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add -r to print out closer to original regex format

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This commit is contained in:
Alasdair Kergon 2010-04-22 03:12:01 +00:00
parent 3c76d9abaf
commit 705cf58916
1 changed files with 90 additions and 3 deletions
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91
old-tests/regex/parse_t.c
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@ -67,13 +67,96 @@ static void _pretty_print(struct rx_node *rx, int depth)
_pretty_print(rx->right, depth + 1);
}
static void _regex_print(struct rx_node *rx, int depth)
{
int i, numchars;
int left_and_right = (rx->left && rx->right);
if (left_and_right && rx->type == CAT && rx->left->type == OR)
printf("(");
if (rx->left)
_regex_print(rx->left, depth + 1);
if (left_and_right && rx->type == CAT && rx->left->type == OR)
printf(")");
/* display info about the node */
switch (rx->type) {
case CAT:
//printf("Cat");
break;
case OR:
printf("|");
break;
case STAR:
printf("*");
break;
case PLUS:
printf("+");
break;
case QUEST:
printf("?");
break;
case CHARSET:
numchars = 0;
for (i = 0; i < 256; i++)
if (dm_bit(rx->charset, i) && (isprint(i) || i == HAT_CHAR || i == DOLLAR_CHAR))
numchars++;
if (numchars == 97) {
printf(".");
break;
}
if (numchars > 1)
printf("[");
for (i = 0; i < 256; i++)
if (dm_bit(rx->charset, i)) {
if isprint(i)
printf("%c", (char) i);
else if (i == HAT_CHAR)
printf("^");
else if (i == DOLLAR_CHAR)
printf("$");
}
if (numchars > 1)
printf("]");
break;
default:
fprintf(stderr, "Unknown type");
}
if (left_and_right && rx->type == CAT && rx->right->type == OR)
printf("(");
if (rx->right)
_regex_print(rx->right, depth + 1);
if (left_and_right && rx->type == CAT && rx->right->type == OR)
printf(")");
if (!depth)
printf("\n");
}
int main(int argc, char **argv)
{
struct dm_pool *mem;
struct rx_node *rx;
int regex_print = 0;
int regex_arg = 1;
if (argc == 3 && !strcmp(argv[1], "-r")) {
regex_print++;
regex_arg++;
argc--;
}
if (argc != 2) {
fprintf(stderr, "Usage : %s <regex>\n", argv[0]);
fprintf(stderr, "Usage : %s [-r] <regex>\n", argv[0]);
exit(0);
}
@ -84,13 +167,17 @@ int main(int argc, char **argv)
exit(1);
}
if (!(rx = rx_parse_str(mem, argv[1]))) {
if (!(rx = rx_parse_str(mem, argv[regex_arg]))) {
dm_pool_destroy(mem);
fprintf(stderr, "Couldn't parse regex\n");
exit(1);
}
if (regex_print)
_regex_print(rx, 0);
else
_pretty_print(rx, 0);
dm_pool_destroy(mem);
return 0;