From 99901bd5c74203caece07e3e2948780887a0e822 Mon Sep 17 00:00:00 2001
From: Jens Vollinga <jens.vollinga@googlemail.com>
Date: Fri, 28 Oct 2011 21:09:33 +0200
Subject: [PATCH] Parser can now read GiNaC lists (lst) defined by braces. This
 commit completes the bug fix in commit
 9a4f392521083d28e1c238e7898ab1d2ac5b73cd.

---
 ginac/parser/parser.cpp | 30 ++++++++++++++++++++++++++++++
 ginac/parser/parser.h   |  3 +++
 2 files changed, 33 insertions(+)

diff --git a/ginac/parser/parser.cpp b/ginac/parser/parser.cpp
index 992b1510..de6b269a 100644
--- a/ginac/parser/parser.cpp
+++ b/ginac/parser/parser.cpp
@@ -120,6 +120,34 @@ ex parser::parse_paren_expr()
 	return e;
 }
 
+/// lst_expr:  '{' expression { ',' expression } '}'
+ex parser::parse_lst_expr()
+{
+	get_next_tok();  // eat {.
+
+	lst list;
+	if (token != '}') {
+		while (true) {
+			ex e = parse_expression(); // expression();
+			list.append(e);
+
+			if (token == '}') {
+				break;
+			}
+
+			if (token != ',') {
+				Parse_error("expected '}'");
+			}
+
+			get_next_tok();  // eat ','.
+		}
+	}
+	// Eat the '}'.
+	get_next_tok();
+
+	return list;
+}
+
 extern const ex _ex0;
 
 /// unary_expr: [+-] expression
@@ -151,6 +179,8 @@ ex parser::parse_primary()
 			 return parse_number_expr();
 		case '(': 
 			 return parse_paren_expr();
+		case '{': 
+			 return parse_lst_expr();
 		case '-':
 		case '+':
 			 return parse_unary_expr();
diff --git a/ginac/parser/parser.h b/ginac/parser/parser.h
index ac57a798..cab02c39 100644
--- a/ginac/parser/parser.h
+++ b/ginac/parser/parser.h
@@ -67,6 +67,9 @@ class parser
 	/// paren_expr: '(' expression ')'
 	ex parse_paren_expr();
 
+	/// lst_expr: '{' expression { ',' expression } '}'
+	ex parse_lst_expr();
+
 	/// number_expr: number
 	ex parse_number_expr();
 
-- 
2.44.0