first commit

expr.hpp

@@ -0,0 +1,138 @@
+#pragma once
+
+#include <cstdint>
+
+struct IntValue;
+struct FloatValue;
+struct NegOperation;
+struct AddOperation;
+struct SubOperation;
+struct MulOperation;
+struct DivOperation;
+
+struct Visitor {
+    virtual void visit_int(IntValue *node) = 0;
+    virtual void visit_float(FloatValue *node) = 0;
+    virtual void visit_neg(NegOperation *node) = 0;
+    virtual void visit_add(AddOperation *node) = 0;
+    virtual void visit_sub(SubOperation *node) = 0;
+    virtual void visit_mul(MulOperation *node) = 0;
+    virtual void visit_div(DivOperation *node) = 0;
+};
+
+struct Expr {
+    virtual void visit(Visitor &visitor) = 0;
+};
+
+struct IntValue : Expr {
+
+    int64_t val;
+
+    IntValue(int64_t val_)
+    {
+        val = val_;
+    }
+
+    virtual void visit(Visitor &visitor)
+    {
+        visitor.visit_int(this);
+    }
+};
+
+struct FloatValue : Expr {
+
+    double val;
+
+    FloatValue(double val_)
+    {
+        val = val_;
+    }
+
+    virtual void visit(Visitor &visitor)
+    {
+        visitor.visit_float(this);
+    }
+};
+
+struct NegOperation : Expr {
+
+    Expr *op;
+
+    NegOperation(Expr *op_)
+    {
+        op = op_;
+    }
+
+    virtual void visit(Visitor &visitor)
+    {
+        visitor.visit_neg(this);
+    }
+};
+
+struct AddOperation : Expr {
+
+    Expr *lhs;
+    Expr *rhs;
+
+    AddOperation(Expr *lhs_, Expr *rhs_)
+    {
+        lhs = lhs_;
+        rhs = rhs_;
+    }
+
+    virtual void visit(Visitor &visitor)
+    {
+        visitor.visit_add(this);
+    }
+};
+
+struct SubOperation : Expr {
+
+    Expr *lhs;
+    Expr *rhs;
+
+    SubOperation(Expr *lhs_, Expr *rhs_)
+    {
+        lhs = lhs_;
+        rhs = rhs_;
+    }
+
+    virtual void visit(Visitor &visitor)
+    {
+        visitor.visit_sub(this);
+    }
+};
+
+struct MulOperation : Expr {
+
+    Expr *lhs;
+    Expr *rhs;
+
+    MulOperation(Expr *lhs_, Expr *rhs_)
+    {
+        lhs = lhs_;
+        rhs = rhs_;
+    }
+
+    virtual void visit(Visitor &visitor)
+    {
+        visitor.visit_mul(this);
+    }
+};
+
+struct DivOperation : Expr {
+
+    Expr *lhs;
+    Expr *rhs;
+
+    DivOperation(Expr *lhs_, Expr *rhs_)
+    {
+        lhs = lhs_;
+        rhs = rhs_;
+    }
+
+    virtual void visit(Visitor &visitor)
+    {
+        visitor.visit_div(this);
+    }
+};