Merge remote-tracking branch 'upstream/master'

[nominatim.git] / nominatim / tokenizer / icu_tokenizer.py

diff --git a/nominatim/tokenizer/icu_tokenizer.py b/nominatim/tokenizer/icu_tokenizer.py
index 22f5e78fd148dcc42e45d63fb95403cb167e5340..799ff559b94599c43e4f66270f82ec94ac0138cc 100644 (file)
--- a/nominatim/tokenizer/icu_tokenizer.py
+++ b/nominatim/tokenizer/icu_tokenizer.py
@@ -1,79 +1,91 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# This file is part of Nominatim. (https://nominatim.org)
+#
+# Copyright (C) 2022 by the Nominatim developer community.
+# For a full list of authors see the git log.

 """
 Tokenizer implementing normalisation as used before Nominatim 4 but using
 libICU instead of the PostgreSQL module.
 """
 """
 Tokenizer implementing normalisation as used before Nominatim 4 but using
 libICU instead of the PostgreSQL module.
 """

-from collections import Counter
+from typing import Optional, Sequence, List, Tuple, Mapping, Any, cast, \
+                   Dict, Set, Iterable

 import itertools
 import json
 import logging
 import itertools
 import json
 import logging

-import re
+from pathlib import Path

 from textwrap import dedent
 
 from textwrap import dedent
 

-from nominatim.db.connection import connect
-from nominatim.db.properties import set_property, get_property
+from nominatim.db.connection import connect, Connection, Cursor
+from nominatim.config import Configuration

 from nominatim.db.utils import CopyBuffer
 from nominatim.db.sql_preprocessor import SQLPreprocessor
 from nominatim.db.utils import CopyBuffer
 from nominatim.db.sql_preprocessor import SQLPreprocessor

+from nominatim.data.place_info import PlaceInfo

 from nominatim.tokenizer.icu_rule_loader import ICURuleLoader
 from nominatim.tokenizer.icu_rule_loader import ICURuleLoader

-from nominatim.tokenizer.icu_name_processor import ICUNameProcessor, ICUNameProcessorRules
+from nominatim.tokenizer.place_sanitizer import PlaceSanitizer
+from nominatim.data.place_name import PlaceName
+from nominatim.tokenizer.icu_token_analysis import ICUTokenAnalysis

 from nominatim.tokenizer.base import AbstractAnalyzer, AbstractTokenizer
 
 DBCFG_TERM_NORMALIZATION = "tokenizer_term_normalization"
 
 LOG = logging.getLogger()
 
 from nominatim.tokenizer.base import AbstractAnalyzer, AbstractTokenizer
 
 DBCFG_TERM_NORMALIZATION = "tokenizer_term_normalization"
 
 LOG = logging.getLogger()
 

-def create(dsn, data_dir):
+def create(dsn: str, data_dir: Path) -> 'ICUTokenizer':

     """ Create a new instance of the tokenizer provided by this module.
     """
     """ Create a new instance of the tokenizer provided by this module.
     """

-    return LegacyICUTokenizer(dsn, data_dir)
+    return ICUTokenizer(dsn, data_dir)

 
 
 
 

-class LegacyICUTokenizer(AbstractTokenizer):
-    """ This tokenizer uses libICU to covert names and queries to ASCII.
+class ICUTokenizer(AbstractTokenizer):
+    """ This tokenizer uses libICU to convert names and queries to ASCII.

         Otherwise it uses the same algorithms and data structures as the
         normalization routines in Nominatim 3.
     """
 
         Otherwise it uses the same algorithms and data structures as the
         normalization routines in Nominatim 3.
     """
 

-    def __init__(self, dsn, data_dir):
+    def __init__(self, dsn: str, data_dir: Path) -> None:

         self.dsn = dsn
         self.data_dir = data_dir
         self.dsn = dsn
         self.data_dir = data_dir

-        self.naming_rules = None
-        self.term_normalization = None
+        self.loader: Optional[ICURuleLoader] = None

 
 
 
 

-    def init_new_db(self, config, init_db=True):
+    def init_new_db(self, config: Configuration, init_db: bool = True) -> None:

         """ Set up a new tokenizer for the database.
 
             This copies all necessary data in the project directory to make
             sure the tokenizer remains stable even over updates.
         """
         """ Set up a new tokenizer for the database.
 
             This copies all necessary data in the project directory to make
             sure the tokenizer remains stable even over updates.
         """

-        loader = ICURuleLoader(config.load_sub_configuration('icu_tokenizer.yaml',
-                                                             config='TOKENIZER_CONFIG'))
-        self.naming_rules = ICUNameProcessorRules(loader=loader)
-        self.term_normalization = config.TERM_NORMALIZATION
+        self.loader = ICURuleLoader(config)

 
 

-        self._install_php(config.lib_dir.php)
-        self._save_config(config)
+        self._install_php(config.lib_dir.php, overwrite=True)
+        self._save_config()

 
         if init_db:
             self.update_sql_functions(config)
             self._init_db_tables(config)
 
 
 
         if init_db:
             self.update_sql_functions(config)
             self._init_db_tables(config)
 
 

-    def init_from_project(self):
+    def init_from_project(self, config: Configuration) -> None:

         """ Initialise the tokenizer from the project directory.
         """
         """ Initialise the tokenizer from the project directory.
         """

+        self.loader = ICURuleLoader(config)
+

         with connect(self.dsn) as conn:
         with connect(self.dsn) as conn:

-            self.naming_rules = ICUNameProcessorRules(conn=conn)
-            self.term_normalization = get_property(conn, DBCFG_TERM_NORMALIZATION)
+            self.loader.load_config_from_db(conn)
+
+        self._install_php(config.lib_dir.php, overwrite=False)

