git a/travis_util/test_npm.sh b/travis_util/test_npm.sh
index 75fb58f003d..5edd28b35bb 100755
--- a/travis_util/test_npm.sh
+++ b/travis_util/test_npm.sh
@@ -1,5 +1,9 @@
 #!/bin/bash
 
+if [ -z $TRAVIS_BUILD_DIR ]; then
+  TRAVIS_BUILD_DIR=`pwd`
+fi
+
 # Run yarn install so that dev dependencies are available
 yarn install && cd ${TRAVIS_BUILD_DIR}/node_modules/closure-compiler-npm && yarn install
 
diff --git a/utils/build.sh b/utils/build.sh
index b3a8b6739f1..9fdbc64ca32 100755
--- a/utils/build.sh
+++ b/utils/build.sh
@@ -1,3 +1,3 @@
 #!/bin/bash
 # Build the compiler without GWT.
-mvn -DskipTests -pl externs/pom.xml,pom-main.xml,pom-main-shaded.xml
+mvn -DskipTests -pl externs/pom.xml,pom-main.xml,pom-main-shaded.xml -e

From 0d25c894493ef7226adab5897b9b618ec6b4cbc7 Mon Sep 17 00:00:00 2001
From: Christian Lewis <ctjl96@gmail.com>
Date: Mon, 20 Jul 2020 20:33:25 -0500
Subject: [PATCH 09/28] Added .vscode to .gitignore.

---
 .gitignore | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/.gitignore b/.gitignore
index 70c53e60ad3..fa7f61dd0f3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -17,4 +17,7 @@ target/
 /bazel-bin
 /bazel-closure-compiler
 /bazel-out
-/bazel-testlogs
\ No newline at end of file
+/bazel-testlogs
+
+# IDE
+.vscode
\ No newline at end of file

From f2f02e378f9e390d4868ec356b3e2fbd7eadf6ec Mon Sep 17 00:00:00 2001
From: Christian Lewis <ctjl96@gmail.com>
Date: Mon, 20 Jul 2020 20:33:55 -0500
Subject: [PATCH 10/28] Added note about regexpu.

---
 .../javascript/jscomp/parsing/parser/util/UnicodeMatch.java    | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java b/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
index 0cdcac5107c..cd7ebd62b76 100644
--- a/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
+++ b/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
@@ -23,6 +23,9 @@
  * with ECMAScript spec. Retains old optimizations for commonly-used characters,
  * namely ASCII and Latin/Greek charsets. Uses regex for remaining characters
  * (which would throw errors otherwise).
+ * 
+ * Unicode category patterns with /u flag compiled to vanilla regex with
+ * regexpu: https://github.com/mathiasbynens/regexpu
  */
 public class UnicodeMatch {
   // Intentional to minimize branches in this code

From a8e9e955165c1794af1539fa6083bbe23c1dd54d Mon Sep 17 00:00:00 2001
From: Christian Lewis <ctjl96@gmail.com>
Date: Mon, 20 Jul 2020 20:34:56 -0500
Subject: [PATCH 11/28] Fixed test re. U+FF3F, which is now supported.

---
 .../jscomp/deps/ClosureBundlerTest.java       | 25 +++----------------
 1 file changed, 3 insertions(+), 22 deletions(-)

diff --git a/test/com/google/javascript/jscomp/deps/ClosureBundlerTest.java b/test/com/google/javascript/jscomp/deps/ClosureBundlerTest.java
index f40d6e5c5e3..2c605af29b4 100644
--- a/test/com/google/javascript/jscomp/deps/ClosureBundlerTest.java
+++ b/test/com/google/javascript/jscomp/deps/ClosureBundlerTest.java
@@ -210,8 +210,7 @@ public void testCommentsAndFormattingRemovedWithTranspilation() throws Exception
   }
 
   @Test
-  public void testFullWidthLowLineWithDefaultTranspilerIsOkay() throws Exception {
-    // The last character is something the compiler doesn't handle correctly
+  public void testFullWidthLowLine() throws Exception {
     String input = "var ａｅｓｔｈｅｔｉｃ＿";
     ClosureBundler bundler = new ClosureBundler();
     StringBuilder sb = new StringBuilder();
@@ -219,24 +218,6 @@ public void testFullWidthLowLineWithDefaultTranspilerIsOkay() throws Exception {
         sb,
         SimpleDependencyInfo.builder("", "").build(),
         input);
-    assertThat(sb.toString()).isEqualTo(input);
-  }
-
-  // TODO(johnplaisted): If / when the compiler can parse full width low line in identifiers
-  // this should be okay to be transpiled.
-  @Test
-  public void testFullWidthLowLineInTranspiledCodeIsError() throws Exception {
-    // The last character is something the compiler doesn't handle correctly
-    String input = "let ａｅｓｔｈｅｔｉｃ＿";
-    ClosureBundler bundler = new ClosureBundler(BaseTranspiler.ES5_TRANSPILER);
-    StringBuilder sb = new StringBuilder();
-    try {
-      bundler.appendTo(sb, SimpleDependencyInfo.builder("", "").build(), input);
-      assertWithMessage("Expected an exception").fail();
-    } catch (TranspilationException e) {
-      assertThat(e)
-          .hasMessageThat()
-          .contains("Parse error. Character '＿' (U+FF3F) is not a valid identifier start char");
-    }
+    assertThat(sb.toString()).isEqualTo("var \uff41\uff45\uff53\uff54\uff48\uff45\uff54\uff49\uff43\uff3f");
   }
-}
+}
\ No newline at end of file

From 813797bc80e1998dca7ce8440906b887fd4cd711 Mon Sep 17 00:00:00 2001
From: Christian Lewis <ctjl96@gmail.com>
Date: Tue, 21 Jul 2020 02:27:11 -0500
Subject: [PATCH 12/28] Added more notes on regex patterns used.

---
 .../jscomp/parsing/parser/util/UnicodeMatch.java           | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java b/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
index cd7ebd62b76..d3f3493ab7b 100644
--- a/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
+++ b/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
@@ -26,6 +26,13 @@
  * 
  * Unicode category patterns with /u flag compiled to vanilla regex with
  * regexpu: https://github.com/mathiasbynens/regexpu
+ * 
+ * IdentifierStart and IdentifierPart regex patterns based on ECMA's
+ * documentation:
+ * https://github.com/tc39/proposal-regexp-unicode-property-escapes#other-examples
+ * 
+ * const regexIdentifierStart = /[$_\p{ID_Start}]/u;
+ * const regexIdentifierPart = /[$_\u200C\u200D\p{ID_Continue}]/u;
  */
 public class UnicodeMatch {
   // Intentional to minimize branches in this code

From 8fefd7d18f011fb40bc983baf6724472baf85eaa Mon Sep 17 00:00:00 2001
From: Christian Lewis <ctjl96@gmail.com>
Date: Wed, 12 Aug 2020 14:37:53 -0500
Subject: [PATCH 13/28] Inlined calls to UnicodeMatch utils.

---
 .../jscomp/parsing/parser/Scanner.java        | 22 ++++---------------
 .../parsing/parser/util/UnicodeMatch.java     |  4 +++-
 2 files changed, 7 insertions(+), 19 deletions(-)

diff --git a/src/com/google/javascript/jscomp/parsing/parser/Scanner.java b/src/com/google/javascript/jscomp/parsing/parser/Scanner.java
index e6c9d6c4732..59150eb61fb 100644
--- a/src/com/google/javascript/jscomp/parsing/parser/Scanner.java
+++ b/src/com/google/javascript/jscomp/parsing/parser/Scanner.java
@@ -141,7 +141,7 @@ public LiteralToken nextRegularExpressionLiteralToken() {
     nextChar();
 
     // flags
-    while (isIdentifierPart(peekChar())) {
+    while (UnicodeMatch.isJavascriptIdentifierPart(peekChar())) {
       nextChar();
     }
 
@@ -765,7 +765,7 @@ private Token scanIdentifierOrKeyword(int beginToken, char ch) {
     int unicodeEscapeLen = containsUnicodeEscape ? 1 : 0;
 
     ch = peekChar();
-    while (isIdentifierPart(ch)
+    while (UnicodeMatch.isJavascriptIdentifierPart(ch)
         || ch == '\\'
         || (ch == '{' && unicodeEscapeLen == 2)
         || (ch == '}' && bracedUnicodeEscape)) {
@@ -805,7 +805,7 @@ private Token scanIdentifierOrKeyword(int beginToken, char ch) {
     // Check to make sure the first character (or the unicode escape at the
     // beginning of the identifier) is a valid identifier start character.
     char start = value.charAt(0);
-    if (!isIdentifierStart(start)) {
+    if (!UnicodeMatch.isJavascriptIdentifierStart(start)) {
       reportError(
           getPosition(beginToken),
           "Character '%c' (U+%04X) is not a valid identifier start char",
@@ -859,7 +859,7 @@ private static String processUnicodeEscapes(String value) {
         }
         // TODO(mattloring): Allow code points >= 0xFFFF (greater than the size of a char).
         char ch = (char) Integer.parseInt(hexDigits, 0x10);
-        if (!isIdentifierPart(ch)) {
+        if (!UnicodeMatch.isJavascriptIdentifierPart(ch)) {
           return null;
         }
         value = value.substring(0, escapeStart) + ch + value.substring(escapeEnd);
@@ -870,20 +870,6 @@ private static String processUnicodeEscapes(String value) {
     return value;
   }
 
-  /**
-   * Interface from UnicodeRegex. Includes old optimizations.
-   */
-  private static boolean isIdentifierStart(char ch) {
-    return UnicodeMatch.isJavascriptIdentifierStart(ch);
-  }
-  
-  /**
-   * Interface from UnicodeRegex. Includes old optimizations.
-   */
-  private static boolean isIdentifierPart(char ch) {
-    return UnicodeMatch.isJavascriptIdentifierPart(ch);
-  }
-
   private Token scanStringLiteral(int beginIndex, char terminator) {
     // String literals might span multiple lines.
     SourcePosition startingPosition = getPosition(beginIndex);
diff --git a/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java b/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
index d3f3493ab7b..7f18752546a 100644
--- a/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
+++ b/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
@@ -34,7 +34,9 @@
  * const regexIdentifierStart = /[$_\p{ID_Start}]/u;
  * const regexIdentifierPart = /[$_\u200C\u200D\p{ID_Continue}]/u;
  */
-public class UnicodeMatch {
+private class UnicodeMatch {
+  private UnicodeMatch() {}
+  
   // Intentional to minimize branches in this code
   @SuppressWarnings("ShortCircuitBoolean")
   private static boolean fastPathLetters(char ch) {

From 78700f2645b9edde52f2ec809ca0f5182738caee Mon Sep 17 00:00:00 2001
From: Christian Lewis <ctjl96@gmail.com>
Date: Wed, 12 Aug 2020 15:03:01 -0500
Subject: [PATCH 14/28] UnicodeMatch to public class, prevent build failure

---
 .../javascript/jscomp/parsing/parser/Scanner.java    |  2 ++
 .../jscomp/parsing/parser/util/UnicodeMatch.java     | 12 ++++++------
 2 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/src/com/google/javascript/jscomp/parsing/parser/Scanner.java b/src/com/google/javascript/jscomp/parsing/parser/Scanner.java
index 59150eb61fb..6b12142e95b 100644
--- a/src/com/google/javascript/jscomp/parsing/parser/Scanner.java
+++ b/src/com/google/javascript/jscomp/parsing/parser/Scanner.java
@@ -22,7 +22,9 @@
 import com.google.javascript.jscomp.parsing.parser.util.ErrorReporter;
 import com.google.javascript.jscomp.parsing.parser.util.SourcePosition;
 import com.google.javascript.jscomp.parsing.parser.util.SourceRange;
+
 import com.google.javascript.jscomp.parsing.parser.util.UnicodeMatch;
+
 import java.util.ArrayList;
 import javax.annotation.Nullable;
 
diff --git a/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java b/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
index 7f18752546a..ae553453e40 100644
--- a/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
+++ b/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
@@ -34,12 +34,12 @@
  * const regexIdentifierStart = /[$_\p{ID_Start}]/u;
  * const regexIdentifierPart = /[$_\u200C\u200D\p{ID_Continue}]/u;
  */
-private class UnicodeMatch {
+public final class UnicodeMatch {
   private UnicodeMatch() {}
-  
+
   // Intentional to minimize branches in this code
   @SuppressWarnings("ShortCircuitBoolean")
-  private static boolean fastPathLetters(char ch) {
+  private static final boolean fastPathLetters(char ch) {
     return (
       // ASCII
       ('A' <= ch & ch <= 'Z') |
@@ -64,18 +64,18 @@ private static boolean fastPathLetters(char ch) {
 
   // Intentional to minimize branches in this code
   @SuppressWarnings("ShortCircuitBoolean")
-  private static boolean fastPathDigits(char ch) {
+  private static final boolean fastPathDigits(char ch) {
     return '0' <= ch & ch <= '9';
   }
 
-  public static boolean isJavascriptIdentifierStart(char ch) {
+  public static final boolean isJavascriptIdentifierStart(char ch) {
     return fastPathLetters(ch)
         || JavascriptIdentifierStart
               .matcher(Character.toString(ch))
               .matches();
   }
 
-  public static boolean isJavascriptIdentifierPart(char ch) {
+  public static final boolean isJavascriptIdentifierPart(char ch) {
     return (fastPathLetters(ch) | fastPathDigits(ch))
         || JavascriptIdentifierPart
               .matcher(Character.toString(ch))

From ad71a905084a03fbc82fbc49ac58d68c11efe29c Mon Sep 17 00:00:00 2001
From: Christian Lewis <ctjl96@gmail.com>
Date: Wed, 12 Aug 2020 15:13:53 -0500
Subject: [PATCH 15/28] Changed isIdentifierPart and isIdentifierStart arg
 types from char to int

---
 .../jscomp/parsing/parser/util/UnicodeMatch.java          | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java b/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
index ae553453e40..f220cfdced9 100644
--- a/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
+++ b/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
@@ -39,7 +39,7 @@ private UnicodeMatch() {}
 
   // Intentional to minimize branches in this code
   @SuppressWarnings("ShortCircuitBoolean")
-  private static final boolean fastPathLetters(char ch) {
+  private static final boolean fastPathLetters(int ch) {
     return (
       // ASCII
       ('A' <= ch & ch <= 'Z') |
@@ -64,18 +64,18 @@ private static final boolean fastPathLetters(char ch) {
 
   // Intentional to minimize branches in this code
   @SuppressWarnings("ShortCircuitBoolean")
-  private static final boolean fastPathDigits(char ch) {
+  private static final boolean fastPathDigits(int ch) {
     return '0' <= ch & ch <= '9';
   }
 
-  public static final boolean isJavascriptIdentifierStart(char ch) {
+  public static final boolean isJavascriptIdentifierStart(int ch) {
     return fastPathLetters(ch)
         || JavascriptIdentifierStart
               .matcher(Character.toString(ch))
               .matches();
   }
 
-  public static final boolean isJavascriptIdentifierPart(char ch) {
+  public static final boolean isJavascriptIdentifierPart(int ch) {
     return (fastPathLetters(ch) | fastPathDigits(ch))
         || JavascriptIdentifierPart
               .matcher(Character.toString(ch))

From 43722128026e304024e8b82347cc7735f69ed11a Mon Sep 17 00:00:00 2001
From: Christian Lewis <ctjl96@gmail.com>
Date: Wed, 12 Aug 2020 15:52:29 -0500
Subject: [PATCH 16/28] Added comment about branch prediction misses

---
 .../javascript/jscomp/parsing/parser/util/UnicodeMatch.java  | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java b/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
index f220cfdced9..8f07df01ba8 100644
--- a/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
+++ b/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
@@ -37,7 +37,10 @@
 public final class UnicodeMatch {
   private UnicodeMatch() {}
 
-  // Intentional to minimize branches in this code
+  /**
+   * Intentionally avoiding short circuiting behavior of "||" and "&&". This
+   * minimizes branches in this code which minimizes branch prediction misses.
+   */
   @SuppressWarnings("ShortCircuitBoolean")
   private static final boolean fastPathLetters(int ch) {
     return (

From 066eabaa8afe30ec99c2168ce61292932fbf79ae Mon Sep 17 00:00:00 2001
From: Christian Lewis <ctjl96@gmail.com>
Date: Wed, 12 Aug 2020 16:05:20 -0500
Subject: [PATCH 17/28] Clarified comments and added `fastPathAscii`

---
 .../parsing/parser/util/UnicodeMatch.java     | 45 ++++++++++---------
 1 file changed, 25 insertions(+), 20 deletions(-)

diff --git a/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java b/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
index 8f07df01ba8..20362b56b80 100644
--- a/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
+++ b/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
@@ -38,48 +38,53 @@ public final class UnicodeMatch {
   private UnicodeMatch() {}
 
   /**
+   * Check if a given character is an ASCII character. For performance
+   * optimization.
+   */
+  private static final boolean fastPathAscii(int ch) {
+    return ch <= 127;
+  }
+
+  /**
+   * Check if a given character is an ASCII letter. This fast path is broken
+   * into two parts because of the logical differences in `IdentifierPart` and
+   * `IdentifierStart`, where the latter does not accept a digit.
+   *
    * Intentionally avoiding short circuiting behavior of "||" and "&&". This
    * minimizes branches in this code which minimizes branch prediction misses.
    */
   @SuppressWarnings("ShortCircuitBoolean")
   private static final boolean fastPathLetters(int ch) {
     return (
-      // ASCII
       ('A' <= ch & ch <= 'Z') |
-      ('a' <= ch & ch <= 'z') |
-      (ch == '_' | ch == '$') |
-      // Latin letters
-      (0x00C0 <= ch & ch <= 0x00D6) |
-      // Latin letters
-      (0x00D8 <= ch & ch <= 0x00F6) |
-      // Latin letters
-      (0x00F8 <= ch & ch <= 0x00FF) |
-      // Latin Barred O
-      (ch == 0x0275) |
-      // Greek uppercase letters
-      (0x0391 <= ch & ch <= 0x03A1) |
-      // Remaining Greek uppercase letters
-      (0x03A3 <= ch & ch <= 0x03A9) |
-      // Greek lowercase letters
-      (0x03B1 <= ch & ch <= 0x03C9)
+      ('a' <= ch & ch <= 'z')
     );
   }
 
-  // Intentional to minimize branches in this code
+  /**
+   * Check if a given character is an ASCII digit. This fast path is broken into
+   * two parts because of the logical differences in `IdentifierPart` and
+   * `IdentifierStart`, where the latter does not accept a digit.
+   *
+   * Intentionally avoiding short circuiting behavior of "||" and "&&". This
+   * minimizes branches in this code which minimizes branch prediction misses.
+   */
   @SuppressWarnings("ShortCircuitBoolean")
   private static final boolean fastPathDigits(int ch) {
     return '0' <= ch & ch <= '9';
   }
 
   public static final boolean isJavascriptIdentifierStart(int ch) {
-    return fastPathLetters(ch)
+    return fastPathAscii(ch) 
+        || fastPathLetters(ch)
         || JavascriptIdentifierStart
               .matcher(Character.toString(ch))
               .matches();
   }
 
   public static final boolean isJavascriptIdentifierPart(int ch) {
-    return (fastPathLetters(ch) | fastPathDigits(ch))
+    return fastPathAscii(ch)
+        || (fastPathLetters(ch) | fastPathDigits(ch))
         || JavascriptIdentifierPart
               .matcher(Character.toString(ch))
               .matches();

From 8c7c040e79e58a7ddaae2e0dee1854562f947dee Mon Sep 17 00:00:00 2001
From: Christian Lewis <ctjl96@gmail.com>
Date: Wed, 12 Aug 2020 16:36:28 -0500
Subject: [PATCH 18/28] Re-added fastPath Greek/Latin checks until further
 advisement

---
 .../parsing/parser/util/UnicodeMatch.java     | 56 ++++++++++++-------
 1 file changed, 35 insertions(+), 21 deletions(-)

diff --git a/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java b/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
index 20362b56b80..a75ad4eb334 100644
--- a/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
+++ b/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
@@ -57,7 +57,21 @@ private static final boolean fastPathAscii(int ch) {
   private static final boolean fastPathLetters(int ch) {
     return (
       ('A' <= ch & ch <= 'Z') |
-      ('a' <= ch & ch <= 'z')
+      ('a' <= ch & ch <= 'z') |
+      // Latin letters
+      (0x00C0 <= ch & ch <= 0x00D6) |
+      // Latin letters
+      (0x00D8 <= ch & ch <= 0x00F6) |
+      // Latin letters
+      (0x00F8 <= ch & ch <= 0x00FF) |
+      // Latin Barred O
+      (ch == 0x0275) |
+      // Greek uppercase letters
+      (0x0391 <= ch & ch <= 0x03A1) |
+      // Remaining Greek uppercase letters
+      (0x03A3 <= ch & ch <= 0x03A9) |
+      // Greek lowercase letters
+      (0x03B1 <= ch & ch <= 0x03C9)
     );
   }
 
@@ -74,33 +88,23 @@ private static final boolean fastPathDigits(int ch) {
     return '0' <= ch & ch <= '9';
   }
 
-  public static final boolean isJavascriptIdentifierStart(int ch) {
-    return fastPathAscii(ch) 
-        || fastPathLetters(ch)
-        || JavascriptIdentifierStart
-              .matcher(Character.toString(ch))
-              .matches();
-  }
-
-  public static final boolean isJavascriptIdentifierPart(int ch) {
-    return fastPathAscii(ch)
-        || (fastPathLetters(ch) | fastPathDigits(ch))
-        || JavascriptIdentifierPart
-              .matcher(Character.toString(ch))
-              .matches();
-  }
-
   /**
     https://www.ecma-international.org/ecma-262/5.1/#sec-7.6
     
