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encoding/xml: wrap charsetReader errors

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This change wraps the errors from the CharsetReader function so the
caller can distinguish different error conditions.

Context: I have an XML file with an unknown encoding which I like to
handle separately. I like to use the CharsetReader for this but the
error type has not been forwarded.
This commit is contained in:
Thuy Linh Luu 2023-05-12 15:51:17 +02:00
parent 6d2309b576
commit ada9dd510f
1 changed files with 4 additions and 1 deletions
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5
src/encoding/xml/xml.go
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@ -262,6 +262,9 @@ func NewTokenDecoder(t TokenReader) *Decoder {
// or EOF before all expected end elements,
// it will return an error.
//
// If CharsetReader is called and returns an error,
// the error is wrapped and returned.
//
// Token implements XML name spaces as described by
// https://www.w3.org/TR/REC-xml-names/. Each of the
// Name structures contained in the Token has the Space
@ -634,7 +637,7 @@ func (d *Decoder) rawToken() (Token, error) {
}
newr, err := d.CharsetReader(enc, d.r.(io.Reader))
if err != nil {
d.err = fmt.Errorf("xml: opening charset %q: %v", enc, err)
d.err = fmt.Errorf("xml: opening charset %q: %w", enc, err)
return nil, d.err
}
if newr == nil {