/*
* 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.jjs.impl;
import com.google.gwt.dev.jjs.InternalCompilerException;
import com.google.gwt.dev.jjs.ast.Context;
import com.google.gwt.dev.jjs.ast.JAbsentArrayDimension;
import com.google.gwt.dev.jjs.ast.JArrayLength;
import com.google.gwt.dev.jjs.ast.JArrayRef;
import com.google.gwt.dev.jjs.ast.JBinaryOperation;
import com.google.gwt.dev.jjs.ast.JBooleanLiteral;
import com.google.gwt.dev.jjs.ast.JCastOperation;
import com.google.gwt.dev.jjs.ast.JCharLiteral;
import com.google.gwt.dev.jjs.ast.JClassLiteral;
import com.google.gwt.dev.jjs.ast.JClassType;
import com.google.gwt.dev.jjs.ast.JConditional;
import com.google.gwt.dev.jjs.ast.JDoubleLiteral;
import com.google.gwt.dev.jjs.ast.JExpression;
import com.google.gwt.dev.jjs.ast.JFieldRef;
import com.google.gwt.dev.jjs.ast.JFloatLiteral;
import com.google.gwt.dev.jjs.ast.JGwtCreate;
import com.google.gwt.dev.jjs.ast.JInstanceOf;
import com.google.gwt.dev.jjs.ast.JIntLiteral;
import com.google.gwt.dev.jjs.ast.JLocalRef;
import com.google.gwt.dev.jjs.ast.JLongLiteral;
import com.google.gwt.dev.jjs.ast.JMethodCall;
import com.google.gwt.dev.jjs.ast.JNameOf;
import com.google.gwt.dev.jjs.ast.JNewArray;
import com.google.gwt.dev.jjs.ast.JNewInstance;
import com.google.gwt.dev.jjs.ast.JNullLiteral;
import com.google.gwt.dev.jjs.ast.JParameterRef;
import com.google.gwt.dev.jjs.ast.JPostfixOperation;
import com.google.gwt.dev.jjs.ast.JPrefixOperation;
import com.google.gwt.dev.jjs.ast.JRunAsync;
import com.google.gwt.dev.jjs.ast.JStringLiteral;
import com.google.gwt.dev.jjs.ast.JThisRef;
import com.google.gwt.dev.jjs.ast.JVisitor;
import com.google.gwt.dev.jjs.ast.js.JMultiExpression;
import com.google.gwt.dev.jjs.ast.js.JsniFieldRef;
import com.google.gwt.dev.jjs.ast.js.JsniMethodRef;
import java.util.ArrayList;
import java.util.List;
/**
* A general purpose expression cloner.
*/
public class CloneExpressionVisitor extends JVisitor {
private JExpression expression;
public CloneExpressionVisitor() {
}
@SuppressWarnings("unchecked")
public <T extends JExpression> T cloneExpression(T expr) {
if (expr == null) {
return null;
}
// double check that the expression is successfully cloned
expression = null;
this.accept(expr);
if (expression == null) {
throw new InternalCompilerException(expr, "Unable to clone expression", null);
}
Class<T> originalClass = (Class<T>) expr.getClass();
return originalClass.cast(expression);
}
public ArrayList<JExpression> cloneExpressions(List<JExpression> exprs) {
if (exprs == null) {
return null;
}
ArrayList<JExpression> result = new ArrayList<JExpression>();
for (JExpression expr : exprs) {
result.add(cloneExpression(expr));
}
return result;
}
@Override
public boolean visit(JAbsentArrayDimension x, Context ctx) {
expression = x;
return false;
}
@Override
public boolean visit(JArrayLength x, Context ctx) {
expression = new JArrayLength(x.getSourceInfo(), cloneExpression(x.getInstance()));
return false;
}
@Override
public boolean visit(JArrayRef x, Context ctx) {
expression =
new JArrayRef(x.getSourceInfo(), cloneExpression(x.getInstance()), cloneExpression(x
.getIndexExpr()));
return false;
}
@Override
public boolean visit(JBinaryOperation x, Context ctx) {
expression =
new JBinaryOperation(x.getSourceInfo(), x.getType(), x.getOp(),
cloneExpression(x.getLhs()), cloneExpression(x.getRhs()));
return false;
}
@Override
public boolean visit(JBooleanLiteral x, Context ctx) {
expression = x;
return false;
}
@Override
public boolean visit(JCastOperation x, Context ctx) {
expression =
new JCastOperation(x.getSourceInfo(), x.getCastType(), cloneExpression(x.getExpr()));
return false;
}
@Override
public boolean visit(JCharLiteral x, Context ctx) {
expression = x;
return false;
}
@Override
public boolean visit(JClassLiteral x, Context ctx) {
expression = x;
return false;
}
@Override
public boolean visit(JConditional x, Context ctx) {
expression =
new JConditional(x.getSourceInfo(), x.getType(), cloneExpression(x.getIfTest()),
cloneExpression(x.getThenExpr()), cloneExpression(x.getElseExpr()));
return false;
}
@Override
public boolean visit(JDoubleLiteral x, Context ctx) {
expression = x;
return false;
}
@Override
public boolean visit(JFieldRef x, Context ctx) {
expression =
new JFieldRef(x.getSourceInfo(), cloneExpression(x.getInstance()), x.getField(), x
.getEnclosingType());
return false;
}
@Override
public boolean visit(JFloatLiteral x, Context ctx) {
expression = x;
return false;
}
@Override
public boolean visit(JGwtCreate x, Context ctx) {
// Clone the internal instantiation expressions directly.