     IdentifierStart ::
-      UnicodeLetter: isUnicodeLetter()
+      UnicodeLetter
       $: Character == '$'
       _: Character == '_'
-      \ UnicodeEscapeSequence: isEscapeSequence()
+      \ UnicodeEscapeSequence
   */
-  private static final Pattern JavascriptIdentifierStart = Pattern.compile("(?:[\\$A-Z_a-z\\xAA\\xB5\\xBA\\xC0-\\xD6\\xD8-\\xF6\\xF8-\\u02C1\\u02C6-\\u02D1\\u02E0-\\u02E4\\u02EC\\u02EE\\u0370-\\u0374\\u0376\\u0377\\u037A-\\u037D\\u037F\\u0386\\u0388-\\u038A\\u038C\\u038E-\\u03A1\\u03A3-\\u03F5\\u03F7-\\u0481\\u048A-\\u052F\\u0531-\\u0556\\u0559\\u0560-\\u0588\\u05D0-\\u05EA\\u05EF-\\u05F2\\u0620-\\u064A\\u066E\\u066F\\u0671-\\u06D3\\u06D5\\u06E5\\u06E6\\u06EE\\u06EF\\u06FA-\\u06FC\\u06FF\\u0710\\u0712-\\u072F\\u074D-\\u07A5\\u07B1\\u07CA-\\u07EA\\u07F4\\u07F5\\u07FA\\u0800-\\u0815\\u081A\\u0824\\u0828\\u0840-\\u0858\\u0860-\\u086A\\u08A0-\\u08B4\\u08B6-\\u08C7\\u0904-\\u0939\\u093D\\u0950\\u0958-\\u0961\\u0971-\\u0980\\u0985-\\u098C\\u098F\\u0990\\u0993-\\u09A8\\u09AA-\\u09B0\\u09B2\\u09B6-\\u09B9\\u09BD\\u09CE\\u09DC\\u09DD\\u09DF-\\u09E1\\u09F0\\u09F1\\u09FC\\u0A05-\\u0A0A\\u0A0F\\u0A10\\u0A13-\\u0A28\\u0A2A-\\u0A30\\u0A32\\u0A33\\u0A35\\u0A36\\u0A38\\u0A39\\u0A59-\\u0A5C\\u0A5E\\u0A72-\\u0A74\\u0A85-\\u0A8D\\u0A8F-\\u0A91\\u0A93-\\u0AA8\\u0AAA-\\u0AB0\\u0AB2\\u0AB3\\u0AB5-\\u0AB9\\u0ABD\\u0AD0\\u0AE0\\u0AE1\\u0AF9\\u0B05-\\u0B0C\\u0B0F\\u0B10\\u0B13-\\u0B28\\u0B2A-\\u0B30\\u0B32\\u0B33\\u0B35-\\u0B39\\u0B3D\\u0B5C\\u0B5D\\u0B5F-\\u0B61\\u0B71\\u0B83\\u0B85-\\u0B8A\\u0B8E-\\u0B90\\u0B92-\\u0B95\\u0B99\\u0B9A\\u0B9C\\u0B9E\\u0B9F\\u0BA3\\u0BA4\\u0BA8-\\u0BAA\\u0BAE-\\u0BB9\\u0BD0\\u0C05-\\u0C0C\\u0C0E-\\u0C10\\u0C12-\\u0C28\\u0C2A-\\u0C39\\u0C3D\\u0C58-\\u0C5A\\u0C60\\u0C61\\u0C80\\u0C85-\\u0C8C\\u0C8E-\\u0C90\\u0C92-\\u0CA8\\u0CAA-\\u0CB3\\u0CB5-\\u0CB9\\u0CBD\\u0CDE\\u0CE0\\u0CE1\\u0CF1\\u0CF2\\u0D04-\\u0D0C\\u0D0E-\\u0D10\\u0D12-\\u0D3A\\u0D3D\\u0D4E\\u0D54-\\u0D56\\u0D5F-\\u0D61\\u0D7A-\\u0D7F\\u0D85-\\u0D96\\u0D9A-\\u0DB1\\u0DB3-\\u0DBB\\u0DBD\\u0DC0-\\u0DC6\\u0E01-\\u0E30\\u0E32\\u0E33\\u0E40-\\u0E46\\u0E81\\u0E82\\u0E84\\u0E86-\\u0E8A\\u0E8C-\\u0EA3\\u0EA5\\u0EA7-\\u0EB0\\u0EB2\\u0EB3\\u0EBD\\u0EC0-\\u0EC4\\u0EC6\\u0EDC-\\u0EDF\\u0F00\\u0F40-\\u0F47\\u0F49-\\u0F6C\\u0F88-\\u0F8C\\u1000-\\u102A\\u103F\\u1050-\\u1055\\u105A-\\u105D\\u1061\\u1065\\u1066\\u106E-\\u1070\\u1075-\\u1081\\u108E\\u10A0-\\u10C5\\u10C7\\u10CD\\u10D0-\\u10FA\\u10FC-\\u1248\\u124A-\\u124D\\u1250-\\u1256\\u1258\\u125A-\\u125D\\u1260-\\u1288\\u128A-\\u128D\\u1290-\\u12B0\\u12B2-\\u12B5\\u12B8-\\u12BE\\u12C0\\u12C2-\\u12C5\\u12C8-\\u12D6\\u12D8-\\u1310\\u1312-\\u1315\\u1318-\\u135A\\u1380-\\u138F\\u13A0-\\u13F5\\u13F8-\\u13FD\\u1401-\\u166C\\u166F-\\u167F\\u1681-\\u169A\\u16A0-\\u16EA\\u16EE-\\u16F8\\u1700-\\u170C\\u170E-\\u1711\\u1720-\\u1731\\u1740-\\u1751\\u1760-\\u176C\\u176E-\\u1770\\u1780-\\u17B3\\u17D7\\u17DC\\u1820-\\u1878\\u1880-\\u18A8\\u18AA\\u18B0-\\u18F5\\u1900-\\u191E\\u1950-\\u196D\\u1970-\\u1974\\u1980-\\u19AB\\u19B0-\\u19C9\\u1A00-\\u1A16\\u1A20-\\u1A54\\u1AA7\\u1B05-\\u1B33\\u1B45-\\u1B4B\\u1B83-\\u1BA0\\u1BAE\\u1BAF\\u1BBA-\\u1BE5\\u1C00-\\u1C23\\u1C4D-\\u1C4F\\u1C5A-\\u1C7D\\u1C80-\\u1C88\\u1C90-\\u1CBA\\u1CBD-\\u1CBF\\u1CE9-\\u1CEC\\u1CEE-\\u1CF3\\u1CF5\\u1CF6\\u1CFA\\u1D00-\\u1DBF\\u1E00-\\u1F15\\u1F18-\\u1F1D\\u1F20-\\u1F45\\u1F48-\\u1F4D\\u1F50-\\u1F57\\u1F59\\u1F5B\\u1F5D\\u1F5F-\\u1F7D\\u1F80-\\u1FB4\\u1FB6-\\u1FBC\\u1FBE\\u1FC2-\\u1FC4\\u1FC6-\\u1FCC\\u1FD0-\\u1FD3\\u1FD6-\\u1FDB\\u1FE0-\\u1FEC\\u1FF2-\\u1FF4\\u1FF6-\\u1FFC\\u2071\\u207F\\u2090-\\u209C\\u2102\\u2107\\u210A-\\u2113\\u2115\\u2118-\\u211D\\u2124\\u2126\\u2128\\u212A-\\u2139\\u213C-\\u213F\\u2145-\\u2149\\u214E\\u2160-\\u2188\\u2C00-\\u2C2E\\u2C30-\\u2C5E\\u2C60-\\u2CE4\\u2CEB-\\u2CEE\\u2CF2\\u2CF3\\u2D00-\\u2D25\\u2D27\\u2D2D\\u2D30-\\u2D67\\u2D6F\\u2D80-\\u2D96\\u2DA0-\\u2DA6\\u2DA8-\\u2DAE\\u2DB0-\\u2DB6\\u2DB8-\\u2DBE\\u2DC0-\\u2DC6\\u2DC8-\\u2DCE\\u2DD0-\\u2DD6\\u2DD8-\\u2DDE\\u3005-\\u3007\\u3021-\\u3029\\u3031-\\u3035\\u3038-\\u303C\\u3041-\\u3096\\u309B-\\u309F\\u30A1-\\u30FA\\u30FC-\\u30FF\\u3105-\\u312F\\u3131-\\u318E\\u31A0-\\u31BF\\u31F0-\\u31FF\\u3400-\\u4DBF\\u4E00-\\u9FFC\\uA000-\\uA48C\\uA4D0-\\uA4FD\\uA500-\\uA60C\\uA610-\\uA61F\\uA62A\\uA62B\\uA640-\\uA66E\\uA67F-\\uA69D\\uA6A0-\\uA6EF\\uA717-\\uA71F\\uA722-\\uA788\\uA78B-\\uA7BF\\uA7C2-\\uA7CA\\uA7F5-\\uA801\\uA803-\\uA805\\uA807-\\uA80A\\uA80C-\\uA822\\uA840-\\uA873\\uA882-\\uA8B3\\uA8F2-\\uA8F7\\uA8FB\\uA8FD\\uA8FE\\uA90A-\\uA925\\uA930-\\uA946\\uA960-\\uA97C\\uA984-\\uA9B2\\uA9CF\\uA9E0-\\uA9E4\\uA9E6-\\uA9EF\\uA9FA-\\uA9FE\\uAA00-\\uAA28\\uAA40-\\uAA42\\uAA44-\\uAA4B\\uAA60-\\uAA76\\uAA7A\\uAA7E-\\uAAAF\\uAAB1\\uAAB5\\uAAB6\\uAAB9-\\uAABD\\uAAC0\\uAAC2\\uAADB-\\uAADD\\uAAE0-\\uAAEA\\uAAF2-\\uAAF4\\uAB01-\\uAB06\\uAB09-\\uAB0E\\uAB11-\\uAB16\\uAB20-\\uAB26\\uAB28-\\uAB2E\\uAB30-\\uAB5A\\uAB5C-\\uAB69\\uAB70-\\uABE2\\uAC00-\\uD7A3\\uD7B0-\\uD7C6\\uD7CB-\\uD7FB\\uF900-\\uFA6D\\uFA70-\\uFAD9\\uFB00-\\uFB06\\uFB13-\\uFB17\\uFB1D\\uFB1F-\\uFB28\\uFB2A-\\uFB36\\uFB38-\\uFB3C\\uFB3E\\uFB40\\uFB41\\uFB43\\uFB44\\uFB46-\\uFBB1\\uFBD3-\\uFD3D\\uFD50-\\uFD8F\\uFD92-\\uFDC7\\uFDF0-\\uFDFB\\uFE70-\\uFE74\\uFE76-\\uFEFC\\uFF21-\\uFF3A\\uFF41-\\uFF5A\\uFF66-\\uFFBE\\uFFC2-\\uFFC7\\uFFCA-\\uFFCF\\uFFD2-\\uFFD7\\uFFDA-\\uFFDC]|\\uD800[\\uDC00-\\uDC0B\\uDC0D-\\uDC26\\uDC28-\\uDC3A\\uDC3C\\uDC3D\\uDC3F-\\uDC4D\\uDC50-\\uDC5D\\uDC80-\\uDCFA\\uDD40-\\uDD74\\uDE80-\\uDE9C\\uDEA0-\\uDED0\\uDF00-\\uDF1F\\uDF2D-\\uDF4A\\uDF50-\\uDF75\\uDF80-\\uDF9D\\uDFA0-\\uDFC3\\uDFC8-\\uDFCF\\uDFD1-\\uDFD5]|\\uD801[\\uDC00-\\uDC9D\\uDCB0-\\uDCD3\\uDCD8-\\uDCFB\\uDD00-\\uDD27\\uDD30-\\uDD63\\uDE00-\\uDF36\\uDF40-\\uDF55\\uDF60-\\uDF67]|\\uD802[\\uDC00-\\uDC05\\uDC08\\uDC0A-\\uDC35\\uDC37\\uDC38\\uDC3C\\uDC3F-\\uDC55\\uDC60-\\uDC76\\uDC80-\\uDC9E\\uDCE0-\\uDCF2\\uDCF4\\uDCF5\\uDD00-\\uDD15\\uDD20-\\uDD39\\uDD80-\\uDDB7\\uDDBE\\uDDBF\\uDE00\\uDE10-\\uDE13\\uDE15-\\uDE17\\uDE19-\\uDE35\\uDE60-\\uDE7C\\uDE80-\\uDE9C\\uDEC0-\\uDEC7\\uDEC9-\\uDEE4\\uDF00-\\uDF35\\uDF40-\\uDF55\\uDF60-\\uDF72\\uDF80-\\uDF91]|\\uD803[\\uDC00-\\uDC48\\uDC80-\\uDCB2\\uDCC0-\\uDCF2\\uDD00-\\uDD23\\uDE80-\\uDEA9\\uDEB0\\uDEB1\\uDF00-\\uDF1C\\uDF27\\uDF30-\\uDF45\\uDFB0-\\uDFC4\\uDFE0-\\uDFF6]|\\uD804[\\uDC03-\\uDC37\\uDC83-\\uDCAF\\uDCD0-\\uDCE8\\uDD03-\\uDD26\\uDD44\\uDD47\\uDD50-\\uDD72\\uDD76\\uDD83-\\uDDB2\\uDDC1-\\uDDC4\\uDDDA\\uDDDC\\uDE00-\\uDE11\\uDE13-\\uDE2B\\uDE80-\\uDE86\\uDE88\\uDE8A-\\uDE8D\\uDE8F-\\uDE9D\\uDE9F-\\uDEA8\\uDEB0-\\uDEDE\\uDF05-\\uDF0C\\uDF0F\\uDF10\\uDF13-\\uDF28\\uDF2A-\\uDF30\\uDF32\\uDF33\\uDF35-\\uDF39\\uDF3D\\uDF50\\uDF5D-\\uDF61]|\\uD805[\\uDC00-\\uDC34\\uDC47-\\uDC4A\\uDC5F-\\uDC61\\uDC80-\\uDCAF\\uDCC4\\uDCC5\\uDCC7\\uDD80-\\uDDAE\\uDDD8-\\uDDDB\\uDE00-\\uDE2F\\uDE44\\uDE80-\\uDEAA\\uDEB8\\uDF00-\\uDF1A]|\\uD806[\\uDC00-\\uDC2B\\uDCA0-\\uDCDF\\uDCFF-\\uDD06\\uDD09\\uDD0C-\\uDD13\\uDD15\\uDD16\\uDD18-\\uDD2F\\uDD3F\\uDD41\\uDDA0-\\uDDA7\\uDDAA-\\uDDD0\\uDDE1\\uDDE3\\uDE00\\uDE0B-\\uDE32\\uDE3A\\uDE50\\uDE5C-\\uDE89\\uDE9D\\uDEC0-\\uDEF8]|\\uD807[\\uDC00-\\uDC08\\uDC0A-\\uDC2E\\uDC40\\uDC72-\\uDC8F\\uDD00-\\uDD06\\uDD08\\uDD09\\uDD0B-\\uDD30\\uDD46\\uDD60-\\uDD65\\uDD67\\uDD68\\uDD6A-\\uDD89\\uDD98\\uDEE0-\\uDEF2\\uDFB0]|\\uD808[\\uDC00-\\uDF99]|\\uD809[\\uDC00-\\uDC6E\\uDC80-\\uDD43]|[\\uD80C\\uD81C-\\uD820\\uD822\\uD840-\\uD868\\uD86A-\\uD86C\\uD86F-\\uD872\\uD874-\\uD879\\uD880-\\uD883][\\uDC00-\\uDFFF]|\\uD80D[\\uDC00-\\uDC2E]|\\uD811[\\uDC00-\\uDE46]|\\uD81A[\\uDC00-\\uDE38\\uDE40-\\uDE5E\\uDED0-\\uDEED\\uDF00-\\uDF2F\\uDF40-\\uDF43\\uDF63-\\uDF77\\uDF7D-\\uDF8F]|\\uD81B[\\uDE40-\\uDE7F\\uDF00-\\uDF4A\\uDF50\\uDF93-\\uDF9F\\uDFE0\\uDFE1\\uDFE3]|\\uD821[\\uDC00-\\uDFF7]|\\uD823[\\uDC00-\\uDCD5\\uDD00-\\uDD08]|\\uD82C[\\uDC00-\\uDD1E\\uDD50-\\uDD52\\uDD64-\\uDD67\\uDD70-\\uDEFB]|\\uD82F[\\uDC00-\\uDC6A\\uDC70-\\uDC7C\\uDC80-\\uDC88\\uDC90-\\uDC99]|\\uD835[\\uDC00-\\uDC54\\uDC56-\\uDC9C\\uDC9E\\uDC9F\\uDCA2\\uDCA5\\uDCA6\\uDCA9-\\uDCAC\\uDCAE-\\uDCB9\\uDCBB\\uDCBD-\\uDCC3\\uDCC5-\\uDD05\\uDD07-\\uDD0A\\uDD0D-\\uDD14\\uDD16-\\uDD1C\\uDD1E-\\uDD39\\uDD3B-\\uDD3E\\uDD40-\\uDD44\\uDD46\\uDD4A-\\uDD50\\uDD52-\\uDEA5\\uDEA8-\\uDEC0\\uDEC2-\\uDEDA\\uDEDC-\\uDEFA\\uDEFC-\\uDF14\\uDF16-\\uDF34\\uDF36-\\uDF4E\\uDF50-\\uDF6E\\uDF70-\\uDF88\\uDF8A-\\uDFA8\\uDFAA-\\uDFC2\\uDFC4-\\uDFCB]|\\uD838[\\uDD00-\\uDD2C\\uDD37-\\uDD3D\\uDD4E\\uDEC0-\\uDEEB]|\\uD83A[\\uDC00-\\uDCC4\\uDD00-\\uDD43\\uDD4B]|\\uD83B[\\uDE00-\\uDE03\\uDE05-\\uDE1F\\uDE21\\uDE22\\uDE24\\uDE27\\uDE29-\\uDE32\\uDE34-\\uDE37\\uDE39\\uDE3B\\uDE42\\uDE47\\uDE49\\uDE4B\\uDE4D-\\uDE4F\\uDE51\\uDE52\\uDE54\\uDE57\\uDE59\\uDE5B\\uDE5D\\uDE5F\\uDE61\\uDE62\\uDE64\\uDE67-\\uDE6A\\uDE6C-\\uDE72\\uDE74-\\uDE77\\uDE79-\\uDE7C\\uDE7E\\uDE80-\\uDE89\\uDE8B-\\uDE9B\\uDEA1-\\uDEA3\\uDEA5-\\uDEA9\\uDEAB-\\uDEBB]|\\uD869[\\uDC00-\\uDEDD\\uDF00-\\uDFFF]|\\uD86D[\\uDC00-\\uDF34\\uDF40-\\uDFFF]|\\uD86E[\\uDC00-\\uDC1D\\uDC20-\\uDFFF]|\\uD873[\\uDC00-\\uDEA1\\uDEB0-\\uDFFF]|\\uD87A[\\uDC00-\\uDFE0]|\\uD87E[\\uDC00-\\uDE1D]|\\uD884[\\uDC00-\\uDF4A])");
-  
+  public static final boolean isJavascriptIdentifierStart(int ch) {
+    return fastPathLetters(ch)
+        || (ch === '$' || ch === '_')
+        || JavascriptIdentifierStart
+              .matcher(Character.toString(ch))
+              .matches();
+  }
+
   /**
     https://www.ecma-international.org/ecma-262/5.1/#sec-7.6
 
