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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 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.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;

import javax.annotation.Nullable;

/**
 * A compact-printer for {@link CssTree} instances.
 */
public class CompactPrinter extends CodePrinter {

    private String compactedPrintedString = null;

    public CompactPrinter(
            CssNode subtree, @Nullable CodeBuffer buffer, @Nullable GssSourceMapGenerator generator) {
        super(subtree.getVisitController(), buffer, generator);
    }

    public CompactPrinter(CssNode subtree, @Nullable CodeBuffer buffer) {
        this(subtree, buffer, null /* generator */);
    }

    public CompactPrinter(CssNode subtree) {
        this(subtree, null /* buffer */);
    }

    public CompactPrinter(
            CssTree tree, @Nullable CodeBuffer buffer, @Nullable GssSourceMapGenerator generator) {
        super(tree.getVisitController(), buffer, generator);
    }

    public CompactPrinter(CssTree tree, CodeBuffer buffer) {
        this(tree, buffer, null /* generator */);
    }

    public CompactPrinter(CssTree tree, GssSourceMapGenerator generator) {
        this(tree, null /* buffer */, generator);
    }

    public CompactPrinter(CssTree tree) {
        this(tree, null /* buffer */, null /* generator */);
    }

    @Override
    protected CssTreeVisitor createVisitor(VisitController visitController, CodeBuffer buffer) {
        return new CompactPrintingVisitor(visitController, buffer);
    }

    /**
     * Returns the CSS compacted printed output.
     */
    public String getCompactPrintedString() {
        return compactedPrintedString;
    }

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

    public static String printCompactly(CssNode n) {
        CompactPrinter p = new CompactPrinter(n);
        p.runPass();
        return p.getCompactPrintedString().trim();
    }

    public static String printCompactly(CssTree t) {
        return printCompactly(t.getRoot());
    }
}