// Copyright (C) 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.caja.parser.js;
import com.google.caja.lexer.FilePosition;
import com.google.caja.lexer.TokenConsumer;
import com.google.caja.parser.ParseTreeNode;
import com.google.caja.render.Concatenator;
import com.google.caja.render.JsMinimalPrinter;
import com.google.caja.render.JsPrettyPrinter;
import com.google.caja.reporting.RenderContext;
import com.google.javascript.jscomp.jsonml.JsonML;
import java.util.List;
/**
* A RenderedExpression is a Javascript expression tree rendered as a string,
* which is cheaper to clone and/or cache than an actual ParseTreeNode tree.
* <p>
* Used by {@link CajoledModule#flattenProperty}.
*/
public final class RenderedExpression extends AbstractExpression {
private static final long serialVersionUID = 1L;
private final String value;
@ReflectiveCtor
public RenderedExpression(FilePosition pos, String value, List<?> children) {
this(pos, value);
assert children.isEmpty();
}
public RenderedExpression(ParseTreeNode n, boolean minify) {
this(render(n, minify));
}
public RenderedExpression(String value) {
this(FilePosition.UNKNOWN, value);
}
public RenderedExpression(FilePosition pos, String value) {
super(pos, RenderedExpression.class);
this.value = value;
}
@Override
public Object getValue() {
return value;
}
@Override
public String typeOf() {
return null;
}
@Override
public void render(RenderContext r) {
r.getOut().consume(value);
}
@Override
public JsonML toJsonML() {
throw new UnsupportedOperationException();
}
private static String render(ParseTreeNode n, boolean minify) {
StringBuilder buf = new StringBuilder();
TokenConsumer tc;
if (minify) {
tc = new JsMinimalPrinter(new Concatenator(buf));
} else {
tc = new JsPrettyPrinter(new Concatenator(buf));
}
RenderContext rc = new RenderContext(tc);
n.render(rc);
tc.noMoreTokens();
return buf.toString();
}
}