@@ -112,5 +116,15 @@ public static final boolean isJavascriptIdentifierPart(int ch) {
       <ZWNJ>
       <ZWJ>
   */
+  public static final boolean isJavascriptIdentifierPart(int ch) {
+    return fastPathAscii(ch)
+        || (fastPathLetters(ch) | fastPathDigits(ch))
+        || JavascriptIdentifierPart
+              .matcher(Character.toString(ch))
+              .matches();
+  }
+  
+  private static final Pattern JavascriptIdentifierStart = Pattern.compile("(?:[\\$A-Z_a-z\\xAA\\xB5\\xBA\\xC0-\\xD6\\xD8-\\xF6\\xF8-\\u02C1\\u02C6-\\u02D1\\u02E0-\\u02E4\\u02EC\\u02EE\\u0370-\\u0374\\u0376\\u0377\\u037A-\\u037D\\u037F\\u0386\\u0388-\\u038A\\u038C\\u038E-\\u03A1\\u03A3-\\u03F5\\u03F7-\\u0481\\u048A-\\u052F\\u0531-\\u0556\\u0559\\u0560-\\u0588\\u05D0-\\u05EA\\u05EF-\\u05F2\\u0620-\\u064A\\u066E\\u066F\\u0671-\\u06D3\\u06D5\\u06E5\\u06E6\\u06EE\\u06EF\\u06FA-\\u06FC\\u06FF\\u0710\\u0712-\\u072F\\u074D-\\u07A5\\u07B1\\u07CA-\\u07EA\\u07F4\\u07F5\\u07FA\\u0800-\\u0815\\u081A\\u0824\\u0828\\u0840-\\u0858\\u0860-\\u086A\\u08A0-\\u08B4\\u08B6-\\u08C7\\u0904-\\u0939\\u093D\\u0950\\u0958-\\u0961\\u0971-\\u0980\\u0985-\\u098C\\u098F\\u0990\\u0993-\\u09A8\\u09AA-\\u09B0\\u09B2\\u09B6-\\u09B9\\u09BD\\u09CE\\u09DC\\u09DD\\u09DF-\\u09E1\\u09F0\\u09F1\\u09FC\\u0A05-\\u0A0A\\u0A0F\\u0A10\\u0A13-\\u0A28\\u0A2A-\\u0A30\\u0A32\\u0A33\\u0A35\\u0A36\\u0A38\\u0A39\\u0A59-\\u0A5C\\u0A5E\\u0A72-\\u0A74\\u0A85-\\u0A8D\\u0A8F-\\u0A91\\u0A93-\\u0AA8\\u0AAA-\\u0AB0\\u0AB2\\u0AB3\\u0AB5-\\u0AB9\\u0ABD\\u0AD0\\u0AE0\\u0AE1\\u0AF9\\u0B05-\\u0B0C\\u0B0F\\u0B10\\u0B13-\\u0B28\\u0B2A-\\u0B30\\u0B32\\u0B33\\u0B35-\\u0B39\\u0B3D\\u0B5C\\u0B5D\\u0B5F-\\u0B61\\u0B71\\u0B83\\u0B85-\\u0B8A\\u0B8E-\\u0B90\\u0B92-\\u0B95\\u0B99\\u0B9A\\u0B9C\\u0B9E\\u0B9F\\u0BA3\\u0BA4\\u0BA8-\\u0BAA\\u0BAE-\\u0BB9\\u0BD0\\u0C05-\\u0C0C\\u0C0E-\\u0C10\\u0C12-\\u0C28\\u0C2A-\\u0C39\\u0C3D\\u0C58-\\u0C5A\\u0C60\\u0C61\\u0C80\\u0C85-\\u0C8C\\u0C8E-\\u0C90\\u0C92-\\u0CA8\\u0CAA-\\u0CB3\\u0CB5-\\u0CB9\\u0CBD\\u0CDE\\u0CE0\\u0CE1\\u0CF1\\u0CF2\\u0D04-\\u0D0C\\u0D0E-\\u0D10\\u0D12-\\u0D3A\\u0D3D\\u0D4E\\u0D54-\\u0D56\\u0D5F-\\u0D61\\u0D7A-\\u0D7F\\u0D85-\\u0D96\\u0D9A-\\u0DB1\\u0DB3-\\u0DBB\\u0DBD\\u0DC0-\\u0DC6\\u0E01-\\u0E30\\u0E32\\u0E33\\u0E40-\\u0E46\\u0E81\\u0E82\\u0E84\\u0E86-\\u0E8A\\u0E8C-\\u0EA3\\u0EA5\\u0EA7-\\u0EB0\\u0EB2\\u0EB3\\u0EBD\\u0EC0-\\u0EC4\\u0EC6\\u0EDC-\\u0EDF\\u0F00\\u0F40-\\u0F47\\u0F49-\\u0F6C\\u0F88-\\u0F8C\\u1000-\\u102A\\u103F\\u1050-\\u1055\\u105A-\\u105D\\u1061\\u1065\\u1066\\u106E-\\u1070\\u1075-\\u1081\\u108E\\u10A0-\\u10C5\\u10C7\\u10CD\\u10D0-\\u10FA\\u10FC-\\u1248\\u124A-\\u124D\\u1250-\\u1256\\u1258\\u125A-\\u125D\\u1260-\\u1288\\u128A-\\u128D\\u1290-\\u12B0\\u12B2-\\u12B5\\u12B8-\\u12BE\\u12C0\\u12C2-\\u12C5\\u12C8-\\u12D6\\u12D8-\\u1310\\u1312-\\u1315\\u1318-\\u135A\\u1380-\\u138F\\u13A0-\\u13F5\\u13F8-\\u13FD\\u1401-\\u166C\\u166F-\\u167F\\u1681-\\u169A\\u16A0-\\u16EA\\u16EE-\\u16F8\\u1700-\\u170C\\u170E-\\u1711\\u1720-\\u1731\\u1740-\\u1751\\u1760-\\u176C\\u176E-\\u1770\\u1780-\\u17B3\\u17D7\\u17DC\\u1820-\\u1878\\u1880-\\u18A8\\u18AA\\u18B0-\\u18F5\\u1900-\\u191E\\u1950-\\u196D\\u1970-\\u1974\\u1980-\\u19AB\\u19B0-\\u19C9\\u1A00-\\u1A16\\u1A20-\\u1A54\\u1AA7\\u1B05-\\u1B33\\u1B45-\\u1B4B\\u1B83-\\u1BA0\\u1BAE\\u1BAF\\u1BBA-\\u1BE5\\u1C00-\\u1C23\\u1C4D-\\u1C4F\\u1C5A-\\u1C7D\\u1C80-\\u1C88\\u1C90-\\u1CBA\\u1CBD-\\u1CBF\\u1CE9-\\u1CEC\\u1CEE-\\u1CF3\\u1CF5\\u1CF6\\u1CFA\\u1D00-\\u1DBF\\u1E00-\\u1F15\\u1F18-\\u1F1D\\u1F20-\\u1F45\\u1F48-\\u1F4D\\u1F50-\\u1F57\\u1F59\\u1F5B\\u1F5D\\u1F5F-\\u1F7D\\u1F80-\\u1FB4\\u1FB6-\\u1FBC\\u1FBE\\u1FC2-\\u1FC4\\u1FC6-\\u1FCC\\u1FD0-\\u1FD3\\u1FD6-\\u1FDB\\u1FE0-\\u1FEC\\u1FF2-\\u1FF4\\u1FF6-\\u1FFC\\u2071\\u207F\\u2090-\\u209C\\u2102\\u2107\\u210A-\\u2113\\u2115\\u2118-\\u211D\\u2124\\u2126\\u2128\\u212A-\\u2139\\u213C-\\u213F\\u2145-\\u2149\\u214E\\u2160-\\u2188\\u2C00-\\u2C2E\\u2C30-\\u2C5E\\u2C60-\\u2CE4\\u2CEB-\\u2CEE\\u2CF2\\u2CF3\\u2D00-\\u2D25\\u2D27\\u2D2D\\u2D30-\\u2D67\\u2D6F\\u2D80-\\u2D96\\u2DA0-\\u2DA6\\u2DA8-\\u2DAE\\u2DB0-\\u2DB6\\u2DB8-\\u2DBE\\u2DC0-\\u2DC6\\u2DC8-\\u2DCE\\u2DD0-\\u2DD6\\u2DD8-\\u2DDE\\u3005-\\u3007\\u3021-\\u3029\\u3031-\\u3035\\u3038-\\u303C\\u3041-\\u3096\\u309B-\\u309F\\u30A1-\\u30FA\\u30FC-\\u30FF\\u3105-\\u312F\\u3131-\\u318E\\u31A0-\\u31BF\\u31F0-\\u31FF\\u3400-\\u4DBF\\u4E00-\\u9FFC\\uA000-\\uA48C\\uA4D0-\\uA4FD\\uA500-\\uA60C\\uA610-\\uA61F\\uA62A\\uA62B\\uA640-\\uA66E\\uA67F-\\uA69D\\uA6A0-\\uA6EF\\uA717-\\uA71F\\uA722-\\uA788\\uA78B-\\uA7BF\\uA7C2-\\uA7CA\\uA7F5-\\uA801\\uA803-\\uA805\\uA807-\\uA80A\\uA80C-\\uA822\\uA840-\\uA873\\uA882-\\uA8B3\\uA8F2-\\uA8F7\\uA8FB\\uA8FD\\uA8FE\\uA90A-\\uA925\\uA930-\\uA946\\uA960-\\uA97C\\uA984-\\uA9B2\\uA9CF\\uA9E0-\\uA9E4\\uA9E6-\\uA9EF\\uA9FA-\\uA9FE\\uAA00-\\uAA28\\uAA40-\\uAA42\\uAA44-\\uAA4B\\uAA60-\\uAA76\\uAA7A\\uAA7E-\\uAAAF\\uAAB1\\uAAB5\\uAAB6\\uAAB9-\\uAABD\\uAAC0\\uAAC2\\uAADB-\\uAADD\\uAAE0-\\uAAEA\\uAAF2-\\uAAF4\\uAB01-\\uAB06\\uAB09-\\uAB0E\\uAB11-\\uAB16\\uAB20-\\uAB26\\uAB28-\\uAB2E\\uAB30-\\uAB5A\\uAB5C-\\uAB69\\uAB70-\\uABE2\\uAC00-\\uD7A3\\uD7B0-\\uD7C6\\uD7CB-\\uD7FB\\uF900-\\uFA6D\\uFA70-\\uFAD9\\uFB00-\\uFB06\\uFB13-\\uFB17\\uFB1D\\uFB1F-\\uFB28\\uFB2A-\\uFB36\\uFB38-\\uFB3C\\uFB3E\\uFB40\\uFB41\\uFB43\\uFB44\\uFB46-\\uFBB1\\uFBD3-\\uFD3D\\uFD50-\\uFD8F\\uFD92-\\uFDC7\\uFDF0-\\uFDFB\\uFE70-\\uFE74\\uFE76-\\uFEFC\\uFF21-\\uFF3A\\uFF41-\\uFF5A\\uFF66-\\uFFBE\\uFFC2-\\uFFC7\\uFFCA-\\uFFCF\\uFFD2-\\uFFD7\\uFFDA-\\uFFDC]|\\uD800[\\uDC00-\\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+  
   private static final Pattern JavascriptIdentifierPart = Pattern.compile("(?:[\\$0-9A-Z_a-z\\xAA\\xB5\\xB7\\xBA\\xC0-\\xD6\\xD8-\\xF6\\xF8-\\u02C1\\u02C6-\\u02D1\\u02E0-\\u02E4\\u02EC\\u02EE\\u0300-\\u0374\\u0376\\u0377\\u037A-\\u037D\\u037F\\u0386-\\u038A\\u038C\\u038E-\\u03A1\\u03A3-\\u03F5\\u03F7-\\u0481\\u0483-\\u0487\\u048A-\\u052F\\u0531-\\u0556\\u0559\\u0560-\\u0588\\u0591-\\u05BD\\u05BF\\u05C1\\u05C2\\u05C4\\u05C5\\u05C7\\u05D0-\\u05EA\\u05EF-\\u05F2\\u0610-\\u061A\\u0620-\\u0669\\u066E-\\u06D3\\u06D5-\\u06DC\\u06DF-\\u06E8\\u06EA-\\u06FC\\u06FF\\u0710-\\u074A\\u074D-\\u07B1\\u07C0-\\u07F5\\u07FA\\u07FD\\u0800-\\u082D\\u0840-\\u085B\\u0860-\\u086A\\u08A0-\\u08B4\\u08B6-\\u08C7\\u08D3-\\u08E1\\u08E3-\\u0963\\u0966-\\u096F\\u0971-\\u0983\\u0985-\\u098C\\u098F\\u0990\\u0993-\\u09A8\\u09AA-\\u09B0\\u09B2\\u09B6-\\u09B9\\u09BC-\\u09C4\\u09C7\\u09C8\\u09CB-\\u09CE\\u09D7\\u09DC\\u09DD\\u09DF-\\u09E3\\u09E6-\\u09F1\\u09FC\\u09FE\\u0A01-\\u0A03\\u0A05-\\u0A0A\\u0A0F\\u0A10\\u0A13-\\u0A28\\u0A2A-\\u0A30\\u0A32\\u0A33\\u0A35\\u0A36\\u0A38\\u0A39\\u0A3C\\u0A3E-\\u0A42\\u0A47\\u0A48\\u0A4B-\\u0A4D\\u0A51\\u0A59-\\u0A5C\\u0A5E\\u0A66-\\u0A75\\u0A81-\\u0A83\\u0A85-\\u0A8D\\u0A8F-\\u0A91\\u0A93-\\u0AA8\\u0AAA-\\u0AB0\\u0AB2\\u0AB3\\u0AB5-\\u0AB9\\u0ABC-\\u0AC5\\u0AC7-\\u0AC9\\u0ACB-\\u0ACD\\u0AD0\\u0AE0-\\u0AE3\\u0AE6-\\u0AEF\\u0AF9-\\u0AFF\\u0B01-\\u0B03\\u0B05-\\u0B0C\\u0B0F\\u0B10\\u0B13-\\u0B28\\u0B2A-\\u0B30\\u0B32\\u0B33\\u0B35-\\u0B39\\u0B3C-\\u0B44\\u0B47\\u0B48\\u0B4B-\\u0B4D\\u0B55-\\u0B57\\u0B5C\\u0B5D\\u0B5F-\\u0B63\\u0B66-\\u0B6F\\u0B71\\u0B82\\u0B83\\u0B85-\\u0B8A\\u0B8E-\\u0B90\\u0B92-\\u0B95\\u0B99\\u0B9A\\u0B9C\\u0B9E\\u0B9F\\u0BA3\\u0BA4\\u0BA8-\\u0BAA\\u0BAE-\\u0BB9\\u0BBE-\\u0BC2\\u0BC6-\\u0BC8\\u0BCA-\\u0BCD\\u0BD0\\u0BD7\\u0BE6-\\u0BEF\\u0C00-\\u0C0C\\u0C0E-\\u0C10\\u0C12-\\u0C28\\u0C2A-\\u0C39\\u0C3D-\\u0C44\\u0C46-\\u0C48\\u0C4A-\\u0C4D\\u0C55\\u0C56\\u0C58-\\u0C5A\\u0C60-\\u0C63\\u0C66-\\u0C6F\\u0C80-\\u0C83\\u0C85-\\u0C8C\\u0C8E-\\u0C90\\u0C92-\\u0CA8\\u0CAA-\\u0CB3\\u0CB5-\\u0CB9\\u0CBC-\\u0CC4\\u0CC6-\\u0CC8\\u0CCA-\\u0CCD\\u0CD5\\u0CD6\\u0CDE\\u0CE0-\\u0CE3\\u0CE6-\\u0CEF\\u0CF1\\u0CF2\\u0D00-\\u0D0C\\u0D0E-\\u0D10\\u0D12-\\u0D44\\u0D46-\\u0D48\\u0D4A-\\u0D4E\\u0D54-\\u0D57\\u0D5F-\\u0D63\\u0D66-\\u0D6F\\u0D7A-\\u0D7F\\u0D81-\\u0D83\\u0D85-\\u0D96\\u0D9A-\\u0DB1\\u0DB3-\\u0DBB\\u0DBD\\u0DC0-\\u0DC6\\u0DCA\\u0DCF-\\u0DD4\\u0DD6\\u0DD8-\\u0DDF\\u0DE6-\\u0DEF\\u0DF2\\u0DF3\\u0E01-\\u0E3A\\u0E40-\\u0E4E\\u0E50-\\u0E59\\u0E81\\u0E82\\u0E84\\u0E86-\\u0E8A\\u0E8C-\\u0EA3\\u0EA5\\u0EA7-\\u0EBD\\u0EC0-\\u0EC4\\u0EC6\\u0EC8-\\u0ECD\\u0ED0-\\u0ED9\\u0EDC-\\u0EDF\\u0F00\\u0F18\\u0F19\\u0F20-\\u0F29\\u0F35\\u0F37\\u0F39\\u0F3E-\\u0F47\\u0F49-\\u0F6C\\u0F71-\\u0F84\\u0F86-\\u0F97\\u0F99-\\u0FBC\\u0FC6\\u1000-\\u1049\\u1050-\\u109D\\u10A0-\\u10C5\\u10C7\\u10CD\\u10D0-\\u10FA\\u10FC-\\u1248\\u124A-\\u124D\\u1250-\\u1256\\u1258\\u125A-\\u125D\\u1260-\\u1288\\u128A-\\u128D\\u1290-\\u12B0\\u12B2-\\u12B5\\u12B8-\\u12BE\\u12C0\\u12C2-\\u12C5\\u12C8-\\u12D6\\u12D8-\\u1310\\u1312-\\u1315\\u1318-\\u135A\\u135D-\\u135F\\u1369-\\u1371\\u1380-\\u138F\\u13A0-\\u13F5\\u13F8-\\u13FD\\u1401-\\u166C\\u166F-\\u167F\\u1681-\\u169A\\u16A0-\\u16EA\\u16EE-\\u16F8\\u1700-\\u170C\\u170E-\\u1714\\u1720-\\u1734\\u1740-\\u1753\\u1760-\\u176C\\u176E-\\u1770\\u1772\\u1773\\u1780-\\u17D3\\u17D7\\u17DC\\u17DD\\u17E0-\\u17E9\\u180B-\\u180D\\u1810-\\u1819\\u1820-\\u1878\\u1880-\\u18AA\\u18B0-\\u18F5\\u1900-\\u191E\\u1920-\\u192B\\u1930-\\u193B\\u1946-\\u196D\\u1970-\\u1974\\u1980-\\u19AB\\u19B0-\\u19C9\\u19D0-\\u19DA\\u1A00-\\u1A1B\\u1A20-\\u1A5E\\u1A60-\\u1A7C\\u1A7F-\\u1A89\\u1A90-\\u1A99\\u1AA7\\u1AB0-\\u1ABD\\u1ABF\\u1AC0\\u1B00-\\u1B4B\\u1B50-\\u1B59\\u1B6B-\\u1B73\\u1B80-\\u1BF3\\u1C00-\\u1C37\\u1C40-\\u1C49\\u1C4D-\\u1C7D\\u1C80-\\u1C88\\u1C90-\\u1CBA\\u1CBD-\\u1CBF\\u1CD0-\\u1CD2\\u1CD4-\\u1CFA\\u1D00-\\u1DF9\\u1DFB-\\u1F15\\u1F18-\\u1F1D\\u1F20-\\u1F45\\u1F48-\\u1F4D\\u1F50-\\u1F57\\u1F59\\u1F5B\\u1F5D\\u1F5F-\\u1F7D\\u1F80-\\u1FB4\\u1FB6-\\u1FBC\\u1FBE\\u1FC2-\\u1FC4\\u1FC6-\\u1FCC\\u1FD0-\\u1FD3\\u1FD6-\\u1FDB\\u1FE0-\\u1FEC\\u1FF2-\\u1FF4\\u1FF6-\\u1FFC\\u200C\\u200D\\u203F\\u2040\\u2054\\u2071\\u207F\\u2090-\\u209C\\u20D0-\\u20DC\\u20E1\\u20E5-\\u20F0\\u2102\\u2107\\u210A-\\u2113\\u2115\\u2118-\\u211D\\u2124\\u2126\\u2128\\u212A-\\u2139\\u213C-\\u213F\\u2145-\\u2149\\u214E\\u2160-\\u2188\\u2C00-\\u2C2E\\u2C30-\\u2C5E\\u2C60-\\u2CE4\\u2CEB-\\u2CF3\\u2D00-\\u2D25\\u2D27\\u2D2D\\u2D30-\\u2D67\\u2D6F\\u2D7F-\\u2D96\\u2DA0-\\u2DA6\\u2DA8-\\u2DAE\\u2DB0-\\u2DB6\\u2DB8-\\u2DBE\\u2DC0-\\u2DC6\\u2DC8-\\u2DCE\\u2DD0-\\u2DD6\\u2DD8-\\u2DDE\\u2DE0-\\u2DFF\\u3005-\\u3007\\u3021-\\u302F\\u3031-\\u3035\\u3038-\\u303C\\u3041-\\u3096\\u3099-\\u309F\\u30A1-\\u30FA\\u30FC-\\u30FF\\u3105-\\u312F\\u3131-\\u318E\\u31A0-\\u31BF\\u31F0-\\u31FF\\u3400-\\u4DBF\\u4E00-\\u9FFC\\uA000-\\uA48C\\uA4D0-\\uA4FD\\uA500-\\uA60C\\uA610-\\uA62B\\uA640-\\uA66F\\uA674-\\uA67D\\uA67F-\\uA6F1\\uA717-\\uA71F\\uA722-\\uA788\\uA78B-\\uA7BF\\uA7C2-\\uA7CA\\uA7F5-\\uA827\\uA82C\\uA840-\\uA873\\uA880-\\uA8C5\\uA8D0-\\uA8D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uDE4D-\\uDE4F\\uDE51\\uDE52\\uDE54\\uDE57\\uDE59\\uDE5B\\uDE5D\\uDE5F\\uDE61\\uDE62\\uDE64\\uDE67-\\uDE6A\\uDE6C-\\uDE72\\uDE74-\\uDE77\\uDE79-\\uDE7C\\uDE7E\\uDE80-\\uDE89\\uDE8B-\\uDE9B\\uDEA1-\\uDEA3\\uDEA5-\\uDEA9\\uDEAB-\\uDEBB]|\\uD83E[\\uDFF0-\\uDFF9]|\\uD869[\\uDC00-\\uDEDD\\uDF00-\\uDFFF]|\\uD86D[\\uDC00-\\uDF34\\uDF40-\\uDFFF]|\\uD86E[\\uDC00-\\uDC1D\\uDC20-\\uDFFF]|\\uD873[\\uDC00-\\uDEA1\\uDEB0-\\uDFFF]|\\uD87A[\\uDC00-\\uDFE0]|\\uD87E[\\uDC00-\\uDE1D]|\\uD884[\\uDC00-\\uDF4A]|\\uDB40[\\uDD00-\\uDDEF])");
 }
\ No newline at end of file

From 72d6ce800e965df604196be0493de3146518896c Mon Sep 17 00:00:00 2001
From: Christian Lewis <ctjl96@gmail.com>
Date: Wed, 12 Aug 2020 16:39:09 -0500
Subject: [PATCH 19/28] Reverting fastPathAscii check until further advisement

---
 .../javascript/jscomp/parsing/parser/util/UnicodeMatch.java   | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java b/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
index a75ad4eb334..34facbb2057 100644
--- a/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
+++ b/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
@@ -117,8 +117,8 @@ public static final boolean isJavascriptIdentifierStart(int ch) {
       <ZWJ>
   */
   public static final boolean isJavascriptIdentifierPart(int ch) {
-    return fastPathAscii(ch)
-        || (fastPathLetters(ch) | fastPathDigits(ch))
+    return (fastPathLetters(ch) | fastPathDigits(ch))
+        || (ch === '$' || ch === '_')
         || JavascriptIdentifierPart
               .matcher(Character.toString(ch))
               .matches();

From 7e83d4f4a31a4807c1479130c88e38d0f330a040 Mon Sep 17 00:00:00 2001
From: Christian Lewis <ctjl96@gmail.com>
Date: Wed, 12 Aug 2020 17:15:03 -0500
Subject: [PATCH 20/28] Refactored fast paths

