rset.py
author Julien Jehannet <julien.jehannet@logilab.fr>
Fri, 16 Jan 2009 20:03:58 +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: 2001-2008 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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"""
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__docformat__ = "restructuredtext en"
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from logilab.common.decorators import cached, clear_cache, copy_cache
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from rql import nodes
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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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    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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        if not self.description:
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            return '<resultset %r: %s>' % (self.rql, '\n'.join(str(r) for r in self.rows))
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        return '<resultset %r: %s>' % (self.rql,
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                                       '\n'.join('%s (%s)' % (r, d)
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                                                 for r, d in zip(self.rows, self.description)))
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    @cached
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    def possible_actions(self):
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        return self.vreg.possible_vobjects('actions', self.req, self)
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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 _prepare_copy(self, rows, descr):
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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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        :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._prepare_copy(rows, descr)
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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._prepare_copy(rows, descr)
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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._prepare_copy(rows, descr)
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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, entity in entities:
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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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        :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)
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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._prepare_copy(rows, descr)
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                mapping[key] = rset
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                result.append(rset)
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            else:
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                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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        for rset in result:
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            rset.rowcount = len(rset.rows)
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   230
        if return_dict:
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            return mapping
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        else:
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            return result
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    def limit(self, limit, offset=0, inplace=False):
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        """limit the result set to the given number of rows optionaly starting
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        from an index different than 0
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        :type limit: int
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        :param limit: the maximum number of results
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        :type offset: int
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        :param offset: the offset index
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        :type inplace: bool
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        :param inplace:
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          if true, the result set is modified in place, else a new result set
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          is returned and the original is left unmodified
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        :rtype: `ResultSet`
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   251
        """
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        stop = limit+offset
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        rows = self.rows[offset:stop]
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        descr = self.description[offset:stop]
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   255
        if inplace:
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   256
            rset = self
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            rset.rows, rset.description = rows, descr
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            rset.rowcount = len(rows)
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   259
            clear_cache(rset, 'description_struct')
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   260
            if offset:
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   261
                clear_cache(rset, 'get_entity')
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   262
            # we also have to fix/remove from the request entity cache entities
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   263
            # which get a wrong rset reference by this limit call
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   264
            for entity in self.req.cached_entities():
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   265
                if entity.rset is self:
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   266
                    if offset <= entity.row < stop:
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                        entity.row = entity.row - offset
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                    else:
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   269
                        self.req.drop_entity_cache(entity.eid)
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   270
        else:
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   271
            rset = self._prepare_copy(rows, descr)
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   272
            if not offset:
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   273
                # can copy built entity caches
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   274
                copy_cache(rset, 'get_entity', self)
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   275
        rset.limited = (limit, offset)
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   276
        return rset
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   277
    
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   278
    def printable_rql(self, encoded=False):
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   279
        """return the result set's origin rql as a string, with arguments
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   280
        substitued
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   281
        """
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   282
        encoding = self.req.encoding
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   283
        rqlstr = self.syntax_tree().as_string(encoding, self.args)
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   284
        # sounds like we get encoded or unicode string due to a bug in as_string
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   285
        if not encoded:
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   286
            if isinstance(rqlstr, unicode):
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   287
                return rqlstr
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   288
            return unicode(rqlstr, encoding)
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   289
        else: 
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   290
            if isinstance(rqlstr, unicode):
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   291
                return rqlstr.encode(encoding)
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   292
            return rqlstr
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   293
       
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   294
    # client helper methods ###################################################
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   295
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   296
    def entities(self, col=0):
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   297
        """iter on entities with eid in the `col` column of the result set"""
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   298
        for i in xrange(len(self)):
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   299
            # may have None values in case of outer join (or aggregat on eid
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   300
            # hacks)
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   301
            if self.rows[i][col] is not None:
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   302
                yield self.get_entity(i, col)
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   303
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   304
    @cached
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diff changeset
   305
    def get_entity(self, row, col=None):
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   306
        """special method for query retreiving a single entity, returns a
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   307
        partially initialized Entity instance.
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diff changeset
   308
        
