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// Copyright (C) MongoDB, Inc. 2017-present.
//
// 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
package bsoncodec
import "fmt"
type mode int
const (
_ mode = iota
mTopLevel
mDocument
mArray
mValue
mElement
mCodeWithScope
mSpacer
)
func (m mode) String() string {
var str string
switch m {
case mTopLevel:
str = "TopLevel"
case mDocument:
str = "DocumentMode"
case mArray:
str = "ArrayMode"
case mValue:
str = "ValueMode"
case mElement:
str = "ElementMode"
case mCodeWithScope:
str = "CodeWithScopeMode"
case mSpacer:
str = "CodeWithScopeSpacerFrame"
default:
str = "UnknownMode"
}
return str
}
// TransitionError is an error returned when an invalid progressing a
// ValueReader or ValueWriter state machine occurs.
type TransitionError struct {
parent mode
current mode
destination mode
}
func (te TransitionError) Error() string {
if te.destination == mode(0) {
return fmt.Sprintf("invalid state transition: cannot read/write value while in %s", te.current)
}
if te.parent == mode(0) {
return fmt.Sprintf("invalid state transition: %s -> %s", te.current, te.destination)
}
return fmt.Sprintf("invalid state transition: %s -> %s; parent %s", te.current, te.destination, te.parent)
}