 
 
 
 

-    def finalize_import(self, _):
+    def finalize_import(self, config: Configuration) -> None:

         """ Do any required postprocessing to make the tokenizer data ready
             for use.
         """
         """ Do any required postprocessing to make the tokenizer data ready
             for use.
         """

+        with connect(self.dsn) as conn:
+            sqlp = SQLPreprocessor(conn, config)
+            sqlp.run_sql_file(conn, 'tokenizer/legacy_tokenizer_indices.sql')

 
 
 
 

-    def update_sql_functions(self, config):
+    def update_sql_functions(self, config: Configuration) -> None:

         """ Reimport the SQL functions for this tokenizer.
         """
         with connect(self.dsn) as conn:
         """ Reimport the SQL functions for this tokenizer.
         """
         with connect(self.dsn) as conn:


@@ -81,18 +93,77 @@ class LegacyICUTokenizer(AbstractTokenizer):
             sqlp.run_sql_file(conn, 'tokenizer/icu_tokenizer.sql')
 
 
             sqlp.run_sql_file(conn, 'tokenizer/icu_tokenizer.sql')
 
 

-    def check_database(self):
+    def check_database(self, config: Configuration) -> None:

         """ Check that the tokenizer is set up correctly.
         """
         """ Check that the tokenizer is set up correctly.
         """

-        self.init_from_project()
+        # Will throw an error if there is an issue.
+        self.init_from_project(config)
+
+
+    def update_statistics(self) -> None:
+        """ Recompute frequencies for all name words.
+        """
+        with connect(self.dsn) as conn:
+            if conn.table_exists('search_name'):
+                with conn.cursor() as cur:
+                    cur.drop_table("word_frequencies")
+                    LOG.info("Computing word frequencies")
+                    cur.execute("""CREATE TEMP TABLE word_frequencies AS
+                                     SELECT unnest(name_vector) as id, count(*)
+                                     FROM search_name GROUP BY id""")
+                    cur.execute("CREATE INDEX ON word_frequencies(id)")
+                    LOG.info("Update word table with recomputed frequencies")
+                    cur.execute("""UPDATE word
+                                   SET info = info || jsonb_build_object('count', count)
+                                   FROM word_frequencies WHERE word_id = id""")
+                    cur.drop_table("word_frequencies")
+            conn.commit()
+
+
+    def _cleanup_housenumbers(self) -> None:
+        """ Remove unused house numbers.
+        """
+        with connect(self.dsn) as conn:
+            if not conn.table_exists('search_name'):
+                return
+            with conn.cursor(name="hnr_counter") as cur:
+                cur.execute("""SELECT DISTINCT word_id, coalesce(info->>'lookup', word_token)
+                               FROM word
+                               WHERE type = 'H'
+                                 AND NOT EXISTS(SELECT * FROM search_name
+                                                WHERE ARRAY[word.word_id] && name_vector)
+                                 AND (char_length(coalesce(word, word_token)) > 6
+                                      OR coalesce(word, word_token) not similar to '\\d+')
+                            """)
+                candidates = {token: wid for wid, token in cur}
+            with conn.cursor(name="hnr_counter") as cur:
+                cur.execute("""SELECT housenumber FROM placex
+                               WHERE housenumber is not null
+                                     AND (char_length(housenumber) > 6
+                                          OR housenumber not similar to '\\d+')
+                            """)
+                for row in cur:
+                    for hnr in row[0].split(';'):
+                        candidates.pop(hnr, None)
+            LOG.info("There are %s outdated housenumbers.", len(candidates))
+            LOG.debug("Outdated housenumbers: %s", candidates.keys())
+            if candidates:
+                with conn.cursor() as cur:
+                    cur.execute("""DELETE FROM word WHERE word_id = any(%s)""",
+                                (list(candidates.values()), ))
+                conn.commit()

 
 

-        if self.naming_rules is None:
-            return "Configuration for tokenizer 'icu' are missing."

 
 

-        return None
+
+    def update_word_tokens(self) -> None:
+        """ Remove unused tokens.
+        """
+        LOG.warning("Cleaning up housenumber tokens.")
+        self._cleanup_housenumbers()
+        LOG.warning("Tokenizer house-keeping done.")

 
 
 
 

-    def name_analyzer(self):
+    def name_analyzer(self) -> 'ICUNameAnalyzer':

         """ Create a new analyzer for tokenizing names and queries
             using this tokinzer. Analyzers are context managers and should
             be used accordingly:
         """ Create a new analyzer for tokenizing names and queries
             using this tokinzer. Analyzers are context managers and should
             be used accordingly:


@@ -107,32 +178,48 @@ class LegacyICUTokenizer(AbstractTokenizer):
 
             Analyzers are not thread-safe. You need to instantiate one per thread.
         """
 
             Analyzers are not thread-safe. You need to instantiate one per thread.
         """

-        return LegacyICUNameAnalyzer(self.dsn, ICUNameProcessor(self.naming_rules))
+        assert self.loader is not None
+        return ICUNameAnalyzer(self.dsn, self.loader.make_sanitizer(),
+                               self.loader.make_token_analysis())
+
+
+    def most_frequent_words(self, conn: Connection, num: int) -> List[str]:
+        """ Return a list of the `num` most frequent full words
+            in the database.
+        """
+        with conn.cursor() as cur:
+            cur.execute("""SELECT word, sum((info->>'count')::int) as count
+                             FROM word WHERE type = 'W'
+                             GROUP BY word
+                             ORDER BY count DESC LIMIT %s""", (num,))
+            return list(s[0].split('@')[0] for s in cur)

 
 
 
 

