// Copyright (C) 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.caja.parser.js;
import com.google.caja.lexer.FilePosition;
import com.google.caja.lexer.TokenConsumer;
import com.google.caja.parser.AbstractParseTreeNode;
import com.google.caja.parser.ParseTreeNode;
import com.google.caja.render.Concatenator;
import com.google.caja.render.JsPrettyPrinter;
import com.google.caja.reporting.RenderContext;
import com.google.caja.util.Callback;
import java.io.IOException;
import java.util.Collections;
import java.util.List;
/**
* Translates to a cajoled module which renders as: <tt>___.loadModule...</tt>.
* This is not a core JavaScript parse tree node — it is never produced by
* {@link Parser}.
*
* Legacy: still used by TracingRewriter even though there's no longer such
* things as cajoling or modules.
*
* @author erights@gmail.com
* @author ihab.awad@gmail.com
*/
public final class UncajoledModule extends AbstractParseTreeNode {
private static final long serialVersionUID = 4647984501924442035L;
/** @param value unused. This ctor is provided for reflection. */
@ReflectiveCtor
public UncajoledModule(FilePosition pos,
Void value,
List<? extends Block> children) {
this(pos, children.get(0));
assert children.size() == 1;
}
public UncajoledModule(FilePosition pos, Block body) {
super(pos, Block.class);
createMutation().appendChild(body).execute();
}
public UncajoledModule(Block body) {
this(FilePosition.UNKNOWN, body);
}
public static UncajoledModule of(ParseTreeNode node) {
if (node instanceof Block) {
return new UncajoledModule((Block) node);
} else if (node instanceof Statement) {
return new UncajoledModule(new Block(
node.getFilePosition(),
Collections.singletonList((Statement) node)));
} else if (node instanceof Expression) {
return new UncajoledModule(new Block(
node.getFilePosition(),
Collections.singletonList(new ExpressionStmt((Expression) node))));
} else {
throw new ClassCastException("Unexpected node type " + node);
}
}
@Override
protected void childrenChanged() {
super.childrenChanged();
if (children().size() != 1) {
throw new IllegalStateException(
"An UncajoledModule may only have one child");
}
ParseTreeNode module = children().get(0);
if (!(module instanceof Block)) {
throw new ClassCastException("Expected block, not " + module);
}
}
@Override
public Object getValue() { return null; }
@Override
public List<? extends Block> children() {
return childrenAs(Block.class);
}
public Block getModuleBody() { return children().get(0); }
public final TokenConsumer makeRenderer(
Appendable out, Callback<IOException> exHandler) {
return new JsPrettyPrinter(new Concatenator(out, exHandler));
}
public void render(RenderContext rc) {
TokenConsumer out = rc.getOut();
out.consume("/* Start Uncajoled Module */");
out.consume("throw");
out.consume("'Uncajoled Module must never be executed'");
out.consume(";");
getModuleBody().render(rc);
out.consume("/* End Uncajoled Module */");
}
}