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AZW3 Input: Fix a bug that prevented conversion of AZW3 files that contained an empty CSS media block. Fixes #1426220 [Private bug](https://bugs.launchpad.net/calibre/+bug/1426220)
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@ -314,10 +314,14 @@ def handle_media_queries(raw):
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parser = tinycss.make_full_parser()
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def replace(m):
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sheet = parser.parse_stylesheet(m.group() + '}')
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for mq in sheet.rules[0].media:
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# Only accept KF8 media types
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if (mq.media_type, mq.negated) in {('amzn-mobi', True), ('amzn-kf8', False)}:
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return '@media screen {'
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if len(sheet.rules) > 0:
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for mq in sheet.rules[0].media:
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# Only accept KF8 media types
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if (mq.media_type, mq.negated) in {('amzn-mobi', True), ('amzn-kf8', False)}:
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return '@media screen {'
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else:
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# Empty sheet, doesn't matter what we use
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return '@media screen {'
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return m.group()
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return re.sub(r'@media\s[^{]*{', replace, raw)
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