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<?php
/**
* CakePHP(tm) : Rapid Development Framework (https://cakephp.org)
* Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
*
* Licensed under The MIT License
* For full copyright and license information, please see the LICENSE.txt
* Redistributions of files must retain the above copyright notice.
*
* @copyright Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
* @link https://cakephp.org CakePHP(tm) Project
* @since 0.10.0
* @license https://opensource.org/licenses/mit-license.php MIT License
*/
namespace Cake\View\Helper;
use Cake\Core\App;
use Cake\Core\Exception\Exception;
use Cake\Utility\Security;
use Cake\View\Helper;
use Cake\View\View;
/**
* Text helper library.
*
* Text manipulations: Highlight, excerpt, truncate, strip of links, convert email addresses to mailto: links...
*
* @property \Cake\View\Helper\HtmlHelper $Html
* @link https://book.cakephp.org/3.0/en/views/helpers/text.html
* @see \Cake\Utility\Text
*/
class TextHelper extends Helper
{
/**
* helpers
*
* @var array
*/
public $helpers = ['Html'];
/**
* Default config for this class
*
* @var array
*/
protected $_defaultConfig = [
'engine' => 'Cake\Utility\Text'
];
/**
* An array of hashes and their contents.
* Used when inserting links into text.
*
* @var array
*/
protected $_placeholders = [];
/**
* Cake Utility Text instance
*
* @var \Cake\Utility\Text
*/
protected $_engine;
/**
* Constructor
*
* ### Settings:
*
* - `engine` Class name to use to replace String functionality.
* The class needs to be placed in the `Utility` directory.
*
* @param \Cake\View\View $View the view object the helper is attached to.
* @param array $config Settings array Settings array
* @throws \Cake\Core\Exception\Exception when the engine class could not be found.
*/
public function __construct(View $View, array $config = [])
{
parent::__construct($View, $config);
$config = $this->_config;
$engineClass = App::className($config['engine'], 'Utility');
if ($engineClass) {
$this->_engine = new $engineClass($config);
} else {
throw new Exception(sprintf('Class for %s could not be found', $config['engine']));
}
}
/**
* Call methods from String utility class
*
* @param string $method Method to invoke
* @param array $params Array of params for the method.
* @return mixed Whatever is returned by called method, or false on failure
*/
public function __call($method, $params)
{
return call_user_func_array([$this->_engine, $method], $params);
}
/**
* Adds links (<a href=....) to a given text, by finding text that begins with
* strings like http:// and ftp://.
*
* ### Options
*
* - `escape` Control HTML escaping of input. Defaults to true.
*
* @param string $text Text
* @param array $options Array of HTML options, and options listed above.
* @return string The text with links
* @link https://book.cakephp.org/3.0/en/views/helpers/text.html#linking-urls
*/
public function autoLinkUrls($text, array $options = [])
{
$this->_placeholders = [];
$options += ['escape' => true];
$pattern = '/(?:(?<!href="|src="|">)
(?>
(
(?<left>[\[<(]) # left paren,brace
(?>
# Lax match URL
(?<url>(?:https?|ftp|nntp):\/\/[\p{L}0-9.\-_:]+(?:[\/?][\p{L}0-9.\-_:\/?=&>\[\]\(\)\#\@\+~!;,%]+[^-_:?>\[\(\@\+~!;<,.%\s])?)
(?<right>[\])>]) # right paren,brace
)
)
|
(?<url_bare>(?P>url)) # A bare URL. Use subroutine
)
)/ixu';
$text = preg_replace_callback(
$pattern,
[&$this, '_insertPlaceHolder'],
$text
);
$text = preg_replace_callback(
'#(?<!href="|">)(?<!\b[[:punct:]])(?<!http://|https://|ftp://|nntp://)www\.[^\s\n\%\ <]+[^\s<\n\%\,\.\ <](?<!\))#i',
[&$this, '_insertPlaceHolder'],
$text
);
if ($options['escape']) {
$text = h($text);
}
return $this->_linkUrls($text, $options);
}
/**
* Saves the placeholder for a string, for later use. This gets around double
* escaping content in URL's.