ArrayList<JExpression> clonedExprs = new ArrayList<JExpression>();
for (JExpression expr : x.getInstantiationExpressions()) {
clonedExprs.add(cloneExpression(expr));
}
// Use the clone constructor.
JGwtCreate gwtCreate =
new JGwtCreate(x.getSourceInfo(), x.getSourceType(), x.getResultTypes(), x.getType(),
cloneExpressions(x.getInstantiationExpressions()));
expression = gwtCreate;
return false;
}
@Override
public boolean visit(JInstanceOf x, Context ctx) {
expression = new JInstanceOf(x.getSourceInfo(), x.getTestType(), cloneExpression(x.getExpr()));
return false;
}
@Override
public boolean visit(JIntLiteral x, Context ctx) {
expression = x;
return false;
}
@Override
public boolean visit(JLocalRef x, Context ctx) {
expression = new JLocalRef(x.getSourceInfo(), x.getLocal());
return false;
}
@Override
public boolean visit(JLongLiteral x, Context ctx) {
expression = x;
return false;
}
@Override
public boolean visit(JMethodCall x, Context ctx) {
JMethodCall newMethodCall = new JMethodCall(x, cloneExpression(x.getInstance()));
newMethodCall.addArgs(cloneExpressions(x.getArgs()));
expression = newMethodCall;
return false;
}
@Override
public boolean visit(JRunAsync x, Context ctx) {
// Only the runAsync call itself needs cloning, the onSuccess can be shared.
JExpression runAsyncCall = cloneExpression(x.getRunAsyncCall());
expression =
new JRunAsync(x.getSourceInfo(), x.getSplitPoint(), x.getName(), runAsyncCall, x
.getOnSuccessCall());
return false;
}
@Override
public boolean visit(JMultiExpression x, Context ctx) {
JMultiExpression multi = new JMultiExpression(x.getSourceInfo());
multi.exprs.addAll(cloneExpressions(x.exprs));
expression = multi;
return false;
}
@Override
public boolean visit(JNameOf x, Context ctx) {
expression =
new JNameOf(x.getSourceInfo(), (JClassType) x.getType().getUnderlyingType(), x.getNode());
return false;
}
@Override
public boolean visit(JNewArray x, Context ctx) {
expression =
new JNewArray(x.getSourceInfo(), x.getArrayType(), cloneExpressions(x.dims),
cloneExpressions(x.initializers), x.getClassLiterals());
return false;
}
@Override
public boolean visit(JNewInstance x, Context ctx) {
JNewInstance newInstance = new JNewInstance(x);
newInstance.addArgs(cloneExpressions(x.getArgs()));
expression = newInstance;
return false;
}
@Override
public boolean visit(JNullLiteral x, Context ctx) {
expression = x;
return false;
}
@Override
public boolean visit(JParameterRef x, Context ctx) {
expression = new JParameterRef(x.getSourceInfo(), x.getParameter());
return false;
}
@Override
public boolean visit(JPostfixOperation x, Context ctx) {
expression = new JPostfixOperation(x.getSourceInfo(), x.getOp(), cloneExpression(x.getArg()));
return false;
}
@Override
public boolean visit(JPrefixOperation x, Context ctx) {
expression = new JPrefixOperation(x.getSourceInfo(), x.getOp(), cloneExpression(x.getArg()));
return false;
}
@Override
public boolean visit(JsniFieldRef x, Context ctx) {
expression = x;
return false;
}
@Override
public boolean visit(JsniMethodRef x, Context ctx) {
expression = x;
return false;
}
@Override
public boolean visit(JStringLiteral x, Context ctx) {
expression = x;
return false;
}
@Override
public boolean visit(JThisRef x, Context ctx) {
expression = new JThisRef(x.getSourceInfo(), x.getClassType());
return false;
}
}