-    def _install_php(self, phpdir):
+    def _install_php(self, phpdir: Path, overwrite: bool = True) -> None:

         """ Install the php script for the tokenizer.
         """
         """ Install the php script for the tokenizer.
         """

+        assert self.loader is not None

         php_file = self.data_dir / "tokenizer.php"
         php_file = self.data_dir / "tokenizer.php"

-        php_file.write_text(dedent(f"""\
-            <?php
-            @define('CONST_Max_Word_Frequency', 10000000);
-            @define('CONST_Term_Normalization_Rules', "{self.term_normalization}");
-            @define('CONST_Transliteration', "{self.naming_rules.search_rules}");
-            require_once('{phpdir}/tokenizer/icu_tokenizer.php');"""))

 
 

+        if not php_file.exists() or overwrite:
+            php_file.write_text(dedent(f"""\
+                <?php
+                @define('CONST_Max_Word_Frequency', 10000000);
+                @define('CONST_Term_Normalization_Rules', "{self.loader.normalization_rules}");
+                @define('CONST_Transliteration', "{self.loader.get_search_rules()}");
+                require_once('{phpdir}/tokenizer/icu_tokenizer.php');"""), encoding='utf-8')

 
 

-    def _save_config(self, config):
+
+    def _save_config(self) -> None:

         """ Save the configuration that needs to remain stable for the given
             database as database properties.
         """
         """ Save the configuration that needs to remain stable for the given
             database as database properties.
         """

+        assert self.loader is not None

         with connect(self.dsn) as conn:
         with connect(self.dsn) as conn:

-            self.naming_rules.save_rules(conn)
-
-            set_property(conn, DBCFG_TERM_NORMALIZATION, self.term_normalization)
+            self.loader.save_config_to_db(conn)

 
 
 
 

-    def _init_db_tables(self, config):
+    def _init_db_tables(self, config: Configuration) -> None:

         """ Set up the word table and fill it with pre-computed word
             frequencies.
         """
         """ Set up the word table and fill it with pre-computed word
             frequencies.
         """


@@ -141,62 +228,25 @@ class LegacyICUTokenizer(AbstractTokenizer):
             sqlp.run_sql_file(conn, 'tokenizer/icu_tokenizer_tables.sql')
             conn.commit()
 
             sqlp.run_sql_file(conn, 'tokenizer/icu_tokenizer_tables.sql')
             conn.commit()
 

-            LOG.warning("Precomputing word tokens")
-
-            # get partial words and their frequencies
-            words = self._count_partial_terms(conn)
-
-            # copy them back into the word table
-            with CopyBuffer() as copystr:
-                for term, cnt in words.items():
-                    copystr.add('w', term, json.dumps({'count': cnt}))
-
-                with conn.cursor() as cur:
-                    copystr.copy_out(cur, 'word',
-                                     columns=['type', 'word_token', 'info'])
-                    cur.execute("""UPDATE word SET word_id = nextval('seq_word')
-                                   WHERE word_id is null and type = 'w'""")
-
-            conn.commit()
-
-    def _count_partial_terms(self, conn):
-        """ Count the partial terms from the names in the place table.
-        """
-        words = Counter()
-        name_proc = ICUNameProcessor(self.naming_rules)
-
-        with conn.cursor(name="words") as cur:
-            cur.execute(""" SELECT v, count(*) FROM
-                              (SELECT svals(name) as v FROM place)x
-                            WHERE length(v) < 75 GROUP BY v""")
-
-            for name, cnt in cur:
-                terms = set()
-                for word in name_proc.get_variants_ascii(name_proc.get_normalized(name)):
-                    if ' ' in word:
-                        terms.update(word.split())
-                for term in terms:
-                    words[term] += cnt
-
-        return words

 
 

-
-class LegacyICUNameAnalyzer(AbstractAnalyzer):
-    """ The legacy analyzer uses the ICU library for splitting names.
+class ICUNameAnalyzer(AbstractAnalyzer):
+    """ The ICU analyzer uses the ICU library for splitting names.

 
         Each instance opens a connection to the database to request the
         normalization.
     """
 
 
         Each instance opens a connection to the database to request the
         normalization.
     """
 

-    def __init__(self, dsn, name_proc):
-        self.conn = connect(dsn).connection
+    def __init__(self, dsn: str, sanitizer: PlaceSanitizer,
+                 token_analysis: ICUTokenAnalysis) -> None:
+        self.conn: Optional[Connection] = connect(dsn).connection

         self.conn.autocommit = True
         self.conn.autocommit = True

-        self.name_processor = name_proc
+        self.sanitizer = sanitizer
+        self.token_analysis = token_analysis

 
         self._cache = _TokenCache()
 
 
 
         self._cache = _TokenCache()
 
 

-    def close(self):
+    def close(self) -> None:

         """ Free all resources used by the analyzer.
         """
         if self.conn:
         """ Free all resources used by the analyzer.
         """
         if self.conn:


@@ -204,7 +254,20 @@ class LegacyICUNameAnalyzer(AbstractAnalyzer):
             self.conn = None
 
 
             self.conn = None
 
 

-    def get_word_token_info(self, words):
+    def _search_normalized(self, name: str) -> str:
+        """ Return the search token transliteration of the given name.
+        """
+        return cast(str, self.token_analysis.search.transliterate(name)).strip()
+
+
+    def _normalized(self, name: str) -> str:
+        """ Return the normalized version of the given name with all
+            non-relevant information removed.
+        """
+        return cast(str, self.token_analysis.normalizer.transliterate(name)).strip()
+
+
+    def get_word_token_info(self, words: Sequence[str]) -> List[Tuple[str, str, int]]:

         """ Return token information for the given list of words.
             If a word starts with # it is assumed to be a full name
             otherwise is a partial name.
         """ Return token information for the given list of words.
             If a word starts with # it is assumed to be a full name
             otherwise is a partial name.


@@ -215,13 +278,14 @@ class LegacyICUNameAnalyzer(AbstractAnalyzer):
             The function is used for testing and debugging only
             and not necessarily efficient.
         """
             The function is used for testing and debugging only
             and not necessarily efficient.
         """

+        assert self.conn is not None

         full_tokens = {}
         partial_tokens = {}
         for word in words:
             if word.startswith('#'):
         full_tokens = {}
         partial_tokens = {}
         for word in words:
             if word.startswith('#'):

-                full_tokens[word] = self.name_processor.get_search_normalized(word[1:])
+                full_tokens[word] = self._search_normalized(word[1:])

             else:
             else:

-                partial_tokens[word] = self.name_processor.get_search_normalized(word)
+                partial_tokens[word] = self._search_normalized(word)

 
         with self.conn.cursor() as cur:
             cur.execute("""SELECT word_token, word_id
 
         with self.conn.cursor() as cur:
             cur.execute("""SELECT word_token, word_id


@@ -237,8 +301,7 @@ class LegacyICUNameAnalyzer(AbstractAnalyzer):
                + [(k, v, part_ids.get(v, None)) for k, v in partial_tokens.items()]
 
 
                + [(k, v, part_ids.get(v, None)) for k, v in partial_tokens.items()]
 
 

-    @staticmethod
-    def normalize_postcode(postcode):
+    def normalize_postcode(self, postcode: str) -> str:

         """ Convert the postcode to a standardized form.
 
             This function must yield exactly the same result as the SQL function
         """ Convert the postcode to a standardized form.
 
             This function must yield exactly the same result as the SQL function


@@ -247,53 +310,92 @@ class LegacyICUNameAnalyzer(AbstractAnalyzer):
         return postcode.strip().upper()
 
 
         return postcode.strip().upper()
 
 

-    def _make_standard_hnr(self, hnr):
-        """ Create a normalised version of a housenumber.
-
-            This function takes minor shortcuts on transliteration.
-        """
-        return self.name_processor.get_search_normalized(hnr)
-
-    def update_postcodes_from_db(self):
+    def update_postcodes_from_db(self) -> None:

         """ Update postcode tokens in the word table from the location_postcode
             table.
         """
         """ Update postcode tokens in the word table from the location_postcode
             table.
         """

-        to_delete = []
+        assert self.conn is not None
+        analyzer = self.token_analysis.analysis.get('@postcode')
+

         with self.conn.cursor() as cur:
         with self.conn.cursor() as cur:

-            # This finds us the rows in location_postcode and word that are
-            # missing in the other table.
-            cur.execute("""SELECT * FROM
-                            (SELECT pc, word FROM
-                              (SELECT distinct(postcode) as pc FROM location_postcode) p
-                              FULL JOIN
-                              (SELECT word FROM word WHERE type = 'P') w
-                              ON pc = word) x
-                           WHERE pc is null or word is null""")
-
-            with CopyBuffer() as copystr:
-                for postcode, word in cur:
-                    if postcode is None:
-                        to_delete.append(word)
-                    else:
-                        copystr.add(self.name_processor.get_search_normalized(postcode),
-                                    'P', postcode)
-
-                if to_delete:
-                    cur.execute("""DELETE FROM WORD
-                                   WHERE type ='P' and word = any(%s)
-                                """, (to_delete, ))
-
-                copystr.copy_out(cur, 'word',
-                                 columns=['word_token', 'type', 'word'])
-
-
-    def update_special_phrases(self, phrases, should_replace):
+            # First get all postcode names currently in the word table.
+            cur.execute("SELECT DISTINCT word FROM word WHERE type = 'P'")
+            word_entries = set((entry[0] for entry in cur))
+
+            # Then compute the required postcode names from the postcode table.
+            needed_entries = set()
+            cur.execute("SELECT country_code, postcode FROM location_postcode")
+            for cc, postcode in cur:
+                info = PlaceInfo({'country_code': cc,
+                                  'class': 'place', 'type': 'postcode',
+                                  'address': {'postcode': postcode}})
+                address = self.sanitizer.process_names(info)[1]
+                for place in address:
+                    if place.kind == 'postcode':
+                        if analyzer is None:
+                            postcode_name = place.name.strip().upper()
+                            variant_base = None
+                        else:
+                            postcode_name = analyzer.get_canonical_id(place)
+                            variant_base = place.get_attr("variant")
+
+                        if variant_base:
+                            needed_entries.add(f'{postcode_name}@{variant_base}')
+                        else:
+                            needed_entries.add(postcode_name)
+                        break
+
+        # Now update the word table.
+        self._delete_unused_postcode_words(word_entries - needed_entries)
+        self._add_missing_postcode_words(needed_entries - word_entries)
+
+    def _delete_unused_postcode_words(self, tokens: Iterable[str]) -> None:
+        assert self.conn is not None
+        if tokens:
+            with self.conn.cursor() as cur:
+                cur.execute("DELETE FROM word WHERE type = 'P' and word = any(%s)",
+                            (list(tokens), ))
+
+    def _add_missing_postcode_words(self, tokens: Iterable[str]) -> None:
+        assert self.conn is not None
+        if not tokens:
+            return
+
+        analyzer = self.token_analysis.analysis.get('@postcode')
+        terms = []
+
+        for postcode_name in tokens:
+            if '@' in postcode_name:
+                term, variant = postcode_name.split('@', 2)
+                term = self._search_normalized(term)
+                if analyzer is None:
+                    variants = [term]
+                else:
+                    variants = analyzer.compute_variants(variant)
+                    if term not in variants:
+                        variants.append(term)
+            else:
+                variants = [self._search_normalized(postcode_name)]
+            terms.append((postcode_name, variants))
+
+        if terms:
+            with self.conn.cursor() as cur:
+                cur.execute_values("""SELECT create_postcode_word(pc, var)
+                                      FROM (VALUES %s) AS v(pc, var)""",
+                                   terms)
+
+
+
+
+    def update_special_phrases(self, phrases: Iterable[Tuple[str, str, str, str]],
+                               should_replace: bool) -> None:

