From 09613feb458154665d2e1cff9c8d4d7285ff0c82 Mon Sep 17 00:00:00 2001
From: Martin Mares <mj@ucw.cz>
Date: Fri, 12 Oct 2012 22:58:29 +0200
Subject: [PATCH] Avoid reporting a single error multiple times

One day, we might want to get a proper backtrace, but in the meantime
it is easier to avoid wrapping a single error in several layers of
line number info, which are often wrong, as we do not clear the position
stack in error paths.
---
 UCW/Temple.pm | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/UCW/Temple.pm b/UCW/Temple.pm
index 98aea96..e1a21e3 100644
--- a/UCW/Temple.pm
+++ b/UCW/Temple.pm
@@ -32,10 +32,11 @@ sub add_depend($) {
 my $current_file_name;
 my $current_string;
 my $current_pos;
+my $reported_error;
 
 sub error($;$) {
 	my ($msg, $offset) = @_;
-	if (defined $current_file_name) {
+	if (defined $current_file_name && !$reported_error) {
 		#
 		#  This is rather tricky. We want to report the exact place, where the error
 		#  occurred, but the cost of keeping track of the current line number is too high.
@@ -45,6 +46,7 @@ sub error($;$) {
 		my $input = substr(${$current_string}, 0, $current_pos);
 		my @newlines = ($input =~ m{\n}g);
 		my $line = @newlines + ($offset // 1);
+		$reported_error++;
 		die "$current_file_name:$line: $msg\n";
 	} else {
 		die "$msg\n";
@@ -184,6 +186,7 @@ sub parse_file($) {
 sub start(;$) {
 	$arguments = $_[0];
 	@cond = (1);
+	$reported_error = 0;
 }
 
 sub finish() {
-- 
2.39.2