*
* @param array $matches An array of regexp matches.
* @return string Replaced values.
*/
protected function _insertPlaceHolder($matches)
{
$match = $matches[0];
$envelope = ['', ''];
if (isset($matches['url'])) {
$match = $matches['url'];
$envelope = [$matches['left'], $matches['right']];
}
if (isset($matches['url_bare'])) {
$match = $matches['url_bare'];
}
$key = hash_hmac('sha1', $match, Security::getSalt());
$this->_placeholders[$key] = [
'content' => $match,
'envelope' => $envelope
];
return $key;
}
/**
* Replace placeholders with links.
*
* @param string $text The text to operate on.
* @param array $htmlOptions The options for the generated links.
* @return string The text with links inserted.
*/
protected function _linkUrls($text, $htmlOptions)
{
$replace = [];
foreach ($this->_placeholders as $hash => $content) {
$link = $url = $content['content'];
$envelope = $content['envelope'];
if (!preg_match('#^[a-z]+\://#i', $url)) {
$url = 'http://' . $url;
}
$replace[$hash] = $envelope[0] . $this->Html->link($link, $url, $htmlOptions) . $envelope[1];
}
return strtr($text, $replace);
}
/**
* Links email addresses
*
* @param string $text The text to operate on
* @param array $options An array of options to use for the HTML.
* @return string
* @see \Cake\View\Helper\TextHelper::autoLinkEmails()
*/
protected function _linkEmails($text, $options)
{
$replace = [];
foreach ($this->_placeholders as $hash => $content) {
$url = $content['content'];
$envelope = $content['envelope'];
$replace[$hash] = $envelope[0] . $this->Html->link($url, 'mailto:' . $url, $options) . $envelope[1];
}
return strtr($text, $replace);
}
/**
* Adds email links (<a href="mailto:....) to a given text.
*
* ### Options
*
* - `escape` Control HTML escaping of input. Defaults to true.
*
* @param string $text Text
* @param array $options Array of HTML options, and options listed above.
* @return string The text with links
* @link https://book.cakephp.org/3.0/en/views/helpers/text.html#linking-email-addresses
*/
public function autoLinkEmails($text, array $options = [])
{
$options += ['escape' => true];
$this->_placeholders = [];
$atom = '[\p{L}0-9!#$%&\'*+\/=?^_`{|}~-]';
$text = preg_replace_callback(
'/(?<=\s|^|\(|\>|\;)(' . $atom . '*(?:\.' . $atom . '+)*@[\p{L}0-9-]+(?:\.[\p{L}0-9-]+)+)/ui',
[&$this, '_insertPlaceholder'],
$text
);
if ($options['escape']) {
$text = h($text);
}
return $this->_linkEmails($text, $options);
}
/**
* Convert all links and email addresses to HTML links.
*
* ### Options
*
* - `escape` Control HTML escaping of input. Defaults to true.
*
* @param string $text Text
* @param array $options Array of HTML options, and options listed above.
* @return string The text with links
* @link https://book.cakephp.org/3.0/en/views/helpers/text.html#linking-both-urls-and-email-addresses
*/
public function autoLink($text, array $options = [])
{
$text = $this->autoLinkUrls($text, $options);
return $this->autoLinkEmails($text, ['escape' => false] + $options);
}
/**
* Highlights a given phrase in a text. You can specify any expression in highlighter that
* may include the \1 expression to include the $phrase found.
*
* @param string $text Text to search the phrase in
* @param string $phrase The phrase that will be searched
* @param array $options An array of HTML attributes and options.
