From: Jens Vollinga <jensv@nikhef.nl>
Date: Wed, 15 Jul 2009 03:19:07 +0000 (+0200)
Subject: Allow underscores in identifiers.
X-Git-Tag: release_1-5-3~1
X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?a=commitdiff_plain;h=44f71c740cc727dc30436e240b9a27021a6d7fdf;p=ginac.git

Allow underscores in identifiers.
(cherry picked from commit 619879b5bd86a99334affe1f05d17616cc2c1898)
---

diff --git a/ginac/parser/lexer.cpp b/ginac/parser/lexer.cpp
index 1cc2f496..cc3be3d9 100644
--- a/ginac/parser/lexer.cpp
+++ b/ginac/parser/lexer.cpp
@@ -43,12 +43,12 @@ int lexer::gettok()
 	// Skip any whitespace.
 	c = skipspace(input, c, line_num);
 
-	// identifier: [a-zA-Z][a-zA-Z0-9]*
+	// identifier: [a-zA-Z][a-zA-Z0-9_]*
 	if (isalpha(c)) { 
 		str = c;
 		do {
 			c = input->get();
-			if (isalnum(c))
+			if ( isalnum(c) || c=='_' )
 				str += c;
 			else
 				break;