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81 lines
3.2 KiB
Python
81 lines
3.2 KiB
Python
# Copyright (C) 2021 The Qt Company Ltd.
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# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
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from dataclasses import dataclass
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from typing import Dict, Optional
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@dataclass
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class LanguageCodeEntry:
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part3Code: str
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part2BCode: Optional[str]
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part2TCode: Optional[str]
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part1Code: Optional[str]
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def id(self) -> str:
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if self.part1Code:
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return self.part1Code
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if self.part2BCode:
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return self.part2BCode
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return self.part3Code
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def __repr__(self) -> str:
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parts = [f'{self.__class__.__name__}({self.id()!r}, part3Code={self.part3Code!r}']
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if self.part2BCode is not None and self.part2BCode != self.part3Code:
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parts.append(f', part2BCode={self.part2BCode!r}')
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if self.part2TCode != self.part2BCode:
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parts.append(f', part2TCode={self.part2TCode!r}')
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if self.part1Code is not None:
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parts.append(f', part1Code={self.part1Code!r}')
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parts.append(')')
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return ''.join(parts)
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class LanguageCodeData:
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"""
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Representation of ISO639-2 language code data.
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"""
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def __init__(self, fileName: str):
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"""
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Construct the object populating the data from the given file.
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"""
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self.__codeMap: Dict[str, LanguageCodeEntry] = {}
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with open(fileName, 'r', encoding='utf-8') as stream:
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stream.readline() # skip the header
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for line in stream.readlines():
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part3Code, part2BCode, part2TCode, part1Code, _ = line.split('\t', 4)
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# sanity checks
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assert all(p.isascii() for p in (part3Code, part2BCode, part2TCode, part1Code)), \
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f'Non-ascii characters in code names: {part3Code!r} {part2BCode!r} '\
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f'{part2TCode!r} {part1Code!r}'
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assert len(part3Code) == 3, f'Invalid Part 3 code length for {part3Code!r}'
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assert not part1Code or len(part1Code) == 2, \
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f'Invalid Part 1 code length for {part3Code!r}: {part1Code!r}'
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assert not part2BCode or len(part2BCode) == 3, \
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f'Invalid Part 2B code length for {part3Code!r}: {part2BCode!r}'
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assert not part2TCode or len(part2TCode) == 3, \
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f'Invalid Part 2T code length for {part3Code!r}: {part2TCode!r}'
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assert (part2BCode == '') == (part2TCode == ''), \
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f'Only one Part 2 code is specified for {part3Code!r}: ' \
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f'{part2BCode!r} vs {part2TCode!r}'
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assert not part2TCode or part2TCode == part3Code, \
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f'Part 3 code {part3Code!r} does not match Part 2T code {part2TCode!r}'
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entry = LanguageCodeEntry(part3Code, part2BCode or None,
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part2TCode or None, part1Code or None)
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self.__codeMap[entry.id()] = entry
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def query(self, code: str) -> Optional[LanguageCodeEntry]:
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"""
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Lookup the entry with the given code and return it.
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The entries can be looked up by using either the Alpha2 code or the bibliographical
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Alpha3 code.
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"""
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return self.__codeMap.get(code)
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