rset.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Mon, 21 Dec 2009 18:45:42 +0100
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"""The `ResultSet` class which is returned as result of a rql query
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:organization: Logilab
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:copyright: 2001-2009 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
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"""
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__docformat__ = "restructuredtext en"
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from logilab.common.decorators import cached, clear_cache, copy_cache
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from rql import nodes, stmts
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from cubicweb import NotAnEntity
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class ResultSet(object):
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    """a result set wrap a RQL query result. This object implements a partial
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    list protocol to allow direct use as a list of result rows.
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    :type rowcount: int
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    :ivar rowcount: number of rows in the result
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    :type rows: list
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    :ivar rows: list of rows of result
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    :type description: list
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    :ivar description:
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      result's description, using the same structure as the result itself
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    :type rql: str or unicode
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    :ivar rql: the original RQL query string
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    """
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    def __init__(self, results, rql, args=None, description=(), cachekey=None,
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                 rqlst=None):
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        self.rows = results
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        self.rowcount = results and len(results) or 0
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        # original query and arguments
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        self.rql = rql
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        self.args = args
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        self.cachekey = cachekey
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        # entity types for each cell (same shape as rows)
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        # maybe discarded if specified when the query has been executed
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        self.description = description
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        # parsed syntax tree
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        if rqlst is not None:
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            rqlst.schema = None # reset schema in case of pyro transfert
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        self._rqlst = rqlst
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        # set to (limit, offset) when a result set is limited using the
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        # .limit method
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        self.limited = None
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        # set by the cursor which returned this resultset
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        self.vreg = None
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        self.req = None
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        # actions cache
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        self._rsetactions = None
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    def __str__(self):
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        if not self.rows:
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            return '<empty resultset %s>' % self.rql
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        return '<resultset %s (%s rows)>' % (self.rql, len(self.rows))
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    def __repr__(self):
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        if not self.rows:
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            return '<empty resultset for %r>' % self.rql
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        rows = self.rows
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        if len(rows) > 10:
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            rows = rows[:10] + ['...']
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        if not self.description:
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            return '<resultset %r (%s rows): %s>' % (self.rql, len(self.rows),
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                                                     '\n'.join(str(r) for r in rows))
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        return '<resultset %r (%s rows): %s>' % (self.rql, len(self.rows),
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                                                 '\n'.join('%s (%s)' % (r, d)
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                                                           for r, d in zip(rows, self.description)))
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    def possible_actions(self, **kwargs):
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        if self._rsetactions is None:
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            self._rsetactions = {}
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        if kwargs:
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            key = tuple(sorted(kwargs.iteritems()))
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        else:
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            key = None
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        try:
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            return self._rsetactions[key]
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        except KeyError:
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            actions = self.vreg['actions'].poss_visible_objects(
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                self.req, rset=self, **kwargs)
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            self._rsetactions[key] = actions
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            return actions
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    def __len__(self):
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        """returns the result set's size"""
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        return self.rowcount
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    def __nonzero__(self):
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        return self.rowcount
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    def __getitem__(self, i):
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        """returns the ith element of the result set"""
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        return self.rows[i] #ResultSetRow(self.rows[i])
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    def __getslice__(self, i, j):
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        """returns slice [i:j] of the result set"""
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        return self.rows[i:j]
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    def __iter__(self):
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        """Returns an iterator over rows"""
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        return iter(self.rows)
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    def __add__(self, rset):
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        # XXX buggy implementation (.rql and .args attributes at least much
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        # probably differ)
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        # at least rql could be fixed now that we have union and sub-queries
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        # but I tend to think that since we have that, we should not need this
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        # method anymore (syt)
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        rset = ResultSet(self.rows+rset.rows, self.rql, self.args,
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                         self.description +rset.description)
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        return self.req.decorate_rset(rset)
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    def copy(self, rows=None, descr=None):
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        if rows is None:
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            rows = self.rows[:]
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            descr = self.description[:]
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        rset = ResultSet(rows, self.rql, self.args, descr)
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        return self.req.decorate_rset(rset)
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    def transformed_rset(self, transformcb):
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        """ the result set according to a given column types
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        :type transormcb: callable(row, desc)
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        :param transformcb:
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          a callable which should take a row and its type description as
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          parameters, and return the transformed row and type description.
