optimizations

internal/ast/ast.go

@@ -127,6 +127,7 @@ func (b *Boolean) expressionNode()      {}
 func (b *Boolean) TokenLiteral() string { return b.Token.Literal }
 func (b *Boolean) String() string       { return b.Token.Literal }
 
+// IntegerLiteral represents a literal integer number and holds an int64 value
 type IntegerLiteral struct {
 	Token token.Token
 	Value int64
@@ -136,6 +137,20 @@ func (il *IntegerLiteral) expressionNode()      {}
 func (il *IntegerLiteral) TokenLiteral() string { return il.Token.Literal }
 func (il *IntegerLiteral) String() string       { return il.Token.Literal }
 
+// FloatLiteral represents a literal floating point number and holds an float64 value
+type FloatLiteral struct {
+	Token token.Token
+	Value float64
+}
+
+func (fl *FloatLiteral) expressionNode() {}
+
+// TokenLiteral prints the literal value of the token associated with this node
+func (fl *FloatLiteral) TokenLiteral() string { return fl.Token.Literal }
+
+// String returns a stringified version of the AST for debugging
+func (fl *FloatLiteral) String() string { return fl.Token.Literal }
+
 type PrefixExpression struct {
 	Token    token.Token // The prefix token, e.g. !
 	Operator string