         """ Replace the search index for special phrases with the new phrases.
             If `should_replace` is True, then the previous set of will be
             completely replaced. Otherwise the phrases are added to the
             already existing ones.
         """
         """ Replace the search index for special phrases with the new phrases.
             If `should_replace` is True, then the previous set of will be
             completely replaced. Otherwise the phrases are added to the
             already existing ones.
         """

-        norm_phrases = set(((self.name_processor.get_normalized(p[0]), p[1], p[2], p[3])
+        assert self.conn is not None
+        norm_phrases = set(((self._normalized(p[0]), p[1], p[2], p[3])

                             for p in phrases))
 
         with self.conn.cursor() as cur:
                             for p in phrases))
 
         with self.conn.cursor() as cur:


@@ -315,7 +417,9 @@ class LegacyICUNameAnalyzer(AbstractAnalyzer):
                  len(norm_phrases), added, deleted)
 
 
                  len(norm_phrases), added, deleted)
 
 

-    def _add_special_phrases(self, cursor, new_phrases, existing_phrases):
+    def _add_special_phrases(self, cursor: Cursor,
+                             new_phrases: Set[Tuple[str, str, str, str]],
+                             existing_phrases: Set[Tuple[str, str, str, str]]) -> int:

         """ Add all phrases to the database that are not yet there.
         """
         to_add = new_phrases - existing_phrases
         """ Add all phrases to the database that are not yet there.
         """
         to_add = new_phrases - existing_phrases


@@ -323,7 +427,7 @@ class LegacyICUNameAnalyzer(AbstractAnalyzer):
         added = 0
         with CopyBuffer() as copystr:
             for word, cls, typ, oper in to_add:
         added = 0
         with CopyBuffer() as copystr:
             for word, cls, typ, oper in to_add:

-                term = self.name_processor.get_search_normalized(word)
+                term = self._search_normalized(word)

                 if term:
                     copystr.add(term, 'S', word,
                                 json.dumps({'class': cls, 'type': typ,
                 if term:
                     copystr.add(term, 'S', word,
                                 json.dumps({'class': cls, 'type': typ,


@@ -336,9 +440,10 @@ class LegacyICUNameAnalyzer(AbstractAnalyzer):
         return added
 
 
         return added
 
 

-    @staticmethod
-    def _remove_special_phrases(cursor, new_phrases, existing_phrases):
-        """ Remove all phrases from the databse that are no longer in the
+    def _remove_special_phrases(self, cursor: Cursor,
+                             new_phrases: Set[Tuple[str, str, str, str]],
+                             existing_phrases: Set[Tuple[str, str, str, str]]) -> int:
+        """ Remove all phrases from the database that are no longer in the

             new phrase list.
         """
         to_delete = existing_phrases - new_phrases
             new phrase list.
         """
         to_delete = existing_phrases - new_phrases


@@ -354,88 +459,154 @@ class LegacyICUNameAnalyzer(AbstractAnalyzer):
         return len(to_delete)
 
 
         return len(to_delete)
 
 

-    def add_country_names(self, country_code, names):
-        """ Add names for the given country to the search index.
+    def add_country_names(self, country_code: str, names: Mapping[str, str]) -> None:
+        """ Add default names for the given country to the search index.
+        """
+        # Make sure any name preprocessing for country names applies.
+        info = PlaceInfo({'name': names, 'country_code': country_code,
+                          'rank_address': 4, 'class': 'boundary',
+                          'type': 'administrative'})
+        self._add_country_full_names(country_code,
+                                     self.sanitizer.process_names(info)[0],
+                                     internal=True)
+
+
+    def _add_country_full_names(self, country_code: str, names: Sequence[PlaceName],
+                                internal: bool = False) -> None:
+        """ Add names for the given country from an already sanitized
+            name list.

         """
         """

+        assert self.conn is not None

         word_tokens = set()
         word_tokens = set()

-        for name in self._compute_full_names(names):
-            norm_name = self.name_processor.get_search_normalized(name)
+        for name in names:
+            norm_name = self._search_normalized(name.name)

             if norm_name:
                 word_tokens.add(norm_name)
 
         with self.conn.cursor() as cur:
             # Get existing names
             if norm_name:
                 word_tokens.add(norm_name)
 
         with self.conn.cursor() as cur:
             # Get existing names

-            cur.execute("""SELECT word_token FROM word
-                            WHERE type = 'C' and word = %s""",
+            cur.execute("""SELECT word_token, coalesce(info ? 'internal', false) as is_internal
+                             FROM word
+                             WHERE type = 'C' and word = %s""",

                         (country_code, ))
                         (country_code, ))

-            word_tokens.difference_update((t[0] for t in cur))
+            # internal/external names
+            existing_tokens: Dict[bool, Set[str]] = {True: set(), False: set()}
+            for word in cur:
+                existing_tokens[word[1]].add(word[0])
+
+            # Delete names that no longer exist.
+            gone_tokens = existing_tokens[internal] - word_tokens
+            if internal:
+                gone_tokens.update(existing_tokens[False] & word_tokens)
+            if gone_tokens:
+                cur.execute("""DELETE FROM word
+                               USING unnest(%s) as token
+                               WHERE type = 'C' and word = %s
+                                     and word_token = token""",
+                            (list(gone_tokens), country_code))

