127 lines
2.7 KiB
PHP
127 lines
2.7 KiB
PHP
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<?php
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/**
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* @copyright Copyright 2023 Daniel Pimley
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* @license https://github.com/xenocrat/chyrp-markdown/blob/master/LICENSE
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* @link https://github.com/xenocrat/chyrp-markdown#readme
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*/
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namespace xenocrat\markdown\block;
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/**
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* Adds figure/figcaption blocks.
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*/
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trait FigureTrait
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{
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/**
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* Identify a line as the beginning of a figure.
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*/
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protected function identifyFigure($line): bool
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{
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if (
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$line[0] === ' '
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&& strspn($line, ' ') < 4
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) {
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// Trim up to three spaces.
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$line = ltrim($line, ' ');
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}
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return $line[0] === ':';
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}
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/**
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* Consume lines for a figure.
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*/
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protected function consumeFigure($lines, $current): array
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{
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$content = [];
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$caption = [];
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// Consume until end of markers...
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for ($i = $current, $count = count($lines); $i < $count; $i++) {
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$line = $lines[$i];
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if (
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isset($line[0])
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&& $line[0] === ' '
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&& strspn($line, ' ') < 4
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) {
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// Trim up to three spaces.
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$line = ltrim($line, ' ');
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}
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if (ltrim($line) !== '') {
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if (str_starts_with($line, ':: ')) {
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$caption[$i] = substr($line, 3);
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continue;
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} elseif (str_starts_with($line, '::')) {
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$caption[$i] = substr($line, 2);
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continue;
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} elseif (str_starts_with($line, ': ')) {
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$content[] = substr($line, 2);
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} elseif (str_starts_with($line, ':')) {
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$content[] = substr($line, 1);
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} else {
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--$i;
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break;
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}
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} else {
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break;
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}
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}
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// Decide caption placement and remove invalid lines.
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if (isset($caption[$current])) {
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$endcap = false;
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for ($x = $current; $x < $i; $x++) {
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if ($x !== $current && !isset($caption[$x - 1])) {
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unset($caption[$x]);
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}
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}
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} elseif (isset($caption[$i - 1])) {
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$endcap = true;
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for ($x = $i - 1; $x >= $current; $x--) {
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if ($x !== $i - 1 && !isset($caption[$x + 1])) {
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unset($caption[$x]);
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}
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}
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} else {
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$endcap = null;
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$caption = [];
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}
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$block = [
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'figure',
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'endcap' => $endcap,
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'content' => $this->parseBlocks($content),
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'caption' => $this->parseBlocks(array_values($caption)),
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];
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return [$block, $i];
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}
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/**
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* Renders a figure.
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*/
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protected function renderFigure($block): string
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{
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$caption = $block['endcap'] === null ?
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'' :
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"<figcaption>\n"
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. $this->renderAbsy($block['caption'])
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. "</figcaption>\n" ;
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if ($block['endcap'] === false) {
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$figure = "<figure>\n"
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. $caption . $this->renderAbsy($block['content'])
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. "</figure>\n";
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} else {
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$figure = "<figure>\n"
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. $this->renderAbsy($block['content'])
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. $caption
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. "</figure>\n";
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}
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return $figure;
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}
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abstract protected function parseBlocks($lines);
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abstract protected function renderAbsy($absy);
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}
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