# 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.scoring
import whoosh.spelling
+from pokedex.db import connect
import pokedex.db.tables as tables
+from pokedex.roomaji import romanize
+
+__all__ = ['open_index', 'lookup']
# 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
-index_bits = {}
-def get_index(session):
- """Returns (index, speller).
+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.
- Creates an index if one does not exist.
+ `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.
"""
- if index_bits:
- return index_bits['index'], index_bits['speller']
+ # 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)
+
- store = whoosh.store.RamStorage()
+ # Create index
schema = whoosh.fields.Schema(
name=whoosh.fields.ID(stored=True),
- spelling_name=whoosh.fields.ID(stored=True),
table=whoosh.fields.STORED,
- row_id=whoosh.fields.STORED,
- language_id=whoosh.fields.STORED,
+ row_id=whoosh.fields.ID(stored=True),
+ language=whoosh.fields.STORED,
)
- index = whoosh.index.Index(store, schema=schema, create=True)
+ 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)
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()
- spelling_name = re.sub('[^a-z]', '', name)
- writer.add_document(name=name,
- spelling_name=spelling_name,
- table=cls.__tablename__,
- row_id=row.id)
+ 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))
+
+ # 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 a spell-checker index
+ # 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
- # Can't use speller.add_field because it tries to intuit a frequency, and
- # names are in an ID field, which seems to be immune to frequency.
- # Not hard to add everything ourselves, though
- reader = index.doc_reader()
- speller.add_words([ _['spelling_name'] for _ in reader ])
- reader.close()
- index_bits['index'] = index
- index_bits['speller'] = speller
- index_bits['store'] = store
- return index_bits['index'], index_bits['speller']
+class LanguageWeighting(whoosh.scoring.Weighting):
+ """A scoring class that forces otherwise-equal English results to come
+ before foreign results.
+ """
+
+ def score(self, searcher, fieldnum, text, docnum, weight, QTF=1):
+ doc = searcher.stored_fields(docnum)
+ if doc['language'] == None:
+ # English (well, "default"); leave it at 1
+ return weight
+ elif doc['language'] == u'Roomaji':
+ # Give Roomaji a bit of a boost, as it's most likely to be searched
+ return weight * 0.95
+ else:
+ # Everything else can drop down the totem pole
+ return weight * 0.9
-def lookup(session, name, exact_only=False):
+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 (objects, exact) where `objects` is a list of database objects, and
- `exact` is True iff the given name matched the returned objects exactly.
+ 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 ONLY does fuzzy matching if 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.
"""
+ if not session:
+ session = connect()
+
+ if indices:
+ index, speller = indices
+ else:
+ index, speller = open_index()
+
+ name = unicode(input).lower()
exact = True
- # Alas! We have to make three attempts to find anything with this index.
- # First: Try an exact match for a name in the index.
- # Second: Try an exact match for a stripped-down name in the index.
- # Third: Get spelling suggestions.
- # The spelling module apparently only indexes *words* -- that is, [a-z]+.
- # So we have a separate field that contains the same name, stripped down to
- # just [a-z]+.
- # Unfortunately, exact matches aren't returned as spelling suggestions, so
- # we also have to do a regular index match against this separate field.
- # Otherwise, 'nidoran' will never match anything
- index, speller = get_index(session)
-
- # Look for exact name
- parser = QueryParser('name', schema=index.schema)
- results = index.find(name.lower(), parser=parser)
-
- if not exact_only:
- # Look for a match with a reduced a-z name
- if not results:
- parser = QueryParser('spelling_name', schema=index.schema)
- results = index.find(name.lower(), parser=parser)
-
- # Look for some fuzzy matches
- if not results:
- results = []
- exact = False
-
- for suggestion in speller.suggest(name, 3):
- results.extend( index.find(suggestion, parser=parser) )
-
- # Convert results to db objects
+ # If the input provided is a number, match it as an id. Otherwise, name.
+ # Term objects do an exact match, so we don't have to worry about a query
+ # parser tripping on weird characters in the input
+ if rx_is_number.match(name):
+ # Don't spell-check numbers!
+ exact_only = True
+ query = whoosh.query.Term(u'row_id', name)
+ else:
+ # Not an integer
+ query = whoosh.query.Term(u'name', name)
+
+ ### Actual searching
+ searcher = index.searcher()
+ searcher.weighting = LanguageWeighting() # XXX kosher? docs say search()
+ # takes a weighting kw but it
+ # certainly does not
+ 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:
cls = indexed_tables[result['table']]
obj = session.query(cls).get(result['row_id'])
- objects.append(obj)
+ objects.append(LookupResult(object=obj,
+ name=result['name'],
+ language=result['language'],
+ exact=exact))
- return objects, exact
+ # 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