mirror of
https://github.com/osm-search/Nominatim.git
synced 2024-11-24 06:22:08 +03:00
633 lines
22 KiB
Python
633 lines
22 KiB
Python
"""
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Tokenizer implementing normalisation as used before Nominatim 4 but using
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libICU instead of the PostgreSQL module.
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"""
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from collections import Counter
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import functools
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import io
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import itertools
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import json
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import logging
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import re
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from textwrap import dedent
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from pathlib import Path
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from icu import Transliterator
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import psycopg2.extras
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from nominatim.db.connection import connect
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from nominatim.db.properties import set_property, get_property
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from nominatim.db.sql_preprocessor import SQLPreprocessor
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DBCFG_NORMALIZATION = "tokenizer_normalization"
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DBCFG_MAXWORDFREQ = "tokenizer_maxwordfreq"
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DBCFG_TRANSLITERATION = "tokenizer_transliteration"
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DBCFG_ABBREVIATIONS = "tokenizer_abbreviations"
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LOG = logging.getLogger()
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def create(dsn, data_dir):
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""" Create a new instance of the tokenizer provided by this module.
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"""
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return LegacyICUTokenizer(dsn, data_dir)
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class LegacyICUTokenizer:
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""" This tokenizer uses libICU to covert names and queries to ASCII.
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Otherwise it uses the same algorithms and data structures as the
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normalization routines in Nominatim 3.
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"""
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def __init__(self, dsn, data_dir):
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self.dsn = dsn
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self.data_dir = data_dir
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self.normalization = None
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self.transliteration = None
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self.abbreviations = None
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def init_new_db(self, config, init_db=True):
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""" Set up a new tokenizer for the database.
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This copies all necessary data in the project directory to make
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sure the tokenizer remains stable even over updates.
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"""
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if config.TOKENIZER_CONFIG:
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cfgfile = Path(config.TOKENIZER_CONFIG)
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else:
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cfgfile = config.config_dir / 'legacy_icu_tokenizer.json'
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rules = json.loads(cfgfile.read_text())
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self.transliteration = ';'.join(rules['normalization']) + ';'
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self.abbreviations = rules["abbreviations"]
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self.normalization = config.TERM_NORMALIZATION
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self._install_php(config)
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self._save_config(config)
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if init_db:
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self.update_sql_functions(config)
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self._init_db_tables(config)
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def init_from_project(self):
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""" Initialise the tokenizer from the project directory.
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"""
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with connect(self.dsn) as conn:
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self.normalization = get_property(conn, DBCFG_NORMALIZATION)
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self.transliteration = get_property(conn, DBCFG_TRANSLITERATION)
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self.abbreviations = json.loads(get_property(conn, DBCFG_ABBREVIATIONS))
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def finalize_import(self, config):
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""" Do any required postprocessing to make the tokenizer data ready
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for use.
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"""
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with connect(self.dsn) as conn:
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sqlp = SQLPreprocessor(conn, config)
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sqlp.run_sql_file(conn, 'tokenizer/legacy_tokenizer_indices.sql')
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def update_sql_functions(self, config):
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""" Reimport the SQL functions for this tokenizer.
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"""
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with connect(self.dsn) as conn:
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max_word_freq = get_property(conn, DBCFG_MAXWORDFREQ)
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sqlp = SQLPreprocessor(conn, config)
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sqlp.run_sql_file(conn, 'tokenizer/legacy_icu_tokenizer.sql',
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max_word_freq=max_word_freq)
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def check_database(self):
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""" Check that the tokenizer is set up correctly.
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"""
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self.init_from_project()
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if self.normalization is None\
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or self.transliteration is None\
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or self.abbreviations is None:
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return "Configuration for tokenizer 'legacy_icu' are missing."
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return None
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def name_analyzer(self):
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""" Create a new analyzer for tokenizing names and queries
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using this tokinzer. Analyzers are context managers and should
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be used accordingly:
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```
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with tokenizer.name_analyzer() as analyzer:
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analyser.tokenize()
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```
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When used outside the with construct, the caller must ensure to
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call the close() function before destructing the analyzer.
