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authorobscuren <geffobscura@gmail.com>2015-03-16 18:27:38 +0800
committerobscuren <geffobscura@gmail.com>2015-03-16 18:27:38 +0800
commitb5234413611ce5984292f85a01de1f56c045b490 (patch)
treee6e0c6f7fe8358a2dc63cdea11ac66b4f59397f5 /common/value.go
parent0b8f66ed9ef177dc72442dd7ba337c6733e30344 (diff)
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Moved ethutil => common
Diffstat (limited to 'common/value.go')
-rw-r--r--common/value.go401
1 files changed, 401 insertions, 0 deletions
diff --git a/common/value.go b/common/value.go
new file mode 100644
index 000000000..72a123772
--- /dev/null
+++ b/common/value.go
@@ -0,0 +1,401 @@
+package common
+
+import (
+ "bytes"
+ "fmt"
+ "math/big"
+ "reflect"
+ "strconv"
+)
+
+// Data values are returned by the rlp decoder. The data values represents
+// one item within the rlp data structure. It's responsible for all the casting
+// It always returns something valid
+type Value struct {
+ Val interface{}
+ kind reflect.Value
+}
+
+func (val *Value) String() string {
+ return fmt.Sprintf("%x", val.Val)
+}
+
+func NewValue(val interface{}) *Value {
+ t := val
+ if v, ok := val.(*Value); ok {
+ t = v.Val
+ }
+
+ return &Value{Val: t}
+}
+
+func (val *Value) Type() reflect.Kind {
+ return reflect.TypeOf(val.Val).Kind()
+}
+
+func (val *Value) IsNil() bool {
+ return val.Val == nil
+}
+
+func (val *Value) Len() int {
+ //return val.kind.Len()
+ if data, ok := val.Val.([]interface{}); ok {
+ return len(data)
+ }
+
+ return len(val.Bytes())
+}
+
+func (val *Value) Raw() interface{} {
+ return val.Val
+}
+
+func (val *Value) Interface() interface{} {
+ return val.Val
+}
+
+func (val *Value) Uint() uint64 {
+ if Val, ok := val.Val.(uint8); ok {
+ return uint64(Val)
+ } else if Val, ok := val.Val.(uint16); ok {
+ return uint64(Val)
+ } else if Val, ok := val.Val.(uint32); ok {
+ return uint64(Val)
+ } else if Val, ok := val.Val.(uint64); ok {
+ return Val
+ } else if Val, ok := val.Val.(float32); ok {
+ return uint64(Val)
+ } else if Val, ok := val.Val.(float64); ok {
+ return uint64(Val)
+ } else if Val, ok := val.Val.(int); ok {
+ return uint64(Val)
+ } else if Val, ok := val.Val.(uint); ok {
+ return uint64(Val)
+ } else if Val, ok := val.Val.([]byte); ok {
+ return new(big.Int).SetBytes(Val).Uint64()
+ } else if Val, ok := val.Val.(*big.Int); ok {
+ return Val.Uint64()
+ }
+
+ return 0
+}
+
+func (val *Value) Int() int64 {
+ if Val, ok := val.Val.(int8); ok {
+ return int64(Val)
+ } else if Val, ok := val.Val.(int16); ok {
+ return int64(Val)
+ } else if Val, ok := val.Val.(int32); ok {
+ return int64(Val)
+ } else if Val, ok := val.Val.(int64); ok {
+ return Val
+ } else if Val, ok := val.Val.(int); ok {
+ return int64(Val)
+ } else if Val, ok := val.Val.(float32); ok {
+ return int64(Val)
+ } else if Val, ok := val.Val.(float64); ok {
+ return int64(Val)
+ } else if Val, ok := val.Val.([]byte); ok {
+ return new(big.Int).SetBytes(Val).Int64()
+ } else if Val, ok := val.Val.(*big.Int); ok {
+ return Val.Int64()
+ } else if Val, ok := val.Val.(string); ok {
+ n, _ := strconv.Atoi(Val)
+ return int64(n)
+ }
+
+ return 0
+}
+
+func (val *Value) Byte() byte {
+ if Val, ok := val.Val.(byte); ok {
+ return Val
+ }
+
+ return 0x0
+}
+
+func (val *Value) BigInt() *big.Int {
+ if a, ok := val.Val.([]byte); ok {
+ b := new(big.Int).SetBytes(a)
+
+ return b
+ } else if a, ok := val.Val.(*big.Int); ok {
+ return a
+ } else if a, ok := val.Val.(string); ok {
+ return Big(a)
+ } else {
+ return big.NewInt(int64(val.Uint()))
+ }
+
+ return big.NewInt(0)
+}
+
+func (val *Value) Str() string {
+ if a, ok := val.Val.([]byte); ok {
+ return string(a)
+ } else if a, ok := val.Val.(string); ok {
+ return a
+ } else if a, ok := val.Val.(byte); ok {
+ return string(a)
+ }
+
+ return ""
+}
+
+func (val *Value) Bytes() []byte {
+ if a, ok := val.Val.([]byte); ok {
+ return a
+ } else if s, ok := val.Val.(byte); ok {
+ return []byte{s}
+ } else if s, ok := val.Val.(string); ok {
+ return []byte(s)
+ } else if s, ok := val.Val.(*big.Int); ok {
+ return s.Bytes()
+ } else {
+ return big.NewInt(val.Int()).Bytes()
+ }
+
+ return []byte{}
+}
+
+func (val *Value) Err() error {
+ if err, ok := val.Val.(error); ok {
+ return err
+ }
+
+ return nil
+}
+
+func (val *Value) Slice() []interface{} {
+ if d, ok := val.Val.([]interface{}); ok {
+ return d
+ }
+
+ return []interface{}{}
+}
+
+func (val *Value) SliceFrom(from int) *Value {
+ slice := val.Slice()
+
+ return NewValue(slice[from:])
+}
+
+func (val *Value) SliceTo(to int) *Value {
+ slice := val.Slice()
+
+ return NewValue(slice[:to])
+}
+
+func (val *Value) SliceFromTo(from, to int) *Value {
+ slice := val.Slice()
+
+ return NewValue(slice[from:to])
+}
+
+// TODO More type checking methods
+func (val *Value) IsSlice() bool {
+ return val.Type() == reflect.Slice
+}
+
+func (val *Value) IsStr() bool {
+ return val.Type() == reflect.String
+}
+
+func (self *Value) IsErr() bool {
+ _, ok := self.Val.(error)
+ return ok
+}
+
+// Special list checking function. Something is considered
+// a list if it's of type []interface{}. The list is usually
+// used in conjunction with rlp decoded streams.
