web/views/magicsearch.py
author sylvain.thenault@logilab.fr
Wed, 15 Apr 2009 17:30:03 +0200
branchtls-sprint
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parent 1172 959b0e177660
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"""a query preprocesser to handle quick search shortcuts for cubicweb
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:organization: Logilab
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99d0b471cc0c update import
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:copyright: 2001-2009 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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"""
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__docformat__ = "restructuredtext en"
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import re
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from logging import getLogger
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from rql import RQLSyntaxError, BadRQLQuery, parse
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from rql.nodes import Relation
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from cubicweb import Unauthorized
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from cubicweb.view import Component
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LOGGER = getLogger('cubicweb.magicsearch')
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def _get_approriate_translation(translations_found, eschema):
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    """return the first (should be the only one) possible translation according
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    to the given entity type
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    """
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    # get the list of all attributes / relations for this kind of entity
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    existing_relations = set(eschema.subject_relations())
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    consistent_translations = translations_found & existing_relations
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    if len(consistent_translations) == 0:
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        return None
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    return consistent_translations.pop()
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def translate_rql_tree(rqlst, translations, schema):
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    """Try to translate each relation in the RQL syntax tree
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    :type rqlst: `rql.stmts.Statement`
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    :param rqlst: the RQL syntax tree
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    :type translations: dict
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    :param translations: the reverted l10n dict
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    :type schema: `cubicweb.schema.Schema`
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    :param schema: the application's schema    
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    """
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    # var_types is used as a map : var_name / var_type
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    vartypes = {}
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    # ambiguous_nodes is used as a map : relation_node / (var_name, available_translations)
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    ambiguous_nodes = {}
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    # For each relation node, check if it's a localized relation name
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    # If it's a localized name, then use the original relation name, else
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    # keep the existing relation name
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    for relation in rqlst.get_nodes(Relation):
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        rtype = relation.r_type
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        lhs, rhs = relation.get_variable_parts()
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        if rtype == 'is':
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            try:
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                etype = translations[rhs.value]
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                rhs.value = etype
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            except KeyError:
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                # If no translation found, leave the entity type as is
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                etype = rhs.value
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            # Memorize variable's type
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            vartypes[lhs.name] = etype
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        else:
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            try:
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                translation_set = translations[rtype]
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            except KeyError:
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                pass # If no translation found, leave the relation type as is
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            else:
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                # Only one possible translation, no ambiguity
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                if len(translation_set) == 1:
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                    relation.r_type = iter(translations[rtype]).next()
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                # More than 1 possible translation => resolve it later
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                else:
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                    ambiguous_nodes[relation] = (lhs.name, translation_set)
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    if ambiguous_nodes:
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        resolve_ambiguities(vartypes, ambiguous_nodes, schema)
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def resolve_ambiguities(var_types, ambiguous_nodes, schema):
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    """Tries to resolve remaining ambiguities for translation
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    /!\ An ambiguity is when two different string can be localized with
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        the same string
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    A simple example:
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      - 'name' in a company context will be localized as 'nom' in French
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      - but ... 'surname' will also be localized as 'nom'
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    :type var_types: dict
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    :param var_types: a map : var_name / var_type
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    :type ambiguous_nodes: dict
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    :param ambiguous_nodes: a map : relation_node / (var_name, available_translations)
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    :type schema: `cubicweb.schema.Schema`
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    :param schema: the application's schema
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    """
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    # Now, try to resolve ambiguous translations
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    for relation, (var_name, translations_found) in ambiguous_nodes.items():
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        try:
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            vartype = var_types[var_name]
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        except KeyError:
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            continue
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        # Get schema for this entity type
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        eschema = schema.eschema(vartype)
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        rtype = _get_approriate_translation(translations_found, eschema)
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        if rtype is None:
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            continue
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        relation.r_type = rtype
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QUOTED_SRE = re.compile(r'(.*?)(["\'])(.+?)\2')
