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35 lines
1.1 KiB
Go
35 lines
1.1 KiB
Go
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// Copyright 2018 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 xerrors
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// A Formatter formats error messages.
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type Formatter interface {
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error
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// FormatError prints the receiver's first error and returns the next error in
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// the error chain, if any.
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FormatError(p Printer) (next error)
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}
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// A Printer formats error messages.
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//
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// The most common implementation of Printer is the one provided by package fmt
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// during Printf (as of Go 1.13). Localization packages such as golang.org/x/text/message
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// typically provide their own implementations.
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type Printer interface {
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// Print appends args to the message output.
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Print(args ...interface{})
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// Printf writes a formatted string.
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Printf(format string, args ...interface{})
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// Detail reports whether error detail is requested.
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// After the first call to Detail, all text written to the Printer
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// is formatted as additional detail, or ignored when
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// detail has not been requested.
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// If Detail returns false, the caller can avoid printing the detail at all.
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Detail() bool
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}
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