web/views/magicsearch.py
author Aurelien Campeas <aurelien.campeas@logilab.fr>
Wed, 23 Nov 2011 14:45:13 +0100
changeset 8094 bedf36fb17f1
parent 7990 a673d1d9a738
child 8505 dcd9bc1d1bca
permissions -rw-r--r--
[tableview] fix action menu layout (closes #2099011) * on the left instead of the right of the table * remove the arrow and the bullets
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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2a164a9cf81c [exceptions] stop catching any exception in various places (closes #1942716)
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# copyright 2003-2011 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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# This file is part of CubicWeb.
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#
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# CubicWeb is free software: you can redistribute it and/or modify it under the
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# terms of the GNU Lesser General Public License as published by the Free
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# Software Foundation, either version 2.1 of the License, or (at your option)
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# any later version.
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#
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# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Lesser General Public License along
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# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
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"""a query processor to handle quick search shortcuts for cubicweb"""
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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 warnings import warn
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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, typed_eid
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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 instance'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 instance'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, ctxtr = config.translations[lang]
0
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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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    __regid__ = 'magicsearch_processor'
0
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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):
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        args = self.preprocess_query(uquery)
0
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        try:
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            return self._cw.execute(*args)
0
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        finally:
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            # rollback necessary to avoid leaving the connection in a bad state
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            self._cw.cnx.rollback()
0
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    def preprocess_query(self, uquery):
0
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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):
0
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        return uquery,
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0
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class QueryTranslator(BaseQueryProcessor):
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    """ parses through rql and translates into schema language entity names
0
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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):
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        rqlst = parse(uquery, print_errors=False)
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        schema = self._cw.vreg.schema
0
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        # rql syntax tree will be modified in place if necessary
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        translate_rql_tree(rqlst, trmap(self._cw.vreg.config, schema, self._cw.lang),
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                           schema)
0
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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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   198
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    def preprocess_query(self, uquery):
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        """try to get rql from an unicode query string"""
0
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        args = None
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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
0
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   206
        except BadRQLQuery:
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   207
            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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   212
            elif len(words) == 3:
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                args = self._three_words_query(*words)
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            else:
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   215
                raise
0
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   216
        return args
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   217
0
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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._cw.vreg.config, self._cw.vreg.schema, self._cw.lang)[etype]
0
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        except KeyError:
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            raise BadRQLQuery('%s is not a valid entity name' % etype)
0
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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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        # Need to convert from unicode to string (could be whatever)
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        rtype = word.lower()
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        # Find the entity name as stored in the DB
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        translations = trmap(self._cw.vreg.config, self._cw.vreg.schema, self._cw.lang)
0
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        try:
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            translations = translations[rtype]
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        except KeyError:
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            raise BadRQLQuery('%s is not a valid attribute for %s entity type'
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                              % (word, eschema))
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        rtype = _get_approriate_translation(translations, eschema)
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   243
        if rtype is None:
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            raise BadRQLQuery('%s is not a valid attribute for %s entity type'
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                              % (word, eschema))
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        return rtype
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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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   250
        """
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        # if this is an integer, then directly go to eid
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        try:
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   253
            eid = typed_eid(word)
0
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            return 'Any X WHERE X eid %(x)s', {'x': eid}, 'x'
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        except ValueError:
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            etype = self._get_entity_type(word)
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            return '%s %s' % (etype, etype[0]),
