parse infix operators

1 files changed, 27 insertions, 0 deletions

diff --git a/ast/ast.go b/ast/ast.go
index 021b387..1942a68 100644
--- a/ast/ast.go
+++ b/ast/ast.go
@@ -151,6 +151,33 @@ func (pe *PrefixExpression) String() string {
 	return out.String()
 }
 
+// InfixExpression represents an infix expression.
+
+type InfixExpression struct {
+	Token    tokens.Token // the operator token, e.g. +
+	Left     Expression
+	Operator string
+	Right    Expression
+}
+
+func (ie *InfixExpression) expressionNode() {}
+func (ie *InfixExpression) TokenLiteral() string {
+	return ie.Token.Literal
+}
+func (ie *InfixExpression) String() string {
+	var out bytes.Buffer
+
+
+	out.WriteString("(")
+	out.WriteString(ie.Left.String())
+	out.WriteString(" " + ie.Operator + " ")
+	out.WriteString(ie.Right.String())
+	out.WriteString(")")
+
+	return out.String()
+}
+
+
 // IntegerLiteral represents an integer literal.
 type IntegerLiteral struct {
 	Token tokens.Token // the token.INT token