Fix ccode for sympy<1.7 compatibility

hysop/backend/device/codegen/symbolic/expr.py

+from hysop.backend.device.opencl.opencl_types import basetype as cl_basetype, \
+    components as cl_components, \
+    vtype as cl_vtype
+from hysop.backend.device.codegen.base.variables import ctype_to_dtype
 import sympy as sm
 from hysop.symbolic import Symbol, Expr
 from hysop.symbolic.array import OpenClSymbolicBuffer, OpenClSymbolicNdBuffer
 from hysop.tools.types import check_instance, first_not_None, to_tuple, to_list
 from hysop.tools.numerics import is_fp, is_signed, is_unsigned, is_integer, is_complex
-from sympy.printing.c import C99CodePrinter
 
-from hysop.backend.device.codegen.base.variables import ctype_to_dtype
-from hysop.backend.device.opencl.opencl_types import basetype as cl_basetype, \
-    components as cl_components, \
-    vtype as cl_vtype
+from packaging import version
+if version.parse(sp.__version__) > version.parse("1.7"):
+    from sympy.printing.c import C99CodePrinter
+else:
+    from sympy.printing.ccode import C99CodePrinter
+
 
 InstructionTermination = ''
 

hysop/backend/device/opencl/opencl_printer.py

-import sympy as sm
-from sympy.printing.c import C99CodePrinter
-from hysop.tools.types import check_instance
 from hysop.backend.device.opencl.opencl_types import OpenClTypeGen
+from hysop.tools.types import check_instance
+import sympy as sm
+from packaging import version
+if version.parse(sp.__version__) > version.parse("1.7"):
+    from sympy.printing.c import C99CodePrinter
+else:
+    from sympy.printing.ccode import C99CodePrinter
 
 # /!\ TODO complete known_functions list with OpenCL builtins
 # - keys are sympy function names (beware to capital letters)

hysop/tools/field_utils.py

@@ -5,8 +5,12 @@ from hysop.tools.sympy_utils import nabla, partial, subscript, subscripts, \
     exponent, exponents, xsymbol, get_derivative_variables
 
 from sympy.printing.str import StrPrinter, StrReprPrinter
-from sympy.printing.c import C99CodePrinter
 from sympy.printing.latex import LatexPrinter
+from packaging import version
+if version.parse(sp.__version__) > version.parse("1.7"):
+    from sympy.printing.c import C99CodePrinter
+else:
+    from sympy.printing.ccode import C99CodePrinter
 
 
 class BasePrinter(object):