Differential D20825 Diff 49655 src/infrastructure/markup/markuprule/PhutilRemarkupAnchorRule.php

Changeset View

Standalone View

				<?php

				final class PhutilRemarkupAnchorRule extends PhutilRemarkupRule {

				public function getPriority() {
				return 200.0;
				}

				public function apply($text) {
				return preg_replace_callback(
				'/{anchor\s+#([^\s}]+)}/s',
				array($this, 'markupAnchor'),
				$text);
				}

				protected function markupAnchor(array $matches) {
				$engine = $this->getEngine();

				if ($engine->isTextMode()) {
				return null;
				}

				if ($engine->isHTMLMailMode()) {
				return null;
				}

				if ($engine->isAnchorMode()) {
				return null;
				}

				if (!$this->isFlatText($matches[0])) {
				return $matches[0];
				}

				if (!self::isValidAnchorName($matches[1])) {
				return $matches[0];
				}

				$tag_view = phutil_tag(
				'a',
				array(
				'name' => $matches[1],
				),
				'');

				return $this->getEngine()->storeText($tag_view);
				}

				public static function isValidAnchorName($anchor_name) {
				$normal_anchor = self::normalizeAnchor($anchor_name);

				if ($normal_anchor === $anchor_name) {
				return true;
				}

				return false;
				}

				public static function normalizeAnchor($anchor) {
				// Replace all latin characters which are not "a-z" or "0-9" with "-".
				// Preserve other characters, since non-latin letters and emoji work
				// fine in anchors.
				$anchor = preg_replace('/[\x00-\x2F\x3A-\x60\x7B-\x7F]+/', '-', $anchor);
				$anchor = trim($anchor, '-');

				return $anchor;
				}

				}