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![Jeff King](/assets/img/avatar_default.png)
The main interface to the low-level grep code is grep_buffer, which takes a pointer to a buffer and a size. This is convenient and flexible (we use it to grep commit bodies, files on disk, and blobs by sha1), but it makes it hard to pass extra information about what we are grepping (either for correctness, like overriding binary auto-detection, or for optimizations, like lazily loading blob contents). Instead, let's encapsulate the idea of a "grep source", including the buffer, its size, and where the data is coming from. This is similar to the diff_filespec structure used by the diff code (unsurprising, since future patches will implement some of the same optimizations found there). The diffstat is slightly scarier than the actual patch content. Most of the modified lines are simply replacing access to raw variables with their counterparts that are now in a "struct grep_source". Most of the added lines were taken from builtin/grep.c, which partially abstracted the idea of grep sources (for file vs sha1 sources). Instead of dropping the now-redundant code, this patch leaves builtin/grep.c using the traditional grep_buffer interface (which now wraps the grep_source interface). That makes it easy to test that there is no change of behavior (yet). Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
1343 lines
30 KiB
C
1343 lines
30 KiB
C
#include "cache.h"
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#include "grep.h"
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#include "userdiff.h"
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#include "xdiff-interface.h"
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void append_header_grep_pattern(struct grep_opt *opt, enum grep_header_field field, const char *pat)
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{
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struct grep_pat *p = xcalloc(1, sizeof(*p));
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p->pattern = pat;
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p->patternlen = strlen(pat);
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p->origin = "header";
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p->no = 0;
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p->token = GREP_PATTERN_HEAD;
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p->field = field;
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*opt->header_tail = p;
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opt->header_tail = &p->next;
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p->next = NULL;
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}
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void append_grep_pattern(struct grep_opt *opt, const char *pat,
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const char *origin, int no, enum grep_pat_token t)
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{
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append_grep_pat(opt, pat, strlen(pat), origin, no, t);
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}
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void append_grep_pat(struct grep_opt *opt, const char *pat, size_t patlen,
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const char *origin, int no, enum grep_pat_token t)
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{
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struct grep_pat *p = xcalloc(1, sizeof(*p));
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p->pattern = pat;
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p->patternlen = patlen;
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p->origin = origin;
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p->no = no;
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p->token = t;
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*opt->pattern_tail = p;
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opt->pattern_tail = &p->next;
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p->next = NULL;
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}
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struct grep_opt *grep_opt_dup(const struct grep_opt *opt)
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{
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struct grep_pat *pat;
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struct grep_opt *ret = xmalloc(sizeof(struct grep_opt));
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*ret = *opt;
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ret->pattern_list = NULL;
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ret->pattern_tail = &ret->pattern_list;
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for(pat = opt->pattern_list; pat != NULL; pat = pat->next)
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{
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if(pat->token == GREP_PATTERN_HEAD)
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append_header_grep_pattern(ret, pat->field,
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pat->pattern);
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else
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append_grep_pat(ret, pat->pattern, pat->patternlen,
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pat->origin, pat->no, pat->token);
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}
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return ret;
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}
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static NORETURN void compile_regexp_failed(const struct grep_pat *p,
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const char *error)
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{
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char where[1024];
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if (p->no)
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sprintf(where, "In '%s' at %d, ", p->origin, p->no);
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else if (p->origin)
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sprintf(where, "%s, ", p->origin);
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else
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where[0] = 0;
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die("%s'%s': %s", where, p->pattern, error);
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}
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#ifdef USE_LIBPCRE
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static void compile_pcre_regexp(struct grep_pat *p, const struct grep_opt *opt)
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{
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const char *error;
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int erroffset;
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int options = 0;
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if (opt->ignore_case)
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options |= PCRE_CASELESS;
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p->pcre_regexp = pcre_compile(p->pattern, options, &error, &erroffset,
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NULL);
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if (!p->pcre_regexp)
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compile_regexp_failed(p, error);
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p->pcre_extra_info = pcre_study(p->pcre_regexp, 0, &error);
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if (!p->pcre_extra_info && error)
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die("%s", error);
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}
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static int pcrematch(struct grep_pat *p, const char *line, const char *eol,
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regmatch_t *match, int eflags)
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{
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int ovector[30], ret, flags = 0;
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if (eflags & REG_NOTBOL)
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flags |= PCRE_NOTBOL;
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ret = pcre_exec(p->pcre_regexp, p->pcre_extra_info, line, eol - line,
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0, flags, ovector, ARRAY_SIZE(ovector));
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if (ret < 0 && ret != PCRE_ERROR_NOMATCH)
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die("pcre_exec failed with error code %d", ret);
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if (ret > 0) {
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ret = 0;
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match->rm_so = ovector[0];
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match->rm_eo = ovector[1];
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}
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return ret;
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}
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static void free_pcre_regexp(struct grep_pat *p)
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{
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pcre_free(p->pcre_regexp);
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pcre_free(p->pcre_extra_info);
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}
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#else /* !USE_LIBPCRE */
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static void compile_pcre_regexp(struct grep_pat *p, const struct grep_opt *opt)
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{
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die("cannot use Perl-compatible regexes when not compiled with USE_LIBPCRE");
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}
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static int pcrematch(struct grep_pat *p, const char *line, const char *eol,
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regmatch_t *match, int eflags)
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{
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return 1;
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}
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static void free_pcre_regexp(struct grep_pat *p)
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{
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}
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#endif /* !USE_LIBPCRE */
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static int is_fixed(const char *s, size_t len)
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{
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size_t i;
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/* regcomp cannot accept patterns with NULs so we
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* consider any pattern containing a NUL fixed.
