GH-548 Format Failures

Author: dzikoysk

examples/tests/current_test.panda

@@ -175,7 +175,7 @@ main {
     CustomThread thread = new CustomThread()
     thread.start()
 
-    // Runnable runnable = { log 'x' }
+    Runnable runnable = { log 'x' }
 }
 
 // simple interface

panda-framework/src/main/java/org/panda_lang/language/Failure.java

@@ -16,6 +16,7 @@
 
 package org.panda_lang.language;
 
+import org.jetbrains.annotations.Nullable;
 import org.panda_lang.language.interpreter.source.IndicatedSource;
 import org.panda_lang.utilities.commons.function.Option;
 
@@ -38,4 +39,27 @@ public interface Failure {
      */
     Option<String> getNote();
 
+    /**
+     * Returns the cause of this throwable or {@code null} if the
+     * cause is nonexistent or unknown. (The cause is the throwable that
+     * caused this throwable to get thrown.)
+     *
+     * @return the cause
+     */
+    @Nullable Throwable getCause();
+
+    /**
+     * Get failure message
+     *
+     * @return the failure message
+     */
+    String getMessage();
+
+    /**
+     * Get failure stacktrace
+     *
+     * @return the array of stack trace elements
+     */
+    StackTraceElement[] getStackTrace();
+
 }

panda-framework/src/main/java/org/panda_lang/language/interpreter/logging/FailureListener.java

@@ -17,7 +17,14 @@
 package org.panda_lang.language.interpreter.logging;
 
 import org.panda_lang.language.Failure;
+import org.panda_lang.language.PandaFrameworkConstants;
+import org.panda_lang.language.interpreter.source.IndicatedSource;
+import org.panda_lang.language.interpreter.source.Location;
+import org.panda_lang.language.interpreter.token.Snippet;
+import org.panda_lang.language.interpreter.token.Snippetable;
 import org.panda_lang.utilities.commons.StackTraceUtils;
+import org.panda_lang.utilities.commons.StringUtils;
+import org.panda_lang.utilities.commons.console.Colored;
 import org.panda_lang.utilities.commons.console.Effect;
 
 public final class SystemLogger implements Logger {
@@ -49,26 +56,72 @@ public void exception(Throwable throwable) {
         StackTraceElement[] stackTrace = StackTraceUtils.startsWith(throwable.getStackTrace(), element -> element.toString().contains("org.junit"));
 
         if (throwable instanceof Failure) {
+            Failure failure = (Failure) throwable;
 
-        }
+            error("");
+            error("&b- - ~ ~< Failure >~ ~ - -&r");
+            error("");
+            error("&1" + failure.getMessage());
+            error("");
 
-        error("");
-        error("&b- - ~ ~< Exception >~ ~ - -&r");
-        error("");
-        error("Given:");
-        error("    Message:&1 " + throwable.getMessage());
-        error("    In:&1 " + stackTrace[0].toString());
-        error("    By:&1 " + throwable.getClass());
-        error("");
-        error("Stacktrace:");
+            failure.getNote().peek(note -> {
+                error("Note:");
+                error("  &1" + note);
+                error("");
+            });
+
+            IndicatedSource indicatedSource = failure.getIndicatedSource();
+            Location location = indicatedSource.getIndicated().getLocation();
+
+            String source = getCurrentLine(indicatedSource.getSource(), indicatedSource.getIndicated()).toString();
+            String element = getCurrentLine(indicatedSource.getIndicated(), indicatedSource.getIndicated()).toString();
+
+            int elementIndex = source.indexOf(element);
+            int endIndex = elementIndex + element.length();
 