---
 .../parsing/parser/util/UnicodeMatch.java     | 114 ++++++++++++------
 1 file changed, 80 insertions(+), 34 deletions(-)

diff --git a/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java b/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
index 34facbb2057..d62c1237fe8 100644
--- a/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
+++ b/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
@@ -38,23 +38,30 @@ public final class UnicodeMatch {
   private UnicodeMatch() {}
 
   /**
-   * Check if a given character is an ASCII character. For performance
-   * optimization.
+   * Check if a given character is an ASCII character.
    */
   private static final boolean fastPathAscii(int ch) {
     return ch <= 127;
   }
 
   /**
-   * Check if a given character is an ASCII letter. This fast path is broken
-   * into two parts because of the logical differences in `IdentifierPart` and
-   * `IdentifierStart`, where the latter does not accept a digit.
+   * These fast paths are broken into distinct parts because of the logical
+   * differences in `IdentifierStart` and `IdentifierPart`, where the former
+   * does not accept a digit.
    *
-   * Intentionally avoiding short circuiting behavior of "||" and "&&". This
-   * minimizes branches in this code which minimizes branch prediction misses.
+   * A fast path is created for `UnicodeLetter` and `UnicodeDigit`, and then one
+   * each for `IdentifierStart` and `IdentifierPart`.
+   */
+
+  /**
+   * Check if a given character is an ASCII letter.
    */
   @SuppressWarnings("ShortCircuitBoolean")
-  private static final boolean fastPathLetters(int ch) {
+  private static final boolean fastPathUnicodeLetter(int ch) {
+    /**
+     * Intentionally avoiding short circuiting behavior of '||' and '&&'. This
+     * minimizes branches in this code which minimizes branch prediction misses.
+     */
     return (
       ('A' <= ch & ch <= 'Z') |
       ('a' <= ch & ch <= 'z') |
@@ -75,19 +82,74 @@ private static final boolean fastPathLetters(int ch) {
     );
   }
 
-  /**
-   * Check if a given character is an ASCII digit. This fast path is broken into
-   * two parts because of the logical differences in `IdentifierPart` and
-   * `IdentifierStart`, where the latter does not accept a digit.
-   *
-   * Intentionally avoiding short circuiting behavior of "||" and "&&". This
-   * minimizes branches in this code which minimizes branch prediction misses.
+  /** 
+   * Check if a given character is an ASCII digit.
    */
   @SuppressWarnings("ShortCircuitBoolean")
-  private static final boolean fastPathDigits(int ch) {
+  private static final boolean fastPathUnicodeDigit(int ch) {
+    /**
+     * Intentionally avoiding short circuiting behavior of '||' and '&&'. This
+     * minimizes branches in this code which minimizes branch prediction misses.
+     */
     return '0' <= ch & ch <= '9';
   }
 
+  /**
+   * Check if a given character is an ASCII letter, '$' or '_'.
+   */
+  @SuppressWarnings("ShortCircuitBoolean")
+  private static final boolean fastPathIdentifierStart(int ch) {
+    /**
+     * Intentionally avoiding short circuiting behavior of '||' and '&&'. This
+     * minimizes branches in this code which minimizes branch prediction misses.
+     */
+    return (
+      fastPathUnicodeLetter(ch) |
+      (ch == '$' | ch == '_')
+    );
+  }
+
+  /**
+   * Check if a given character is an ASCII letter, digit, '$' or '_'.
+   */
+  @SuppressWarnings("ShortCircuitBoolean")
+  private static final boolean fastPathIdentifierPart(int ch) {
+    /**
+     * Intentionally avoiding short circuiting behavior of '||' and '&&'. This
+     * minimizes branches in this code which minimizes branch prediction misses.
+     */
+    return (
+      fastPathIdentifierStart(ch) |
+      fastPathUnicodeDigit(ch)
+    );
+  }
+
+  /**
+   * Check if a character is a valid ECMAScript `IdentifierStart`. Check the
+   * fast path first, and then fall back to regex.
+   */
+  public static final boolean isJavascriptIdentifierStart(int ch) {
+    return (
+        fastPathIdentifierStart(ch) ||
+        JavascriptIdentifierStart
+            .matcher(Character.toString(ch))
+            .matches()
+    );
+  }
+
+  /**
+   * Check if a character is a valid ECMAScript `IdentifierPart`. Check the fast
+   * path first, and then fall back to regex.
+   */
+  public static final boolean isJavascriptIdentifierPart(int ch) {
+    return (
+        fastPathIdentifierPart(ch) ||
+        JavascriptIdentifierPart
+            .matcher(Character.toString(ch))
+            .matches()
+    );
+  }
+  
   /**
     https://www.ecma-international.org/ecma-262/5.1/#sec-7.6
     
@@ -97,14 +159,8 @@ private static final boolean fastPathDigits(int ch) {
       _: Character == '_'
       \ UnicodeEscapeSequence
   */
-  public static final boolean isJavascriptIdentifierStart(int ch) {
-    return fastPathLetters(ch)
-        || (ch === '$' || ch === '_')
-        || JavascriptIdentifierStart
-              .matcher(Character.toString(ch))
-              .matches();
-  }
-
+  private static final Pattern JavascriptIdentifierStart = Pattern.compile("(?:[\\$A-Z_a-z\\xAA\\xB5\\xBA\\xC0-\\xD6\\xD8-\\xF6\\xF8-\\u02C1\\u02C6-\\u02D1\\u02E0-\\u02E4\\u02EC\\u02EE\\u0370-\\u0374\\u0376\\u0377\\u037A-\\u037D\\u037F\\u0386\\u0388-\\u038A\\u038C\\u038E-\\u03A1\\u03A3-\\u03F5\\u03F7-\\u0481\\u048A-\\u052F\\u0531-\\u0556\\u0559\\u0560-\\u0588\\u05D0-\\u05EA\\u05EF-\\u05F2\\u0620-\\u064A\\u066E\\u066F\\u0671-\\u06D3\\u06D5\\u06E5\\u06E6\\u06EE\\u06EF\\u06FA-\\u06FC\\u06FF\\u0710\\u0712-\\u072F\\u074D-\\u07A5\\u07B1\\u07CA-\\u07EA\\u07F4\\u07F5\\u07FA\\u0800-\\u0815\\u081A\\u0824\\u0828\\u0840-\\u0858\\u0860-\\u086A\\u08A0-\\u08B4\\u08B6-\\u08C7\\u0904-\\u0939\\u093D\\u0950\\u0958-\\u0961\\u0971-\\u0980\\u0985-\\u098C\\u098F\\u0990\\u0993-\\u09A8\\u09AA-\\u09B0\\u09B2\\u09B6-\\u09B9\\u09BD\\u09CE\\u09DC\\u09DD\\u09DF-\\u09E1\\u09F0\\u09F1\\u09FC\\u0A05-\\u0A0A\\u0A0F\\u0A10\\u0A13-\\u0A28\\u0A2A-\\u0A30\\u0A32\\u0A33\\u0A35\\u0A36\\u0A38\\u0A39\\u0A59-\\u0A5C\\u0A5E\\u0A72-\\u0A74\\u0A85-\\u0A8D\\u0A8F-\\u0A91\\u0A93-\\u0AA8\\u0AAA-\\u0AB0\\u0AB2\\u0AB3\\u0AB5-\\u0AB9\\u0ABD\\u0AD0\\u0AE0\\u0AE1\\u0AF9\\u0B05-\\u0B0C\\u0B0F\\u0B10\\u0B13-\\u0B28\\u0B2A-\\u0B30\\u0B32\\u0B33\\u0B35-\\u0B39\\u0B3D\\u0B5C\\u0B5D\\u0B5F-\\u0B61\\u0B71\\u0B83\\u0B85-\\u0B8A\\u0B8E-\\u0B90\\u0B92-\\u0B95\\u0B99\\u0B9A\\u0B9C\\u0B9E\\u0B9F\\u0BA3\\u0BA4\\u0BA8-\\u0BAA\\u0BAE-\\u0BB9\\u0BD0\\u0C05-\\u0C0C\\u0C0E-\\u0C10\\u0C12-\\u0C28\\u0C2A-\\u0C39\\u0C3D\\u0C58-\\u0C5A\\u0C60\\u0C61\\u0C80\\u0C85-\\u0C8C\\u0C8E-\\u0C90\\u0C92-\\u0CA8\\u0CAA-\\u0CB3\\u0CB5-\\u0CB9\\u0CBD\\u0CDE\\u0CE0\\u0CE1\\u0CF1\\u0CF2\\u0D04-\\u0D0C\\u0D0E-\\u0D10\\u0D12-\\u0D3A\\u0D3D\\u0D4E\\u0D54-\\u0D56\\u0D5F-\\u0D61\\u0D7A-\\u0D7F\\u0D85-\\u0D96\\u0D9A-\\u0DB1\\u0DB3-\\u0DBB\\u0DBD\\u0DC0-\\u0DC6\\u0E01-\\u0E30\\u0E32\\u0E33\\u0E40-\\u0E46\\u0E81\\u0E82\\u0E84\\u0E86-\\u0E8A\\u0E8C-\\u0EA3\\u0EA5\\u0EA7-\\u0EB0\\u0EB2\\u0EB3\\u0EBD\\u0EC0-\\u0EC4\\u0EC6\\u0EDC-\\u0EDF\\u0F00\\u0F40-\\u0F47\\u0F49-\\u0F6C\\u0F88-\\u0F8C\\u1000-\\u102A\\u103F\\u1050-\\u1055\\u105A-\\u105D\\u1061\\u1065\\u1066\\u106E-\\u1070\\u1075-\\u1081\\u108E\\u10A0-\\u10C5\\u10C7\\u10CD\\u10D0-\\u10FA\\u10FC-\\u1248\\u124A-\\u124D\\u1250-\\u1256\\u1258\\u125A-\\u125D\\u1260-\\u1288\\u128A-\\u128D\\u1290-\\u12B0\\u12B2-\\u12B5\\u12B8-\\u12BE\\u12C0\\u12C2-\\u12C5\\u12C8-\\u12D6\\u12D8-\\u1310\\u1312-\\u1315\\u1318-\\u135A\\u1380-\\u138F\\u13A0-\\u13F5\\u13F8-\\u13FD\\u1401-\\u166C\\u166F-\\u167F\\u1681-\\u169A\\u16A0-\\u16EA\\u16EE-\\u16F8\\u1700-\\u170C\\u170E-\\u1711\\u1720-\\u1731\\u1740-\\u1751\\u1760-\\u176C\\u176E-\\u1770\\u1780-\\u17B3\\u17D7\\u17DC\\u1820-\\u1878\\u1880-\\u18A8\\u18AA\\u18B0-\\u18F5\\u1900-\\u191E\\u1950-\\u196D\\u1970-\\u1974\\u1980-\\u19AB\\u19B0-\\u19C9\\u1A00-\\u1A16\\u1A20-\\u1A54\\u1AA7\\u1B05-\\u1B33\\u1B45-\\u1B4B\\u1B83-\\u1BA0\\u1BAE\\u1BAF\\u1BBA-\\u1BE5\\u1C00-\\u1C23\\u1C4D-\\u1C4F\\u1C5A-\\u1C7D\\u1C80-\\u1C88\\u1C90-\\u1CBA\\u1CBD-\\u1CBF\\u1CE9-\\u1CEC\\u1CEE-\\u1CF3\\u1CF5\\u1CF6\\u1CFA\\u1D00-\\u1DBF\\u1E00-\\u1F15\\u1F18-\\u1F1D\\u1F20-\\u1F45\\u1F48-\\u1F4D\\u1F50-\\u1F57\\u1F59\\u1F5B\\u1F5D\\u1F5F-\\u1F7D\\u1F80-\\u1FB4\\u1FB6-\\u1FBC\\u1FBE\\u1FC2-\\u1FC4\\u1FC6-\\u1FCC\\u1FD0-\\u1FD3\\u1FD6-\\u1FDB\\u1FE0-\\u1FEC\\u1FF2-\\u1FF4\\u1FF6-\\u1FFC\\u2071\\u207F\\u2090-\\u209C\\u2102\\u2107\\u210A-\\u2113\\u2115\\u2118-\\u211D\\u2124\\u2126\\u2128\\u212A-\\u2139\\u213C-\\u213F\\u2145-\\u2149\\u214E\\u2160-\\u2188\\u2C00-\\u2C2E\\u2C30-\\u2C5E\\u2C60-\\u2CE4\\u2CEB-\\u2CEE\\u2CF2\\u2CF3\\u2D00-\\u2D25\\u2D27\\u2D2D\\u2D30-\\u2D67\\u2D6F\\u2D80-\\u2D96\\u2DA0-\\u2DA6\\u2DA8-\\u2DAE\\u2DB0-\\u2DB6\\u2DB8-\\u2DBE\\u2DC0-\\u2DC6\\u2DC8-\\u2DCE\\u2DD0-\\u2DD6\\u2DD8-\\u2DDE\\u3005-\\u3007\\u3021-\\u3029\\u3031-\\u3035\\u3038-\\u303C\\u3041-\\u3096\\u309B-\\u309F\\u30A1-\\u30FA\\u30FC-\\u30FF\\u3105-\\u312F\\u3131-\\u318E\\u31A0-\\u31BF\\u31F0-\\u31FF\\u3400-\\u4DBF\\u4E00-\\u9FFC\\uA000-\\uA48C\\uA4D0-\\uA4FD\\uA500-\\uA60C\\uA610-\\uA61F\\uA62A\\uA62B\\uA640-\\uA66E\\uA67F-\\uA69D\\uA6A0-\\uA6EF\\uA717-\\uA71F\\uA722-\\uA788\\uA78B-\\uA7BF\\uA7C2-\\uA7CA\\uA7F5-\\uA801\\uA803-\\uA805\\uA807-\\uA80A\\uA80C-\\uA822\\uA840-\\uA873\\uA882-\\uA8B3\\uA8F2-\\uA8F7\\uA8FB\\uA8FD\\uA8FE\\uA90A-\\uA925\\uA930-\\uA946\\uA960-\\uA97C\\uA984-\\uA9B2\\uA9CF\\uA9E0-\\uA9E4\\uA9E6-\\uA9EF\\uA9FA-\\uA9FE\\uAA00-\\uAA28\\uAA40-\\uAA42\\uAA44-\\uAA4B\\uAA60-\\uAA76\\uAA7A\\uAA7E-\\uAAAF\\uAAB1\\uAAB5\\uAAB6\\uAAB9-\\uAABD\\uAAC0\\uAAC2\\uAADB-\\uAADD\\uAAE0-\\uAAEA\\uAAF2-\\uAAF4\\uAB01-\\uAB06\\uAB09-\\uAB0E\\uAB11-\\uAB16\\uAB20-\\uAB26\\uAB28-\\uAB2E\\uAB30-\\uAB5A\\uAB5C-\\uAB69\\uAB70-\\uABE2\\uAC00-\\uD7A3\\uD7B0-\\uD7C6\\uD7CB-\\uD7FB\\uF900-\\uFA6D\\uFA70-\\uFAD9\\uFB00-\\uFB06\\uFB13-\\uFB17\\uFB1D\\uFB1F-\\uFB28\\uFB2A-\\uFB36\\uFB38-\\uFB3C\\uFB3E\\uFB40\\uFB41\\uFB43\\uFB44\\uFB46-\\uFBB1\\uFBD3-\\uFD3D\\uFD50-\\uFD8F\\uFD92-\\uFDC7\\uFDF0-\\uFDFB\\uFE70-\\uFE74\\uFE76-\\uFEFC\\uFF21-\\uFF3A\\uFF41-\\uFF5A\\uFF66-\\uFFBE\\uFFC2-\\uFFC7\\uFFCA-\\uFFCF\\uFFD2-\\uFFD7\\uFFDA-\\uFFDC]|\\uD800[\\uDC00-\\uDC0B\\uDC0D-\\uDC26\\uDC28-\\uDC3A\\uDC3C\\uDC3D\\uDC3F-\\uDC4D\\uDC50-\\uDC5D\\uDC80-\\uDCFA\\uDD40-\\uDD74\\uDE80-\\uDE9C\\uDEA0-\\uDED0\\uDF00-\\uDF1F\\uDF2D-\\uDF4A\\uDF50-\\uDF75\\uDF80-\\uDF9D\\uDFA0-\\uDFC3\\uDFC8-\\uDFCF\\uDFD1-\\uDFD5]|\\uD801[\\uDC00-\\uDC9D\\uDCB0-\\uDCD3\\uDCD8-\\uDCFB\\uDD00-\\uDD27\\uDD30-\\uDD63\\uDE00-\\uDF36\\uDF40-\\uDF55\\uDF60-\\uDF67]|\\uD802[\\uDC00-\\uDC05\\uDC08\\uDC0A-\\uDC35\\uDC37\\uDC38\\uDC3C\\uDC3F-\\uDC55\\uDC60-\\uDC76\\uDC80-\\uDC9E\\uDCE0-\\uDCF2\\uDCF4\\uDCF5\\uDD00-\\uDD15\\uDD20-\\uDD39\\uDD80-\\uDDB7\\uDDBE\\uDDBF\\uDE00\\uDE10-\\uDE13\\uDE15-\\uDE17\\uDE19-\\uDE35\\uDE60-\\uDE7C\\uDE80-\\uDE9C\\uDEC0-\\uDEC7\\uDEC9-\\uDEE4\\uDF00-\\uDF35\\uDF40-\\uDF55\\uDF60-\\uDF72\\uDF80-\\uDF91]|\\uD803[\\uDC00-\\uDC48\\uDC80-\\uDCB2\\uDCC0-\\uDCF2\\uDD00-\\uDD23\\uDE80-\\uDEA9\\uDEB0\\uDEB1\\uDF00-\\uDF1C\\uDF27\\uDF30-\\uDF45\\uDFB0-\\uDFC4\\uDFE0-\\uDFF6]|\\uD804[\\uDC03-\\uDC37\\uDC83-\\uDCAF\\uDCD0-\\uDCE8\\uDD03-\\uDD26\\uDD44\\uDD47\\uDD50-\\uDD72\\uDD76\\uDD83-\\uDDB2\\uDDC1-\\uDDC4\\uDDDA\\uDDDC\\uDE00-\\uDE11\\uDE13-\\uDE2B\\uDE80-\\uDE86\\uDE88\\uDE8A-\\uDE8D\\uDE8F-\\uDE9D\\uDE9F-\\uDEA8\\uDEB0-\\uDEDE\\uDF05-\\uDF0C\\uDF0F\\uDF10\\uDF13-\\uDF28\\uDF2A-\\uDF30\\uDF32\\uDF33\\uDF35-\\uDF39\\uDF3D\\uDF50\\uDF5D-\\uDF61]|\\uD805[\\uDC00-\\uDC34\\uDC47-\\uDC4A\\uDC5F-\\uDC61\\uDC80-\\uDCAF\\uDCC4\\uDCC5\\uDCC7\\uDD80-\\uDDAE\\uDDD8-\\uDDDB\\uDE00-\\uDE2F\\uDE44\\uDE80-\\uDEAA\\uDEB8\\uDF00-\\uDF1A]|\\uD806[\\uDC00-\\uDC2B\\uDCA0-\\uDCDF\\uDCFF-\\uDD06\\uDD09\\uDD0C-\\uDD13\\uDD15\\uDD16\\uDD18-\\uDD2F\\uDD3F\\uDD41\\uDDA0-\\uDDA7\\uDDAA-\\uDDD0\\uDDE1\\uDDE3\\uDE00\\uDE0B-\\uDE32\\uDE3A\\uDE50\\uDE5C-\\uDE89\\uDE9D\\uDEC0-\\uDEF8]|\\uD807[\\uDC00-\\uDC08\\uDC0A-\\uDC2E\\uDC40\\uDC72-\\uDC8F\\uDD00-\\uDD06\\uDD08\\uDD09\\uDD0B-\\uDD30\\uDD46\\uDD60-\\uDD65\\uDD67\\uDD68\\uDD6A-\\uDD89\\uDD98\\uDEE0-\\uDEF2\\uDFB0]|\\uD808[\\uDC00-\\uDF99]|\\uD809[\\uDC00-\\uDC6E\\uDC80-\\uDD43]|[\\uD80C\\uD81C-\\uD820\\uD822\\uD840-\\uD868\\uD86A-\\uD86C\\uD86F-\\uD872\\uD874-\\uD879\\uD880-\\uD883][\\uDC00-\\uDFFF]|\\uD80D[\\uDC00-\\uDC2E]|\\uD811[\\uDC00-\\uDE46]|\\uD81A[\\uDC00-\\uDE38\\uDE40-\\uDE5E\\uDED0-\\uDEED\\uDF00-\\uDF2F\\uDF40-\\uDF43\\uDF63-\\uDF77\\uDF7D-\\uDF8F]|\\uD81B[\\uDE40-\\uDE7F\\uDF00-\\uDF4A\\uDF50\\uDF93-\\uDF9F\\uDFE0\\uDFE1\\uDFE3]|\\uD821[\\uDC00-\\uDFF7]|\\uD823[\\uDC00-\\uDCD5\\uDD00-\\uDD08]|\\uD82C[\\uDC00-\\uDD1E\\uDD50-\\uDD52\\uDD64-\\uDD67\\uDD70-\\uDEFB]|\\uD82F[\\uDC00-\\uDC6A\\uDC70-\\uDC7C\\uDC80-\\uDC88\\uDC90-\\uDC99]|\\uD835[\\uDC00-\\uDC54\\uDC56-\\uDC9C\\uDC9E\\uDC9F\\uDCA2\\uDCA5\\uDCA6\\uDCA9-\\uDCAC\\uDCAE-\\uDCB9\\uDCBB\\uDCBD-\\uDCC3\\uDCC5-\\uDD05\\uDD07-\\uDD0A\\uDD0D-\\uDD14\\uDD16-\\uDD1C\\uDD1E-\\uDD39\\uDD3B-\\uDD3E\\uDD40-\\uDD44\\uDD46\\uDD4A-\\uDD50\\uDD52-\\uDEA5\\uDEA8-\\uDEC0\\uDEC2-\\uDEDA\\uDEDC-\\uDEFA\\uDEFC-\\uDF14\\uDF16-\\uDF34\\uDF36-\\uDF4E\\uDF50-\\uDF6E\\uDF70-\\uDF88\\uDF8A-\\uDFA8\\uDFAA-\\uDFC2\\uDFC4-\\uDFCB]|\\uD838[\\uDD00-\\uDD2C\\uDD37-\\uDD3D\\uDD4E\\uDEC0-\\uDEEB]|\\uD83A[\\uDC00-\\uDCC4\\uDD00-\\uDD43\\uDD4B]|\\uD83B[\\uDE00-\\uDE03\\uDE05-\\uDE1F\\uDE21\\uDE22\\uDE24\\uDE27\\uDE29-\\uDE32\\uDE34-\\uDE37\\uDE39\\uDE3B\\uDE42\\uDE47\\uDE49\\uDE4B\\uDE4D-\\uDE4F\\uDE51\\uDE52\\uDE54\\uDE57\\uDE59\\uDE5B\\uDE5D\\uDE5F\\uDE61\\uDE62\\uDE64\\uDE67-\\uDE6A\\uDE6C-\\uDE72\\uDE74-\\uDE77\\uDE79-\\uDE7C\\uDE7E\\uDE80-\\uDE89\\uDE8B-\\uDE9B\\uDEA1-\\uDEA3\\uDEA5-\\uDEA9\\uDEAB-\\uDEBB]|\\uD869[\\uDC00-\\uDEDD\\uDF00-\\uDFFF]|\\uD86D[\\uDC00-\\uDF34\\uDF40-\\uDFFF]|\\uD86E[\\uDC00-\\uDC1D\\uDC20-\\uDFFF]|\\uD873[\\uDC00-\\uDEA1\\uDEB0-\\uDFFF]|\\uD87A[\\uDC00-\\uDFE0]|\\uD87E[\\uDC00-\\uDE1D]|\\uD884[\\uDC00-\\uDF4A])");
+  
   /**
     https://www.ecma-international.org/ecma-262/5.1/#sec-7.6
 
