Coverage for local/lib/python2.7/site-packages/sage/structure/parent_base.pyx : 39%

r""" 

Base class for old-style parent objects with a base ring 

""" 

#***************************************************************************** 

# Copyright (C) 2006 William Stein <wstein@gmail.com> 

# 

# This program is free software: you can redistribute it and/or modify 

# it under the terms of the GNU General Public License as published by 

# the Free Software Foundation, either version 2 of the License, or 

# (at your option) any later version. 

# http://www.gnu.org/licenses/ 

#***************************************************************************** 

from __future__ import absolute_import 

cimport sage.structure.parent as parent 

from .coerce_exceptions import CoercionException 

cdef inline check_old_coerce(parent.Parent p): 

if p._element_constructor is not None: 

raise RuntimeError("%s still using old coercion framework" % p) 

def is_ParentWithBase(x): 

""" 

Return True if x is a parent object with base. 

""" 

return isinstance(x, ParentWithBase) 

cdef class ParentWithBase(Parent_old): 

""" 

This class is being deprecated, see parent.Parent for the new model. 

""" 

def __init__(self, base, *args, **kwds): 

Parent_old.__init__(self, *args, **kwds) 

self._base = base 

cdef _coerce_c_impl(self,x): 

check_old_coerce(self) 

if not self._base is self: 

return self._coerce_try(x,(self._base)) 

else: 

raise TypeError("No canonical coercion found.") 

# Derived class *must* define base_extend. 

def base_extend(self, X): 

check_old_coerce(self) 

raise CoercionException("BUG: the base_extend method must be defined for '%s' (class '%s')" % 

(self, type(self)))