From 95ce9ce296e1636a2b78e73b96905d781ef2ddc7 Mon Sep 17 00:00:00 2001
From: Junio C Hamano <gitster@pobox.com>
Date: Sun, 12 Sep 2010 19:30:48 -0700
Subject: [PATCH] grep: move logic to compile header pattern into a separate
 helper

The callers should be queuing only GREP_PATTERN_HEAD elements to the
header_list queue; simplify the switch and guard it with an assert.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 grep.c | 45 ++++++++++++++++++++++-----------------------
 1 file changed, 22 insertions(+), 23 deletions(-)

diff --git a/grep.c b/grep.c
index 82fb349be6..718a3c2346 100644
--- a/grep.c
+++ b/grep.c
@@ -189,29 +189,31 @@ static struct grep_expr *compile_pattern_expr(struct grep_pat **list)
 	return compile_pattern_or(list);
 }
 
+static struct grep_expr *prep_header_patterns(struct grep_opt *opt)
+{
+	struct grep_pat *p;
+	struct grep_expr *header_expr;
+
+	if (!opt->header_list)
+		return NULL;
+	p = opt->header_list;
+	header_expr = compile_pattern_expr(&p);
+	if (p)
+		die("incomplete pattern expression: %s", p->pattern);
+	for (p = opt->header_list; p; p = p->next) {
+		if (p->token != GREP_PATTERN_HEAD)
+			die("bug: a non-header pattern in grep header list.");
+		if (p->field < 0 || GREP_HEADER_FIELD_MAX <= p->field)
+			die("bug: unknown header field %d", p->field);
+		compile_regexp(p, opt);
+	}
+	return header_expr;
+}
+
 void compile_grep_patterns(struct grep_opt *opt)
 {
 	struct grep_pat *p;
-	struct grep_expr *header_expr = NULL;
-
-	if (opt->header_list) {
-		p = opt->header_list;
-		header_expr = compile_pattern_expr(&p);
-		if (p)
-			die("incomplete pattern expression: %s", p->pattern);
-		for (p = opt->header_list; p; p = p->next) {
-			switch (p->token) {
-			case GREP_PATTERN: /* atom */
-			case GREP_PATTERN_HEAD:
-			case GREP_PATTERN_BODY:
-				compile_regexp(p, opt);
-				break;
-			default:
-				opt->extended = 1;
-				break;
-			}
-		}
-	}
+	struct grep_expr *header_expr = prep_header_patterns(opt);
 
 	for (p = opt->pattern_list; p; p = p->next) {
 		switch (p->token) {
@@ -231,9 +233,6 @@ void compile_grep_patterns(struct grep_opt *opt)
 	else if (!opt->extended)
 		return;
 
-	/* Then bundle them up in an expression.
-	 * A classic recursive descent parser would do.
-	 */
 	p = opt->pattern_list;
 	if (p)
 		opt->pattern_expression = compile_pattern_expr(&p);