split code into submodules

src/nominatim_db/clicmd/special_phrases.py

@@ -0,0 +1,93 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+#
+# This file is part of Nominatim. (https://nominatim.org)
+#
+# Copyright (C) 2024 by the Nominatim developer community.
+# For a full list of authors see the git log.
+"""
+    Implementation of the 'special-phrases' command.
+"""
+import argparse
+import logging
+from pathlib import Path
+
+from nominatim_core.errors import UsageError
+from nominatim_core.db.connection import connect
+from ..tools.special_phrases.sp_importer import SPImporter, SpecialPhraseLoader
+from ..tools.special_phrases.sp_wiki_loader import SPWikiLoader
+from ..tools.special_phrases.sp_csv_loader import SPCsvLoader
+from .args import NominatimArgs
+
+LOG = logging.getLogger()
+
+# Do not repeat documentation of subcommand classes.
+# pylint: disable=C0111
+# Using non-top-level imports to avoid eventually unused imports.
+# pylint: disable=E0012,C0415
+
+class ImportSpecialPhrases:
+    """\
+    Import special phrases.
+
+    Special phrases are search terms that narrow down the type of object
+    that should be searched. For example, you might want to search for
+    'Hotels in Barcelona'. The OSM wiki has a selection of special phrases
+    in many languages, which can be imported with this command.
+
+    You can also provide your own phrases in a CSV file. The file needs to have
+    the following five columns:
+     * phrase - the term expected for searching
+     * class - the OSM tag key of the object type
+     * type - the OSM tag value of the object type
+     * operator - the kind of search to be done (one of: in, near, name, -)
+     * plural - whether the term is a plural or not (Y/N)
+
+    An example file can be found in the Nominatim sources at
+    'test/testdb/full_en_phrases_test.csv'.
+
+    The import can be further configured to ignore specific key/value pairs.
+    This is particularly useful when importing phrases from the wiki. The
+    default configuration excludes some very common tags like building=yes.
+    The configuration can be customized by putting a file `phrase-settings.json`
+    with custom rules into the project directory or by using the `--config`
+    option to point to another configuration file.
+    """
+
+    def add_args(self, parser: argparse.ArgumentParser) -> None:
+        group = parser.add_argument_group('Input arguments')
+        group.add_argument('--import-from-wiki', action='store_true',
+                           help='Import special phrases from the OSM wiki to the database')
+        group.add_argument('--import-from-csv', metavar='FILE',
+                           help='Import special phrases from a CSV file')
+        group.add_argument('--no-replace', action='store_true',
+                           help='Keep the old phrases and only add the new ones')
+
+
+    def run(self, args: NominatimArgs) -> int:
+
+        if args.import_from_wiki:
+            self.start_import(args, SPWikiLoader(args.config))
+
+        if args.import_from_csv:
+            if not Path(args.import_from_csv).is_file():
+                LOG.fatal("CSV file '%s' does not exist.", args.import_from_csv)
+                raise UsageError('Cannot access file.')
+
+            self.start_import(args, SPCsvLoader(args.import_from_csv))
+
+        return 0
+
+
+    def start_import(self, args: NominatimArgs, loader: SpecialPhraseLoader) -> None:
+        """
+            Create the SPImporter object containing the right
+            sp loader and then start the import of special phrases.
+        """
+        from ..tokenizer import factory as tokenizer_factory
+
+        tokenizer = tokenizer_factory.get_tokenizer_for_db(args.config)
+        should_replace = not args.no_replace
+        with connect(args.config.get_libpq_dsn()) as db_connection:
+            SPImporter(
+                args.config, db_connection, loader
+            ).import_phrases(tokenizer, should_replace)