 
             # Only add those names that are not yet in the list.
 
             # Only add those names that are not yet in the list.

-            if word_tokens:
-                cur.execute("""INSERT INTO word (word_token, type, word)
-                               (SELECT token, 'C', %s
-                                FROM unnest(%s) as token)
-                            """, (country_code, list(word_tokens)))
-
-            # No names are deleted at the moment.
-            # If deletion is made possible, then the static names from the
-            # initial 'country_name' table should be kept.
-
-
-    def process_place(self, place):
+            new_tokens = word_tokens - existing_tokens[True]
+            if not internal:
+                new_tokens -= existing_tokens[False]
+            if new_tokens:
+                if internal:
+                    sql = """INSERT INTO word (word_token, type, word, info)
+                               (SELECT token, 'C', %s, '{"internal": "yes"}'
+                                  FROM unnest(%s) as token)
+                           """
+                else:
+                    sql = """INSERT INTO word (word_token, type, word)
+                                   (SELECT token, 'C', %s
+                                    FROM unnest(%s) as token)
+                          """
+                cur.execute(sql, (country_code, list(new_tokens)))
+
+
+    def process_place(self, place: PlaceInfo) -> Mapping[str, Any]:

         """ Determine tokenizer information about the given place.
 
         """ Determine tokenizer information about the given place.
 

-            Returns a JSON-serialisable structure that will be handed into
+            Returns a JSON-serializable structure that will be handed into

             the database via the token_info field.
         """
             the database via the token_info field.
         """

-        token_info = _TokenInfo(self._cache)
+        token_info = _TokenInfo()

 
 

-        names = place.get('name')
+        names, address = self.sanitizer.process_names(place)

 
         if names:
 
         if names:

-            fulls, partials = self._compute_name_tokens(names)
-
-            token_info.add_names(fulls, partials)
+            token_info.set_names(*self._compute_name_tokens(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(), names)
+            if place.is_country():
+                assert place.country_code is not None
+                self._add_country_full_names(place.country_code, names)

 
 

-        address = place.get('address')

         if address:
             self._process_place_address(token_info, address)
 
         if address:
             self._process_place_address(token_info, address)
 

-        return token_info.data
-
-
-    def _process_place_address(self, token_info, 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._compute_partial_tokens(value))
-            elif key == 'place':
-                token_info.add_place(self._compute_partial_tokens(value))
-            elif not key.startswith('_') and \
-                 key not in ('country', 'full'):
-                addr_terms.append((key, self._compute_partial_tokens(value)))
-
-        if hnrs:
-            hnrs = self._split_housenumbers(hnrs)
-            token_info.add_housenumbers(self.conn, [self._make_standard_hnr(n) for n in hnrs])
-
-        if addr_terms:
-            token_info.add_address_terms(addr_terms)
-
-    def _compute_partial_tokens(self, name):
+        return token_info.to_dict()
+
+
+    def _process_place_address(self, token_info: '_TokenInfo',
+                               address: Sequence[PlaceName]) -> None:
+        for item in address:
+            if item.kind == 'postcode':
+                token_info.set_postcode(self._add_postcode(item))
+            elif item.kind == 'housenumber':
+                token_info.add_housenumber(*self._compute_housenumber_token(item))
+            elif item.kind == 'street':
+                token_info.add_street(self._retrieve_full_tokens(item.name))
+            elif item.kind == 'place':
+                if not item.suffix:
+                    token_info.add_place(self._compute_partial_tokens(item.name))
+            elif not item.kind.startswith('_') and not item.suffix and \
+                 item.kind not in ('country', 'full', 'inclusion'):
+                token_info.add_address_term(item.kind, self._compute_partial_tokens(item.name))
+
+
+    def _compute_housenumber_token(self, hnr: PlaceName) -> Tuple[Optional[int], Optional[str]]:
+        """ Normalize the housenumber and return the word token and the
+            canonical form.
+        """
+        assert self.conn is not None
+        analyzer = self.token_analysis.analysis.get('@housenumber')
+        result: Tuple[Optional[int], Optional[str]] = (None, None)
+
+        if analyzer is None:
+            # When no custom analyzer is set, simply normalize and transliterate
+            norm_name = self._search_normalized(hnr.name)
+            if norm_name:
+                result = self._cache.housenumbers.get(norm_name, result)
+                if result[0] is None:
+                    with self.conn.cursor() as cur:
+                        hid = cur.scalar("SELECT getorcreate_hnr_id(%s)", (norm_name, ))
+
+                        result = hid, norm_name
+                        self._cache.housenumbers[norm_name] = result
+        else:
+            # Otherwise use the analyzer to determine the canonical name.
+            # Per convention we use the first variant as the 'lookup name', the
+            # name that gets saved in the housenumber field of the place.
+            word_id = analyzer.get_canonical_id(hnr)
+            if word_id:
+                result = self._cache.housenumbers.get(word_id, result)
+                if result[0] is None:
+                    variants = analyzer.compute_variants(word_id)
+                    if variants:
+                        with self.conn.cursor() as cur:
+                            hid = cur.scalar("SELECT create_analyzed_hnr_id(%s, %s)",
+                                             (word_id, list(variants)))
+                            result = hid, variants[0]
+                            self._cache.housenumbers[word_id] = result
+
+        return result
+
+
+    def _compute_partial_tokens(self, name: str) -> List[int]:

         """ Normalize the given term, split it into partial words and return
             then token list for them.
         """
         """ Normalize the given term, split it into partial words and return
             then token list for them.
         """

