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Support nested comments in uxnasm.

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Previously, code like this would fail with an error
about an unrecognized ) token:

    ( this is a ( nested ) comment )

With this patch, the above code will now work.

Relatedly, it was previously possible to write code
that compiled but was confusing:

    (open parenthesis should have a space )
    ( in this case the ADD2 will be ignored )ADD2
    ( this comment with ( would have been fine )

With this commit, the first example will emit a warning
but continue to work as intended. The second and third
examples will continue searching for a matching ) token,
which due to the new nested coment behavior will probably
mean the rest of the file gets commented out.
This commit is contained in:
Erik Osheim 2021-12-28 21:38:05 -05:00 committed by neauoire
parent 55f448fb77
commit abd6a3a5da
1 changed files with 7 additions and 2 deletions
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9
src/uxnasm.c
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@ -243,8 +243,13 @@ parse(char *w, FILE *f)
return error("Invalid token", w);
switch(w[0]) {
case '(': /* comment */
while(fscanf(f, "%63s", word) == 1)
if(word[0] == ')') break;
if(slen(w) != 1) fprintf(stderr, "-- Malformed comment: %s\n", w);
i = 1; /* track nested comment depth */
while(fscanf(f, "%63s", word) == 1) {
if(slen(word) != 1) continue;
else if(word[0] == '(') i++;
else if(word[0] == ')' && --i < 1) break;
}
break;
case '~': /* include */
if(!doinclude(w + 1))