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*/
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if (memchr(s, 0, len))
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return 1;
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for (i = 0; i < len; i++) {
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if (is_regex_special(s[i]))
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return 0;
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}
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return 1;
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}
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static void compile_regexp(struct grep_pat *p, struct grep_opt *opt)
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{
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int err;
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p->word_regexp = opt->word_regexp;
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p->ignore_case = opt->ignore_case;
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if (opt->fixed || is_fixed(p->pattern, p->patternlen))
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p->fixed = 1;
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else
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p->fixed = 0;
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if (p->fixed) {
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if (opt->regflags & REG_ICASE || p->ignore_case) {
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static char trans[256];
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int i;
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for (i = 0; i < 256; i++)
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trans[i] = tolower(i);
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p->kws = kwsalloc(trans);
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} else {
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p->kws = kwsalloc(NULL);
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}
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kwsincr(p->kws, p->pattern, p->patternlen);
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kwsprep(p->kws);
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return;
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}
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if (opt->pcre) {
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compile_pcre_regexp(p, opt);
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return;
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}
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err = regcomp(&p->regexp, p->pattern, opt->regflags);
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if (err) {
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char errbuf[1024];
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regerror(err, &p->regexp, errbuf, 1024);
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regfree(&p->regexp);
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compile_regexp_failed(p, errbuf);
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}
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}
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static struct grep_expr *compile_pattern_or(struct grep_pat **);
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static struct grep_expr *compile_pattern_atom(struct grep_pat **list)
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{
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struct grep_pat *p;
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struct grep_expr *x;
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p = *list;
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if (!p)
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return NULL;
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switch (p->token) {
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case GREP_PATTERN: /* atom */
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case GREP_PATTERN_HEAD:
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case GREP_PATTERN_BODY:
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x = xcalloc(1, sizeof (struct grep_expr));
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x->node = GREP_NODE_ATOM;
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x->u.atom = p;
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*list = p->next;
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return x;
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case GREP_OPEN_PAREN:
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*list = p->next;
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x = compile_pattern_or(list);
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if (!*list || (*list)->token != GREP_CLOSE_PAREN)
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die("unmatched parenthesis");
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*list = (*list)->next;
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return x;
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default:
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return NULL;
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}
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}
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static struct grep_expr *compile_pattern_not(struct grep_pat **list)
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{
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struct grep_pat *p;
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struct grep_expr *x;
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p = *list;
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if (!p)
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return NULL;
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switch (p->token) {
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case GREP_NOT:
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if (!p->next)
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die("--not not followed by pattern expression");
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*list = p->next;
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x = xcalloc(1, sizeof (struct grep_expr));
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x->node = GREP_NODE_NOT;
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x->u.unary = compile_pattern_not(list);
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if (!x->u.unary)
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die("--not followed by non pattern expression");
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return x;
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default:
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return compile_pattern_atom(list);
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}
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}
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static struct grep_expr *compile_pattern_and(struct grep_pat **list)
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{
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struct grep_pat *p;
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struct grep_expr *x, *y, *z;
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x = compile_pattern_not(list);
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p = *list;
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if (p && p->token == GREP_AND) {
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if (!p->next)
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die("--and not followed by pattern expression");
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*list = p->next;
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y = compile_pattern_and(list);
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if (!y)
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die("--and not followed by pattern expression");
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z = xcalloc(1, sizeof (struct grep_expr));
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z->node = GREP_NODE_AND;
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z->u.binary.left = x;
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z->u.binary.right = y;
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return z;
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}
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return x;
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}
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static struct grep_expr *compile_pattern_or(struct grep_pat **list)
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{
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struct grep_pat *p;
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struct grep_expr *x, *y, *z;
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x = compile_pattern_and(list);
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p = *list;
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if (x && p && p->token != GREP_CLOSE_PAREN) {
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y = compile_pattern_or(list);
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if (!y)
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die("not a pattern expression %s", p->pattern);
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z = xcalloc(1, sizeof (struct grep_expr));
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z->node = GREP_NODE_OR;
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z->u.binary.left = x;
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z->u.binary.right = y;
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return z;
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}
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return x;
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}
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static struct grep_expr *compile_pattern_expr(struct grep_pat **list)
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{
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return compile_pattern_or(list);
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}
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static struct grep_expr *grep_true_expr(void)
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{
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struct grep_expr *z = xcalloc(1, sizeof(*z));
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z->node = GREP_NODE_TRUE;
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return z;
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}
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static struct grep_expr *grep_or_expr(struct grep_expr *left, struct grep_expr *right)
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{
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struct grep_expr *z = xcalloc(1, sizeof(*z));
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z->node = GREP_NODE_OR;
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z->u.binary.left = left;
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z->u.binary.right = right;
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return z;
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}
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static struct grep_expr *prep_header_patterns(struct grep_opt *opt)
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{
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struct grep_pat *p;
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struct grep_expr *header_expr;
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struct grep_expr *(header_group[GREP_HEADER_FIELD_MAX]);
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enum grep_header_field fld;
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if (!opt->header_list)
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return NULL;
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p = opt->header_list;
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for (p = opt->header_list; p; p = p->next) {
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if (p->token != GREP_PATTERN_HEAD)
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die("bug: a non-header pattern in grep header list.");
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if (p->field < 0 || GREP_HEADER_FIELD_MAX <= p->field)
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die("bug: unknown header field %d", p->field);
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compile_regexp(p, opt);
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}
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for (fld = 0; fld < GREP_HEADER_FIELD_MAX; fld++)
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header_group[fld] = NULL;
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for (p = opt->header_list; p; p = p->next) {
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struct grep_expr *h;
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struct grep_pat *pp = p;
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h = compile_pattern_atom(&pp);
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if (!h || pp != p->next)
