Adding Angular and dependent packages for testing

third_party/pkg/angular/lib/core/parser/backend.dart

+part of angular.core.parser;
+
+typedef dynamic LocalsWrapper(dynamic context, dynamic locals);
+
+class BoundExpression {
+  var _context;
+  LocalsWrapper _localsWrapper;
+  Expression expression;
+
+  BoundExpression(this._context, this.expression, this._localsWrapper);
+  _localContext(locals) {
+    if (locals != null) {
+      if (_localsWrapper == null) {
+          throw new StateError("Locals $locals provided, but no LocalsWrapper strategy.");
+      }
+      return _localsWrapper(_context, locals);
+    }
+    return _context;
+  }
+
+  call([locals]) => expression.eval(_localContext(locals));
+  assign(value, [locals]) => expression.assign(_localContext(locals), value);
+}
+
+class Expression implements ParserAST {
+  final ParsedGetter eval;
+  final ParsedSetter assign;
+
+  String exp;
+  List parts;
+
+  // Expressions that represent field accesses have a couple of
+  // extra fields. We use that to generate an optimized closure
+  // for calling fields of objects without having to load the
+  // field separately.
+  Expression fieldHolder;
+  String fieldName;
+  bool get isFieldAccess => fieldHolder != null;
+
+  Expression(ParsedGetter this.eval, [ParsedSetter this.assign]);
+
+  bind(context, [localsWrapper]) => new BoundExpression(context, this, localsWrapper);
+
+  get assignable => assign != null;
+}
+
+@NgInjectableService()
+class GetterSetter {
+  static stripTrailingNulls(List l) {
+    while (l.length > 0 && l.last == null) {
+      l.removeLast();
+    }
+    return l;
+  }
+
+  static  _computeUseInstanceMembers() {
+    try {
+      reflect(Object).type.instanceMembers;
+      return true;
+    } catch (e) {
+      return false;
+    }
+  }
+
+   final bool _useInstanceMembers = _computeUseInstanceMembers();
+
+  _containsKey(InstanceMirror instanceMirror, Symbol symbol) {
+    dynamic type = (instanceMirror.type as dynamic);
+    var members = _useInstanceMembers ? type.instanceMembers : type.members;
+    return members.containsKey(symbol);
+  }
+
+  _maybeInvoke(instanceMirror, symbol) {
+    if (_containsKey(instanceMirror, symbol)) {
+      MethodMirror methodMirror = instanceMirror.type.members[symbol];
+      return relaxFnArgs(([a0, a1, a2, a3, a4, a5]) {
+        var args = stripTrailingNulls([a0, a1, a2, a3, a4, a5]);
+        return instanceMirror.invoke(symbol, args).reflectee;
+      });
+    }
+    return null;
+  }
+
+  Map<String, Function> _getter_cache = {};
+
+  Function getter(String key) {
+    var value = _getter_cache[key];
+    if (value != null) return value;
+    return _getter_cache[key] = _getter(key);
+  }
+
+  Function _getter(String key) {
+    var symbol = new Symbol(key);
+    Map<ClassMirror, Function> fieldCache = {};
+    return (o) {
+      InstanceMirror instanceMirror = reflect(o);
+      ClassMirror classMirror = instanceMirror.type;
+      Function fn = fieldCache[classMirror];
+      if (fn == null) {
+        try {
+          return (fieldCache[classMirror] = (instanceMirror) => instanceMirror.getField(symbol).reflectee)(instanceMirror);
+        } on NoSuchMethodError catch (e) {
+          var value = (fieldCache[classMirror] = (instanceMirror) => _maybeInvoke(instanceMirror, symbol))(instanceMirror);
+          if (value == null) { rethrow; }
+          return value;
+        } on UnsupportedError catch (e) {
+          var value = (fieldCache[classMirror] = (instanceMirror) => _maybeInvoke(instanceMirror, symbol))(instanceMirror);
+          if (value == null) { rethrow; }
+          return value;
+        }
+      } else {
+        return fn(instanceMirror);
+      }
+    };
+  }
+
+  Function setter(String key) {
+    var symbol = new Symbol(key);
+    return (o, v) {
+      reflect(o).setField(symbol, v);
+      return v;
+    };
+  }
+}
+
+var undefined_ = const Symbol("UNDEFINED");
+
+@NgInjectableService()
+class ParserBackend {
+  GetterSetter _getterSetter;
+  FilterMap _filters;
+
+  ParserBackend(GetterSetter this._getterSetter, FilterMap this._filters);
+
+  static Expression ZERO = new Expression((_, [_x]) => 0);
+
+  getter(String path) {
+    List<String> keys = path.split('.');
+    List<Function> getters = keys.map(_getterSetter.getter).toList();
+
+    if (getters.isEmpty) {
+      return (self) => self;
+    } else {
+      return (dynamic self) {
+        if (self == null) {
+          return null;
+        }
+
+        // Cache for local closure access
+        List<String> _keys = keys;
+        List<Function> _getters = getters;
+        var _gettersLength = _getters.length;
+
+        num i = 0;
+        for (; i < _gettersLength; i++) {
+          if (self is Map) {
+            self = self[_keys[i]];
+          } else {
+            self = _getters[i](self);
+          }
+          if (self == null) {
+            return null;
+          }
+        }
+        return self;
+      };
+    }
+  }
+
+  setter(String path) {
+    List<String> keys = path.split('.');
+    List<Function> getters = keys.map(_getterSetter.getter).toList();
+    List<Function> setters = keys.map(_getterSetter.setter).toList();
+    return (dynamic self, dynamic value) {
+      num i = 0;
+      List<String> _keys = keys;
+      List<Function> _getters = getters;
+      List<Function> _setters = setters;
+      var setterLengthMinusOne = _keys.length - 1;
+