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Analyzers are not thread-safe. You need to instantiate one per thread.
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"""
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norm = Transliterator.createFromRules("normalizer", self.normalization)
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trans = Transliterator.createFromRules("trans", self.transliteration)
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return LegacyICUNameAnalyzer(self.dsn, norm, trans, self.abbreviations)
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def _install_php(self, config):
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""" Install the php script for the tokenizer.
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"""
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abbr_inverse = list(zip(*self.abbreviations))
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php_file = self.data_dir / "tokenizer.php"
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php_file.write_text(dedent("""\
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<?php
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@define('CONST_Max_Word_Frequency', {1.MAX_WORD_FREQUENCY});
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@define('CONST_Term_Normalization_Rules', "{0.normalization}");
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@define('CONST_Transliteration', "{0.transliteration}");
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@define('CONST_Abbreviations', array(array('{2}'), array('{3}')));
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require_once('{1.lib_dir.php}/tokenizer/legacy_icu_tokenizer.php');
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""".format(self, config,
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"','".join(abbr_inverse[0]),
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"','".join(abbr_inverse[1]))))
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def _save_config(self, config):
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""" Save the configuration that needs to remain stable for the given
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database as database properties.
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"""
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with connect(self.dsn) as conn:
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set_property(conn, DBCFG_NORMALIZATION, self.normalization)
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set_property(conn, DBCFG_MAXWORDFREQ, config.MAX_WORD_FREQUENCY)
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set_property(conn, DBCFG_TRANSLITERATION, self.transliteration)
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set_property(conn, DBCFG_ABBREVIATIONS, json.dumps(self.abbreviations))
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def _init_db_tables(self, config):
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""" Set up the word table and fill it with pre-computed word
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frequencies.
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"""
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with connect(self.dsn) as conn:
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sqlp = SQLPreprocessor(conn, config)
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sqlp.run_sql_file(conn, 'tokenizer/legacy_tokenizer_tables.sql')
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conn.commit()
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LOG.warning("Precomputing word tokens")
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# get partial words and their frequencies
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words = Counter()
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with self.name_analyzer() as analyzer:
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with conn.cursor(name="words") as cur:
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cur.execute("SELECT svals(name) as v, count(*) FROM place GROUP BY v")
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for name, cnt in cur:
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term = analyzer.make_standard_word(name)
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if term:
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for word in term.split():
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words[word] += cnt
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# copy them back into the word table
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copystr = io.StringIO(''.join(('{}\t{}\n'.format(*args) for args in words.items())))
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with conn.cursor() as cur:
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copystr.seek(0)
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cur.copy_from(copystr, 'word', columns=['word_token', 'search_name_count'])
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cur.execute("""UPDATE word SET word_id = nextval('seq_word')
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WHERE word_id is null""")
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conn.commit()
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class LegacyICUNameAnalyzer:
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""" The legacy analyzer uses the ICU library for splitting names.
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Each instance opens a connection to the database to request the
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normalization.
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"""
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def __init__(self, dsn, normalizer, transliterator, abbreviations):
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self.conn = connect(dsn).connection
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self.conn.autocommit = True
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self.normalizer = normalizer
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self.transliterator = transliterator
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self.abbreviations = abbreviations
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self._cache = _TokenCache()
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def __enter__(self):
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return self
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def __exit__(self, exc_type, exc_value, traceback):
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self.close()
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def close(self):
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""" Free all resources used by the analyzer.
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"""
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if self.conn:
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self.conn.close()
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self.conn = None
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def get_word_token_info(self, conn, words):
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""" Return token information for the given list of words.
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If a word starts with # it is assumed to be a full name
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otherwise is a partial name.
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The function returns a list of tuples with
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(original word, word token, word id).
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The function is used for testing and debugging only
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and not necessarily efficient.
