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phorge/src/infrastructure/markup/blockrule/PhutilRemarkupCodeBlockRule.php
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PhutilRemarkupCodeBlockRule.php
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<?php
final class PhutilRemarkupCodeBlockRule extends PhutilRemarkupBlockRule {
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('/^\s*(```)/', $lines[$cursor])) {
$match_ticks = true;
} else {
return $num_lines;
}
$num_lines++;
if ($match_ticks &&
preg_match('/^\s*(```)(.*)(```)\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) {
// Header/footer eventually useful to be nice with "flavored markdown".
// When it starts with ```stuff the header is 'stuff' (->language)
// When it ends with stuff``` the footer is 'stuff' (->garbage)
$header_line = null;
$footer_line = null;
$matches = null;
if (preg_match('/^\s*```(.*)/', $text, $matches)) {
if (isset($matches[1])) {
$header_line = $matches[1];
}
// If this is a ```-style block, trim off the backticks and any leading
// blank line.
$text = preg_replace('/^\s*```(\s*\n)?/', '', $text);
$text = preg_replace('/```\s*$/', '', $text);
}
$lines = explode("\n", $text);
// If we have a flavored header, it has sense to look for the footer.
if ($header_line !== null && $lines) {
$footer_line = $lines[last_key($lines)];
}
// Strip final empty lines
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));
$valid_options = null;
if ($custom) {
$valid_options = true;
foreach ($custom as $key => $value) {
if (!array_key_exists($key, $options)) {
$valid_options = false;
break;
}
}
if ($valid_options) {
array_shift($lines);
$options = $custom + $options;
}
}
// Parse flavored markdown strictly to don't eat legitimate Remarkup.
// Proceed only if we tried to parse options and we failed
// (no options also mean no language).
// For example this is not a valid option: ```php
// Proceed only if the footer exists and it is not: blabla```
// Accept only 2 lines or more. First line: header; then content.
if (
$valid_options === false &&
$header_line !== null &&
$footer_line === '' &&
count($lines) > 1
) {
if (self::isKnownLanguageCode($header_line)) {
array_shift($lines);
$options['lang'] = $header_line;
}
}
// 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", $out);
}
// The name is usually a sufficient source of information for file ext.
if (empty($options['lang']) && isset($options['name'])) {
$options['lang'] = $this->guessFilenameExtension($options['name']);
}
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'),
'text');
}
$options['lang'] = $lang;
}
$code_body = $this->highlightSource($text, $options);
$name_header = null;
$block_style = null;
if ($this->getEngine()->isHTMLMailMode()) {
$map = $this->getEngine()->getConfig('phutil.codeblock.style-map');
if ($map) {
$raw_body = id(new PhutilPygmentizeParser())
->setMap($map)
->parse((string)$code_body);
$code_body = phutil_safe_html($raw_body);
}
$style_rules = array(
'padding: 6px 12px;',
'font-size: 13px;',
'font-weight: bold;',
'display: inline-block;',
'border-top-left-radius: 3px;',
'border-top-right-radius: 3px;',
'color: rgba(0,0,0,.75);',
);
if ($options['counterexample']) {
$style_rules[] = 'background: #f7e6e6';
} else {
$style_rules[] = 'background: rgba(71, 87, 120, 0.08);';
}
$header_attributes = array(
'style' => implode(' ', $style_rules),
);
$block_style = 'margin: 12px 0;';
} else {
$header_attributes = array(
'class' => 'remarkup-code-header',
);
}
if ($options['name']) {
$name_header = phutil_tag(
'div',
$header_attributes,
$options['name']);
}
$class = 'remarkup-code-block';
if ($options['counterexample']) {
$class = 'remarkup-code-block code-block-counterexample';
}
$attributes = array(
'class' => $class,
'style' => $block_style,
'data-code-lang' => $options['lang'],
'data-sigil' => 'remarkup-code-block',
);
return phutil_tag(
'div',
$attributes,
array($name_header, $code_body));
}
private function highlightSource($text, array $options) {
if ($options['counterexample']) {
$aux_class = ' remarkup-counterexample';
} else {
$aux_class = null;
}
$aux_style = null;
if ($this->getEngine()->isHTMLMailMode()) {
$aux_style = array(
'font: 11px/15px "Menlo", "Consolas", "Monaco", monospace;',
'padding: 12px;',
'margin: 0;',
);
if ($options['counterexample']) {
$aux_style[] = 'background: #f7e6e6;';
} else {
$aux_style[] = 'background: rgba(71, 87, 120, 0.08);';
}
$aux_style = implode(' ', $aux_style);
}
if ($options['lines']) {
// Put a minimum size on this because the scrollbar is otherwise
// unusable.
$height = max(6, (int)$options['lines']);
$aux_style = $aux_style
.' '
.'max-height: '
.(2 * $height)
.'em; overflow: auto;';
}
$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)));
}
/**
* Check if a language code can be used in a generic flavored markdown.
* @param string $lang Language code
* @return bool
*/
private static function isKnownLanguageCode($lang) {
$languages = self::knownLanguageCodes();
return isset($languages[$lang]);
}
/**
* Get the available languages for a generic flavored markdown.
* @return array Languages as array keys. Ignore the value.
*/
private static function knownLanguageCodes() {
// This is a friendly subset from https://pygments.org/languages/
static $map = array(
'arduino' => 1,
'assembly' => 1,
'awk' => 1,
'bash' => 1,
'bat' => 1,
'c' => 1,
'cmake' => 1,
'cobol' => 1,
'cpp' => 1,
'css' => 1,
'csharp' => 1,
'dart' => 1,
'delphi' => 1,
'fortran' => 1,
'go' => 1,
'groovy' => 1,
'haskell' => 1,
'java' => 1,
'javascript' => 1,
'kotlin' => 1,
'lisp' => 1,
'lua' => 1,
'matlab' => 1,
'make' => 1,
'perl' => 1,
'php' => 1,
'powershell' => 1,
'python' => 1,
'r' => 1,
'ruby' => 1,
'rust' => 1,
'scala' => 1,
'sh' => 1,
'sql' => 1,
'typescript' => 1,
'vba' => 1,
);
return $map;
}
/**
* Get the extension from a filename.
* @param string $name "/path/to/something.name"
* @return null|string ".name"
*/
private function guessFilenameExtension($name) {
$name = basename($name);
$pos = strrpos($name, '.');
if ($pos !== false) {
return substr($name, $pos + 1);
}
return null;
}
}

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