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Closure Stylesheets is an extension to CSS that adds variables, functions, conditionals, and mixins to standard CSS. The tool also supports minification, linting, RTL flipping, and CSS class renaming.

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/*
 * Copyright 2010 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.css.compiler.ast.*;

/**
 * Printer for definition nodes, which outputs GSS definitions so that they can be re-parsed later.
 *
 * This pass can only be used if {@link MapChunkAwareNodesToChunk} pass has been run before.
 * Otherwise this pass won't work.
 *
 * @param  type of chunk id objects
 * @author [email protected] (Damian Gajda)
 */
public class DefinitionPrintingVisitor extends DefaultTreeVisitor {

    private final CodeBuffer buffer;
    private final T chunk;
    private boolean printDefinition;

    /**
     * Create a printer for all the definitions in the given chunk.
     */
    public DefinitionPrintingVisitor(T chunk, CodeBuffer buffer) {
        this.chunk = chunk;
        this.buffer = buffer;
    }

    @Override
    public boolean enterDefinition(CssDefinitionNode definition) {
        printDefinition = chunk.equals(definition.getChunk());
        if (printDefinition) {
            buffer.append("@def ").append(definition.getName()).append(' ');
        }
        return printDefinition;
    }

    @Override
    public void leaveDefinition(CssDefinitionNode node) {
        if (printDefinition) {
            buffer.append(";").startNewLine();
            printDefinition = false;
        }
    }

    @Override
    public boolean enterValueNode(CssValueNode node) {
        if (!printDefinition) {
            return false;
        }
        if (node instanceof CssPriorityNode) {
            buffer.deleteLastChar();
        }
        buffer.append(node);
        return true;
    }

    @Override
    public void leaveValueNode(CssValueNode node) {
        if (!printDefinition) {
            return;
        }
        buffer.append(' ');
    }

    @Override
    public boolean enterFunctionNode(CssFunctionNode node) {
        if (!printDefinition) {
            return false;
        }
        buffer.append(node.getFunctionName());
        buffer.append('(');
        return true;
    }

    @Override
    public void leaveFunctionNode(CssFunctionNode node) {
        if (!printDefinition) {
            return;
        }
        buffer.append(") ");
    }

    @Override
    public boolean enterArgumentNode(CssValueNode node) {
        if (!printDefinition) {
            return false;
        }
        // If the previous argument was a function node, then it has a trailing
        // space that needs to be removed.
        buffer.deleteLastCharIfCharIs(' ');
        buffer.append(node);
        return true;
    }
}