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"""
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tokens = {}
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for word in words:
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if word.startswith('#'):
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tokens[word] = ' ' + self.make_standard_word(word[1:])
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else:
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tokens[word] = self.make_standard_word(word)
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with conn.cursor() as cur:
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cur.execute("""SELECT word_token, word_id
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FROM word, (SELECT unnest(%s::TEXT[]) as term) t
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WHERE word_token = t.term
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and class is null and country_code is null""",
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(list(tokens.values()), ))
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ids = {r[0]: r[1] for r in cur}
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return [(k, v, ids[v]) for k, v in tokens.items()]
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def normalize(self, phrase):
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""" Normalize the given phrase, i.e. remove all properties that
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are irrelevant for search.
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"""
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return self.normalizer.transliterate(phrase)
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@functools.lru_cache(maxsize=1024)
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def make_standard_word(self, name):
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""" Create the normalised version of the input.
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"""
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norm = ' ' + self.transliterator.transliterate(name) + ' '
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for full, abbr in self.abbreviations:
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if full in norm:
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norm = norm.replace(full, abbr)
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return norm.strip()
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def _make_standard_hnr(self, hnr):
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""" Create a normalised version of a housenumber.
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This function takes minor shortcuts on transliteration.
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"""
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if hnr.isdigit():
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return hnr
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return self.transliterator.transliterate(hnr)
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def add_postcodes_from_db(self):
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""" Add postcodes from the location_postcode table to the word table.
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"""
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copystr = io.StringIO()
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with self.conn.cursor() as cur:
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cur.execute("SELECT distinct(postcode) FROM location_postcode")
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for (postcode, ) in cur:
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copystr.write(postcode)
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copystr.write('\t ')
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copystr.write(self.transliterator.transliterate(postcode))
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copystr.write('\tplace\tpostcode\t0\n')
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copystr.seek(0)
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cur.copy_from(copystr, 'word',
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columns=['word', 'word_token', 'class', 'type',
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'search_name_count'])
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# Don't really need an ID for postcodes....
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# cur.execute("""UPDATE word SET word_id = nextval('seq_word')
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# WHERE word_id is null and type = 'postcode'""")
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def update_special_phrases(self, phrases):
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""" Replace the search index for special phrases with the new phrases.
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"""
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norm_phrases = set(((self.normalize(p[0]), p[1], p[2], p[3])
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for p in phrases))
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with self.conn.cursor() as cur:
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# Get the old phrases.
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existing_phrases = set()
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cur.execute("""SELECT word, class, type, operator FROM word
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WHERE class != 'place'
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OR (type != 'house' AND type != 'postcode')""")
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for label, cls, typ, oper in cur:
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existing_phrases.add((label, cls, typ, oper or '-'))
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to_add = norm_phrases - existing_phrases
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to_delete = existing_phrases - norm_phrases
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if to_add:
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copystr = io.StringIO()
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for word, cls, typ, oper in to_add:
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term = self.make_standard_word(word)
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if term:
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copystr.write(word)
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copystr.write('\t ')
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copystr.write(term)
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copystr.write('\t')
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copystr.write(cls)
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copystr.write('\t')
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copystr.write(typ)
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copystr.write('\t')
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copystr.write(oper if oper in ('in', 'near') else '\\N')
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copystr.write('\t0\n')
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copystr.seek(0)
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cur.copy_from(copystr, 'word',
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columns=['word', 'word_token', 'class', 'type',
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'operator', 'search_name_count'])
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if to_delete:
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psycopg2.extras.execute_values(
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cur,
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""" DELETE FROM word USING (VALUES %s) as v(name, in_class, in_type, op)
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WHERE word = name and class = in_class and type = in_type
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and ((op = '-' and operator is null) or op = operator)""",
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to_delete)
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LOG.info("Total phrases: %s. Added: %s. Deleted: %s",
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len(norm_phrases), len(to_add), len(to_delete))
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def add_country_names(self, country_code, names):
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""" Add names for the given country to the search index.
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"""
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full_names = set((self.make_standard_word(n) for n in names))
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full_names.discard('')
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self._add_normalized_country_names(country_code, full_names)
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def _add_normalized_country_names(self, country_code, names):
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""" Add names for the given country to the search index.
