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author | Felix Lange <fjl@twurst.com> | 2014-10-23 21:01:27 +0800 |
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committer | Felix Lange <fjl@twurst.com> | 2014-10-23 21:01:27 +0800 |
commit | 69baa465ea69ae60eed802445cf0132b9eb69934 (patch) | |
tree | b09da7582b5c4850d4db13aee808f2fef2f97de0 /ethutil/list.go | |
parent | 50fd46924900869e7210217c6a07979b544991c8 (diff) | |
parent | feef194829b07570e91873ed5d1e8cc51e8fa430 (diff) | |
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Merge eth-go repository into go-ethereum
mist, etheruem have been moved to cmd/
Diffstat (limited to 'ethutil/list.go')
-rw-r--r-- | ethutil/list.go | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/ethutil/list.go b/ethutil/list.go new file mode 100644 index 000000000..6919a02f5 --- /dev/null +++ b/ethutil/list.go @@ -0,0 +1,80 @@ +package ethutil + +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 { + var list []interface{} + for i := 0; i < self.Length; i++ { + list = append(list, self.Get(i)) + } + + data, _ := json.Marshal(list) + + return string(data) +} |