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0
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        :type col: int
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        :param col: the column index
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        :rtype: `ResultSet`
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        """
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        rows, descr = [], []
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        rset = self.copy(rows, descr)
0
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        for row, desc in zip(self.rows, self.description):
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            nrow, ndesc = transformcb(row, desc)
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            if ndesc: # transformcb returns None for ndesc to skip that row
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                rows.append(nrow)
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                descr.append(ndesc)
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        rset.rowcount = len(rows)
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        return rset
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    def filtered_rset(self, filtercb, col=0):
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        """filter the result set according to a given filtercb
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        :type filtercb: callable(entity)
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        :param filtercb:
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          a callable which should take an entity as argument and return
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          False if it should be skipped, else True
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        :type col: int
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        :param col: the column index
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        :rtype: `ResultSet`
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        """
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        rows, descr = [], []
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        rset = self.copy(rows, descr)
0
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        for i in xrange(len(self)):
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            if not filtercb(self.get_entity(i, col)):
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                continue
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            rows.append(self.rows[i])
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            descr.append(self.description[i])
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        rset.rowcount = len(rows)
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        return rset
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    def sorted_rset(self, keyfunc, reverse=False, col=0):
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        """sorts the result set according to a given keyfunc
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        :type keyfunc: callable(entity)
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        :param keyfunc:
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          a callable which should take an entity as argument and return
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          the value used to compare and sort
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        :type reverse: bool
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        :param reverse: if the result should be reversed
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        :type col: int
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        :param col: the column index. if col = -1, the whole row are used
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        :rtype: `ResultSet`
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        """
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        rows, descr = [], []
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        rset = self.copy(rows, descr)
0
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        if col >= 0:
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            entities = sorted(enumerate(self.entities(col)),
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                              key=lambda (i, e): keyfunc(e), reverse=reverse)
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        else:
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            entities = sorted(enumerate(self),
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                              key=lambda (i, e): keyfunc(e), reverse=reverse)
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        for index, _ in entities:
0
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            rows.append(self.rows[index])
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            descr.append(self.description[index])
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        rset.rowcount = len(rows)
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        return rset
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    def split_rset(self, keyfunc=None, col=0, return_dict=False):
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        """Splits the result set in multiple result set according to a given key
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0
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        :type keyfunc: callable(entity or FinalType)
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        :param keyfunc:
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          a callable which should take a value of the rset in argument and
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          return the value used to group the value. If not define, raw value
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          of the specified columns is used.
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        :type col: int
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        :param col: the column index. if col = -1, the whole row are used
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        :type return_dict: Boolean
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        :param return_dict: If true, the function return a mapping
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            (key -> rset) instead of a list of rset
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        :rtype: List of `ResultSet` or mapping of  `ResultSet`
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        """
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        result = []
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        mapping = {}
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        for idx, line in enumerate(self):
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            if col >= 0:
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                try:
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                    key = self.get_entity(idx, col)
0
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                except NotAnEntity:
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                    key = line[col]
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            else:
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                key = line
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            if keyfunc is not None:
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                key = keyfunc(key)
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            if key not in mapping:
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                rows, descr = [], []
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                rset = self.copy(rows, descr)
0
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   240
                mapping[key] = rset
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                result.append(rset)
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            else:
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   243
                rset = mapping[key]
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            rset.rows.append(self.rows[idx])
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            rset.description.append(self.description[idx])
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   246
        for rset in result:
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            rset.rowcount = len(rset.rows)
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        if return_dict:
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   249
            return mapping
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        else:
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   251
            return result
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    def limited_rql(self):
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        """return a printable rql for the result set associated to the object,
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        with limit/offset correctly set according to maximum page size and
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   256
        currently displayed page when necessary
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        """
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        # try to get page boundaries from the navigation component
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        # XXX we should probably not have a ref to this component here (eg in
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   260
        #     cubicweb)
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   261
        nav = self.vreg['components'].select_or_none('navigation', self.req,
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   262
                                                     rset=self)
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   263
        if nav:
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   264
            start, stop = nav.page_boundaries()
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   265
            rql = self._limit_offset_rql(stop - start, start)
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   266
        # result set may have be limited manually in which case navigation won't
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   267
        # apply
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   268
        elif self.limited:
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   269
            rql = self._limit_offset_rql(*self.limited)
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   270
