Add stack trace in engines based on V8. Fixes #331

lib/compiler/passes/generate-javascript.js

@@ -778,8 +778,11 @@ function generateJavascript(ast, options) {
     '    this.expected = expected;',
     '    this.found    = found;',
     '    this.location = location;',
-    '',
     '    this.name     = "SyntaxError";',
+    '',
+    '    if (typeof Error.captureStackTrace === "function") {',
+    '      Error.captureStackTrace(this, peg$SyntaxError);',
+    '    }',
     '  }',
     '',
     '  peg$subclass(peg$SyntaxError, Error);',

lib/grammar-error.js

@@ -5,6 +5,10 @@ function GrammarError(message, location) {
   this.name = "GrammarError";
   this.message = message;
   this.location = location;
+
+  if (typeof Error.captureStackTrace === "function") {
+    Error.captureStackTrace(this, GrammarError);
+  }
 }
 
 classes.subclass(GrammarError, Error);

lib/parser.js

@@ -16,8 +16,11 @@ module.exports = (function() {
     this.expected = expected;
     this.found    = found;
     this.location = location;
-
     this.name     = "SyntaxError";
+
+    if (typeof Error.captureStackTrace === "function") {
+      Error.captureStackTrace(this, peg$SyntaxError);
+    }
   }
 
   peg$subclass(peg$SyntaxError, Error);