| /* |
| * Copyright 2007 Google Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| * use this file except in compliance with the License. You may obtain a copy of |
| * the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| * License for the specific language governing permissions and limitations under |
| * the License. |
| */ |
| package com.google.gwt.dev.js; |
| |
| import com.google.gwt.dev.js.ast.JsCatch; |
| import com.google.gwt.dev.js.ast.JsContext; |
| import com.google.gwt.dev.js.ast.JsFunction; |
| import com.google.gwt.dev.js.ast.JsNameRef; |
| import com.google.gwt.dev.js.ast.JsProgram; |
| import com.google.gwt.dev.js.ast.JsScope; |
| import com.google.gwt.dev.js.ast.JsVisitor; |
| |
| import java.util.Stack; |
| |
| /** |
| * Base class for any recursive resolver classes. |
| */ |
| public abstract class JsAbstractSymbolResolver extends JsVisitor { |
| |
| private final Stack<JsScope> scopeStack = new Stack<JsScope>(); |
| |
| @Override |
| public void endVisit(JsCatch x, JsContext ctx) { |
| popScope(); |
| } |
| |
| @Override |
| public void endVisit(JsFunction x, JsContext ctx) { |
| popScope(); |
| } |
| |
| @Override |
| public void endVisit(JsNameRef x, JsContext ctx) { |
| if (x.isResolved()) { |
| return; |
| } |
| |
| resolve(x); |
| } |
| |
| @Override |
| public void endVisit(JsProgram x, JsContext ctx) { |
| popScope(); |
| } |
| |
| @Override |
| public boolean visit(JsCatch x, JsContext ctx) { |
| pushScope(x.getScope()); |
| return true; |
| } |
| |
| @Override |
| public boolean visit(JsFunction x, JsContext ctx) { |
| pushScope(x.getScope()); |
| return true; |
| } |
| |
| @Override |
| public boolean visit(JsProgram x, JsContext ctx) { |
| pushScope(x.getScope()); |
| return true; |
| } |
| |
| protected JsScope getScope() { |
| return scopeStack.peek(); |
| } |
| |
| protected abstract void resolve(JsNameRef x); |
| |
| private void popScope() { |
| scopeStack.pop(); |
| } |
| |
| private void pushScope(JsScope scope) { |
| scopeStack.push(scope); |
| } |
| } |