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    def _complete_rql(self, searchstr, etype, rtype=None, var=None, searchattr=None):
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        searchop = ''
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        if '%' in searchstr:
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            if rtype:
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                possible_etypes = self._cw.vreg.schema.rschema(rtype).objects(etype)
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            else:
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                possible_etypes = [self._cw.vreg.schema.eschema(etype)]
0
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            if searchattr or len(possible_etypes) == 1:
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                searchattr = searchattr or possible_etypes[0].main_attribute()
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                searchop = 'LIKE '
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        searchattr = searchattr or 'has_text'
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        if var is None:
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            var = etype[0]
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        return '%s %s %s%%(text)s' % (var, searchattr, searchop)
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0
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    def _two_words_query(self, word1, word2):
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        """Specific process for two words query (case (2) of preprocess_rql)
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        """
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        etype = self._get_entity_type(word1)
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        # this is a valid RQL query : ("Person X", or "Person TMP1")
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   279
        if len(word2) == 1 and word2.isupper():
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   280
            return '%s %s' % (etype, word2),
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        # else, suppose it's a shortcut like : Person Smith
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        restriction = self._complete_rql(word2, etype)
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        if ' has_text ' in restriction:
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            rql = '%s %s ORDERBY FTIRANK(%s) DESC WHERE %s' % (
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                etype, etype[0], etype[0], restriction)
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        else:
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            rql = '%s %s WHERE %s' % (
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   288
                etype, etype[0], restriction)
0
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        return rql, {'text': word2}
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0
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   291
    def _three_words_query(self, word1, word2, word3):
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        """Specific process for three words query (case (3) of preprocess_rql)
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   293
        """
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   294
        etype = self._get_entity_type(word1)
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   295
        eschema = self._cw.vreg.schema.eschema(etype)
0
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   296
        rtype = self._get_attribute_name(word2, eschema)
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   297
        # expand shortcut if rtype is a non final relation
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   298
        if not self._cw.vreg.schema.rschema(rtype).final:
0
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   299
            return self._expand_shortcut(etype, rtype, word3)
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   300
        if '%' in word3:
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   301
            searchop = 'LIKE '
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   302
        else:
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   303
            searchop = ''
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   304
        rql = '%s %s WHERE %s' % (etype, etype[0],
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diff changeset
   305
                                  self._complete_rql(word3, etype, searchattr=rtype))
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   306
        return rql, {'text': word3}
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   307
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   308
    def _expand_shortcut(self, etype, rtype, searchstr):
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   309
        """Expands shortcut queries on a non final relation to use has_text or
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   310
        the main attribute (according to possible entity type) if '%' is used in the
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   311
        search word
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   312
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   313
        Transforms : 'person worksat IBM' into
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   314
        'Personne P WHERE P worksAt C, C has_text "IBM"'
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diff changeset
   315
        """
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   316
        # check out all possilbe entity types for the relation represented
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   317
        # by 'rtype'
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   318
        mainvar = etype[0]
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   319
        searchvar = mainvar  + '1'
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        restriction = self._complete_rql(searchstr, etype, rtype=rtype,
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   321
                                         var=searchvar)
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   322
        if ' has_text ' in restriction:
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   323
            rql =  ('%s %s ORDERBY FTIRANK(%s) DESC '
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   324
                    'WHERE %s %s %s, %s' % (etype, mainvar, searchvar,
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   325
                                            mainvar, rtype, searchvar, # P worksAt C
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   326
                                            restriction))
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   327
        else:
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   328
            rql =  ('%s %s WHERE %s %s %s, %s' % (etype, mainvar,
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   329
                                            mainvar, rtype, searchvar, # P worksAt C
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   330
                                            restriction))
0
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   331
        return rql, {'text': searchstr}
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   332
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diff changeset
   333
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   334
    def _quoted_words_query(self, ori_rql):
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   335
        """Specific process when there's a "quoted" part
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diff changeset
   336
        """
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   337
        m = QUOTED_SRE.match(ori_rql)
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   338
        # if there's no quoted part, then no special pre-processing to do
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diff changeset
