Added untested parser code, meaning most of chapter 6 has been implemented (but most likely, very poorly).

expr.h

@@ -12,26 +12,26 @@ typedef enum {
     OPERATOR
 } ExpressionType;
 
-typedef struct Expr expression;
+typedef struct Expr Expr;
 
 struct binary {
-    Expr* left;
-    TokenType op;
-    Expr* right;
+    struct Expr* left;
+    Token* op;
+    struct Expr* right;
 };
 
 struct grouping {
-    Expr* expression;
+    struct Expr* expression;
 };
 
 struct literal {
-    TokenType type; //Probably something to this effect.
+    Token* type;
     void* object;
 };
 
 struct unary {
-    TokenType op;
-    Expr* right;
+    Token* op;
+    struct Expr* right;
 };
 
 struct Expr {
@@ -44,4 +44,9 @@ struct Expr {
     } expression;
 };
 
+void VisitBinary(struct binary);
+void VisitGrouping(struct grouping);
+void VisitLiteral(struct literal);
+void VisitUnary(struct unary);
+
 #endif