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die("bug: malformed header expr");
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if (!header_group[p->field]) {
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header_group[p->field] = h;
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continue;
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}
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header_group[p->field] = grep_or_expr(h, header_group[p->field]);
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}
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header_expr = NULL;
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for (fld = 0; fld < GREP_HEADER_FIELD_MAX; fld++) {
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if (!header_group[fld])
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continue;
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if (!header_expr)
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header_expr = grep_true_expr();
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header_expr = grep_or_expr(header_group[fld], header_expr);
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}
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return header_expr;
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}
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void compile_grep_patterns(struct grep_opt *opt)
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{
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struct grep_pat *p;
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struct grep_expr *header_expr = prep_header_patterns(opt);
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for (p = opt->pattern_list; p; p = p->next) {
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switch (p->token) {
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case GREP_PATTERN: /* atom */
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case GREP_PATTERN_HEAD:
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case GREP_PATTERN_BODY:
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compile_regexp(p, opt);
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break;
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default:
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opt->extended = 1;
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break;
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}
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}
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if (opt->all_match || header_expr)
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opt->extended = 1;
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else if (!opt->extended)
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return;
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p = opt->pattern_list;
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if (p)
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opt->pattern_expression = compile_pattern_expr(&p);
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if (p)
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die("incomplete pattern expression: %s", p->pattern);
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if (!header_expr)
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return;
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if (!opt->pattern_expression)
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opt->pattern_expression = header_expr;
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else
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opt->pattern_expression = grep_or_expr(opt->pattern_expression,
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header_expr);
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opt->all_match = 1;
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}
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static void free_pattern_expr(struct grep_expr *x)
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{
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switch (x->node) {
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case GREP_NODE_TRUE:
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case GREP_NODE_ATOM:
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break;
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case GREP_NODE_NOT:
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free_pattern_expr(x->u.unary);
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break;
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case GREP_NODE_AND:
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case GREP_NODE_OR:
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free_pattern_expr(x->u.binary.left);
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free_pattern_expr(x->u.binary.right);
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break;
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}
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free(x);
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}
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void free_grep_patterns(struct grep_opt *opt)
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{
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struct grep_pat *p, *n;
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for (p = opt->pattern_list; p; p = n) {
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n = p->next;
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switch (p->token) {
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case GREP_PATTERN: /* atom */
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case GREP_PATTERN_HEAD:
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case GREP_PATTERN_BODY:
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if (p->kws)
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kwsfree(p->kws);
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else if (p->pcre_regexp)
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free_pcre_regexp(p);
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else
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regfree(&p->regexp);
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break;
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default:
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break;
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}
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free(p);
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}
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if (!opt->extended)
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return;
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free_pattern_expr(opt->pattern_expression);
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}
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static char *end_of_line(char *cp, unsigned long *left)
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{
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unsigned long l = *left;
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while (l && *cp != '\n') {
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l--;
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cp++;
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}
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*left = l;
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return cp;
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}
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static int word_char(char ch)
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{
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return isalnum(ch) || ch == '_';
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}
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static void output_color(struct grep_opt *opt, const void *data, size_t size,
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const char *color)
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{
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if (want_color(opt->color) && color && color[0]) {
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opt->output(opt, color, strlen(color));
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opt->output(opt, data, size);
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opt->output(opt, GIT_COLOR_RESET, strlen(GIT_COLOR_RESET));
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} else
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opt->output(opt, data, size);
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}
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static void output_sep(struct grep_opt *opt, char sign)
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{
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if (opt->null_following_name)
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opt->output(opt, "\0", 1);
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else
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output_color(opt, &sign, 1, opt->color_sep);
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}
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static void show_name(struct grep_opt *opt, const char *name)
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{
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output_color(opt, name, strlen(name), opt->color_filename);
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opt->output(opt, opt->null_following_name ? "\0" : "\n", 1);
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}
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static int fixmatch(struct grep_pat *p, char *line, char *eol,
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regmatch_t *match)
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{
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struct kwsmatch kwsm;
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size_t offset = kwsexec(p->kws, line, eol - line, &kwsm);
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if (offset == -1) {
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match->rm_so = match->rm_eo = -1;
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return REG_NOMATCH;
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} else {
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match->rm_so = offset;
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match->rm_eo = match->rm_so + kwsm.size[0];
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return 0;
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}
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}
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static int regmatch(const regex_t *preg, char *line, char *eol,
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regmatch_t *match, int eflags)
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{
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#ifdef REG_STARTEND
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match->rm_so = 0;
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match->rm_eo = eol - line;
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eflags |= REG_STARTEND;
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#endif
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return regexec(preg, line, 1, match, eflags);
|
|
}
|
|
|
|
static int patmatch(struct grep_pat *p, char *line, char *eol,
|
|
regmatch_t *match, int eflags)
|
|
{
|
|
int hit;
|
|
|
|
if (p->fixed)
|
|
hit = !fixmatch(p, line, eol, match);
|
|
else if (p->pcre_regexp)
|
|
hit = !pcrematch(p, line, eol, match, eflags);
|
|
else
|
|
hit = !regmatch(&p->regexp, line, eol, match, eflags);
|
|
|
|
return hit;
|
|
}
|
|
|
|
static int strip_timestamp(char *bol, char **eol_p)
|
|
{
|
|
char *eol = *eol_p;
|
|
int ch;
|
|
|
|
while (bol < --eol) {
|
|
if (*eol != '>')
|
|
continue;
|
|
*eol_p = ++eol;
|
|
ch = *eol;
|
|
*eol = '\0';
|
|
return ch;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct {
|
|
const char *field;
|
|
size_t len;
|
|
} header_field[] = {
|
|
{ "author ", 7 },
|
|
{ "committer ", 10 },
|
|
};
|
|
|
|
static int match_one_pattern(struct grep_pat *p, char *bol, char *eol,
|
|
enum grep_context ctx,
|
|
regmatch_t *pmatch, int eflags)
|
|
{
|
|
int hit = 0;
|
|
int saved_ch = 0;
|
|
const char *start = bol;
|
|
|
|
if ((p->token != GREP_PATTERN) &&
|
|
((p->token == GREP_PATTERN_HEAD) != (ctx == GREP_CONTEXT_HEAD)))
|
|
return 0;
|
|
|
|
if (p->token == GREP_PATTERN_HEAD) {
|
|
const char *field;
|
|
size_t len;
|
|
assert(p->field < ARRAY_SIZE(header_field));
|
|
field = header_field[p->field].field;
|
|
len = header_field[p->field].len;
|
|
if (strncmp(bol, field, len))
|
|
return 0;
|
|
bol += len;
|
|
saved_ch = strip_timestamp(bol, &eol);
|
|
}
|
|
|
|
again:
|
|
hit = patmatch(p, bol, eol, pmatch, eflags);
|
|
|
|
if (hit && p->word_regexp) {
|
|
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");
|
|
|
|
/* Match beginning must be either beginning of the
|
|
* line, or at word boundary (i.e. the last char must
|
|
* not be a word char). Similarly, match end must be
|
|
* either end of the line, or at word boundary
|
|
* (i.e. the next char must not be a word char).
