Remove frog from the repository.

frog/evaluator.dart

-// 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.
-
-
-#import('file_system.dart');
-#import('lang.dart');
-
-interface JsEvaluator {
-  var eval(String source);
-}
-
-class Evaluator {
-  JsEvaluator _jsEvaluator;
-  static String _prelude;
-  Library _lib;
-
-  static void initWorld(String homedir, List<String> args, FileSystem files) {
-    parseOptions(homedir, args, files);
-    options.forceDynamic = true;
-    options.compileAll = true;
-
-    initializeWorld(files);
-    world.process();
-    world.resolveAll();
-
-    world.gen = new WorldGenerator(null, new CodeWriter());
-    world.gen.markLibrariesUsed([world.coreimpl, world.corelib]);
-
-    world.gen.writeTypes(world.coreimpl);
-    world.gen.writeTypes(world.corelib);
-    world.gen.writeGlobals();
-    _prelude = world.gen.writer.text;
-
-    // Set these here so that we can compile the corelib without its errors
-    // killing us
-    options.throwOnErrors = true;
-    options.throwOnFatal = true;
-  }
-
-  _removeMember(String name) {
-    _lib.topType._resolvedMembers.remove(name);
-    _lib.topType.members.remove(name);
-    // Don't rely on the existing member's jsname, because the existing member
-    // may be null but the jsname may still be defined. This can happen if
-    // multiple Evaluators are instantiated against the same world.
-    var jsname = '${_lib.jsname}_$name';
-    world._topNames.remove(name);
-    world._topNames.remove(jsname);
-  }
-
-  Evaluator(JsEvaluator this._jsEvaluator) {
-    if (_prelude == null) {
-      throw new UnsupportedOperationException(
-          "Must call Evaluator.initWorld before creating a Evaluator.");
-    }
-    this._jsEvaluator.eval(_prelude);
-    _lib = new Library(new SourceFile("_ifrog_", ""));
-    _lib.imports.add(new LibraryImport(world.corelib));
-    _lib.resolve();
-  }
-
-  void _ensureVariableDefined(Identifier name,
-      [List<Token> modifiers = const [], TypeReference type = null]) {
-    var member = _lib.topType.getMember(name.name);
-    if (member is FieldMember || member is PropertyMember) return;
-    _removeMember(name.name);
-    _lib.topType.addField(
-        new VariableDefinition(modifiers, type, [name], [null], name.span));
-    _lib.topType.getMember(name.name).resolve();
-  }
-
-  var eval(String dart) {
-    var source = new SourceFile("_ifrog_", dart);
-    world.gen.writer = new CodeWriter();
-
-    var code;
-    var parsed = new Parser(source, throwOnIncomplete: true,
-        optionalSemicolons: true).evalUnit();
-    var method = new MethodMember("_ifrog_dummy", _lib.topType, null);
-    var methGen = new MethodGenerator(method, null);
-
-    if (parsed is ExpressionStatement) {
-      var body = parsed.body;
-      // Auto-declare variables that haven't been declared yet, so users can
-      // write "a = 1" rather than "var a = 1"
-      if (body is BinaryExpression && body.op.kind == TokenKind.ASSIGN &&
-          body.x is VarExpression) {
-        _ensureVariableDefined(body.x.dynamic.name);
-      }
-      code = body.visit(methGen).code;
-
-    } else if (parsed is VariableDefinition) {
-      var assignments = <Statement>[];
-      zip(parsed.names, parsed.values, (name, value) {
-        _ensureVariableDefined(name, parsed.modifiers, parsed.type);
-        var expr = new BinaryExpression(
-            new Token.fake(TokenKind.ASSIGN, parsed.span),
-            new VarExpression(name, name.span), value, parsed.span);
-        new ExpressionStatement(expr, parsed.span).visit(methGen);
-      });
-      code = methGen.writer.text;
-
-    } else if (parsed is FunctionDefinition) {
-      var methodName = parsed.name.name;
-      _removeMember(methodName);
-      _lib.topType.addMethod(methodName, parsed);
-      MethodMember definedMethod = _lib.topType.getMember(methodName);
-      definedMethod.resolve();
-      var definedMethGen = new MethodGenerator(definedMethod, null);
-      definedMethGen.run();
-      definedMethGen.writeDefinition(world.gen.writer, null);
-      code = world.gen.writer.text;
-    } else if (parsed is TypeDefinition) {
-      _removeMember(parsed.name.name);
-      parsed.visit(new _LibraryVisitor(_lib));
-      var type = _lib.findTypeByName(parsed.name.name);
-      type.resolve();
-      world.gen.markTypeUsed(type);
-      world.gen.writeType(type);
-      code = '${world.gen.writer.text}; undefined';
-    } else {
-      parsed.visit(methGen);
-      code = methGen.writer.text;
-    }
-
-    world.gen.writer = new CodeWriter();
-    world.gen.writeAllDynamicStubs([world.coreimpl, world.corelib, _lib]);
-
-    return this._jsEvaluator.eval('${world.gen.writer.text}; $code');
-  }
-}