mirror of
https://github.com/go-gitea/gitea.git
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194 lines
4.0 KiB
Go
194 lines
4.0 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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import (
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"bytes"
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"fmt"
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"io"
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"reflect"
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"strconv"
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)
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// FormatError calls the FormatError method of f with an errors.Printer
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// configured according to s and verb, and writes the result to s.
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func FormatError(f Formatter, s fmt.State, verb rune) {
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// Assuming this function is only called from the Format method, and given
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// that FormatError takes precedence over Format, it cannot be called from
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// any package that supports errors.Formatter. It is therefore safe to
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// disregard that State may be a specific printer implementation and use one
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// of our choice instead.
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// limitations: does not support printing error as Go struct.
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var (
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sep = " " // separator before next error
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p = &state{State: s}
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direct = true
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)
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var err error = f
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switch verb {
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// Note that this switch must match the preference order
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// for ordinary string printing (%#v before %+v, and so on).
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case 'v':
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if s.Flag('#') {
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if stringer, ok := err.(fmt.GoStringer); ok {
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io.WriteString(&p.buf, stringer.GoString())
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goto exit
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}
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// proceed as if it were %v
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} else if s.Flag('+') {
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p.printDetail = true
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sep = "\n - "
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}
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case 's':
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case 'q', 'x', 'X':
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// Use an intermediate buffer in the rare cases that precision,
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// truncation, or one of the alternative verbs (q, x, and X) are
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// specified.
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direct = false
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default:
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p.buf.WriteString("%!")
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p.buf.WriteRune(verb)
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p.buf.WriteByte('(')
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switch {
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case err != nil:
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p.buf.WriteString(reflect.TypeOf(f).String())
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default:
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p.buf.WriteString("<nil>")
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}
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p.buf.WriteByte(')')
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io.Copy(s, &p.buf)
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return
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}
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loop:
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for {
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switch v := err.(type) {
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case Formatter:
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err = v.FormatError((*printer)(p))
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case fmt.Formatter:
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v.Format(p, 'v')
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break loop
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default:
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io.WriteString(&p.buf, v.Error())
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break loop
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}
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if err == nil {
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break
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}
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if p.needColon || !p.printDetail {
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p.buf.WriteByte(':')
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p.needColon = false
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}
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p.buf.WriteString(sep)
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p.inDetail = false
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p.needNewline = false
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}
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exit:
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width, okW := s.Width()
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prec, okP := s.Precision()
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if !direct || (okW && width > 0) || okP {
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// Construct format string from State s.
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format := []byte{'%'}
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if s.Flag('-') {
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format = append(format, '-')
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}
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if s.Flag('+') {
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format = append(format, '+')
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}
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if s.Flag(' ') {
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format = append(format, ' ')
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}
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if okW {
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format = strconv.AppendInt(format, int64(width), 10)
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}
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if okP {
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format = append(format, '.')
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format = strconv.AppendInt(format, int64(prec), 10)
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}
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format = append(format, string(verb)...)
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fmt.Fprintf(s, string(format), p.buf.String())
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} else {
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io.Copy(s, &p.buf)
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}
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}
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var detailSep = []byte("\n ")
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// state tracks error printing state. It implements fmt.State.
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type state struct {
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fmt.State
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buf bytes.Buffer
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printDetail bool
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inDetail bool
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needColon bool
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needNewline bool
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}
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func (s *state) Write(b []byte) (n int, err error) {
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if s.printDetail {
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if len(b) == 0 {
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return 0, nil
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}
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if s.inDetail && s.needColon {
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s.needNewline = true
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if b[0] == '\n' {
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b = b[1:]
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}
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}
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k := 0
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for i, c := range b {
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if s.needNewline {
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if s.inDetail && s.needColon {
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s.buf.WriteByte(':')
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s.needColon = false
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}
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s.buf.Write(detailSep)
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s.needNewline = false
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}
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if c == '\n' {
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s.buf.Write(b[k:i])
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k = i + 1
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s.needNewline = true
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}
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}
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s.buf.Write(b[k:])
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if !s.inDetail {
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s.needColon = true
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}
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} else if !s.inDetail {
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s.buf.Write(b)
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}
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return len(b), nil
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}
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// printer wraps a state to implement an xerrors.Printer.
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type printer state
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func (s *printer) Print(args ...interface{}) {
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if !s.inDetail || s.printDetail {
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fmt.Fprint((*state)(s), args...)
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}
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}
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func (s *printer) Printf(format string, args ...interface{}) {
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if !s.inDetail || s.printDetail {
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fmt.Fprintf((*state)(s), format, args...)
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}
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}
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func (s *printer) Detail() bool {
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s.inDetail = true
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return s.printDetail
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}
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