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builtin-grep: support -w (--word-regexp).

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Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Junio C Hamano 2006-05-02 15:40:49 -07:00
parent 2c866cf1c2
commit 7839a25eab
1 changed files with 30 additions and 0 deletions
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30
builtin-grep.c
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@ -89,6 +89,7 @@ struct grep_opt {
unsigned invert:1;
unsigned name_only:1;
unsigned count:1;
unsigned word_regexp:1;
int regflags;
unsigned pre_context;
unsigned post_context;
@ -128,6 +129,11 @@ static char *end_of_line(char *cp, unsigned long *left)
return cp;
}
static int word_char(char ch)
{
return isalnum(ch) || ch == '_';
}
static void show_line(struct grep_opt *opt, const char *bol, const char *eol,
const char *name, unsigned lno, char sign)
{
@ -171,6 +177,25 @@ static int grep_buffer(struct grep_opt *opt, const char *name,
regex_t *exp = &p->regexp;
hit = !regexec(exp, bol, ARRAY_SIZE(pmatch),
pmatch, 0);
if (hit && opt->word_regexp) {
/* Match beginning must be either
* beginning of the line, or at word
* boundary (i.e. the last char must
* not be alnum or underscore).
*/
if ((pmatch[0].rm_so < 0) ||
(eol - bol) <= pmatch[0].rm_so ||
(pmatch[0].rm_eo < 0) ||
(eol - bol) < pmatch[0].rm_eo)
die("regexp returned nonsense");
if (pmatch[0].rm_so != 0 &&
word_char(bol[pmatch[0].rm_so-1]))
continue; /* not a word boundary */
if ((eol-bol) < pmatch[0].rm_eo &&
word_char(bol[pmatch[0].rm_eo]))
continue; /* not a word boundary */
}
if (hit)
break;
}
@ -461,6 +486,11 @@ int cmd_grep(int argc, const char **argv, char **envp)
opt.count = 1;
continue;
}
if (!strcmp("-w", arg) ||
!strcmp("--word-regexp", arg)) {
opt.word_regexp = 1;
continue;
}
if (!strncmp("-A", arg, 2) ||
!strncmp("-B", arg, 2) ||
!strncmp("-C", arg, 2) ||