|
|
*/
|
|
if ( ((pmatch[0].rm_so == 0) ||
|
|
!word_char(bol[pmatch[0].rm_so-1])) &&
|
|
((pmatch[0].rm_eo == (eol-bol)) ||
|
|
!word_char(bol[pmatch[0].rm_eo])) )
|
|
;
|
|
else
|
|
hit = 0;
|
|
|
|
/* Words consist of at least one character. */
|
|
if (pmatch->rm_so == pmatch->rm_eo)
|
|
hit = 0;
|
|
|
|
if (!hit && pmatch[0].rm_so + bol + 1 < eol) {
|
|
/* There could be more than one match on the
|
|
* line, and the first match might not be
|
|
* strict word match. But later ones could be!
|
|
* Forward to the next possible start, i.e. the
|
|
* next position following a non-word char.
|
|
*/
|
|
bol = pmatch[0].rm_so + bol + 1;
|
|
while (word_char(bol[-1]) && bol < eol)
|
|
bol++;
|
|
eflags |= REG_NOTBOL;
|
|
if (bol < eol)
|
|
goto again;
|
|
}
|
|
}
|
|
if (p->token == GREP_PATTERN_HEAD && saved_ch)
|
|
*eol = saved_ch;
|
|
if (hit) {
|
|
pmatch[0].rm_so += bol - start;
|
|
pmatch[0].rm_eo += bol - start;
|
|
}
|
|
return hit;
|
|
}
|
|
|
|
static int match_expr_eval(struct grep_expr *x, char *bol, char *eol,
|
|
enum grep_context ctx, int collect_hits)
|
|
{
|
|
int h = 0;
|
|
regmatch_t match;
|
|
|
|
if (!x)
|
|
die("Not a valid grep expression");
|
|
switch (x->node) {
|
|
case GREP_NODE_TRUE:
|
|
h = 1;
|
|
break;
|
|
case GREP_NODE_ATOM:
|
|
h = match_one_pattern(x->u.atom, bol, eol, ctx, &match, 0);
|
|
break;
|
|
case GREP_NODE_NOT:
|
|
h = !match_expr_eval(x->u.unary, bol, eol, ctx, 0);
|
|
break;
|
|
case GREP_NODE_AND:
|
|
if (!match_expr_eval(x->u.binary.left, bol, eol, ctx, 0))
|
|
return 0;
|
|
h = match_expr_eval(x->u.binary.right, bol, eol, ctx, 0);
|
|
break;
|
|
case GREP_NODE_OR:
|
|
if (!collect_hits)
|
|
return (match_expr_eval(x->u.binary.left,
|
|
bol, eol, ctx, 0) ||
|
|
match_expr_eval(x->u.binary.right,
|
|
bol, eol, ctx, 0));
|
|
h = match_expr_eval(x->u.binary.left, bol, eol, ctx, 0);
|
|
x->u.binary.left->hit |= h;
|
|
h |= match_expr_eval(x->u.binary.right, bol, eol, ctx, 1);
|
|
break;
|
|
default:
|
|
die("Unexpected node type (internal error) %d", x->node);
|
|
}
|
|
if (collect_hits)
|
|
x->hit |= h;
|
|
return h;
|
|
}
|
|
|
|
static int match_expr(struct grep_opt *opt, char *bol, char *eol,
|
|
enum grep_context ctx, int collect_hits)
|
|
{
|
|
struct grep_expr *x = opt->pattern_expression;
|
|
return match_expr_eval(x, bol, eol, ctx, collect_hits);
|
|
}
|
|
|
|
static int match_line(struct grep_opt *opt, char *bol, char *eol,
|
|
enum grep_context ctx, int collect_hits)
|
|
{
|
|
struct grep_pat *p;
|
|
regmatch_t match;
|
|
|
|
if (opt->extended)
|
|
return match_expr(opt, bol, eol, ctx, collect_hits);
|
|
|
|
/* we do not call with collect_hits without being extended */
|
|
for (p = opt->pattern_list; p; p = p->next) {
|
|
if (match_one_pattern(p, bol, eol, ctx, &match, 0))
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int match_next_pattern(struct grep_pat *p, char *bol, char *eol,
|
|
enum grep_context ctx,
|
|
regmatch_t *pmatch, int eflags)
|
|
{
|
|
regmatch_t match;
|
|
|
|
if (!match_one_pattern(p, bol, eol, ctx, &match, eflags))
|
|
return 0;
|
|
if (match.rm_so < 0 || match.rm_eo < 0)
|
|
return 0;
|
|
if (pmatch->rm_so >= 0 && pmatch->rm_eo >= 0) {
|
|
if (match.rm_so > pmatch->rm_so)
|
|
