From bdffa974937def0945d578c01b0122e6addba766 Mon Sep 17 00:00:00 2001
From: Donald Buczek <buczek@molgen.mpg.de>
Date: Thu, 16 Dec 2021 14:32:02 +0100
Subject: [PATCH] parser.y: Allow '_' in identifier

Allow identifier in expressions to contain an underliner.
---
 parser.y | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/parser.y b/parser.y
index ea40c871..835486cc 100644
--- a/parser.y
+++ b/parser.y
@@ -65,7 +65,7 @@ int yylex (YYSTYPE *lvalp, YYLTYPE *llocp, struct parser_context *ctx) {
     if (isalpha (c))
     {
         size_t name_len = 1;
-        while(isalnum(ctx->input[ctx->pos+name_len]))
+        while(isalnum(ctx->input[ctx->pos+name_len]) || ctx->input[ctx->pos+name_len] == '_')
             name_len++;
         char *name=xstrndup(&ctx->input[ctx->pos], name_len);
         ctx->pos += name_len;