        # navigation component doesn't apply and rset has not been limited, no
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   271
        # need to limit query
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   272
        else:
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   273
            rql = self.printable_rql()
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   274
        return rql
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   275
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   276
    def _limit_offset_rql(self, limit, offset):
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   277
        rqlst = self.syntax_tree()
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   278
        if len(rqlst.children) == 1:
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   279
            select = rqlst.children[0]
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   280
            olimit, ooffset = select.limit, select.offset
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   281
            select.limit, select.offset = limit, offset
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   282
            rql = rqlst.as_string(kwargs=self.args)
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   283
            # restore original limit/offset
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   284
            select.limit, select.offset = olimit, ooffset
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   285
        else:
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   286
            newselect = stmts.Select()
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   287
            newselect.limit = limit
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   288
            newselect.offset = offset
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   289
            aliases = [nodes.VariableRef(newselect.get_variable(vref.name, i))
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diff changeset
   290
                       for i, vref in enumerate(rqlst.selection)]
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   291
            newselect.set_with([nodes.SubQuery(aliases, rqlst)], check=False)
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   292
            newunion = stmts.Union()
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diff changeset
   293
            newunion.append(newselect)
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diff changeset
   294
            rql = rqlst.as_string(kwargs=self.args)
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   295
            rqlst.parent = None
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   296
        return rql
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   297
0
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   298
    def limit(self, limit, offset=0, inplace=False):
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   299
        """limit the result set to the given number of rows optionaly starting
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   300
        from an index different than 0
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   301
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   302
        :type limit: int
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   303
        :param limit: the maximum number of results
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   304
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   305
        :type offset: int
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   306
        :param offset: the offset index
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   307
0
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   308
        :type inplace: bool
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   309
        :param inplace:
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   310
          if true, the result set is modified in place, else a new result set
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   311
          is returned and the original is left unmodified
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   312
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   313
        :rtype: `ResultSet`
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   314
        """
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   315
        stop = limit+offset
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   316
        rows = self.rows[offset:stop]
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   317
        descr = self.description[offset:stop]
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   318
        if inplace:
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   319
            rset = self
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   320
            rset.rows, rset.description = rows, descr
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   321
            rset.rowcount = len(rows)
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   322
            clear_cache(rset, 'description_struct')
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   323
            if offset:
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   324
                clear_cache(rset, 'get_entity')
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   325
            # we also have to fix/remove from the request entity cache entities
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   326
            # which get a wrong rset reference by this limit call
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   327
            for entity in self.req.cached_entities():
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diff changeset
   328
                if entity.cw_rset is self:
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diff changeset
   329
                    if offset <= entity.cw_row < stop:
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diff changeset
   330
                        entity.cw_row = entity.cw_row - offset
0
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   331
                    else:
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   332
                        self.req.drop_entity_cache(entity.eid)
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   333
        else:
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034aa14b740a drop _prepare_copy method from rset in favor of a more generic copy method
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diff changeset
   334
            rset = self.copy(rows, descr)
0
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   335
            if not offset:
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   336
                # can copy built entity caches
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   337
                copy_cache(rset, 'get_entity', self)
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   338
        rset.limited = (limit, offset)
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   339
        return rset
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   340
0
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   341
    def printable_rql(self, encoded=False):
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   342
        """return the result set's origin rql as a string, with arguments
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   343
        substitued
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   344
        """
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   345
        encoding = self.req.encoding
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   346
        rqlstr = self.syntax_tree().as_string(encoding, self.args)
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   347
        # sounds like we get encoded or unicode string due to a bug in as_string
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   348
        if not encoded:
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   349
            if isinstance(rqlstr, unicode):
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   350
                return rqlstr
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   351
            return unicode(rqlstr, encoding)
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   352
        else:
0
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   353
            if isinstance(rqlstr, unicode):
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   354
                return rqlstr.encode(encoding)
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   355
            return rqlstr
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   356
0
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   357
    # client helper methods ###################################################
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   358
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   359
    def entities(self, col=0):
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   360
        """iter on entities with eid in the `col` column of the result set"""
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   361
        for i in xrange(len(self)):
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   362
            # may have None values in case of outer join (or aggregat on eid
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   363
            # hacks)
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   364
            if self.rows[i][col] is not None:
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   365
                yield self.get_entity(i, col)
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   366
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diff changeset
   367
    def complete_entity(self, row, col=0, skip_bytes=True):
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   368
        """short cut to get an completed entity instance for a particular
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   369
        row (all instance's attributes have been fetched)
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diff changeset
   370
        """
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2650
diff changeset
   371
        entity = self.get_entity(row, col)
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2650
diff changeset
   372
        entity.complete(skip_bytes=skip_bytes)
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2650
diff changeset
   373
        return entity
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2650
diff changeset
   374
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   375
    @cached
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   376
    def get_entity(self, row, col=None):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   377
        """special method for query retreiving a single entity, returns a
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   378
        partially initialized Entity instance.