return 1;
|
|
if (match.rm_so == pmatch->rm_so && match.rm_eo < pmatch->rm_eo)
|
|
return 1;
|
|
}
|
|
pmatch->rm_so = match.rm_so;
|
|
pmatch->rm_eo = match.rm_eo;
|
|
return 1;
|
|
}
|
|
|
|
static int next_match(struct grep_opt *opt, char *bol, char *eol,
|
|
enum grep_context ctx, regmatch_t *pmatch, int eflags)
|
|
{
|
|
struct grep_pat *p;
|
|
int hit = 0;
|
|
|
|
pmatch->rm_so = pmatch->rm_eo = -1;
|
|
if (bol < eol) {
|
|
for (p = opt->pattern_list; p; p = p->next) {
|
|
switch (p->token) {
|
|
case GREP_PATTERN: /* atom */
|
|
case GREP_PATTERN_HEAD:
|
|
case GREP_PATTERN_BODY:
|
|
hit |= match_next_pattern(p, bol, eol, ctx,
|
|
pmatch, eflags);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return hit;
|
|
}
|
|
|
|
static void show_line(struct grep_opt *opt, char *bol, char *eol,
|
|
const char *name, unsigned lno, char sign)
|
|
{
|
|
int rest = eol - bol;
|
|
char *line_color = NULL;
|
|
|
|
if (opt->file_break && opt->last_shown == 0) {
|
|
if (opt->show_hunk_mark)
|
|
opt->output(opt, "\n", 1);
|
|
} else if (opt->pre_context || opt->post_context || opt->funcbody) {
|
|
if (opt->last_shown == 0) {
|
|
if (opt->show_hunk_mark) {
|
|
output_color(opt, "--", 2, opt->color_sep);
|
|
opt->output(opt, "\n", 1);
|
|
}
|
|
} else if (lno > opt->last_shown + 1) {
|
|
output_color(opt, "--", 2, opt->color_sep);
|
|
opt->output(opt, "\n", 1);
|
|
}
|
|
}
|
|
if (opt->heading && opt->last_shown == 0) {
|
|
output_color(opt, name, strlen(name), opt->color_filename);
|
|
opt->output(opt, "\n", 1);
|
|
}
|
|
opt->last_shown = lno;
|
|
|
|
if (!opt->heading && opt->pathname) {
|
|
output_color(opt, name, strlen(name), opt->color_filename);
|
|
output_sep(opt, sign);
|
|
}
|
|
if (opt->linenum) {
|
|
char buf[32];
|
|
snprintf(buf, sizeof(buf), "%d", lno);
|
|
output_color(opt, buf, strlen(buf), opt->color_lineno);
|
|
output_sep(opt, sign);
|
|
}
|
|
if (opt->color) {
|
|
regmatch_t match;
|
|
enum grep_context ctx = GREP_CONTEXT_BODY;
|
|
int ch = *eol;
|
|
int eflags = 0;
|
|
|
|
if (sign == ':')
|
|
line_color = opt->color_selected;
|
|
else if (sign == '-')
|
|
line_color = opt->color_context;
|
|
else if (sign == '=')
|
|
line_color = opt->color_function;
|
|
*eol = '\0';
|
|
while (next_match(opt, bol, eol, ctx, &match, eflags)) {
|
|
if (match.rm_so == match.rm_eo)
|
|
break;
|
|
|
|
output_color(opt, bol, match.rm_so, line_color);
|
|
output_color(opt, bol + match.rm_so,
|
|
match.rm_eo - match.rm_so,
|
|
opt->color_match);
|
|
bol += match.rm_eo;
|
|
rest -= match.rm_eo;
|
|
eflags = REG_NOTBOL;
|
|
}
|
|
*eol = ch;
|
|
}
|
|
output_color(opt, bol, rest, line_color);
|
|
opt->output(opt, "\n", 1);
|
|
}
|
|
|
|
#ifndef NO_PTHREADS
|
|
int grep_use_locks;
|
|
|
|
/*
|
|
* This lock protects access to the gitattributes machinery, which is
|
|
* not thread-safe.
|
|
*/
|
|
pthread_mutex_t grep_attr_mutex;
|
|
|
|
static inline void grep_attr_lock(void)
|
|
{
|
|
if (grep_use_locks)
|
|
pthread_mutex_lock(&grep_attr_mutex);
|
|
}
|
|
|
|
static inline void grep_attr_unlock(void)
|
|
{
|
|
if (grep_use_locks)
|
|
pthread_mutex_unlock(&grep_attr_mutex);
|
|
}
|
|
|
|
/*
|
|
* Same as git_attr_mutex, but protecting the thread-unsafe object db access.
