GIT-VERSION-FILE: check ./version first.

[thirdparty/git.git] / grep.c

diff --git a/grep.c b/grep.c
index c411ddd4d52e2aa68edd979733dd0b15f51d5f32..fcc676230282e4c5bda4f9f97c5ae65c1a6beb30 100644 (file)
--- a/grep.c
+++ b/grep.c
@@ -1,5 +1,4 @@
 #include "cache.h"
-#include <regex.h>
 #include "grep.h"
 
 void append_grep_pattern(struct grep_opt *opt, const char *pat,
@@ -34,7 +33,7 @@ static void compile_regexp(struct grep_pat *p, struct grep_opt *opt)
        }
 }
 
-static struct grep_expr *compile_pattern_expr(struct grep_pat **);
+static struct grep_expr *compile_pattern_or(struct grep_pat **);
 static struct grep_expr *compile_pattern_atom(struct grep_pat **list)
 {
        struct grep_pat *p;
@@ -52,7 +51,7 @@ static struct grep_expr *compile_pattern_atom(struct grep_pat **list)
                return x;
        case GREP_OPEN_PAREN:
                *list = p->next;
-               x = compile_pattern_expr(list);
+               x = compile_pattern_or(list);
                if (!x)
                        return NULL;
                if (!*list || (*list)->token != GREP_CLOSE_PAREN)
@@ -138,6 +137,9 @@ void compile_grep_patterns(struct grep_opt *opt)
 {
        struct grep_pat *p;
 
+       if (opt->all_match)
+               opt->extended = 1;
+
        for (p = opt->pattern_list; p; p = p->next) {
                switch (p->token) {
                case GREP_PATTERN: /* atom */
@@ -309,40 +311,63 @@ static int match_one_pattern(struct grep_opt *opt, struct grep_pat *p, char *bol
        return hit;
 }
 
-static int match_expr_eval(struct grep_opt *opt,
+static int match_expr_eval(struct grep_opt *o,
                           struct grep_expr *x,
                           char *bol, char *eol,
-                          enum grep_context ctx)
+                          enum grep_context ctx,
+                          int collect_hits)
 {
+       int h = 0;
+
        switch (x->node) {
        case GREP_NODE_ATOM:
-               return match_one_pattern(opt, x->u.atom, bol, eol, ctx);
+               h = match_one_pattern(o, x->u.atom, bol, eol, ctx);
                break;
        case GREP_NODE_NOT:
-               return !match_expr_eval(opt, x->u.unary, bol, eol, ctx);
+               h = !match_expr_eval(o, x->u.unary, bol, eol, ctx, 0);
+               break;
        case GREP_NODE_AND:
-               return (match_expr_eval(opt, x->u.binary.left, bol, eol, ctx) &&
-                       match_expr_eval(opt, x->u.binary.right, bol, eol, ctx));
+               if (!collect_hits)
+                       return (match_expr_eval(o, x->u.binary.left,
+                                               bol, eol, ctx, 0) &&
+                               match_expr_eval(o, x->u.binary.right,
+                                               bol, eol, ctx, 0));
+               h = match_expr_eval(o, x->u.binary.left, bol, eol, ctx, 0);
+               h &= match_expr_eval(o, x->u.binary.right, bol, eol, ctx, 0);
+               break;
        case GREP_NODE_OR:
-               return (match_expr_eval(opt, x->u.binary.left, bol, eol, ctx) ||
-                       match_expr_eval(opt, x->u.binary.right, bol, eol, ctx));
+               if (!collect_hits)
+                       return (match_expr_eval(o, x->u.binary.left,
+                                               bol, eol, ctx, 0) ||
+                               match_expr_eval(o, x->u.binary.right,
+                                               bol, eol, ctx, 0));
+               h = match_expr_eval(o, x->u.binary.left, bol, eol, ctx, 0);
+               x->u.binary.left->hit |= h;
+               h |= match_expr_eval(o, x->u.binary.right, bol, eol, ctx, 1);
+               break;
+       default:
+               die("Unexpected node type (internal error) %d\n", x->node);
        }
-       die("Unexpected node type (internal error) %d\n", 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)
+                     enum grep_context ctx, int collect_hits)
 {
        struct grep_expr *x = opt->pattern_expression;
-       return match_expr_eval(opt, x, bol, eol, ctx);
+       return match_expr_eval(opt, x, bol, eol, ctx, collect_hits);
 }
 
 static int match_line(struct grep_opt *opt, char *bol, char *eol,
-                     enum grep_context ctx)
+                     enum grep_context ctx, int collect_hits)
 {
        struct grep_pat *p;
        if (opt->extended)
-               return match_expr(opt, bol, eol, ctx);
+               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(opt, p, bol, eol, ctx))
                        return 1;
@@ -350,7 +375,8 @@ static int match_line(struct grep_opt *opt, char *bol, char *eol,
        return 0;
 }
 
-int grep_buffer(struct grep_opt *opt, const char *name, char *buf, unsigned long size)
+static int grep_buffer_1(struct grep_opt *opt, const char *name,
+                        char *buf, unsigned long size, int collect_hits)
 {
        char *bol = buf;
        unsigned long left = size;
@@ -386,7 +412,7 @@ int grep_buffer(struct grep_opt *opt, const char *name, char *buf, unsigned long
 
        while (left) {
                char *eol, ch;
-               int hit = 0;
+               int hit;
 
                eol = end_of_line(bol, &left);
                ch = *eol;
@@ -395,9 +421,12 @@ int grep_buffer(struct grep_opt *opt, const char *name, char *buf, unsigned long
                if ((ctx == GREP_CONTEXT_HEAD) && (eol == bol))
                        ctx = GREP_CONTEXT_BODY;
 
-               hit = match_line(opt, bol, eol, ctx);
+               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.
@@ -477,6 +506,8 @@ int grep_buffer(struct grep_opt *opt, const char *name, char *buf, unsigned long
        }
 
        free(prev);
+       if (collect_hits)
+               return 0;
 
        if (opt->status_only)
                return 0;
@@ -496,3 +527,49 @@ int grep_buffer(struct grep_opt *opt, const char *name, char *buf, unsigned long
        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_buffer(struct grep_opt *opt, const char *name, char *buf, unsigned long size)
+{
+       /*
+        * 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_buffer_1(opt, name, buf, size, 0);
+
+       /* Otherwise the toplevel "or" terms hit a bit differently.
+        * We first clear hit markers from them.
+        */
+       clr_hit_marker(opt->pattern_expression);
+       grep_buffer_1(opt, name, buf, size, 1);
+
+       if (!chk_hit_marker(opt->pattern_expression))
+               return 0;
+
+       return grep_buffer_1(opt, name, buf, size, 0);
+}