<?php
/**
* @package s9e\TextFormatter
* @copyright Copyright (c) 2010-2021 The s9e authors
* @license http://www.opensource.org/licenses/mit-license.php The MIT License
*/
namespace s9e\TextFormatter\Plugins\Litedown\Parser\Passes;
use s9e\TextFormatter\Plugins\Litedown\Parser\LinkAttributesSetter;
class Images extends AbstractPass
{
use LinkAttributesSetter;
/**
* {@inheritdoc}
*/
public function parse()
{
$pos = $this->text->indexOf(' !== false)
{
$this->parseInlineImages();
}
if ($this->text->hasReferences)
{
$this->parseReferenceImages();
}
}
/**
* Add an image tag for given text span
*
* @param integer $startPos Start tag position
* @param integer $endPos End tag position
* @param integer $endLen End tag length
* @param string $linkInfo URL optionally followed by space and a title
* @param string $alt Value for the alt attribute
* @return void
*/
protected function addImageTag($startPos, $endPos, $endLen, $linkInfo, $alt)
{
$tag = $this->parser->addTagPair('IMG', $startPos, 2, $endPos, $endLen);
$this->setLinkAttributes($tag, $linkInfo, 'src');
$tag->setAttribute('alt', $this->text->decode($alt));
// Overwrite the markup
$this->text->overwrite($startPos, $endPos + $endLen - $startPos);
}
/**
* Parse inline images markup
*
* @return void
*/
protected function parseInlineImages()
{
preg_match_all(
'/!\\[(?:[^\\x17[\\]]|\\[[^\\x17[\\]]*\\])*\\]\\(( *(?:[^\\x17\\s()]|\\([^\\x17\\s()]*\\))*(?=[ )]) *(?:"[^\\x17]*?"|\'[^\\x17]*?\'|\\([^\\x17)]*\\))? *)\\)/',
$this->text,
$matches,
PREG_OFFSET_CAPTURE | PREG_SET_ORDER
);
foreach ($matches as $m)
{
$linkInfo = $m[1][0];
$startPos = $m[0][1];
$endLen = 3 + strlen($linkInfo);
$endPos = $startPos + strlen($m[0][0]) - $endLen;
$alt = substr($m[0][0], 2, strlen($m[0][0]) - $endLen - 2);
$this->addImageTag($startPos, $endPos, $endLen, $linkInfo, $alt);
}
}
/**
* Parse reference images markup
*
* @return void
*/
protected function parseReferenceImages()
{
preg_match_all(
'/!\\[((?:[^\\x17[\\]]|\\[[^\\x17[\\]]*\\])*)\\](?: ?\\[([^\\x17[\\]]+)\\])?/',
$this->text,
$matches,
PREG_OFFSET_CAPTURE | PREG_SET_ORDER
);
foreach ($matches as $m)
{
$startPos = $m[0][1];
$endPos = $startPos + 2 + strlen($m[1][0]);
$endLen = 1;
$alt = $m[1][0];
$id = $alt;
if (isset($m[2][0], $this->text->linkReferences[$m[2][0]]))
{
$endLen = strlen($m[0][0]) - strlen($alt) - 2;
$id = $m[2][0];
}
elseif (!isset($this->text->linkReferences[$id]))
{
continue;
}
$this->addImageTag($startPos, $endPos, $endLen, $this->text->linkReferences[$id], $alt);
}
}
}