|
|
*/
|
|
pthread_mutex_t grep_read_mutex;
|
|
|
|
#else
|
|
#define grep_attr_lock()
|
|
#define grep_attr_unlock()
|
|
#endif
|
|
|
|
static int match_funcname(struct grep_opt *opt, struct grep_source *gs, char *bol, char *eol)
|
|
{
|
|
xdemitconf_t *xecfg = opt->priv;
|
|
if (xecfg && !xecfg->find_func) {
|
|
struct userdiff_driver *drv;
|
|
grep_attr_lock();
|
|
drv = userdiff_find_by_path(gs->name);
|
|
grep_attr_unlock();
|
|
if (drv && drv->funcname.pattern) {
|
|
const struct userdiff_funcname *pe = &drv->funcname;
|
|
xdiff_set_find_func(xecfg, pe->pattern, pe->cflags);
|
|
} else {
|
|
xecfg = opt->priv = NULL;
|
|
}
|
|
}
|
|
|
|
if (xecfg) {
|
|
char buf[1];
|
|
return xecfg->find_func(bol, eol - bol, buf, 1,
|
|
xecfg->find_func_priv) >= 0;
|
|
}
|
|
|
|
if (bol == eol)
|
|
return 0;
|
|
if (isalpha(*bol) || *bol == '_' || *bol == '$')
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static void show_funcname_line(struct grep_opt *opt, struct grep_source *gs,
|
|
char *bol, unsigned lno)
|
|
{
|
|
while (bol > gs->buf) {
|
|
char *eol = --bol;
|
|
|
|
while (bol > gs->buf && bol[-1] != '\n')
|
|
bol--;
|
|
lno--;
|
|
|
|
if (lno <= opt->last_shown)
|
|
break;
|
|
|
|
if (match_funcname(opt, gs, bol, eol)) {
|
|
show_line(opt, bol, eol, gs->name, lno, '=');
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void show_pre_context(struct grep_opt *opt, struct grep_source *gs,
|
|
char *bol, char *end, unsigned lno)
|
|
{
|
|
unsigned cur = lno, from = 1, funcname_lno = 0;
|
|
int funcname_needed = !!opt->funcname;
|
|
|
|
if (opt->funcbody && !match_funcname(opt, gs, bol, end))
|
|
funcname_needed = 2;
|
|
|
|
if (opt->pre_context < lno)
|
|
from = lno - opt->pre_context;
|
|
if (from <= opt->last_shown)
|
|
from = opt->last_shown + 1;
|
|
|
|
/* Rewind. */
|
|
while (bol > gs->buf &&
|
|
cur > (funcname_needed == 2 ? opt->last_shown + 1 : from)) {
|
|
char *eol = --bol;
|
|
|
|
while (bol > gs->buf && bol[-1] != '\n')
|
|
bol--;
|
|
cur--;
|
|
if (funcname_needed && match_funcname(opt, gs, bol, eol)) {
|
|
funcname_lno = cur;
|
|
funcname_needed = 0;
|
|
}
|
|
}
|
|
|
|
/* We need to look even further back to find a function signature. */
|
|
if (opt->funcname && funcname_needed)
|
|
show_funcname_line(opt, gs, bol, cur);
|
|
|
|
/* Back forward. */
|
|
while (cur < lno) {
|
|
char *eol = bol, sign = (cur == funcname_lno) ? '=' : '-';
|
|
|
|
while (*eol != '\n')
|
|
eol++;
|
|
show_line(opt, bol, eol, gs->name, cur, sign);
|
|
bol = eol + 1;
|
|
cur++;
|
|
}
|
|
}
|
|
|
|
static int should_lookahead(struct grep_opt *opt)
|
|
{
|
|
struct grep_pat *p;
|
|
|
|
if (opt->extended)
|
|
return 0; /* punt for too complex stuff */
|
|
if (opt->invert)
|
|
return 0;
|
|
for (p = opt->pattern_list; p; p = p->next) {
|
|
if (p->token != GREP_PATTERN)
|
|
return 0; /* punt for "header only" and stuff */
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static int look_ahead(struct grep_opt *opt,
|
|
unsigned long *left_p,
|
|
unsigned *lno_p,
|
|
char **bol_p)
|
|
{
|
|
unsigned lno = *lno_p;
|
|
char *bol = *bol_p;
|
|
struct grep_pat *p;
|
|
char *sp, *last_bol;
|
|
regoff_t earliest = -1;
|
|
|
|
for (p = opt->pattern_list; p; p = p->next) {
|
|
int hit;
|
|
regmatch_t m;
|
|
|
|
hit = patmatch(p, bol, bol + *left_p, &m, 0);
|
|
if (!hit || m.rm_so < 0 || m.rm_eo < 0)
|
|
continue;
|
|
if (earliest < 0 || m.rm_so < earliest)
|
|
earliest = m.rm_so;
|
|
}
|
|
|
|
if (earliest < 0) {
|
|
*bol_p = bol + *left_p;
|
|
*left_p = 0;
|
|
return 1;
|
|
}
|
|
for (sp = bol + earliest; bol < sp && sp[-1] != '\n'; sp--)
|
|
; /* find the beginning of the line */
|
|
last_bol = sp;
|
|
|
|
for (sp = bol; sp < last_bol; sp++) {
|
|
if (*sp == '\n')
|
|
lno++;
|
|
}
|
|
*left_p -= last_bol - bol;
|
|
*bol_p = last_bol;
|
|
*lno_p = lno;
|
|
return 0;
|
|
}
|
|
|
|
static void std_output(struct grep_opt *opt, const void *buf, size_t size)
|
|
{
|
|
fwrite(buf, size, 1, stdout);
|
|
}
|
|
|
|
static int grep_source_1(struct grep_opt *opt, struct grep_source *gs, int collect_hits)
|
|
{
|
|
char *bol;
|
|
unsigned long left;
|
|
unsigned lno = 1;
|
|
unsigned last_hit = 0;
|
|
int binary_match_only = 0;
|
|
unsigned count = 0;
|
|
int try_lookahead = 0;
|
|
int show_function = 0;
|
|
enum grep_context ctx = GREP_CONTEXT_HEAD;
|
|
xdemitconf_t xecfg;
|
|
|
|
if (!opt->output)
|
|
opt->output = std_output;
|
|
|
|
if (opt->pre_context || opt->post_context || opt->file_break ||
|
|
opt->funcbody) {
|
|
/* Show hunk marks, except for the first file. */
|
|
if (opt->last_shown)
|
|
opt->show_hunk_mark = 1;
|
|
/*
|
|
* If we're using threads then we can't easily identify
|
|
* the first file. Always put hunk marks in that case
|
|
* and skip the very first one later in work_done().
