# encoding: utf8
+from collections import namedtuple
+import os, os.path
+import pkg_resources
+import re
+
from sqlalchemy.sql import func
+import whoosh
+import whoosh.filedb.filestore
+import whoosh.filedb.fileindex
+import whoosh.index
+from whoosh.qparser import QueryParser
+import whoosh.spelling
+from pokedex.db import connect
import pokedex.db.tables as tables
+from pokedex.roomaji import romanize
+
+# Dictionary of table name => table class.
+# Need the table name so we can get the class from the table name after we
+# retrieve something from the index
+indexed_tables = {}
+for cls in [
+ tables.Ability,
+ tables.Item,
+ tables.Move,
+ tables.Pokemon,
+ tables.Type,
+ ]:
+ indexed_tables[cls.__tablename__] = cls
+
+def open_index(directory=None, session=None, recreate=False):
+ """Opens the whoosh index stored in the named directory and returns (index,
+ speller). If the index doesn't already exist, it will be created.
+
+ `directory`
+ Directory containing the index. Defaults to a location within the
+ `pokedex` egg directory.
+
+ `session`
+ If the index needs to be created, this database session will be used.
+ Defaults to an attempt to connect to the default SQLite database
+ installed by `pokedex setup`.
+
+ `recreate`
+ If set to True, the whoosh index will be created even if it already
+ exists.
+ """
+
+ # Defaults
+ if not directory:
+ directory = pkg_resources.resource_filename('pokedex',
+ 'data/whoosh_index')
+
+ if not session:
+ session = connect()
+
+ # Attempt to open or create the index
+ directory_exists = os.path.exists(directory)
+ if directory_exists and not recreate:
+ # Already exists; should be an index!
+ try:
+ index = whoosh.index.open_dir(directory, indexname='MAIN')
+ spell_store = whoosh.filedb.filestore.FileStorage(directory)
+ speller = whoosh.spelling.SpellChecker(spell_store)
+ return index, speller
+ except whoosh.index.EmptyIndexError as e:
+ # Apparently not a real index. Fall out of the if and create it
+ pass
+
+ if not directory_exists:
+ os.mkdir(directory)
+
+
+ # Create index
+ schema = whoosh.fields.Schema(
+ name=whoosh.fields.ID(stored=True),
+ table=whoosh.fields.STORED,
+ row_id=whoosh.fields.ID(stored=True),
+ language=whoosh.fields.STORED,
+ )
+
+ index = whoosh.index.create_in(directory, schema=schema, indexname='MAIN')
+ writer = index.writer()
+
+ # Index every name in all our tables of interest
+ # speller_entries becomes a list of (word, score) tuples; the score is 2
+ # for English names, 1.5 for Roomaji, and 1 for everything else. I think
+ # this biases the results in the direction most people expect, especially
+ # when e.g. German names are very similar to English names
+ speller_entries = []
+ for cls in indexed_tables.values():
+ q = session.query(cls)
+
+ # Only index base Pokémon formes
+ if hasattr(cls, 'forme_base_pokemon_id'):
+ q = q.filter_by(forme_base_pokemon_id=None)
+
+ for row in q.yield_per(5):
+ row_key = dict(table=cls.__tablename__, row_id=unicode(row.id))
+
+ name = row.name.lower()
+ writer.add_document(name=name, **row_key)
+ speller_entries.append((name, 1))
+
+ # Pokemon also get other languages
+ for foreign_name in getattr(row, 'foreign_names', []):
+ moonspeak = foreign_name.name.lower()
+ if name == moonspeak:
+ # Don't add the English name again as a different language;
+ # no point and it makes spell results confusing
+ continue
+
+ writer.add_document(name=moonspeak,
+ language=foreign_name.language.name,
+ **row_key)
+ speller_entries.append((moonspeak, 3))
-def lookup(session, name):
+ # Add Roomaji too
+ if foreign_name.language.name == 'Japanese':
+ roomaji = romanize(foreign_name.name).lower()
+ writer.add_document(name=roomaji, language='Roomaji',
+ **row_key)
+ speller_entries.append((roomaji, 8))
+
+
+ writer.commit()
+
+ # Construct and populate a spell-checker index. Quicker to do it all
+ # at once, as every call to add_* does a commit(), and those seem to be
+ # expensive
+ speller = whoosh.spelling.SpellChecker(index.storage)
+ speller.add_scored_words(speller_entries)
+
+ return index, speller
+
+
+rx_is_number = re.compile('^\d+$')
+
+LookupResult = namedtuple('LookupResult',
+ ['object', 'name', 'language', 'exact'])
+def lookup(input, session=None, indices=None, exact_only=False):
"""Attempts to find some sort of object, given a database session and name.
