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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.ast;

import com.google.common.collect.Sets;

import java.util.SortedSet;

/**
 * A basic error manager that sorts all errors reported to it and generate a
 * sorted report when the {@link #generateReport()} method is called.
 * (Sorting is based on {@link GssError#compareTo(GssError)}.)
 * 
 * This error manager delegates the method of output to subclasses via {@link #print(String)}.
 */
public abstract class BasicErrorManager implements ErrorManager {
    protected final SortedSet errors = Sets.newTreeSet();
    protected final SortedSet warnings = Sets.newTreeSet();

    @Override
    public void report(GssError error) {
        errors.add(error);
    }

    @Override
    public void reportWarning(GssError warning) {
        warnings.add(warning);
    }

    @Override
    public void generateReport() {
        SortedSet all = Sets.newTreeSet();
        all.addAll(warnings);
        all.addAll(errors);
        for (GssError error : all) {
            print(error.format());
        }
        if (!all.isEmpty()) {
            print(errors.size() + " error(s), " + warnings.size() + " warning(s)\n");
        }
    }

    public int getErrorCount() {
        return errors.size();
    }

    public boolean hasErrors() {
        return !errors.isEmpty();
    }

    public abstract void print(String msg);

}