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uint.go
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/
uint.go
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// Copyright 2018 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package types
import (
"fmt"
"github.com/golang/protobuf/ptypes/struct"
"github.com/google/cel-go/common/types/ref"
"github.com/google/cel-go/common/types/traits"
"reflect"
)
// Uint type implementation which supports comparison and math operators.
type Uint uint64
var (
// UintType singleton.
UintType = NewTypeValue("uint",
traits.AdderType,
traits.ComparerType,
traits.DividerType,
traits.ModderType,
traits.MultiplierType,
traits.SubtractorType)
)
const (
uintZero = Uint(0)
)
func (i Uint) Add(other ref.Value) ref.Value {
if UintType != other.Type() {
return NewErr("unsupported overload")
}
return i + other.(Uint)
}
func (i Uint) Compare(other ref.Value) ref.Value {
if UintType != other.Type() {
return NewErr("unsupported overload")
}
if i < other.(Uint) {
return IntNegOne
}
if i > other.(Uint) {
return IntOne
}
return IntZero
}
func (i Uint) ConvertToNative(typeDesc reflect.Type) (interface{}, error) {
value := i.Value()
switch typeDesc.Kind() {
case reflect.Uint32:
return uint32(value.(uint64)), nil
case reflect.Uint64:
return value, nil
case reflect.Ptr:
if typeDesc == jsonValueType {
return &structpb.Value{
Kind: &structpb.Value_NumberValue{
NumberValue: float64(i)}}, nil
}
switch typeDesc.Elem().Kind() {
case reflect.Uint32:
p := uint32(i)
return &p, nil
case reflect.Uint64:
p := uint64(i)
return &p, nil
}
case reflect.Interface:
if reflect.TypeOf(i).Implements(typeDesc) {
return i, nil
}
}
return nil, fmt.Errorf("unsupported type conversion from 'uint' to %v", typeDesc)
}
func (i Uint) ConvertToType(typeVal ref.Type) ref.Value {
switch typeVal {
case IntType:
return Int(i)
case UintType:
return i
case DoubleType:
return Double(i)
case StringType:
return String(fmt.Sprintf("%d", uint64(i)))
case TypeType:
return UintType
}
return NewErr("type conversion error from '%s' to '%s'", UintType, typeVal)
}
func (i Uint) Divide(other ref.Value) ref.Value {
if UintType != other.Type() {
return NewErr("unsupported overload")
}
otherUint := other.(Uint)
if otherUint == uintZero {
return NewErr("divide by zero")
}
return i / otherUint
}
func (i Uint) Equal(other ref.Value) ref.Value {
return Bool(UintType == other.Type() &&
i.Value() == other.Value())
}
func (i Uint) Modulo(other ref.Value) ref.Value {
if UintType != other.Type() {
return NewErr("unsupported overload")
}
otherUint := other.(Uint)
if otherUint == uintZero {
return NewErr("modulus by zero")
}
return i % otherUint
}
func (i Uint) Multiply(other ref.Value) ref.Value {
if UintType != other.Type() {
return NewErr("unsupported overload")
}
return i * other.(Uint)
}
func (i Uint) Subtract(subtrahend ref.Value) ref.Value {
if UintType != subtrahend.Type() {
return NewErr("unsupported overload")
}
return i - subtrahend.(Uint)
}
func (i Uint) Type() ref.Type {
return UintType
}
func (i Uint) Value() interface{} {
return uint64(i)
}