Make if/else statements case insensitive. (#1041)

modcc/token.cpp

@@ -55,7 +55,9 @@ static Keyword keywords[] = {
     {"METHOD",      tok::method},
     {"STEADYSTATE", tok::steadystate},
     {"if",          tok::if_stmt},
+    {"IF",          tok::if_stmt},
     {"else",        tok::else_stmt},
+    {"ELSE",        tok::else_stmt},
     {"cnexp",       tok::cnexp},
     {"sparse",      tok::sparse},
     {"min",         tok::min},

test/unit-modcc/test_parser.cpp

@@ -280,6 +280,19 @@ TEST(Parser, parse_if) {
         EXPECT_NE(s->false_branch(), nullptr);
     }
 
+    EXPECT_TRUE(check_parse(s, &Parser::parse_if,
+        "   IF(a<b) {      \n"
+        "       a = 2+b    \n"
+        "   } ELSE {       \n"
+        "       a = 2+b    \n"
+        "   }                "
+    ));
+    if (s) {
+        EXPECT_NE(s->condition()->is_binary(), nullptr);
+        EXPECT_NE(s->true_branch()->is_block(), nullptr);
+        EXPECT_NE(s->false_branch(), nullptr);
+    }
+
     EXPECT_TRUE(check_parse(s, &Parser::parse_if,
         "   if(fabs(a-b)) {      \n"
         "       a = 2+b    \n"