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   309
        WARNING: due to the cache wrapping this function, you should NEVER
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   310
                 give row as a named parameter (i.e. rset.get_entity(req, 0)
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   311
                 is OK but rset.get_entity(row=0, req=req) isn't
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diff changeset
   312
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   313
        :type row,col: int, int
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   314
        :param row,col:
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diff changeset
   315
          row and col numbers localizing the entity among the result's table
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parents:
diff changeset
   316
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   317
        :return: the partially initialized `Entity` instance
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parents:
diff changeset
   318
        """
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parents:
diff changeset
   319
        if col is None:
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parents:
diff changeset
   320
            from warnings import warn
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parents:
diff changeset
   321
            msg = 'col parameter will become mandatory in future version'
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parents:
diff changeset
   322
            warn(msg, DeprecationWarning, stacklevel=3)
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parents:
diff changeset
   323
            col = 0
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   324
        etype = self.description[row][col]
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   325
        try:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   326
            eschema = self.vreg.schema.eschema(etype)
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parents:
diff changeset
   327
            if eschema.is_final():
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parents:
diff changeset
   328
                raise NotAnEntity(etype)
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parents:
diff changeset
   329
        except KeyError:
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parents:
diff changeset
   330
            raise NotAnEntity(etype)
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parents:
diff changeset
   331
        return self._build_entity(row, col)
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parents:
diff changeset
   332
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parents:
diff changeset
   333
    def _build_entity(self, row, col, _localcache=None):
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parents:
diff changeset
   334
        """internal method to get a single entity, returns a
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   335
        partially initialized Entity instance.
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parents:
diff changeset
   336
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diff changeset
   337
        partially means that only attributes selected in the RQL
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   338
        query will be directly assigned to the entity.
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parents:
diff changeset
   339
        
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diff changeset
   340
        :type row,col: int, int
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diff changeset
   341
        :param row,col:
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parents:
diff changeset
   342
          row and col numbers localizing the entity among the result's table
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parents:
diff changeset
   343
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diff changeset
   344
        :return: the partially initialized `Entity` instance
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   345
        """
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   346
        req = self.req
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diff changeset
   347
        if req is None:
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parents:
diff changeset
   348
            raise AssertionError('dont call get_entity with no req on the result set')
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   349
        rowvalues = self.rows[row]
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   350
        eid = rowvalues[col]
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   351
        assert eid is not None
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parents:
diff changeset
   352
        # return cached entity if exists. This also avoids potential recursion
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   353
        # XXX should we consider updating a cached entity with possible
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   354
        #     new attributes found in this resultset ?
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   355
        try:
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parents:
diff changeset
   356
            if hasattr(req, 'is_super_session'):
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parents:
diff changeset
   357
                # this is a Session object which is not caching entities, so we
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parents:
diff changeset
   358
                # have to use a local cache to avoid recursion pb
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   359
                if _localcache is None:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   360
                    _localcache = {}
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   361
                return _localcache[eid]
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   362
            else:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   363
                return req.entity_cache(eid)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   364
        except KeyError:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   365
            pass
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   366
        # build entity instance
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   367
        etype = self.description[row][col]
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   368
        entity = self.vreg.etype_class(etype)(req, self, row, col)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   369
        entity.set_eid(eid)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   370
        # cache entity
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   371
        if _localcache is not None:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   372
            _localcache[eid] = entity
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   373
        req.set_entity_cache(entity)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   374
        eschema = entity.e_schema
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   375
        # try to complete the entity if there are some additional columns
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   376
        if len(rowvalues) > 1:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   377
            rqlst = self.syntax_tree()
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   378
            if rqlst.TYPE == 'select':
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   379
                # UNION query, find the subquery from which this entity has been
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   380
                # found
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   381
                rqlst = rqlst.locate_subquery(col, etype, self.args)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   382
            # take care, due to outer join support, we may find None
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   383
            # values for non final relation
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   384
            for i, attr, x in attr_desc_iterator(rqlst, col):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   385
                if x == 'subject':
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   386
                    rschema = eschema.subject_relation(attr)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   387
                    if rschema.is_final():
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   388
                        entity[attr] = rowvalues[i]
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   389
                        continue
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   390
                    tetype = rschema.objects(etype)[0]
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   391
                    card = rschema.rproperty(etype, tetype, 'cardinality')[0]
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   392
                else:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   393
                    rschema = eschema.object_relation(attr)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   394
                    tetype = rschema.subjects(etype)[0]
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   395
                    card = rschema.rproperty(tetype, etype, 'cardinality')[1]
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   396
                # only keep value if it can't be multivalued
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   397
                if card in '1?':
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   398
                    if rowvalues[i] is None:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   399
                        if x == 'subject':
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   400
                            rql = 'Any Y WHERE X %s Y, X eid %s'
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   401
                        else:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   402
                            rql = 'Any Y WHERE Y %s X, X eid %s'
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   403
                        rrset = ResultSet([], rql % (attr, entity.eid))
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   404
                        req.decorate_rset(rrset)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   405
                    else:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   406
                        rrset = self._build_entity(row, i, _localcache).as_rset()
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   407
                    entity.set_related_cache(attr, x, rrset)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   408
        return entity
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   409
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   410
    @cached
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   411
    def syntax_tree(self):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   412
        """get the syntax tree for the source query. 
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   413
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   414
        :rtype: rql.stmts.Statement
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   415
        :return: the RQL syntax tree of the originating query
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
        if self._rqlst:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   418
            rqlst = self._rqlst.copy()
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   419
            # to avoid transport overhead when pyro is used, the schema has been
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   420
            # unset from the syntax tree
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   421
            rqlst.schema = self.vreg.schema
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   422
            self.vreg.rqlhelper.annotate(rqlst)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   423
        else:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   424
            rqlst = self.vreg.parse(self.req, self.rql, self.args)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   425
        return rqlst
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   426
        
