wip: new folder structure, overhaul language

pkg/saccharine/ast.go

@@ -0,0 +1,41 @@
+package saccharine
+
+type Node interface {
+	IsNode()
+}
+
+/** ------------------------------------------------------------------------- */
+
+type Abstraction struct {
+	Parameters []string
+	Body       Node
+}
+
+type Application struct {
+	Abstraction Node
+	Arguments   []Node
+}
+
+type Variable struct {
+	Name string
+}
+
+/** ------------------------------------------------------------------------- */
+
+func NewAbstraction(parameter []string, body Node) *Abstraction {
+	return &Abstraction{Parameters: parameter, Body: body}
+}
+
+func NewApplication(abstraction Node, arguments []Node) *Application {
+	return &Application{Abstraction: abstraction, Arguments: arguments}
+}
+
+func NewVariable(name string) *Variable {
+	return &Variable{Name: name}
+}
+
+/** ------------------------------------------------------------------------- */
+
+func (_ Abstraction) IsNode() {}
+func (_ Application) IsNode() {}
+func (_ Variable) IsNode()    {}