@@ -116,15 +172,5 @@ public static final boolean isJavascriptIdentifierStart(int ch) {
       <ZWNJ>
       <ZWJ>
   */
-  public static final boolean isJavascriptIdentifierPart(int ch) {
-    return (fastPathLetters(ch) | fastPathDigits(ch))
-        || (ch === '$' || ch === '_')
-        || JavascriptIdentifierPart
-              .matcher(Character.toString(ch))
-              .matches();
-  }
-  
-  private static final Pattern JavascriptIdentifierStart = Pattern.compile("(?:[\\$A-Z_a-z\\xAA\\xB5\\xBA\\xC0-\\xD6\\xD8-\\xF6\\xF8-\\u02C1\\u02C6-\\u02D1\\u02E0-\\u02E4\\u02EC\\u02EE\\u0370-\\u0374\\u0376\\u0377\\u037A-\\u037D\\u037F\\u0386\\u0388-\\u038A\\u038C\\u038E-\\u03A1\\u03A3-\\u03F5\\u03F7-\\u0481\\u048A-\\u052F\\u0531-\\u0556\\u0559\\u0560-\\u0588\\u05D0-\\u05EA\\u05EF-\\u05F2\\u0620-\\u064A\\u066E\\u066F\\u0671-\\u06D3\\u06D5\\u06E5\\u06E6\\u06EE\\u06EF\\u06FA-\\u06FC\\u06FF\\u0710\\u0712-\\u072F\\u074D-\\u07A5\\u07B1\\u07CA-\\u07EA\\u07F4\\u07F5\\u07FA\\u0800-\\u0815\\u081A\\u0824\\u0828\\u0840-\\u0858\\u0860-\\u086A\\u08A0-\\u08B4\\u08B6-\\u08C7\\u0904-\\u0939\\u093D\\u0950\\u0958-\\u0961\\u0971-\\u0980\\u0985-\\u098C\\u098F\\u0990\\u0993-\\u09A8\\u09AA-\\u09B0\\u09B2\\u09B6-\\u09B9\\u09BD\\u09CE\\u09DC\\u09DD\\u09DF-\\u09E1\\u09F0\\u09F1\\u09FC\\u0A05-\\u0A0A\\u0A0F\\u0A10\\u0A13-\\u0A28\\u0A2A-\\u0A30\\u0A32\\u0A33\\u0A35\\u0A36\\u0A38\\u0A39\\u0A59-\\u0A5C\\u0A5E\\u0A72-\\u0A74\\u0A85-\\u0A8D\\u0A8F-\\u0A91\\u0A93-\\u0AA8\\u0AAA-\\u0AB0\\u0AB2\\u0AB3\\u0AB5-\\u0AB9\\u0ABD\\u0AD0\\u0AE0\\u0AE1\\u0AF9\\u0B05-\\u0B0C\\u0B0F\\u0B10\\u0B13-\\u0B28\\u0B2A-\\u0B30\\u0B32\\u0B33\\u0B35-\\u0B39\\u0B3D\\u0B5C\\u0B5D\\u0B5F-\\u0B61\\u0B71\\u0B83\\u0B85-\\u0B8A\\u0B8E-\\u0B90\\u0B92-\\u0B95\\u0B99\\u0B9A\\u0B9C\\u0B9E\\u0B9F\\u0BA3\\u0BA4\\u0BA8-\\u0BAA\\u0BAE-\\u0BB9\\u0BD0\\u0C05-\\u0C0C\\u0C0E-\\u0C10\\u0C12-\\u0C28\\u0C2A-\\u0C39\\u0C3D\\u0C58-\\u0C5A\\u0C60\\u0C61\\u0C80\\u0C85-\\u0C8C\\u0C8E-\\u0C90\\u0C92-\\u0CA8\\u0CAA-\\u0CB3\\u0CB5-\\u0CB9\\u0CBD\\u0CDE\\u0CE0\\u0CE1\\u0CF1\\u0CF2\\u0D04-\\u0D0C\\u0D0E-\\u0D10\\u0D12-\\u0D3A\\u0D3D\\u0D4E\\u0D54-\\u0D56\\u0D5F-\\u0D61\\u0D7A-\\u0D7F\\u0D85-\\u0D96\\u0D9A-\\u0DB1\\u0DB3-\\u0DBB\\u0DBD\\u0DC0-\\u0DC6\\u0E01-\\u0E30\\u0E32\\u0E33\\u0E40-\\u0E46\\u0E81\\u0E82\\u0E84\\u0E86-\\u0E8A\\u0E8C-\\u0EA3\\u0EA5\\u0EA7-\\u0EB0\\u0EB2\\u0EB3\\u0EBD\\u0EC0-\\u0EC4\\u0EC6\\u0EDC-\\u0EDF\\u0F00\\u0F40-\\u0F47\\u0F49-\\u0F6C\\u0F88-\\u0F8C\\u1000-\\u102A\\u103F\\u1050-\\u1055\\u105A-\\u105D\\u1061\\u1065\\u1066\\u106E-\\u1070\\u1075-\\u1081\\u108E\\u10A0-\\u10C5\\u10C7\\u10CD\\u10D0-\\u10FA\\u10FC-\\u1248\\u124A-\\u124D\\u1250-\\u1256\\u1258\\u125A-\\u125D\\u1260-\\u1288\\u128A-\\u128D\\u1290-\\u12B0\\u12B2-\\u12B5\\u12B8-\\u12BE\\u12C0\\u12C2-\\u12C5\\u12C8-\\u12D6\\u12D8-\\u1310\\u1312-\\u1315\\u1318-\\u135A\\u1380-\\u138F\\u13A0-\\u13F5\\u13F8-\\u13FD\\u1401-\\u166C\\u166F-\\u167F\\u1681-\\u169A\\u16A0-\\u16EA\\u16EE-\\u16F8\\u1700-\\u170C\\u170E-\\u1711\\u1720-\\u1731\\u1740-\\u1751\\u1760-\\u176C\\u176E-\\u1770\\u1780-\\u17B3\\u17D7\\u17DC\\u1820-\\u1878\\u1880-\\u18A8\\u18AA\\u18B0-\\u18F5\\u1900-\\u191E\\u1950-\\u196D\\u1970-\\u1974\\u1980-\\u19AB\\u19B0-\\u19C9\\u1A00-\\u1A16\\u1A20-\\u1A54\\u1AA7\\u1B05-\\u1B33\\u1B45-\\u1B4B\\u1B83-\\u1BA0\\u1BAE\\u1BAF\\u1BBA-\\u1BE5\\u1C00-\\u1C23\\u1C4D-\\u1C4F\\u1C5A-\\u1C7D\\u1C80-\\u1C88\\u1C90-\\u1CBA\\u1CBD-\\u1CBF\\u1CE9-\\u1CEC\\u1CEE-\\u1CF3\\u1CF5\\u1CF6\\u1CFA\\u1D00-\\u1DBF\\u1E00-\\u1F15\\u1F18-\\u1F1D\\u1F20-\\u1F45\\u1F48-\\u1F4D\\u1F50-\\u1F57\\u1F59\\u1F5B\\u1F5D\\u1F5F-\\u1F7D\\u1F80-\\u1FB4\\u1FB6-\\u1FBC\\u1FBE\\u1FC2-\\u1FC4\\u1FC6-\\u1FCC\\u1FD0-\\u1FD3\\u1FD6-\\u1FDB\\u1FE0-\\u1FEC\\u1FF2-\\u1FF4\\u1FF6-\\u1FFC\\u2071\\u207F\\u2090-\\u209C\\u2102\\u2107\\u210A-\\u2113\\u2115\\u2118-\\u211D\\u2124\\u2126\\u2128\\u212A-\\u2139\\u213C-\\u213F\\u2145-\\u2149\\u214E\\u2160-\\u2188\\u2C00-\\u2C2E\\u2C30-\\u2C5E\\u2C60-\\u2CE4\\u2CEB-\\u2CEE\\u2CF2\\u2CF3\\u2D00-\\u2D25\\u2D27\\u2D2D\\u2D30-\\u2D67\\u2D6F\\u2D80-\\u2D96\\u2DA0-\\u2DA6\\u2DA8-\\u2DAE\\u2DB0-\\u2DB6\\u2DB8-\\u2DBE\\u2DC0-\\u2DC6\\u2DC8-\\u2DCE\\u2DD0-\\u2DD6\\u2DD8-\\u2DDE\\u3005-\\u3007\\u3021-\\u3029\\u3031-\\u3035\\u3038-\\u303C\\u3041-\\u3096\\u309B-\\u309F\\u30A1-\\u30FA\\u30FC-\\u30FF\\u3105-\\u312F\\u3131-\\u318E\\u31A0-\\u31BF\\u31F0-\\u31FF\\u3400-\\u4DBF\\u4E00-\\u9FFC\\uA000-\\uA48C\\uA4D0-\\uA4FD\\uA500-\\uA60C\\uA610-\\uA61F\\uA62A\\uA62B\\uA640-\\uA66E\\uA67F-\\uA69D\\uA6A0-\\uA6EF\\uA717-\\uA71F\\uA722-\\uA788\\uA78B-\\uA7BF\\uA7C2-\\uA7CA\\uA7F5-\\uA801\\uA803-\\uA805\\uA807-\\uA80A\\uA80C-\\uA822\\uA840-\\uA873\\uA882-\\uA8B3\\uA8F2-\\uA8F7\\uA8FB\\uA8FD\\uA8FE\\uA90A-\\uA925\\uA930-\\uA946\\uA960-\\uA97C\\uA984-\\uA9B2\\uA9CF\\uA9E0-\\uA9E4\\uA9E6-\\uA9EF\\uA9FA-\\uA9FE\\uAA00-\\uAA28\\uAA40-\\uAA42\\uAA44-\\uAA4B\\uAA60-\\uAA76\\uAA7A\\uAA7E-\\uAAAF\\uAAB1\\uAAB5\\uAAB6\\uAAB9-\\uAABD\\uAAC0\\uAAC2\\uAADB-\\uAADD\\uAAE0-\\uAAEA\\uAAF2-\\uAAF4\\uAB01-\\uAB06\\uAB09-\\uAB0E\\uAB11-\\uAB16\\uAB20-\\uAB26\\uAB28-\\uAB2E\\uAB30-\\uAB5A\\uAB5C-\\uAB69\\uAB70-\\uABE2\\uAC00-\\uD7A3\\uD7B0-\\uD7C6\\uD7CB-\\uD7FB\\uF900-\\uFA6D\\uFA70-\\uFAD9\\uFB00-\\uFB06\\uFB13-\\uFB17\\uFB1D\\uFB1F-\\uFB28\\uFB2A-\\uFB36\\uFB38-\\uFB3C\\uFB3E\\uFB40\\uFB41\\uFB43\\uFB44\\uFB46-\\uFBB1\\uFBD3-\\uFD3D\\uFD50-\\uFD8F\\uFD92-\\uFDC7\\uFDF0-\\uFDFB\\uFE70-\\uFE74\\uFE76-\\uFEFC\\uFF21-\\uFF3A\\uFF41-\\uFF5A\\uFF66-\\uFFBE\\uFFC2-\\uFFC7\\uFFCA-\\uFFCF\\uFFD2-\\uFFD7\\uFFDA-\\uFFDC]|\\uD800[\\uDC00-\\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-  
   private static final Pattern JavascriptIdentifierPart = Pattern.compile("(?:[\\$0-9A-Z_a-z\\xAA\\xB5\\xB7\\xBA\\xC0-\\xD6\\xD8-\\xF6\\xF8-\\u02C1\\u02C6-\\u02D1\\u02E0-\\u02E4\\u02EC\\u02EE\\u0300-\\u0374\\u0376\\u0377\\u037A-\\u037D\\u037F\\u0386-\\u038A\\u038C\\u038E-\\u03A1\\u03A3-\\u03F5\\u03F7-\\u0481\\u0483-\\u0487\\u048A-\\u052F\\u0531-\\u0556\\u0559\\u0560-\\u0588\\u0591-\\u05BD\\u05BF\\u05C1\\u05C2\\u05C4\\u05C5\\u05C7\\u05D0-\\u05EA\\u05EF-\\u05F2\\u0610-\\u061A\\u0620-\\u0669\\u066E-\\u06D3\\u06D5-\\u06DC\\u06DF-\\u06E8\\u06EA-\\u06FC\\u06FF\\u0710-\\u074A\\u074D-\\u07B1\\u07C0-\\u07F5\\u07FA\\u07FD\\u0800-\\u082D\\u0840-\\u085B\\u0860-\\u086A\\u08A0-\\u08B4\\u08B6-\\u08C7\\u08D3-\\u08E1\\u08E3-\\u0963\\u0966-\\u096F\\u0971-\\u0983\\u0985-\\u098C\\u098F\\u0990\\u0993-\\u09A8\\u09AA-\\u09B0\\u09B2\\u09B6-\\u09B9\\u09BC-\\u09C4\\u09C7\\u09C8\\u09CB-\\u09CE\\u09D7\\u09DC\\u09DD\\u09DF-\\u09E3\\u09E6-\\u09F1\\u09FC\\u09FE\\u0A01-\\u0A03\\u0A05-\\u0A0A\\u0A0F\\u0A10\\u0A13-\\u0A28\\u0A2A-\\u0A30\\u0A32\\u0A33\\u0A35\\u0A36\\u0A38\\u0A39\\u0A3C\\u0A3E-\\u0A42\\u0A47\\u0A48\\u0A4B-\\u0A4D\\u0A51\\u0A59-\\u0A5C\\u0A5E\\u0A66-\\u0A75\\u0A81-\\u0A83\\u0A85-\\u0A8D\\u0A8F-\\u0A91\\u0A93-\\u0AA8\\u0AAA-\\u0AB0\\u0AB2\\u0AB3\\u0AB5-\\u0AB9\\u0ABC-\\u0AC5\\u0AC7-\\u0AC9\\u0ACB-\\u0ACD\\u0AD0\\u0AE0-\\u0AE3\\u0AE6-\\u0AEF\\u0AF9-\\u0AFF\\u0B01-\\u0B03\\u0B05-\\u0B0C\\u0B0F\\u0B10\\u0B13-\\u0B28\\u0B2A-\\u0B30\\u0B32\\u0B33\\u0B35-\\u0B39\\u0B3C-\\u0B44\\u0B47\\u0B48\\u0B4B-\\u0B4D\\u0B55-\\u0B57\\u0B5C\\u0B5D\\u0B5F-\\u0B63\\u0B66-\\u0B6F\\u0B71\\u0B82\\u0B83\\u0B85-\\u0B8A\\u0B8E-\\u0B90\\u0B92-\\u0B95\\u0B99\\u0B9A\\u0B9C\\u0B9E\\u0B9F\\u0BA3\\u0BA4\\u0BA8-\\u0BAA\\u0BAE-\\u0BB9\\u0BBE-\\u0BC2\\u0BC6-\\u0BC8\\u0BCA-\\u0BCD\\u0BD0\\u0BD7\\u0BE6-\\u0BEF\\u0C00-\\u0C0C\\u0C0E-\\u0C10\\u0C12-\\u0C28\\u0C2A-\\u0C39\\u0C3D-\\u0C44\\u0C46-\\u0C48\\u0C4A-\\u0C4D\\u0C55\\u0C56\\u0C58-\\u0C5A\\u0C60-\\u0C63\\u0C66-\\u0C6F\\u0C80-\\u0C83\\u0C85-\\u0C8C\\u0C8E-\\u0C90\\u0C92-\\u0CA8\\u0CAA-\\u0CB3\\u0CB5-\\u0CB9\\u0CBC-\\u0CC4\\u0CC6-\\u0CC8\\u0CCA-\\u0CCD\\u0CD5\\u0CD6\\u0CDE\\u0CE0-\\u0CE3\\u0CE6-\\u0CEF\\u0CF1\\u0CF2\\u0D00-\\u0D0C\\u0D0E-\\u0D10\\u0D12-\\u0D44\\u0D46-\\u0D48\\u0D4A-\\u0D4E\\u0D54-\\u0D57\\u0D5F-\\u0D63\\u0D66-\\u0D6F\\u0D7A-\\u0D7F\\u0D81-\\u0D83\\u0D85-\\u0D96\\u0D9A-\\u0DB1\\u0DB3-\\u0DBB\\u0DBD\\u0DC0-\\u0DC6\\u0DCA\\u0DCF-\\u0DD4\\u0DD6\\u0DD8-\\u0DDF\\u0DE6-\\u0DEF\\u0DF2\\u0DF3\\u0E01-\\u0E3A\\u0E40-\\u0E4E\\u0E50-\\u0E59\\u0E81\\u0E82\\u0E84\\u0E86-\\u0E8A\\u0E8C-\\u0EA3\\u0EA5\\u0EA7-\\u0EBD\\u0EC0-\\u0EC4\\u0EC6\\u0EC8-\\u0ECD\\u0ED0-\\u0ED9\\u0EDC-\\u0EDF\\u0F00\\u0F18\\u0F19\\u0F20-\\u0F29\\u0F35\\u0F37\\u0F39\\u0F3E-\\u0F47\\u0F49-\\u0F6C\\u0F71-\\u0F84\\u0F86-\\u0F97\\u0F99-\\u0FBC\\u0FC6\\u1000-\\u1049\\u1050-\\u109D\\u10A0-\\u10C5\\u10C7\\u10CD\\u10D0-\\u10FA\\u10FC-\\u1248\\u124A-\\u124D\\u1250-\\u1256\\u1258\\u125A-\\u125D\\u1260-\\u1288\\u128A-\\u128D\\u1290-\\u12B0\\u12B2-\\u12B5\\u12B8-\\u12BE\\u12C0\\u12C2-\\u12C5\\u12C8-\\u12D6\\u12D8-\\u1310\\u1312-\\u1315\\u1318-\\u135A\\u135D-\\u135F\\u1369-\\u1371\\u1380-\\u138F\\u13A0-\\u13F5\\u13F8-\\u13FD\\u1401-\\u166C\\u166F-\\u167F\\u1681-\\u169A\\u16A0-\\u16EA\\u16EE-\\u16F8\\u1700-\\u170C\\u170E-\\u1714\\u1720-\\u1734\\u1740-\\u1753\\u1760-\\u176C\\u176E-\\u1770\\u1772\\u1773\\u1780-\\u17D3\\u17D7\\u17DC\\u17DD\\u17E0-\\u17E9\\u180B-\\u180D\\u1810-\\u1819\\u1820-\\u1878\\u1880-\\u18AA\\u18B0-\\u18F5\\u1900-\\u191E\\u1920-\\u192B\\u1930-\\u193B\\u1946-\\u196D\\u1970-\\u1974\\u1980-\\u19AB\\u19B0-\\u19C9\\u19D0-\\u19DA\\u1A00-\\u1A1B\\u1A20-\\u1A5E\\u1A60-\\u1A7C\\u1A7F-\\u1A89\\u1A90-\\u1A99\\u1AA7\\u1AB0-\\u1ABD\\u1ABF\\u1AC0\\u1B00-\\u1B4B\\u1B50-\\u1B59\\u1B6B-\\u1B73\\u1B80-\\u1BF3\\u1C00-\\u1C37\\u1C40-\\u1C49\\u1C4D-\\u1C7D\\u1C80-\\u1C88\\u1C90-\\u1CBA\\u1CBD-\\u1CBF\\u1CD0-\\u1CD2\\u1CD4-\\u1CFA\\u1D00-\\u1DF9\\u1DFB-\\u1F15\\u1F18-\\u1F1D\\u1F20-\\u1F45\\u1F48-\\u1F4D\\u1F50-\\u1F57\\u1F59\\u1F5B\\u1F5D\\u1F5F-\\u1F7D\\u1F80-\\u1FB4\\u1FB6-\\u1FBC\\u1FBE\\u1FC2-\\u1FC4\\u1FC6-\\u1FCC\\u1FD0-\\u1FD3\\u1FD6-\\u1FDB\\u1FE0-\\u1FEC\\u1FF2-\\u1FF4\\u1FF6-\\u1FFC\\u200C\\u200D\\u203F\\u2040\\u2054\\u2071\\u207F\\u2090-\\u209C\\u20D0-\\u20DC\\u20E1\\u20E5-\\u20F0\\u2102\\u2107\\u210A-\\u2113\\u2115\\u2118-\\u211D\\u2124\\u2126\\u2128\\u212A-\\u2139\\u213C-\\u213F\\u2145-\\u2149\\u214E\\u2160-\\u2188\\u2C00-\\u2C2E\\u2C30-\\u2C5E\\u2C60-\\u2CE4\\u2CEB-\\u2CF3\\u2D00-\\u2D25\\u2D27\\u2D2D\\u2D30-\\u2D67\\u2D6F\\u2D7F-\\u2D96\\u2DA0-\\u2DA6\\u2DA8-\\u2DAE\\u2DB0-\\u2DB6\\u2DB8-\\u2DBE\\u2DC0-\\u2DC6\\u2DC8-\\u2DCE\\u2DD0-\\u2DD6\\u2DD8-\\u2DDE\\u2DE0-\\u2DFF\\u3005-\\u3007\\u3021-\\u302F\\u3031-\\u3035\\u3038-\\u303C\\u3041-\\u3096\\u3099-\\u309F\\u30A1-\\u30FA\\u30FC-\\u30FF\\u3105-\\u312F\\u3131-\\u318E\\u31A0-\\u31BF\\u31F0-\\u31FF\\u3400-\\u4DBF\\u4E00-\\u9FFC\\uA000-\\uA48C\\uA4D0-\\uA4FD\\uA500-\\uA60C\\uA610-\\uA62B\\uA640-\\uA66F\\uA674-\\uA67D\\uA67F-\\uA6F1\\uA717-\\uA71F\\uA722-\\uA788\\uA78B-\\uA7BF\\uA7C2-\\uA7CA\\uA7F5-\\uA827\\uA82C\\uA840-\\uA873\\uA880-\\uA8C5\\uA8D0-\\uA8D9\\uA8E0-\\uA8F7\\uA8FB\\uA8FD-\\uA92D\\uA930-\\uA953\\uA960-\\uA97C\\uA980-\\uA9C0\\uA9CF-\\uA9D9\\uA9E0-\\uA9FE\\uAA00-\\uAA36\\uAA40-\\uAA4D\\uAA50-\\uAA59\\uAA60-\\uAA76\\uAA7A-\\uAAC2\\uAADB-\\uAADD\\uAAE0-\\uAAEF\\uAAF2-\\uAAF6\\uAB01-\\uAB06\\uAB09-\\uAB0E\\uAB11-\\uAB16\\uAB20-\\uAB26\\uAB28-\\uAB2E\\uAB30-\\uAB5A\\uAB5C-\\uAB69\\uAB70-\\uABEA\\uABEC\\uABED\\uABF0-\\uABF9\\uAC00-\\uD7A3\\uD7B0-\\uD7C6\\uD7CB-\\uD7FB\\uF900-\\uFA6D\\uFA70-\\uFAD9\\uFB00-\\uFB06\\uFB13-\\uFB17\\uFB1D-\\uFB28\\uFB2A-\\uFB36\\uFB38-\\uFB3C\\uFB3E\\uFB40\\uFB41\\uFB43\\uFB44\\uFB46-\\uFBB1\\uFBD3-\\uFD3D\\uFD50-\\uFD8F\\uFD92-\\uFDC7\\uFDF0-\\uFDFB\\uFE00-\\uFE0F\\uFE20-\\uFE2F\\uFE33\\uFE34\\uFE4D-\\uFE4F\\uFE70-\\uFE74\\uFE76-\\uFEFC\\uFF10-\\uFF19\\uFF21-\\uFF3A\\uFF3F\\uFF41-\\uFF5A\\uFF66-\\uFFBE\\uFFC2-\\uFFC7\\uFFCA-\\uFFCF\\uFFD2-\\uFFD7\\uFFDA-\\uFFDC]|\\uD800[\\uDC00-\\uDC0B\\uDC0D-\\uDC26\\uDC28-\\uDC3A\\uDC3C\\uDC3D\\uDC3F-\\uDC4D\\uDC50-\\uDC5D\\uDC80-\\uDCFA\\uDD40-\\uDD74\\uDDFD\\uDE80-\\uDE9C\\uDEA0-\\uDED0\\uDEE0\\uDF00-\\uDF1F\\uDF2D-\\uDF4A\\uDF50-\\uDF7A\\uDF80-\\uDF9D\\uDFA0-\\uDFC3\\uDFC8-\\uDFCF\\uDFD1-\\uDFD5]|\\uD801[\\uDC00-\\uDC9D\\uDCA0-\\uDCA9\\uDCB0-\\uDCD3\\uDCD8-\\uDCFB\\uDD00-\\uDD27\\uDD30-\\uDD63\\uDE00-\\uDF36\\uDF40-\\uDF55\\uDF60-\\uDF67]|\\uD802[\\uDC00-\\uDC05\\uDC08\\uDC0A-\\uDC35\\uDC37\\uDC38\\uDC3C\\uDC3F-\\uDC55\\uDC60-\\uDC76\\uDC80-\\uDC9E\\uDCE0-\\uDCF2\\uDCF4\\uDCF5\\uDD00-\\uDD15\\uDD20-\\uDD39\\uDD80-\\uDDB7\\uDDBE\\uDDBF\\uDE00-\\uDE03\\uDE05\\uDE06\\uDE0C-\\uDE13\\uDE15-\\uDE17\\uDE19-\\uDE35\\uDE38-\\uDE3A\\uDE3F\\uDE60-\\uDE7C\\uDE80-\\uDE9C\\uDEC0-\\uDEC7\\uDEC9-\\uDEE6\\uDF00-\\uDF35\\uDF40-\\uDF55\\uDF60-\\uDF72\\uDF80-\\uDF91]|\\uD803[\\uDC00-\\uDC48\\uDC80-\\uDCB2\\uDCC0-\\uDCF2\\uDD00-\\uDD27\\uDD30-\\uDD39\\uDE80-\\uDEA9\\uDEAB\\uDEAC\\uDEB0\\uDEB1\\uDF00-\\uDF1C\\uDF27\\uDF30-\\uDF50\\uDFB0-\\uDFC4\\uDFE0-\\uDFF6]|\\uD804[\\uDC00-\\uDC46\\uDC66-\\uDC6F\\uDC7F-\\uDCBA\\uDCD0-\\uDCE8\\uDCF0-\\uDCF9\\uDD00-\\uDD34\\uDD36-\\uDD3F\\uDD44-\\uDD47\\uDD50-\\uDD73\\uDD76\\uDD80-\\uDDC4\\uDDC9-\\uDDCC\\uDDCE-\\uDDDA\\uDDDC\\uDE00-\\uDE11\\uDE13-\\uDE37\\uDE3E\\uDE80-\\uDE86\\uDE88\\uDE8A-\\uDE8D\\uDE8F-\\uDE9D\\uDE9F-\\uDEA8\\uDEB0-\\uDEEA\\uDEF0-\\uDEF9\\uDF00-\\uDF03\\uDF05-\\uDF0C\\uDF0F\\uDF10\\uDF13-\\uDF28\\uDF2A-\\uDF30\\uDF32\\uDF33\\uDF35-\\uDF39\\uDF3B-\\uDF44\\uDF47\\uDF48\\uDF4B-\\uDF4D\\uDF50\\uDF57\\uDF5D-\\uDF63\\uDF66-\\uDF6C\\uDF70-\\uDF74]|\\uD805[\\uDC00-\\uDC4A\\uDC50-\\uDC59\\uDC5E-\\uDC61\\uDC80-\\uDCC5\\uDCC7\\uDCD0-\\uDCD9\\uDD80-\\uDDB5\\uDDB8-\\uDDC0\\uDDD8-\\uDDDD\\uDE00-\\uDE40\\uDE44\\uDE50-\\uDE59\\uDE80-\\uDEB8\\uDEC0-\\uDEC9\\uDF00-\\uDF1A\\uDF1D-\\uDF2B\\uDF30-\\uDF39]|\\uD806[\\uDC00-\\uDC3A\\uDCA0-\\uDCE9\\uDCFF-\\uDD06\\uDD09\\uDD0C-\\uDD13\\uDD15\\uDD16\\uDD18-\\uDD35\\uDD37\\uDD38\\uDD3B-\\uDD43\\uDD50-\\uDD59\\uDDA0-\\uDDA7\\uDDAA-\\uDDD7\\uDDDA-\\uDDE1\\uDDE3\\uDDE4\\uDE00-\\uDE3E\\uDE47\\uDE50-\\uDE99\\uDE9D\\uDEC0-\\uDEF8]|\\uD807[\\uDC00-\\uDC08\\uDC0A-\\uDC36\\uDC38-\\uDC40\\uDC50-\\uDC59\\uDC72-\\uDC8F\\uDC92-\\uDCA7\\uDCA9-\\uDCB6\\uDD00-\\uDD06\\uDD08\\uDD09\\uDD0B-\\uDD36\\uDD3A\\uDD3C\\uDD3D\\uDD3F-\\uDD47\\uDD50-\\uDD59\\uDD60-\\uDD65\\uDD67\\uDD68\\uDD6A-\\uDD8E\\uDD90\\uDD91\\uDD93-\\uDD98\\uDDA0-\\uDDA9\\uDEE0-\\uDEF6\\uDFB0]|\\uD808[\\uDC00-\\uDF99]|\\uD809[\\uDC00-\\uDC6E\\uDC80-\\uDD43]|[\\uD80C\\uD81C-\\uD820\\uD822\\uD840-\\uD868\\uD86A-\\uD86C\\uD86F-\\uD872\\uD874-\\uD879\\uD880-\\uD883][\\uDC00-\\uDFFF]|\\uD80D[\\uDC00-\\uDC2E]|\\uD811[\\uDC00-\\uDE46]|\\uD81A[\\uDC00-\\uDE38\\uDE40-\\uDE5E\\uDE60-\\uDE69\\uDED0-\\uDEED\\uDEF0-\\uDEF4\\uDF00-\\uDF36\\uDF40-\\uDF43\\uDF50-\\uDF59\\uDF63-\\uDF77\\uDF7D-\\uDF8F]|\\uD81B[\\uDE40-\\uDE7F\\uDF00-\\uDF4A\\uDF4F-\\uDF87\\uDF8F-\\uDF9F\\uDFE0\\uDFE1\\uDFE3\\uDFE4\\uDFF0\\uDFF1]|\\uD821[\\uDC00-\\uDFF7]|\\uD823[\\uDC00-\\uDCD5\\uDD00-\\uDD08]|\\uD82C[\\uDC00-\\uDD1E\\uDD50-\\uDD52\\uDD64-\\uDD67\\uDD70-\\uDEFB]|\\uD82F[\\uDC00-\\uDC6A\\uDC70-\\uDC7C\\uDC80-\\uDC88\\uDC90-\\uDC99\\uDC9D\\uDC9E]|\\uD834[\\uDD65-\\uDD69\\uDD6D-\\uDD72\\uDD7B-\\uDD82\\uDD85-\\uDD8B\\uDDAA-\\uDDAD\\uDE42-\\uDE44]|\\uD835[\\uDC00-\\uDC54\\uDC56-\\uDC9C\\uDC9E\\uDC9F\\uDCA2\\uDCA5\\uDCA6\\uDCA9-\\uDCAC\\uDCAE-\\uDCB9\\uDCBB\\uDCBD-\\uDCC3\\uDCC5-\\uDD05\\uDD07-\\uDD0A\\uDD0D-\\uDD14\\uDD16-\\uDD1C\\uDD1E-\\uDD39\\uDD3B-\\uDD3E\\uDD40-\\uDD44\\uDD46\\uDD4A-\\uDD50\\uDD52-\\uDEA5\\uDEA8-\\uDEC0\\uDEC2-\\uDEDA\\uDEDC-\\uDEFA\\uDEFC-\\uDF14\\uDF16-\\uDF34\\uDF36-\\uDF4E\\uDF50-\\uDF6E\\uDF70-\\uDF88\\uDF8A-\\uDFA8\\uDFAA-\\uDFC2\\uDFC4-\\uDFCB\\uDFCE-\\uDFFF]|\\uD836[\\uDE00-\\uDE36\\uDE3B-\\uDE6C\\uDE75\\uDE84\\uDE9B-\\uDE9F\\uDEA1-\\uDEAF]|\\uD838[\\uDC00-\\uDC06\\uDC08-\\uDC18\\uDC1B-\\uDC21\\uDC23\\uDC24\\uDC26-\\uDC2A\\uDD00-\\uDD2C\\uDD30-\\uDD3D\\uDD40-\\uDD49\\uDD4E\\uDEC0-\\uDEF9]|\\uD83A[\\uDC00-\\uDCC4\\uDCD0-\\uDCD6\\uDD00-\\uDD4B\\uDD50-\\uDD59]|\\uD83B[\\uDE00-\\uDE03\\uDE05-\\uDE1F\\uDE21\\uDE22\\uDE24\\uDE27\\uDE29-\\uDE32\\uDE34-\\uDE37\\uDE39\\uDE3B\\uDE42\\uDE47\\uDE49\\uDE4B\\uDE4D-\\uDE4F\\uDE51\\uDE52\\uDE54\\uDE57\\uDE59\\uDE5B\\uDE5D\\uDE5F\\uDE61\\uDE62\\uDE64\\uDE67-\\uDE6A\\uDE6C-\\uDE72\\uDE74-\\uDE77\\uDE79-\\uDE7C\\uDE7E\\uDE80-\\uDE89\\uDE8B-\\uDE9B\\uDEA1-\\uDEA3\\uDEA5-\\uDEA9\\uDEAB-\\uDEBB]|\\uD83E[\\uDFF0-\\uDFF9]|\\uD869[\\uDC00-\\uDEDD\\uDF00-\\uDFFF]|\\uD86D[\\uDC00-\\uDF34\\uDF40-\\uDFFF]|\\uD86E[\\uDC00-\\uDC1D\\uDC20-\\uDFFF]|\\uD873[\\uDC00-\\uDEA1\\uDEB0-\\uDFFF]|\\uD87A[\\uDC00-\\uDFE0]|\\uD87E[\\uDC00-\\uDE1D]|\\uD884[\\uDC00-\\uDF4A]|\\uDB40[\\uDD00-\\uDDEF])");
 }
\ No newline at end of file

