X-Git-Url: http://git.veekun.com/zzz-pokedex.git/blobdiff_plain/7323dd76007f16915391386822a7bd8a3a58ebab..3651c1bfcb285efe2931715e75d980e4f2da8d01:/pokedex/lookup.py diff --git a/pokedex/lookup.py b/pokedex/lookup.py index b00f5a7..98e69c4 100644 --- a/pokedex/lookup.py +++ b/pokedex/lookup.py @@ -1,5 +1,4 @@ # encoding: utf8 -from collections import namedtuple import os, os.path import random import re @@ -15,6 +14,8 @@ from whoosh.qparser import QueryParser import whoosh.scoring import whoosh.spelling +from pokedex.util import namedtuple + from pokedex.db import connect import pokedex.db.tables as tables from pokedex.roomaji import romanize @@ -25,8 +26,9 @@ __all__ = ['PokedexLookup'] rx_is_number = re.compile('^\d+$') -LookupResult = namedtuple('LookupResult', - ['object', 'indexed_name', 'name', 'language', 'iso3166', 'exact']) +LookupResult = namedtuple('LookupResult', [ + 'object', 'indexed_name', 'name', 'language', 'iso639', 'iso3166', 'exact', +]) class UninitializedIndex(object): class UninitializedIndexError(Exception): @@ -51,22 +53,44 @@ class LanguageWeighting(whoosh.scoring.Weighting): before foreign results. """ + def __init__(self, extra_weights={}, *args, **kwargs): + """`extra_weights` may be a dictionary of weights which will be + factored in. + + Intended for use with spelling corrections, which come along with their + own weightings. + """ + self.extra_weights = extra_weights + super(LanguageWeighting, self).__init__(*args, **kwargs) + def score(self, searcher, fieldnum, text, docnum, weight, QTF=1): doc = searcher.stored_fields(docnum) - if doc['language'] == None: + + # Apply extra weight + weight = weight * self.extra_weights.get(text, 1.0) + + language = doc.get('language') + if language is None: # English (well, "default"); leave it at 1 return weight - elif doc['language'] == u'Roomaji': + elif language == u'Roomaji': # Give Roomaji a little boost; it's most likely to be searched - return weight * 0.95 + return weight * 0.9 else: # Everything else can drop down the totem pole - return weight * 0.9 + return weight * 0.8 class PokedexLookup(object): - INTERMEDIATE_LOOKUP_RESULTS = 25 - MAX_LOOKUP_RESULTS = 10 + MAX_FUZZY_RESULTS = 10 + MAX_EXACT_RESULTS = 43 + INTERMEDIATE_FACTOR = 2 + + # The speller only checks how much the input matches a word; there can be + # all manner of extra unmatched junk, and it won't affect the weighting. + # To compensate, greatly boost the weighting of matches at the beginning + # and end, so nearly-full-word-matches are much better + SPELLER_OPTIONS = dict(booststart=10.0, boostend=9.0) # Dictionary of table name => table class. # Need the table name so we can get the class from the table name after we @@ -135,7 +159,8 @@ class PokedexLookup(object): # Create speller, and done spell_store = whoosh.filedb.filestore.FileStorage(directory) - self.speller = whoosh.spelling.SpellChecker(spell_store) + self.speller = whoosh.spelling.SpellChecker(spell_store, + **self.SPELLER_OPTIONS) def rebuild_index(self): @@ -146,11 +171,18 @@ class PokedexLookup(object): table=whoosh.fields.ID(stored=True), row_id=whoosh.fields.ID(stored=True), language=whoosh.fields.STORED, - iso3166=whoosh.fields.STORED, + iso639=whoosh.fields.ID(stored=True), + iso3166=whoosh.fields.ID(stored=True), display_name=whoosh.fields.STORED, # non-lowercased name ) - if not os.path.exists(self.directory): + if os.path.exists(self.directory): + # create_in() isn't totally reliable, so just nuke whatever's there + # manually. Try to be careful about this... + for f in os.listdir(self.directory): + if re.match('^_?(MAIN|SPELL)_', f): + os.remove(os.path.join(self.directory, f)) + else: os.mkdir(self.directory) self.index = whoosh.index.create_in(self.directory, schema=schema, @@ -158,11 +190,7 @@ class PokedexLookup(object): writer = self.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 = [] + speller_entries = set() for cls in self.indexed_tables.values(): q = self.session.query(cls) @@ -170,30 +198,30 @@ class PokedexLookup(object): row_key = dict(table=unicode(cls.__tablename__), row_id=unicode(row.id)) - def add(name, language, iso3166, score): + def add(name, language, iso639, iso3166): normalized_name = self.normalize_name(name) writer.add_document( name=normalized_name, display_name=name, - language=language, iso3166=iso3166, + language=language, iso639=iso639, iso3166=iso3166, **row_key ) - speller_entries.append((normalized_name, score)) + speller_entries.add(normalized_name) # Add the basic English name to the index if cls == tables.Pokemon: # Pokémon need their form name added # XXX kinda kludgy - add(row.full_name, None, u'us', 1) + add(row.full_name, None, u'en', u'us') # If this is a default form, ALSO add the unadorned name, # so 'Deoxys' alone will still do the