Method mustPeek

xmlparser/decoder.go:828–836

mustPeek peeks at the next n bytes without advancing the reader. If an error occurs, it sets d.err and returns false. If io.EOF is encountered, it sets d.err to a more descriptive error.

(n int)

// If an error occurs, it sets d.err and returns false.
// If io.EOF is encountered, it sets d.err to a more descriptive error.
func (d *Decoder) mustPeek(n int) ([]byte, bool) {
	b, ok := d.peek(n)
	if !ok {
		if errors.Is(d.err, io.EOF) {
			d.setSyntaxErrorf("unexpected EOF")
		}
	}
	return b, ok
}

// mustPeekBuffered peeks at all currently buffered bytes without advancing the reader.
// If no bytes are buffered, it peeks at least 1 byte.