static int match_expr_eval(struct grep_opt *o,
struct grep_expr *x,
char *bol, char *eol,
enum grep_context ctx,
int collect_hits)
{
int h = 0;
switch (x->node) {
case GREP_NODE_ATOM:
h = match_one_pattern(o, x->u.atom, bol, eol, ctx);
break;
case GREP_NODE_NOT:
h = !match_expr_eval(o, x->u.unary, bol, eol, ctx, 0);
break;
case GREP_NODE_AND:
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:
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);
}
if (collect_hits)
x->hit |= h;
return h;
}
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);
}