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authorobscuren <geffobscura@gmail.com>2014-09-07 16:18:54 +0800
committerobscuren <geffobscura@gmail.com>2014-09-07 16:18:54 +0800
commitff27df78fc5d638b562bae9b4515eb5f5735d45d (patch)
tree643416ffed96531211dc376be6403df9baddc519
parent627b7c9fd75c84e0ca3af110b8f64ab5bbda963e (diff)
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Added new list type which can embed any slice type
-rw-r--r--ethutil/list.go42
1 files changed, 42 insertions, 0 deletions
diff --git a/ethutil/list.go b/ethutil/list.go
new file mode 100644
index 000000000..18bf04792
--- /dev/null
+++ b/ethutil/list.go
@@ -0,0 +1,42 @@
+package ethutil
+
+import "reflect"
+
+// The list type is an anonymous slice handler which can be used
+// for containing any slice type to use in an environment which
+// does not support slice types (e.g., JavaScript, QML)
+type List struct {
+ list reflect.Value
+ Length int
+}
+
+// Initialise a new list. Panics if non-slice type is given.
+func NewList(t interface{}) *List {
+ list := reflect.ValueOf(t)
+ if list.Kind() != reflect.Slice {
+ panic("list container initialized with a non-slice type")
+ }
+
+ return &List{list, list.Len()}
+}
+
+// Get N element from the embedded slice. Returns nil if OOB.
+func (self *List) Get(i int) interface{} {
+ if self.list.Len() > i {
+ return self.list.Index(i).Interface()
+ }
+
+ return nil
+}
+
+// Appends value at the end of the slice. Panics when incompatible value
+// is given.
+func (self *List) Append(v interface{}) {
+ self.list = reflect.Append(self.list, reflect.ValueOf(v))
+ self.Length = self.list.Len()
+}
+
+// Returns the underlying slice as interface.
+func (self *List) Interface() interface{} {
+ return self.list.Interface()
+}