-        for (StackTraceElement element : stackTrace) {
-            error("    at " + element.toString());
+            String content = elementIndex < 0 ? source : source.substring(0, elementIndex)
+                    + Colored.on(source.substring(elementIndex, endIndex)).effect(Effect.RED)
+                    + source.substring(endIndex);
+
+
+            error("Source:");
+            error("  " + content);
+            error("  " + StringUtils.buildSpace(source.indexOf(element)) + Colored.on("^").effect(Effect.BOLD));
+            error("Location:");
+            error("  Panda: &b" + location.getSource().getId() + "&r at line &1" + location.getDisplayLine() + "&r:&1" + location.getIndex());
+            error("");
+            error("Stacktrace:");
+
+            for (int index = 0; index < 2 && index < stackTrace.length; index++) {
+                StackTraceElement stackTraceElement = stackTrace[index];
+                error("  at " + stackTraceElement.toString());
+            }
+        }
+        else {
+            error("");
+            error("&b- - ~ ~< Exception >~ ~ - -&r");
+            error("");
+            error("Given:");
+            error("  Message:&1 " + throwable.getMessage());
+            error("  In:&1 " + stackTrace[0].toString());
+            error("  By:&1 " + throwable.getClass());
+            error("");
+            error("Stacktrace:");
+
+            for (StackTraceElement stackTraceElement : stackTrace) {
+                error("  at " + stackTraceElement);
+            }
         }
 
         error("");
         error("Environment:");
+        error("  Panda: " + PandaFrameworkConstants.VERSION);
+        error("  Java: " + System.getProperty("java.version") + " (" + System.getProperty("os.name") + ")");
         error("");
     }
 
+    private Snippet getCurrentLine(Snippetable source, Snippetable indicated) {
+        return source.toSnippet().getLine(indicated.toSnippet().getFirst().getLocation().getLine());
+    }
+
 }

panda-framework/src/main/java/org/panda_lang/language/interpreter/logging/SystemLogger.java

@@ -106,7 +106,11 @@ public ExpressionTransaction parse(Context context, Streamable streamable, Expre
         // if something went wrong
         if (worker.hasError()) {
             transaction.rollback();
-            throw new PandaParserFailure(expressionContext, worker.getError().getErrorSource(), worker.getError().getErrorMessage());
+            throw new PandaParserFailure(
+                    expressionContext, worker.getError().getErrorSource(),
+                    worker.getError().getErrorMessage(),
+                    "マルセルへの注意 \uD83E\uDD20"
+            );
         }
 
         // if context does not contain any results

panda-framework/src/main/java/org/panda_lang/language/interpreter/parser/expression/PandaExpressionParser.java

@@ -70,7 +70,7 @@ public boolean isMutable() {
     @Override
     public String toString() {
         return ContentJoiner.on(" ")
-                .join(tokens, representation -> representation.getToken().toString())
+                .join(tokens, Object::toString)
                 .toString();
     }
 

panda-framework/src/main/java/org/panda_lang/language/interpreter/token/MutableTokenInfo.java

@@ -65,7 +65,7 @@ public int hashCode() {
 
     @Override
     public String toString() {
-        return token.getValue();
+        return token.toString();
     }
 
     public static TokenInfo of(TokenType type, String value) {

panda-framework/src/main/java/org/panda_lang/language/interpreter/token/PandaSnippet.java

@@ -276,8 +276,17 @@ default Snippet getLine(int line) {
 
         for (TokenInfo tokenInfo : getTokensRepresentations()) {
             if (tokenInfo.getType() == TokenTypes.SECTION) {
-                selected.addAll(tokenInfo.toToken(Section.class).getContent().getLine(line).getTokensRepresentations());
-                continue;
+                Snippet content = tokenInfo.toToken(Section.class).getContent();
+                Snippet selectedContent = content.getLine(line);
+
+                if (!selectedContent.isEmpty()) {
+                    if (!content.equals(selectedContent)) {
+                        return selectedContent;
+                    }
+
+                    selected.add(tokenInfo);
+                    continue;
+                }
             }
 
             if (tokenInfo.getLocation().getLine() < line) {

panda-framework/src/main/java/org/panda_lang/language/interpreter/token/PandaTokenInfo.java

@@ -37,7 +37,7 @@ public Section(TokenInfo openingSeparator, Snippet content, TokenInfo closingSep
 
     @Override
     public String getValue() {
-        return content.toString();
+        return getOpeningSeparator().toString() + getClosingSeparator().toString();
     }
 
     @Override
@@ -63,7 +63,7 @@ public Separator getSeparator() {
 
     @Override
     public String toString() {
-        return getSeparator().toString() + " " + super.toString() + " " + getSeparator().getOpposite().toString();
+        return getOpeningSeparator().toString() + " " + getContent() + " " + getClosingSeparator().toString();
     }
 
 }