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"""
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word_tokens = set((' ' + name for name in names))
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with self.conn.cursor() as cur:
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# Get existing names
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cur.execute("SELECT word_token FROM word WHERE country_code = %s",
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(country_code, ))
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word_tokens.difference_update((t[0] for t in cur))
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if word_tokens:
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cur.execute("""INSERT INTO word (word_id, word_token, country_code,
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search_name_count)
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(SELECT nextval('seq_word'), token, '{}', 0
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FROM unnest(%s) as token)
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""".format(country_code), (list(word_tokens),))
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def process_place(self, place):
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""" Determine tokenizer information about the given place.
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Returns a JSON-serialisable structure that will be handed into
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the database via the token_info field.
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"""
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token_info = _TokenInfo(self._cache)
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names = place.get('name')
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if names:
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full_names = set((self.make_standard_word(name) for name in names.values()))
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full_names.discard('')
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token_info.add_names(self.conn, full_names)
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country_feature = place.get('country_feature')
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if country_feature and re.fullmatch(r'[A-Za-z][A-Za-z]', country_feature):
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self._add_normalized_country_names(country_feature.lower(),
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full_names)
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address = place.get('address')
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if address:
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hnrs = []
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addr_terms = []
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for key, value in address.items():
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if key == 'postcode':
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self._add_postcode(value)
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elif key in ('housenumber', 'streetnumber', 'conscriptionnumber'):
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hnrs.append(value)
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elif key == 'street':
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token_info.add_street(self.conn, self.make_standard_word(value))
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elif key == 'place':
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token_info.add_place(self.conn, self.make_standard_word(value))
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elif not key.startswith('_') and \
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key not in ('country', 'full'):
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addr_terms.append((key, self.make_standard_word(value)))
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if hnrs:
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hnrs = self._split_housenumbers(hnrs)
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token_info.add_housenumbers(self.conn, [self._make_standard_hnr(n) for n in hnrs])
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if addr_terms:
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token_info.add_address_terms(self.conn, addr_terms)
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return token_info.data
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def _add_postcode(self, postcode):
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""" Make sure the normalized postcode is present in the word table.
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"""
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if re.search(r'[:,;]', postcode) is None and not postcode in self._cache.postcodes:
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term = self.make_standard_word(postcode)
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if not term:
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return
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with self.conn.cursor() as cur:
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# no word_id needed for postcodes
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cur.execute("""INSERT INTO word (word, word_token, class, type,
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search_name_count)
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(SELECT pc, %s, 'place', 'postcode', 0
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FROM (VALUES (%s)) as v(pc)
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WHERE NOT EXISTS
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(SELECT * FROM word
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WHERE word = pc and class='place' and type='postcode'))
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""", (' ' + term, postcode))
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self._cache.postcodes.add(postcode)
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@staticmethod
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def _split_housenumbers(hnrs):
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if len(hnrs) > 1 or ',' in hnrs[0] or ';' in hnrs[0]:
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# split numbers if necessary
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simple_list = []
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for hnr in hnrs:
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simple_list.extend((x.strip() for x in re.split(r'[;,]', hnr)))
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if len(simple_list) > 1:
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hnrs = list(set(simple_list))
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else:
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hnrs = simple_list
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return hnrs
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class _TokenInfo:
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""" Collect token information to be sent back to the database.
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"""
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def __init__(self, cache):
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self.cache = cache
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self.data = {}
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@staticmethod
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def _mk_array(tokens):
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return '{%s}' % ','.join((str(s) for s in tokens))
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def add_names(self, conn, names):
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""" Adds token information for the normalised names.
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"""
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# Start with all partial names
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terms = set((part for ns in names for part in ns.split()))
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# Add partials for the full terms (TO BE REMOVED)
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terms.update((n for n in names))
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# Add the full names
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terms.update((' ' + n for n in names))
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self.data['names'] = self._mk_array(self.cache.get_term_tokens(conn, terms))
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def add_housenumbers(self, conn, hnrs):
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""" Extract housenumber information from a list of normalised
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housenumbers.
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"""
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self.data['hnr_tokens'] = self._mk_array(self.cache.get_hnr_tokens(conn, hnrs))
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self.data['hnr'] = ';'.join(hnrs)
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def add_street(self, conn, street):
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""" Add addr:street match terms.
