/*
* 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.core.ext.PropertyOracle;
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 {
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, PropertyOracle[] propertyOracles) {
this.program = program;
referenced = collectReferencedNames(program);
reserved = new ReservedNames(propertyOracles);
}
protected final void execImpl() {
reset();
visit(program.getScope());
reset();
visit(program.getObjectScope());
}
protected abstract void reset();
protected abstract void visit(JsScope scope);
}