/*
* 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.common.css.compiler.passes;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.Lists;
import com.google.common.css.compiler.ast.CssCompilerPass;
import com.google.common.css.compiler.ast.CssKeyframesNode;
import com.google.common.css.compiler.ast.CssLiteralNode;
import com.google.common.css.compiler.ast.DefaultTreeVisitor;
import com.google.common.css.compiler.ast.ErrorManager;
import com.google.common.css.compiler.ast.MutatingVisitController;
/**
* Compiler pass which duplicates @keyframes rules creating browser specific
* prefixed form. A {@code @keyframes} rule preceded by these annotation
* comment will be duplicated:
* <ul>
* <li>@gen-webkit-keyframes to generate a {@code @-webkit-keyframes} rule.
* </li>
* </ul>
*
*/
public class CreateVendorPrefixedKeyframes extends DefaultTreeVisitor
implements CssCompilerPass {
private final MutatingVisitController visitController;
private final ErrorManager errorManager;
@VisibleForTesting
static final String GEN_WEBKIT_KEYFRAMES_COMMENT =
"/* @gen-webkit-keyframes */";
public CreateVendorPrefixedKeyframes(
MutatingVisitController visitController,
ErrorManager errorManager) {
this.visitController = visitController;
this.errorManager = errorManager;
}
@Override
public void leaveKeyframesRule(CssKeyframesNode node) {
if (node.hasComment(GEN_WEBKIT_KEYFRAMES_COMMENT)
&& node.getName().toString().equals("keyframes")) {
CssKeyframesNode copy = new CssKeyframesNode(
new CssLiteralNode(
"-webkit-" + node.getName().toString(),
node.getName().getSourceCodeLocation()),
node);
visitController.replaceCurrentBlockChildWith(
Lists.newArrayList(node, copy),
false /* visitTheReplacementNodes */);
}
}
@Override
public void runPass() {
visitController.startVisit(this);
}
}