-        norm_name = self.name_processor.get_search_normalized(name)
+        assert self.conn is not None
+        norm_name = self._search_normalized(name)

 
         tokens = []
         need_lookup = []
 
         tokens = []
         need_lookup = []


@@ -453,33 +624,65 @@ class LegacyICUNameAnalyzer(AbstractAnalyzer):
                             (need_lookup, ))
 
                 for partial, token in cur:
                             (need_lookup, ))
 
                 for partial, token in cur:

+                    assert token is not None

                     tokens.append(token)
                     self._cache.partials[partial] = token
 
         return tokens
 
                     tokens.append(token)
                     self._cache.partials[partial] = token
 
         return tokens
 

-    def _compute_name_tokens(self, names):
+
+    def _retrieve_full_tokens(self, name: str) -> List[int]:
+        """ Get the full name token for the given name, if it exists.
+            The name is only retrieved for the standard analyser.
+        """
+        assert self.conn is not None
+        norm_name = self._search_normalized(name)
+
+        # return cached if possible
+        if norm_name in self._cache.fulls:
+            return self._cache.fulls[norm_name]
+
+        with self.conn.cursor() as cur:
+            cur.execute("SELECT word_id FROM word WHERE word_token = %s and type = 'W'",
+                        (norm_name, ))
+            full = [row[0] for row in cur]
+
+        self._cache.fulls[norm_name] = full
+
+        return full
+
+
+    def _compute_name_tokens(self, names: Sequence[PlaceName]) -> Tuple[Set[int], Set[int]]:

         """ Computes the full name and partial name tokens for the given
             dictionary of names.
         """
         """ Computes the full name and partial name tokens for the given
             dictionary of names.
         """

-        full_names = self._compute_full_names(names)
-        full_tokens = set()
-        partial_tokens = set()
+        assert self.conn is not None
+        full_tokens: Set[int] = set()
+        partial_tokens: Set[int] = set()
+
+        for name in names:
+            analyzer_id = name.get_attr('analyzer')
+            analyzer = self.token_analysis.get_analyzer(analyzer_id)
+            word_id = analyzer.get_canonical_id(name)
+            if analyzer_id is None:
+                token_id = word_id
+            else:
+                token_id = f'{word_id}@{analyzer_id}'

 
 

-        for name in full_names:
-            norm_name = self.name_processor.get_normalized(name)
-            full, part = self._cache.names.get(norm_name, (None, None))
+            full, part = self._cache.names.get(token_id, (None, None))

             if full is None:
             if full is None:

-                variants = self.name_processor.get_variants_ascii(norm_name)
+                variants = analyzer.compute_variants(word_id)

                 if not variants:
                     continue
 
                 with self.conn.cursor() as cur:
                 if not variants:
                     continue
 
                 with self.conn.cursor() as cur:

-                    cur.execute("SELECT (getorcreate_full_word(%s, %s)).*",
-                                (norm_name, variants))
-                    full, part = cur.fetchone()
+                    cur.execute("SELECT * FROM getorcreate_full_word(%s, %s)",
+                                (token_id, variants))
+                    full, part = cast(Tuple[int, List[int]], cur.fetchone())
+
+                self._cache.names[token_id] = (full, part)

 
 

-                self._cache.names[norm_name] = (full, part)
+            assert part is not None

 
             full_tokens.add(full)
             partial_tokens.update(part)
 
             full_tokens.add(full)
             partial_tokens.update(part)


@@ -487,111 +690,125 @@ class LegacyICUNameAnalyzer(AbstractAnalyzer):
         return full_tokens, partial_tokens
 
 
         return full_tokens, partial_tokens
 
 

-    @staticmethod
-    def _compute_full_names(names):
-        """ Return the set of all full name word ids to be used with the
-            given dictionary of names.
+    def _add_postcode(self, item: PlaceName) -> Optional[str]:
+        """ Make sure the normalized postcode is present in the word table.

         """
         """

-        full_names = set()
-        for name in (n.strip() for ns in names.values() for n in re.split('[;,]', ns)):
-            if name:
-                full_names.add(name)
+        assert self.conn is not None
+        analyzer = self.token_analysis.analysis.get('@postcode')
+
+        if analyzer is None:
+            postcode_name = item.name.strip().upper()
+            variant_base = None
+        else:
+            postcode_name = analyzer.get_canonical_id(item)
+            variant_base = item.get_attr("variant")
+
+        if variant_base:
+            postcode = f'{postcode_name}@{variant_base}'
+        else:
+            postcode = postcode_name
+
+        if postcode not in self._cache.postcodes:
+            term = self._search_normalized(postcode_name)
+            if not term:
+                return None
+
+            variants = {term}
+            if analyzer is not None and variant_base:
+                variants.update(analyzer.compute_variants(variant_base))

 
 

-                brace_idx = name.find('(')
-                if brace_idx >= 0:
-                    full_names.add(name[:brace_idx].strip())
+            with self.conn.cursor() as cur:
+                cur.execute("SELECT create_postcode_word(%s, %s)",
+                            (postcode, list(variants)))
+            self._cache.postcodes.add(postcode)

 
 

-        return full_names
+        return postcode_name

 
 
 
 

-    def _add_postcode(self, postcode):
-        """ Make sure the normalized postcode is present in the word table.
-        """
-        if re.search(r'[:,;]', postcode) is None:
-            postcode = self.normalize_postcode(postcode)
+class _TokenInfo:
+    """ Collect token information to be sent back to the database.
+    """
+    def __init__(self) -> None:
+        self.names: Optional[str] = None
+        self.housenumbers: Set[str] = set()
+        self.housenumber_tokens: Set[int] = set()
+        self.street_tokens: Optional[Set[int]] = None
+        self.place_tokens: Set[int] = set()
+        self.address_tokens: Dict[str, str] = {}
+        self.postcode: Optional[str] = None

