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com.google.gwt.dev.js.ast.JsVisitor Maven / Gradle / Ivy
/*
* 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 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 void acceptList(List collection) {
doAcceptList(collection);
}
public JsExpression acceptLvalue(JsExpression expr) {
return doAcceptLvalue(expr);
}
public final void acceptWithInsertRemove(List 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 doAccept(T node) {
doTraverse(node, UNMODIFIABLE_CONTEXT);
return node;
}
protected void doAcceptList(List collection) {
for (T node : collection) {
doTraverse(node, UNMODIFIABLE_CONTEXT);
}
}
protected JsExpression doAcceptLvalue(JsExpression expr) {
doTraverse(expr, LVALUE_CONTEXT);
return expr;
}
protected void doAcceptWithInsertRemove(List collection) {
for (Iterator it = collection.iterator(); it.hasNext();) {
doTraverse(it.next(), UNMODIFIABLE_CONTEXT);
}
}
protected final 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;
}
}
