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PhutilDivinerSyntaxHighlighter.php
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Fri, Apr 11, 20:31

PhutilDivinerSyntaxHighlighter.php
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<?php
/**
* Simple syntax highlighter for the ".diviner" format, which is just Remarkup
* with a specific ruleset. This should also work alright for Remarkup.
*/
final class PhutilDivinerSyntaxHighlighter {
private $config = array();
private $replaceClass;
public function setConfig($key, $value) {
$this->config[$key] = $value;
return $this;
}
public function getHighlightFuture($source) {
$source = phutil_escape_html($source);
// This highlighter isn't perfect but tries to do an okay job at getting
// some of the basics at least. There's lots of room for improvement.
$blocks = explode("\n\n", $source);
foreach ($blocks as $key => $block) {
if (preg_match('/^[^ ](?! )/m', $block)) {
$blocks[$key] = $this->highlightBlock($block);
}
}
$source = implode("\n\n", $blocks);
$source = phutil_safe_html($source);
return new ImmediateFuture($source);
}
private function highlightBlock($source) {
// Highlight "@{class:...}" links to other documentation pages.
$source = $this->highlightPattern('/@{([\w@]+?):([^}]+?)}/', $source, 'nc');
// Highlight "@title", "@group", etc.
$source = $this->highlightPattern('/^@(\w+)/m', $source, 'k');
// Highlight bold, italic and monospace.
$source = $this->highlightPattern('@\\*\\*(.+?)\\*\\*@s', $source, 's');
$source = $this->highlightPattern('@(?<!:)//(.+?)//@s', $source, 's');
$source = $this->highlightPattern(
'@##([\s\S]+?)##|\B`(.+?)`\B@',
$source,
's');
// Highlight stuff that looks like headers.
$source = $this->highlightPattern('/^=(.*)$/m', $source, 'nv');
return $source;
}
private function highlightPattern($regexp, $source, $class) {
$this->replaceClass = $class;
$source = preg_replace_callback(
$regexp,
array($this, 'replacePattern'),
$source);
return $source;
}
public function replacePattern($matches) {
// NOTE: The goal here is to make sure a <span> never crosses a newline.
$content = $matches[0];
$content = explode("\n", $content);
foreach ($content as $key => $line) {
$content[$key] =
'<span class="'.$this->replaceClass.'">'.
$line.
'</span>';
}
return implode("\n", $content);
}
}

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