111 lines
3.2 KiB
PHP
111 lines
3.2 KiB
PHP
<?php
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declare(strict_types=1);
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namespace LogseqGem;
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use League\CommonMark\Node\Inline\Text;
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use League\CommonMark\Extension\CommonMark\Node\Inline\Link;
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use League\CommonMark\Extension\CommonMark\Node\Block\ListBlock;
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use League\CommonMark\Extension\CommonMark\Node\Block\ListItem;
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class ArticleParser extends Parser {
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private ?array $properties;
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public function convert(): string {
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$gemtext = [];
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$this->properties = [];
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$in_frontmatter = true;
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$node = null; //current node
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$last_node = null; //updated every time
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$previous_node = null; // we only update this for significant nodes
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$block_level = 0;
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$list_item = 0;
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$walker = $this->document->walker();
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while ($event = $walker->next()) {
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$entering = $event->isEntering();
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$last_node = $node;
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$node = $event->getNode();
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// treat empty node as a newline
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if ($node instanceof ListItem && $last_node === $node && !$entering) {
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$gemtext[] = '';
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continue;
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}
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if (!$entering) {
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if ($node instanceof ListBlock) {
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$block_level -= 1;
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$list_item = 0;
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}
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continue;
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}
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if ($node instanceof ListBlock) {
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$block_level += 1;
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$in_frontmatter = false;
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continue;
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}
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if ($node instanceof Text) {
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$text = $node->getLiteral();
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if ($in_frontmatter) {
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if (preg_match('/^([A-Za-z-]+):: (.*)/', $text, $matches)) {
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$this->properties[$matches[1]] = $matches[2];
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continue;
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} else {
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$in_frontmatter = false;
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}
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}
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if ($block_level > 1) {
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$list_item += 1;
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$leader = $list_item === 1 ? "\n" : "";
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$gemtext[] = $leader . '* ' . $text;
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} else {
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$leader = $previous_node ? "\n" : "";
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$gemtext[] = $leader . $text;
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}
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$previous_node = $node;
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continue;
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}
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if ($node instanceof Link) {
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$label = $walker->next()->getNode();
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if (!$label instanceof Text) {
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throw new \Exception('Expected next node in Link to be Text, got ' . get_class($label));
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}
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$leader = ($previous_node && !$previous_node instanceof Link) ? "\n" : "";
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$gemtext[] = $leader . sprintf("=> %s %s", $node->getUrl(), $label->getLiteral());
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$previous_node = $node;
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continue;
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}
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}
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return implode("\n", $gemtext);
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}
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public function getProperties(): array {
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if (is_null($this->properties)) {
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throw new \Exception("Cannot get properties before converting a document");
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}
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return $this->properties;
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}
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public function isPublished(): bool {
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return (($this->getProperties()['status'] ?? '') === 'published');
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}
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}
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