<?php
/*
    "Contact Form to Database" Copyright (C) 2011-2013 Michael Simpson  (email : michael.d.simpson@gmail.com)

    This file is part of Contact Form to Database.

    Contact Form to Database is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    Contact Form to Database is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with Contact Form to Database.
    If not, see <http://www.gnu.org/licenses/>.
*/


class CFDBShortCodeContentParser {

    const BEFORE_START_DELIMITER = '{{BEFORE}}';
    const BEFORE_END_DELIMITER = '{{/BEFORE}}';

    const AFTER_START_DELIMITER = '{{AFTER}}';
    const AFTER_END_DELIMITER = '{{/AFTER}}';

    /**
     * @param $content string
     * @return array[$before, $template, $after]
     */
    public function parseBeforeContentAfter($content) {
        $before = null;
        $startDelimiter = self::BEFORE_START_DELIMITER;
        $endDelimiter = self::BEFORE_END_DELIMITER;
        $startDelimiterStartPos = strpos($content, $startDelimiter);
        $endDelimiterStartPos = strpos($content, $endDelimiter);
        if ($startDelimiterStartPos !== false &&
                $endDelimiterStartPos !== false &&
                $startDelimiterStartPos < $endDelimiterStartPos) {
            $startDelimiterEndPos = $startDelimiterStartPos + strlen($startDelimiter);
            $endDelimiterEndPos = $endDelimiterStartPos + strlen($endDelimiter);
            $before = substr($content, $startDelimiterEndPos, $endDelimiterStartPos - $startDelimiterEndPos);
            $content = substr($content, $endDelimiterEndPos, strlen($content) - $startDelimiterEndPos);
        }

        $after = null;
        $startDelimiter = self::AFTER_START_DELIMITER;
        $endDelimiter = self::AFTER_END_DELIMITER;
        $startDelimiterStartPos = strpos($content, $startDelimiter);
        $endDelimiterStartPos = strpos($content, $endDelimiter);
        if ($startDelimiterStartPos !== false &&
                $endDelimiterStartPos !== false &&
                $startDelimiterStartPos < $endDelimiterStartPos) {
            $startDelimiterEndPos = $startDelimiterStartPos + strlen($startDelimiter);
            $after = substr($content, $startDelimiterEndPos, $endDelimiterStartPos - $startDelimiterEndPos);
            $content = substr($content, 0, $startDelimiterStartPos);
        }

        return array($before, $content, $after);
    }

}