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"""
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if not street:
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return
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term = ' ' + street
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tid = self.cache.names.get(term)
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if tid is None:
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|
with conn.cursor() as cur:
|
|
cur.execute("""SELECT word_id FROM word
|
|
WHERE word_token = %s
|
|
and class is null and type is null""",
|
|
(term, ))
|
|
if cur.rowcount > 0:
|
|
tid = cur.fetchone()[0]
|
|
self.cache.names[term] = tid
|
|
|
|
if tid is not None:
|
|
self.data['street'] = '{%d}' % tid
|
|
|
|
|
|
def add_place(self, conn, place):
|
|
""" Add addr:place search and match terms.
|
|
"""
|
|
if not place:
|
|
return
|
|
|
|
partial_ids = self.cache.get_term_tokens(conn, place.split())
|
|
tid = self.cache.get_term_tokens(conn, [' ' + place])
|
|
|
|
self.data['place_search'] = self._mk_array(itertools.chain(partial_ids, tid))
|
|
self.data['place_match'] = '{%s}' % tid[0]
|
|
|
|
|
|
def add_address_terms(self, conn, terms):
|
|
""" Add additional address terms.
|
|
"""
|
|
tokens = {}
|
|
|
|
for key, value in terms:
|
|
if not value:
|
|
continue
|
|
partial_ids = self.cache.get_term_tokens(conn, value.split())
|
|
term = ' ' + value
|
|
tid = self.cache.names.get(term)
|
|
|
|
if tid is None:
|
|
with conn.cursor() as cur:
|
|
cur.execute("""SELECT word_id FROM word
|
|
WHERE word_token = %s
|
|
and class is null and type is null""",
|
|
(term, ))
|
|
if cur.rowcount > 0:
|
|
tid = cur.fetchone()[0]
|
|
self.cache.names[term] = tid
|
|
|
|
tokens[key] = [self._mk_array(partial_ids),
|
|
'{%s}' % ('' if tid is None else str(tid))]
|
|
|
|
if tokens:
|
|
self.data['addr'] = tokens
|
|
|
|
|
|
class _TokenCache:
|
|
""" Cache for token information to avoid repeated database queries.
|
|
|
|
This cache is not thread-safe and needs to be instantiated per
|
|
analyzer.
|
|
"""
|
|
def __init__(self):
|
|
self.names = {}
|
|
self.postcodes = set()
|
|
self.housenumbers = {}
|
|
|
|
|
|
def get_term_tokens(self, conn, terms):
|
|
""" Get token ids for a list of terms, looking them up in the database
|
|
if necessary.
|
|
"""
|
|
tokens = []
|
|
askdb = []
|
|
|
|
for term in terms:
|
|
token = self.names.get(term)
|
|
if token is None:
|
|
askdb.append(term)
|
|
elif token != 0:
|
|
tokens.append(token)
|
|
|
|
if askdb:
|
|
with conn.cursor() as cur:
|
|
cur.execute("SELECT term, getorcreate_term_id(term) FROM unnest(%s) as term",
|
|
(askdb, ))
|
|
for term, tid in cur:
|
|
self.names[term] = tid
|
|
if tid != 0:
|
|
tokens.append(tid)
|
|
|
|
return tokens
|
|
|
|
|
|
def get_hnr_tokens(self, conn, terms):
|
|
""" Get token ids for a list of housenumbers, looking them up in the
|
|
database if necessary.
|
|
"""
|
|
tokens = []
|
|
askdb = []
|
|
|
|
for term in terms:
|
|
token = self.housenumbers.get(term)
|
|
if token is None:
|
|
askdb.append(term)
|
|
else:
|
|
tokens.append(token)
|
|
|
|
if askdb:
|
|
with conn.cursor() as cur:
|
|
cur.execute("SELECT nr, getorcreate_hnr_id(nr) FROM unnest(%s) as nr",
|
|
(askdb, ))
|
|
for term, tid in cur:
|
|
self.housenumbers[term] = tid
|
|
tokens.append(tid)
|
|
|
|
return tokens
|