Sequence operations

ncw · ncw · commit 6cbdfef8baeb · 2013-11-23T10:21:04.000Z
diff --git a/py/list.go b/py/list.go
@@ -11,6 +11,15 @@ func (o List) Type() *Type {
 	return ListType
 }
 
+// Copy a list object
+func (l List) Copy() List {
+	newL := make(List, len(l))
+	for i := range l {
+		newL[i] = l[i]
+	}
+	return newL
+}
+
 func (t List) M__len__() Object {
 	return Int(len(t))
 }
diff --git a/py/sequence.go b/py/sequence.go
@@ -0,0 +1,27 @@
+// Sequence operations
+
+package py
+
+// Converts a sequence object v into a Tuple
+func SequenceTuple(v Object) Tuple {
+	// FIXME need to support iterable objects etc!
+	switch x := v.(type) {
+	case Tuple:
+		return x
+	case List:
+		return Tuple(x.Copy())
+	}
+	panic("SequenceTuple not fully implemented")
+}
+
+// Converts a sequence object v into a List
+func SequenceList(v Object) List {
+	// FIXME need to support iterable objects etc!
+	switch x := v.(type) {
+	case Tuple:
+		return List(x).Copy()
+	case List:
+		return x.Copy()
+	}
+	panic("SequenceList not fully implemented")
+}
