more built-ins for code creation

forge/builtins/builtins.go

@@ -9,7 +9,7 @@ type XT = forge.XT
 type FPtr = forge.FPtr
 
 type builtins struct {
-	Add, Body, Create, Dup, Get, Lit, Mult, Put, Reg, Var XT
+	Add, Body, Comp, Create, Dup, Get, Lit, Mult, New1, Put, Reg, Swap, Var XT
 }
 
 func Get(f FE) *builtins {
@@ -30,9 +30,14 @@ func setup(f FE) *builtins {
 		Add: r("+", func(f FE, _ XT) {
 			f.Push(f.Pop().(int) + f.Pop().(int))
 		}),
+		/*Append:  r("append", func(f FE, _ XT) {
+			item := f.Pop()
+			f.Peek(0).(FPtr).Append(item)
+		}),*/
 		Body: r("body", func(f FE, _ XT) {
 			f.Push(f.Pop().(XT).Code().New().Next())
 		}),
+		Comp:   r("comp", func(f FE, _ XT) { f.LatestXT().Code().Append(f.Pop()) }),
 		Create: r("create", create),
 		Dup:    r("dup", func(f FE, _ XT) { f.Push(f.Peek(0)) }),
 		Get:    r("@", func(f FE, _ XT) { f.Push(f.Pop().(FPtr).Value()) }),
@@ -40,19 +45,26 @@ func setup(f FE) *builtins {
 		Mult: r("*", func(f FE, _ XT) {
 			f.Push(f.Pop().(int) * f.Pop().(int))
 		}),
-		Put: r("!", func(f FE, _ XT) { f.Pop().(FPtr).Set(f.Pop()) }),
-		Reg: r("reg", func(f FE, _ XT) { reg(f) }),
+		New1: r("new1", func(f FE, _ XT) { f.Push(f.NewVar()) }),
+		Put:  r("!", func(f FE, _ XT) { f.Pop().(FPtr).Set(f.Pop()) }),
+		Reg:  r("reg", func(f FE, _ XT) { reg(f) }),
+		Swap: r("swap", func(f FE, _ XT) {
+			a := f.Pop()
+			b := f.Pop()
+			f.Push(a)
+			f.Push(b)
+		}),
 		Var: r("var", func(f FE, _ XT) {
 			f.Register(forge.FCode(f.Pop().(string), f.Code(f.NewVar())))
 		}),
 	}
 	// b.Var1 = forge.Register(voc, forge.FCode("var1",
-	//f.Code(f.Code(b.New1), b.Swap, b.Reg)))
+	//f.Code(b.Code, b.Swap, b.Reg, b.New1, b.Comp)))
 	return &b
 }
 
 func reg(f FE) {
-	f.Register(forge.FCode(f.Pop().(string), f.Pop().(FPtr)))
+	f.Register(forge.FCode(f.Pop().(string), f.Pop().(FPtr).Reset()))
 }
 
 func create(f FE, _ XT) {

forge/forge.go

@@ -76,8 +76,6 @@ func (f *forgeEnv) Exec(items ...fitem) *forgeEnv {
 	return f.Call(f.Code(items...))
 }
 
-// core methods
-
 func (f *forgeEnv) NewVar() fptr {
 	return newScalar()
 }

forge/xt.go

@@ -36,7 +36,7 @@ func (it *gofunc) Name() string {
 	return string(it.name)
 }
 
-// acode (anonymous code), fcode: forge code
+// acode: anonymous forge code
 
 type acode struct {
 	code fptr
@@ -58,6 +58,8 @@ func (it *acode) Name() string {
 	return ""
 }
 
+// fcode: named (and usually registered) forge code
+
 type fcode struct {
 	acode
 	name string