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Mark Pilgrim
83 lines
2.8 KiB
Python
Executable File
83 lines
2.8 KiB
Python
Executable File
'''Pluralize English nouns (stage 6)
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Command line usage:
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$ python plural6.py noun
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nouns
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'''
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import re
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def build_match_and_apply_functions(pattern, search, replace):
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def matches_rule(word):
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return re.search(pattern, word)
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def apply_rule(word):
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return re.sub(search, replace, word)
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return [matches_rule, apply_rule]
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class LazyRules:
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rules_filename = 'plural6-rules.txt'
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def __init__(self):
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self.pattern_file = open(self.rules_filename, encoding='utf-8')
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self.cache = []
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def __iter__(self):
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self.cache_index = 0
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return self
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def __next__(self):
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self.cache_index += 1
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if len(self.cache) >= self.cache_index:
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return self.cache[self.cache_index - 1]
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if self.pattern_file.closed:
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raise StopIteration
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line = self.pattern_file.readline()
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if not line:
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self.pattern_file.close()
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raise StopIteration
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pattern, search, replace = line.split(None, 3)
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funcs = build_match_and_apply_functions(
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pattern, search, replace)
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self.cache.append(funcs)
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return funcs
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rules = LazyRules()
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def plural(noun):
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for matches_rule, apply_rule in rules:
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if matches_rule(noun):
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return apply_rule(noun)
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if __name__ == '__main__':
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import sys
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if sys.argv[1:]:
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print(plural(sys.argv[1]))
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else:
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print(__doc__)
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# Copyright (c) 2009, Mark Pilgrim, All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without modification,
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# are permitted provided that the following conditions are met:
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#
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# * Redistributions of source code must retain the above copyright notice,
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# this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright notice,
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# this list of conditions and the following disclaimer in the documentation
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# and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 'AS IS'
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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