Let the user parse a file from the Python API.

[dareg]

For now, parsing file containing preprocessors directives through the python API seems broken.
For instance with this file:

subroutine f()
#ifdef FOO
if(.true.)then
#else
if(.false.)then
#endif
endif
end subroutine f

It works fine when using fxtran, but when using the python wrapper the parsing fail:

Traceback (most recent call last):
  File "/tmp/fxtran/main.py", line 8, in <module>
    xml=fxtran.run('-canonic','-DFOO','-cpp',code)
fxtran.error: 
E.</literal-E></condition-E>) THEN</if-then-stmt>
<cpp>#endif</cpp>
<end-if-stmt>ENDIF</end-if-stmt>
At FXTRAN_STMT.c:3200
Unexpected end-subroutine-stmt statement
      | 0         1         2         3         4         5         6         7         

    5 | if(.false.)then
    6 | #endif
    7 | endif
    8 | end subroutine f
            ^

The problem seems to arise because the code is never preprocessed. Indeed, when FXTRAN_RUN is called with the 'Text' variable being not NULL, the preprocessor is never called. The preprocessor is only called when a file is given.
In consequence this problem can be fixed in the Python API by letting the user provide a file instead of a string containing the code. It will be then fxtran's job to open the file and fxtran will preprocess it.

It also ease the use of the Python API since the user don't have to open a file and read it on the python side just to give it to fxtran. The user can now just give a filename and get the resulting xml.

[pmarguinaud]

Hello Judicaël,

I would like the python interface not to enable cpp; the reason is that I cannot reset cpp (it allocates memory and has global variables). In fact the python interface is intended to parse small bits of Fortran (it would be expensive to call the fxtran executable for each small bit).
But for full files (with or without cpp pre-processing), the most desirable fashion is to to invoke the fxtran executable.

And yes, if you do not enable the cpp pre-processor, the result should be valid Fortran, with consistent if/then/else blocks, etc.

So either your invoke the fxtran executable, or you pre-process your code yourself before passing to to the python interface.

Hope this helps.