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git://sourceware.org/git/lvm2.git
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d1b28647ed
and builds a *very* efficient engine that will tell you which regex a string matches with only a single pass through the string. To be used in the config file when specifying devices. o Anchor's aren't supported yet (^ and $) but that won't take long. o Also when we get some realistic config files we may want to consider adding an extra level of indirection to the dfa state in order to compress the table. It all depends on how large typical tables get.
94 lines
1.4 KiB
C
94 lines
1.4 KiB
C
/*
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* Copyright (C) 2001 Sistina Software (UK) Limited.
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*
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* This file is released under the GPL.
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*/
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#include "dbg_malloc.h"
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#include "log.h"
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#include "../../lib/regex/parse_rx.h"
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#include "bitset.h"
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#include <stdio.h>
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#include <ctype.h>
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static void _pretty_print(struct rx_node *rx, int depth)
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{
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int i;
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for (i = 0; i < depth; i++)
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printf(" ");
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/* display info about the node */
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switch (rx->type) {
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case CAT:
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printf("Cat");
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break;
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case OR:
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printf("Or");
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break;
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case STAR:
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printf("Star");
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break;
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case PLUS:
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printf("Plus");
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break;
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case QUEST:
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printf("Quest");
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break;
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case CHARSET:
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printf("Charset : ");
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for (i = 0; i < 256; i++) {
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if (bit(rx->charset, i) && isprint(i))
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printf("%c", (char) i);
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}
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break;
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default:
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printf("Unknown type");
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}
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printf("\n");
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if (rx->left)
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_pretty_print(rx->left, depth + 1);
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if (rx->right)
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_pretty_print(rx->right, depth + 1);
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}
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int main(int argc, char **argv)
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{
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struct pool *mem;
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struct rx_node *rx;
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if (argc != 2) {
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fprintf(stderr, "Usage : %s <regex>\n", argv[0]);
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exit(0);
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}
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init_log(stderr);
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init_debug(_LOG_INFO);
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if (!(mem = pool_create(1024))) {
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fprintf(stderr, "Couldn't create pool\n");
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exit(1);
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}
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if (!(rx = rx_parse_str(mem, argv[1]))) {
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fprintf(stderr, "Couldn't parse regex\n");
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exit(1);
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}
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_pretty_print(rx, 0);
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pool_destroy(mem);
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dump_memory();
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fin_log();
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return 0;
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}
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