From 706d0f3ea899d26403b412545d60877996e81994 Mon Sep 17 00:00:00 2001 From: Eevee Date: Mon, 19 Apr 2010 00:33:09 -0700 Subject: [PATCH] Refactored valid-type handling in lookup. - User-specified types are now merged with code-enforced ones, rather than being blindly clobbered. - Prefix lookup now supports type prefixes. --- pokedex/lookup.py | 97 +++++++++++++++++++++++++++++++++++++++++-------------- 1 file changed, 73 insertions(+), 24 deletions(-) diff --git a/pokedex/lookup.py b/pokedex/lookup.py index 9e2ead6..115e9f0 100644 --- a/pokedex/lookup.py +++ b/pokedex/lookup.py @@ -226,6 +226,64 @@ class PokedexLookup(object): return name + def _apply_valid_types(self, name, valid_types): + """Combines the enforced `valid_types` with any from the search string + itself and updates the query. + + For example, a name of 'a,b:foo' and valid_types of b,c will search for + only `b`s named "foo". + + Returns `(name, merged_valid_types, term)`, where `name` has had any type + prefix stripped, `merged_valid_types` combines the original + `valid_types` with the type prefix, and `term` is a query term for + limited to just the allowed types. If there are no type restrictions + at all, `term` will be None. + """ + + # Remove any type prefix (pokemon:133) first + user_valid_types = [] + if ':' in name: + prefix_chunk, name = name.split(':', 1) + name = name.strip() + + prefixes = prefix_chunk.split(',') + user_valid_types = [_.strip() for _ in prefixes] + + # 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 + + if not combined_valid_types: + # No restrictions + return name, [], None + + # Construct the term + type_terms = [] + final_valid_types = [] + for valid_type in combined_valid_types: + table_name = self._parse_table_name(valid_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) + + def _parse_table_name(self, name): """Takes a singular table name, table name, or table object and returns the table name. @@ -318,20 +376,13 @@ class PokedexLookup(object): exact = True form = None - # Remove any type prefix (pokemon:133) before constructing a query - if ':' in name: - prefix_chunk, name = name.split(':', 1) - name = name.strip() - - if not valid_types: - # Only use types from the query string if none were explicitly - # provided - prefixes = prefix_chunk.split(',') - valid_types = [_.strip() for _ in prefixes] + # Pop off any type prefix and merge with valid_types + name, merged_valid_types, type_term = \ + self._apply_valid_types(name, valid_types) # Random lookup if name == 'random': - return self.random_lookup(valid_types=valid_types) + return self.random_lookup(valid_types=merged_valid_types) # Do different things depending what the query looks like # Note: Term objects do an exact match, so we don't have to worry about @@ -347,16 +398,8 @@ class PokedexLookup(object): # Not an integer query = whoosh.query.Term(u'name', name) - ### Filter by type of object - type_terms = [] - for valid_type in valid_types: - table_name = self._parse_table_name(valid_type) - if table_name: - # Quietly ignore bogus valid_types; more likely to DTRT - type_terms.append(whoosh.query.Term(u'table', table_name)) - - if type_terms: - query = query & whoosh.query.Or(type_terms) + if type_term: + query = query & type_term ### Actual searching @@ -426,15 +469,21 @@ class PokedexLookup(object): return self.lookup(unicode(n), valid_types=[ partitions[0][0] ]) - def prefix_lookup(self, prefix): + def prefix_lookup(self, prefix, valid_types=[]): """Returns terms starting with the given exact prefix. - No special magic is currently done with the name; type prefixes are not - recognized. + Type prefixes are recognized, but no other name munging is done. """ + # Pop off any type prefix and merge with valid_types + prefix, merged_valid_types, type_term = \ + self._apply_valid_types(prefix, valid_types) + query = whoosh.query.Prefix(u'name', self.normalize_name(prefix)) + if type_term: + query = query & type_term + searcher = self.index.searcher() searcher.weighting = LanguageWeighting() results = searcher.search(query) # XXX , limit=self.MAX_LOOKUP_RESULTS) -- 2.7.4