Correctly match and print strings with escaped values

lib/src/escape.dart

Index: lib/src/escape.dart
diff --git a/lib/src/escape.dart b/lib/src/escape.dart
new file mode 100644
index 0000000000000000000000000000000000000000..eda1047d767c7f1ddd0de4cc776f6358f774e4dc
--- /dev/null
+++ b/lib/src/escape.dart
@@ -0,0 +1,30 @@
+// Copyright (c) 2015, 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.
+
+library matcher.escape;
+
+const _escapMap = const {

[nweiz, 2015/02/04 01:34:45]

"escapMap" -> "escapeMap"

[kevmoo, 2015/02/04 05:28:21]

Done.

+  '\n': r'\n',
+  '\r': r'\r',
+  '\f': r'\f',
+  '\b': r'\b',
+  '\t': r'\t',
+  '\v': r'\v',
+};
+
+final _escapeStr = "[" + _escapMap.keys.map(_getHexLiteral).join() + "]";

[nweiz, 2015/02/04 01:34:45]

Just inline this in the regexp definition.

[kevmoo, 2015/02/04 05:28:21]

Done.

+
+final _escapeRegExp = new RegExp(_escapeStr);
+
+String escape(String s) {

[nweiz, 2015/02/04 01:34:45]

Put this in utils. Also, document everything in here.

[kevmoo, 2015/02/04 05:28:21]

Done.

[kevmoo, 2015/02/04 05:28:21]

Done.

+  s = s.replaceAll('\\', r'\\');
+  return s.replaceAllMapped(_escapeRegExp, (m) {
+    return _escapMap[m.input];
+  });
+}
+
+String _getHexLiteral(String input) {
+  int rune = input.runes.single;
+  return r'\x' + rune.toRadixString(16).padLeft(2, '0');
+}