mirror of
https://github.com/protocolbuffers/protobuf-go.git
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41 lines
1.1 KiB
Go
41 lines
1.1 KiB
Go
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// Copyright 2019 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package fieldsort defines an ordering of fields.
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//
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// The ordering defined by this package matches the historic behavior of the proto
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// package, placing extensions first and oneofs last.
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//
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// There is no guarantee about stability of the wire encoding, and users should not
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// depend on the order defined in this package as it is subject to change without
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// notice.
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package fieldsort
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import (
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"google.golang.org/protobuf/reflect/protoreflect"
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)
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// Less returns true if field a comes before field j in ordered wire marshal output.
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func Less(a, b protoreflect.FieldDescriptor) bool {
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ea := a.IsExtension()
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eb := b.IsExtension()
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oa := a.ContainingOneof()
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ob := b.ContainingOneof()
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switch {
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case ea != eb:
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return ea
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case oa != nil && ob != nil:
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if oa == ob {
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return a.Number() < b.Number()
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}
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return oa.Index() < ob.Index()
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case oa != nil:
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return false
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case ob != nil:
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return true
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default:
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return a.Number() < b.Number()
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}
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}
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