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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.build_in;

import com.greenlaw110.rythm.internal.IContext;
import com.greenlaw110.rythm.internal.IParser;
import com.greenlaw110.rythm.internal.dialect.Rythm;
import com.greenlaw110.rythm.internal.parser.ParserBase;
import com.greenlaw110.rythm.utils.TextBuilder;
import com.stevesoft.pat.Regex;

/**
 * Parse invocation:
 *
 * @myMacro() Note since this is also a pattern for expression parser, InvokeMacroParser must
 * be put in front of InvokeTagParser and expression parser
 */
public class InvokeMacroParser extends CaretParserFactoryBase {

    @Override
    public IParser create(IContext ctx) {
        return new ParserBase(ctx) {

            @Override
            public TextBuilder go() {
                Regex r = new Regex(String.format(patternStr(), dialect().a()));
                if (!r.search(remain())) return null;
                String macro = r.stringMatched(2);
                if (!ctx().getCodeBuilder().hasMacro(macro)) return null;
                int curLine = currentLine();
                step(r.stringMatched().length());
                return new ExecMacroToken(macro, ctx(), curLine);
            }
        };
    }


    private static String patternStr() {
        return "^(%s([_a-zA-Z][a-zA-Z$_\\.0-9]+)[ \t]*\\([ \t]*\\))";
    }

    public static void main(String[] args) {
        InvokeMacroParser P = new InvokeMacroParser();
        Regex r = new Regex(String.format(P.patternStr(), Rythm.INSTANCE.a()));
        String s = "@ab ( )";
        p(s, r);
    }
}