feat: parser

pkg/lambda/expression.go

@@ -0,0 +1,23 @@
+package lambda
+
+type Expression interface {
+	isExpression()
+}
+
+type Function struct {
+	Parameter string
+	Body Expression
+}
+
+type Call struct {
+	Function Expression
+	Argument Expression
+}
+
+type Atom struct {
+	Value string
+}
+
+func (_ Function) isExpression() {}
+func (_ Call) isExpression() {}
+func (_ Atom) isExpression() {}