MarkerBasedTemplateService.php

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<?php
namespace TYPO3\CMS\Core\Service;

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */
use TYPO3\CMS\Core\Utility\GeneralUtility;

class MarkerBasedTemplateService
{
    public function getSubpart($content, $marker)
    {
        $start = strpos($content, $marker);
        if ($start === false) {
            return '';
        }
        $start += strlen($marker);
        $stop = strpos($content, $marker, $start);
        // Q: What shall get returned if no stop marker is given
        // Everything till the end or nothing?
        if ($stop === false) {
            return '';
        }
        $content = substr($content, $start, $stop - $start);
        $matches = array();
        if (preg_match('/^([^\\<]*\\-\\-\\>)(.*)(\\<\\!\\-\\-[^\\>]*)$/s', $content, $matches) === 1) {
            return $matches[2];
        }
        // Resetting $matches
        $matches = array();
        if (preg_match('/(.*)(\\<\\!\\-\\-[^\\>]*)$/s', $content, $matches) === 1) {
            return $matches[1];
        }
        // Resetting $matches
        $matches = array();
        if (preg_match('/^([^\\<]*\\-\\-\\>)(.*)$/s', $content, $matches) === 1) {
            return $matches[2];
        }

        return $content;
    }

    public function substituteSubpart($content, $marker, $subpartContent, $recursive = true, $keepMarker = false)
    {
        $start = strpos($content, $marker);
        if ($start === false) {
            return $content;
        }
        $startAM = $start + strlen($marker);
        $stop = strpos($content, $marker, $startAM);
        if ($stop === false) {
            return $content;
        }
        $stopAM = $stop + strlen($marker);
        $before = substr($content, 0, $start);
        $after = substr($content, $stopAM);
        $between = substr($content, $startAM, $stop - $startAM);
        if ($recursive) {
            $after = $this->substituteSubpart($after, $marker, $subpartContent, $recursive, $keepMarker);
        }
        if ($keepMarker) {
            $matches = array();
            if (preg_match('/^([^\\<]*\\-\\-\\>)(.*)(\\<\\!\\-\\-[^\\>]*)$/s', $between, $matches) === 1) {
                $before .= $marker . $matches[1];
                $between = $matches[2];
                $after = $matches[3] . $marker . $after;
            } elseif (preg_match('/^(.*)(\\<\\!\\-\\-[^\\>]*)$/s', $between, $matches) === 1) {
                $before .= $marker;
                $between = $matches[1];
                $after = $matches[2] . $marker . $after;
            } elseif (preg_match('/^([^\\<]*\\-\\-\\>)(.*)$/s', $between, $matches) === 1) {
                $before .= $marker . $matches[1];
                $between = $matches[2];
                $after = $marker . $after;
            } else {
                $before .= $marker;
                $after = $marker . $after;
            }
        } else {
            $matches = array();
            if (preg_match('/^(.*)\\<\\!\\-\\-[^\\>]*$/s', $before, $matches) === 1) {
                $before = $matches[1];
            }
            if (is_array($subpartContent)) {
                $matches = array();
                if (preg_match('/^([^\\<]*\\-\\-\\>)(.*)(\\<\\!\\-\\-[^\\>]*)$/s', $between, $matches) === 1) {
                    $between = $matches[2];
                } elseif (preg_match('/^(.*)(\\<\\!\\-\\-[^\\>]*)$/s', $between, $matches) === 1) {
                    $between = $matches[1];
                } elseif (preg_match('/^([^\\<]*\\-\\-\\>)(.*)$/s', $between, $matches) === 1) {
                    $between = $matches[2];
                }
            }
            $matches = array();
            // resetting $matches
            if (preg_match('/^[^\\<]*\\-\\-\\>(.*)$/s', $after, $matches) === 1) {
                $after = $matches[1];
            }
        }
        if (is_array($subpartContent)) {
            $between = $subpartContent[0] . $between . $subpartContent[1];
        } else {
            $between = $subpartContent;
        }

