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"""
This module implements the XmlResponse class which adds encoding
discovering through XML encoding declarations to the TextResponse class.
See documentation in docs/topics/request-response.rst
"""
import re
from scrapy.http.response.text import TextResponse
from scrapy.utils.python import memoizemethod_noargs
class XmlResponse(TextResponse):
_template = r'''%s\s*=\s*["']?\s*%s\s*["']?'''
_encoding_re = _template % ('encoding', r'(?P<charset>[\w-]+)')
XMLDECL_RE = re.compile(r'<\?xml\s.*?%s' % _encoding_re, re.I)
@memoizemethod_noargs
def _body_declared_encoding(self):
chunk = self.body[:5000]
match = self.XMLDECL_RE.search(chunk)
return match.group('charset') if match else None
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