forked from hans/Nominatim
55 lines
1.8 KiB
Python
55 lines
1.8 KiB
Python
# SPDX-License-Identifier: GPL-2.0-only
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#
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# This file is part of Nominatim. (https://nominatim.org)
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#
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# Copyright (C) 2022 by the Nominatim developer community.
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# For a full list of authors see the git log.
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"""
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Specialized processor for postcodes. Supports a 'lookup' variant of the
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token, which produces variants with optional spaces.
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"""
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from nominatim.tokenizer.token_analysis.generic_mutation import MutationVariantGenerator
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### Configuration section
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def configure(rules, normalization_rules): # pylint: disable=W0613
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""" All behaviour is currently hard-coded.
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"""
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return None
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### Analysis section
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def create(normalizer, transliterator, config): # pylint: disable=W0613
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""" Create a new token analysis instance for this module.
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"""
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return PostcodeTokenAnalysis(normalizer, transliterator)
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class PostcodeTokenAnalysis:
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""" Detects common housenumber patterns and normalizes them.
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"""
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def __init__(self, norm, trans):
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self.norm = norm
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self.trans = trans
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self.mutator = MutationVariantGenerator(' ', (' ', ''))
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def normalize(self, name):
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""" Return the standard form of the postcode.
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"""
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return name.strip().upper()
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def get_variants_ascii(self, norm_name):
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""" Compute the spelling variants for the given normalized postcode.
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The official form creates one variant. If a 'lookup version' is
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given, then it will create variants with optional spaces.
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"""
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# Postcodes follow their own transliteration rules.
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# Make sure at this point, that the terms are normalized in a way
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# that they are searchable with the standard transliteration rules.
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return [self.trans.transliterate(term) for term in
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self.mutator.generate([self.norm.transliterate(norm_name)])]
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