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58 lines
1.6 KiB
Python
58 lines
1.6 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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Module containing the SPCsvLoader class.
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The class allows to load phrases from a csv file.
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"""
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import csv
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import os
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from collections.abc import Iterator
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from nominatim.tools.special_phrases.special_phrase import SpecialPhrase
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from nominatim.errors import UsageError
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class SPCsvLoader(Iterator):
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"""
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Handles loading of special phrases from external csv file.
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"""
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def __init__(self, csv_path):
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super().__init__()
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self.csv_path = csv_path
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self.has_been_read = False
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def __next__(self):
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if self.has_been_read:
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raise StopIteration()
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self.has_been_read = True
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self.check_csv_validity()
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return self.parse_csv()
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def parse_csv(self):
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"""
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Open and parse the given csv file.
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Create the corresponding SpecialPhrases.
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"""
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phrases = set()
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with open(self.csv_path) as file:
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reader = csv.DictReader(file, delimiter=',')
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for row in reader:
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phrases.add(
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SpecialPhrase(row['phrase'], row['class'], row['type'], row['operator'])
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)
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return phrases
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def check_csv_validity(self):
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"""
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Check that the csv file has the right extension.
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"""
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_, extension = os.path.splitext(self.csv_path)
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if extension != '.csv':
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raise UsageError('The file {} is not a csv file.'.format(self.csv_path))
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