- Returns a list of (object, matchiness) tuples. Matchiness is 1 for exact
- matches. It is possible to get multiple exact matches; for example,
- 'Metronome' will match both the move and the item. In these cases, the
- results are returned in rough order of "importance", e.g., Pokémon come
- before moves come before types.
+ Returns a list of named (object, name, language, exact) tuples. `object`
+ is a database object, `name` is the name under which the object was found,
+ `language` is the name of the language in which the name was found, and
+ `exact` is True iff this was an exact match.
- This function does fuzzy matching iff there are no exact matches.
+ This function currently ONLY does fuzzy matching if there are no exact
+ matches.
Formes are not returned; "Shaymin" will return only grass Shaymin.
-
- Currently recognizes:
- - Pokémon names: "Eevee"
+
+ Recognizes:
+ - Names: "Eevee", "Surf", "Run Away", "Payapa Berry", etc.
+ - Foreign names: "Iibui", "Eivui"
+ - Fuzzy names in whatever language: "Evee", "Ibui"
+ - IDs: "pokemon 133", "move 192", "item 250"
+ - Dex numbers: "sinnoh 55", "133", "johto 180"
+
+ `input`
+ Name of the thing to look for.
+
+ `session`
+ A database session to use for retrieving objects. As with get_index,
+ if this is not provided, a connection to the default database will be
+ attempted.
+
+ `indices`
+ Tuple of index, speller as returned from `open_index()`. Defaults to
+ a call to `open_index()`.
+
+ `exact_only`
+ If True, only exact matches are returned. If set to False (the
+ default), and the provided `name` doesn't match anything exactly,
+ spelling correction will be attempted.
"""
- q = session.query(tables.Pokemon) \
- .filter(func.lower(tables.Pokemon.name) == name.lower()) \
- .filter_by(forme_base_pokemon_id=None)
+ if not session:
+ session = connect()
+
+ if indices:
+ index, speller = indices
+ else:
+ index, speller = open_index()
+
+ name = unicode(input).lower()
+ exact = True
+
+ # If the input provided is a number, match it as an id. Otherwise, name
+ if rx_is_number.match(input):
+ query_column = 'row_id'
+ exact_only = True # don't spell-check numbers!
+ else:
+ # Not an integer
+ query_column = 'name'
+
+ # Look for exact name. A Term object does an exact match, so we don't have
+ # to worry about a query parser tripping on weird characters in the input
+ searcher = index.searcher()
+ query = whoosh.query.Term(query_column, name)
+ print query
+ results = searcher.search(query)
+
+ # Look for some fuzzy matches if necessary
+ if not exact_only and not results:
+ exact = False
+ results = []
+
+ for suggestion in speller.suggest(name, 25):
+ query = whoosh.query.Term('name', suggestion)
+ results.extend(searcher.search(query))
+
+ ### Convert results to db objects
+ objects = []
+ seen = {}
+ for result in results:
+ # Skip dupe results
+ # Note! The speller prefers English names, but the query does not. So
+ # "latias" comes over "ratiasu". "latias" matches only the English
+ # row, comes out first, and all is well.
+ # However! The speller could then return "foo" which happens to be the
+ # name for two different things in different languages, and the
+ # non-English one could appear preferred. This is not very likely.
+ seen_key = result['table'], result['row_id']
+ if seen_key in seen:
+ continue
+ seen[seen_key] = True
+
+ cls = indexed_tables[result['table']]
+ obj = session.query(cls).get(result['row_id'])
+ objects.append(LookupResult(object=obj,
+ name=result['name'],
+ language=result['language'],
+ exact=exact))
- try:
- result = q.one()
- return [ (result, 1) ]
- except:
- return []
+ # Only return up to 10 matches; beyond that, something is wrong.
+ # We strip out duplicate entries above, so it's remotely possible that we
+ # should have more than 10 here and lost a few. The speller returns 25 to
+ # give us some padding, and should avoid that problem. Not a big deal if
+ # we lose the 25th-most-likely match anyway.
+ return objects[:10]
projects / zzz-pokedex.git / blobdiff