X-Git-Url: https://ginac.de/ginac.git//ginac.git?a=blobdiff_plain;f=ginac%2Fparser%2Flexer.cpp;h=3545ba9ac393ac4a6c8b6adf62e026de2428c2f8;hb=55a08d9cb9005bb10def92d5e8f5a816003da16b;hp=7b00c4aef560a8f00d4976ef0250049325548e44;hpb=80b1c3e0ee0e465d56e5c76bef4e52ef2dbc5197;p=ginac.git

diff --git a/ginac/parser/lexer.cpp b/ginac/parser/lexer.cpp
index 7b00c4ae..3545ba9a 100644
--- a/ginac/parser/lexer.cpp
+++ b/ginac/parser/lexer.cpp
@@ -1,11 +1,35 @@
-#include <string>
-#include <iostream>
-#include <sstream>
+/** @file lexer.cpp
+ *
+ *  Implementation of GiNaC's lexer. */
+
+/*
+ *  GiNaC Copyright (C) 1999-2014 Johannes Gutenberg University Mainz, Germany
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
 #include "lexer.h"
 #include "compiler.h"
 
-namespace GiNaC
-{
+#include <iostream>
+#include <sstream>
+#include <string>
+#include <cstdio>
+
+namespace GiNaC {
+
 /// Skip to the end of line
 static int skipline(std::istream* s);
 /// Skip to the next non-whitespace character
@@ -19,12 +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;
@@ -154,4 +178,3 @@ std::string lexer::tok2str(const int tok) const
 }
 
 } // namespace GiNaC
-