mirror of https://github.com/hsoft/collapseos.git
58 lines
1.6 KiB
C
58 lines
1.6 KiB
C
#include <stdio.h>
|
|
|
|
/* read stdin and strip Forth-style comments before spitting in stdout. This
|
|
also deduplicate spaces and newlines.
|
|
|
|
THIS PARSING IS IMPERFECT. Only a Forth interpreter can reliably detect
|
|
comments. For example, a naive parser misinterprets the "(" word definition as
|
|
a comment.
|
|
|
|
We work around this by considering as a comment opener only "(" chars preceeded
|
|
by more than once space or by a newline. Hackish, but works.
|
|
*/
|
|
|
|
int main()
|
|
{
|
|
int spccnt = 2; // if the first char is a (, consider it a comment opener.
|
|
int incomment = 0;
|
|
int c;
|
|
c = getchar();
|
|
while ( c != EOF ) {
|
|
if (c == '\n') {
|
|
if (!incomment) {
|
|
// We still spit newlines whenever we see them, Forth interpreter
|
|
// doesn't like when they're not there...
|
|
putchar(c);
|
|
}
|
|
spccnt += 2;
|
|
} else if (c == ' ') {
|
|
spccnt++;
|
|
} else {
|
|
if (incomment) {
|
|
if ((c == ')') && spccnt) {
|
|
incomment = 0;
|
|
}
|
|
} else {
|
|
if ((c == '(') && (spccnt > 1)) {
|
|
putchar(' ');
|
|
spccnt = 0;
|
|
int next = getchar();
|
|
if (next <= ' ') {
|
|
incomment = 1;
|
|
continue;
|
|
}
|
|
putchar(c);
|
|
c = next;
|
|
}
|
|
if (spccnt) {
|
|
putchar(' ');
|
|
}
|
|
putchar(c);
|
|
}
|
|
spccnt = 0;
|
|
}
|
|
c = getchar();
|
|
}
|
|
return 0;
|
|
}
|