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76 lines
1.4 KiB
76 lines
1.4 KiB
package argh
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import (
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"fmt"
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"io"
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"sort"
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)
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// ScannerError is largely borrowed from go/scanner.Error
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type ScannerError struct {
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Pos Position
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Msg string
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}
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func (e ScannerError) Error() string {
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if e.Pos.IsValid() {
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return e.Pos.String() + ":" + e.Msg
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}
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return e.Msg
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}
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// ScannerErrorList is largely borrowed from go/scanner.ErrorList
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type ScannerErrorList []*ScannerError
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func (el *ScannerErrorList) Add(pos Position, msg string) {
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*el = append(*el, &ScannerError{Pos: pos, Msg: msg})
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}
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func (el *ScannerErrorList) Reset() { *el = (*el)[0:0] }
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func (el ScannerErrorList) Len() int { return len(el) }
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func (el ScannerErrorList) Swap(i, j int) { el[i], el[j] = el[j], el[i] }
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func (el ScannerErrorList) Less(i, j int) bool {
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e := &el[i].Pos
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f := &el[j].Pos
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if e.Column != f.Column {
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return e.Column < f.Column
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}
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return el[i].Msg < el[j].Msg
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}
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func (el ScannerErrorList) Sort() {
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sort.Sort(el)
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}
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func (el ScannerErrorList) Error() string {
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switch len(el) {
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case 0:
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return "no errors"
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case 1:
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return el[0].Error()
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}
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return fmt.Sprintf("%s (and %d more errors)", el[0], len(el)-1)
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}
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func (el ScannerErrorList) Err() error {
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if len(el) == 0 {
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return nil
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}
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return el
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}
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func PrintScannerError(w io.Writer, err error) {
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if list, ok := err.(ScannerErrorList); ok {
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for _, e := range list {
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fmt.Fprintf(w, "%s\n", e)
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}
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} else if err != nil {
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fmt.Fprintf(w, "%s\n", err)
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}
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}
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