Use C preprocessor macros (just the constants) as Python variables

Question

I am writing a Python code which needs to interoperate with C code which I also wrote. In C I have a section like

#define FOO 23    // whatever
#define BAR 54.3  // something else

I want to use these in python (as regular variables is fine). I am not finding anything in my web searches, and I could easily write a parser myself, but.... I can't believe I am the first one with such a need. PyPreprocessor comes close, but not exactly.

Is there a obvious way to do so which I am missing?

Answer 1

Maybe it's overkill, but you could use parser from dissect.cstruct module.

It currently supports plain preprocessor defines and simple expressions like #define TWO (ONE+1) , but don't support conditionals like #if and #ifdef.

Code example

from dissect.cstruct import cstruct    

defs_str = """
#define FOO 23    // whatever
#define BAR 54.3  // something else
"""

c = cstruct()
c.load(defs_str)
print(c.consts)  # => {'FOO': 23, 'BAR': 54.3}
print(c.FOO)     # => 23
print(c.BAR)     # => 54.3