bin/osv/expression.py

   1 #!/usr/bin/env python
   2 # -*- encoding: utf-8 -*-
   3 ##############################################################################
   4 #
   5 #    OpenERP, Open Source Management Solution
   6 #    Copyright (C) 2004-2009 Tiny SPRL (<http://tiny.be>). All Rights Reserved
   7 #    $Id$
   8 #
   9 #    This program is free software: you can redistribute it and/or modify
  10 #    it under the terms of the GNU General Public License as published by
  11 #    the Free Software Foundation, either version 3 of the License, or
  12 #    (at your option) any later version.
  13 #
  14 #    This program is distributed in the hope that it will be useful,
  15 #    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 #    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 #    GNU General Public License for more details.
  18 #
  19 #    You should have received a copy of the GNU General Public License
  20 #    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 #
  22 ##############################################################################
  23
  24 from tools import flatten, reverse_enumerate
  25 import fields
  26
  27
  28 class expression(object):
  29     """
  30     parse a domain expression
  31     use a real polish notation
  32     leafs are still in a ('foo', '=', 'bar') format
  33     For more info: http://christophe-simonis-at-tiny.blogspot.com/2008/08/new-new-domain-notation.html
  34     """
  35
  36     def _is_operator(self, element):
  37         return isinstance(element, (str, unicode)) and element in ['&', '|', '!']
  38
  39     def _is_leaf(self, element, internal=False):
  40         OPS = ('=', '!=', '<>', '<=', '<', '>', '>=', '=like', 'like', 'not like', 'ilike', 'not ilike', 'in', 'not in', 'child_of')
  41         INTERNAL_OPS = OPS + ('inselect',)
  42         return (isinstance(element, tuple) or isinstance(element, list)) \
  43            and len(element) == 3 \
  44            and (((not internal) and element[1] in OPS) \
  45                 or (internal and element[1] in INTERNAL_OPS))
  46
  47     def __execute_recursive_in(self, cr, s, f, w, ids):
  48         res = []
  49         for i in range(0, len(ids), cr.IN_MAX):
  50             subids = ids[i:i+cr.IN_MAX]
  51             cr.execute('SELECT "%s"'    \
  52                        '  FROM "%s"'    \
  53                        ' WHERE "%s" in (%s)' % (s, f, w, ','.join(['%s']*len(subids))),
  54                        subids)
  55             res.extend([r[0] for r in cr.fetchall()])
  56         return res
  57
  58
  59     def __init__(self, exp):
  60         # check if the expression is valid
  61         if not reduce(lambda acc, val: acc and (self._is_operator(val) or self._is_leaf(val)), exp, True):
  62             raise ValueError('Bad domain expression: %r' % (exp,))
  63         self.__exp = exp
  64         self.__tables = {}  # used to store the table to use for the sql generation. key = index of the leaf
  65         self.__joins = []
  66         self.__main_table = None # 'root' table. set by parse()
  67         self.__DUMMY_LEAF = (1, '=', 1) # a dummy leaf that must not be parsed or sql generated
  68
  69
  70     def parse(self, cr, uid, table, context):
  71         """ transform the leafs of the expression """
  72         if not self.__exp:
  73             return self
  74
  75         def _rec_get(ids, table, parent=None, left='id', prefix=''):
  76             if table._parent_store and (not table.pool._init):
  77 # TODO: Improve where joins are implemented for many with '.', replace by:
  78 # doms += ['&',(prefix+'.parent_left','<',o.parent_right),(prefix+'.parent_left','>=',o.parent_left)]
  79                 doms = []
  80                 for o in table.browse(cr, uid, ids, context=context):
  81                     if doms:
  82                         doms.insert(0, '|')
  83                     doms += ['&', ('parent_left', '<', o.parent_right), ('parent_left', '>=', o.parent_left)]
  84                 if prefix:
  85                     return [(left, 'in', table.search(cr, uid, doms, context=context))]
  86                 return doms
  87             else:
  88                 def rg(ids, table, parent):
  89                     if not ids:
  90                         return []
  91                     ids2 = table.search(cr, uid, [(parent, 'in', ids)], context=context)
  92                     return ids + rg(ids2, table, parent)
  93                 return [(left, 'in', rg(ids, table, parent or table._parent_name))]
  94
  95         self.__main_table = table
  96
  97         i = -1
  98         while i + 1<len(self.__exp):
  99             i += 1
 100             e = self.__exp[i]
 101             if self._is_operator(e) or e == self.__DUMMY_LEAF:
 102                 continue
 103             left, operator, right = e
 104
 105             working_table = table
 106             if left in table._inherit_fields:
 107                 working_table = table.pool.get(table._inherit_fields[left][0])
 108                 if working_table not in self.__tables.values():
 109                     self.__joins.append(('%s.%s=%s.%s' % (working_table._table, 'id', table._table, table._inherits[working_table._name]), working_table._table))
 110
 111             self.__tables[i] = working_table
 112
 113             fargs = left.split('.', 1)
 114             field = working_table._columns.get(fargs[0], False)
 115             if not field:
 116                 if left == 'id' and operator == 'child_of':
 117                     dom = _rec_get(right, working_table)
 118                     self.__exp = self.__exp[:i] + dom + self.__exp[i+1:]
 119                 continue
 120
 121             field_obj = table.pool.get(field._obj)
 122             if len(fargs) > 1:
 123                 if field._type == 'many2one':
 124                     right = field_obj.search(cr, uid, [(fargs[1], operator, right)], context=context)
 125                     self.__exp[i] = (fargs[0], 'in', right)
 126                 continue
 127
 128             if field._properties:
 129                 # this is a function field
 130                 if not field.store:
 131                     if not field._fnct_search:
 132                         # the function field doesn't provide a search function and doesn't store
 133                         # values in the database, so we must ignore it : we generate a dummy leaf
 134                         self.__exp[i] = self.__DUMMY_LEAF
 135                     else:
 136                         subexp = field.search(cr, uid, table, left, [self.__exp[i]])
 137                         # we assume that the expression is valid
 138                         # we create a dummy leaf for forcing the parsing of the resulting expression
 139                         self.__exp[i] = '&'
 140                         self.__exp.insert(i + 1, self.__DUMMY_LEAF)
 141                         for j, se in enumerate(subexp):
 142                             self.__exp.insert(i + 2 + j, se)
 143
 144                 # else, the value of the field is store in the database, so we search on it
 145
 146
 147             elif field._type == 'one2many':
 148                 if isinstance(right, basestring):
 149                     ids2 = [x[0] for x in field_obj.name_search(cr, uid, right, [], operator, limit=None)]
 150                 else:
 151                     ids2 = list(right)
 152                 if not ids2:
 153                     self.__exp[i] = ('id', '=', '0')
 154                 else:
 155                     self.__exp[i] = ('id', 'in', self.__execute_recursive_in(cr, field._fields_id, field_obj._table, 'id', ids2))
 156
 157             elif field._type == 'many2many':
 158                 #FIXME
 159                 if operator == 'child_of':
 160                     if isinstance(right, basestring):
 161                         ids2 = [x[0] for x in field_obj.name_search(cr, uid, right, [], 'like', limit=None)]
 162                     else:
 163                         ids2 = list(right)
 164
 165                     def _rec_convert(ids):
 166                         if field_obj == table:
 167                             return ids
 168                         return self.__execute_recursive_in(cr, field._id1, field._rel, field._id2, ids)
 169
 170                     dom = _rec_get(ids2, field_obj)
 171                     ids2 = field_obj.search(cr, uid, dom, context=context)
 172                     self.__exp[i] = ('id', 'in', _rec_convert(ids2))
 173                 else:
 174                     if isinstance(right, basestring):
 175                         res_ids = [x[0] for x in field_obj.name_search(cr, uid, right, [], operator)]
 176                     else:
 177                         res_ids = list(right)
 178                     self.__exp[i] = ('id', 'in', self.__execute_recursive_in(cr, field._id1, field._rel, field._id2, res_ids) or [0])
 179             elif field._type == 'many2one':
 180                 if operator == 'child_of':
 181                     if isinstance(right, basestring):
 182                         ids2 = [x[0] for x in field_obj.name_search(cr, uid, right, [], 'like', limit=None)]
 183                     else:
 184                         ids2 = list(right)
 185
 186                     self.__operator = 'in'
 187                     if field._obj != working_table._name:
 188                         dom = _rec_get(ids2, field_obj, left=left, prefix=field._obj)
 189                     else:
 190                         dom = _rec_get(ids2, working_table, parent=left)
 191                     self.__exp = self.__exp[:i] + dom + self.__exp[i+1:]
 192                 else:
 193                     if isinstance(right, basestring): # and not isinstance(field, fields.related):
 194                         c = context.copy()
 195                         c['active_test'] = False
 196                         res_ids = field_obj.name_search(cr, uid, right, [], operator, limit=None, context=c)
 197                         right = map(lambda x: x[0], res_ids)
 198                         self.__exp[i] = (left, 'in', right)
 199             else:
 200                 # other field type
 201                 if field.translate:
 202                     if operator in ('like', 'ilike', 'not like', 'not ilike'):
 203                         right = '%%%s%%' % right
 204
 205                     operator = operator == '=like' and 'like' or operator
 206
 207                     query1 = '( SELECT res_id'          \
 208                              '    FROM ir_translation'  \
 209                              '   WHERE name = %s'       \
 210                              '     AND lang = %s'       \
 211                              '     AND type = %s'
 212                     instr = ' %s'
 213                     #Covering in,not in operators with operands (%s,%s) ,etc.
