Fixing string compile-time constant evaluation

frog/utils.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // Collection<T> supports most of the ES 5 Array methods, but it's missing
 // map and reduce.
 
 // TODO(jmesserly): we might want a version of this that return an iterable,
 // however JS, Python and Ruby versions are all eager.
 List map(Iterable source, mapper(source)) {
@@ skipping 52 matching lines @@
 
 /** True if this is a triple quoted Dart string literal. */
 bool isMultilineString(String text) {
   return text.startsWith('"""') || text.startsWith("'''");
 }
 
 bool isRawMultilineString(String text) {
   return text.startsWith('@"""') || text.startsWith("@'''");
 }
 
+/**
+ * Convert a single-quote string to be a double-quote string by replacing " with
+ * \" and \' with '.
+ */
+String toDoubleQuote(String s) {
+  return s.replaceAll('"', '\\"').replaceAll("\\'", "'");
+}
+
+
 // TODO(jmesserly): it'd be nice to deal with this in the tokenizer, rather than
 // taking another pass over the string.
 String parseStringLiteral(String lit) {
   if (lit.startsWith('@')) {
     if (isRawMultilineString(lit)) {
       return stripLeadingNewline(lit.substring(4, lit.length - 3));
     } else {
       return lit.substring(2, lit.length - 1);
     }
   } else if (isMultilineString(lit)) {
@@ skipping 43 matching lines @@
   final int length;
   int _index = 0;
   FixedIterator(this.value, this.length);
 
   bool hasNext() => _index < length;
   E next() {
     _index++;
     return value;
   }
 }