1802
d628defebc17 delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 1477
diff changeset
   379
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   380
        WARNING: due to the cache wrapping this function, you should NEVER
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   381
                 give row as a named parameter (i.e. rset.get_entity(req, 0)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   382
                 is OK but rset.get_entity(row=0, req=req) isn't
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   383
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   384
        :type row,col: int, int
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   385
        :param row,col:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   386
          row and col numbers localizing the entity among the result's table
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   387
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   388
        :return: the partially initialized `Entity` instance
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   389
        """
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   390
        if col is None:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   391
            from warnings import warn
3405
9d31c9cb8103 nicer deprecation warnings
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3379
diff changeset
   392
            msg = '[3.2] col parameter will become mandatory in future version'
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   393
            warn(msg, DeprecationWarning, stacklevel=3)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   394
            col = 0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   395
        etype = self.description[row][col]
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   396
        try:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   397
            eschema = self.vreg.schema.eschema(etype)
3689
deb13e88e037 follow yams 0.25 api changes to improve performance
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3625
diff changeset
   398
            if eschema.final:
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   399
                raise NotAnEntity(etype)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   400
        except KeyError:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   401
            raise NotAnEntity(etype)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   402
        return self._build_entity(row, col)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   403
2647
b0a2e779845c enable server side entity caching, 25% speedup on codenaf insertion. ALL CW TESTS OK
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2381
diff changeset
   404
    def _build_entity(self, row, col):
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   405
        """internal method to get a single entity, returns a
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   406
        partially initialized Entity instance.
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   407
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   408
        partially means that only attributes selected in the RQL
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   409
        query will be directly assigned to the entity.
1802
d628defebc17 delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 1477
diff changeset
   410
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   411
        :type row,col: int, int
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   412
        :param row,col:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   413
          row and col numbers localizing the entity among the result's table
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   414
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   415
        :return: the partially initialized `Entity` instance
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   416
        """
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   417
        req = self.req
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   418
        if req is None:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   419
            raise AssertionError('dont call get_entity with no req on the result set')
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   420
        rowvalues = self.rows[row]
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   421
        eid = rowvalues[col]
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   422
        assert eid is not None
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   423
        # return cached entity if exists. This also avoids potential recursion
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   424
        # XXX should we consider updating a cached entity with possible
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   425
        #     new attributes found in this resultset ?
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   426
        try:
2648
4ae7d02ce063 F [rset repo cache] set entity.rset when no set on entities retreived from the cache
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2647
diff changeset
   427
            entity = req.entity_cache(eid)
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   428
        except KeyError:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   429
            pass
2832
7fb67c54ffb9 [rset] better explanation, refactor try except
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2813
diff changeset
   430
        else:
3379
9192ba07890d use .cw_rset instead of rset on appobject classes
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3023
diff changeset
   431
            if entity.cw_rset is None:
2832
7fb67c54ffb9 [rset] better explanation, refactor try except
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2813
diff changeset
   432
                # entity has no rset set, this means entity has been created by
7fb67c54ffb9 [rset] better explanation, refactor try except
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2813
diff changeset
   433
                # the querier (req is a repository session) and so jas no rset
7fb67c54ffb9 [rset] better explanation, refactor try except
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2813
diff changeset
   434
                # info. Add it.
7fb67c54ffb9 [rset] better explanation, refactor try except
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2813
diff changeset
   435
                entity.cw_rset = self
7fb67c54ffb9 [rset] better explanation, refactor try except
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2813
diff changeset
   436
                entity.cw_row = row
7fb67c54ffb9 [rset] better explanation, refactor try except
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2813
diff changeset
   437
                entity.cw_col = col
7fb67c54ffb9 [rset] better explanation, refactor try except
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2813
diff changeset
   438
            return entity
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   439
        # build entity instance
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   440
        etype = self.description[row][col]
2650
18aec79ec3a3 R [vreg] important refactoring of the vregistry, moving behaviour to end dictionnary (and so leaving room for more flexibility ; keep bw compat ; update api usage in cw
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2648
diff changeset
   441
        entity = self.vreg['etypes'].etype_class(etype)(req, rset=self,
18aec79ec3a3 R [vreg] important refactoring of the vregistry, moving behaviour to end dictionnary (and so leaving room for more flexibility ; keep bw compat ; update api usage in cw
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2648
diff changeset
   442
                                                        row=row, col=col)
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   443
        entity.set_eid(eid)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   444
        # cache entity
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   445
        req.set_entity_cache(entity)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   446
        eschema = entity.e_schema
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   447
        # try to complete the entity if there are some additional columns
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   448
        if len(rowvalues) > 1:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   449
            rqlst = self.syntax_tree()
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   450
            if rqlst.TYPE == 'select':
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   451
                # UNION query, find the subquery from which this entity has been
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   452
                # found
3625
f03b55a18c43 fix bug w/ get_entity and subqueries
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3551
diff changeset
   453
                select, col = rqlst.locate_subquery(col, etype, self.args)
f03b55a18c43 fix bug w/ get_entity and subqueries
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3551
diff changeset
   454
            else:
f03b55a18c43 fix bug w/ get_entity and subqueries
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3551
diff changeset
   455
                select = rqlst
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   456
            # take care, due to outer join support, we may find None
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   457
            # values for non final relation
3877
7ca53fc72a0a reldefsecurity branch :
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3766
diff changeset
   458
            for i, attr, role in attr_desc_iterator(select, col):
3625
f03b55a18c43 fix bug w/ get_entity and subqueries
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3551
diff changeset
   459
                outerselidx = rqlst.subquery_selection_index(select, i)
f03b55a18c43 fix bug w/ get_entity and subqueries
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3551
diff changeset
   460
                if outerselidx is None:
f03b55a18c43 fix bug w/ get_entity and subqueries
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3551
diff changeset
   461
                    continue
3877
7ca53fc72a0a reldefsecurity branch :
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3766
diff changeset
   462
                if role == 'subject':
3689
deb13e88e037 follow yams 0.25 api changes to improve performance
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3625
diff changeset
   463
                    rschema = eschema.subjrels[attr]
deb13e88e037 follow yams 0.25 api changes to improve performance
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3625
diff changeset
   464
                    if rschema.final:
3625
f03b55a18c43 fix bug w/ get_entity and subqueries
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3551
diff changeset
   465
                        entity[attr] = rowvalues[outerselidx]
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   466
                        continue
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   467
                else:
3689
deb13e88e037 follow yams 0.25 api changes to improve performance
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3625
diff changeset
   468
                    rschema = eschema.objrels[attr]
3877
7ca53fc72a0a reldefsecurity branch :
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3766
diff changeset
   469
                rdef = eschema.rdef(attr, role)
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   470
                # only keep value if it can't be multivalued
3877
7ca53fc72a0a reldefsecurity branch :
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3766
diff changeset
   471
                if rdef.role_cardinality(role) in '1?':
3625
f03b55a18c43 fix bug w/ get_entity and subqueries
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3551
diff changeset
   472
                    if rowvalues[outerselidx] is None:
3877
7ca53fc72a0a reldefsecurity branch :
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3766
diff changeset
   473
                        if role == 'subject':
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   474
                            rql = 'Any Y WHERE X %s Y, X eid %s'
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   475
                        else:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   476
                            rql = 'Any Y WHERE Y %s X, X eid %s'
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   477
                        rrset = ResultSet([], rql % (attr, entity.eid))
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   478
                        req.decorate_rset(rrset)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   479
                    else:
3625
f03b55a18c43 fix bug w/ get_entity and subqueries
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3551
diff changeset
   480
                        rrset = self._build_entity(row, outerselidx).as_rset()
3877
7ca53fc72a0a reldefsecurity branch :
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3766
diff changeset
   481
                    entity.set_related_cache(attr, role, rrset)
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   482
        return entity
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   483
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   484
    @cached
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   485
    def syntax_tree(self):
1802
d628defebc17 delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 1477
diff changeset
   486
        """get the syntax tree for the source query.
