mirror of
https://github.com/42wim/matterbridge.git
synced 2024-11-22 02:32:02 -08:00
122 lines
2.8 KiB
Go
122 lines
2.8 KiB
Go
// Copyright 2009 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 scanner
|
|
|
|
import (
|
|
"fmt"
|
|
"io"
|
|
"sort"
|
|
)
|
|
|
|
import (
|
|
"gopkg.in/gcfg.v1/token"
|
|
)
|
|
|
|
// In an ErrorList, an error is represented by an *Error.
|
|
// The position Pos, if valid, points to the beginning of
|
|
// the offending token, and the error condition is described
|
|
// by Msg.
|
|
//
|
|
type Error struct {
|
|
Pos token.Position
|
|
Msg string
|
|
}
|
|
|
|
// Error implements the error interface.
|
|
func (e Error) Error() string {
|
|
if e.Pos.Filename != "" || e.Pos.IsValid() {
|
|
// don't print "<unknown position>"
|
|
// TODO(gri) reconsider the semantics of Position.IsValid
|
|
return e.Pos.String() + ": " + e.Msg
|
|
}
|
|
return e.Msg
|
|
}
|
|
|
|
// ErrorList is a list of *Errors.
|
|
// The zero value for an ErrorList is an empty ErrorList ready to use.
|
|
//
|
|
type ErrorList []*Error
|
|
|
|
// Add adds an Error with given position and error message to an ErrorList.
|
|
func (p *ErrorList) Add(pos token.Position, msg string) {
|
|
*p = append(*p, &Error{pos, msg})
|
|
}
|
|
|
|
// Reset resets an ErrorList to no errors.
|
|
func (p *ErrorList) Reset() { *p = (*p)[0:0] }
|
|
|
|
// ErrorList implements the sort Interface.
|
|
func (p ErrorList) Len() int { return len(p) }
|
|
func (p ErrorList) Swap(i, j int) { p[i], p[j] = p[j], p[i] }
|
|
|
|
func (p ErrorList) Less(i, j int) bool {
|
|
e := &p[i].Pos
|
|
f := &p[j].Pos
|
|
if e.Filename < f.Filename {
|
|
return true
|
|
}
|
|
if e.Filename == f.Filename {
|
|
return e.Offset < f.Offset
|
|
}
|
|
return false
|
|
}
|
|
|
|
// Sort sorts an ErrorList. *Error entries are sorted by position,
|
|
// other errors are sorted by error message, and before any *Error
|
|
// entry.
|
|
//
|
|
func (p ErrorList) Sort() {
|
|
sort.Sort(p)
|
|
}
|
|
|
|
// RemoveMultiples sorts an ErrorList and removes all but the first error per line.
|
|
func (p *ErrorList) RemoveMultiples() {
|
|
sort.Sort(p)
|
|
var last token.Position // initial last.Line is != any legal error line
|
|
i := 0
|
|
for _, e := range *p {
|
|
if e.Pos.Filename != last.Filename || e.Pos.Line != last.Line {
|
|
last = e.Pos
|
|
(*p)[i] = e
|
|
i++
|
|
}
|
|
}
|
|
(*p) = (*p)[0:i]
|
|
}
|
|
|
|
// An ErrorList implements the error interface.
|
|
func (p ErrorList) Error() string {
|
|
switch len(p) {
|
|
case 0:
|
|
return "no errors"
|
|
case 1:
|
|
return p[0].Error()
|
|
}
|
|
return fmt.Sprintf("%s (and %d more errors)", p[0], len(p)-1)
|
|
}
|
|
|
|
// Err returns an error equivalent to this error list.
|
|
// If the list is empty, Err returns nil.
|
|
func (p ErrorList) Err() error {
|
|
if len(p) == 0 {
|
|
return nil
|
|
}
|
|
return p
|
|
}
|
|
|
|
// PrintError is a utility function that prints a list of errors to w,
|
|
// one error per line, if the err parameter is an ErrorList. Otherwise
|
|
// it prints the err string.
|
|
//
|
|
func PrintError(w io.Writer, err error) {
|
|
if list, ok := err.(ErrorList); ok {
|
|
for _, e := range list {
|
|
fmt.Fprintf(w, "%s\n", e)
|
|
}
|
|
} else if err != nil {
|
|
fmt.Fprintf(w, "%s\n", err)
|
|
}
|
|
}
|