Add a basic YAML processor. Much of the language is still unimplemented.

tests/utils/src/test_utils.dart

Index: tests/utils/src/test_utils.dart
diff --git a/tests/utils/src/test_utils.dart b/tests/utils/src/test_utils.dart
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+++ b/tests/utils/src/test_utils.dart
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+// 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.
+
+#library('test_utils');
+
+/**
+ * Removes eight spaces of leading indentation from a multiline string.
+ *
+ * Note that this is very sensitive to how the literals are styled. They should
+ * be:
+ *     '''
+ *     Text starts on own line. Lines up with subsequent lines.
+ *     Lines are indented exactly 8 characters from the left margin.
+ *     Close is on the same line.'''
+ *
+ * This does nothing if text is only a single line.
+ */
+String cleanUpLiteral(String text) {
+  var lines = text.split('\n');
+  if (lines.length <= 1) return text;
+
+  for (var j = 0; j < lines.length; j++) {
+    if (lines[j].length > 8) {
+      lines[j] = lines[j].substring(8, lines[j].length);
+    } else {
+      lines[j] = '';
+    }
+  }
+
+  return Strings.join(lines, '\n');
+}
+
+/**
+ * Indents each line of [text] so that, when passed to [cleanUpLiteral], it will
+ * produce output identical to [text].
+ *
+ * This is useful for literals that need to include newlines but can't be
+ * conveniently represented as multi-line strings.
+ */
+String indentLiteral(String text) {
+  var lines = text.split('\n');
+  if (lines.length <= 1) return text;
+
+  for (var i = 0; i < lines.length; i++) {
+    lines[i] = "        ${lines[i]}";
+  }
+
+  return Strings.join(lines, "\n");
+}