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52 lines
1.3 KiB
Python
52 lines
1.3 KiB
Python
import attr
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import unicodedata
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import enum
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# TODO handle grapheme cluster positions?
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# TODO Use type annotations for attr.ib types when support for Python 3.5 is dropped
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# TODO types are not validated (attr does not do this yet)
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@attr.s(frozen=True)
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class ExtractedText:
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segments = attr.ib()
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joiner = attr.ib(type=str)
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@property
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def text(self):
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return self.joiner.join(s.text for s in self.segments)
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def segment_id_for_pos(self, pos):
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i = 0
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for s in self.segments:
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if i <= pos < i + len(s.text):
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return s.id
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i += len(s.text)
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if i <= pos < i + len(self.joiner):
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return None
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i += len(self.joiner)
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class Normalization(enum.Enum):
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NFC = 1
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NFC_MUFI = 2
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def normalize(text, normalization):
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if normalization == Normalization.NFC:
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return unicodedata.normalize('NFC', text)
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else:
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raise ValueError()
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@attr.s(frozen=True)
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class ExtractedTextSegment:
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id = attr.ib(type=str)
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text = attr.ib(type=str)
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@text.validator
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def check(self, attribute, value):
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if normalize(value, self.normalization) != value:
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raise ValueError('String "{}" is not normalized.'.format(value))
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normalization = attr.ib(converter=Normalization, default=Normalization.NFC)
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