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'''
gMathLib, mathematic expressions handling library
# Python bindings
Author : Guillaume Seguin
Email : guillaume@segu.in
Copyright (c) 2007 Guillaume Seguin <guillaume@segu.in>
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.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
'''
ctypedef unsigned int bool
cdef extern from 'string.h':
ctypedef int size_t
cdef extern char *strdup (char *s)
cdef extern void free (void *f)
ctypedef char gchar
cdef extern from "glib.h":
ctypedef struct GData
cdef extern from "Python.h":
object PyString_FromStringAndSize (char *string, int size)
cdef struct GMathContext
cdef struct GMathModule
cdef struct GMathFormula
cdef struct GMathTemplate
cdef struct GMathSymbol
cdef struct GMathContext:
GData *templates
GData *input_modules
GData *output_modules
cdef struct GMathFormula:
GMathContext *context
GMathSymbol *root
cdef struct GMathTemplate:
bool has_value
unsigned int children_count
cdef struct GMathSymbol:
gchar *type
gchar *value
GMathSymbol **children
GMathSymbol *parent
GMathTemplate *template
GMathContext *context
cdef extern GMathContext* gmathcontext_new ()
cdef extern void gmathcontext_free (GMathContext *context)
cdef extern GMathModule* gmathcontext_get_input_module (GMathContext *context,
gchar *name)
cdef extern GMathModule* gmathcontext_get_output_module (GMathContext *context,
gchar *name)
cdef extern bool gmathcontext_load_input_module (GMathContext *context,
gchar *name)
cdef extern bool gmathcontext_load_output_module (GMathContext *context,
gchar *name)
cdef extern GMathFormula* gmathcontext_import (GMathContext *context,
gchar *module,
gchar *data)
cdef extern GMathFormula* gmathformula_new (GMathContext *context)
cdef extern void gmathformula_free (GMathFormula *formula)
cdef extern void gmathformula_set_root (GMathFormula *formula,
GMathSymbol *symbol)
cdef extern size_t gmathformula_export (GMathFormula *formula, gchar *module,
gchar **data)
cdef extern GMathSymbol* gmathsymbol_new (GMathContext *context, gchar *type)
cdef extern void gmathsymbol_free (GMathSymbol *symbol)
cdef extern void gmathsymbol_set_value (GMathSymbol *symbol, gchar *value)
cdef extern void gmathsymbol_set_child (GMathSymbol *symbol,
GMathSymbol *child, int index)
cdef extern GMathSymbol* gmathsymbol_get_child (GMathSymbol *symbol,
int index)
cdef class Symbol:
cdef GMathSymbol *csymbol
cdef object context
cdef object children
def __new__ (self, context, type = "", symbol = None):
cdef GMathSymbol *child
self.context = context
if symbol:
self.csymbol = <GMathSymbol *> symbol
elif type:
self.csymbol = \
gmathsymbol_new (<GMathContext *> self.context.c_context, type)
self.children = []
for i in range (0, self.csymbol.template.children_count):
child = gmathsymbol_get_child (self.csymbol, i)
if not child:
self.children.append (None)
continue
self.children.append (Symbol (context, symbol = <object> child))
def set_child (self, child, index):
if index >= self.csymbol.template.children_count:
return
self.children[index] = child
gmathsymbol_set_child (self.csymbol, <GMathSymbol *> child.c_symbol,
index)
def free (self):
gmathsymbol_free (self.csymbol)
self.csymbol = NULL
def __dealloc__ (self):
self.free ()
property value:
def __get__ (self):
return str (<object> self.csymbol.value)
def __set__ (self, value):
gmathsymbol_set_value (self.csymbol, value)
property c_symbol:
def __get__ (self):
return <object> self.csymbol
cdef class Formula:
cdef GMathFormula *cformula
cdef object context
cdef object root
def __new__ (self, context, formula = None):
self.context = context
self.context.register_formula (self)
if formula:
self.cformula = <GMathFormula *> formula
else:
self.cformula = \
gmathformula_new (<GMathContext *> self.context.c_context)
if self.cformula.root != NULL:
self.root = Symbol (<object> self.cformula.root)
else:
self.root = None
def free (self):
if self.root:
self.root.free ()
self.set_root (None)
gmathformula_free (self.cformula)
def __dealloc__ (self):
self.free ()
def set_root (self, root):
if root:
gmathformula_set_root (self.cformula, <GMathSymbol *> root.c_symbol)
else:
gmathformula_set_root (self.cformula, <GMathSymbol *> NULL)
self.root = root
def export (self):
cdef gchar *cdata
cdef size_t size
if not self.context.output_module:
print "Error: please load or select an output module."
return None
size = gmathformula_export (self.cformula, self.context.output_module,
&cdata)
if not size:
return None
data = PyString_FromStringAndSize (cdata, size)
free (cdata)
return data
property c_formula:
def __get__ (self):
return <object> self.cformula
cdef class Context:
cdef GMathContext *ccontext
cdef object _input_module
cdef object _output_module
cdef object formulas
def __new__ (self):
self.ccontext = gmathcontext_new ()
self.input_module = None
self.output_module = None
self.formulas = []
def __dealloc__ (self):
for formula in self.formulas:
formula.free ()
gmathcontext_free (self.ccontext)
def load_input_module (self, name):
gmathcontext_load_input_module (self.ccontext, name)
def load_output_module (self, name):
gmathcontext_load_output_module (self.ccontext, name)
def import_from_data (self, data):
if not self.input_module:
print "Error: please load or select an input module."
return None
cdef GMathFormula *formula
formula = gmathcontext_import (self.ccontext, self.input_module, data)
if formula == NULL:
return None
return Formula (self, <object> formula)
def register_formula (self, formula):
self.formulas.append (formula)
def Formula (self):
return Formula (self)
def Symbol (self, type = "", symbol = None):
return Symbol (self, type, symbol)
property input_module:
def __get__ (self):
return self._input_module
def __set__ (self, name):
if name and not gmathcontext_get_input_module (self.ccontext,
name):
self.load_input_module (name)
if not gmathcontext_get_input_module (self.ccontext, name):
print "Error: %s input module not found." % name
return
self._input_module = name
property output_module:
def __get__ (self):
return self._output_module
def __set__ (self, name):
if name and not gmathcontext_get_output_module (self.ccontext,
name):
self.load_output_module (name)
if not gmathcontext_get_output_module (self.ccontext, name):
print "Error: %s output module not found." % name
return
self._output_module = name
property c_context:
def __get__ (self):
return <object> self.ccontext
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