Add booleans

parser.y

@@ -96,7 +96,7 @@ primary_expression
   : IDENTIFIER { $$ = new expr_id(*$1); delete $1; }
   | FLOAT { $$ = new expr_float(std::stod(*$1)); delete $1; }
   | INTEGER { $$ = new expr_int(std::stoi(*$1)); delete $1; }
-  | BOOLEAN { $$ = new expr_int(*$1 == "True"); delete $1; }
+  | BOOLEAN { $$ = new expr_bool(*$1 == "True"); delete $1; }
   | LPAREN expression RPAREN { $$ = $2; }
   ;
 

tree.cpp

@@ -16,6 +16,11 @@ std::string label<const char*>(const char* v) {
     return v;
 }
 
+template <>
+std::string label<bool>(bool v) {
+    return v ? "TRUE" : "FALSE";
+}
+
 template <>
 std::string label<binop>(binop op) {
     switch(op) {
@@ -67,12 +72,16 @@ void expr_id::print_dot(dot& into, std::string prefix) {
     into.push_back(prefix + wrap_label(std::string("identifier: ") + id, true));
 }
 
+void expr_bool::print_dot(dot& into, std::string prefix) {
+    into.push_back(prefix + wrap_label(std::string("Boolean: ") + label(val), true));
+}
+
 void expr_int::print_dot(dot& into, std::string prefix) {
-    into.push_back(prefix + wrap_label(std::string("integer: ") + label(val), true));
+    into.push_back(prefix + wrap_label(std::string("Integer: ") + label(val), true));
 }
 
 void expr_float::print_dot(dot& into, std::string prefix) {
-    into.push_back(prefix + wrap_label(std::string("float: ") + label(val), true));
+    into.push_back(prefix + wrap_label(std::string("Float: ") + label(val), true));
 }
 
 void expr_binop::print_dot(dot& into, std::string prefix) {

tree.hpp

@@ -41,6 +41,14 @@ struct expr_id : expr {
     virtual void print_dot(dot& into, std::string prefix);
 };
 
+struct expr_bool : expr {
+    bool val;
+
+    expr_bool(bool v) : val(v) {}
+
+    virtual void print_dot(dot& into, std::string prefix);
+};
+
 struct expr_int : expr {
     int val;