File class\libraries\vendor\xoops\xmf\src\Highlighter.php

1:	<?php
2:	/*
3:	You may not change or alter any portion of this comment or credits
4:	of supporting developers from this source code or any supporting source code
5:	which is considered copyrighted (c) material of the original comment or credit authors.
6:
7:	This program is distributed in the hope that it will be useful,
8:	but WITHOUT ANY WARRANTY; without even the implied warranty of
9:	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
10:	*/
11:
12:	namespace Xmf;
13:
14:	/**
15:	* Highlighter
16:	*
17:	* @category Xmf\Highlighter
18:	* @package Xmf
19:	* @author Richard Griffith <richard@geekwright.com>
20:	* @copyright 2011-2018 XOOPS Project (https://xoops.org)
21:	* @license GNU GPL 2.0 or later (https://www.gnu.org/licenses/gpl-2.0.html)
22:	* @link https://xoops.org
23:	*/
24:	class Highlighter
25:	{
26:	/**
27:	* mbstring encoding
28:	*/
29:	const ENCODING = 'UTF-8';
30:
31:	/**
32:	* Apply highlight to words in body text
33:	*
34:	* Surround occurrences of words in body with pre in front and post
35:	* behind. Considers only occurrences of words outside of HTML tags.
36:	*
37:	* @param string\|string[] $words words to highlight
38:	* @param string $body body of html text to highlight
39:	* @param string $pre string to begin a highlight
40:	* @param string $post string to end a highlight
41:	*
42:	* @return string highlighted body
43:	*/
44:	public static function apply($words, $body, $pre = '<mark>', $post = '</mark>')
45:	{
46:	if (!is_array($words)) {
47:	$words = preg_replace('/[\s]+/', ' ', $words);
48:	$words = explode(' ', $words);
49:	}
50:	foreach ($words as $word) {
51:	$body = static::splitOnTag($word, $body, $pre, $post);
52:	}
53:
54:	return $body;
55:	}
56:
57:	/**
58:	* find needle in between html tags and add highlighting
59:	*
60:	* @param string $needle string to find
61:	* @param string $haystack html text to find needle in
62:	* @param string $pre insert before needle
63:	* @param string $post insert after needle
64:	*
65:	* @return mixed return from preg_replace_callback()
66:	*/
67:	protected static function splitOnTag($needle, $haystack, $pre, $post)
68:	{
69:	$encoding = static::ENCODING;
70:	return preg_replace_callback(
71:	'#((?:(?!<[/a-z]).))([^>]>\|$)#si',
72:	function ($capture) use ($needle, $pre, $post, $encoding) {
73:	$haystack = $capture[1];
74:	if (function_exists('mb_substr')) {
75:	$p1 = mb_stripos($haystack, $needle, 0, $encoding);
76:	$l1 = mb_strlen($needle, $encoding);
77:	$ret = '';
78:	while ($p1 !== false) {
79:	$ret .= mb_substr($haystack, 0, $p1, $encoding) . $pre
80:	. mb_substr($haystack, $p1, $l1, $encoding) . $post;
81:	$haystack = mb_substr($haystack, $p1 + $l1, mb_strlen($haystack), $encoding);
82:	$p1 = mb_stripos($haystack, $needle, 0, $encoding);
83:	}
84:	} else {
85:	$p1 = stripos($haystack, $needle);
86:	$l1 = strlen($needle);
87:	$ret = '';
88:	while ($p1 !== false) {
89:	$ret .= substr($haystack, 0, $p1) . $pre . substr($haystack, $p1, $l1) . $post;
90:	$haystack = substr($haystack, $p1 + $l1);
91:	$p1 = stripos($haystack, $needle);
92:	}
93:	}
94:	$ret .= $haystack . $capture[2];
95:
96:	return $ret;
97:	},
98:	$haystack
99:	);
100:	}
101:	}
102:

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