+++ /dev/null
-// 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.
-
-//go:generate go run gen.go
-
-// 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 (
- "errors"
- "sort"
- "strings"
-
- "golang.org/x/text/encoding"
- "golang.org/x/text/encoding/charmap"
- "golang.org/x/text/encoding/internal/identifier"
- "golang.org/x/text/encoding/japanese"
- "golang.org/x/text/encoding/korean"
- "golang.org/x/text/encoding/simplifiedchinese"
- "golang.org/x/text/encoding/traditionalchinese"
- "golang.org/x/text/encoding/unicode"
-)
-
-// TODO: remove the "Status... incomplete" in the package doc comment.
-// 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.
- MIME *Index = mime
-
- // IANA is an index that supports all names and aliases using IANA names as
- // the canonical identifier.
- IANA *Index = iana
-
- // MIB is an index that associates the MIB display name with an Encoding.
- MIB *Index = mib
-
- mime = &Index{mimeName, ianaToMIB, ianaAliases, encodings[:]}
- iana = &Index{ianaName, ianaToMIB, ianaAliases, encodings[:]}
- mib = &Index{mibName, ianaToMIB, ianaAliases, encodings[:]}
-)
-
-// Index maps names registered by IANA to Encodings.
-// Currently different Indexes only differ in the names they return for
-// encodings. In the future they may also differ in supported aliases.
-type Index struct {
- names func(i int) string
- toMIB []identifier.MIB // Sorted slice of supported MIBs
- alias map[string]int
- enc []encoding.Encoding
-}
-
-var (
- errInvalidName = errors.New("ianaindex: invalid encoding name")
- errUnknown = errors.New("ianaindex: unknown Encoding")
- errUnsupported = errors.New("ianaindex: unsupported Encoding")
-)
-
-// Encoding returns an Encoding for IANA-registered names. Matching is
-// case-insensitive.
-func (x *Index) Encoding(name string) (encoding.Encoding, error) {
- name = strings.TrimSpace(name)
- // First try without lowercasing (possibly creating an allocation).
- i, ok := x.alias[name]
- if !ok {
- i, ok = x.alias[strings.ToLower(name)]
- if !ok {
- return nil, errInvalidName
- }
- }
- return x.enc[i], nil
-}
-
-// 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) {
- id, ok := e.(identifier.Interface)
- if !ok {
- return "", errUnknown
- }
- mib, _ := id.ID()
- if mib == 0 {
- return "", errUnknown
- }
- v := findMIB(x.toMIB, mib)
- if v == -1 {
- return "", errUnsupported
- }
- return x.names(v), nil
-}
-
-// 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")
-// }
-
-func findMIB(x []identifier.MIB, mib identifier.MIB) int {
- i := sort.Search(len(x), func(i int) bool { return x[i] >= mib })
- if i < len(x) && x[i] == mib {
- return i
- }
- return -1
-}
-
-const maxMIMENameLen = '0' - 1 // officially 40, but we leave some buffer.
-
-func mimeName(x int) string {
- n := ianaNames[x]
- // See gen.go for a description of the encoding.
- if n[0] <= maxMIMENameLen {
- return n[1:n[0]]
- }
- return n
-}
-
-func ianaName(x int) string {
- n := ianaNames[x]
- // See gen.go for a description of the encoding.
- if n[0] <= maxMIMENameLen {
- return n[n[0]:]
- }
- return n
-}
-
-func mibName(x int) string {
- return mibNames[x]
-}
-
-var encodings = [numIANA]encoding.Encoding{
- enc106: unicode.UTF8,
- enc1015: unicode.UTF16(unicode.BigEndian, unicode.UseBOM),
- enc1013: unicode.UTF16(unicode.BigEndian, unicode.IgnoreBOM),
- enc1014: unicode.UTF16(unicode.LittleEndian, unicode.IgnoreBOM),
- enc2028: charmap.CodePage037,
- enc2011: charmap.CodePage437,
- enc2009: charmap.CodePage850,
- enc2010: charmap.CodePage852,
- enc2046: charmap.CodePage855,
- enc2089: charmap.CodePage858,
- enc2048: charmap.CodePage860,
- enc2013: charmap.CodePage862,
- enc2050: charmap.CodePage863,
- enc2052: charmap.CodePage865,
- enc2086: charmap.CodePage866,
- enc2102: charmap.CodePage1047,
- enc2091: charmap.CodePage1140,
- enc4: charmap.ISO8859_1,
- enc5: charmap.ISO8859_2,
- enc6: charmap.ISO8859_3,
- enc7: charmap.ISO8859_4,
- enc8: charmap.ISO8859_5,
- enc9: charmap.ISO8859_6,
- enc81: charmap.ISO8859_6E,
- enc82: charmap.ISO8859_6I,
- enc10: charmap.ISO8859_7,
- enc11: charmap.ISO8859_8,
- enc84: charmap.ISO8859_8E,
- enc85: charmap.ISO8859_8I,
- enc12: charmap.ISO8859_9,
- enc13: charmap.ISO8859_10,
- enc109: charmap.ISO8859_13,
- enc110: charmap.ISO8859_14,
- enc111: charmap.ISO8859_15,
- enc112: charmap.ISO8859_16,
- enc2084: charmap.KOI8R,
- enc2088: charmap.KOI8U,
- enc2027: charmap.Macintosh,
- enc2109: charmap.Windows874,
- enc2250: charmap.Windows1250,
- enc2251: charmap.Windows1251,
- enc2252: charmap.Windows1252,
- enc2253: charmap.Windows1253,
- enc2254: charmap.Windows1254,
- enc2255: charmap.Windows1255,
- enc2256: charmap.Windows1256,
- enc2257: charmap.Windows1257,
- enc2258: charmap.Windows1258,
- enc18: japanese.EUCJP,
- enc39: japanese.ISO2022JP,
- enc17: japanese.ShiftJIS,
- enc38: korean.EUCKR,
- enc114: simplifiedchinese.GB18030,
- enc113: simplifiedchinese.GBK,
- enc2085: simplifiedchinese.HZGB2312,
- enc2026: traditionalchinese.Big5,
-}
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