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<?php
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/**
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* AutoP
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*
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* @copyright Copyright (c) 2012 Typecho Team. (http://typecho.org)
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* @author Joyqi <magike.net@gmail.com>
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* @license GNU General Public License 2.0
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*/
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class AutoP
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{
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// 作为段落的标签
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const BLOCK = 'p|pre|div|blockquote|form|ul|ol|dd|table|ins|h1|h2|h3|h4|h5|h6';
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/**
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* 唯一id
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*
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* @access private
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* @var integer
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*/
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private $_uniqueId = 0;
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/**
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* 存储的段落
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*
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* @access private
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* @var array
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*/
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private $_blocks = array();
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/**
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* 生成唯一的id, 为了速度考虑最多支持1万个tag的处理
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*
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* @access private
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* @return string
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*/
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private function makeUniqueId()
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{
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return ':' . str_pad($this->_uniqueId ++, 4, '0', STR_PAD_LEFT);
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}
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/**
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* 用段落方法处理换行
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*
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* @access private
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* @param string $text
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* @return string
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*/
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private function cutByBlock($text)
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{
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$space = "( | )";
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$text = str_replace("\r\n", "\n", trim($text));
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$text = preg_replace("/{$space}*\n{$space}*/is", "\n", $text);
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$text = preg_replace("/\s*<p:([0-9]{4})\/>\s*/is", "</p><p:\\1/><p>", $text);
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$text = preg_replace("/\n{2,}/", "</p><p>", $text);
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$text = nl2br($text);
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$text = preg_replace("/(<p>)?\s*<p:([0-9]{4})\/>\s*(<\/p>)?/is", "<p:\\2/>", $text);
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$text = preg_replace("/<p>{$space}*<\/p>/is", '', $text);
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$text = preg_replace("/\s*<p>\s*$/is", '', $text);
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$text = preg_replace("/^\s*<\/p>\s*/is", '', $text);
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return $text;
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}
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/**
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* 修复段落开头和结尾
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*
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* @access private
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* @param string $text
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* @return string
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*/
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private function fixPragraph($text)
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{
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$text = trim($text);
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if (!preg_match("/^<(" . self::BLOCK . ")(\s|>)/i", $text)) {
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$text = '<p>' . $text;
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}
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if (!preg_match("/<\/(" . self::BLOCK . ")>$/i", $text)) {
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$text = $text . '</p>';
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}
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return $text;
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}
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/**
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* 替换段落的回调函数
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*
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* @access public
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* @param array $matches 匹配值
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* @return string
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*/
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public function replaceBlockCallback($matches)
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{
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$tagMatch = '|' . $matches[1] . '|';
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$text = $matches[4];
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switch (true) {
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/** 用br处理换行 */
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case false !== strpos('|li|dd|dt|td|p|a|span|cite|strong|sup|sub|small|del|u|i|b|ins|h1|h2|h3|h4|h5|h6|', $tagMatch):
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$text = nl2br(trim($text));
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break;
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/** 用段落处理换行 */
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case false !== strpos('|div|blockquote|form|', $tagMatch):
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$text = $this->cutByBlock($text);
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if (false !== strpos($text, '</p><p>')) {
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$text = $this->fixPragraph($text);
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}
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break;
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default:
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break;
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}
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/** 没有段落能力的标签 */
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if (false !== strpos('|a|span|font|code|cite|strong|sup|sub|small|del|u|i|b|', $tagMatch)) {
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$key = '<b' . $matches[2] . '/>';
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} else {
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$key = '<p' . $matches[2] . '/>';
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}
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$this->_blocks[$key] = "<{$matches[1]}{$matches[3]}>{$text}</{$matches[1]}>";
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return $key;
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}
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/**
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* 自动分段
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*
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* @param string $text
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* @static
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* @access private
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* @return string
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*/
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public function parse($text)
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{
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/** 重置计数器 */
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$this->_uniqueId = 0;
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$this->_blocks = array();
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/** 将已有的段落后面的换行处理掉 */
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$text = preg_replace(array("/<\/p>\s+<p(\s*)/is", "/\s*<br\s*\/?>\s*/is"), array("</p><p\\1", "<br />"), trim($text));
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/** 将所有非自闭合标签解析为唯一的字符串 */
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$foundTagCount = 0;
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$textLength = strlen($text);
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$uniqueIdList = array();
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if (preg_match_all("/<\/\s*([a-z0-9]+)>/is", $text, $matches, PREG_OFFSET_CAPTURE)) {
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foreach ($matches[0] as $key => $match) {
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$tag = $matches[1][$key][0];
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$leftOffset = $match[1] - $textLength;
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$posSingle = strrpos($text, '<' . $tag . '>', $leftOffset);
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$posFix = strrpos($text, '<' . $tag . ' ', $leftOffset);
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$pos = false;
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switch (true) {
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case (false !== $posSingle && false !== $posFix):
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$pos = max($posSingle, $posFix);
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break;
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case false === $posSingle && false !== $posFix:
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$pos = $posFix;
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break;
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case false !== $posSingle && false === $posFix:
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$pos = $posSingle;
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break;
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default:
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break;
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}
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if (false !== $pos) {
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$uniqueId = $this->makeUniqueId();
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$uniqueIdList[$uniqueId] = $tag;
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$tagLength = strlen($tag);
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$text = substr_replace($text, $uniqueId, $pos + 1 + $tagLength, 0);
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$text = substr_replace($text, $uniqueId, $match[1] + 7 + $foundTagCount * 10 + $tagLength, 0); // 7 = 5 + 2
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$foundTagCount ++;
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}
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}
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}
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foreach ($uniqueIdList as $uniqueId => $tag) {
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$text = preg_replace_callback("/<({$tag})({$uniqueId})([^>]*)>(.*)<\/\\1\\2>/is",
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array($this, 'replaceBlockCallback'), $text, 1);
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}
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$text = $this->cutByBlock($text);
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$blocks = array_reverse($this->_blocks);
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foreach ($blocks as $blockKey => $blockValue) {
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$text = str_replace($blockKey, $blockValue, $text);
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}
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return $this->fixPragraph($text);
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}
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}
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