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   427
    @cached
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   428
    def column_types(self, col):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   429
        """return the list of different types in the column with the given col
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   430
        index default to 0 (ie the first column)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   431
        
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   432
        :type col: int
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   433
        :param col: the index of the desired column
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   434
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   435
        :rtype: list
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   436
        :return: the different entities type found in the column
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   437
        """
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   438
        return frozenset(struc[-1][col] for struc in self.description_struct())
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   439
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   440
    @cached
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   441
    def description_struct(self):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   442
        """return a list describing sequence of results with the same
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   443
        description, e.g. :
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   444
        [[0, 4, ('Bug',)]
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   445
        [[0, 4, ('Bug',), [5, 8, ('Story',)]
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   446
        [[0, 3, ('Project', 'Version',)]]
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   447
        """
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   448
        result = []
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   449
        last = None
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   450
        for i, row in enumerate(self.description):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   451
            if row != last:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   452
                if last is not None:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   453
                    result[-1][1] = i - 1
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   454
                result.append( [i, None, row] )
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   455
                last = row
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   456
        if last is not None:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   457
            result[-1][1] = i
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   458
        return result
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   459
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   460
    @cached
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   461
    def related_entity(self, row, col):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   462
        """try to get the related entity to extract format information if any"""
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   463
        locate_query_col = col
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   464
        rqlst = self.syntax_tree()
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   465
        etype = self.description[row][col]
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   466
        if self.vreg.schema.eschema(etype).is_final():
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   467
            # final type, find a better (ambiguous) one
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   468
            for i in xrange(len(rqlst.children[0].selection)):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   469
                if i == col:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   470
                    continue
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   471
                coletype = self.description[row][i]
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   472
                if coletype is None:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   473
                    continue
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   474
                if not self.vreg.schema.eschema(coletype).is_final():
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   475
                    etype = coletype
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   476
                    locate_query_col = i
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   477
                    if len(self.column_types(i)) > 1:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   478
                        break
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   479
        # UNION query, find the subquery from which this entity has been
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   480
        # found
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   481
        select = rqlst.locate_subquery(locate_query_col, etype, self.args)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   482
        try:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   483
            myvar = select.selection[col].variable
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   484
        except AttributeError:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   485
            # no .selection attribute is available
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   486
            return None, None
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   487
        rel = myvar.main_relation()
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   488
        if rel is not None:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   489
            index = rel.children[0].variable.selected_index()
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   490
            if index is not None:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   491
                return self.get_entity(row, index), rel.r_type
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   492
        return None, None
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   493
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   494
    @cached
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   495
    def searched_text(self):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   496
        """returns the searched text in case of full-text search
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   497
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   498
        :return: searched text or `None` if the query is not
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   499
                 a full-text query
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   500
        """
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   501
        rqlst = self.syntax_tree()
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   502
        for rel in rqlst.iget_nodes(nodes.Relation):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   503
            if rel.r_type == 'has_text':
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   504
                __, rhs = rel.get_variable_parts()
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   505
                return rhs.eval(self.args)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   506
        return None
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
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   509
def attr_desc_iterator(rqlst, index=0):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   510
    """return an iterator on a list of 2-uple (index, attr_relation)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   511
    localizing attribute relations of the main variable in a result's row
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
    :type rqlst: rql.stmts.Select
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   514
    :param rqlst: the RQL syntax tree to describe
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   515
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   516
    :return:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   517
      a generator on (index, relation, target) describing column being
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   518
      attribute of the main variable
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   519
    """
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   520
    main = rqlst.selection[index]
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   521
    for i, term in enumerate(rqlst.selection):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   522
        if i == index:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   523
            continue
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   524
        try:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   525
            # XXX rewritten const
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   526
            var = term.variable
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   527
        except AttributeError:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   528
            continue
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   529
        #varname = var.name
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   530
        for ref in var.references():
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   531
            rel = ref.relation()
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   532
            if rel is None or rel.is_types_restriction():
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   533
                continue
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   534
            lhs, rhs = rel.get_variable_parts()
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   535
            if main.is_equivalent(lhs):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   536
                if rhs.is_equivalent(term):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   537
                    yield (i, rel.r_type, 'subject')
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   538
            elif main.is_equivalent(rhs):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   539
                if lhs.is_equivalent(term):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   540
                    yield (i, rel.r_type, 'object')