8000 Added code to check declared encodings first · Pull Request #48 · buriy/python-readability · GitHub
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Added code to check declared encodings first #48

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Merged
merged 1 commit into from May 18, 2014
Merged

Added code to check declared encodings first #48

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45 changes: 36 additions & 9 deletions readability/encoding.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2,20 +2,47 @@
import chardet

def get_encoding(page):
# Regex for XML and HTML Meta charset declaration
charset_re = re.compile(r'<meta.*?charset=["\']*(.+?)["\'>]', flags=re.I)
pragma_re = re.compile(r'<meta.*?content=["\']*;?charset=(.+?)["\'>]', flags=re.I)
xml_re = re.compile(r'^<\?xml.*?encoding=["\']*(.+?)["\'>]')

declared_encodings = (charset_re.findall(page) +
pragma_re.findall(page) +
xml_re.findall(page))

# Try any declared encodings
if len(declared_encodings) > 0:
for declared_encoding in declared_encodings:
try:
page.decode(custom_decode(declared_encoding))
return custom_decode(declared_encoding)
except UnicodeDecodeError:
pass

# Fallback to chardet if declared encodings fail
text = re.sub('</?[^>]*>\s*', ' ', page)
enc = 'utf-8'
if not text.strip() or len(text) < 10:
return enc # can't guess
try:
diff = text.decode(enc, 'ignore').encode(enc)
sizes = len(diff), len(text)
if abs(len(text) - len(diff)) < max(sizes) * 0.01: # 99% of utf-8
return enc
except UnicodeDecodeError:
pass
res = chardet.detect(text)
enc = res['encoding']
#print '->', enc, "%.2f" % res['confidence']
if enc == 'MacCyrillic':
enc = 'cp1251'
enc = custom_decode(enc)
return enc

def custom_decode(encoding):
"""Overrides encoding when charset declaration
or charset determination is a subset of a larger
charset. Created because of issues with Chinese websites"""
encoding = encoding.lower()
alternates = {
'big5': 'big5hkscs',
'gb2312': 'gb18030',
'ascii': 'utf-8',
'MacCyrillic': 'cp1251',
}
if encoding in alternates:
return alternates[encoding]
else:
return encoding
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