|
|
*/
|
|
if (opt->output != std_output)
|
|
opt->show_hunk_mark = 1;
|
|
}
|
|
opt->last_shown = 0;
|
|
|
|
if (grep_source_load(gs) < 0)
|
|
return 0;
|
|
|
|
switch (opt->binary) {
|
|
case GREP_BINARY_DEFAULT:
|
|
if (buffer_is_binary(gs->buf, gs->size))
|
|
binary_match_only = 1;
|
|
break;
|
|
case GREP_BINARY_NOMATCH:
|
|
if (buffer_is_binary(gs->buf, gs->size))
|
|
return 0; /* Assume unmatch */
|
|
break;
|
|
case GREP_BINARY_TEXT:
|
|
break;
|
|
default:
|
|
die("bug: unknown binary handling mode");
|
|
}
|
|
|
|
memset(&xecfg, 0, sizeof(xecfg));
|
|
opt->priv = &xecfg;
|
|
|
|
try_lookahead = should_lookahead(opt);
|
|
|
|
bol = gs->buf;
|
|
left = gs->size;
|
|
while (left) {
|
|
char *eol, ch;
|
|
int hit;
|
|
|
|
/*
|
|
* look_ahead() skips quickly to the line that possibly
|
|
* has the next hit; don't call it if we need to do
|
|
* something more than just skipping the current line
|
|
* in response to an unmatch for the current line. E.g.
|
|
* inside a post-context window, we will show the current
|
|
* line as a context around the previous hit when it
|
|
* doesn't hit.
|
|
*/
|
|
if (try_lookahead
|
|
&& !(last_hit
|
|
&& (show_function ||
|
|
lno <= last_hit + opt->post_context))
|
|
&& look_ahead(opt, &left, &lno, &bol))
|
|
break;
|
|
eol = end_of_line(bol, &left);
|
|
ch = *eol;
|
|
*eol = 0;
|
|
|
|
if ((ctx == GREP_CONTEXT_HEAD) && (eol == bol))
|
|
ctx = GREP_CONTEXT_BODY;
|
|
|
|
hit = match_line(opt, bol, eol, ctx, collect_hits);
|
|
*eol = ch;
|
|
|
|
if (collect_hits)
|
|
goto next_line;
|
|
|
|
/* "grep -v -e foo -e bla" should list lines
|
|
* that do not have either, so inversion should
|
|
* be done outside.
|
|
*/
|
|
if (opt->invert)
|
|
hit = !hit;
|
|
if (opt->unmatch_name_only) {
|
|
if (hit)
|
|
return 0;
|
|
goto next_line;
|
|
}
|
|
if (hit) {
|
|
count++;
|
|
if (opt->status_only)
|
|
return 1;
|
|
if (opt->name_only) {
|
|
show_name(opt, gs->name);
|
|
return 1;
|
|
}
|
|
if (opt->count)
|
|
goto next_line;
|
|
if (binary_match_only) {
|
|
opt->output(opt, "Binary file ", 12);
|
|
output_color(opt, gs->name, strlen(gs->name),
|
|
opt->color_filename);
|
|
opt->output(opt, " matches\n", 9);
|
|
return 1;
|
|
}
|
|
/* Hit at this line. If we haven't shown the
|
|
* pre-context lines, we would need to show them.
|
|
*/
|
|
if (opt->pre_context || opt->funcbody)
|
|
show_pre_context(opt, gs, bol, eol, lno);
|
|
else if (opt->funcname)
|
|
show_funcname_line(opt, gs, bol, lno);
|
|
show_line(opt, bol, eol, gs->name, lno, ':');
|
|
last_hit = lno;
|
|
if (opt->funcbody)
|
|
show_function = 1;
|
|
goto next_line;
|
|
}
|
|
if (show_function && match_funcname(opt, gs, bol, eol))
|
|
show_function = 0;
|
|
if (show_function ||
|
|
(last_hit && lno <= last_hit + opt->post_context)) {
|
|
/* If the last hit is within the post context,
|
|
* we need to show this line.
|
|
*/
|
|
show_line(opt, bol, eol, gs->name, lno, '-');
|
|
}
|
|
|
|
next_line:
|
|
bol = eol + 1;
|
|
if (!left)
|
|
break;
|
|
left--;
|
|
lno++;
|
|
}
|
|
|
|
if (collect_hits)
|
|
return 0;
|
|
|
|
if (opt->status_only)
|
|
return 0;
|
|
if (opt->unmatch_name_only) {
|
|
/* We did not see any hit, so we want to show this */
|
|
show_name(opt, gs->name);
|
|
return 1;
|
|
}
|
|
|
|
xdiff_clear_find_func(&xecfg);
|
|
opt->priv = NULL;
|
|
|
|
/* NEEDSWORK:
|
|
* The real "grep -c foo *.c" gives many "bar.c:0" lines,
|
|
* which feels mostly useless but sometimes useful. Maybe
|
|
* make it another option? For now suppress them.
|
|
*/
|
|
if (opt->count && count) {
|
|
char buf[32];
|
|
output_color(opt, gs->name, strlen(gs->name), opt->color_filename);
|
|
output_sep(opt, ':');
|
|
snprintf(buf, sizeof(buf), "%u\n", count);
|
|
opt->output(opt, buf, strlen(buf));
|
|
return 1;
|
|
}
|
|
return !!last_hit;
|
|
}
|
|
|
|
static void clr_hit_marker(struct grep_expr *x)
|
|
{
|
|
/* All-hit markers are meaningful only at the very top level
|
|
* OR node.