From 2f69388db7dabae4bb7d03bc1ebaa1e1e158a9e0 Mon Sep 17 00:00:00 2001
From: Christian Lewis <ctjl96@gmail.com>
Date: Wed, 12 Aug 2020 17:15:32 -0500
Subject: [PATCH 21/28] Removed debugging utils/ directory

---
 utils/build.sh | 3 ---
 utils/run.sh   | 4 ----
 2 files changed, 7 deletions(-)
 delete mode 100755 utils/build.sh
 delete mode 100755 utils/run.sh

diff --git a/utils/build.sh b/utils/build.sh
deleted file mode 100755
index 9fdbc64ca32..00000000000
--- a/utils/build.sh
+++ /dev/null
@@ -1,3 +0,0 @@
-#!/bin/bash
-# Build the compiler without GWT.
-mvn -DskipTests -pl externs/pom.xml,pom-main.xml,pom-main-shaded.xml -e
diff --git a/utils/run.sh b/utils/run.sh
deleted file mode 100755
index fc505aa05d7..00000000000
--- a/utils/run.sh
+++ /dev/null
@@ -1,4 +0,0 @@
-#!/bin/bash
-# Run the local build of CC in target/. Make sure to run build.sh before running
-# this script.
-java -jar target/closure-compiler-1.0-SNAPSHOT.jar $@

From dc275d229389b3ac51eb6fc3148b5df74f62a519 Mon Sep 17 00:00:00 2001
From: Christian Lewis <ctjl96@gmail.com>
Date: Wed, 12 Aug 2020 17:19:44 -0500
Subject: [PATCH 22/28] Comment formatting

---
 .../parsing/parser/util/UnicodeMatch.java      | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java b/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
index d62c1237fe8..a4618b090ed 100644
--- a/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
+++ b/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
@@ -59,7 +59,7 @@ private static final boolean fastPathAscii(int ch) {
   @SuppressWarnings("ShortCircuitBoolean")
   private static final boolean fastPathUnicodeLetter(int ch) {
     /**
-     * Intentionally avoiding short circuiting behavior of '||' and '&&'. This
+     * Intentionally avoiding short circuiting behavior of "||" and "&&". This
      * minimizes branches in this code which minimizes branch prediction misses.
      */
     return (
@@ -88,34 +88,34 @@ private static final boolean fastPathUnicodeLetter(int ch) {
   @SuppressWarnings("ShortCircuitBoolean")
   private static final boolean fastPathUnicodeDigit(int ch) {
     /**
-     * Intentionally avoiding short circuiting behavior of '||' and '&&'. This
+     * Intentionally avoiding short circuiting behavior of "||" and "&&". This
      * minimizes branches in this code which minimizes branch prediction misses.
      */
     return '0' <= ch & ch <= '9';
   }
 
   /**
-   * Check if a given character is an ASCII letter, '$' or '_'.
+   * Check if a given character is an ASCII letter, "$" or "_".
    */
   @SuppressWarnings("ShortCircuitBoolean")
   private static final boolean fastPathIdentifierStart(int ch) {
     /**
-     * Intentionally avoiding short circuiting behavior of '||' and '&&'. This
+     * Intentionally avoiding short circuiting behavior of "||" and "&&". This
      * minimizes branches in this code which minimizes branch prediction misses.
      */
     return (
       fastPathUnicodeLetter(ch) |
-      (ch == '$' | ch == '_')
+      (ch == "$" | ch == "_")
     );
   }
 
   /**
-   * Check if a given character is an ASCII letter, digit, '$' or '_'.
+   * Check if a given character is an ASCII letter, digit, "$" or "_".
    */
   @SuppressWarnings("ShortCircuitBoolean")
   private static final boolean fastPathIdentifierPart(int ch) {
     /**
-     * Intentionally avoiding short circuiting behavior of '||' and '&&'. This
+     * Intentionally avoiding short circuiting behavior of "||" and "&&". This
      * minimizes branches in this code which minimizes branch prediction misses.
      */
     return (
@@ -155,8 +155,8 @@ public static final boolean isJavascriptIdentifierPart(int ch) {
     
