PhutilRemarkupAnchorRule.php
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PhutilRemarkupAnchorRule.php
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	<?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;
	}

	}