com.chiorichan.factory.parsers.BasicParser.java Source code

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Here is the source code for com.chiorichan.factory.parsers.BasicParser.java

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/**
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * Copyright 2016 Chiori Greene a.k.a. Chiori-chan <me@chiorichan.com>
 * All Right Reserved.
 */
package com.chiorichan.factory.parsers;

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

import org.apache.commons.lang3.Validate;

import com.chiorichan.util.StringFunc;

/**
 * Used for basic parsing of code blocks, e.g., < !-- this_is_a_method(argument) -->
 */
public abstract class BasicParser {
    private Pattern p1;
    private Pattern p2;

    public BasicParser(String patternOne, String patternTwo) {
        Validate.notEmpty(patternOne);
        Validate.notEmpty(patternTwo);

        p1 = Pattern.compile(patternOne);
        p2 = Pattern.compile(patternTwo);
    }

    public String runParser(String source) throws Exception {
        if (source == null || source.isEmpty())
            return "";

        Matcher m1 = p1.matcher(source);
        Matcher m2 = p2.matcher(source);

        while (m1.find() && m2.find()) {
            String[] args = m1.group(1).split("[ ]?,[ ]?");
            String[] args2 = new String[args.length + 1];

            args2[0] = m1.group(0);

            for (int i = 0; i < args.length; i++)
                args2[i + 1] = StringFunc.trimAll(args[i].trim(), '"');

            String result = resolveMethod(args2);

            if (result == null)
                result = "";

            source = new StringBuilder(source).replace(m2.start(1), m2.end(1), result).toString();

            // We have to reset the matcher since the source changes with each loop
            m1 = p1.matcher(source);
            m2 = p2.matcher(source);
        }

        return source;
    }

    public abstract String resolveMethod(String... args) throws Exception;
}