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