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// Copyright 2011 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 errors implements functions to manipulate errors.
package errors
import (
"internal/errinternal"
"runtime"
)
// New returns an error that formats as the given text.
//
// The returned error contains a Frame set to the caller's location and
// implements Formatter to show this information when printed with details.
func New(text string) error {
// Inline call to errors.Callers to improve performance.
var s Frame
runtime.Callers(2, s.frames[:])
return &errorString{text, nil, s}
}
func init() {
errinternal.NewError = func(text string, err error) error {
var s Frame
runtime.Callers(3, s.frames[:])
return &errorString{text, err, s}
}
}
// errorString is a trivial implementation of error.
type errorString struct {
s string
err error
frame Frame
}
func (e *errorString) Error() string {
if e.err != nil {
return e.s + ": " + e.err.Error()
}
return e.s
}
func (e *errorString) FormatError(p Printer) (next error) {
p.Print(e.s)
e.frame.Format(p)
return e.err
}
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