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   487
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   488
        :rtype: rql.stmts.Statement
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   489
        :return: the RQL syntax tree of the originating query
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   490
        """
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   491
        if self._rqlst:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   492
            rqlst = self._rqlst.copy()
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   493
            # to avoid transport overhead when pyro is used, the schema has been
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   494
            # unset from the syntax tree
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   495
            rqlst.schema = self.vreg.schema
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   496
            self.vreg.rqlhelper.annotate(rqlst)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   497
        else:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   498
            rqlst = self.vreg.parse(self.req, self.rql, self.args)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   499
        return rqlst
1802
d628defebc17 delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 1477
diff changeset
   500
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   501
    @cached
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   502
    def column_types(self, col):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   503
        """return the list of different types in the column with the given col
1802
d628defebc17 delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 1477
diff changeset
   504
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   505
        :type col: int
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   506
        :param col: the index of the desired column
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   507
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   508
        :rtype: list
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   509
        :return: the different entities type found in the column
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   510
        """
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   511
        return frozenset(struc[-1][col] for struc in self.description_struct())
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   512
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   513
    @cached
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   514
    def description_struct(self):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   515
        """return a list describing sequence of results with the same
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   516
        description, e.g. :
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   517
        [[0, 4, ('Bug',)]
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   518
        [[0, 4, ('Bug',), [5, 8, ('Story',)]
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   519
        [[0, 3, ('Project', 'Version',)]]
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   520
        """
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   521
        result = []
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   522
        last = None
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   523
        for i, row in enumerate(self.description):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   524
            if row != last:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   525
                if last is not None:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   526
                    result[-1][1] = i - 1
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   527
                result.append( [i, None, row] )
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   528
                last = row
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   529
        if last is not None:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   530
            result[-1][1] = i
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   531
        return result
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   532
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   533
    @cached
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   534
    def related_entity(self, row, col):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   535
        """try to get the related entity to extract format information if any"""
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   536
        locate_query_col = col
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   537
        rqlst = self.syntax_tree()
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   538
        etype = self.description[row][col]
3689
deb13e88e037 follow yams 0.25 api changes to improve performance
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3625
diff changeset
   539
        if self.vreg.schema.eschema(etype).final:
572
9849fed789c9 test and fix potential error with None optional relation
sylvain.thenault@logilab.fr
parents: 170
diff changeset
   540
            # final type, find a better one to locate the correct subquery
1802
d628defebc17 delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 1477
diff changeset
   541
            # (ambiguous if possible)
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   542
            for i in xrange(len(rqlst.children[0].selection)):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   543
                if i == col:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   544
                    continue
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   545
                coletype = self.description[row][i]
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   546
                if coletype is None:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   547
                    continue
3689
deb13e88e037 follow yams 0.25 api changes to improve performance
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3625
diff changeset
   548
                if not self.vreg.schema.eschema(coletype).final:
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   549
                    etype = coletype
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   550
                    locate_query_col = i
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   551
                    if len(self.column_types(i)) > 1:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   552
                        break
572
9849fed789c9 test and fix potential error with None optional relation
sylvain.thenault@logilab.fr
parents: 170
diff changeset
   553
        # UNION query, find the subquery from which this entity has been found
3016
5787d1cc8106 [rset] fix #231354 w/ rql 0.22.3 api
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2650
diff changeset
   554
        select = rqlst.locate_subquery(locate_query_col, etype, self.args)[0]
5787d1cc8106 [rset] fix #231354 w/ rql 0.22.3 api
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2650
diff changeset
   555
        col = rqlst.subquery_selection_index(select, col)
3766
9e5dc4b1ada4 work around a pb. with subquery_selection_index
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 3764
diff changeset
   556
        if col is None:
