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