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PhutilRemarkupHorizontalRuleBlockRule.php
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			<?php

			final class PhutilRemarkupHorizontalRuleBlockRule
			extends PhutilRemarkupBlockRule {

			/**
			* This rule executes at priority `300`, so it can preempt the list block
			* rule and claim blocks which begin `---`.
			*/
			public function getPriority() {
			return 300;
			}

			public function getMatchingLineCount(array $lines, $cursor) {
			$num_lines = 0;
			$pattern = '/^\s(?:_{3,}\|\\s?\\s?\(\s\|\)\|\-\s?\-\s?\-(\s\|\-)*)$/';
			if (preg_match($pattern, rtrim($lines[$cursor], "\n\r"))) {
			$num_lines++;
			$cursor++;
			while (isset($lines[$cursor]) && !strlen(trim($lines[$cursor]))) {
			$num_lines++;
			$cursor++;
			}
			}

			return $num_lines;
			}

			public function markupText($text, $children) {
			if ($this->getEngine()->isTextMode()) {
			return rtrim($text);
			}

			return phutil_tag('hr', array('class' => 'remarkup-hr'));
			}

			}