+      dynamic selfNext;
+      for (; i < setterLengthMinusOne; i++) {
+        if (self is Map) {
+          selfNext = self[_keys[i]];
+        } else {
+          selfNext = _getters[i](self);
+        }
+
+        if (selfNext == null) {
+          selfNext = {};
+          if (self is Map) {
+            self[_keys[i]] = selfNext;
+          } else {
+            _setters[i](self, selfNext);
+          }
+        }
+        self = selfNext;
+      }
+      if (self is Map) {
+        self[_keys[setterLengthMinusOne]] = value;
+      } else {
+        _setters[i](self, value);
+      }
+      return value;
+    };
+  }
+
+  List evalList(List<Expression> list, self) {
+    int length = list.length;
+    List result = new List(length);
+    for (int i = 0; i < length; i++) {
+      result[i] = list[i].eval(self);
+    }
+    return result;
+  }
+
+  _op(opKey) => OPERATORS[opKey];
+
+  Expression ternaryFn(Expression cond, Expression _true, Expression _false) =>
+      new Expression((self) => _op('?')(
+          self, cond, _true, _false));
+
+  Expression binaryFn(Expression left, String op, Expression right) =>
+      new Expression((self) => _op(op)(self, left, right));
+
+  Expression unaryFn(String op, Expression right) =>
+      new Expression((self) => _op(op)(self, right, null));
+
+  Expression assignment(Expression left, Expression right, evalError) =>
+      new Expression((self) {
+        try {
+          return left.assign(self, right.eval(self));
+        } catch (e, s) {
+          throw evalError('Caught $e', s);
+        }
+      });
+
+  Expression multipleStatements(statements) =>
+      new Expression((self) {
+        var value;
+        for ( var i = 0; i < statements.length; i++) {
+          var statement = statements[i];
+          if (statement != null)
+            value = statement.eval(self);
+        }
+        return value;
+      });
+
+  Expression functionCall(fn, fnName, argsFn, evalError) {
+    if (fn.isFieldAccess) {
+      Symbol key = new Symbol(fn.fieldName);
+      return new Expression((self) {
+        List args = evalList(argsFn, self);
+        var holder = fn.fieldHolder.eval(self);
+        InstanceMirror instanceMirror = reflect(holder);
+        return instanceMirror.invoke(key, args).reflectee;
+      });
+    } else {
+      return new Expression((self) {
+        List args = evalList(argsFn, self);
+        var userFn = safeFunctionCall(fn.eval(self), fnName, evalError);
+        return relaxFnApply(userFn, args);
+      });
+    }
+  }
+
+  Expression arrayDeclaration(elementFns) =>
+      new Expression((self){
+        var array = [];
+        for ( var i = 0; i < elementFns.length; i++) {
+          array.add(elementFns[i].eval(self));
+        }
+        return array;
+      });
+
+  Expression objectIndex(obj, indexFn, evalError) =>
+      new Expression((self) {
+        var i = indexFn.eval(self);
+        var o = obj.eval(self),
+        v, p;
+
+        v = objectIndexGetField(o, i, evalError);
+
+        return v;
+      }, (self, value) =>
+          objectIndexSetField(obj.eval(self),
+              indexFn.eval(self), value, evalError)
+      );
+
+  Expression fieldAccess(object, field) {
+    var setterFn = setter(field);
+    var getterFn = getter(field);
+    return new Expression(
+        (self) => getterFn(object.eval(self)),
+        (self, value) => setterFn(object.eval(self), value))
+            ..fieldHolder = object
+            ..fieldName = field;
+  }
+
+  Expression object(keyValues) =>
+      new Expression((self){
+        var object = {};
+        for ( var i = 0; i < keyValues.length; i++) {
+          var keyValue = keyValues[i];
+          var value = keyValue["value"].eval(self);
+          object[keyValue["key"]] = value;
+        }
+        return object;
+      });
+
+  Expression profiled(value, _perf, text) {
+    if (value is FilterExpression) return value;
+    var wrappedGetter = (s) =>
+    _perf.time('angular.parser.getter', () => value.eval(s), text);
+    var wrappedAssignFn = null;
+    if (value.assign != null) {
+      wrappedAssignFn = (s, v) =>
+      _perf.time('angular.parser.assign',
+          () => value.assign(s, v), text);
+    }
+    return new Expression(wrappedGetter, wrappedAssignFn);
+  }
+
+  Expression fromOperator(String op) =>
+      new Expression((s) => OPERATORS[op](s, null, null));
+
+  Expression getterSetter(key) =>
+      new Expression(getter(key), setter(key));
+
+  Expression value(v) =>
+      new Expression((self) => v);
+
+  zero() => ZERO;
+
+  Expression filter(String filterName,
+                         Expression leftHandSide,
+                         List<Expression> parameters,
+                         Function evalError) {
+    var filterFn = _filters(filterName);
+    return new FilterExpression(filterFn, leftHandSide, parameters);
+  }
+}
+
+class FilterExpression extends Expression {
+  final Function filterFn;
+  final Expression leftHandSide;
+  final List<Expression> parameters;
+
+  FilterExpression(Function this.filterFn,
+                   Expression this.leftHandSide,
+                   List<Expression> this.parameters): super(null);
+
+  get eval => _eval;
+
+  dynamic _eval(self) {
+    var args = [leftHandSide.eval(self)];
+    for ( var i = 0; i < parameters.length; i++) {
+      args.add(parameters[i].eval(self));
+    }
+    return Function.apply(filterFn, args);
+  }
+}