implement pages

1 files changed, 75 insertions, 0 deletions

diff --git a/Digitigrade/Page.php b/Digitigrade/Page.php
new file mode 100644
index 0000000..963a27d
--- /dev/null
+++ b/Digitigrade/Page.php
@@ -0,0 +1,75 @@
+<?php
+namespace Digitigrade;
+
+use Digitigrade\FormattingProvider\CommonMark;
+use Digitigrade\FormattingProvider\SanitisedHtml;
+use Digitigrade\Model\Note;
+
+class Page implements \JsonSerializable {
+    public string $title;
+    public array $content;
+    /** @var PageLink[] */
+    public array $links;
+
+    public static function create(string $title, array $content) {
+        $page = new self();
+        $page->title = $title;
+        $page->content = $content;
+        $page->links = [];
+        return $page;
+    }
+
+    /**
+     * Gets the best available formatted content (or plain if there aren't any)
+     * and converts it to sanitised HTML
+     * @return string HTML that is hopefully safe to include directly
+     */
+    public function getBestContentAsHtml(): string {
+        if (isset($this->content['text/html'])) {
+            return SanitisedHtml::getInstance()->renderToHtml($this->insertLinks($this->content['text/html'], 'text/html'));
+        } elseif (isset($this->content['text/markdown'])) {
+            return CommonMark::getInstance()->renderToHtml($this->insertLinks($this->content['text/markdown'], 'text/markdown'));
+        }
+        return htmlspecialchars($this->insertLinks($this->content['text/plain'] ?? __('placeholder'), 'text/plain'));
+    }
+
+    private function insertLinks(string $originalContent, string $mediaType): string {
+        $result = $originalContent;
+        $offset = 0;
+
+        foreach ($this->links as $link) {
+            $range = $link->range[$mediaType] ?? null;
+            $targetNote = Note::findByUri($link->target);
+            if ($range == null || $targetNote == null)
+                continue;
+            $target = path_to_uri(htmlspecialchars($targetNote->getLocalUiHref(true)));
+            $before = mb_substr($result, 0, $range->start, 'utf-8');
+            $label = mb_substr($result, $range->start, $range->end - $range->start, 'utf-8');
+            $after = mb_substr($result, $range->end, null, 'utf-8');
+            $startTag = match ($mediaType) {
+                'text/html' => '<a href="' . htmlspecialchars($target) . '">',
+                'text/markdown' => '[',
+                'text/plain' => '',
+                default => ''
+            };
+            $endTag = match ($mediaType) {
+                'text/html' => '</a>',
+                'text/markdown' => '](' . htmlspecialchars($target) . ')',
+                'text/plain' => " ($target)",
+                default => ''
+            };
+            $result = $before . $startTag . $label . $endTag . $after;
+            $offset += strlen($startTag) + strlen($endTag);
+        }
+
+        return $result;
+    }
+
+    public function jsonSerialize(): array {
+        return [
+            'title' => $this->title,
+            'content' => $this->content,
+            'links' => $this->links
+        ];
+    }
+}
\ No newline at end of file