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69 lines
2.1 KiB
69 lines
2.1 KiB
6 years ago
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from .formatbase import FormatBase
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from .microdvd import MicroDVDFormat
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from .subrip import SubripFormat
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from .jsonformat import JSONFormat
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from .substation import SubstationFormat
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from .txt_generic import TXTGenericFormat, MPL2Format
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from .exceptions import *
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#: Dict mapping file extensions to format identifiers.
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FILE_EXTENSION_TO_FORMAT_IDENTIFIER = {
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".srt": "srt",
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".ass": "ass",
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".ssa": "ssa",
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".sub": "microdvd",
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".json": "json",
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".txt": "txt_generic",
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}
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#: Dict mapping format identifiers to implementations (FormatBase subclasses).
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FORMAT_IDENTIFIER_TO_FORMAT_CLASS = {
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"srt": SubripFormat,
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"ass": SubstationFormat,
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"ssa": SubstationFormat,
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"microdvd": MicroDVDFormat,
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"json": JSONFormat,
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"txt_generic": TXTGenericFormat,
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"mpl2": MPL2Format,
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}
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def get_format_class(format_):
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"""Format identifier -> format class (ie. subclass of FormatBase)"""
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try:
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return FORMAT_IDENTIFIER_TO_FORMAT_CLASS[format_]
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except KeyError:
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raise UnknownFormatIdentifierError(format_)
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def get_format_identifier(ext):
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"""File extension -> format identifier"""
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try:
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return FILE_EXTENSION_TO_FORMAT_IDENTIFIER[ext]
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except KeyError:
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raise UnknownFileExtensionError(ext)
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def get_file_extension(format_):
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"""Format identifier -> file extension"""
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if format_ not in FORMAT_IDENTIFIER_TO_FORMAT_CLASS:
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raise UnknownFormatIdentifierError(format_)
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for ext, f in FILE_EXTENSION_TO_FORMAT_IDENTIFIER.items():
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if f == format_:
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return ext
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raise RuntimeError("No file extension for format %r" % format_)
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def autodetect_format(content):
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"""Return format identifier for given fragment or raise FormatAutodetectionError."""
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formats = set()
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for impl in FORMAT_IDENTIFIER_TO_FORMAT_CLASS.values():
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guess = impl.guess_format(content)
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if guess is not None:
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formats.add(guess)
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if len(formats) == 1:
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return formats.pop()
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elif not formats:
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raise FormatAutodetectionError("No suitable formats")
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else:
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raise FormatAutodetectionError("Multiple suitable formats (%r)" % formats)
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