        return $before . $between . $after;
    }

    public function substituteSubpartArray($content, array $subpartsContent)
    {
        foreach ($subpartsContent as $subpartMarker => $subpartContent) {
            $content = $this->substituteSubpart($content, $subpartMarker, $subpartContent);
        }

        return $content;
    }

    public function substituteMarker($content, $marker, $markContent)
    {
        return str_replace($marker, $markContent, $content);
    }

    public function substituteMarkerArray($content, $markContentArray, $wrap = '', $uppercase = false, $deleteUnused = false)
    {
        if (is_array($markContentArray)) {
            $wrapArr = GeneralUtility::trimExplode('|', $wrap);
            $search = array();
            $replace = array();
            foreach ($markContentArray as $marker => $markContent) {
                if ($uppercase) {
                    // use strtr instead of strtoupper to avoid locale problems with Turkish
                    $marker = strtr($marker, 'abcdefghijklmnopqrstuvwxyz', 'ABCDEFGHIJKLMNOPQRSTUVWXYZ');
                }
                if (!empty($wrapArr)) {
                    $marker = $wrapArr[0] . $marker . $wrapArr[1];
                }
                $search[] = $marker;
                $replace[] = $markContent;
            }
            $content = str_replace($search, $replace, $content);
            unset($search, $replace);
            if ($deleteUnused) {
                if (empty($wrap)) {
                    $wrapArr = array('###', '###');
                }
                $content = preg_replace('/' . preg_quote($wrapArr[0], '/') . '([A-Z0-9_|\\-]*)' . preg_quote($wrapArr[1], '/') . '/is', '', $content);
            }
        }

        return $content;
    }

    public function substituteMarkerAndSubpartArrayRecursive($content, array $markersAndSubparts, $wrap = '', $uppercase = false, $deleteUnused = false)
    {
        $wraps = GeneralUtility::trimExplode('|', $wrap);
        $singleItems = array();
        $compoundItems = array();
        // Split markers and subparts into separate arrays
        foreach ($markersAndSubparts as $markerName => $markerContent) {
            if (is_array($markerContent)) {
                $compoundItems[] = $markerName;
            } else {
                $singleItems[$markerName] = $markerContent;
            }
        }
        $subTemplates = array();
        $subpartSubstitutes = array();
        // Build a cache for the sub template
        foreach ($compoundItems as $subpartMarker) {
            if ($uppercase) {
                // Use strtr instead of strtoupper to avoid locale problems with Turkish
                $subpartMarker = strtr($subpartMarker, 'abcdefghijklmnopqrstuvwxyz', 'ABCDEFGHIJKLMNOPQRSTUVWXYZ');
            }
            if (!empty($wraps)) {
                $subpartMarker = $wraps[0] . $subpartMarker . $wraps[1];
            }
            $subTemplates[$subpartMarker] = $this->getSubpart($content, $subpartMarker);
        }
        // Replace the subpart contents recursively
        foreach ($compoundItems as $subpartMarker) {
            $completeMarker = $subpartMarker;
            if ($uppercase) {
                // use strtr instead of strtoupper to avoid locale problems with Turkish
                $completeMarker = strtr($completeMarker, 'abcdefghijklmnopqrstuvwxyz', 'ABCDEFGHIJKLMNOPQRSTUVWXYZ');
            }
            if (!empty($wraps)) {
                $completeMarker = $wraps[0] . $completeMarker . $wraps[1];
            }
            if (!empty($markersAndSubparts[$subpartMarker])) {
                foreach ($markersAndSubparts[$subpartMarker] as $partialMarkersAndSubparts) {
                    $subpartSubstitutes[$completeMarker] .= $this->substituteMarkerAndSubpartArrayRecursive($subTemplates[$completeMarker],
                        $partialMarkersAndSubparts, $wrap, $uppercase, $deleteUnused);
                }
            } else {
                $subpartSubstitutes[$completeMarker] = '';
            }
        }
        // Substitute the single markers and subparts
        $result = $this->substituteSubpartArray($content, $subpartSubstitutes);
        $result = $this->substituteMarkerArray($result, $singleItems, $wrap, $uppercase, $deleteUnused);

        return $result;
    }
}