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Copy pathMarkdownConverter.php
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180 lines (151 loc) · 7.57 KB
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<?php
/**
* 简单的HTML到Markdown转换器
*/
class MarkdownConverter
{
private $html;
public function __construct($html)
{
$this->html = $html;
}
public function convert()
{
// 如果输入为空，直接返回空字符串
if (empty($this->html)) {
return '';
}
$markdown = $this->html;
// 保存原始的引用和代码块内容
$preserves = [];
$counter = 0;
// 保护<pre>标签中的内容
$markdown = preg_replace_callback('/<pre[^>]*>(.*?)<\/pre>/is', function($matches) use (&$preserves, &$counter) {
$key = "{{{preserve_" . ($counter++) . "}}}";
$preserves[$key] = $matches[0]; // 保留原始HTML
return $key;
}, $markdown);
// 保护<code>标签中的内容
$markdown = preg_replace_callback('/<code[^>]*>(.*?)<\/code>/is', function($matches) use (&$preserves, &$counter) {
$key = "{{{preserve_" . ($counter++) . "}}}";
$preserves[$key] = $matches[0]; // 保留原始HTML
return $key;
}, $markdown);
// 移除多余的空白行
$markdown = preg_replace('/\n\s*\n/', "\n\n", $markdown);
// 转换标题
$markdown = preg_replace('/<h1[^>]*>(.*?)<\/h1>/i', "\n# $1\n", $markdown);
$markdown = preg_replace('/<h2[^>]*>(.*?)<\/h2>/i', "\n## $1\n", $markdown);
$markdown = preg_replace('/<h3[^>]*>(.*?)<\/h3>/i', "\n### $1\n", $markdown);
$markdown = preg_replace('/<h4[^>]*>(.*?)<\/h4>/i', "\n#### $1\n", $markdown);
$markdown = preg_replace('/<h5[^>]*>(.*?)<\/h5>/i', "\n##### $1\n", $markdown);
$markdown = preg_replace('/<h6[^>]*>(.*?)<\/h6>/i', "\n###### $1\n", $markdown);
// 转换粗体
$markdown = preg_replace('/<(strong|b)(\s[^>]*)?>(.*?)<\/(strong|b)>/i', '**$3**', $markdown);
// 转换斜体
$markdown = preg_replace('/<(em|i)(\s[^>]*)?>(.*?)<\/(em|i)>/i', '*$3*', $markdown);
// 转换删除线
$markdown = preg_replace('/<del(\s[^>]*)?>(.*?)<\/del>/i', '~~$2~~', $markdown);
$markdown = preg_replace('/<strike(\s[^>]*)?>(.*?)<\/strike>/i', '~~$2~~', $markdown);
// 转换链接 - 修复格式为[文本](链接)
$markdown = preg_replace('/<a\s+href=["\'](.*?)["\'][^>]*>(.*?)<\/a>/i', '[$2]($1)', $markdown);
// 转换图片
$markdown = preg_replace('/<img\s+src=["\'](.*?)["\'](\s+alt=["\'](.*?)["\'])?[^>]*>/i', '', $markdown);
// 转换无序列表
$markdown = preg_replace_callback('/<ul(\s[^>]*)?>(.*?)<\/ul>/is', function($matches) {
// 提取列表内容
$content = $matches[2];
// 将内容按<li>标签分割，保留所有<li>标签
$pattern = '/(<li(\s[^>]*)?>(.*?)<\/li>)/is';
preg_match_all($pattern, $content, $items);
// 为每个项目添加无序列表标记
$result = "\n";
foreach ($items[0] as $item) {
// 提取<li>标签中的内容
$itemContent = preg_replace('/<li(\s[^>]*)?>(.*?)<\/li>/is', '$2', $item);
// 移除内部可能存在的HTML标签
$itemContent = strip_tags($itemContent);
$result .= "- " . trim($itemContent) . "\n";
}
return $result . "\n";
}, $markdown);
// 转换有序列表
$markdown = preg_replace_callback('/<ol(\s[^>]*)?>(.*?)<\/ol>/is', function($matches) {
// 提取列表内容
$content = $matches[2];
// 将内容按<li>标签分割，保留所有<li>标签
$pattern = '/(<li(\s[^>]*)?>(.*?)<\/li>)/is';
preg_match_all($pattern, $content, $items);
// 为每个项目添加序号
$result = "\n";
for ($i = 0; $i < count($items[0]); $i++) {
// 提取<li>标签中的内容
$itemContent = preg_replace('/<li(\s[^>]*)?>(.*?)<\/li>/is', '$2', $items[0][$i]);
// 移除内部可能存在的HTML标签
$itemContent = strip_tags($itemContent);
$result .= ($i + 1) . ". " . trim($itemContent) . "\n";
}
return $result . "\n";
}, $markdown);
// 转换引用块 - 修复blockquote的处理
$markdown = preg_replace_callback('/<blockquote[^>]*>(.*?)<\/blockquote>/is', function($matches) {
// 先移除内部的HTML标签，保留文本内容
$content = strip_tags($matches[1]);
$content = trim($content);
// 将内容按行分割并为每行添加>前缀
$lines = preg_split('/\r\n|\r|\n/', $content);
$result = "\n";
foreach ($lines as $line) {
$line = trim($line);
if (empty($line)) {
$result .= ">\n";
} else {
$result .= "> " . $line . "\n";
}
}
return $result . "\n";
}, $markdown);
// 转换段落 - 优化处理
$markdown = preg_replace_callback('/<p(\s[^>]*)?>(.*?)<\/p>/is', function($matches) {
// 保留段落内容，但移除内部可能存在的HTML标签
$content = trim(strip_tags($matches[2]));
return "\n\n" . $content . "\n\n";
}, $markdown);
// 转换表格 - 简单处理，保留表格内容
$markdown = preg_replace_callback('/<table[^>]*>(.*?)<\/table>/is', function($matches) {
$tableContent = strip_tags($matches[1], '<tr><td><th>');
$tableContent = preg_replace('/<tr[^>]*>(.*?)<\/tr>/is', "\n$1\n", $tableContent);
$tableContent = preg_replace('/<(td|th)[^>]*>(.*?)<\/(td|th)>/is', "| $2 ", $tableContent);
return "\n\n" . $tableContent . "|\n\n";
}, $markdown);
// 转换换行 - 优化处理
$markdown = preg_replace('/<br\s*\/?>/i', "\n", $markdown);
$markdown = preg_replace('/<br>/i', "\n", $markdown);
// 恢复保护的内容，将pre和code标签转换为Markdown代码块
foreach ($preserves as $key => $value) {
if (strpos($value, '<pre') !== false) {
// 提取pre标签中的内容
$content = preg_replace('/<pre[^>]*>(.*?)<\/pre>/is', '$1', $value);
// 移除可能存在的code标签
$content = preg_replace('/<\/?code[^>]*>/i', '', $content);
// 转换为Markdown代码块
$markdown = str_replace($key, "\n```\n" . $content . "\n```\n", $markdown);
} else if (strpos($value, '<code') !== false) {
// 提取code标签中的内容
$content = preg_replace('/<code[^>]*>(.*?)<\/code>/is', '$1', $value);
// 转换为Markdown行内代码
$markdown = str_replace($key, "`" . $content . "`", $markdown);
} else {
// 其他保留内容直接替换
$markdown = str_replace($key, $value, $markdown);
}
}
// 移除剩余的HTML标签
$markdown = strip_tags($markdown);
// 清理多余的空行
$markdown = preg_replace('/\n{3,}/', "\n\n", $markdown);
// 去除首尾空白
$markdown = trim($markdown);
return $markdown;
}
}