go/src/cmd/go/internal/vcs/discovery.go

// charsetReader returns a reader that converts from the given charset to UTF-8.
// Currently it only supports UTF-8 and ASCII. Otherwise, it returns a meaningful
// error which is printed by go get, so the user can find why the package
// wasn't downloaded if the encoding is not supported. Note that, in
// order to reduce potential errors, ASCII is treated as UTF-8 (i.e. characters
// greater than 0x7f are not rejected).
func charsetReader(charset string, input io.Reader) (io.Reader, error) {}

// parseMetaGoImports returns meta imports from the HTML in r.
// Parsing ends at the end of the <head> section or the beginning of the <body>.
func parseMetaGoImports(r io.Reader, mod ModuleMode) ([]metaImport, error) {}

// attrValue returns the attribute value for the case-insensitive key
// `name`, or the empty string if nothing is found.
func attrValue(attrs []xml.Attr, name string) string {}