From b5234413611ce5984292f85a01de1f56c045b490 Mon Sep 17 00:00:00 2001
From: obscuren <geffobscura@gmail.com>
Date: Mon, 16 Mar 2015 11:27:38 +0100
Subject: Moved ethutil => common
---
common/list.go | 81 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 81 insertions(+)
create mode 100644 common/list.go
(limited to 'common/list.go')
diff --git a/common/list.go b/common/list.go
new file mode 100644
index 000000000..594a8a24b
--- /dev/null
+++ b/common/list.go
@@ -0,0 +1,81 @@
+package common
+
+import (
+ "encoding/json"
+ "reflect"
+ "sync"
+)
+
+// 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 {
+ mut sync.Mutex
+ val interface{}
+ 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{sync.Mutex{}, t, list, list.Len()}
+}
+
+func EmptyList() *List {
+ return NewList([]interface{}{})
+}
+
+// Get N element from the embedded slice. Returns nil if OOB.
+func (self *List) Get(i int) interface{} {
+ if self.list.Len() > i {
+ self.mut.Lock()
+ defer self.mut.Unlock()
+
+ i := self.list.Index(i).Interface()
+
+ return i
+ }
+
+ return nil
+}
+
+func (self *List) GetAsJson(i int) interface{} {
+ e := self.Get(i)
+
+ r, _ := json.Marshal(e)
+
+ return string(r)
+}
+
+// Appends value at the end of the slice. Panics when incompatible value
+// is given.
+func (self *List) Append(v interface{}) {
+ self.mut.Lock()
+ defer self.mut.Unlock()
+
+ 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()
+}
+
+// For JavaScript <3
+func (self *List) ToJSON() string {
+ // make(T, 0) != nil
+ list := make([]interface{}, 0)
+ for i := 0; i < self.Length; i++ {
+ list = append(list, self.Get(i))
+ }
+
+ data, _ := json.Marshal(list)
+
+ return string(data)
+}
--
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