+func (val *Value) IsList() bool {
+ _, ok := val.Val.([]interface{})
+
+ return ok
+}
+
+func (val *Value) IsEmpty() bool {
+ return val.Val == nil || ((val.IsSlice() || val.IsStr()) && val.Len() == 0)
+}
+
+// Threat the value as a slice
+func (val *Value) Get(idx int) *Value {
+ if d, ok := val.Val.([]interface{}); ok {
+ // Guard for oob
+ if len(d) <= idx {
+ return NewValue(nil)
+ }
+
+ if idx < 0 {
+ return NewValue(nil)
+ }
+
+ return NewValue(d[idx])
+ }
+
+ // If this wasn't a slice you probably shouldn't be using this function
+ return NewValue(nil)
+}
+
+func (self *Value) Copy() *Value {
+ switch val := self.Val.(type) {
+ case *big.Int:
+ return NewValue(new(big.Int).Set(val))
+ case []byte:
+ return NewValue(CopyBytes(val))
+ default:
+ return NewValue(self.Val)
+ }
+
+ return nil
+}
+
+func (val *Value) Cmp(o *Value) bool {
+ return reflect.DeepEqual(val.Val, o.Val)
+}
+
+func (self *Value) DeepCmp(o *Value) bool {
+ return bytes.Compare(self.Bytes(), o.Bytes()) == 0
+}
+
+func (val *Value) Encode() []byte {
+ return Encode(val.Val)
+}
+
+// Assume that the data we have is encoded
+func (self *Value) Decode() {
+ v, _ := Decode(self.Bytes(), 0)
+ self.Val = v
+ //self.Val = DecodeWithReader(bytes.NewBuffer(self.Bytes()))
+}
+
+func NewValueFromBytes(data []byte) *Value {
+ if len(data) != 0 {
+ value := NewValue(data)
+ value.Decode()
+
+ return value
+ }
+
+ return NewValue(nil)
+}
+
+// Value setters
+func NewSliceValue(s interface{}) *Value {
+ list := EmptyValue()
+
+ if s != nil {
+ if slice, ok := s.([]interface{}); ok {
+ for _, val := range slice {
+ list.Append(val)
+ }
+ } else if slice, ok := s.([]string); ok {
+ for _, val := range slice {
+ list.Append(val)
+ }
+ }
+ }
+
+ return list
+}
+
+func EmptyValue() *Value {
+ return NewValue([]interface{}{})
+}
+
+func (val *Value) AppendList() *Value {
+ list := EmptyValue()
+ val.Val = append(val.Slice(), list)
+
+ return list
+}
+
+func (val *Value) Append(v interface{}) *Value {
+ val.Val = append(val.Slice(), v)
+
+ return val
+}
+
+const (
+ valOpAdd = iota
+ valOpDiv
+ valOpMul
+ valOpPow
+ valOpSub
+)
+
+// Math stuff
+func (self *Value) doOp(op int, other interface{}) *Value {
+ left := self.BigInt()
+ right := NewValue(other).BigInt()
+
+ switch op {
+ case valOpAdd:
+ self.Val = left.Add(left, right)
+ case valOpDiv:
+ self.Val = left.Div(left, right)
+ case valOpMul:
+ self.Val = left.Mul(left, right)
+ case valOpPow:
+ self.Val = left.Exp(left, right, Big0)
+ case valOpSub:
+ self.Val = left.Sub(left, right)
+ }
+
+ return self
+}
+
+func (self *Value) Add(other interface{}) *Value {
+ return self.doOp(valOpAdd, other)
+}
+
+func (self *Value) Sub(other interface{}) *Value {
+ return self.doOp(valOpSub, other)
+}
+
+func (self *Value) Div(other interface{}) *Value {
+ return self.doOp(valOpDiv, other)
+}
+
+func (self *Value) Mul(other interface{}) *Value {
+ return self.doOp(valOpMul, other)
+}
+
+func (self *Value) Pow(other interface{}) *Value {
+ return self.doOp(valOpPow, other)
+}
+
+type ValueIterator struct {
+ value *Value
+ currentValue *Value
+ idx int
+}
+
+func (val *Value) NewIterator() *ValueIterator {
+ return &ValueIterator{value: val}
+}
+
+func (it *ValueIterator) Len() int {
+ return it.value.Len()
+}
+
+func (it *ValueIterator) Next() bool {
+ if it.idx >= it.value.Len() {
+ return false
+ }
+
+ it.currentValue = it.value.Get(it.idx)
+ it.idx++
+
+ return true
+}
+
+func (it *ValueIterator) Value() *Value {
+ return it.currentValue
+}
+
+func (it *ValueIterator) Idx() int {
+ return it.idx - 1
+}