* @return string The highlighted text
* @see \Cake\Utility\Text::highlight()
* @link https://book.cakephp.org/3.0/en/views/helpers/text.html#highlighting-substrings
*/
public function highlight($text, $phrase, array $options = [])
{
return $this->_engine->highlight($text, $phrase, $options);
}
/**
* Formats paragraphs around given text for all line breaks
* <br /> added for single line return
* <p> added for double line return
*
* @param string $text Text
* @return string The text with proper <p> and <br /> tags
* @link https://book.cakephp.org/3.0/en/views/helpers/text.html#converting-text-into-paragraphs
*/
public function autoParagraph($text)
{
if (trim($text) !== '') {
$text = preg_replace('|<br[^>]*>\s*<br[^>]*>|i', "\n\n", $text . "\n");
$text = preg_replace("/\n\n+/", "\n\n", str_replace(["\r\n", "\r"], "\n", $text));
$texts = preg_split('/\n\s*\n/', $text, -1, PREG_SPLIT_NO_EMPTY);
$text = '';
foreach ($texts as $txt) {
$text .= '<p>' . nl2br(trim($txt, "\n")) . "</p>\n";
}
$text = preg_replace('|<p>\s*</p>|', '', $text);
}
return $text;
}
/**
* Strips given text of all links (<a href=....)
*
* @param string $text Text
* @return string The text without links
* @see \Cake\Utility\Text::stripLinks()
* @link https://book.cakephp.org/3.0/en/views/helpers/text.html#removing-links
*/
public function stripLinks($text)
{
return $this->_engine->stripLinks($text);
}
/**
* Truncates text.
*
* Cuts a string to the length of $length and replaces the last characters
* with the ellipsis if the text is longer than length.
*
* ### Options:
*
* - `ellipsis` Will be used as Ending and appended to the trimmed string
* - `exact` If false, $text will not be cut mid-word
* - `html` If true, HTML tags would be handled correctly
*
* @param string $text String to truncate.
* @param int $length Length of returned string, including ellipsis.
* @param array $options An array of HTML attributes and options.
* @return string Trimmed string.
* @see \Cake\Utility\Text::truncate()
* @link https://book.cakephp.org/3.0/en/views/helpers/text.html#truncating-text
*/
public function truncate($text, $length = 100, array $options = [])
{
return $this->_engine->truncate($text, $length, $options);
}
/**
* Truncates text starting from the end.
*
* Cuts a string to the length of $length and replaces the first characters
* with the ellipsis if the text is longer than length.
*
* ### Options:
*
* - `ellipsis` Will be used as Beginning and prepended to the trimmed string
* - `exact` If false, $text will not be cut mid-word
*
* @param string $text String to truncate.
* @param int $length Length of returned string, including ellipsis.
* @param array $options An array of HTML attributes and options.
* @return string Trimmed string.
* @see \Cake\Utility\Text::tail()
* @link https://book.cakephp.org/3.0/en/views/helpers/text.html#truncating-the-tail-of-a-string
*/
public function tail($text, $length = 100, array $options = [])
{
return $this->_engine->tail($text, $length, $options);
}
/**
* Extracts an excerpt from the text surrounding the phrase with a number of characters on each side
* determined by radius.
*
* @param string $text String to search the phrase in
* @param string $phrase Phrase that will be searched for
* @param int $radius The amount of characters that will be returned on each side of the founded phrase
* @param string $ending Ending that will be appended
* @return string Modified string
* @see \Cake\Utility\Text::excerpt()
* @link https://book.cakephp.org/3.0/en/views/helpers/text.html#extracting-an-excerpt
*/
public function excerpt($text, $phrase, $radius = 100, $ending = '...')
{
return $this->_engine->excerpt($text, $phrase, $radius, $ending);
}
/**
* Creates a comma separated list where the last two items are joined with 'and', forming natural language.
*
* @param array $list The list to be joined.
* @param string|null $and The word used to join the last and second last items together with. Defaults to 'and'.
* @param string $separator The separator used to join all the other items together. Defaults to ', '.
* @return string The glued together string.
* @see \Cake\Utility\Text::toList()
* @link https://book.cakephp.org/3.0/en/views/helpers/text.html#converting-an-array-to-sentence-form
*/
public function toList($list, $and = null, $separator = ', ')
{
return $this->_engine->toList($list, $and, $separator);
}
/**
* Event listeners.
*
* @return array
*/
public function implementedEvents()
{
return [];
}
}