This is a python-style preprocessor for C and C++.  It should be run to produce
a C or C++ source file, which can then be compiled with gcc/g++.

A simple source file looks like this:

# pypp 0
/* The previous line must be the first one in the file.  It specifies the
 * required version of pypp to use for processing it. */
#include <stdio.h>

struct foo:
	int a
	char *text

enum direction:
	north
	east
	south
	west

int main (int argc, char **argv):
	if argc < 2:
		printf ("hello, world.\n")
		return 0
	else:
		for i = 1; i < argc; ++i:
			printf ("argument %d is %s.\n", i, argv[i])
		return argc

The indentation specifies that something is a block.  Only one statement per
line is allowed.  No semicolons are needed (or allowed), except in the argument
of a for instruction.

MISSING FEATURES
****************
- calling a function python-style should be possible
- nested functions
- change else so it needs nobreak instead of break
- break num/continue num
- debugging features (startfunc, endfunc) would be nice