Show HN: Yupp, yet another C preprocessor

Re:Show HN: Yupp, yet another C preprocessor by fizixer on Tuesday September 15, 2015 @03:37PM (#10222692)

Technically, this is not a C preprocessor, more like a general-purpose macro processor, since you're using it as a third layer (second being C macros, first being C itself) instead of replacing C macros.

Although it gives me an idea, a converter that takes a valid C program (with macros) and replaces the C macros with some other macros (in this case yupp macros) that perform the same task. e.g.,

replacing

#include <stdio.h>

with something like:

($include "stdio.h")

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Re:Show HN: Yupp, yet another C preprocessor by in4lio on Tuesday September 15, 2015 @06:36PM (#10223583)

Yes, you are right. Since yupp is a third layer, yupp is able to generate C macros, for example:

  ($define,,assert_bit_mask( value, mask, op ),,($do ]
      bool test = ((( value ) & ( mask )) == ( mask ));
      if ( !test ) {
          ut_fault( "expected mask to be set", __FILE__,  __FUNCTION__, __LINE__ );
          op;
      }
  [ ))

will result in:

  #define assert_bit_mask( value, mask, op ) do { \
      bool test = ((( value ) & ( mask )) == ( mask )); \
      if ( !test ) { \
          ut_fault( "expected mask to be set", __FILE__,  __FUNCTION__, __LINE__ ); \
          op; \
      } \
  } while ( 0 )

but you don't need to think about backslashes)

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Re:Show HN: Yupp, yet another C preprocessor by leni536 on Tuesday September 15, 2015 @04:13PM (#10222865)

My first thought as well. Why restrict to C? It could be useful for many other languages.

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Re:Show HN: Yupp, yet another C preprocessor by in4lio on Tuesday September 15, 2015 @07:00PM (#10223665)

Just because C is my primary tool) and I have created yupp, to do things like X Macros simpler.

yupp can even be used with Python, as it allows to make the right indentation, e.g. https://github.com/in4lio/yupp/blob/master/eg/dict.yu-py

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