Lets say we use type-checked Lua (possibly in a special mode), since that aids new parsing techniques. And allows us to reuse the scanner I designed for parsing Lua, inlining those routines. Wrapped in a routine to track line number & filename, which can be set via the #line directive.

Getting back to lexing... GLSL has similar lexing rules to C, except we don't have strings. Too high-level for GLSL!

That is we split the file into numbers, identifiers & keywords, symbols, & punctuation.

2/3!

Lets say we use type-checked Lua (possibly in a special mode), since that aids new parsing techniques. And allows us to reuse the scanner I designed for parsing Lua, inlining those routines. Wrapped in a routine to track line number & filename, which can be set via the #line directive.

Getting back to lexing... GLSL has similar lexing rules to C, except we don't have strings. Too high-level for GLSL!

That is we split the file into numbers, identifiers & keywords, symbols, & punctuation.

2/3!

GLSL, OpenGL's standard language for programs ran on the GPU, includes what closely resembles C's preprocessor. So how'd we reimplement this for our risc32cfimv?

Incidentally GLSL specifically excludes #include, so (using the hardware I introduced the other day) we could run on this on a ROM-bank without filesystem routines. But #include sounds handy so I'm tempted to suggest that I'd implement it anyways!

In which case I'd love #line to be handled later, & even synthesize new ones.

1/?

#define would extract the identifier & parse the following optional argument list & body removing (escaped) newlines to load into a "macro" table.

Non-preprocessor lines would be scanned for these macros' identifiers to perform a find & replace, recursing to handle substitute in parameters.

2/3?

I'd track a stack of control-flow preprocessor lines tracking whether to keep or discard the lines between them, inserting #line where needed. This is how I'd handle #if, #elif, #else, #endif, #ifdef, #ifndef, #elifdef, #elifndef.

Some of these take identifiers whose presence it should check in the macros table, others would interpret infix expressions via a couple stacks & The Shunting Yard Algorithm. Or they simply end a control-flow block.

#undef removes an entry from the macros table.

3/4

I'd track a stack of control-flow preprocessor lines tracking whether to keep or discard the lines between them, inserting #line where needed. This is how I'd handle #if, #elif, #else, #endif, #ifdef, #ifndef, #elifdef, #elifndef.

Some of these take identifiers whose presence it should check in the macros table, others would interpret infix expressions via a couple stacks & The Shunting Yard Algorithm. Or they simply end a control-flow block.

#undef removes an entry from the macros table.

3/4

#define would extract the identifier & parse the following optional argument list & body removing (escaped) newlines to load into a "macro" table.

Non-preprocessor lines would be scanned for these macros' identifiers to perform a find & replace, recursing to handle substitute in parameters.

2/3?

GLSL, OpenGL's standard language for programs ran on the GPU, includes what closely resembles C's preprocessor. So how'd we reimplement this for our risc32cfimv?

Incidentally GLSL specifically excludes #include, so (using the hardware I introduced the other day) we could run on this on a ROM-bank without filesystem routines. But #include sounds handy so I'm tempted to suggest that I'd implement it anyways!

In which case I'd love #line to be handled later, & even synthesize new ones.

1/?

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