162 lines
5.7 KiB
Python
162 lines
5.7 KiB
Python
import os
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import sys
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from collections import defaultdict, OrderedDict
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from marisa_trie import BytesTrie
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this_dir = os.path.realpath(os.path.dirname(__file__))
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sys.path.append(os.path.realpath(os.path.join(os.pardir, os.pardir)))
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sys.path.append(os.path.realpath(os.path.join(os.pardir, os.pardir, os.pardir, 'python')))
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from geodata.encoding import safe_decode
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from geodata.i18n.unicode_paths import DATA_DIR
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from geodata.i18n.normalize import strip_accents
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from address_normalizer.text.normalize import PhraseFilter
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from address_normalizer.text.tokenize import *
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WELL_REPRESENTED_LANGUAGES = set(['en', 'fr', 'it', 'de', 'nl', 'es'])
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DICTIONARIES_DIR = os.path.join(DATA_DIR, 'dictionaries')
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PREFIX_KEY = u'\x02'
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SUFFIX_KEY = u'\x03'
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POSSIBLE_ROMAN_NUMERALS = set(['i', 'ii', 'iii', 'iv', 'v', 'vi', 'vii', 'viii', 'ix',
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'x', 'xi', 'xii', 'xiii', 'xiv', 'xv', 'xvi', 'xvii', 'xviii', 'xix',
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'xx', 'xxx', 'xl', 'l', 'lx', 'lxx', 'lxxx', 'xc',
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'c', 'cc', 'ccc', 'cd', 'd', 'dc', 'dcc', 'dccc', 'cm',
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'm', 'mm', 'mmm', 'mmmm'])
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class DictionaryPhraseFilter(PhraseFilter):
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def __init__(self, *dictionaries):
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self.dictionaries = dictionaries
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def serialize(self, s):
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return s
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def deserialize(self, s):
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return s
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def configure(self, base_dir=DICTIONARIES_DIR):
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kvs = defaultdict(OrderedDict)
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for lang in os.listdir(DICTIONARIES_DIR):
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for filename in self.dictionaries:
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is_suffix_dictionary = 'suffixes' in filename
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is_prefix_dictionary = 'prefixes' in filename
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path = os.path.join(DICTIONARIES_DIR, lang, filename)
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if not os.path.exists(path):
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continue
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for line in open(path):
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line = line.strip()
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if not line:
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continue
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phrases = safe_decode(line).split(u'|')
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if not phrases:
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continue
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canonical = strip_accents(phrases[0])
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for phrase in phrases:
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if phrase in POSSIBLE_ROMAN_NUMERALS:
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continue
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if is_suffix_dictionary:
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phrase = SUFFIX_KEY + phrase[::-1]
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elif is_prefix_dictionary:
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phrase = PREFIX_KEY + phrase
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is_canonical = strip_accents(phrase) == canonical
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kvs[phrase][lang] = is_canonical
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kvs = [(k, '|'.join([v, str(int(c))])) for k, vals in kvs.iteritems() for v, c in vals.iteritems()]
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self.trie = BytesTrie(kvs)
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self.configured = True
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def search_substring(self, s):
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if len(s) == 0:
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return None, 0
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for i in xrange(len(s) + 1):
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if not self.trie.has_keys_with_prefix(s[:i]):
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i -= 1
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break
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if i > 0:
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return (self.trie.get(s[:i]), i)
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else:
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return None, 0
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def basic_filter(self, tokens):
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return super(DictionaryPhraseFilter, self).filter(tokens)
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def filter(self, tokens):
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for c, t, data in self.basic_filter(tokens):
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if c != token_types.PHRASE:
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token = t[1]
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token_len = len(token)
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suffix_search, suffix_len = self.search_substring(SUFFIX_KEY + token[::-1])
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if suffix_search and self.trie.get(token[token_len - (suffix_len - len(SUFFIX_KEY)):]):
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yield (token_types.PHRASE, [(c,) + t], suffix_search)
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continue
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prefix_search, prefix_len = self.search_substring(PREFIX_KEY + token)
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if prefix_search and self.trie.get(token[:(prefix_len - len(PREFIX_KEY))]):
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yield (token_types.PHRASE, [(c,) + t], prefix_search)
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continue
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yield c, t, data
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street_types_gazetteer = DictionaryPhraseFilter('street_types.txt',
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'directionals.txt',
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'concatenated_suffixes_separable.txt',
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'concatenated_suffixes_inseparable.txt',
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'concatenated_prefixes_separable.txt')
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UNKNOWN_LANGUAGE = 'unk'
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AMBIGUOUS_LANGUAGE = 'xxx'
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def disambiguate_language(text, languages):
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valid_languages = OrderedDict(languages)
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tokens = tokenize(safe_decode(text).replace(u'-', u' ').lower())
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current_lang = None
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seen_languages = set()
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for c, t, data in street_types_gazetteer.filter(tokens):
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if c == token_types.PHRASE:
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valid = []
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for d in data:
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lang, canonical = d.split('|')
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canonical = int(canonical)
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is_default = valid_languages.get(lang, None)
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if is_default is None:
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continue
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if is_default or canonical:
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valid.append(lang)
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if seen_languages and valid and not any((l in seen_languages for l in valid)):
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return AMBIGUOUS_LANGUAGE
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if len(valid) == 1:
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current_lang = valid[0]
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else:
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valid = [l for l in valid if valid_languages.get(l)]
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if len(valid) == 1:
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if current_lang is not None and valid[0] != current_lang:
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return AMBIGUOUS_LANGUAGE
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current_lang = valid[0]
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seen_languages.update(valid)
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if current_lang is not None:
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return current_lang
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return UNKNOWN_LANGUAGE
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