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vendor/cebe/markdown/MarkdownExtra.php
vendored
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250
vendor/cebe/markdown/MarkdownExtra.php
vendored
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<?php
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namespace cebe\markdown;
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use cebe\markdown\block\TableTrait;
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// work around https://github.com/facebook/hhvm/issues/1120
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defined('ENT_HTML401') || define('ENT_HTML401', 0);
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/**
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* Markdown parser for the [markdown extra](http://michelf.ca/projects/php-markdown/extra/) flavor.
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*
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* @author Carsten Brandt <mail@cebe.cc>
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* @license https://github.com/cebe/markdown/blob/master/LICENSE
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* @link https://github.com/cebe/markdown#readme
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*/
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class MarkdownExtra extends Markdown
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{
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// include block element parsing using traits
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use block\TableTrait;
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use block\FencedCodeTrait;
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// include inline element parsing using traits
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// TODO
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/**
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* @var bool whether special attributes on code blocks should be applied on the `<pre>` element.
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* The default behavior is to put them on the `<code>` element.
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*/
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public $codeAttributesOnPre = false;
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/**
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* @inheritDoc
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*/
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protected $escapeCharacters = [
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// from Markdown
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'\\', // backslash
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'`', // backtick
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'*', // asterisk
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'_', // underscore
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'{', '}', // curly braces
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'[', ']', // square brackets
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'(', ')', // parentheses
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'#', // hash mark
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'+', // plus sign
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'-', // minus sign (hyphen)
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'.', // dot
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'!', // exclamation mark
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'<', '>',
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// added by MarkdownExtra
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':', // colon
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'|', // pipe
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];
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private $_specialAttributesRegex = '\{(([#\.][A-z0-9-_]+\s*)+)\}';
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// TODO allow HTML intended 3 spaces
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// TODO add markdown inside HTML blocks
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// TODO implement definition lists
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// TODO implement footnotes
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// TODO implement Abbreviations
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// block parsing
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protected function identifyReference($line)
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{
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return ($line[0] === ' ' || $line[0] === '[') && preg_match('/^ {0,3}\[(.+?)\]:\s*([^\s]+?)(?:\s+[\'"](.+?)[\'"])?\s*('.$this->_specialAttributesRegex.')?\s*$/', $line);
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}
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/**
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* Consume link references
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*/
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protected function consumeReference($lines, $current)
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{
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while (isset($lines[$current]) && preg_match('/^ {0,3}\[(.+?)\]:\s*(.+?)(?:\s+[\(\'"](.+?)[\)\'"])?\s*('.$this->_specialAttributesRegex.')?\s*$/', $lines[$current], $matches)) {
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$label = strtolower($matches[1]);
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$this->references[$label] = [
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'url' => $this->replaceEscape($matches[2]),
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];
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if (isset($matches[3])) {
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$this->references[$label]['title'] = $matches[3];
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} else {
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// title may be on the next line
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if (isset($lines[$current + 1]) && preg_match('/^\s+[\(\'"](.+?)[\)\'"]\s*$/', $lines[$current + 1], $matches)) {
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$this->references[$label]['title'] = $matches[1];
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$current++;
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}
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}
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if (isset($matches[5])) {
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$this->references[$label]['attributes'] = $matches[5];
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}
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$current++;
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}
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return [false, --$current];
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}
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/**
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* Consume lines for a fenced code block
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*/
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protected function consumeFencedCode($lines, $current)
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{
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// consume until ```
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$block = [
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'code',
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];
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$line = rtrim($lines[$current]);
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if (($pos = strrpos($line, '`')) === false) {
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$pos = strrpos($line, '~');
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}
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$fence = substr($line, 0, $pos + 1);
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$block['attributes'] = substr($line, $pos);
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$content = [];
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for($i = $current + 1, $count = count($lines); $i < $count; $i++) {
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if (rtrim($line = $lines[$i]) !== $fence) {
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$content[] = $line;
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} else {
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break;
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}
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}
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$block['content'] = implode("\n", $content);
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return [$block, $i];
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}
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protected function renderCode($block)
