59 lines
1.8 KiB
Python
59 lines
1.8 KiB
Python
from language_data.util import data_filename
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LIST_KEYS = {'Description', 'Prefix'}
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def parse_file(file):
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"""
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Take an open file containing the IANA subtag registry, and yield a
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dictionary of information for each subtag it describes.
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"""
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lines = []
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for line in file:
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line = line.rstrip('\n')
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if line == '%%':
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# This is a separator between items. Parse the data we've
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# collected and yield the result.
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yield from parse_item(lines)
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lines.clear()
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elif line.startswith(' '):
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# This is a continuation line. Concatenate it to the previous
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# line, including one of the spaces.
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lines[-1] += line[1:]
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else:
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lines.append(line)
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yield from parse_item(lines)
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def parse_item(lines):
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"""
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Given the lines that form a subtag entry (after joining wrapped lines
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back together), parse the data they contain.
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Returns a generator that yields once if there was any data there
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(and an empty generator if this was just the header).
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"""
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info = {}
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for line in lines:
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key, value = line.split(': ', 1)
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if key in LIST_KEYS:
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info.setdefault(key, []).append(value)
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else:
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assert key not in info
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info[key] = value
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if 'Subtag' in info or 'Tag' in info:
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yield info
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def parse_registry():
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"""
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Yield a sequence of dictionaries, containing the info in the included
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IANA subtag registry file.
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"""
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with open(data_filename('language-subtag-registry.txt'),
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encoding='utf-8') as data_file:
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# 'yield from' instead of returning, so that we only close the file
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# when finished.
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yield from parse_file(data_file)
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