--- /dev/null
+<?php
+/**
+ * @copyright Copyright (c) 2014 Carsten Brandt
+ * @license https://github.com/cebe/markdown/blob/master/LICENSE
+ * @link https://github.com/cebe/markdown#readme
+ */
+
+namespace cebe\markdown\block;
+
+/**
+ * Adds the list blocks
+ */
+trait ListTrait
+{
+ /**
+ * @var bool enable support `start` attribute of ordered lists. This means that lists
+ * will start with the number you actually type in markdown and not the HTML generated one.
+ * Defaults to `false` which means that numeration of all ordered lists(<ol>) starts with 1.
+ */
+ public $keepListStartNumber = false;
+
+ /**
+ * identify a line as the beginning of an ordered list.
+ */
+ protected function identifyOl($line)
+ {
+ return (($l = $line[0]) > '0' && $l <= '9' || $l === ' ') && preg_match('/^ {0,3}\d+\.[ \t]/', $line);
+ }
+
+ /**
+ * identify a line as the beginning of an unordered list.
+ */
+ protected function identifyUl($line)
+ {
+ $l = $line[0];
+ return ($l === '-' || $l === '+' || $l === '*') && (isset($line[1]) && (($l1 = $line[1]) === ' ' || $l1 === "\t")) ||
+ ($l === ' ' && preg_match('/^ {0,3}[\-\+\*][ \t]/', $line));
+ }
+
+ /**
+ * Consume lines for an ordered list
+ */
+ protected function consumeOl($lines, $current)
+ {
+ // consume until newline
+
+ $block = [
+ 'list',
+ 'list' => 'ol',
+ 'attr' => [],
+ 'items' => [],
+ ];
+ return $this->consumeList($lines, $current, $block, 'ol');
+ }
+
+ /**
+ * Consume lines for an unordered list
+ */
+ protected function consumeUl($lines, $current)
+ {
+ // consume until newline
+
+ $block = [
+ 'list',
+ 'list' => 'ul',
+ 'items' => [],
+ ];
+ return $this->consumeList($lines, $current, $block, 'ul');
+ }
+
+ private function consumeList($lines, $current, $block, $type)
+ {
+ $item = 0;
+ $indent = '';
+ $len = 0;
+ // track the indentation of list markers, if indented more than previous element
+ // a list marker is considered to be long to a lower level
+ $leadSpace = 3;
+ $marker = $type === 'ul' ? ltrim($lines[$current])[0] : '';
+ for ($i = $current, $count = count($lines); $i < $count; $i++) {
+ $line = $lines[$i];
+ // match list marker on the beginning of the line
+ if (preg_match($type == 'ol' ? '/^( {0,'.$leadSpace.'})(\d+)\.[ \t]+/' : '/^( {0,'.$leadSpace.'})\\'.$marker.'[ \t]+/', $line, $matches)) {
+ if (($len = substr_count($matches[0], "\t")) > 0) {
+ $indent = str_repeat("\t", $len);
+ $line = substr($line, strlen($matches[0]));
+ } else {
+ $len = strlen($matches[0]);
+ $indent = str_repeat(' ', $len);
+ $line = substr($line, $len);
+ }
+ if ($i === $current) {
+ $leadSpace = strlen($matches[1]) + 1;
+ }
+
+ if ($type == 'ol' && $this->keepListStartNumber) {
+ // attr `start` for ol
+ if (!isset($block['attr']['start']) && isset($matches[2])) {
+ $block['attr']['start'] = $matches[2];
+ }
+ }
+
+ $block['items'][++$item][] = $line;
+ } elseif (ltrim($line) === '') {
+ // next line after empty one is also a list or indented -> lazy list
+ if (isset($lines[$i + 1][0]) && (
+ $this->{'identify' . $type}($lines[$i + 1], $lines, $i + 1) && ($type !== 'ul' || ltrim($lines[$i + 1])[0] === $marker) ||
+ (strncmp($lines[$i + 1], $indent, $len) === 0 || !empty($lines[$i + 1]) && $lines[$i + 1][0] == "\t"))) {
+ $block['items'][$item][] = $line;
+ $block['lazyItems'][$item] = true;
+ } else {
+ break;
+ }
+ } else {
+ if ($line[0] === "\t") {
+ $line = substr($line, 1);
+ } elseif (strncmp($line, $indent, $len) === 0) {
+ $line = substr($line, $len);
+ }
+ $block['items'][$item][] = $line;
+ }
+ }
+
+ // make last item lazy if item before was lazy
+ if (isset($block['lazyItems'][$item - 1])) {
+ $block['lazyItems'][$item] = true;
+ }
+
+ foreach($block['items'] as $itemId => $itemLines) {
+ $content = [];
+ if (!isset($block['lazyItems'][$itemId])) {
+ $firstPar = [];
+ while (!empty($itemLines) && rtrim($itemLines[0]) !== '' && $this->detectLineType($itemLines, 0) === 'paragraph') {
+ $firstPar[] = array_shift($itemLines);
+ }
+ $content = $this->parseInline(implode("\n", $firstPar));
+ }
+ if (!empty($itemLines)) {
+ $content = array_merge($content, $this->parseBlocks($itemLines));
+ }
+ $block['items'][$itemId] = $content;
+ }
+
+ return [$block, $i];
+ }
+
+ /**
+ * Renders a list
+ */
+ protected function renderList($block)
+ {
+ $type = $block['list'];
+
+ if (!empty($block['attr'])) {
+ $output = "<$type " . $this->generateHtmlAttributes($block['attr']) . ">\n";
+ } else {
+ $output = "<$type>\n";
+ }
+
+ foreach ($block['items'] as $item => $itemLines) {
+ $output .= '<li>' . $this->renderAbsy($itemLines). "</li>\n";
+ }
+ return $output . "</$type>\n";
+ }
+
+
+ /**
+ * Return html attributes string from [attrName => attrValue] list
+ * @param array $attributes the attribute name-value pairs.
+ * @return string
+ */
+ private function generateHtmlAttributes($attributes)
+ {
+ foreach ($attributes as $name => $value) {
+ $attributes[$name] = "$name=\"$value\"";
+ }
+ return implode(' ', $attributes);
+ }
+
+ abstract protected function parseInline($text);
+ abstract protected function renderAbsy($absy);
+}
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