1 files changed, 53 insertions, 0 deletions
diff --git a/pidl/lib/Parse/Pidl/Base.pm b/pidl/lib/Parse/Pidl/Base.pm
index e89a48d2155..056b7b37d48 100644
--- a/pidl/lib/Parse/Pidl/Base.pm
+++ b/pidl/lib/Parse/Pidl/Base.pm
@@ -44,3 +44,56 @@ sub pidl_both {
 	$self->{res} .= "$txt\n";
 	$self->{res_hdr} .= "$txt\n";
 }
+
+
+# When the PIDL_DEVELOPER env flag is set, we overwrite $self->pidl()
+# and $self->pidl_hdr() to annotate the output with location
+# information.
+
+sub pidl_dev_msg {
+	my $self = shift;
+	my ($pkg, $file, $line, $sub) = caller(2);
+	# minimise the path
+	if ($file =~ m{/pidl/(lib/.+|pidl)$}) {
+		$file = $1;
+	}
+	my $state = $self->{dev_state} // ['uninitialised', 0, ''];
+	my ($ploc, $pline, $ptabs) = @$state;
+	my $loc = "$sub	 $file";
+
+	if ($loc ne $ploc or
+	    abs($line - $pline) > 20 or
+	    $self->{tabs} ne $ptabs) {
+		$self->{dev_state} = [$loc, $line, $self->{tabs}];
+		return "  //<PIDL> $loc:$line";
+	}
+	return '';
+}
+
+
+if ($ENV{PIDL_DEVELOPER}) {
+	undef &pidl;
+	undef &pidl_hdr;
+
+	*Parse::Pidl::Base::pidl = sub {
+		my ($self, $txt) = @_;
+
+		if ($txt) {
+			if ($txt !~ /^#/) {
+				$self->{res} .= $self->{tabs};
+			}
+			$self->{res} .= $txt;
+		}
+		$self->{res} .= $self->pidl_dev_msg;
+		$self->{res} .= "\n";
+	};
+
+	*Parse::Pidl::Base::pidl_hdr = sub {
+		my ($self, $txt) = @_;
+		$txt .= $self->pidl_dev_msg;
+		$self->{res_hdr} .= "$txt\n";
+	}
+}
+
+
+1;