104 lines
2.3 KiB
PHP
104 lines
2.3 KiB
PHP
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<?php
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/**
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* @copyright Copyright 2014 Carsten Brandt, 2024 Daniel Pimley
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* @license https://github.com/xenocrat/chyrp-markdown/blob/master/LICENSE
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* @link https://github.com/xenocrat/chyrp-markdown#readme
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*/
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namespace xenocrat\markdown\block;
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/**
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* Adds indented code blocks.
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*/
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trait CodeTrait
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{
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/**
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* Identify a line as the beginning of a code block.
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*/
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protected function identifyCode($line): bool
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{
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// Indentation >= 4 or one tab is code.
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return $line[0] === "\t" || strncmp($line, ' ', 4) === 0;
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}
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/**
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* Consume lines for a code block element.
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*/
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protected function consumeCode($lines, $current): array
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{
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$content = [];
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// Consume until end of markers...
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for ($i = $current, $count = count($lines); $i < $count; $i++) {
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$line = $lines[$i];
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if (isset($line[0]) && $line[0] === "\t") {
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// A line belongs to this code block if indented by a tab.
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$line = substr($line, 1);
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$content[] = $line;
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} elseif (str_starts_with($line, ' ')) {
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// A line belongs to this code block if indented by 4 spaces.
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$line = substr($line, 4);
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$content[] = $line;
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} elseif (
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($line === '' || ltrim($line) === '')
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&& isset($lines[$i + 1])
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) {
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// ...Or if blank and the next is also blank
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// or the next is indented by 4 spaces or a tab.
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$next = $lines[$i + 1];
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if (
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$next === ''
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|| ltrim($next) === ''
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|| $next[0] === "\t"
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|| str_starts_with($next, ' ')
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) {
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$line = '';
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$content[] = $line;
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} else {
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break;
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}
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} else {
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break;
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}
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}
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// Remove leading blank lines.
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while (
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count($content) > 1
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&& ltrim(reset($content)) === ''
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) {
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array_shift($content);
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}
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// Remove trailing blank lines.
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while (
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count($content) > 1
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&& ltrim(end($content)) === ''
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) {
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array_pop($content);
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}
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$block = [
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'code',
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'content' => implode("\n", $content),
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];
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return [$block, --$i];
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}
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/**
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* Renders a code block.
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*/
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protected function renderCode($block): string
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{
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$class = isset($block['language']) ?
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' class="language-' . $block['language'] . '"' : '';
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return "<pre><code$class>"
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. $this->escapeHtmlEntities(
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$block['content'],
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ENT_COMPAT | ENT_SUBSTITUTE
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)
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. ($block['content'] === '' ? '' : "\n" )
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. "</code></pre>\n";
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}
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abstract protected function escapeHtmlEntities($text, $flags = 0);
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}
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