right thing if row.forme_name and not row.forme_base_pokemon_id: - add(row.name, None, u'us', 1) + add(row.name, None, u'en', u'us') else: - add(row.name, None, u'us', 1) + add(row.name, None, u'en', u'us') # Some things also have other languages' names # XXX other language form names..? @@ -206,21 +234,22 @@ class PokedexLookup(object): continue add(moonspeak, foreign_name.language.name, - foreign_name.language.iso3166, - 3) + foreign_name.language.iso639, + foreign_name.language.iso3166) # Add Roomaji too if foreign_name.language.name == 'Japanese': roomaji = romanize(foreign_name.name) - add(roomaji, u'Roomaji', u'jp', 8) + add(roomaji, u'Roomaji', u'ja', u'jp') 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 - self.speller = whoosh.spelling.SpellChecker(self.index.storage) - self.speller.add_scored_words(speller_entries) + self.speller = whoosh.spelling.SpellChecker(self.index.storage, mingram=2, + **self.SPELLER_OPTIONS) + self.speller.add_words(speller_entries) def normalize_name(self, name): @@ -267,41 +296,62 @@ class PokedexLookup(object): name = name.strip() prefixes = prefix_chunk.split(',') - user_valid_types = [_.strip() for _ in prefixes] + user_valid_types = [] + for prefix in prefixes: + prefix = prefix.strip() + if prefix: + user_valid_types.append(prefix) # Merge the valid types together. Only types that appear in BOTH lists # may be used. # As a special case, if the user asked for types that are explicitly - # forbidden, completely ignore what the user requested - combined_valid_types = [] - if user_valid_types and valid_types: - combined_valid_types = list( - set(user_valid_types) & set(combined_valid_types) - ) - - if not combined_valid_types: - # No overlap! Just use the enforced ones - combined_valid_types = valid_types - else: - # One list or the other was blank, so just use the one that isn't - combined_valid_types = valid_types + user_valid_types + # forbidden, completely ignore what the user requested. + # And, just to complicate matters: "type" and language need to be + # considered separately. + def merge_requirements(func): + user = filter(func, user_valid_types) + system = filter(func, valid_types) + + if user and system: + merged = list(set(user) & set(system)) + if merged: + return merged + else: + # No overlap; use the system restrictions + return system + else: + # One or the other is blank; use the one that's not + return user or system - if not combined_valid_types: - # No restrictions - return name, [], None + # @foo means language must be foo; otherwise it's a table name + lang_requirements = merge_requirements(lambda req: req[0] == u'@') + type_requirements = merge_requirements(lambda req: req[0] != u'@') + all_requirements = lang_requirements + type_requirements # Construct the term + lang_terms = [] + for lang in lang_requirements: + # Allow for either country or language codes + lang_code = lang[1:] + lang_terms.append(whoosh.query.Term(u'iso639', lang_code)) + lang_terms.append(whoosh.query.Term(u'iso3166', lang_code)) + type_terms = [] - final_valid_types = [] - for valid_type in combined_valid_types: - table_name = self._parse_table_name(valid_type) + for type in type_requirements: + table_name = self._parse_table_name(type) # Quietly ignore bogus valid_types; more likely to DTRT if table_name: - final_valid_types.append(valid_type) type_terms.append(whoosh.query.Term(u'table', table_name)) - return name, final_valid_types, whoosh.query.Or(type_terms) + # Combine both kinds of restriction + all_terms = [] + if type_terms: + all_terms.append(whoosh.query.Or(type_terms)) + if lang_terms: + all_terms.append(whoosh.query.Or(lang_terms)) + + return name, all_requirements, whoosh.query.And(all_terms) def _parse_table_name(self, name): @@ -343,7 +393,8 @@ class PokedexLookup(object): results.append(LookupResult(object=obj, indexed_name=record['name'], name=record['display_name'], - language=record['language'], + language=record.get('language'), + iso639=record['iso639'], iso3166=record['iso3166'], exact=exact)) @@ -353,12 +404,11 @@ class PokedexLookup(object): def lookup(self, input, valid_types=[], exact_only=False): """Attempts to find some sort of object, given a name. - Returns a list of named (object, name, language, iso3166, exact) - tuples. `object` is a database object, `name` is the name under which - the object was found, `language` and `iso3166` are the name and country - code of the language in which the name was found, and `exact` is True - iff this was an - exact match. + Returns a list of named (object, name, language, iso639, iso3166, + exact) tuples. `object` is a database object, `name` is the name under + which the object was found, `language` and the two isos are the name + and country codes of the language in which the name was found, and + `exact` is True iff this was an exact match. This function currently ONLY does fuzzy matching if there are no exact matches. @@ -376,17 +426,19 @@ class PokedexLookup(object): Also: - Type restrictions. "type:psychic" will only return the type. This is how to make ID lookup useful. Multiple type specs can be entered - with commas, as "move,item:1". If `valid_types` are provided, any - type prefix will be ignored. + with commas, as "move,item:1". + - Language restrictions. "@fr:charge" will only return Tackle, which + is called "Charge" in French. These can be combined with type + restrictions, e.g., "@fr,move:charge". - Alternate formes can be specified merely like "wash rotom". `input` Name of the thing to look for. `valid_types` - A list of table objects or names, e.g., `['pokemon', 'moves']`. If - this is provided, only results in one of the given tables will be - returned. + A list of type or language restrictions, e.g., `['pokemon', + '@ja']`. If this is provided, only results in one of the given + tables will be returned. `exact_only` If True, only exact matches are returned. If set to False (the @@ -432,33 +484,62 @@ class PokedexLookup(object): ### Actual searching - searcher = self.index.searcher() - # XXX is this kosher? docs say search() takes a weighting arg, but it - # certainly does not - searcher.weighting = LanguageWeighting() - results = searcher.search(query, - limit=self.INTERMEDIATE_LOOKUP_RESULTS) + # Limits; result limits are constants, and intermediate results (before + # duplicate items are stripped out) are capped at the result limit + # times another constant. + # Fuzzy are capped at 10, beyond which something is probably very + # wrong. Exact matches -- that is, wildcards and ids -- are far less + # constrained. + # Also, exact matches are sorted by name, since weight doesn't matter. + sort_by = dict() + if exact_only: + max_results = self.MAX_EXACT_RESULTS + sort_by['sortedby'] = (u'table', u'name') + else: + max_results = self.MAX_FUZZY_RESULTS + + searcher = self.index.searcher(weighting=LanguageWeighting()) + results = searcher.search( + query, + limit=int(max_results * self.INTERMEDIATE_FACTOR), + **sort_by + ) # Look for some fuzzy matches if necessary if not exact_only and not results: exact = False results = [] - for suggestion in self.speller.suggest( - name, self.INTERMEDIATE_LOOKUP_RESULTS): + fuzzy_query_parts = [] + fuzzy_weights = {} + min_weight = [None] + for suggestion, _, weight in self.speller.suggestions_and_scores(name): + # Only allow the top 50% of scores; otherwise there will always + # be a lot of trailing junk + if min_weight[0] is None: + min_weight[0] = weight * 0.5 + elif weight < min_weight[0]: + break + + fuzzy_query_parts.append(whoosh.query.Term('name', suggestion)) + fuzzy_weights[suggestion] = weight + + if not fuzzy_query_parts: + # Nothing at all; don't try querying + return [] + + fuzzy_query = whoosh.query.Or(fuzzy_query_parts) + if type_term: + fuzzy_query = fuzzy_query & type_term - query = whoosh.query.Term('name', suggestion) - results.extend(searcher.search(query)) + searcher.weighting = LanguageWeighting(extra_weights=fuzzy_weights) + results = searcher.search(fuzzy_query) ### Convert results to db objects objects = self._whoosh_records_to_results(results, exact=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[:self.MAX_LOOKUP_RESULTS] + # Truncate and return + return objects[:max_results] def random_lookup(self, valid_types=[]): @@ -466,17 +547,18 @@ class PokedexLookup(object): `valid_types`. """ - tables = [] + table_names = [] for valid_type in valid_types: table_name = self._parse_table_name(valid_type) + # Skip anything not recognized. Could be, say, a language code if table_name: - tables.append(self.indexed_tables[table_name]) + table_names.append(table_name) - if not tables: + if not table_names: # n.b.: It's possible we got a list of valid_types and none of them # were valid, but this function is guaranteed to return - # *something*, so it politely selects from the entire index isntead - tables = self.indexed_tables.values() + # *something*, so it politely selects from the entire index instead + table_names = self.indexed_tables.keys() # Rather than create an array of many hundred items and pick randomly # from it, just pick a number up to the total number of potential @@ -486,10 +568,10 @@ class PokedexLookup(object): # XXX ought to cache this (in the index?) if possible total = 0 partitions = [] - for table in tables: - count = self.session.query(table).count() + for table_name in table_names: + count = self.session.query(self.indexed_tables[table_name]).count() total += count - partitions.append((table, count)) + partitions.append((table_name, count)) n = random.randint(1, total) while n > partitions[0][1]: