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internal/flags: add package to control specialized functionality

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Package flags defines a set of constants to control support for certain features.

Other flags that may be added in the future may include:
	PureGo: to control whether protobuf code should avoid using the unsafe
		package and only use Go reflection.
	PureProto: to control whether the proto package ignores the protoiface
		package and only uses protobuf reflection. This is useful for testing.
	Proto2ValidateUTF8: whether to validate UTF-8 in proto2 strings.
	Proto3ValidateUTF8: whether to validate UTF-8 in proto3 strings.

Change-Id: Ibcb8dd8b3e977633b8a4e4a22a0617f2eebcc325
Reviewed-on: https://go-review.googlesource.com/127820
Reviewed-by: Damien Neil <dneil@google.com>
This commit is contained in:
Joe Tsai 2018-08-03 15:53:13 -07:00 committed by Joe Tsai
parent be60f99ca7
commit 025d81dac6
3 changed files with 34 additions and 0 deletions
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internal/flags/flags.go Normal file
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// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package flags provides a set of flags controlled by build tags.
package flags
// Proto1Legacy specifies whether to enable support for legacy proto1
// functionality such as MessageSets, weak fields, and various other obscure
// behavior that is necessary to maintain backwards compatibility with proto1.
//
// This is disabled by default unless built with the "proto1_legacy" tag.
//
// WARNING: The compatibility agreement covers nothing provided by this flag.
// As such, functionality may suddenly be removed or changed at our discretion.
const Proto1Legacy = proto1Legacy

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internal/flags/proto1_legacy_disable.go Normal file
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// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE.md file.
// +build !proto1_legacy
package flags
const proto1Legacy = false

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internal/flags/proto1_legacy_enable.go Normal file
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// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE.md file.
// +build proto1_legacy
package flags
const proto1Legacy = true