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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 com.greenlaw110.rythm.internal.parser;

import com.greenlaw110.rythm.internal.IContext;
import com.greenlaw110.rythm.internal.IParser;
import com.greenlaw110.rythm.internal.IParserFactory;
import com.greenlaw110.rythm.internal.dialect.DialectBase;
import com.greenlaw110.rythm.utils.F;
import com.greenlaw110.rythm.utils.TextBuilder;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * BuildInParserDispatcher test remaining template content and try
 * to find the build in parser which is interested to the next
 * build in keyword. If one is found then the parse process is
 * passed to it. Otherwise null token is returned
 *
 * @author luog
 */
public class ParserDispatcher extends ParserBase {

    private final Pattern P;

    public ParserDispatcher(IContext context) {
        super(context);
        P = pattern("\\n?[ \\t\\x0B\\f]*%s(%s)(\\s*|\\(|\\{).*", a(), Patterns.VarName);
    }
    
    public F.T2 go2() {
        DialectBase d = (DialectBase) dialect();
        IContext c = ctx();
        Matcher m = P.matcher(remain());
        if (m.matches()) {
            String s = m.group(1);
            IParser p = d.createBuildInParser(s, c);
            if (null != p) {
                TextBuilder tb = p.go();
                if (null != tb) return F.T2(p, tb);
            }
        }
        for (IParserFactory f : d.freeParsers()) {
            IParser p = f.create(c);
            TextBuilder tb = p.go();
            if (null != tb) return F.T2(p, tb);
        }
        return null;
    }

    public TextBuilder go() {
        throw new UnsupportedOperationException();
    }

}