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A strong typed high performance Java Template engine with .Net Razor like syntax
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/* 
 * Copyright (C) 2013 The Rythm Engine project
 * Gelin Luo 
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.rythmengine.internal.parser.build_in;

import org.rythmengine.internal.IContext;
import org.rythmengine.internal.IParser;
import org.rythmengine.internal.Keyword;
import org.rythmengine.internal.Token;
import org.rythmengine.internal.parser.CodeToken;
import org.rythmengine.internal.parser.IRemoveLeadingLineBreakAndSpaces;
import org.rythmengine.internal.parser.ParserBase;
import org.rythmengine.utils.TextBuilder;
import com.stevesoft.pat.Regex;

/**
 * Created by IntelliJ IDEA.
 * User: luog
 * Date: 19/02/12
 * Time: 5:28 PM
 * To change this template use File | Settings | File Templates.
 */
public class DebugParser extends KeywordParserFactory implements IRemoveLeadingLineBreakAndSpaces {

    @Override
    public Keyword keyword() {
        return Keyword.DEBUG;
    }

    public IParser create(final IContext ctx) {
        return new ParserBase(ctx) {
            public Token go() {
                Regex r = reg(dialect());
                if (!r.search(remain())) {
                    raiseParseException("error parsing @debug, correct usage: @debug(\"msg\", args...)");
                }
                String matched = r.stringMatched();
                step(matched.length());
                boolean leadLB = matched.startsWith("\n"), afterLB = matched.endsWith("\n");
                if (leadLB || afterLB) {
                    ctx.getCodeBuilder().addBuilder(new Token.StringToken("\n", ctx));
                    if (!(leadLB && afterLB)) {
                        Regex r0 = new Regex("\\n([ \\t\\x0B\\f]*).*");
                        if (r0.search(matched)) {
                            String blank = r0.stringMatched(1);
                            if (blank.length() > 0) {
                                ctx.getCodeBuilder().addBuilder(new Token.StringToken(blank, ctx));
                            }
                        }
                    }
                } else {
                    Regex r0 = new Regex("([ \\t\\x0B\\f]*).*");
                    if (r0.search(matched)) {
                        String blank = r0.stringMatched(1);
                        if (blank.length() > 0) {
                            ctx.getCodeBuilder().addBuilder(new Token.StringToken(blank, ctx));
                        }
                    }
                }
                String s = new TextBuilder().p("__logger.debug").p(r.stringMatched(2)).p(";").toString();
                return new CodeToken(s, ctx());
            }
        };
    }

    @Override
    protected String patternStr() {
        return "(^\\n?[ \\t\\x0B\\f]*%s%s\\s*((?@()))[\\n]?)";
    }

}