com.google.common.css.compiler.passes.SplitRulesetNodes.java Source code

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Here is the source code for com.google.common.css.compiler.passes.SplitRulesetNodes.java

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/*
 * Copyright 2009 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.collect.Lists;
import com.google.common.css.compiler.ast.CssCompilerPass;
import com.google.common.css.compiler.ast.CssDeclarationBlockNode;
import com.google.common.css.compiler.ast.CssNode;
import com.google.common.css.compiler.ast.CssRulesetNode;
import com.google.common.css.compiler.ast.CssSelectorListNode;
import com.google.common.css.compiler.ast.CssSelectorNode;
import com.google.common.css.compiler.ast.MutatingVisitController;
import com.google.common.css.compiler.ast.SkippingTreeVisitor;

import java.util.List;

/**
 * Compiler pass that splits ruleset nodes into multiple ruleset nodes by
 * selector and declaration.
 *
 * @author oana@google.com (Oana Florescu)
 */
public class SplitRulesetNodes extends SkippingTreeVisitor implements CssCompilerPass {

    private final MutatingVisitController visitController;

    public SplitRulesetNodes(MutatingVisitController visitController) {
        this(visitController, false);
    }

    public SplitRulesetNodes(MutatingVisitController visitController, boolean skipping) {
        super(skipping);
        this.visitController = visitController;
    }

    @Override
    public boolean enterRuleset(CssRulesetNode node) {
        boolean canModifyRuleset = canModifyRuleset(node);
        if (canModifyRuleset) {
            List<CssNode> replacementNodes = Lists.newArrayList();

            CssSelectorListNode selectors = node.getSelectors();
            CssDeclarationBlockNode declarations = node.getDeclarations();

            for (CssSelectorNode sel : selectors.childIterable()) {
                for (CssNode child : declarations.childIterable()) {
                    CssRulesetNode ruleset = new CssRulesetNode();
                    ruleset.addDeclaration(child.deepCopy());
                    ruleset.addSelector(sel.deepCopy());

                    replacementNodes.add(ruleset);
                }
            }

            visitController.replaceCurrentBlockChildWith(replacementNodes, false);
        }
        return canModifyRuleset;
    }

    @Override
    public void runPass() {
        visitController.startVisit(this);
    }

}