"""
Tokenizer implementing normalisation as used before Nominatim 4.
"""
+from collections import OrderedDict
import logging
+import re
import shutil
import psycopg2
self.conn.autocommit = True
psycopg2.extras.register_hstore(self.conn)
+ self._cache = _TokenCache(self.conn)
+
def __enter__(self):
return self
self.conn.close()
self.conn = None
+
+ def add_postcodes_from_db(self):
+ """ Add postcodes from the location_postcode table to the word table.
+ """
+ with self.conn.cursor() as cur:
+ cur.execute("""SELECT count(create_postcode_id(pc))
+ FROM (SELECT distinct(postcode) as pc
+ FROM location_postcode) x""")
+
+
+ def add_country_names(self, country_code, names):
+ """ Add names for the given country to the search index.
+ """
+ with self.conn.cursor() as cur:
+ cur.execute(
+ """INSERT INTO word (word_id, word_token, country_code)
+ (SELECT nextval('seq_word'), lookup_token, %s
+ FROM (SELECT ' ' || make_standard_name(n) as lookup_token
+ FROM unnest(%s)n) y
+ WHERE NOT EXISTS(SELECT * FROM word
+ WHERE word_token = lookup_token and country_code = %s))
+ """, (country_code, names, country_code))
+
+
def process_place(self, place):
""" Determine tokenizer information about the given place.
Returns a JSON-serialisable structure that will be handed into
the database via the token_info field.
"""
- return {}
+ token_info = _TokenInfo(self._cache)
+
+ names = place.get('name')
+
+ if names:
+ token_info.add_names(self.conn, names)
+
+ country_feature = place.get('country_feature')
+ if country_feature and re.fullmatch(r'[A-Za-z][A-Za-z]', country_feature):
+ self.add_country_names(country_feature.lower(), list(names.values()))
+
+ address = place.get('address')
+
+ if address:
+ hnrs = []
+ addr_terms = []
+ for key, value in address.items():
+ if key == 'postcode':
+ self._add_postcode(value)
+ elif key in ('housenumber', 'streetnumber', 'conscriptionnumber'):
+ hnrs.append(value)
+ elif key == 'street':
+ token_info.add_street(self.conn, value)
+ elif key == 'place':
+ token_info.add_place(self.conn, value)
+ elif not key.startswith('_') and \
+ key not in ('country', 'full'):
+ addr_terms.append((key, value))
+
+ if hnrs:
+ token_info.add_housenumbers(self.conn, hnrs)
+
+ if addr_terms:
+ token_info.add_address_terms(self.conn, addr_terms)
+
+ return token_info.data
+
+
+ def _add_postcode(self, postcode):
+ """ Make sure the normalized postcode is present in the word table.
+ """
+ def _create_postcode_from_db(pcode):
+ with self.conn.cursor() as cur:
+ cur.execute('SELECT create_postcode_id(%s)', (pcode, ))
+
+ if re.search(r'[:,;]', postcode) is None:
+ self._cache.postcodes.get(postcode.strip().upper(), _create_postcode_from_db)
+
+
+class _TokenInfo:
+ """ Collect token information to be sent back to the database.
+ """
+ def __init__(self, cache):
+ self.cache = cache
+ self.data = {}
+
+
+ def add_names(self, conn, names):
+ """ Add token information for the names of the place.
+ """
+ with conn.cursor() as cur:
+ # Create the token IDs for all names.
+ self.data['names'] = cur.scalar("SELECT make_keywords(%s)::text",
+ (names, ))
+
+
+ def add_housenumbers(self, conn, hnrs):
+ """ Extract housenumber information from the address.
+ """
+ if len(hnrs) == 1:
+ token = self.cache.get_housenumber(hnrs[0])
+ if token is not None:
+ self.data['hnr_tokens'] = token
+ self.data['hnr'] = hnrs[0]
+ return
+
+ # split numbers if necessary
+ simple_list = []
+ for hnr in hnrs:
+ simple_list.extend((x.strip() for x in re.split(r'[;,]', hnr)))
+
+ if len(simple_list) > 1:
+ simple_list = list(set(simple_list))
+
+ with conn.cursor() as cur:
+ cur.execute("SELECT (create_housenumbers(%s)).* ", (simple_list, ))
+ self.data['hnr_tokens'], self.data['hnr'] = cur.fetchone()
+
+
+ def add_street(self, conn, street):
+ """ Add addr:street match terms.
+ """
+ def _get_street(name):
+ with conn.cursor() as cur:
+ return cur.scalar("SELECT word_ids_from_name(%s)::text", (name, ))
+
+ self.data['street'] = self.cache.streets.get(street, _get_street)
+
+
+ def add_place(self, conn, place):
+ """ Add addr:place search and match terms.
+ """
+ def _get_place(name):
+ with conn.cursor() as cur:
+ cur.execute("""SELECT (addr_ids_from_name(%s)
+ || getorcreate_name_id(make_standard_name(%s), ''))::text,
+ word_ids_from_name(%s)::text""",
+ (name, name, name))
+ return cur.fetchone()
+
+ self.data['place_search'], self.data['place_match'] = \
+ self.cache.places.get(place, _get_place)
+
+
+ def add_address_terms(self, conn, terms):
+ """ Add additional address terms.
+ """
+ def _get_address_term(name):
+ with conn.cursor() as cur:
+ cur.execute("""SELECT addr_ids_from_name(%s)::text,
+ word_ids_from_name(%s)::text""",
+ (name, name))
+ return cur.fetchone()
+
+ tokens = {}
+ for key, value in terms:
+ tokens[key] = self.cache.address_terms.get(value, _get_address_term)
+
+ self.data['addr'] = tokens
+
+
+class _LRU:
+ """ Least recently used cache that accepts a generator function to
+ produce the item when there is a cache miss.
+ """
+
+ def __init__(self, maxsize=128, init_data=None):
+ self.data = init_data or OrderedDict()
+ self.maxsize = maxsize
+ if init_data is not None and len(init_data) > maxsize:
+ self.maxsize = len(init_data)
+
+ def get(self, key, generator):
+ """ Get the item with the given key from the cache. If nothing
+ is found in the cache, generate the value through the
+ generator function and store it in the cache.
+ """
+ value = self.data.get(key)
+ if value is not None:
+ self.data.move_to_end(key)
+ else:
+ value = generator(key)
+ if len(self.data) >= self.maxsize:
+ self.data.popitem(last=False)
+ self.data[key] = value
+
+ return value
+
+
+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, conn):
+ # various LRU caches
+ self.streets = _LRU(maxsize=256)
+ self.places = _LRU(maxsize=128)
+ self.address_terms = _LRU(maxsize=1024)
+
+ # Lookup houseunumbers up to 100 and cache them
+ with conn.cursor() as cur:
+ cur.execute("""SELECT i, ARRAY[getorcreate_housenumber_id(i::text)]::text
+ FROM generate_series(1, 100) as i""")
+ self._cached_housenumbers = {str(r[0]) : r[1] for r in cur}
+
+ # Get postcodes that are already saved
+ postcodes = OrderedDict()
+ with conn.cursor() as cur:
+ cur.execute("""SELECT word FROM word
+ WHERE class ='place' and type = 'postcode'""")
+ for row in cur:
+ postcodes[row[0]] = None
+ self.postcodes = _LRU(maxsize=32, init_data=postcodes)
+
+ def get_housenumber(self, number):
+ """ Get a housenumber token from the cache.
+ """
+ return self._cached_housenumbers.get(number)
projects / nominatim.git / blobdiff