   339
        if m is None:
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   340
            raise BadRQLQuery("unable to handle request %r" % ori_rql)
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   341
        left_words = m.group(1).split()
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   342
        quoted_part = m.group(3)
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   343
        # Case (1) : Company "My own company"
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   344
        if len(left_words) == 1:
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   345
            try:
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   346
                word1 = left_words[0]
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   347
                return self._two_words_query(word1, quoted_part)
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   348
            except BadRQLQuery, error:
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   349
                raise BadRQLQuery("unable to handle request %r" % ori_rql)
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   350
        # Case (2) : Company name "My own company";
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   351
        elif len(left_words) == 2:
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   352
            word1, word2 = left_words
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diff changeset
   353
            return self._three_words_query(word1, word2, quoted_part)
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diff changeset
   354
            # return ori_rql
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diff changeset
   355
        raise BadRQLQuery("unable to handle request %r" % ori_rql)
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diff changeset
   356
0
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   357
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   358
0
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   359
class FullTextTranslator(BaseQueryProcessor):
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   360
    priority = 10
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   361
    name = 'text'
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   362
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diff changeset
   363
    def preprocess_query(self, uquery):
0
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   364
        """suppose it's a plain text query"""
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diff changeset
   365
        return 'Any X ORDERBY FTIRANK(X) DESC WHERE X has_text %(text)s', {'text': uquery}
0
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diff changeset
   366
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   367
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   368
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   369
class MagicSearchComponent(Component):
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   370
    __regid__  = 'magicsearch'
0
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   371
    def __init__(self, req, rset=None):
2890
fdcb8a2bb6eb fix __init__ parameters
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2650
diff changeset
   372
        super(MagicSearchComponent, self).__init__(req, rset=rset)
0
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   373
        processors = []
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   374
        self.by_name = {}
3451
6b46d73823f5 [api] work in progress, use __regid__, cw_*, etc.
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 3408
diff changeset
   375
        for processorcls in self._cw.vreg['components']['magicsearch_processor']:
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   376
            # instantiation needed
3462
3a79fecdd2b4 [magicsearch] make tests pass again: base preprocessor must have access to vreg
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 3451
diff changeset
   377
            processor = processorcls(self._cw)
0
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   378
            processors.append(processor)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   379
            if processor.name is not None:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   380
                assert not processor.name in self.by_name
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   381
                self.by_name[processor.name.lower()] = processor
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   382
        self.processors = sorted(processors, key=lambda x: x.priority)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   383
3469
1e28876c4b55 [magicsearch] (pre_)process_query doesn't need the req argument, instances already have access to self._cw
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 3462
diff changeset
   384
    def process_query(self, uquery):
0
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   385
        assert isinstance(uquery, unicode)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   386
        try:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   387
            procname, query = uquery.split(':', 1)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   388
            proc = self.by_name[procname.strip().lower()]
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   389
            uquery = query.strip()
7815
2a164a9cf81c [exceptions] stop catching any exception in various places (closes #1942716)
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5768
diff changeset
   390
        except Exception:
0
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   391
            # use processor chain
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   392
            unauthorized = None
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   393
            for proc in self.processors:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   394
                try:
7990
a673d1d9a738 [diet] drop pre 3.6 API compatibility (but attempt to keep data cmopatibility). Closes #2017916
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 7815
diff changeset
   395
                    return proc.process_query(uquery)
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   396
                # FIXME : we don't want to catch any exception type here !
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   397
                except (RQLSyntaxError, BadRQLQuery):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   398
                    pass
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   399
                except Unauthorized, ex:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   400
                    unauthorized = ex
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   401
                    continue
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   402
                except Exception, ex:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   403
                    LOGGER.debug('%s: %s', ex.__class__.__name__, ex)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   404
                    continue
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   405
            if unauthorized:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   406
                raise unauthorized
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   407
        else:
3469
1e28876c4b55 [magicsearch] (pre_)process_query doesn't need the req argument, instances already have access to self._cw
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 3462
diff changeset
   408
            # explicitly specified processor: don't try to catch the exception
1e28876c4b55 [magicsearch] (pre_)process_query doesn't need the req argument, instances already have access to self._cw
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 3462
diff changeset
   409
            return proc.process_query(uquery)
1e28876c4b55 [magicsearch] (pre_)process_query doesn't need the req argument, instances already have access to self._cw
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 3462
diff changeset
   410
        raise BadRQLQuery(self._cw._('sorry, the server is unable to handle this query'))