     IdentifierStart ::
       UnicodeLetter
-      $: Character == '$'
-      _: Character == '_'
+      $: Character == "$"
+      _: Character == "_"
       \ UnicodeEscapeSequence
   */
   private static final Pattern JavascriptIdentifierStart = Pattern.compile("(?:[\\$A-Z_a-z\\xAA\\xB5\\xBA\\xC0-\\xD6\\xD8-\\xF6\\xF8-\\u02C1\\u02C6-\\u02D1\\u02E0-\\u02E4\\u02EC\\u02EE\\u0370-\\u0374\\u0376\\u0377\\u037A-\\u037D\\u037F\\u0386\\u0388-\\u038A\\u038C\\u038E-\\u03A1\\u03A3-\\u03F5\\u03F7-\\u0481\\u048A-\\u052F\\u0531-\\u0556\\u0559\\u0560-\\u0588\\u05D0-\\u05EA\\u05EF-\\u05F2\\u0620-\\u064A\\u066E\\u066F\\u0671-\\u06D3\\u06D5\\u06E5\\u06E6\\u06EE\\u06EF\\u06FA-\\u06FC\\u06FF\\u0710\\u0712-\\u072F\\u074D-\\u07A5\\u07B1\\u07CA-\\u07EA\\u07F4\\u07F5\\u07FA\\u0800-\\u0815\\u081A\\u0824\\u0828\\u0840-\\u0858\\u0860-\\u086A\\u08A0-\\u08B4\\u08B6-\\u08C7\\u0904-\\u0939\\u093D\\u0950\\u0958-\\u0961\\u0971-\\u0980\\u0985-\\u098C\\u098F\\u0990\\u0993-\\u09A8\\u09AA-\\u09B0\\u09B2\\u09B6-\\u09B9\\u09BD\\u09CE\\u09DC\\u09DD\\u09DF-\\u09E1\\u09F0\\u09F1\\u09FC\\u0A05-\\u0A0A\\u0A0F\\u0A10\\u0A13-\\u0A28\\u0A2A-\\u0A30\\u0A32\\u0A33\\u0A35\\u0A36\\u0A38\\u0A39\\u0A59-\\u0A5C\\u0A5E\\u0A72-\\u0A74\\u0A85-\\u0A8D\\u0A8F-\\u0A91\\u0A93-\\u0AA8\\u0AAA-\\u0AB0\\u0AB2\\u0AB3\\u0AB5-\\u0AB9\\u0ABD\\u0AD0\\u0AE0\\u0AE1\\u0AF9\\u0B05-\\u0B0C\\u0B0F\\u0B10\\u0B13-\\u0B28\\u0B2A-\\u0B30\\u0B32\\u0B33\\u0B35-\\u0B39\\u0B3D\\u0B5C\\u0B5D\\u0B5F-\\u0B61\\u0B71\\u0B83\\u0B85-\\u0B8A\\u0B8E-\\u0B90\\u0B92-\\u0B95\\u0B99\\u0B9A\\u0B9C\\u0B9E\\u0B9F\\u0BA3\\u0BA4\\u0BA8-\\u0BAA\\u0BAE-\\u0BB9\\u0BD0\\u0C05-\\u0C0C\\u0C0E-\\u0C10\\u0C12-\\u0C28\\u0C2A-\\u0C39\\u0C3D\\u0C58-\\u0C5A\\u0C60\\u0C61\\u0C80\\u0C85-\\u0C8C\\u0C8E-\\u0C90\\u0C92-\\u0CA8\\u0CAA-\\u0CB3\\u0CB5-\\u0CB9\\u0CBD\\u0CDE\\u0CE0\\u0CE1\\u0CF1\\u0CF2\\u0D04-\\u0D0C\\u0D0E-\\u0D10\\u0D12-\\u0D3A\\u0D3D\\u0D4E\\u0D54-\\u0D56\\u0D5F-\\u0D61\\u0D7A-\\u0D7F\\u0D85-\\u0D96\\u0D9A-\\u0DB1\\u0DB3-\\u0DBB\\u0DBD\\u0DC0-\\u0DC6\\u0E01-\\u0E30\\u0E32\\u0E33\\u0E40-\\u0E46\\u0E81\\u0E82\\u0E84\\u0E86-\\u0E8A\\u0E8C-\\u0EA3\\u0EA5\\u0EA7-\\u0EB0\\u0EB2\\u0EB3\\u0EBD\\u0EC0-\\u0EC4\\u0EC6\\u0EDC-\\u0EDF\\u0F00\\u0F40-\\u0F47\\u0F49-\\u0F6C\\u0F88-\\u0F8C\\u1000-\\u102A\\u103F\\u1050-\\u1055\\u105A-\\u105D\\u1061\\u1065\\u1066\\u106E-\\u1070\\u1075-\\u1081\\u108E\\u10A0-\\u10C5\\u10C7\\u10CD\\u10D0-\\u10FA\\u10FC-\\u1248\\u124A-\\u124D\\u1250-\\u1256\\u1258\\u125A-\\u125D\\u1260-\\u1288\\u128A-\\u128D\\u1290-\\u12B0\\u12B2-\\u12B5\\u12B8-\\u12BE\\u12C0\\u12C2-\\u12C5\\u12C8-\\u12D6\\u12D8-\\u1310\\u1312-\\u1315\\u1318-\\u135A\\u1380-\\u138F\\u13A0-\\u13F5\\u13F8-\\u13FD\\u1401-\\u166C\\u166F-\\u167F\\u1681-\\u169A\\u16A0-\\u16EA\\u16EE-\\u16F8\\u1700-\\u170C\\u170E-\\u1711\\u1720-\\u1731\\u1740-\\u1751\\u1760-\\u176C\\u176E-\\u1770\\u1780-\\u17B3\\u17D7\\u17DC\\u1820-\\u1878\\u1880-\\u18A8\\u18AA\\u18B0-\\u18F5\\u1900-\\u191E\\u1950-\\u196D\\u1970-\\u1974\\u1980-\\u19AB\\u19B0-\\u19C9\\u1A00-\\u1A16\\u1A20-\\u1A54\\u1AA7\\u1B05-\\u1B33\\u1B45-\\u1B4B\\u1B83-\\u1BA0\\u1BAE\\u1BAF\\u1BBA-\\u1BE5\\u1C00-\\u1C23\\u1C4D-\\u1C4F\\u1C5A-\\u1C7D\\u1C80-\\u1C88\\u1C90-\\u1CBA\\u1CBD-\\u1CBF\\u1CE9-\\u1CEC\\u1CEE-\\u1CF3\\u1CF5\\u1CF6\\u1CFA\\u1D00-\\u1DBF\\u1E00-\\u1F15\\u1F18-\\u1F1D\\u1F20-\\u1F45\\u1F48-\\u1F4D\\u1F50-\\u1F57\\u1F59\\u1F5B\\u1F5D\\u1F5F-\\u1F7D\\u1F80-\\u1FB4\\u1FB6-\\u1FBC\\u1FBE\\u1FC2-\\u1FC4\\u1FC6-\\u1FCC\\u1FD0-\\u1FD3\\u1FD6-\\u1FDB\\u1FE0-\\u1FEC\\u1FF2-\\u1FF4\\u1FF6-\\u1FFC\\u2071\\u207F\\u2090-\\u209C\\u2102\\u2107\\u210A-\\u2113\\u2115\\u2118-\\u211D\\u2124\\u2126\\u2128\\u212A-\\u2139\\u213C-\\u213F\\u2145-\\u2149\\u214E\\u2160-\\u2188\\u2C00-\\u2C2E\\u2C30-\\u2C5E\\u2C60-\\u2CE4\\u2CEB-\\u2CEE\\u2CF2\\u2CF3\\u2D00-\\u2D25\\u2D27\\u2D2D\\u2D30-\\u2D67\\u2D6F\\u2D80-\\u2D96\\u2DA0-\\u2DA6\\u2DA8-\\u2DAE\\u2DB0-\\u2DB6\\u2DB8-\\u2DBE\\u2DC0-\\u2DC6\\u2DC8-\\u2DCE\\u2DD0-\\u2DD6\\u2DD8-\\u2DDE\\u3005-\\u3007\\u3021-\\u3029\\u3031-\\u3035\\u3038-\\u303C\\u3041-\\u3096\\u309B-\\u309F\\u30A1-\\u30FA\\u30FC-\\u30FF\\u3105-\\u312F\\u3131-\\u318E\\u31A0-\\u31BF\\u31F0-\\u31FF\\u3400-\\u4DBF\\u4E00-\\u9FFC\\uA000-\\uA48C\\uA4D0-\\uA4FD\\uA500-\\uA60C\\uA610-\\uA61F\\uA62A\\uA62B\\uA640-\\uA66E\\uA67F-\\uA69D\\uA6A0-\\uA6EF\\uA717-\\uA71F\\uA722-\\uA788\\uA78B-\\uA7BF\\uA7C2-\\uA7CA\\uA7F5-\\uA801\\uA803-\\uA805\\uA807-\\uA80A\\uA80C-\\uA822\\uA840-\\uA873\\uA882-\\uA8B3\\uA8F2-\\uA8F7\\uA8FB\\uA8FD\\uA8FE\\uA90A-\\uA925\\uA930-\\uA946\\uA960-\\uA97C\\uA984-\\uA9B2\\uA9CF\\uA9E0-\\uA9E4\\uA9E6-\\uA9EF\\uA9FA-\\uA9FE\\uAA00-\\uAA28\\uAA40-\\uAA42\\uAA44-\\uAA4B\\uAA60-\\uAA76\\uAA7A\\uAA7E-\\uAAAF\\uAAB1\\uAAB5\\uAAB6\\uAAB9-\\uAABD\\uAAC0\\uAAC2\\uAADB-\\uAADD\\uAAE0-\\uAAEA\\uAAF2-\\uAAF4\\uAB01-\\uAB06\\uAB09-\\uAB0E\\uAB11-\\uAB16\\uAB20-\\uAB26\\uAB28-\\uAB2E\\uAB30-\\uAB5A\\uAB5C-\\uAB69\\uAB70-\\uABE2\\uAC00-\\uD7A3\\uD7B0-\\uD7C6\\uD7CB-\\uD7FB\\uF900-\\uFA6D\\uFA70-\\uFAD9\\uFB00-\\uFB06\\uFB13-\\uFB17\\uFB1D\\uFB1F-\\uFB28\\uFB2A-\\uFB36\\uFB38-\\uFB3C\\uFB3E\\uFB40\\uFB41\\uFB43\\uFB44\\uFB46-\\uFBB1\\uFBD3-\\uFD3D\\uFD50-\\uFD8F\\uFD92-\\uFDC7\\uFDF0-\\uFDFB\\uFE70-\\uFE74\\uFE76-\\uFEFC\\uFF21-\\uFF3A\\uFF41-\\uFF5A\\uFF66-\\uFFBE\\uFFC2-\\uFFC7\\uFFCA-\\uFFCF\\uFFD2-\\uFFD7\\uFFDA-\\uFFDC]|\\uD800[\\uDC00-\\uDC0B\\uDC0D-\\uDC26\\uDC28-\\uDC3A\\uDC3C\\uDC3D\\uDC3F-\\uDC4D\\uDC50-\\uDC5D\\uDC80-\\uDCFA\\uDD40-\\uDD74\\uDE80-\\uDE9C\\uDEA0-\\uDED0\\uDF00-\\uDF1F\\uDF2D-\\uDF4A\\uDF50-\\uDF75\\uDF80-\\uDF9D\\uDFA0-\\uDFC3\\uDFC8-\\uDFCF\\uDFD1-\\uDFD5]|\\uD801[\\uDC00-\\uDC9D\\uDCB0-\\uDCD3\\uDCD8-\\uDCFB\\uDD00-\\uDD27\\uDD30-\\uDD63\\uDE00-\\uDF36\\uDF40-\\uDF55\\uDF60-\\uDF67]|\\uD802[\\uDC00-\\uDC05\\uDC08\\uDC0A-\\uDC35\\uDC37\\uDC38\\uDC3C\\uDC3F-\\uDC55\\uDC60-\\uDC76\\uDC80-\\uDC9E\\uDCE0-\\uDCF2\\uDCF4\\uDCF5\\uDD00-\\uDD15\\uDD20-\\uDD39\\uDD80-\\uDDB7\\uDDBE\\uDDBF\\uDE00\\uDE10-\\uDE13\\uDE15-\\uDE17\\uDE19-\\uDE35\\uDE60-\\uDE7C\\uDE80-\\uDE9C\\uDEC0-\\uDEC7\\uDEC9-\\uDEE4\\uDF00-\\uDF35\\uDF40-\\uDF55\\uDF60-\\uDF72\\uDF80-\\uDF91]|\\uD803[\\uDC00-\\uDC48\\uDC80-\\uDCB2\\uDCC0-\\uDCF2\\uDD00-\\uDD23\\uDE80-\\uDEA9\\uDEB0\\uDEB1\\uDF00-\\uDF1C\\uDF27\\uDF30-\\uDF45\\uDFB0-\\uDFC4\\uDFE0-\\uDFF6]|\\uD804[\\uDC03-\\uDC37\\uDC83-\\uDCAF\\uDCD0-\\uDCE8\\uDD03-\\uDD26\\uDD44\\uDD47\\uDD50-\\uDD72\\uDD76\\uDD83-\\uDDB2\\uDDC1-\\uDDC4\\uDDDA\\uDDDC\\uDE00-\\uDE11\\uDE13-\\uDE2B\\uDE80-\\uDE86\\uDE88\\uDE8A-\\uDE8D\\uDE8F-\\uDE9D\\uDE9F-\\uDEA8\\uDEB0-\\uDEDE\\uDF05-\\uDF0C\\uDF0F\\uDF10\\uDF13-\\uDF28\\uDF2A-\\uDF30\\uDF32\\uDF33\\uDF35-\\uDF39\\uDF3D\\uDF50\\uDF5D-\\uDF61]|\\uD805[\\uDC00-\\uDC34\\uDC47-\\uDC4A\\uDC5F-\\uDC61\\uDC80-\\uDCAF\\uDCC4\\uDCC5\\uDCC7\\uDD80-\\uDDAE\\uDDD8-\\uDDDB\\uDE00-\\uDE2F\\uDE44\\uDE80-\\uDEAA\\uDEB8\\uDF00-\\uDF1A]|\\uD806[\\uDC00-\\uDC2B\\uDCA0-\\uDCDF\\uDCFF-\\uDD06\\uDD09\\uDD0C-\\uDD13\\uDD15\\uDD16\\uDD18-\\uDD2F\\uDD3F\\uDD41\\uDDA0-\\uDDA7\\uDDAA-\\uDDD0\\uDDE1\\uDDE3\\uDE00\\uDE0B-\\uDE32\\uDE3A\\uDE50\\uDE5C-\\uDE89\\uDE9D\\uDEC0-\\uDEF8]|\\uD807[\\uDC00-\\uDC08\\uDC0A-\\uDC2E\\uDC40\\uDC72-\\uDC8F\\uDD00-\\uDD06\\uDD08\\uDD09\\uDD0B-\\uDD30\\uDD46\\uDD60-\\uDD65\\uDD67\\uDD68\\uDD6A-\\uDD89\\uDD98\\uDEE0-\\uDEF2\\uDFB0]|\\uD808[\\uDC00-\\uDF99]|\\uD809[\\uDC00-\\uDC6E\\uDC80-\\uDD43]|[\\uD80C\\uD81C-\\uD820\\uD822\\uD840-\\uD868\\uD86A-\\uD86C\\uD86F-\\uD872\\uD874-\\uD879\\uD880-\\uD883][\\uDC00-\\uDFFF]|\\uD80D[\\uDC00-\\uDC2E]|\\uD811[\\uDC00-\\uDE46]|\\uD81A[\\uDC00-\\uDE38\\uDE40-\\uDE5E\\uDED0-\\uDEED\\uDF00-\\uDF2F\\uDF40-\\uDF43\\uDF63-\\uDF77\\uDF7D-\\uDF8F]|\\uD81B[\\uDE40-\\uDE7F\\uDF00-\\uDF4A\\uDF50\\uDF93-\\uDF9F\\uDFE0\\uDFE1\\uDFE3]|\\uD821[\\uDC00-\\uDFF7]|\\uD823[\\uDC00-\\uDCD5\\uDD00-\\uDD08]|\\uD82C[\\uDC00-\\uDD1E\\uDD50-\\uDD52\\uDD64-\\uDD67\\uDD70-\\uDEFB]|\\uD82F[\\uDC00-\\uDC6A\\uDC70-\\uDC7C\\uDC80-\\uDC88\\uDC90-\\uDC99]|\\uD835[\\uDC00-\\uDC54\\uDC56-\\uDC9C\\uDC9E\\uDC9F\\uDCA2\\uDCA5\\uDCA6\\uDCA9-\\uDCAC\\uDCAE-\\uDCB9\\uDCBB\\uDCBD-\\uDCC3\\uDCC5-\\uDD05\\uDD07-\\uDD0A\\uDD0D-\\uDD14\\uDD16-\\uDD1C\\uDD1E-\\uDD39\\uDD3B-\\uDD3E\\uDD40-\\uDD44\\uDD46\\uDD4A-\\uDD50\\uDD52-\\uDEA5\\uDEA8-\\uDEC0\\uDEC2-\\uDEDA\\uDEDC-\\uDEFA\\uDEFC-\\uDF14\\uDF16-\\uDF34\\uDF36-\\uDF4E\\uDF50-\\uDF6E\\uDF70-\\uDF88\\uDF8A-\\uDFA8\\uDFAA-\\uDFC2\\uDFC4-\\uDFCB]|\\uD838[\\uDD00-\\uDD2C\\uDD37-\\uDD3D\\uDD4E\\uDEC0-\\uDEEB]|\\uD83A[\\uDC00-\\uDCC4\\uDD00-\\uDD43\\uDD4B]|\\uD83B[\\uDE00-\\uDE03\\uDE05-\\uDE1F\\uDE21\\uDE22\\uDE24\\uDE27\\uDE29-\\uDE32\\uDE34-\\uDE37\\uDE39\\uDE3B\\uDE42\\uDE47\\uDE49\\uDE4B\\uDE4D-\\uDE4F\\uDE51\\uDE52\\uDE54\\uDE57\\uDE59\\uDE5B\\uDE5D\\uDE5F\\uDE61\\uDE62\\uDE64\\uDE67-\\uDE6A\\uDE6C-\\uDE72\\uDE74-\\uDE77\\uDE79-\\uDE7C\\uDE7E\\uDE80-\\uDE89\\uDE8B-\\uDE9B\\uDEA1-\\uDEA3\\uDEA5-\\uDEA9\\uDEAB-\\uDEBB]|\\uD869[\\uDC00-\\uDEDD\\uDF00-\\uDFFF]|\\uD86D[\\uDC00-\\uDF34\\uDF40-\\uDFFF]|\\uD86E[\\uDC00-\\uDC1D\\uDC20-\\uDFFF]|\\uD873[\\uDC00-\\uDEA1\\uDEB0-\\uDFFF]|\\uD87A[\\uDC00-\\uDFE0]|\\uD87E[\\uDC00-\\uDE1D]|\\uD884[\\uDC00-\\uDF4A])");

From bd26958ce10d9df479c06a431620f9b6d700b6f8 Mon Sep 17 00:00:00 2001
From: Christian Lewis <ctjl96@gmail.com>
Date: Wed, 12 Aug 2020 17:23:54 -0500
Subject: [PATCH 23/28] Fixed string/char error

---
 .../javascript/jscomp/parsing/parser/util/UnicodeMatch.java     | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java b/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
index a4618b090ed..ff1a36b8ff8 100644
--- a/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
+++ b/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
@@ -105,7 +105,7 @@ private static final boolean fastPathIdentifierStart(int ch) {
      */
     return (
       fastPathUnicodeLetter(ch) |
-      (ch == "$" | ch == "_")
+      (ch == '$' | ch == '_')
     );
   }
 

From 5fb993f132f0f269557e634d207a20cb8be3ee31 Mon Sep 17 00:00:00 2001
From: Christian Lewis <ctjl96@gmail.com>
Date: Wed, 12 Aug 2020 17:25:27 -0500
Subject: [PATCH 24/28] Comment formatting

---
 .../javascript/jscomp/parsing/parser/util/UnicodeMatch.java   | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java b/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
index ff1a36b8ff8..988aa0456ac 100644
--- a/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
+++ b/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
@@ -155,8 +155,8 @@ public static final boolean isJavascriptIdentifierPart(int ch) {
     
