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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.Keyword;
import com.greenlaw110.rythm.internal.Token;
import com.greenlaw110.rythm.internal.parser.RemoveLeadingLineBreakAndSpacesParser;
import com.greenlaw110.rythm.utils.S;
import com.greenlaw110.rythm.utils.TextBuilder;
import com.stevesoft.pat.Regex;

/**
 * Parse @exec("myMacro")
 */
public class ExecParser extends KeywordParserFactory {

    private static final String R = "(^\\n?[ \\t\\x0B\\f]*%s(%s\\s*((?@()))\\s*))";

    public ExecParser() {
    }

    protected String patternStr() {
        return R;
    }

    public IParser create(final IContext ctx) {
        return new RemoveLeadingLineBreakAndSpacesParser(ctx) {
            public TextBuilder go() {
                Regex r = reg(dialect());
                if (!r.search(remain())) {
                    raiseParseException("Error parsing @exec statement. Correct usage: @exec(myMacro)");
                }
                final int curLine = ctx().currentLine();
                final String matched = r.stringMatched();
                step(matched.length());
                if (matched.startsWith("\n") || matched.endsWith("\n")) {
                    ctx.getCodeBuilder().addBuilder(new Token.StringToken("\n", ctx));
                    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 = r.stringMatched(3);
                if (S.isEmpty(s)) {
                    raiseParseException("Error parsing @exec statement. Correct usage: @exec(\"my-macro\")");
                }
                final String macro = S.stripBraceAndQuotation(s);
                return new ExecMacroToken(macro, ctx(), curLine);
            }
        };
    }

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