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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.
// +build go1.13
package xerrors
import (
"errors"
"fmt"
"strconv"
)
// A Frame contains part of a call stack.
type Frame = errors.Frame
// Caller returns a Frame that describes a frame on the caller's stack.
// The argument skip is the number of frames to skip over.
// Caller(0) returns the frame for the caller of Caller.
var Caller func(skip int) Frame = errors.Caller
// FormatError calls the FormatError method of f with an errors.Printer
// configured according to s and verb, and writes the result to s.
func FormatError(f Formatter, s fmt.State, verb rune) {
// Assuming this function is only called from the Format method, and given
// that FormatError takes precedence over Format, it cannot be called from
// any package that supports errors.Formatter. It is therefore safe to
// disregard that State may be a specific printer implementation and use one
// of our choice instead.
width, okW := s.Width()
prec, okP := s.Precision()
// Construct format string from State s.
format := []byte{'%'}
if s.Flag('-') {
format = append(format, '-')
}
if s.Flag('+') {
format = append(format, '+')
}
if s.Flag(' ') {
format = append(format, ' ')
}
if okW {
format = strconv.AppendInt(format, int64(width), 10)
}
if okP {
format = append(format, '.')
format = strconv.AppendInt(format, int64(prec), 10)
}
format = append(format, string(verb)...)
fmt.Fprintf(s, string(format), f)
}
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