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<?php
/**
* @copyright Copyright (c) 2014 Carsten Brandt
* @license https://github.com/cebe/markdown/blob/master/LICENSE
* @link https://github.com/cebe/markdown#readme
*/
namespace cebe\markdown\block;
/**
* Adds the 4 space indented code blocks
*/
trait CodeTrait
{
/**
* identify a line as the beginning of a code block.
*/
protected function identifyCode($line)
{
// indentation >= 4 or one tab is code
return ($l = $line[0]) === ' ' && $line[1] === ' ' && $line[2] === ' ' && $line[3] === ' ' || $l === "\t";
}
/**
* Consume lines for a code block element
*/
protected function consumeCode($lines, $current)
{
// consume until newline
$content = [];
for ($i = $current, $count = count($lines); $i < $count; $i++) {
$line = $lines[$i];
// a line is considered to belong to this code block as long as it is intended by 4 spaces or a tab
if (isset($line[0]) && ($line[0] === "\t" || strncmp($line, ' ', 4) === 0)) {
$line = $line[0] === "\t" ? substr($line, 1) : substr($line, 4);
$content[] = $line;
// but also if it is empty and the next line is intended by 4 spaces or a tab
} elseif (($line === '' || rtrim($line) === '') && isset($lines[$i + 1][0]) &&
($lines[$i + 1][0] === "\t" || strncmp($lines[$i + 1], ' ', 4) === 0)) {
if ($line !== '') {
$line = $line[0] === "\t" ? substr($line, 1) : substr($line, 4);
}
$content[] = $line;
} else {
break;
}
}
$block = [
'code',
'content' => implode("\n", $content),
];
return [$block, --$i];
}
/**
* Renders a code block
*/
protected function renderCode($block)
{
$class = isset($block['language']) ? ' class="language-' . $block['language'] . '"' : '';
return "<pre><code$class>" . htmlspecialchars($block['content'] . "\n", ENT_NOQUOTES | ENT_SUBSTITUTE, 'UTF-8') . "</code></pre>\n";
}
}