     IdentifierStart ::
       UnicodeLetter
-      $: Character == "$"
-      _: Character == "_"
+      $
+      _
       \ UnicodeEscapeSequence
   */
   private static final Pattern JavascriptIdentifierStart = Pattern.compile("(?:[\\$A-Z_a-z\\xAA\\xB5\\xBA\\xC0-\\xD6\\xD8-\\xF6\\xF8-\\u02C1\\u02C6-\\u02D1\\u02E0-\\u02E4\\u02EC\\u02EE\\u0370-\\u0374\\u0376\\u0377\\u037A-\\u037D\\u037F\\u0386\\u0388-\\u038A\\u038C\\u038E-\\u03A1\\u03A3-\\u03F5\\u03F7-\\u0481\\u048A-\\u052F\\u0531-\\u0556\\u0559\\u0560-\\u0588\\u05D0-\\u05EA\\u05EF-\\u05F2\\u0620-\\u064A\\u066E\\u066F\\u0671-\\u06D3\\u06D5\\u06E5\\u06E6\\u06EE\\u06EF\\u06FA-\\u06FC\\u06FF\\u0710\\u0712-\\u072F\\u074D-\\u07A5\\u07B1\\u07CA-\\u07EA\\u07F4\\u07F5\\u07FA\\u0800-\\u0815\\u081A\\u0824\\u0828\\u0840-\\u0858\\u0860-\\u086A\\u08A0-\\u08B4\\u08B6-\\u08C7\\u0904-\\u0939\\u093D\\u0950\\u0958-\\u0961\\u0971-\\u0980\\u0985-\\u098C\\u098F\\u0990\\u0993-\\u09A8\\u09AA-\\u09B0\\u09B2\\u09B6-\\u09B9\\u09BD\\u09CE\\u09DC\\u09DD\\u09DF-\\u09E1\\u09F0\\u09F1\\u09FC\\u0A05-\\u0A0A\\u0A0F\\u0A10\\u0A13-\\u0A28\\u0A2A-\\u0A30\\u0A32\\u0A33\\u0A35\\u0A36\\u0A38\\u0A39\\u0A59-\\u0A5C\\u0A5E\\u0A72-\\u0A74\\u0A85-\\u0A8D\\u0A8F-\\u0A91\\u0A93-\\u0AA8\\u0AAA-\\u0AB0\\u0AB2\\u0AB3\\u0AB5-\\u0AB9\\u0ABD\\u0AD0\\u0AE0\\u0AE1\\u0AF9\\u0B05-\\u0B0C\\u0B0F\\u0B10\\u0B13-\\u0B28\\u0B2A-\\u0B30\\u0B32\\u0B33\\u0B35-\\u0B39\\u0B3D\\u0B5C\\u0B5D\\u0B5F-\\u0B61\\u0B71\\u0B83\\u0B85-\\u0B8A\\u0B8E-\\u0B90\\u0B92-\\u0B95\\u0B99\\u0B9A\\u0B9C\\u0B9E\\u0B9F\\u0BA3\\u0BA4\\u0BA8-\\u0BAA\\u0BAE-\\u0BB9\\u0BD0\\u0C05-\\u0C0C\\u0C0E-\\u0C10\\u0C12-\\u0C28\\u0C2A-\\u0C39\\u0C3D\\u0C58-\\u0C5A\\u0C60\\u0C61\\u0C80\\u0C85-\\u0C8C\\u0C8E-\\u0C90\\u0C92-\\u0CA8\\u0CAA-\\u0CB3\\u0CB5-\\u0CB9\\u0CBD\\u0CDE\\u0CE0\\u0CE1\\u0CF1\\u0CF2\\u0D04-\\u0D0C\\u0D0E-\\u0D10\\u0D12-\\u0D3A\\u0D3D\\u0D4E\\u0D54-\\u0D56\\u0D5F-\\u0D61\\u0D7A-\\u0D7F\\u0D85-\\u0D96\\u0D9A-\\u0DB1\\u0DB3-\\u0DBB\\u0DBD\\u0DC0-\\u0DC6\\u0E01-\\u0E30\\u0E32\\u0E33\\u0E40-\\u0E46\\u0E81\\u0E82\\u0E84\\u0E86-\\u0E8A\\u0E8C-\\u0EA3\\u0EA5\\u0EA7-\\u0EB0\\u0EB2\\u0EB3\\u0EBD\\u0EC0-\\u0EC4\\u0EC6\\u0EDC-\\u0EDF\\u0F00\\u0F40-\\u0F47\\u0F49-\\u0F6C\\u0F88-\\u0F8C\\u1000-\\u102A\\u103F\\u1050-\\u1055\\u105A-\\u105D\\u1061\\u1065\\u1066\\u106E-\\u1070\\u1075-\\u1081\\u108E\\u10A0-\\u10C5\\u10C7\\u10CD\\u10D0-\\u10FA\\u10FC-\\u1248\\u124A-\\u124D\\u1250-\\u1256\\u1258\\u125A-\\u125D\\u1260-\\u1288\\u128A-\\u128D\\u1290-\\u12B0\\u12B2-\\u12B5\\u12B8-\\u12BE\\u12C0\\u12C2-\\u12C5\\u12C8-\\u12D6\\u12D8-\\u1310\\u1312-\\u1315\\u1318-\\u135A\\u1380-\\u138F\\u13A0-\\u13F5\\u13F8-\\u13FD\\u1401-\\u166C\\u166F-\\u167F\\u1681-\\u169A\\u16A0-\\u16EA\\u16EE-\\u16F8\\u1700-\\u170C\\u170E-\\u1711\\u1720-\\u1731\\u1740-\\u1751\\u1760-\\u176C\\u176E-\\u1770\\u1780-\\u17B3\\u17D7\\u17DC\\u1820-\\u1878\\u1880-\\u18A8\\u18AA\\u18B0-\\u18F5\\u1900-\\u191E\\u1950-\\u196D\\u1970-\\u1974\\u1980-\\u19AB\\u19B0-\\u19C9\\u1A00-\\u1A16\\u1A20-\\u1A54\\u1AA7\\u1B05-\\u1B33\\u1B45-\\u1B4B\\u1B83-\\u1BA0\\u1BAE\\u1BAF\\u1BBA-\\u1BE5\\u1C00-\\u1C23\\u1C4D-\\u1C4F\\u1C5A-\\u1C7D\\u1C80-\\u1C88\\u1C90-\\u1CBA\\u1CBD-\\u1CBF\\u1CE9-\\u1CEC\\u1CEE-\\u1CF3\\u1CF5\\u1CF6\\u1CFA\\u1D00-\\u1DBF\\u1E00-\\u1F15\\u1F18-\\u1F1D\\u1F20-\\u1F45\\u1F48-\\u1F4D\\u1F50-\\u1F57\\u1F59\\u1F5B\\u1F5D\\u1F5F-\\u1F7D\\u1F80-\\u1FB4\\u1FB6-\\u1FBC\\u1FBE\\u1FC2-\\u1FC4\\u1FC6-\\u1FCC\\u1FD0-\\u1FD3\\u1FD6-\\u1FDB\\u1FE0-\\u1FEC\\u1FF2-\\u1FF4\\u1FF6-\\u1FFC\\u2071\\u207F\\u2090-\\u209C\\u2102\\u2107\\u210A-\\u2113\\u2115\\u2118-\\u211D\\u2124\\u2126\\u2128\\u212A-\\u2139\\u213C-\\u213F\\u2145-\\u2149\\u214E\\u2160-\\u2188\\u2C00-\\u2C2E\\u2C30-\\u2C5E\\u2C60-\\u2CE4\\u2CEB-\\u2CEE\\u2CF2\\u2CF3\\u2D00-\\u2D25\\u2D27\\u2D2D\\u2D30-\\u2D67\\u2D6F\\u2D80-\\u2D96\\u2DA0-\\u2DA6\\u2DA8-\\u2DAE\\u2DB0-\\u2DB6\\u2DB8-\\u2DBE\\u2DC0-\\u2DC6\\u2DC8-\\u2DCE\\u2DD0-\\u2DD6\\u2DD8-\\u2DDE\\u3005-\\u3007\\u3021-\\u3029\\u3031-\\u3035\\u3038-\\u303C\\u3041-\\u3096\\u309B-\\u309F\\u30A1-\\u30FA\\u30FC-\\u30FF\\u3105-\\u312F\\u3131-\\u318E\\u31A0-\\u31BF\\u31F0-\\u31FF\\u3400-\\u4DBF\\u4E00-\\u9FFC\\uA000-\\uA48C\\uA4D0-\\uA4FD\\uA500-\\uA60C\\uA610-\\uA61F\\uA62A\\uA62B\\uA640-\\uA66E\\uA67F-\\uA69D\\uA6A0-\\uA6EF\\uA717-\\uA71F\\uA722-\\uA788\\uA78B-\\uA7BF\\uA7C2-\\uA7CA\\uA7F5-\\uA801\\uA803-\\uA805\\uA807-\\uA80A\\uA80C-\\uA822\\uA840-\\uA873\\uA882-\\uA8B3\\uA8F2-\\uA8F7\\uA8FB\\uA8FD\\uA8FE\\uA90A-\\uA925\\uA930-\\uA946\\uA960-\\uA97C\\uA984-\\uA9B2\\uA9CF\\uA9E0-\\uA9E4\\uA9E6-\\uA9EF\\uA9FA-\\uA9FE\\uAA00-\\uAA28\\uAA40-\\uAA42\\uAA44-\\uAA4B\\uAA60-\\uAA76\\uAA7A\\uAA7E-\\uAAAF\\uAAB1\\uAAB5\\uAAB6\\uAAB9-\\uAABD\\uAAC0\\uAAC2\\uAADB-\\uAADD\\uAAE0-\\uAAEA\\uAAF2-\\uAAF4\\uAB01-\\uAB06\\uAB09-\\uAB0E\\uAB11-\\uAB16\\uAB20-\\uAB26\\uAB28-\\uAB2E\\uAB30-\\uAB5A\\uAB5C-\\uAB69\\uAB70-\\uABE2\\uAC00-\\uD7A3\\uD7B0-\\uD7C6\\uD7CB-\\uD7FB\\uF900-\\uFA6D\\uFA70-\\uFAD9\\uFB00-\\uFB06\\uFB13-\\uFB17\\uFB1D\\uFB1F-\\uFB28\\uFB2A-\\uFB36\\uFB38-\\uFB3C\\uFB3E\\uFB40\\uFB41\\uFB43\\uFB44\\uFB46-\\uFBB1\\uFBD3-\\uFD3D\\uFD50-\\uFD8F\\uFD92-\\uFDC7\\uFDF0-\\uFDFB\\uFE70-\\uFE74\\uFE76-\\uFEFC\\uFF21-\\uFF3A\\uFF41-\\uFF5A\\uFF66-\\uFFBE\\uFFC2-\\uFFC7\\uFFCA-\\uFFCF\\uFFD2-\\uFFD7\\uFFDA-\\uFFDC]|\\uD800[\\uDC00-\\uDC0B\\uDC0D-\\uDC26\\uDC28-\\uDC3A\\uDC3C\\uDC3D\\uDC3F-\\uDC4D\\uDC50-\\uDC5D\\uDC80-\\uDCFA\\uDD40-\\uDD74\\uDE80-\\uDE9C\\uDEA0-\\uDED0\\uDF00-\\uDF1F\\uDF2D-\\uDF4A\\uDF50-\\uDF75\\uDF80-\\uDF9D\\uDFA0-\\uDFC3\\uDFC8-\\uDFCF\\uDFD1-\\uDFD5]|\\uD801[\\uDC00-\\uDC9D\\uDCB0-\\uDCD3\\uDCD8-\\uDCFB\\uDD00-\\uDD27\\uDD30-\\uDD63\\uDE00-\\uDF36\\uDF40-\\uDF55\\uDF60-\\uDF67]|\\uD802[\\uDC00-\\uDC05\\uDC08\\uDC0A-\\uDC35\\uDC37\\uDC38\\uDC3C\\uDC3F-\\uDC55\\uDC60-\\uDC76\\uDC80-\\uDC9E\\uDCE0-\\uDCF2\\uDCF4\\uDCF5\\uDD00-\\uDD15\\uDD20-\\uDD39\\uDD80-\\uDDB7\\uDDBE\\uDDBF\\uDE00\\uDE10-\\uDE13\\uDE15-\\uDE17\\uDE19-\\uDE35\\uDE60-\\uDE7C\\uDE80-\\uDE9C\\uDEC0-\\uDEC7\\uDEC9-\\uDEE4\\uDF00-\\uDF35\\uDF40-\\uDF55\\uDF60-\\uDF72\\uDF80-\\uDF91]|\\uD803[\\uDC00-\\uDC48\\uDC80-\\uDCB2\\uDCC0-\\uDCF2\\uDD00-\\uDD23\\uDE80-\\uDEA9\\uDEB0\\uDEB1\\uDF00-\\uDF1C\\uDF27\\uDF30-\\uDF45\\uDFB0-\\uDFC4\\uDFE0-\\uDFF6]|\\uD804[\\uDC03-\\uDC37\\uDC83-\\uDCAF\\uDCD0-\\uDCE8\\uDD03-\\uDD26\\uDD44\\uDD47\\uDD50-\\uDD72\\uDD76\\uDD83-\\uDDB2\\uDDC1-\\uDDC4\\uDDDA\\uDDDC\\uDE00-\\uDE11\\uDE13-\\uDE2B\\uDE80-\\uDE86\\uDE88\\uDE8A-\\uDE8D\\uDE8F-\\uDE9D\\uDE9F-\\uDEA8\\uDEB0-\\uDEDE\\uDF05-\\uDF0C\\uDF0F\\uDF10\\uDF13-\\uDF28\\uDF2A-\\uDF30\\uDF32\\uDF33\\uDF35-\\uDF39\\uDF3D\\uDF50\\uDF5D-\\uDF61]|\\uD805[\\uDC00-\\uDC34\\uDC47-\\uDC4A\\uDC5F-\\uDC61\\uDC80-\\uDCAF\\uDCC4\\uDCC5\\uDCC7\\uDD80-\\uDDAE\\uDDD8-\\uDDDB\\uDE00-\\uDE2F\\uDE44\\uDE80-\\uDEAA\\uDEB8\\uDF00-\\uDF1A]|\\uD806[\\uDC00-\\uDC2B\\uDCA0-\\uDCDF\\uDCFF-\\uDD06\\uDD09\\uDD0C-\\uDD13\\uDD15\\uDD16\\uDD18-\\uDD2F\\uDD3F\\uDD41\\uDDA0-\\uDDA7\\uDDAA-\\uDDD0\\uDDE1\\uDDE3\\uDE00\\uDE0B-\\uDE32\\uDE3A\\uDE50\\uDE5C-\\uDE89\\uDE9D\\uDEC0-\\uDEF8]|\\uD807[\\uDC00-\\uDC08\\uDC0A-\\uDC2E\\uDC40\\uDC72-\\uDC8F\\uDD00-\\uDD06\\uDD08\\uDD09\\uDD0B-\\uDD30\\uDD46\\uDD60-\\uDD65\\uDD67\\uDD68\\uDD6A-\\uDD89\\uDD98\\uDEE0-\\uDEF2\\uDFB0]|\\uD808[\\uDC00-\\uDF99]|\\uD809[\\uDC00-\\uDC6E\\uDC80-\\uDD43]|[\\uD80C\\uD81C-\\uD820\\uD822\\uD840-\\uD868\\uD86A-\\uD86C\\uD86F-\\uD872\\uD874-\\uD879\\uD880-\\uD883][\\uDC00-\\uDFFF]|\\uD80D[\\uDC00-\\uDC2E]|\\uD811[\\uDC00-\\uDE46]|\\uD81A[\\uDC00-\\uDE38\\uDE40-\\uDE5E\\uDED0-\\uDEED\\uDF00-\\uDF2F\\uDF40-\\uDF43\\uDF63-\\uDF77\\uDF7D-\\uDF8F]|\\uD81B[\\uDE40-\\uDE7F\\uDF00-\\uDF4A\\uDF50\\uDF93-\\uDF9F\\uDFE0\\uDFE1\\uDFE3]|\\uD821[\\uDC00-\\uDFF7]|\\uD823[\\uDC00-\\uDCD5\\uDD00-\\uDD08]|\\uD82C[\\uDC00-\\uDD1E\\uDD50-\\uDD52\\uDD64-\\uDD67\\uDD70-\\uDEFB]|\\uD82F[\\uDC00-\\uDC6A\\uDC70-\\uDC7C\\uDC80-\\uDC88\\uDC90-\\uDC99]|\\uD835[\\uDC00-\\uDC54\\uDC56-\\uDC9C\\uDC9E\\uDC9F\\uDCA2\\uDCA5\\uDCA6\\uDCA9-\\uDCAC\\uDCAE-\\uDCB9\\uDCBB\\uDCBD-\\uDCC3\\uDCC5-\\uDD05\\uDD07-\\uDD0A\\uDD0D-\\uDD14\\uDD16-\\uDD1C\\uDD1E-\\uDD39\\uDD3B-\\uDD3E\\uDD40-\\uDD44\\uDD46\\uDD4A-\\uDD50\\uDD52-\\uDEA5\\uDEA8-\\uDEC0\\uDEC2-\\uDEDA\\uDEDC-\\uDEFA\\uDEFC-\\uDF14\\uDF16-\\uDF34\\uDF36-\\uDF4E\\uDF50-\\uDF6E\\uDF70-\\uDF88\\uDF8A-\\uDFA8\\uDFAA-\\uDFC2\\uDFC4-\\uDFCB]|\\uD838[\\uDD00-\\uDD2C\\uDD37-\\uDD3D\\uDD4E\\uDEC0-\\uDEEB]|\\uD83A[\\uDC00-\\uDCC4\\uDD00-\\uDD43\\uDD4B]|\\uD83B[\\uDE00-\\uDE03\\uDE05-\\uDE1F\\uDE21\\uDE22\\uDE24\\uDE27\\uDE29-\\uDE32\\uDE34-\\uDE37\\uDE39\\uDE3B\\uDE42\\uDE47\\uDE49\\uDE4B\\uDE4D-\\uDE4F\\uDE51\\uDE52\\uDE54\\uDE57\\uDE59\\uDE5B\\uDE5D\\uDE5F\\uDE61\\uDE62\\uDE64\\uDE67-\\uDE6A\\uDE6C-\\uDE72\\uDE74-\\uDE77\\uDE79-\\uDE7C\\uDE7E\\uDE80-\\uDE89\\uDE8B-\\uDE9B\\uDEA1-\\uDEA3\\uDEA5-\\uDEA9\\uDEAB-\\uDEBB]|\\uD869[\\uDC00-\\uDEDD\\uDF00-\\uDFFF]|\\uD86D[\\uDC00-\\uDF34\\uDF40-\\uDFFF]|\\uD86E[\\uDC00-\\uDC1D\\uDC20-\\uDFFF]|\\uD873[\\uDC00-\\uDEA1\\uDEB0-\\uDFFF]|\\uD87A[\\uDC00-\\uDFE0]|\\uD87E[\\uDC00-\\uDE1D]|\\uD884[\\uDC00-\\uDF4A])");

From 8ab20b7c670c49b69851f8540874465b841898f3 Mon Sep 17 00:00:00 2001
From: Christian Lewis <ctjl96@gmail.com>
Date: Wed, 12 Aug 2020 17:32:49 -0500
Subject: [PATCH 25/28] Committing changes before push to remote.

---
 .../jscomp/parsing/parser/util/UnicodeMatch.java      | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java b/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
index 988aa0456ac..58ed1a64492 100644
--- a/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
+++ b/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
@@ -45,6 +45,8 @@ private static final boolean fastPathAscii(int ch) {
   }
 
   /**
+   * FAST PATHS
+   * 
    * These fast paths are broken into distinct parts because of the logical
    * differences in `IdentifierStart` and `IdentifierPart`, where the former
    * does not accept a digit.
@@ -124,6 +126,15 @@ private static final boolean fastPathIdentifierPart(int ch) {
     );
   }
 
+  /**
+   * PUBLIC IDENTIFIER CHECKS
+   * 
+   * These public methods use the fast paths to check if the given character is
+   * a commonly-used `IdentifierStart` or `IdentifierPart`. If no match is
+   * found, the character is evaluated against the regexpu-transpiled patterns
+   * provided by TC39.
+   */
+
   /**
    * Check if a character is a valid ECMAScript `IdentifierStart`. Check the
    * fast path first, and then fall back to regex.

From cb50fe192cca9c0716677ac34874baa99f3d797b Mon Sep 17 00:00:00 2001
From: Christian Lewis <ctjl96@gmail.com>
Date: Wed, 12 Aug 2020 17:55:12 -0500
Subject: [PATCH 26/28] Explicit typecast to char for `Character.toString()`

---
 .../javascript/jscomp/parsing/parser/util/UnicodeMatch.java   | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java b/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
index 58ed1a64492..2bded9697be 100644
--- a/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
+++ b/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
@@ -143,7 +143,7 @@ public static final boolean isJavascriptIdentifierStart(int ch) {
     return (
         fastPathIdentifierStart(ch) ||
         JavascriptIdentifierStart
-            .matcher(Character.toString(ch))
+            .matcher(Character.toString((char) ch))
             .matches()
     );
   }
@@ -156,7 +156,7 @@ public static final boolean isJavascriptIdentifierPart(int ch) {
     return (
         fastPathIdentifierPart(ch) ||
         JavascriptIdentifierPart
-            .matcher(Character.toString(ch))
+            .matcher(Character.toString((char) ch))
             .matches()
     );
   }

From 469265f47998edf5f6c500abab70ebbcc17be0fb Mon Sep 17 00:00:00 2001
From: Christian Lewis <ctjl96@gmail.com>
Date: Wed, 12 Aug 2020 18:20:10 -0500
Subject: [PATCH 27/28] Updated fast paths for ASCII optimization

---
 .../parsing/parser/util/UnicodeMatch.java     | 45 +++++++------------
 1 file changed, 16 insertions(+), 29 deletions(-)

diff --git a/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java b/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
index 2bded9697be..0c1d62659a0 100644
--- a/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
+++ b/src/com/google/javascript/jscomp/parsing/parser/util/UnicodeMatch.java
@@ -37,13 +37,6 @@
 public final class UnicodeMatch {
   private UnicodeMatch() {}
 
-  /**
-   * Check if a given character is an ASCII character.
-   */
-  private static final boolean fastPathAscii(int ch) {
-    return ch <= 127;
-  }
-
   /**
    * FAST PATHS
    * 
@@ -56,7 +49,7 @@ private static final boolean fastPathAscii(int ch) {
    */
 
   /**
-   * Check if a given character is an ASCII letter.
+   * Fast path to check if a given character is a non-ASCII Unicode letter.
    */
   @SuppressWarnings("ShortCircuitBoolean")
   private static final boolean fastPathUnicodeLetter(int ch) {
@@ -65,8 +58,6 @@ private static final boolean fastPathUnicodeLetter(int ch) {
      * minimizes branches in this code which minimizes branch prediction misses.
      */
     return (
-      ('A' <= ch & ch <= 'Z') |
-      ('a' <= ch & ch <= 'z') |
       // Latin letters
       (0x00C0 <= ch & ch <= 0x00D6) |
       // Latin letters
@@ -84,35 +75,31 @@ private static final boolean fastPathUnicodeLetter(int ch) {
     );
   }
 
-  /** 
-   * Check if a given character is an ASCII digit.
-   */
-  @SuppressWarnings("ShortCircuitBoolean")
-  private static final boolean fastPathUnicodeDigit(int ch) {
-    /**
-     * Intentionally avoiding short circuiting behavior of "||" and "&&". This
-     * minimizes branches in this code which minimizes branch prediction misses.
-     */
-    return '0' <= ch & ch <= '9';
-  }
-
   /**
-   * Check if a given character is an ASCII letter, "$" or "_".
+   * Fast path to check if a given character is a Unicode letter, "$" or "_".
    */
   @SuppressWarnings("ShortCircuitBoolean")
   private static final boolean fastPathIdentifierStart(int ch) {
     /**
+     * ASCII optimization. If ASCII character does not match /[a-z]/i, it is not
+     * a valid `IdentifierStart`.
+     * 
      * Intentionally avoiding short circuiting behavior of "||" and "&&". This
      * minimizes branches in this code which minimizes branch prediction misses.
      */
-    return (
-      fastPathUnicodeLetter(ch) |
-      (ch == '$' | ch == '_')
-    );
+    if (ch <= 127) {
+      return (
+        (ch >= 'A' & ch <= 'Z') |
+        (ch >= 'a' & ch <= 'z') |
+        (ch == '$' | ch == '_')
+      );
+    }
+
+    return fastPathUnicodeLetter(ch);
   }
 
   /**
-   * Check if a given character is an ASCII letter, digit, "$" or "_".
+   * Fast path to check if a given character is an `IdentifierStart` or a digit.
    */
   @SuppressWarnings("ShortCircuitBoolean")
   private static final boolean fastPathIdentifierPart(int ch) {
@@ -122,7 +109,7 @@ private static final boolean fastPathIdentifierPart(int ch) {
      */
     return (
       fastPathIdentifierStart(ch) |
-      fastPathUnicodeDigit(ch)
+      '0' <= ch & ch <= '9'
     );
   }
 

From 6d9f04e51ef30881a21db2c5471ec34366f45604 Mon Sep 17 00:00:00 2001
From: Christian Lewis <ctjl96@gmail.com>
Date: Wed, 12 Aug 2020 18:20:53 -0500
Subject: [PATCH 28/28] Comment formatting

---
 src/com/google/javascript/jscomp/parsing/parser/Scanner.java | 1 -
 1 file changed, 1 deletion(-)

diff --git a/src/com/google/javascript/jscomp/parsing/parser/Scanner.java b/src/com/google/javascript/jscomp/parsing/parser/Scanner.java
index 6b12142e95b..b5138399d74 100644
--- a/src/com/google/javascript/jscomp/parsing/parser/Scanner.java
+++ b/src/com/google/javascript/jscomp/parsing/parser/Scanner.java
@@ -22,7 +22,6 @@
 import com.google.javascript.jscomp.parsing.parser.util.ErrorReporter;
 import com.google.javascript.jscomp.parsing.parser.util.SourcePosition;
 import com.google.javascript.jscomp.parsing.parser.util.SourceRange;
-
 import com.google.javascript.jscomp.parsing.parser.util.UnicodeMatch;
 
 import java.util.ArrayList;