aleph1.co.uk Git - yaffs-website/blob - vendor/cebe/markdown/block/HeadlineTrait.php

   1 <?php
   2 /**
   3  * @copyright Copyright (c) 2014 Carsten Brandt
   4  * @license https://github.com/cebe/markdown/blob/master/LICENSE
   5  * @link https://github.com/cebe/markdown#readme
   6  */
   7
   8 namespace cebe\markdown\block;
   9
  10 /**
  11  * Adds the headline blocks
  12  */
  13 trait HeadlineTrait
  14 {
  15         /**
  16          * identify a line as a headline
  17          */
  18         protected function identifyHeadline($line, $lines, $current)
  19         {
  20                 return (
  21                         // heading with #
  22                         $line[0] === '#'
  23                         ||
  24                         // underlined headline
  25                         !empty($lines[$current + 1]) &&
  26                         (($l = $lines[$current + 1][0]) === '=' || $l === '-') &&
  27                         preg_match('/^(\-+|=+)\s*$/', $lines[$current + 1])
  28                 );
  29         }
  30
  31         /**
  32          * Consume lines for a headline
  33          */
  34         protected function consumeHeadline($lines, $current)
  35         {
  36                 if ($lines[$current][0] === '#') {
  37                         // ATX headline
  38                         $level = 1;
  39                         while (isset($lines[$current][$level]) && $lines[$current][$level] === '#' && $level < 6) {
  40                                 $level++;
  41                         }
  42                         $block = [
  43                                 'headline',
  44                                 'content' => $this->parseInline(trim($lines[$current], "# \t")),
  45                                 'level' => $level,
  46                         ];
  47                         return [$block, $current];
  48                 } else {
  49                         // underlined headline
  50                         $block = [
  51                                 'headline',
  52                                 'content' => $this->parseInline($lines[$current]),
  53                                 'level' => $lines[$current + 1][0] === '=' ? 1 : 2,
  54                         ];
  55                         return [$block, $current + 1];
  56                 }
  57         }
  58
  59         /**
  60          * Renders a headline
  61          */
  62         protected function renderHeadline($block)
  63         {
  64                 $tag = 'h' . $block['level'];
  65                 return "<$tag>" . $this->renderAbsy($block['content']) . "</$tag>\n";
  66         }
  67
  68         abstract protected function parseInline($text);
  69         abstract protected function renderAbsy($absy);
  70 }