Adding Angular and dependent packages for testing

third_party/pkg/angular/lib/tools/parser_generator/generator.dart

+library generator;
+
+import 'dart_code_gen.dart';
+import '../../core/parser/parser_library.dart';
+import 'source.dart';
+
+class SourcePrinter {
+  printSrc(src) {
+    print(src);
+  }
+}
+
+class ParserGenerator {
+  DynamicParser _parser;
+  Map<String, bool> _printedFunctions = {};
+  GetterSetterGenerator _getters;
+  SourceBuilder _ = new SourceBuilder();
+  SourcePrinter _prt;
+
+  ParserGenerator(this._parser, this._getters, this._prt);
+
+  generateParser(Iterable<String> expressions) {
+    _prt..printSrc("genEvalError(msg) { throw msg; }")
+      ..printSrc("functions(FilterLookup filters) => "
+                 "new StaticParserFunctions(buildExpressions(filters));")
+      ..printSrc('var evalError = (text, [s]) => text;')
+      ..printSrc("");
+    BodySource body = new BodySource();
+    MapSource map = new MapSource();
+
+    // deterimine the order.
+    expressions.forEach((exp) {
+      var code = safeCode(exp);
+      map('${_.str(exp)}: ${_.ref(code)}');
+    });
+    // now do it in actual order
+    _.codeRefs.forEach((code) {
+      body(_.stmt('Expression ${_.ref(code)} = ', code.toSource(_)));
+    });
+    body(_.stmt('return ', map));
+    _prt..printSrc("Map<String, Expression> buildExpressions(FilterLookup filters) ${body}")
+      ..printSrc("\n")
+      ..printSrc(_getters.functions);
+  }
+
+  Code safeCode(String exp) {
+    try {
+      return _parser(exp);
+    } catch (e) {
+      if ("$e".contains('Parser Error') ||
+      "$e".contains('Lexer Error') ||
+      "$e".contains('Unexpected end of expression')) {
+        return  new ThrowCode("'${escape(e.toString())}';");
+      } else {
+        rethrow;
+      }
+    }
+  }
+
+}