9e5dc4b1ada4 work around a pb. with subquery_selection_index
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 3764
diff changeset
   557
            # XXX unexpected, should fix subquery_selection_index ?
9e5dc4b1ada4 work around a pb. with subquery_selection_index
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 3764
diff changeset
   558
            return None, None
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   559
        try:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   560
            myvar = select.selection[col].variable
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   561
        except AttributeError:
572
9849fed789c9 test and fix potential error with None optional relation
sylvain.thenault@logilab.fr
parents: 170
diff changeset
   562
            # not a variable
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   563
            return None, None
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   564
        rel = myvar.main_relation()
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   565
        if rel is not None:
3016
5787d1cc8106 [rset] fix #231354 w/ rql 0.22.3 api
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2650
diff changeset
   566
            index = rel.children[0].root_selection_index()
572
9849fed789c9 test and fix potential error with None optional relation
sylvain.thenault@logilab.fr
parents: 170
diff changeset
   567
            if index is not None and self.rows[row][index]:
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   568
                return self.get_entity(row, index), rel.r_type
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   569
        return None, None
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   570
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   571
    @cached
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   572
    def searched_text(self):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   573
        """returns the searched text in case of full-text search
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   574
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   575
        :return: searched text or `None` if the query is not
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   576
                 a full-text query
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   577
        """
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   578
        rqlst = self.syntax_tree()
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   579
        for rel in rqlst.iget_nodes(nodes.Relation):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   580
            if rel.r_type == 'has_text':
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   581
                __, rhs = rel.get_variable_parts()
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   582
                return rhs.eval(self.args)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   583
        return None
1802
d628defebc17 delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 1477
diff changeset
   584
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   585
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   586
def attr_desc_iterator(rqlst, index=0):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   587
    """return an iterator on a list of 2-uple (index, attr_relation)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   588
    localizing attribute relations of the main variable in a result's row
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   589
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   590
    :type rqlst: rql.stmts.Select
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   591
    :param rqlst: the RQL syntax tree to describe
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   592
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   593
    :return:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   594
      a generator on (index, relation, target) describing column being
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   595
      attribute of the main variable
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   596
    """
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   597
    main = rqlst.selection[index]
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   598
    for i, term in enumerate(rqlst.selection):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   599
        if i == index:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   600
            continue
2352
734eb79680e9 handle attribute selection on variable selected using MAX()
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 1977
diff changeset
   601
        # XXX rewritten const
734eb79680e9 handle attribute selection on variable selected using MAX()
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 1977
diff changeset
   602
        # use iget_nodes for (hack) case where we have things like MAX(V)
734eb79680e9 handle attribute selection on variable selected using MAX()
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 1977
diff changeset
   603
        for vref in term.iget_nodes(nodes.VariableRef):
734eb79680e9 handle attribute selection on variable selected using MAX()
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 1977
diff changeset
   604
            var = vref.variable
734eb79680e9 handle attribute selection on variable selected using MAX()
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 1977
diff changeset
   605
            break
734eb79680e9 handle attribute selection on variable selected using MAX()
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 1977
diff changeset
   606
        else:
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   607
            continue
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   608
        for ref in var.references():
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   609
            rel = ref.relation()
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   610
            if rel is None or rel.is_types_restriction():
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   611
                continue
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   612
            lhs, rhs = rel.get_variable_parts()
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   613
            if main.is_equivalent(lhs):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   614
                if rhs.is_equivalent(term):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   615
                    yield (i, rel.r_type, 'subject')
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   616
            elif main.is_equivalent(rhs):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   617
                if lhs.is_equivalent(term):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   618
                    yield (i, rel.r_type, 'object')