Adding Angular and dependent packages for testing

third_party/pkg/route_hierarchical/lib/url_template.dart

+library url_template;
+
+import 'url_matcher.dart';
+
+final _specialChars = new RegExp(r'[\\\(\)\$\^\.\+\[\]\{\}\|]');
+
+/**
+ * A reversible URL template class that can match/parse and reverse URL
+ * templates like: /foo/:bar/baz
+ */
+class UrlTemplate implements UrlMatcher {
+  List<String> _fields;
+  RegExp _pattern;
+  List _chunks;
+
+  String toString() {
+    return '$_pattern';
+  }
+
+  UrlTemplate(String template) {
+    _compileTemplate(template);
+  }
+
+  void _compileTemplate(String template) {
+    template = template.
+        replaceAllMapped(_specialChars, (m) => r'\' + m.group(0));
+    _fields = <String>[];
+    _chunks = [];
+    var exp = new RegExp(r':([\w0-9]+)');
+    StringBuffer sb = new StringBuffer('^');
+    int start = 0;
+    exp.allMatches(template).forEach((Match m) {
+      var paramName = m.group(1);
+      var txt = template.substring(start, m.start);
+      _fields.add(paramName);
+      _chunks.add(txt);
+      _chunks.add((Map params) => params != null ? params[paramName] : null);
+       sb.write(txt);
+      sb.write(r'([^/?]+)');
+      start = m.end;
+    });
+    if (start != template.length) {
+      var txt = template.substring(start, template.length);
+      sb.write(txt);
+      _chunks.add(txt);
+    }
+    _pattern = new RegExp(sb.toString());
+  }
+
+  UrlMatch match(String url) {
+    var matches = _pattern.allMatches(url);
+    if (matches.isEmpty) {
+      return null;
+    }
+    var parameters = new Map();
+    Match match = matches.first;
+    for (var i = 0; i < match.groupCount; i++) {
+      parameters[_fields[i]] = match.group(i + 1);
+    }
+    var tail = url.substring(match.group(0).length);
+    return new UrlMatch(match.group(0), tail, parameters);
+  }
+
+  String reverse({Map parameters, String tail: ''}) =>
+    _chunks.map((c) => c is Function ? c(parameters) : c).join() + tail;
+
+  List<String> urlParameterNames() {
+    return _fields;
+  }
+}