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PhutilRemarkupEngineRemarkupCodeBlockRule.php
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Sun, Dec 29, 14:33

PhutilRemarkupEngineRemarkupCodeBlockRule.php
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<?php
/**
* @group markup
*/
final class PhutilRemarkupEngineRemarkupCodeBlockRule
extends PhutilRemarkupEngineBlockRule {
public function getMatchingLineCount(array $lines, $cursor) {
$num_lines = 0;
$match_ticks = null;
if (preg_match("/^(\s{2,}).+/", $lines[$cursor])) {
$match_ticks = false;
} else if (preg_match("/^(```)/", $lines[$cursor])) {
$match_ticks = true;
} else {
return $num_lines;
}
$num_lines++;
if ($match_ticks && preg_match("/^(```)(.*)(```)\s*$/", $lines[$cursor])) {
return $num_lines;
}
$cursor++;
while (isset($lines[$cursor])) {
if ($match_ticks) {
if (preg_match('/```\s*$/', $lines[$cursor])) {
$num_lines++;
break;
}
$num_lines++;
} else {
if (strlen(trim($lines[$cursor]))) {
if (!preg_match('/^\s{2,}/', $lines[$cursor])) {
break;
}
}
$num_lines++;
}
$cursor++;
}
return $num_lines;
}
public function markupText($text, $children) {
if (preg_match('/^```/', $text)) {
// If this is a ```-style block, trim off the backticks and any leading
// blank line.
$text = preg_replace('/^```(\s*\n)?/', '', $text);
$text = preg_replace('/```\s*$/', '', $text);
}
$lines = explode("\n", $text);
while ($lines && !strlen(last($lines))) {
unset($lines[last_key($lines)]);
}
$options = array(
'counterexample' => false,
'lang' => null,
'name' => null,
'lines' => null,
);
$parser = new PhutilSimpleOptions();
$custom = $parser->parse(head($lines));
if ($custom) {
$valid = true;
foreach ($custom as $key => $value) {
if (!array_key_exists($key, $options)) {
$valid = false;
break;
}
}
if ($valid) {
array_shift($lines);
$options = $custom + $options;
}
}
// Normalize the text back to a 0-level indent.
$min_indent = 80;
foreach ($lines as $line) {
for ($ii = 0; $ii < strlen($line); $ii++) {
if ($line[$ii] != ' ') {
$min_indent = min($ii, $min_indent);
break;
}
}
}
$text = implode("\n", $lines);
if ($min_indent) {
$indent_string = str_repeat(' ', $min_indent);
$text = preg_replace('/^'.$indent_string.'/m', '', $text);
}
if ($this->getEngine()->isTextMode()) {
$out = array();
$header = array();
if ($options['counterexample']) {
$header[] = 'counterexample';
}
if ($options['name'] != '') {
$header[] = 'name='.$options['name'];
}
if ($header) {
$out[] = implode(', ', $header);
}
$text = preg_replace('/^/m', ' ', $text);
$out[] = $text;
return implode("\n", $out);
}
if (empty($options['lang'])) {
// If the user hasn't specified "lang=..." explicitly, try to guess the
// language. If we fail, fall back to configured defaults.
$lang = PhutilLanguageGuesser::guessLanguage($text);
if (!$lang) {
$lang = nonempty(
$this->getEngine()->getConfig('phutil.codeblock.language-default'),
'php');
}
$options['lang'] = $lang;
}
$code_body = $this->highlightSource($text, $options);
$name_header = null;
if ($options['name']) {
$name_header = phutil_tag(
'div',
array(
'class' => 'remarkup-code-header',
),
$options['name']);
}
return phutil_tag(
'div',
array(
'class' => 'remarkup-code-block',
'data-code-lang' => $options['lang'],
'data-sigil' => 'remarkup-code-block',
),
array($name_header, $code_body));
}
private function highlightSource($text, array $options) {
if ($options['counterexample']) {
$aux_class = ' remarkup-counterexample';
} else {
$aux_class = null;
}
$aux_style = null;
if ($options['lines']) {
// Put a minimum size on this because the scrollbar is otherwise
// unusable.
$height = max(6, (int)$options['lines']);
$aux_style = 'max-height: '.(2 * $height).'em;';
}
$engine = $this->getEngine()->getConfig('syntax-highlighter.engine');
if (!$engine) {
$engine = 'PhutilDefaultSyntaxHighlighterEngine';
}
$engine = newv($engine, array());
$engine->setConfig(
'pygments.enabled',
$this->getEngine()->getConfig('pygments.enabled'));
return phutil_tag(
'pre',
array(
'class' => 'remarkup-code'.$aux_class,
'style' => $aux_style,
),
PhutilSafeHTML::applyFunction(
'rtrim',
$engine->highlightSource($options['lang'], $text)));
}
}

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