Re: writing an assembler!

In article 98-07-005, "Dr Richard A. O'Keefe" <ok@atlas.otago.ac.nz> writes:
>
> These days, my language of choice for doing this would be Lisp or Ada
> (sensible macros are about *trees*, not strings!) but you can
> certainly use C as an assembler quite effectively.
> [It's a disgusting hack, but it's a great disgusting hack. -John]


You can get away with tree-like behavior in C if you use varargs stuff.
I'll risk my reputation (:-)) by admitting to an even more disgusting hack:
---
void new_section(char *title, char *img_name, int h, int w) {
        emit(html_list,
html_p,
html_hr,
html_br,
                        html_region, "center",
                                html_region, "h1",
html_text, title,
                        html_tag, "img",
html_param, "src", html_string, fname,
html_param, "height", html_text, h,
html_param, "width", html_text, w,
0,
                        0);
}
---


---
typedef void (*html_func)(va_list *);


void emit(html_func first, ...) {
        va_list ap;


        va_start(ap, first);
        (*first)(&ap);
        va_end(ap);
}


void html_list(va_list *ap) {
        html_func f;


        while (1) {
f = va_arg(ap, html_func);
if (f == 0) break;


(*f)(ap);
        }
}


[etc]
---


A disgusting hack? Absolutely.


But it's also an order of magnitude more powerful than any other
dynamic HTML tool I've worked with, and it only took me an hour or so
to implement.


---------------------------------------------------------------------------
Tim Hollebeek
email: tim@wfn-shop.princeton.edu
URL: http://wfn-shop.princeton.edu/~tim
[Wow, that's loathsome. I really like it. -John]




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