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transfer.go
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transfer.go
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/*
* Cadence - The resource-oriented smart contract programming language
*
* Copyright Dapper Labs, Inc.
*
* 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 ast
import (
"encoding/json"
"github.com/turbolent/prettier"
"github.com/onflow/cadence/runtime/common"
)
// Transfer represents the operation in variable declarations
// and assignments
type Transfer struct {
Operation TransferOperation
Pos Position `json:"-"`
}
func NewTransfer(memoryGauge common.MemoryGauge, operation TransferOperation, position Position) *Transfer {
common.UseMemory(memoryGauge, common.TransferMemoryUsage)
return &Transfer{
Operation: operation,
Pos: position,
}
}
func (f Transfer) StartPosition() Position {
return f.Pos
}
func (f Transfer) EndPosition(memoryGauge common.MemoryGauge) Position {
length := len(f.Operation.Operator())
return f.Pos.Shifted(memoryGauge, length-1)
}
func (f Transfer) MarshalJSON() ([]byte, error) {
type Alias Transfer
return json.Marshal(&struct {
*Alias
Type string
Range
}{
Type: "Transfer",
Range: NewUnmeteredRangeFromPositioned(f),
Alias: (*Alias)(&f),
})
}
var copyTransferDoc prettier.Doc = prettier.Text("=")
var moveTransferDoc prettier.Doc = prettier.Text("<-")
var forceMoveTransferDoc prettier.Doc = prettier.Text("<-!")
func (f Transfer) Doc() prettier.Doc {
switch f.Operation {
case TransferOperationMove:
return moveTransferDoc
case TransferOperationMoveForced:
return forceMoveTransferDoc
default:
return copyTransferDoc
}
}