From 160d84fb761c54a5f757aff907fc197d259196bd Mon Sep 17 00:00:00 2001
From: Phil Sutter <psutter@redhat.com>
Date: Mon, 17 Feb 2020 15:26:42 +0100
Subject: [PATCH] parser: add a helper for concat expression handling

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1795224
Upstream Status: nftables commit 10f114806ccd9

commit 10f114806ccd9d64f9d72eaa813babb04d719688
Author: Florian Westphal <fw@strlen.de>
Date:   Wed Dec 11 14:31:44 2019 +0100

    parser: add a helper for concat expression handling

    Cull the repeated copy&paste snippets and add/use a helper for this.

    Signed-off-by: Florian Westphal <fw@strlen.de>
---
 src/parser_bison.y | 99 ++++++++++++++++++++++++------------------------------
 1 file changed, 43 insertions(+), 56 deletions(-)

diff --git a/src/parser_bison.y b/src/parser_bison.y
index 707f467..0fd9b94 100644
--- a/src/parser_bison.y
+++ b/src/parser_bison.y
@@ -102,6 +102,25 @@ static void location_update(struct location *loc, struct location *rhs, int n)
 	}
 }
 
+static struct expr *handle_concat_expr(const struct location *loc,
+					 struct expr *expr,
+					 struct expr *expr_l, struct expr *expr_r,
+					 struct location loc_rhs[3])
+{
+	if (expr->etype != EXPR_CONCAT) {
+		expr = concat_expr_alloc(loc);
+		compound_expr_add(expr, expr_l);
+	} else {
+		location_update(&expr_r->location, loc_rhs, 2);
+
+		expr = expr_l;
+		expr->location = *loc;
+	}
+
+	compound_expr_add(expr, expr_r);
+	return expr;
+}
+
 #define YYLLOC_DEFAULT(Current, Rhs, N)	location_update(&Current, Rhs, N)
 
 #define symbol_value(loc, str) \
@@ -1878,20 +1897,12 @@ data_type_atom_expr	:	type_identifier
 data_type_expr		:	data_type_atom_expr
 			|	data_type_expr	DOT	data_type_atom_expr
 			{
-				if ($1->etype != EXPR_CONCAT) {
-					$$ = concat_expr_alloc(&@$);
-					compound_expr_add($$, $1);
-				} else {
-					struct location rhs[] = {
-						[1]	= @2,
-						[2]	= @3,
-					};
-					location_update(&$3->location, rhs, 2);
-
-					$$ = $1;
-					$$->location = @$;
-				}
-				compound_expr_add($$, $3);
+				struct location rhs[] = {
+					[1]	= @2,
+					[2]	= @3,
+				};
+
+				$$ = handle_concat_expr(&@$, $$, $1, $3, rhs);
 			}
 			;
 
@@ -2992,20 +3003,12 @@ basic_stmt_expr		:	inclusive_or_stmt_expr
 concat_stmt_expr	:	basic_stmt_expr
 			|	concat_stmt_expr	DOT	primary_stmt_expr
 			{
-				if ($$->etype != EXPR_CONCAT) {
-					$$ = concat_expr_alloc(&@$);
-					compound_expr_add($$, $1);
-				} else {
-					struct location rhs[] = {
-						[1]	= @2,
-						[2]	= @3,
-					};
-					location_update(&$3->location, rhs, 2);
-
-					$$ = $1;
-					$$->location = @$;
-				}
-				compound_expr_add($$, $3);
+				struct location rhs[] = {
+					[1]	= @2,
+					[2]	= @3,
+				};
+
+				$$ = handle_concat_expr(&@$, $$, $1, $3, rhs);
 			}
 			;
 
@@ -3525,20 +3528,12 @@ basic_expr		:	inclusive_or_expr
 concat_expr		:	basic_expr
 			|	concat_expr		DOT		basic_expr
 			{
-				if ($$->etype != EXPR_CONCAT) {
-					$$ = concat_expr_alloc(&@$);
-					compound_expr_add($$, $1);
-				} else {
-					struct location rhs[] = {
-						[1]	= @2,
-						[2]	= @3,
-					};
-					location_update(&$3->location, rhs, 2);
-
-					$$ = $1;
-					$$->location = @$;
-				}
-				compound_expr_add($$, $3);
+				struct location rhs[] = {
+					[1]	= @2,
+					[2]	= @3,
+				};
+
+				$$ = handle_concat_expr(&@$, $$, $1, $3, rhs);
 			}
 			;
 
@@ -3946,20 +3941,12 @@ basic_rhs_expr		:	inclusive_or_rhs_expr
 concat_rhs_expr		:	basic_rhs_expr
 			|	concat_rhs_expr	DOT	basic_rhs_expr
 			{
-				if ($$->etype != EXPR_CONCAT) {
-					$$ = concat_expr_alloc(&@$);
-					compound_expr_add($$, $1);
-				} else {
-					struct location rhs[] = {
-						[1]	= @2,
-						[2]	= @3,
-					};
-					location_update(&$3->location, rhs, 2);
-
-					$$ = $1;
-					$$->location = @$;
-				}
-				compound_expr_add($$, $3);
+				struct location rhs[] = {
+					[1]	= @2,
+					[2]	= @3,
+				};
+
+				$$ = handle_concat_expr(&@$, $$, $1, $3, rhs);
 			}
 			;
 
-- 
1.8.3.1