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walk.go
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walk.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 interpreter
type ValueWalker interface {
WalkValue(interpreter *Interpreter, value Value) ValueWalker
}
// WalkValue traverses a Value object graph in depth-first order:
// It starts by calling valueWalker.WalkValue(value);
// If the returned walker is nil,
// child values are not walked.
// If the returned walker is not-nil,
// then WalkValue is invoked recursively on this returned walker
// for each of the non-nil children of the value,
// followed by a call of WalkValue(nil) on the returned walker.
//
// The initial walker may not be nil.
func WalkValue(interpreter *Interpreter, walker ValueWalker, value Value) {
if walker = walker.WalkValue(interpreter, value); walker == nil {
return
}
value.Walk(interpreter, func(child Value) {
WalkValue(interpreter, walker, child)
})
walker.WalkValue(interpreter, nil)
}