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|
<?php
/*
+-----------------------------------------------------------------------+
| This file is part of the Roundcube Webmail client |
| Copyright (C) 2009-2012, The Roundcube Dev Team |
| |
| Licensed under the GNU General Public License version 3 or |
| any later version with exceptions for skins & plugins. |
| See the README file for a full license statement. |
| |
| PURPOSE: |
| Handle string replacements based on preg_replace_callback |
+-----------------------------------------------------------------------+
| Author: Thomas Bruederli <roundcube@gmail.com> |
+-----------------------------------------------------------------------+
*/
/**
* Helper class for string replacements based on preg_replace_callback
*
* @package Framework
* @subpackage Utils
*/
class rcube_string_replacer
{
public static $pattern = '/##str_replacement_(\d+)##/';
public $mailto_pattern;
public $link_pattern;
public $linkref_index;
public $linkref_pattern;
private $values = array();
private $options = array();
private $linkrefs = array();
private $urls = array();
function __construct($options = array())
{
// Simplified domain expression for UTF8 characters handling
// Support unicode/punycode in top-level domain part
$utf_domain = '[^?&@"\'\\/()<>\s\r\t\n]+\\.?([^\\x00-\\x2f\\x3b-\\x40\\x5b-\\x60\\x7b-\\x7f]{2,}|xn--[a-zA-Z0-9]{2,})';
$url1 = '.:;,';
$url2 = 'a-zA-Z0-9%=#$@+?|!&\\/_~\\[\\]\\(\\){}\*-';
$this->link_pattern = "/([\w]+:\/\/|\W[Ww][Ww][Ww]\.|^[Ww][Ww][Ww]\.)($utf_domain([$url1]*[$url2]+)*)/";
$this->mailto_pattern = "/("
."[-\w!\#\$%&\'*+~\/^`|{}=]+(?:\.[-\w!\#\$%&\'*+~\/^`|{}=]+)*" // local-part
."@$utf_domain" // domain-part
."(\?[$url1$url2]+)?" // e.g. ?subject=test...
.")/";
$this->linkref_index = '/\[([^\]#]+)\](:?\s*##str_replacement_(\d+)##)/';
$this->linkref_pattern = '/\[([^\]#]+)\]/';
$this->options = $options;
}
/**
* Add a string to the internal list
*
* @param string String value
* @return int Index of value for retrieval
*/
public function add($str)
{
$i = count($this->values);
$this->values[$i] = $str;
return $i;
}
/**
* Build replacement string
*/
public function get_replacement($i)
{
return '##str_replacement_' . $i . '##';
}
/**
* Callback function used to build HTML links around URL strings
*
* @param array Matches result from preg_replace_callback
* @return int Index of saved string value
*/
public function link_callback($matches)
{
$i = -1;
$scheme = strtolower($matches[1]);
if (preg_match('!^(http|ftp|file)s?://!i', $scheme)) {
$url = $matches[1] . $matches[2];
}
else if (preg_match('/^(\W*)(www\.)$/i', $matches[1], $m)) {
$url = $m[2] . $matches[2];
$url_prefix = 'http://';
$prefix = $m[1];
}
if ($url) {
$suffix = $this->parse_url_brackets($url);
$attrib = (array)$this->options['link_attribs'];
$attrib['href'] = $url_prefix . $url;
$i = $this->add(html::a($attrib, rcube::Q($url)) . $suffix);
$this->urls[$i] = $attrib['href'];
}
// Return valid link for recognized schemes, otherwise
// return the unmodified string for unrecognized schemes.
return $i >= 0 ? $prefix . $this->get_replacement($i) : $matches[0];
}
/**
* Callback to add an entry to the link index
*/
public function linkref_addindex($matches)
{
$key = $matches[1];
$this->linkrefs[$key] = $this->urls[$matches[3]];
return $this->get_replacement($this->add('['.$key.']')) . $matches[2];
}
/**
* Callback to replace link references with real links
*/
public function linkref_callback($matches)
{
$i = 0;
if ($url = $this->linkrefs[$matches[1]]) {
$attrib = (array)$this->options['link_attribs'];
$attrib['href'] = $url;
$i = $this->add(html::a($attrib, rcube::Q($matches[1])));
}
return $i > 0 ? '['.$this->get_replacement($i).']' : $matches[0];
}
/**
* Callback function used to build mailto: links around e-mail strings
*
* @param array Matches result from preg_replace_callback
* @return int Index of saved string value
*/
public function mailto_callback($matches)
{
$href = $matches[1];
$suffix = $this->parse_url_brackets($href);
$i = $this->add(html::a('mailto:' . $href, rcube::Q($href)) . $suffix);
return $i >= 0 ? $this->get_replacement($i) : '';
}
/**
* Look up the index from the preg_replace matches array
* and return the substitution value.
*
* @param array Matches result from preg_replace_callback
* @return string Value at index $matches[1]
*/
public function replace_callback($matches)
{
return $this->values[$matches[1]];
}
/**
* Replace all defined (link|mailto) patterns with replacement string
*
* @param string $str Text
*
* @return string Text
*/
public function replace($str)
{
// search for patterns like links and e-mail addresses
$str = preg_replace_callback($this->link_pattern, array($this, 'link_callback'), $str);
$str = preg_replace_callback($this->mailto_pattern, array($this, 'mailto_callback'), $str);
// resolve link references
$str = preg_replace_callback($this->linkref_index, array($this, 'linkref_addindex'), $str);
$str = preg_replace_callback($this->linkref_pattern, array($this, 'linkref_callback'), $str);
return $str;
}
/**
* Replace substituted strings with original values
*/
public function resolve($str)
{
return preg_replace_callback(self::$pattern, array($this, 'replace_callback'), $str);
}
/**
* Fixes bracket characters in URL handling
*/
public static function parse_url_brackets(&$url)
{
// #1487672: special handling of square brackets,
// URL regexp allows [] characters in URL, for example:
// "http://example.com/?a[b]=c". However we need to handle
// properly situation when a bracket is placed at the end
// of the link e.g. "[http://example.com]"
// Yes, this is not perfect handles correctly only paired characters
// but it should work for common cases
if (preg_match('/(\\[|\\])/', $url)) {
$in = false;
for ($i=0, $len=strlen($url); $i<$len; $i++) {
if ($url[$i] == '[') {
if ($in)
break;
$in = true;
}
else if ($url[$i] == ']') {
if (!$in)
break;
$in = false;
}
}
if ($i < $len) {
$suffix = substr($url, $i);
$url = substr($url, 0, $i);
}
}
// Do the same for parentheses
if (preg_match('/(\\(|\\))/', $url)) {
$in = false;
for ($i=0, $len=strlen($url); $i<$len; $i++) {
if ($url[$i] == '(') {
if ($in)
break;
$in = true;
}
else if ($url[$i] == ')') {
if (!$in)
break;
$in = false;
}
}
if ($i < $len) {
$suffix = substr($url, $i);
$url = substr($url, 0, $i);
}
}
return $suffix;
}
}
|
