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/*
make_pcre - PCRE plugin for GNU make.
Copyright (C) 2014 Dmitry Mikhirev
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <string.h>
#include <gnumake.h>
#include <pcre.h>
int plugin_is_GPL_compatible;
const int MAX_CAP = 256; /* maximum number of substrings to capture */
const int MAX_CAP_LEN = 3; /* number of decimal digits in MAX_CAP */
/* set_comp_opt - set regexp option */
int parse_comp_opt(const char flag, const char *func)
{
int b; /* PCRE configuration option value */
switch (flag) {
case 'i': /* ignore case */
return PCRE_CASELESS; break;
case 'm': /* multi-line */
return PCRE_MULTILINE; break;
case 's': /* single-line */
return PCRE_DOTALL; break;
case 'u': /* use Unicode properties */
pcre_config(PCRE_CONFIG_UNICODE_PROPERTIES, &b);
if (b) {
return PCRE_UCP;
} else {
fprintf(stderr, "%s: PCRE library does not support "
"Unicode properties, "
"`%c' option is unavailable\n",
func, flag);
}
break;
case 'U': /* ungreedy quantifiers */
return PCRE_UNGREEDY; break;
case 'x': /* extended regexp */
return PCRE_EXTENDED; break;
case 'X': /* PCRE extras */
return PCRE_EXTRA; break;
case '8': /* UTF-8 */
pcre_config(PCRE_CONFIG_UTF8, &b);
if (b) {
return PCRE_UTF8;
} else {
fprintf(stderr, "%s: PCRE library does not support "
"UTF-8, "
"`%c' option is unavailable\n",
func, flag);
}
break;
default: /* unknown option */
fprintf(stderr, "%s: unknown option `%c'\n", func, flag);
break;
}
return 0;
}
/* set_vars() - set make variables to captured substrings */
int set_vars(const char *subj, int *ovec, const int ncap)
{
int i; /* loop iterator */
const char *cap; /* captured substring */
int caplen; /* length of captured substring */
for (i = 0; (i < ncap) && (i < MAX_CAP); i++) {
caplen = pcre_get_substring(subj, ovec, ncap, i, &cap);
if (caplen < 0) { /* unable to get substring */
continue;
}
char mk_set[MAX_CAP_LEN + caplen + 16];
sprintf(mk_set, "define %d\n%s\nendef\n", i, cap);
gmk_eval(mk_set, NULL);
pcre_free_substring(cap);
}
for (; i < MAX_CAP; i++) { /* udefine remaining make vars */
char mk_set[MAX_CAP_LEN + 11];
sprintf(mk_set, "undefine %d\n", i);
gmk_eval(mk_set, NULL);
}
return ncap;
}
/* set_named_vars() - set make variables to substrings captured by name */
int set_named_vars(const pcre *re, const char *subj, int *ovec, const int ncap)
{
int ncount; /* name count */
int nentrysize; /* size of name entry */
char *ntable; /* name table */
int i; /* loop iterator */
char *n; /* name pointer */
const char *cap; /* captured substring */
int caplen; /* length of captured substring */
pcre_fullinfo(re, NULL, PCRE_INFO_NAMECOUNT, &ncount);
if (ncount <= 0) { /* no names defined, nothing to do */
return ncount;
}
pcre_fullinfo(re, NULL, PCRE_INFO_NAMEENTRYSIZE, &nentrysize);
pcre_fullinfo(re, NULL, PCRE_INFO_NAMETABLE, &ntable);
for (i = 0; i < ncount; i++) {
n = ntable + (i * nentrysize) + 2;
caplen = pcre_get_named_substring(re, subj, ovec,
ncap, n, &cap);
if (caplen < 0) { /* unable to get substring */
continue;
}
char mk_set[strlen(n) + caplen + 16];
sprintf(mk_set, "define %s\n%s\nendef\n", n, cap);
gmk_eval(mk_set, NULL);
pcre_free_substring(cap);
}
return i;
}
/* match() - function to be attached to make pattern matching function */
char *match(const char *name, int argc, char **argv)
{
char *pat = NULL; /* expanded pattern */
char *p; /* iteration pointer */
int co = 0; /* pattern compilation options */
pcre *re; /* compiled regexp */
const char *err; /* compilation error */
int erroffset; /* offset in pattern where error occured */
char *str = NULL; /* expanded subject string */
int ncap = 0; /* number of captured substrings */
int ovec[MAX_CAP*3]; /* ovector */
char *retstr = NULL; /* string to be returned */
if (argc > 2) { /* options provided, parse them */
for (p = argv[2]; *p != '\0'; p++) {
switch (*p) {
case 'E': /* expand pattern */
pat = gmk_expand(argv[0]);
break;
default: /* not match-specific option */
co |= parse_comp_opt(*p, name);
break;
}
}
}
if (pat == NULL) { /* compile unexpanded pattern */
re = pcre_compile(argv[0], co, &err, &erroffset, NULL);
} else { /* compile expanded pattern */
re = pcre_compile(pat, co, &err, &erroffset, NULL);
gmk_free(pat);
}
if (re == NULL) { /* compilation error */
fprintf(stderr, "%s: %d: %s\n", name, erroffset, err);
goto end_match;
}
/* expand subject string and execute regexp */
str = gmk_expand(argv[1]);
ncap = pcre_exec(re, NULL, str, strlen(str), 0, 0, ovec, MAX_CAP*3);
if ((ncap < 0) && (ncap != PCRE_ERROR_NOMATCH)) { /* error occured */
fprintf(stderr, "%s: pattern matching error: %d\n",
name, ncap);
}
if (ncap > 0) {
/* set retstr to matched substring */
int len = ovec[1] - ovec[0];
retstr = gmk_alloc(len + 1);
strncpy(retstr, str + ovec[0], len);
retstr[len] = '\0';
/* set named make vars to captured substrings */
set_named_vars(re, str, ovec, ncap);
}
pcre_free(re);
end_match:
/* set make vars to captured substrings */
set_vars(str, ovec, ncap);
if (str != NULL) {
gmk_free(str);
}
return retstr;
}
int pcre_gmk_setup()
{
/* add function for pattern matching */
gmk_add_function("pcre_find", (gmk_func_ptr)match, 2, 3,
GMK_FUNC_NOEXPAND);
gmk_add_function("m", (gmk_func_ptr)match, 2, 3, GMK_FUNC_NOEXPAND);
return 1;
}
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