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{
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$attributes = $this->renderAttributes($block);
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return ($this->codeAttributesOnPre ? "<pre$attributes><code>" : "<pre><code$attributes>")
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. htmlspecialchars($block['content'] . "\n", ENT_NOQUOTES | ENT_SUBSTITUTE, 'UTF-8')
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. "</code></pre>\n";
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}
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/**
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* Renders a headline
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*/
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protected function renderHeadline($block)
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{
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foreach($block['content'] as $i => $element) {
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if ($element[0] === 'specialAttributes') {
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unset($block['content'][$i]);
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$block['attributes'] = $element[1];
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}
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}
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$tag = 'h' . $block['level'];
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$attributes = $this->renderAttributes($block);
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return "<$tag$attributes>" . rtrim($this->renderAbsy($block['content']), "# \t") . "</$tag>\n";
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}
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protected function renderAttributes($block)
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{
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$html = [];
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if (isset($block['attributes'])) {
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$attributes = preg_split('/\s+/', $block['attributes'], -1, PREG_SPLIT_NO_EMPTY);
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foreach($attributes as $attribute) {
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if ($attribute[0] === '#') {
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$html['id'] = substr($attribute, 1);
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} else {
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$html['class'][] = substr($attribute, 1);
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}
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}
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}
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$result = '';
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foreach($html as $attr => $value) {
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if (is_array($value)) {
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$value = trim(implode(' ', $value));
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}
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if (!empty($value)) {
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$result .= " $attr=\"$value\"";
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}
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}
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return $result;
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}
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// inline parsing
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/**
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* @marker {
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*/
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protected function parseSpecialAttributes($text)
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{
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if (preg_match("~$this->_specialAttributesRegex~", $text, $matches)) {
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return [['specialAttributes', $matches[1]], strlen($matches[0])];
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}
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return [['text', '{'], 1];
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}
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protected function renderSpecialAttributes($block)
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{
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return '{' . $block[1] . '}';
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}
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protected function parseInline($text)
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{
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$elements = parent::parseInline($text);
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// merge special attribute elements to links and images as they are not part of the final absy later
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$relatedElement = null;
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foreach($elements as $i => $element) {
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if ($element[0] === 'link' || $element[0] === 'image') {
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$relatedElement = $i;
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} elseif ($element[0] === 'specialAttributes') {
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if ($relatedElement !== null) {
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$elements[$relatedElement]['attributes'] = $element[1];
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unset($elements[$i]);
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}
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$relatedElement = null;
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} else {
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$relatedElement = null;
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}
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}
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return $elements;
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}
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protected function renderLink($block)
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{
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if (isset($block['refkey'])) {
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if (($ref = $this->lookupReference($block['refkey'])) !== false) {
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$block = array_merge($block, $ref);
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} else {
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return $block['orig'];
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}
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}
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$attributes = $this->renderAttributes($block);
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return '<a href="' . htmlspecialchars($block['url'], ENT_COMPAT | ENT_HTML401, 'UTF-8') . '"'
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. (empty($block['title']) ? '' : ' title="' . htmlspecialchars($block['title'], ENT_COMPAT | ENT_HTML401 | ENT_SUBSTITUTE, 'UTF-8') . '"')
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. $attributes . '>' . $this->renderAbsy($block['text']) . '</a>';
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}
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protected function renderImage($block)
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{
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if (isset($block['refkey'])) {
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if (($ref = $this->lookupReference($block['refkey'])) !== false) {
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$block = array_merge($block, $ref);
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} else {
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return $block['orig'];
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}
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}
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$attributes = $this->renderAttributes($block);
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return '<img src="' . htmlspecialchars($block['url'], ENT_COMPAT | ENT_HTML401, 'UTF-8') . '"'
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. ' alt="' . htmlspecialchars($block['text'], ENT_COMPAT | ENT_HTML401 | ENT_SUBSTITUTE, 'UTF-8') . '"'
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. (empty($block['title']) ? '' : ' title="' . htmlspecialchars($block['title'], ENT_COMPAT | ENT_HTML401 | ENT_SUBSTITUTE, 'UTF-8') . '"')
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. $attributes . ($this->html5 ? '>' : ' />');
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}
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}
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