Revert "Bump Swift version"

.gitignore

@@ -10,5 +10,3 @@
 /.build
 /Packages
 /*.xcodeproj
-.swiftpm
-Package.resolved

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version:5.3
+// swift-tools-version:4.2
 /*
  This source file is part of the Swift.org open source project
 
@@ -25,21 +25,13 @@ let package = Package(
     targets: [
         .target(
             name: "Markdown",
-            dependencies: [
-                "CAtomic",
-                .product(name: "cmark-gfm", package: "swift-cmark"),
-                .product(name: "cmark-gfm-extensions", package: "swift-cmark"),
-            ]),
+            dependencies: ["cmark-gfm", "cmark-gfm-extensions", "CAtomic"]),
         .target(
             name: "markdown-tool",
-            dependencies: [
-                "Markdown",
-                .product(name: "ArgumentParser", package: "swift-argument-parser")
-            ]),
+            dependencies: ["Markdown", .product(name: "ArgumentParser", package: "swift-argument-parser")]),
         .testTarget(
             name: "MarkdownTests",
-            dependencies: ["Markdown"],
-            resources: [.process("Visitors/Everything.md")]),
+            dependencies: ["Markdown"]),
         .target(name: "CAtomic"),
     ]
 )

Tests/MarkdownTests/Visitors/Everything.md

@@ -13,19 +13,15 @@
 > BlockQuote
 
 ```swift
-func foo() {
-    let x = 1
-}
+func foo() { let x = 1 }
 ```
 
-    // Is this real code? Or just fantasy?
-
 This is an <topic://autolink>.
 
 ---
 
 <a href="foo.png">
-An HTML Block.
+  An HTML Block.
 </a>
 
 This is some <p>inline html</p>.

Tests/MarkdownTests/Visitors/MarkupRewriterTests.swift

@@ -12,7 +12,45 @@ import XCTest
 @testable import Markdown
 
 /// A `Document` that has every kind of element in it at least once.
-let everythingDocument = Document(parsing: try! String(contentsOf: Bundle.module.url(forResource: "Everything", withExtension: "md")!))
+let everythingDocument = Document(parsing: """
+        # Header
+
+        *Emphasized* **strong** `inline code` [link](foo) ![image](foo).
+
+        - this
+        - is
+        - a
+        - list
+
+        1. eggs
+        1. milk
+
+        > BlockQuote 
+
+        ```swift
+        func foo() {
+            let x = 1
+        }
+        ```
+
+            // Is this real code? Or just fantasy?
+
+        This is an <topic://autolink>.
+
+        ---
+
+        <a href="foo.png">
+        An HTML Block.
+        </a>
+
+        This is some <p>inline html</p>.
+
+        line  
+        break
+
+        soft
+        break
+        """)
 
 
 class MarkupRewriterTests: XCTestCase {

Tests/MarkdownTests/Visitors/MarkupTreeDumperTests.swift

@@ -14,7 +14,7 @@ import XCTest
 final class MarkupTreeDumperTests: XCTestCase {
     func testDumpEverything() {
         let expectedDump = """
-        Document @1:1-39:90 Root #\(everythingDocument.raw.metadata.id.rootId) #0
+        Document @1:1-37:6 Root #\(everythingDocument.raw.metadata.id.rootId) #0
         ├─ Heading @1:1-1:9 #1 level: 1
         │  └─ Text @1:3-1:9 #2 "Header"
         ├─ Paragraph @3:1-3:65 #3
@@ -52,8 +52,8 @@ final class MarkupTreeDumperTests: XCTestCase {
         │  └─ ListItem @11:1-12:1 #35
         │     └─ Paragraph @11:4-11:8 #36
         │        └─ Text @11:4-11:8 #37 "milk"
-        ├─ BlockQuote @13:1-13:13 #38
-        │  └─ Paragraph @13:3-13:13 #39
+        ├─ BlockQuote @13:1-13:14 #38
+        │  └─ Paragraph @13:3-13:14 #39
         │     └─ Text @13:3-13:13 #40 "BlockQuote"
         ├─ CodeBlock @15:1-19:4 #41 language: swift
         │  func foo() {
@@ -81,12 +81,10 @@ final class MarkupTreeDumperTests: XCTestCase {
         │  ├─ Text @33:1-33:7 #57 "line"
         │  ├─ LineBreak #58
         │  └─ Text @34:1-34:6 #59 "break"
-        ├─ Paragraph @36:1-37:6 #60
-        │  ├─ Text @36:1-36:5 #61 "soft"
-        │  ├─ SoftBreak #62
-        │  └─ Text @37:1-37:6 #63 "break"
-        └─ HTMLBlock @39:1-39:90 #64
-           <!-- Copyright (c) 2021 Apple Inc and the Swift Project authors. All Rights Reserved. -->
+        └─ Paragraph @36:1-37:6 #60
+           ├─ Text @36:1-36:5 #61 "soft"
+           ├─ SoftBreak #62
+           └─ Text @37:1-37:6 #63 "break"
         """
         print(everythingDocument.debugDescription(options: [.printEverything]))
         XCTAssertEqual(expectedDump, everythingDocument.debugDescription(options: [.printEverything]))

bin/check-source

@@ -49,7 +49,7 @@ for language in swift-or-c bash md-or-tutorial html docker; do
   reader=head
   case "$language" in
       swift-or-c)
-        exceptions=( -name 'Package*.swift')
+        exceptions=( -name Package.swift)
         matching_files=( -name '*.swift' -o -name '*.c' -o -name '*.h' )
         cat > "$tmp" <<"EOF"
 /*