| /* |
| * Copyright 2008 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.ast; |
| |
| import com.google.gwt.dev.jjs.HasSourceInfo; |
| import com.google.gwt.dev.jjs.InternalCompilerException; |
| import com.google.gwt.dev.js.ast.JsVars.JsVar; |
| |
| import java.util.Iterator; |
| import java.util.List; |
| |
| /** |
| * Implemented by nodes that will visit child nodes. |
| */ |
| @SuppressWarnings("unused") |
| public class JsVisitor { |
| |
| protected static final JsContext LVALUE_CONTEXT = new JsContext() { |
| |
| @Override |
| public boolean canInsert() { |
| return false; |
| } |
| |
| @Override |
| public boolean canRemove() { |
| return false; |
| } |
| |
| @Override |
| public void insertAfter(JsVisitable node) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public void insertBefore(JsVisitable node) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public boolean isLvalue() { |
| return true; |
| } |
| |
| @Override |
| public void removeMe() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public void replaceMe(JsVisitable node) { |
| throw new UnsupportedOperationException(); |
| } |
| }; |
| |
| protected static final JsContext UNMODIFIABLE_CONTEXT = new JsContext() { |
| |
| @Override |
| public boolean canInsert() { |
| return false; |
| } |
| |
| @Override |
| public boolean canRemove() { |
| return false; |
| } |
| |
| @Override |
| public void insertAfter(JsVisitable node) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public void insertBefore(JsVisitable node) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public boolean isLvalue() { |
| return false; |
| } |
| |
| @Override |
| public void removeMe() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public void replaceMe(JsVisitable node) { |
| throw new UnsupportedOperationException(); |
| } |
| }; |
| |
| @SuppressWarnings("cast") |
| public final <T extends JsVisitable> T accept(T node) { |
| // The following cast to T is needed for javac 1.5.0_13 |
| // as shipped on OS X |
| return (T) doAccept(node); |
| } |
| |
| public final <T extends JsVisitable> void acceptList(List<T> collection) { |
| doAcceptList(collection); |
| } |
| |
| public JsExpression acceptLvalue(JsExpression expr) { |
| return doAcceptLvalue(expr); |
| } |
| |
| public final <T extends JsVisitable> void acceptWithInsertRemove(List<T> collection) { |
| doAcceptWithInsertRemove(collection); |
| } |
| |
| public boolean didChange() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public void endVisit(JsArrayAccess x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsArrayLiteral x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsBinaryOperation x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsBlock x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsBooleanLiteral x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsBreak x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsCase x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsCatch x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsConditional x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsContinue x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsDebugger x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsDefault x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsDoWhile x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsEmpty x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsExprStmt x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsFor x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsForIn x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsFunction x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsIf x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsInvocation x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsLabel x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsNameOf x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsNameRef x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsNew x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsNullLiteral x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsNumberLiteral x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsNumericEntry x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsObjectLiteral x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsParameter x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsPositionMarker x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsPostfixOperation x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsPrefixOperation x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsProgram x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsProgramFragment x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsPropertyInitializer x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsRegExp x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsReturn x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsStringLiteral x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsSwitch x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsThisRef x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsThrow x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsTry x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsVar x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsVars x, JsContext ctx) { |
| } |
| |
| public void endVisit(JsWhile x, JsContext ctx) { |
| } |
| |
| public boolean visit(JsArrayAccess x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsArrayLiteral x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsBinaryOperation x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsBlock x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsBooleanLiteral x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsBreak x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsCase x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsCatch x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsConditional x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsContinue x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsDebugger x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsDefault x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsDoWhile x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsEmpty x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsExprStmt x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsFor x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsForIn x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsFunction x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsIf x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsInvocation x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsLabel x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsNameOf x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsNameRef x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsNew x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsNullLiteral x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsNumberLiteral x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsNumericEntry x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsObjectLiteral x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsParameter x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsPositionMarker x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsPostfixOperation x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsPrefixOperation x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsProgram x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsProgramFragment x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsPropertyInitializer x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsRegExp x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsReturn x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsStringLiteral x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsSwitch x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsThisRef x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsThrow x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsTry x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsVar x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsVars x, JsContext ctx) { |
| return true; |
| } |
| |
| public boolean visit(JsWhile x, JsContext ctx) { |
| return true; |
| } |
| |
| protected <T extends JsVisitable> T doAccept(T node) { |
| doTraverse(node, UNMODIFIABLE_CONTEXT); |
| return node; |
| } |
| |
| protected <T extends JsVisitable> void doAcceptList(List<T> collection) { |
| for (T node : collection) { |
| doTraverse(node, UNMODIFIABLE_CONTEXT); |
| } |
| } |
| |
| protected JsExpression doAcceptLvalue(JsExpression expr) { |
| doTraverse(expr, LVALUE_CONTEXT); |
| return expr; |
| } |
| |
| protected <T extends JsVisitable> void doAcceptWithInsertRemove(List<T> collection) { |
| for (Iterator<T> it = collection.iterator(); it.hasNext();) { |
| doTraverse(it.next(), UNMODIFIABLE_CONTEXT); |
| } |
| } |
| |
| protected final <T extends JsVisitable> void doTraverse(T node, JsContext ctx) { |
| try { |
| node.traverse(this, ctx); |
| } catch (Throwable e) { |
| throw translateException(node, e); |
| } |
| } |
| |
| private InternalCompilerException translateException(JsVisitable node, Throwable e) { |
| if (e instanceof VirtualMachineError) { |
| // Always rethrow VM errors (an attempt to wrap may fail). |
| throw (VirtualMachineError) e; |
| } |
| InternalCompilerException ice; |
| if (e instanceof InternalCompilerException) { |
| ice = (InternalCompilerException) e; |
| } else { |
| ice = new InternalCompilerException("Unexpected error during visit.", e); |
| } |
| ice.addNode((HasSourceInfo) node); |
| return ice; |
| } |
| } |