[fpc-devel] Macro Processing

[Sven Barth]

On 13.05.2011 15:55, Hans-Peter Diettrich wrote:
> Traditional Pascal added compiler directives, hidden inside comments.
> It's only a matter of performance, whether these directives should be
> handled immediately at detection of a comment, or after a comment has
> been fully recognized (skipped) by the scanner. Conditional compilation
> also can be implemented outside the scanner, with optional feedback
> instructing the scanner to *not* apply special processing to tokens
> which are skipped by conditional directives. Include directives require
> more support in the scanner, which then must be capable of switching
> between multiple input streams. Macros can be implemented in the same
> way, but it will be more efficient to Record and Replay token streams
> instead of character streams. This recorder also can be implemented
> outside the scanner, an according filter will either return a previously
> recorded token, or else it asks the scanner for the next token.
>

There is already a token recorder/replayer: the one that is used for 
generics.

Regards,
Sven