 214                     if operator in ['in','not in']:
 215                         instr = ','.join(['%s'] * len(right))
 216                         query1 += '     AND value ' + operator +  ' ' +" (" + instr + ")"   \
 217                              ') UNION ('                \
 218                              '  SELECT id'              \
 219                              '    FROM "' + working_table._table + '"'       \
 220                              '   WHERE "' + left + '" ' + operator + ' ' +" (" + instr + "))"
 221                     else:
 222                         query1 += '     AND value ' + operator + instr +   \
 223                              ') UNION ('                \
 224                              '  SELECT id'              \
 225                              '    FROM "' + working_table._table + '"'       \
 226                              '   WHERE "' + left + '" ' + operator + instr + ")"
 227
 228                     query2 = [working_table._name + ',' + left,
 229                               context.get('lang', False) or 'en_US',
 230                               'model',
 231                               right,
 232                               right,
 233                              ]
 234
 235                     self.__exp[i] = ('id', 'inselect', (query1, query2))
 236
 237         return self
 238
 239     def __leaf_to_sql(self, leaf, table):
 240         if leaf == self.__DUMMY_LEAF:
 241             return ('(1=1)', [])
 242         left, operator, right = leaf
 243
 244         if operator == 'inselect':
 245             query = '(%s.%s in (%s))' % (table._table, left, right[0])
 246             params = right[1]
 247         elif operator in ['in', 'not in']:
 248             params = right[:]
 249             len_before = len(params)
 250             for i in range(len_before)[::-1]:
 251                 if params[i] == False:
 252                     del params[i]
 253
 254             len_after = len(params)
 255             check_nulls = len_after != len_before
 256             query = '(1=0)'
 257
 258             if len_after:
 259                 if left == 'id':
 260                     instr = ','.join(['%s'] * len_after)
 261                 else:
 262                     instr = ','.join([table._columns[left]._symbol_set[0]] * len_after)
 263                 query = '(%s.%s %s (%s))' % (table._table, left, operator, instr)
 264
 265             if check_nulls:
 266                 query = '(%s OR %s.%s IS NULL)' % (query, table._table, left)
 267         else:
 268             params = []
 269
 270             if right == False and (leaf[0] in table._columns)  and table._columns[leaf[0]]._type=="boolean"  and (operator == '='):
 271                 query = '(%s.%s IS NULL or %s.%s = false )' % (table._table, left,table._table, left)
 272             elif (((right == False) and (type(right)==bool)) or (right is None)) and (operator == '='):
 273                 query = '%s.%s IS NULL ' % (table._table, left)
 274             elif right == False and (leaf[0] in table._columns)  and table._columns[leaf[0]]._type=="boolean"  and (operator in ['<>', '!=']):
 275                 query = '(%s.%s IS NOT NULL and %s.%s != false)' % (table._table, left,table._table, left)
 276             elif (((right == False) and (type(right)==bool)) or right is None) and (operator in ['<>', '!=']):
 277                 query = '%s.%s IS NOT NULL' % (table._table, left)
 278             else:
 279                 if left == 'id':
 280                     query = '%s.id %s %%s' % (table._table, operator)
 281                     params = right
 282                 else:
 283                     like = operator in ('like', 'ilike', 'not like', 'not ilike')
 284
 285                     op = operator == '=like' and 'like' or operator
 286                     if left in table._columns:
 287                         format = like and '%s' or table._columns[left]._symbol_set[0]
 288                         query = '(%s.%s %s %s)' % (table._table, left, op, format)
 289                     else:
 290                         query = "(%s.%s %s '%s')" % (table._table, left, op, right)
 291
 292                     add_null = False
 293                     if like:
 294                         if isinstance(right, str):
 295                             str_utf8 = right
 296                         elif isinstance(right, unicode):
 297                             str_utf8 = right.encode('utf-8')
 298                         else:
 299                             str_utf8 = str(right)
 300                         params = '%%%s%%' % str_utf8
 301                         add_null = not str_utf8
 302                     elif left in table._columns:
 303                         params = table._columns[left]._symbol_set[1](right)
 304
 305                     if add_null:
 306                         query = '(%s OR %s IS NULL)' % (query, left)
 307
 308         if isinstance(params, basestring):
 309             params = [params]
 310         return (query, params)
 311
 312
 313     def to_sql(self):
 314         stack = []
 315         params = []
 316         for i, e in reverse_enumerate(self.__exp):
 317             if self._is_leaf(e, internal=True):
 318                 table = self.__tables.get(i, self.__main_table)
 319                 q, p = self.__leaf_to_sql(e, table)
 320                 params.insert(0, p)
 321                 stack.append(q)
 322             else:
 323                 if e == '!':
 324                     stack.append('(NOT (%s))' % (stack.pop(),))
 325                 else:
 326                     ops = {'&': ' AND ', '|': ' OR '}
 327                     q1 = stack.pop()
 328                     q2 = stack.pop()
 329                     stack.append('(%s %s %s)' % (q1, ops[e], q2,))
 330
 331         query = ' AND '.join(reversed(stack))
 332         joins = ' AND '.join(map(lambda j: j[0], self.__joins))
 333         if joins:
 334             query = '(%s) AND (%s)' % (joins, query)
 335         return (query, flatten(params))
 336
 337     def get_tables(self):
 338         return ['"%s"' % t._table for t in set(self.__tables.values()+[self.__main_table])]
 339
 340 # vim:expandtab:smartindent:tabstop=4:softtabstop=4:shiftwidth=4:
 341