| /* |
| * Copyright 2011 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.cfg.ConfigurationProperties; |
| import com.google.gwt.dev.js.ast.JsContext; |
| import com.google.gwt.dev.js.ast.JsForIn; |
| import com.google.gwt.dev.js.ast.JsFunction; |
| import com.google.gwt.dev.js.ast.JsLabel; |
| import com.google.gwt.dev.js.ast.JsName; |
| import com.google.gwt.dev.js.ast.JsNameOf; |
| import com.google.gwt.dev.js.ast.JsNameRef; |
| import com.google.gwt.dev.js.ast.JsParameter; |
| import com.google.gwt.dev.js.ast.JsProgram; |
| import com.google.gwt.dev.js.ast.JsScope; |
| import com.google.gwt.dev.js.ast.JsVars; |
| import com.google.gwt.dev.js.ast.JsVisitor; |
| |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| /** |
| * A class that allocates unique identifiers for JsNames. |
| */ |
| public abstract class JsNamer { |
| |
| /** |
| * Indicates the presence of a naming problem that prevents further compilation. |
| */ |
| public static class IllegalNameException extends Exception { |
| |
| public IllegalNameException(String message) { |
| super(message); |
| } |
| } |
| |
| private static Set<JsName> collectReferencedNames(JsProgram program) { |
| final Set<JsName> referenced = new HashSet<JsName>(); |
| new JsVisitor() { |
| @Override |
| public void endVisit(JsForIn x, JsContext ctx) { |
| reference(x.getIterVarName()); |
| } |
| |
| @Override |
| public void endVisit(JsFunction x, JsContext ctx) { |
| reference(x.getName()); |
| } |
| |
| @Override |
| public void endVisit(JsLabel x, JsContext ctx) { |
| reference(x.getName()); |
| } |
| |
| @Override |
| public void endVisit(JsNameOf x, JsContext ctx) { |
| reference(x.getName()); |
| } |
| |
| @Override |
| public void endVisit(JsNameRef x, JsContext ctx) { |
| reference(x.getName()); |
| } |
| |
| @Override |
| public void endVisit(JsParameter x, JsContext ctx) { |
| reference(x.getName()); |
| } |
| |
| @Override |
| public void endVisit(JsVars.JsVar x, JsContext ctx) { |
| reference(x.getName()); |
| } |
| |
| private void reference(JsName name) { |
| if (name != null) { |
| referenced.add(name); |
| } |
| } |
| }.accept(program); |
| return referenced; |
| } |
| |
| protected final JsProgram program; |
| |
| protected final Set<JsName> referenced; |
| |
| protected final ReservedNames reserved; |
| |
| public JsNamer(JsProgram program, ConfigurationProperties config) { |
| this.program = program; |
| referenced = collectReferencedNames(program); |
| reserved = new ReservedNames(config); |
| } |
| |
| protected final void execImpl() throws IllegalNameException { |
| reset(); |
| visit(program.getScope()); |
| reset(); |
| visit(program.getObjectScope()); |
| } |
| |
| protected abstract void reset(); |
| |
| protected abstract void visit(JsScope scope) throws IllegalNameException; |
| } |