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TRANSLATION_MAPS = {}
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def trmap(config, schema, lang):
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    try:
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        return TRANSLATION_MAPS[lang]
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    except KeyError:
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        assert lang in config.translations, '%s %s' % (lang, config.translations)
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        tr = config.translations[lang]
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        langmap = {}
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        for etype in schema.entities():
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            etype = str(etype)
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            langmap[tr(etype).capitalize()] = etype
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            langmap[etype.capitalize()] = etype
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        for rtype in schema.relations():
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            rtype = str(rtype)
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            langmap.setdefault(tr(rtype).lower(), set()).add(rtype)
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            langmap.setdefault(rtype, set()).add(rtype)
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        TRANSLATION_MAPS[lang] = langmap
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        return langmap
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class BaseQueryProcessor(Component):
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    __abstract__ = True
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    id = 'magicsearch_processor'
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    # set something if you want explicit component search facility for the
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    # component
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    name = None
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    def process_query(self, uquery, req):
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        args = self.preprocess_query(uquery, req)
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        try:
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            return req.execute(*args)
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        finally:
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            # rollback necessary to avoid leaving the connection in a bad state
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            req.cnx.rollback() 
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    def preprocess_query(self, uquery, req):
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        raise NotImplementedError()
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class DoNotPreprocess(BaseQueryProcessor):
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    """this one returns the raw query and should be placed in first position
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    of the chain
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    """
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    name = 'rql'
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    priority = 0
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    def preprocess_query(self, uquery, req):
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        return uquery,
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class QueryTranslator(BaseQueryProcessor):
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    """ parses through rql and translates into schema language entity names 
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    and attributes
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    """
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    priority = 2
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    def preprocess_query(self, uquery, req):
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        try:
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            rqlst = parse(uquery, print_errors=False)
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        except (RQLSyntaxError, BadRQLQuery), err:
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            return uquery,
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        schema = self.vreg.schema
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        # rql syntax tree will be modified in place if necessary
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        translate_rql_tree(rqlst, trmap(self.config, schema, req.lang), schema)
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        return rqlst.as_string(),
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class QSPreProcessor(BaseQueryProcessor):
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    """Quick search preprocessor
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    preprocessing query in shortcut form to their RQL form
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    """
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    priority = 4
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    def preprocess_query(self, uquery, req):
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        """try to get rql from an unicode query string"""
0
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        args = None
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        self.req = req
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        try:
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            # Process as if there was a quoted part
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            args = self._quoted_words_query(uquery)
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        ## No quoted part  
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        except BadRQLQuery:
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            words = uquery.split()
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            if len(words) == 1:
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                args = self._one_word_query(*words)
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            elif len(words) == 2:
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                args = self._two_words_query(*words)
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            elif len(words) == 3:
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                args = self._three_words_query(*words)
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            else:
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                args = self._multiple_words_query(words)
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        return args
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   208
    
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    def _get_entity_type(self, word):
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        """check if the given word is matching an entity type, return it if
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        it's the case or raise BadRQLQuery if not
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        """
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        etype = word.capitalize()
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        try:
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            return trmap(self.config, self.vreg.schema, self.req.lang)[etype]
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        except KeyError:
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            raise BadRQLQuery('%s is not a valid entity name' % etype)        
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    def _get_attribute_name(self, word, eschema):
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        """check if the given word is matching an attribute of the given entity type,
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        return it normalized if found or return it untransformed else
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        """
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        """Returns the attributes's name as stored in the DB"""
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   224
        # Need to convert from unicode to string (could be whatever)
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   225
        rtype = word.lower()
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        # Find the entity name as stored in the DB
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        translations = trmap(self.config, self.vreg.schema, self.req.lang)
