66 lines
1.4 KiB
Go
66 lines
1.4 KiB
Go
|
// 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)
|
||
|
|
}
|