65 lines
2.3 KiB
Go
65 lines
2.3 KiB
Go
|
// Copyright 2015 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 ianaindex maps names to Encodings as specified by the IANA registry.
|
||
|
|
// This includes both the MIME and IANA names.
|
||
|
|
//
|
||
|
|
// See http://www.iana.org/assignments/character-sets/character-sets.xhtml for
|
||
|
|
// more details.
|
||
|
|
package ianaindex
|
||
|
|
|
||
|
|
import (
|
||
|
|
"golang.org/x/text/encoding"
|
||
|
|
)
|
||
|
|
|
||
|
|
// TODO: allow users to specify their own aliases?
|
||
|
|
// TODO: allow users to specify their own indexes?
|
||
|
|
// TODO: allow canonicalizing names
|
||
|
|
|
||
|
|
// NOTE: only use these top-level variables if we can get the linker to drop
|
||
|
|
// the indexes when they are not used. Make them a function or perhaps only
|
||
|
|
// support MIME otherwise.
|
||
|
|
|
||
|
|
var (
|
||
|
|
// MIME is an index to map MIME names. It does not support aliases.
|
||
|
|
MIME *Index
|
||
|
|
|
||
|
|
// IANA is an index that supports all names and aliases using IANA names as
|
||
|
|
// the canonical identifier.
|
||
|
|
IANA *Index
|
||
|
|
)
|
||
|
|
|
||
|
|
// Index maps names registered by IANA to Encodings.
|
||
|
|
type Index struct {
|
||
|
|
}
|
||
|
|
|
||
|
|
// Get returns an Encoding for IANA-registered names. Matching is
|
||
|
|
// case-insensitive.
|
||
|
|
func (x *Index) Get(name string) (encoding.Encoding, error) {
|
||
|
|
panic("TODO: implement")
|
||
|
|
}
|
||
|
|
|
||
|
|
// Name reports the canonical name of the given Encoding. It will return an
|
||
|
|
// error if the e is not associated with a known encoding scheme.
|
||
|
|
func (x *Index) Name(e encoding.Encoding) (string, error) {
|
||
|
|
panic("TODO: implement")
|
||
|
|
}
|
||
|
|
|
||
|
|
// TODO: the coverage of this index is rather spotty. Allowing users to set
|
||
|
|
// encodings would allow:
|
||
|
|
// - users to increase coverage
|
||
|
|
// - allow a partially loaded set of encodings in case the user doesn't need to
|
||
|
|
// them all.
|
||
|
|
// - write an OS-specific wrapper for supported encodings and set them.
|
||
|
|
// The exact definition of Set depends a bit on if and how we want to let users
|
||
|
|
// write their own Encoding implementations. Also, it is not possible yet to
|
||
|
|
// only partially load the encodings without doing some refactoring. Until this
|
||
|
|
// is solved, we might as well not support Set.
|
||
|
|
// // Set sets the e to be used for the encoding scheme identified by name. Only
|
||
|
|
// // canonical names may be used. An empty name assigns e to its internally
|
||
|
|
// // associated encoding scheme.
|
||
|
|
// func (x *Index) Set(name string, e encoding.Encoding) error {
|
||
|
|
// panic("TODO: implement")
|
||
|
|
// }
|