 
 

-            if postcode not in self._cache.postcodes:
-                term = self.name_processor.get_search_normalized(postcode)
-                if not term:
-                    return

 
 

-                with self.conn.cursor() as cur:
-                    # no word_id needed for postcodes
-                    cur.execute("""INSERT INTO word (word_token, type, word)
-                                   (SELECT %s, 'P', pc FROM (VALUES (%s)) as v(pc)
-                                    WHERE NOT EXISTS
-                                     (SELECT * FROM word
-                                      WHERE type = 'P' and word = pc))
-                                """, (term, postcode))
-                self._cache.postcodes.add(postcode)
-
-
-    @staticmethod
-    def _split_housenumbers(hnrs):
-        if len(hnrs) > 1 or ',' in hnrs[0] or ';' in hnrs[0]:
-            # 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:
-                hnrs = list(set(simple_list))
-            else:
-                hnrs = simple_list
+    def _mk_array(self, tokens: Iterable[Any]) -> str:
+        return f"{{{','.join((str(s) for s in tokens))}}}"

 
 

-        return hnrs

 
 

+    def to_dict(self) -> Dict[str, Any]:
+        """ Return the token information in database importable format.
+        """
+        out: Dict[str, Any] = {}

 
 

+        if self.names:
+            out['names'] = self.names

 
 

+        if self.housenumbers:
+            out['hnr'] = ';'.join(self.housenumbers)
+            out['hnr_tokens'] = self._mk_array(self.housenumber_tokens)

 
 

-class _TokenInfo:
-    """ Collect token information to be sent back to the database.
-    """
-    def __init__(self, cache):
-        self._cache = cache
-        self.data = {}
+        if self.street_tokens is not None:
+            out['street'] = self._mk_array(self.street_tokens)

 
 

-    @staticmethod
-    def _mk_array(tokens):
-        return '{%s}' % ','.join((str(s) for s in tokens))
+        if self.place_tokens:
+            out['place'] = self._mk_array(self.place_tokens)

 
 

+        if self.address_tokens:
+            out['addr'] = self.address_tokens

 
 

-    def add_names(self, fulls, partials):
+        if self.postcode:
+            out['postcode'] = self.postcode
+
+        return out
+
+
+    def set_names(self, fulls: Iterable[int], partials: Iterable[int]) -> None:

         """ Adds token information for the normalised names.
         """
         """ Adds token information for the normalised names.
         """

-        self.data['names'] = self._mk_array(itertools.chain(fulls, partials))
+        self.names = self._mk_array(itertools.chain(fulls, partials))

 
 
 
 

-    def add_housenumbers(self, conn, hnrs):
+    def add_housenumber(self, token: Optional[int], hnr: Optional[str]) -> None:

         """ Extract housenumber information from a list of normalised
             housenumbers.
         """
         """ Extract housenumber information from a list of normalised
             housenumbers.
         """

-        self.data['hnr_tokens'] = self._mk_array(self._cache.get_hnr_tokens(conn, hnrs))
-        self.data['hnr'] = ';'.join(hnrs)
+        if token:
+            assert hnr is not None
+            self.housenumbers.add(hnr)
+            self.housenumber_tokens.add(token)

 
 
 
 

-    def add_street(self, tokens):
+    def add_street(self, tokens: Iterable[int]) -> None:

         """ Add addr:street match terms.
         """
         """ Add addr:street match terms.
         """

-        if tokens:
-            self.data['street'] = self._mk_array(tokens)
+        if self.street_tokens is None:
+            self.street_tokens = set()
+        self.street_tokens.update(tokens)

 
 
 
 

-    def add_place(self, tokens):
+    def add_place(self, tokens: Iterable[int]) -> None:

         """ Add addr:place search and match terms.
         """
         """ Add addr:place search and match terms.
         """

-        if tokens:
-            self.data['place'] = self._mk_array(tokens)
+        self.place_tokens.update(tokens)

 
 
 
 

-    def add_address_terms(self, terms):
+    def add_address_term(self, key: str, partials: Iterable[int]) -> None:

         """ Add additional address terms.
         """
         """ Add additional address terms.
         """

-        tokens = {key: self._mk_array(partials)
-                  for key, partials in terms if partials}
+        if partials:
+            self.address_tokens[key] = self._mk_array(partials)

 
 

-        if tokens:
-            self.data['addr'] = tokens
+    def set_postcode(self, postcode: Optional[str]) -> None:
+        """ Set the postcode to the given one.
+        """
+        self.postcode = postcode

 
 
 class _TokenCache:
 
 
 class _TokenCache:


@@ -600,34 +817,9 @@ class _TokenCache:
         This cache is not thread-safe and needs to be instantiated per
         analyzer.
     """
         This cache is not thread-safe and needs to be instantiated per
         analyzer.
     """

-    def __init__(self):
-        self.names = {}
-        self.partials = {}
-        self.postcodes = set()
-        self.housenumbers = {}
-
-
-    def get_hnr_tokens(self, conn, terms):
-        """ Get token ids for a list of housenumbers, looking them up in the
-            database if necessary. `terms` is an iterable of normalized
-            housenumbers.
-        """
-        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
+    def __init__(self) -> None:
+        self.names: Dict[str, Tuple[int, List[int]]] = {}
+        self.partials: Dict[str, int] = {}
+        self.fulls: Dict[str, List[int]] = {}
+        self.postcodes: Set[str] = set()
+        self.housenumbers: Dict[str, Tuple[Optional[int], Optional[str]]] = {}