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<?php
namespace Jasny\Twig;
/**
* Text functions for Twig.
*/
class TextExtension extends \Twig_Extension
{
/**
* Return extension name
*
* @return string
*/
public function getName()
{
return 'jasny/text';
}
/**
* {@inheritdoc}
*/
public function getFilters()
{
return [
new \Twig_SimpleFilter('paragraph', [$this, 'paragraph'], ['pre_escape' => 'html', 'is_safe' => ['html']]),
new \Twig_SimpleFilter('line', [$this, 'line']),
new \Twig_SimpleFilter('less', [$this, 'less'], ['pre_escape' => 'html', 'is_safe' => ['html']]),
new \Twig_SimpleFilter('truncate', [$this, 'truncate'], ['pre_escape' => 'html', 'is_safe' => ['html']]),
new \Twig_SimpleFilter('linkify', [$this, 'linkify'], ['pre_escape' => 'html', 'is_safe' => ['html']])
];
}
/**
* Add paragraph and line breaks to text.
*
* @param string $value
* @return string
*/
public function paragraph($value)
{
if (!isset($value)) {
return null;
}
return '<p>' . preg_replace(['~\n(\s*)\n\s*~', '~(?<!</p>)\n\s*~'], ["</p>\n\$1<p>", "<br>\n"], trim($value)) .
'</p>';
}
/**
* Get a single line
*
* @param string $value
* @param int $line Line number (starts at 1)
* @return string
*/
public function line($value, $line = 1)
{
if (!isset($value)) {
return null;
}
$lines = explode("\n", $value);
return isset($lines[$line - 1]) ? $lines[$line - 1] : null;
}
/**
* Cut of text on a pagebreak.
*
* @param string $value
* @param string $replace
* @param string $break
* @return string
*/
public function less($value, $replace = '...', $break = '<!-- pagebreak -->')
{
if (!isset($value)) {
return null;
}
$pos = stripos($value, $break);
return $pos === false ? $value : substr($value, 0, $pos) . $replace;
}
/**
* Cut of text if it's to long.
*
* @param string $value
* @param int $length
* @param string $replace
* @return string
*/
public function truncate($value, $length, $replace = '...')
{
if (!isset($value)) {
return null;
}
return strlen($value) <= $length ? $value : substr($value, 0, $length - strlen($replace)) . $replace;
}
/**
* Linkify a HTTP(S) link.
*
* @param string $protocol 'http' or 'https'
* @param string $text
* @param array $links OUTPUT
* @param string $attr
* @param string $mode
* @return string
*/
protected function linkifyHttp($protocol, $text, array &$links, $attr, $mode)
{
$regexp = $mode != 'all'
? '~(?:(https?)://([^\s<>]+)|(?<!\w@)\b(www\.[^\s<>]+?\.[^\s<>]+))(?<![\.,:;\?!\'"\|])~i'
: '~(?:(https?)://([^\s<>]+)|(?<!\w@)\b([^\s<>@]+?\.[^\s<>]+)(?<![\.,:]))~i';
return preg_replace_callback($regexp, function ($match) use ($protocol, &$links, $attr) {
if ($match[1]) $protocol = $match[1];
$link = $match[2] ?: $match[3];
return '<' . array_push($links, '<a' . $attr . ' href="' . $protocol . '://' . $link . '">'
. rtrim($link, '/') . '</a>') . '>';
}, $text);
}
/**
* Linkify a mail link.
*
* @param string $text
* @param array $links OUTPUT
* @param string $attr
* @return string
*/
protected function linkifyMail($text, array &$links, $attr)
{
$regexp = '~([^\s<>]+?@[^\s<>]+?\.[^\s<>]+)(?<![\.,:;\?!\'"\|])~';
return preg_replace_callback($regexp, function ($match) use (&$links, $attr) {
return '<' . array_push($links, '<a' . $attr . ' href="mailto:' . $match[1] . '">' . $match[1] . '</a>')
. '>';
}, $text);
}
/**
* Linkify a link.
*
* @param string $protocol
* @param string $text
* @param array $links OUTPUT
* @param string $attr
* @param string $mode
* @return string
*/
protected function linkifyOther($protocol, $text, array &$links, $attr, $mode)
{
if (strpos($protocol, ':') === false) {
$protocol .= in_array($protocol, ['ftp', 'tftp', 'ssh', 'scp']) ? '://' : ':';
}
$regexp = $mode != 'all'
? '~' . preg_quote($protocol, '~') . '([^\s<>]+)(?<![\.,:;\?!\'"\|])~i'
: '~([^\s<>]+)(?<![\.,:])~i';
return preg_replace_callback($regexp, function ($match) use ($protocol, &$links, $attr) {
return '<' . array_push($links, '<a' . $attr . ' href="' . $protocol . $match[1] . '">' . $match[1]
. '</a>') . '>';
}, $text);
}
/**
* Turn all URLs in clickable links.
*
* @param string $value
* @param array $protocols 'http'/'https', 'mail' and also 'ftp', 'scp', 'tel', etc
* @param array $attributes HTML attributes for the link
* @param string $mode normal or all
* @return string
*/
public function linkify($value, $protocols = ['http', 'mail'], array $attributes = [], $mode = 'normal')
{
if (!isset($value)) {
return null;
}
// Link attributes
$attr = '';
foreach ($attributes as $key => $val) {
$attr .= ' ' . $key . '="' . htmlentities($val) . '"';
}
$links = [];
// Extract existing links and tags
$text = preg_replace_callback('~(<a .*?>.*?</a>|<.*?>)~i', function ($match) use (&$links) {
return '<' . array_push($links, $match[1]) . '>';
}, $value);
// Extract text links for each protocol
foreach ((array)$protocols as $protocol) {
switch ($protocol) {
case 'http':
case 'https': $text = $this->linkifyHttp($protocol, $text, $links, $attr, $mode); break;
case 'mail': $text = $this->linkifyMail($text, $links, $attr); break;
default: $text = $this->linkifyOther($protocol, $text, $links, $attr, $mode); break;
}
}
// Insert all link
return preg_replace_callback('/<(\d+)>/', function ($match) use (&$links) {
return $links[$match[1] - 1];
}, $text);
}
}