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        try:
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   229
            translations = translations[rtype]
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   230
        except KeyError:
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   231
            raise BadRQLQuery('%s is not a valid attribute for %s entity type'
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   232
                              % (word, eschema))
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        rtype = _get_approriate_translation(translations, eschema)
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   234
        if rtype is None:
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            raise BadRQLQuery('%s is not a valid attribute for %s entity type'
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   236
                              % (word, eschema))
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        return rtype
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   238
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    def _one_word_query(self, word):
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        """Specific process for one word query (case (1) of preprocess_rql)
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diff changeset
   241
        """
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        # if this is an integer, then directly go to eid
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   243
        try:
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   244
            eid = int(word)
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   245
            return 'Any X WHERE X eid %(x)s', {'x': eid}, 'x'
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   246
        except ValueError:
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   247
            etype = self._get_entity_type(word)
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            return '%s %s' % (etype, etype[0]),
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   249
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    def _complete_rql(self, searchstr, etype, rtype=None, var=None, searchattr=None):
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   251
        searchop = ''
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   252
        if '%' in searchstr:
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   253
            if rtype:
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                possible_etypes = self.schema.rschema(rtype).objects(etype)
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            else:
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   256
                possible_etypes = [self.schema.eschema(etype)]
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   257
            if searchattr or len(possible_etypes) == 1:
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   258
                searchattr = searchattr or possible_etypes[0].main_attribute()
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   259
                searchop = 'LIKE '
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   260
        searchattr = searchattr or 'has_text'
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   261
        if var is None:
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   262
            var = etype[0]
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   263
        return '%s %s %s%%(text)s' % (var, searchattr, searchop)
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   264
        
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   265
    def _two_words_query(self, word1, word2):
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   266
        """Specific process for two words query (case (2) of preprocess_rql)
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   267
        """
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   268
        etype = self._get_entity_type(word1)
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   269
        # this is a valid RQL query : ("Person X", or "Person TMP1")
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   270
        if len(word2) == 1 and word2.isupper():
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   271
            return '%s %s' % (etype, word2),
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   272
        # else, suppose it's a shortcut like : Person Smith
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   273
        rql = '%s %s WHERE %s' % (etype, etype[0], self._complete_rql(word2, etype))
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   274
        return rql, {'text': word2}
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parents:
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   275
           
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   276
    def _three_words_query(self, word1, word2, word3):
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   277
        """Specific process for three words query (case (3) of preprocess_rql)
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   278
        """
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   279
        etype = self._get_entity_type(word1)
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   280
        eschema = self.schema.eschema(etype)
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   281
        rtype = self._get_attribute_name(word2, eschema)
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   282
        # expand shortcut if rtype is a non final relation
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diff changeset
   283
        if not self.schema.rschema(rtype).is_final():
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   284
            return self._expand_shortcut(etype, rtype, word3)
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   285
        if '%' in word3:
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parents:
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   286
            searchop = 'LIKE '
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parents:
diff changeset
   287
        else:
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parents:
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   288
            searchop = ''
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   289
        rql = '%s %s WHERE %s' % (etype, etype[0],
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parents:
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   290
                                  self._complete_rql(word3, etype, searchattr=rtype))
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   291
        return rql, {'text': word3}
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parents:
diff changeset
   292
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   293
    def _multiple_words_query(self, words):
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   294
        """specific process for more than 3 words query"""
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diff changeset
   295
        return ' '.join(words),
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parents:
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   296
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   297
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   298
    def _expand_shortcut(self, etype, rtype, searchstr):
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parents:
diff changeset
   299
        """Expands shortcut queries on a non final relation to use has_text or
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   300
        the main attribute (according to possible entity type) if '%' is used in the
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   301
        search word
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parents:
diff changeset
   302
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   303
        Transforms : 'person worksat IBM' into
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parents:
diff changeset
   304
        'Personne P WHERE P worksAt C, C has_text "IBM"'
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parents:
diff changeset
   305
        """
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parents:
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   306
        # check out all possilbe entity types for the relation represented
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parents:
diff changeset
   307
        # by 'rtype'
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parents:
diff changeset
   308
        mainvar = etype[0]
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parents:
diff changeset
   309
        searchvar = mainvar  + '1'
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parents:
diff changeset
   310
        rql =  '%s %s WHERE %s %s %s, %s' % (etype, mainvar,  # Person P
