Extra Features

ast/ast.go

@@ -356,3 +356,26 @@ func (hl HashLiteral) String() string {
 }
 
 func (hl HashLiteral) expressionNode() {}
+
+type WhileExpression struct {
+	Token       token.Token // The 'while' token
+	Condition   Expression
+	Consequence *BlockStatement
+}
+
+func (we *WhileExpression) expressionNode() {}
+
+// TokenLiteral prints the literal value of the token associated with this node
+func (we *WhileExpression) TokenLiteral() string { return we.Token.Literal }
+
+// String returns a stringified version of the AST for debugging
+func (we *WhileExpression) String() string {
+	var out bytes.Buffer
+
+	out.WriteString("while")
+	out.WriteString(we.Condition.String())
+	out.WriteString(" ")
+	out.WriteString(we.Consequence.String())
+
+	return out.String()
+}