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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 2012 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.CssNode;
import com.google.common.css.compiler.ast.CssTree;
import com.google.common.css.compiler.ast.CssTreeVisitor;
import com.google.common.css.compiler.ast.VisitController;

/**
 * Build up an s-expression corresponding to the AST for debugging purposes.
 */
public class SExprPrinter extends CodePrinter {
    private final boolean includeHashCodes;
    private final boolean withLocationAnnotation;

    /**
     * A S-Expr printer for {@link CssNode} instances.
     */
    public SExprPrinter(CssNode subtree) {
        this(subtree, false /* includeHashCodes */, false /* withLocationAnnotation */);
    }

    /**
     * A S-Expr printer for {@link CssTree} instances.
     */
    public SExprPrinter(CssTree tree) {
        this(tree, false /* includeHashCodes */, false /* withLocationAnnotation */);
    }

    /**
     * A S-Expr printer for {@link CssNode} instances.
     *
     * @param includeHashCodes       boolean switch to include hash code for node or not.
     * @param withLocationAnnotation boolean switch to include source code location or not.
     */
    public SExprPrinter(CssNode subtree, boolean includeHashCodes, boolean withLocationAnnotation) {
        super(subtree.getVisitController(), null /* buffer */, null /* generator */);
        this.includeHashCodes = includeHashCodes;
        this.withLocationAnnotation = withLocationAnnotation;
    }

    /**
     * A S-Expr printer for {@link CssTree} instances.
     *
     * @param includeHashCodes       boolean switch to include hash code for node or not.
     * @param withLocationAnnotation boolean switch to include source code location or not.
     */
    public SExprPrinter(CssTree tree, boolean includeHashCodes, boolean withLocationAnnotation) {
        super(tree.getVisitController(), null /* buffer */, null /* generator */);
        this.includeHashCodes = includeHashCodes;
        this.withLocationAnnotation = withLocationAnnotation;
    }

    @Override
    protected CssTreeVisitor createVisitor(VisitController visitController, CodeBuffer codeBuffer) {
        SExprPrintingVisitor sExprPrintingVisitor =
                new SExprPrintingVisitor(codeBuffer, includeHashCodes, withLocationAnnotation);
        return UniformVisitor.Adapters.asCombinedVisitor(sExprPrintingVisitor);
    }

    @Override
    public void runPass() {
        resetBuffer();
        visit();
    }

    public static String print(CssTree t) {
        SExprPrinter printer = new SExprPrinter(t);
        printer.visit();
        return printer.getOutputBuffer();
    }

    public static String print(boolean includeHashCodes, boolean withLocationAnnotation, CssTree t) {
        SExprPrinter printer = new SExprPrinter(t, includeHashCodes, withLocationAnnotation);
        printer.visit();
        return printer.getOutputBuffer();
    }

    public static String print(CssNode n) {
        SExprPrinter printer = new SExprPrinter(n);
        printer.visit();
        return printer.getOutputBuffer();
    }

    public static String print(boolean includeHashCodes, boolean withLocationAnnotation, CssNode n) {
        SExprPrinter printer = new SExprPrinter(n, includeHashCodes, withLocationAnnotation);
        printer.visit();
        return printer.getOutputBuffer();
    }
}