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parents:
diff changeset
   311
                                             mainvar, rtype, searchvar, # P worksAt C
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diff changeset
   312
                                             self._complete_rql(searchstr, etype,
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parents:
diff changeset
   313
                                                                rtype=rtype, var=searchvar))
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parents:
diff changeset
   314
        return rql, {'text': searchstr}
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parents:
diff changeset
   315
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parents:
diff changeset
   316
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parents:
diff changeset
   317
    def _quoted_words_query(self, ori_rql):
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parents:
diff changeset
   318
        """Specific process when there's a "quoted" part
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parents:
diff changeset
   319
        """
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parents:
diff changeset
   320
        m = QUOTED_SRE.match(ori_rql)
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parents:
diff changeset
   321
        # if there's no quoted part, then no special pre-processing to do
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   322
        if m is None:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   323
            raise BadRQLQuery("unable to handle request %r" % ori_rql)
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parents:
diff changeset
   324
        left_words = m.group(1).split()
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parents:
diff changeset
   325
        quoted_part = m.group(3)
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parents:
diff changeset
   326
        # Case (1) : Company "My own company"
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parents:
diff changeset
   327
        if len(left_words) == 1:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   328
            try:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   329
                word1 = left_words[0]
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parents:
diff changeset
   330
                return self._two_words_query(word1, quoted_part)
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parents:
diff changeset
   331
            except BadRQLQuery, error:
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parents:
diff changeset
   332
                raise BadRQLQuery("unable to handle request %r" % ori_rql)
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parents:
diff changeset
   333
        # Case (2) : Company name "My own company";
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parents:
diff changeset
   334
        elif len(left_words) == 2:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   335
            word1, word2 = left_words
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   336
            return self._three_words_query(word1, word2, quoted_part)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   337
            # return ori_rql
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parents:
diff changeset
   338
        raise BadRQLQuery("unable to handle request %r" % ori_rql)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   339
    
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   340
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   341
 
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   342
class FullTextTranslator(BaseQueryProcessor):
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parents:
diff changeset
   343
    priority = 10
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   344
    name = 'text'
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   345
    
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parents:
diff changeset
   346
    def preprocess_query(self, uquery, req):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   347
        """suppose it's a plain text query"""
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   348
        return 'Any X WHERE X has_text %(text)s', {'text': uquery}
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   349
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   350
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   351
661
4f61eb8a96b7 properly kill/depreciate component base class, only keep Component
sylvain.thenault@logilab.fr
parents: 0
diff changeset
   352
class MagicSearchComponent(Component):
0
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   353
    id  = 'magicsearch'
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parents:
diff changeset
   354
    def __init__(self, req, rset=None):
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parents:
diff changeset
   355
        super(MagicSearchComponent, self).__init__(req, rset)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   356
        processors = []
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   357
        self.by_name = {}
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   358
        for processorcls in self.vreg.registry_objects('components',
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   359
                                                       'magicsearch_processor'):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   360
            # instantiation needed
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   361
            processor = processorcls()
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   362
            processors.append(processor)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   363
            if processor.name is not None:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   364
                assert not processor.name in self.by_name
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   365
                self.by_name[processor.name.lower()] = processor
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   366
        self.processors = sorted(processors, key=lambda x: x.priority)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   367
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parents:
diff changeset
   368
    def process_query(self, uquery, req):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   369
        assert isinstance(uquery, unicode)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   370
        try:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   371
            procname, query = uquery.split(':', 1)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   372
            proc = self.by_name[procname.strip().lower()]
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   373
            uquery = query.strip()
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   374
        except:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   375
            # use processor chain
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   376
            unauthorized = None
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   377
            for proc in self.processors:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   378
                try:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   379
                    return proc.process_query(uquery, req)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   380
                # FIXME : we don't want to catch any exception type here !
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   381
                except (RQLSyntaxError, BadRQLQuery):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   382
                    pass
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   383
                except Unauthorized, ex:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   384
                    unauthorized = ex
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   385
                    continue
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   386
                except Exception, ex:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   387
                    LOGGER.debug('%s: %s', ex.__class__.__name__, ex)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   388
                    continue
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   389
            if unauthorized:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   390
                raise unauthorized
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   391
        else:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   392
            # let exception propagate
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   393
            return proc.process_query(uquery, req)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   394
        raise BadRQLQuery(req._('sorry, the server is unable to handle this query'))