|
|
*/
|
|
while (1) {
|
|
x->hit = 0;
|
|
if (x->node != GREP_NODE_OR)
|
|
return;
|
|
x->u.binary.left->hit = 0;
|
|
x = x->u.binary.right;
|
|
}
|
|
}
|
|
|
|
static int chk_hit_marker(struct grep_expr *x)
|
|
{
|
|
/* Top level nodes have hit markers. See if they all are hits */
|
|
while (1) {
|
|
if (x->node != GREP_NODE_OR)
|
|
return x->hit;
|
|
if (!x->u.binary.left->hit)
|
|
return 0;
|
|
x = x->u.binary.right;
|
|
}
|
|
}
|
|
|
|
int grep_source(struct grep_opt *opt, struct grep_source *gs)
|
|
{
|
|
/*
|
|
* we do not have to do the two-pass grep when we do not check
|
|
* buffer-wide "all-match".
|
|
*/
|
|
if (!opt->all_match)
|
|
return grep_source_1(opt, gs, 0);
|
|
|
|
/* Otherwise the toplevel "or" terms hit a bit differently.
|
|
* We first clear hit markers from them.
|
|
*/
|
|
clr_hit_marker(opt->pattern_expression);
|
|
grep_source_1(opt, gs, 1);
|
|
|
|
if (!chk_hit_marker(opt->pattern_expression))
|
|
return 0;
|
|
|
|
return grep_source_1(opt, gs, 0);
|
|
}
|
|
|
|
int grep_buffer(struct grep_opt *opt, const char *name, char *buf, unsigned long size)
|
|
{
|
|
struct grep_source gs;
|
|
int r;
|
|
|
|
grep_source_init(&gs, GREP_SOURCE_BUF, name, NULL);
|
|
gs.buf = buf;
|
|
gs.size = size;
|
|
|
|
r = grep_source(opt, &gs);
|
|
|
|
grep_source_clear(&gs);
|
|
return r;
|
|
}
|
|
|
|
void grep_source_init(struct grep_source *gs, enum grep_source_type type,
|
|
const char *name, const void *identifier)
|
|
{
|
|
gs->type = type;
|
|
gs->name = name ? xstrdup(name) : NULL;
|
|
gs->buf = NULL;
|
|
gs->size = 0;
|
|
|
|
switch (type) {
|
|
case GREP_SOURCE_FILE:
|
|
gs->identifier = xstrdup(identifier);
|
|
break;
|
|
case GREP_SOURCE_SHA1:
|
|
gs->identifier = xmalloc(20);
|
|
memcpy(gs->identifier, identifier, 20);
|
|
break;
|
|
case GREP_SOURCE_BUF:
|
|
gs->identifier = NULL;
|
|
}
|
|
}
|
|
|
|
void grep_source_clear(struct grep_source *gs)
|
|
{
|
|
free(gs->name);
|
|
gs->name = NULL;
|
|
free(gs->identifier);
|
|
gs->identifier = NULL;
|
|
grep_source_clear_data(gs);
|
|
}
|
|
|
|
void grep_source_clear_data(struct grep_source *gs)
|
|
{
|
|
switch (gs->type) {
|
|
case GREP_SOURCE_FILE:
|
|
case GREP_SOURCE_SHA1:
|
|
free(gs->buf);
|
|
gs->buf = NULL;
|
|
gs->size = 0;
|
|
break;
|
|
case GREP_SOURCE_BUF:
|
|
/* leave user-provided buf intact */
|
|
break;
|
|
}
|
|
}
|
|
|
|
static int grep_source_load_sha1(struct grep_source *gs)
|
|
{
|
|
enum object_type type;
|
|
|
|
grep_read_lock();
|
|
gs->buf = read_sha1_file(gs->identifier, &type, &gs->size);
|
|
grep_read_unlock();
|
|
|
|
if (!gs->buf)
|
|
return error(_("'%s': unable to read %s"),
|
|
gs->name,
|
|
sha1_to_hex(gs->identifier));
|
|
return 0;
|
|
}
|
|
|
|
static int grep_source_load_file(struct grep_source *gs)
|
|
{
|
|
const char *filename = gs->identifier;
|
|
struct stat st;
|
|
char *data;
|
|
size_t size;
|
|
int i;
|
|
|
|
if (lstat(filename, &st) < 0) {
|
|
err_ret:
|
|
if (errno != ENOENT)
|
|
error(_("'%s': %s"), filename, strerror(errno));
|
|
return -1;
|
|
}
|
|
if (!S_ISREG(st.st_mode))
|
|
return -1;
|
|
size = xsize_t(st.st_size);
|
|
i = open(filename, O_RDONLY);
|
|
if (i < 0)
|
|
goto err_ret;
|
|
data = xmalloc(size + 1);
|
|
if (st.st_size != read_in_full(i, data, size)) {
|
|
error(_("'%s': short read %s"), filename, strerror(errno));
|
|
close(i);
|
|
free(data);
|
|
return -1;
|
|
}
|
|
close(i);
|
|
data[size] = 0;
|
|
|
|
gs->buf = data;
|
|
gs->size = size;
|
|
return 0;
|
|
}
|
|
|
|
int grep_source_load(struct grep_source *gs)
|
|
{
|
|
if (gs->buf)
|
|
return 0;
|
|
|
|
switch (gs->type) {
|
|
case GREP_SOURCE_FILE:
|
|
return grep_source_load_file(gs);
|
|
case GREP_SOURCE_SHA1:
|
|
return grep_source_load_sha1(gs);
|
|
case GREP_SOURCE_BUF:
|
|
return gs->buf ? 0 : -1;
|
|
}
|
|
die("BUG: invalid grep_source type");
|
|
}
|