/*
* 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.ast.Context;
import com.google.gwt.dev.jjs.ast.JBooleanLiteral;
import com.google.gwt.dev.jjs.ast.JCharLiteral;
import com.google.gwt.dev.jjs.ast.JDoubleLiteral;
import com.google.gwt.dev.jjs.ast.JFloatLiteral;
import com.google.gwt.dev.jjs.ast.JIntLiteral;
import com.google.gwt.dev.jjs.ast.JLongLiteral;
import com.google.gwt.dev.jjs.ast.JNullLiteral;
import com.google.gwt.dev.jjs.ast.JStringLiteral;
import com.google.gwt.dev.jjs.ast.JVisitor;
import com.google.gwt.dev.js.ast.JsArrayLiteral;
import com.google.gwt.dev.js.ast.JsProgram;
import com.google.gwt.dev.js.ast.JsVisitable;
import com.google.gwt.lang.LongLib;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Stack;
/**
* Translates Java literals into JavaScript literals.
*/
public class GenerateJavaScriptLiterals extends JVisitor {
static {
LongLib.RUN_IN_JVM = true;
}
private final JsProgram program;
private final Stack<JsVisitable<?>> nodeStack = new Stack<JsVisitable<?>>();
public GenerateJavaScriptLiterals(JsProgram program) {
this.program = program;
}
@Override
public final void endVisit(JBooleanLiteral x, Context ctx) {
push(x.getValue() ? program.getTrueLiteral() : program.getFalseLiteral());
}
@Override
public final void endVisit(JCharLiteral x, Context ctx) {
push(program.getNumberLiteral(x.getSourceInfo(), x.getValue()));
}
@Override
public final void endVisit(JDoubleLiteral x, Context ctx) {
push(program.getNumberLiteral(x.getSourceInfo(), x.getValue()));
}
@Override
public final void endVisit(JFloatLiteral x, Context ctx) {
push(program.getNumberLiteral(x.getSourceInfo(), x.getValue()));
}
@Override
public final void endVisit(JIntLiteral x, Context ctx) {
push(program.getNumberLiteral(x.getSourceInfo(), x.getValue()));
}
@Override
public void endVisit(JLongLiteral x, Context ctx) {
JsArrayLiteral arrayLit = new JsArrayLiteral(x.getSourceInfo());
double[] doubleArray = LongLib.typeChange(x.getValue());
arrayLit.getExpressions().add(
program.getNumberLiteral(x.getSourceInfo(), doubleArray[0]));
arrayLit.getExpressions().add(
program.getNumberLiteral(x.getSourceInfo(), doubleArray[1]));
push(arrayLit);
}
@Override
public final void endVisit(JNullLiteral x, Context ctx) {
push(program.getNullLiteral());
}
@Override
public final void endVisit(JStringLiteral x, Context ctx) {
push(program.getStringLiteral(x.getSourceInfo(), x.getValue()));
}
@SuppressWarnings("unchecked")
public final <T extends JsVisitable> T peek() {
return (T) nodeStack.peek();
}
@SuppressWarnings("unchecked")
protected final <T extends JsVisitable> T pop() {
return (T) nodeStack.pop();
}
@SuppressWarnings("unchecked")
protected final <T extends JsVisitable> List<T> popList(int count) {
List<T> list = new ArrayList<T>();
while (count > 0) {
T item = this.<T> pop();
if (item != null) {
list.add(item);
}
--count;
}
Collections.reverse(list);
return list;
}
@SuppressWarnings("unchecked")
protected final <T extends JsVisitable> void popList(List<T> collection,
int count) {
List<T> list = new ArrayList<T>();
while (count > 0) {
T item = this.<T> pop();
if (item != null) {
list.add(item);
}
--count;
}
Collections.reverse(list);
collection.addAll(list);
}
@SuppressWarnings("unchecked")
protected final <T extends JsVisitable> void push(T node) {
nodeStack.push(node);
}
}