97 lines
2.8 KiB
Python
97 lines
2.8 KiB
Python
"""HTML 文件解析器，使用 bs4 + html2text 将 HTML 转换为 Markdown"""
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import os
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from typing import List, Optional
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from bs4 import BeautifulSoup
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from charset_normalizer import detect
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import html2text
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from exceptions import ParseError
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from parsers.base import BaseParser
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class HtmlParser(BaseParser):
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"""HTML 文件解析器，去除脚本和样式，转换为 Markdown 格式"""
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def supported_extensions(self) -> List[str]:
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return [".html", ".htm"]
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def parse(self, file_path: str) -> str:
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"""
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解析 HTML 文件，自动检测编码，去除 script/style 标签，转换为 Markdown。
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参考 MaxKB HTMLSplitHandle.get_content() 核心逻辑：
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读取文件字节 → 检测编码（优先 meta charset，回退 charset_normalizer）
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→ 解码 → html2text 转 Markdown
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Args:
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file_path: 文件路径
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Returns:
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Markdown 格式的文本内容
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Raises:
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ParseError: 文件无法读取或编码检测失败时抛出
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"""
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file_name = os.path.basename(file_path)
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try:
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with open(file_path, "rb") as f:
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buffer = f.read()
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except Exception as e:
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raise ParseError(file_name, f"文件读取失败: {e}")
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if len(buffer) == 0:
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return ""
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encoding = self._get_encoding(buffer, file_name)
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try:
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content = buffer.decode(encoding)
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except Exception as e:
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raise ParseError(file_name, f"编码解码失败 ({encoding}): {e}")
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converter = html2text.HTML2Text()
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converter.body_width = 0 # Don't wrap lines
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converter.ignore_images = False
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converter.ignore_links = False
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return converter.handle(content)
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@staticmethod
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def _get_encoding(buffer: bytes, file_name: str) -> str:
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"""
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检测 HTML 文件编码。
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优先从 HTML meta charset 标签获取编码，回退到 charset_normalizer 自动检测。
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Args:
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buffer: 文件字节内容
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file_name: 文件名（用于错误信息）
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Returns:
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检测到的编码名称
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Raises:
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ParseError: 编码无法检测时抛出
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"""
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# First try: extract charset from meta tags
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try:
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soup = BeautifulSoup(buffer, "html.parser")
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meta_list = soup.find_all("meta")
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for meta in meta_list:
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if meta.attrs and "charset" in meta.attrs:
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return meta.attrs["charset"]
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except Exception:
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pass
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# Fallback: charset_normalizer
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result = detect(buffer)
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encoding = result.get("encoding") if result else None
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if encoding is None:
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raise ParseError(file_name, "无法检测文件编码")
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return encoding
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