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116 lines
3.2 KiB
Go
116 lines
3.2 KiB
Go
// Copyright GoFrame Author(https://goframe.org). All Rights Reserved.
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//
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// This Source Code Form is subject to the terms of the MIT License.
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// If a copy of the MIT was not distributed with this file,
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// You can obtain one at https://github.com/gogf/gf.
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// Package gcharset implements character-set conversion functionality.
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//
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// Supported Character Set:
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//
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// Chinese : GBK/GB18030/GB2312/Big5
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//
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// Japanese: EUCJP/ISO2022JP/ShiftJIS
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//
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// Korean : EUCKR
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//
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// Unicode : UTF-8/UTF-16/UTF-16BE/UTF-16LE
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//
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// Other : macintosh/IBM*/Windows*/ISO-*
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package gcharset
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import (
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"bytes"
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"context"
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"io"
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"golang.org/x/text/encoding"
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"golang.org/x/text/encoding/ianaindex"
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"golang.org/x/text/transform"
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"github.com/gogf/gf/v2/errors/gcode"
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"github.com/gogf/gf/v2/errors/gerror"
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"github.com/gogf/gf/v2/internal/intlog"
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)
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var (
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// Alias for charsets.
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charsetAlias = map[string]string{
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"HZGB2312": "HZ-GB-2312",
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"hzgb2312": "HZ-GB-2312",
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"GB2312": "HZ-GB-2312",
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"gb2312": "HZ-GB-2312",
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}
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)
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// Supported returns whether charset `charset` is supported.
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func Supported(charset string) bool {
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return getEncoding(charset) != nil
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}
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// Convert converts `src` charset encoding from `srcCharset` to `dstCharset`,
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// and returns the converted string.
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// It returns `src` as `dst` if it fails converting.
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func Convert(dstCharset string, srcCharset string, src string) (dst string, err error) {
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if dstCharset == srcCharset {
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return src, nil
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}
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dst = src
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// Converting `src` to UTF-8.
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if srcCharset != "UTF-8" {
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if e := getEncoding(srcCharset); e != nil {
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tmp, err := io.ReadAll(
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transform.NewReader(bytes.NewReader([]byte(src)), e.NewDecoder()),
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)
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if err != nil {
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return "", gerror.Wrapf(err, `convert string "%s" to utf8 failed`, srcCharset)
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}
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src = string(tmp)
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} else {
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return dst, gerror.NewCodef(gcode.CodeInvalidParameter, `unsupported srcCharset "%s"`, srcCharset)
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}
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}
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// Do the converting from UTF-8 to `dstCharset`.
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if dstCharset != "UTF-8" {
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if e := getEncoding(dstCharset); e != nil {
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tmp, err := io.ReadAll(
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transform.NewReader(bytes.NewReader([]byte(src)), e.NewEncoder()),
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)
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if err != nil {
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return "", gerror.Wrapf(err, `convert string from utf8 to "%s" failed`, dstCharset)
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}
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dst = string(tmp)
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} else {
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return dst, gerror.NewCodef(gcode.CodeInvalidParameter, `unsupported dstCharset "%s"`, dstCharset)
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}
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} else {
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dst = src
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}
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return dst, nil
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}
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// ToUTF8 converts `src` charset encoding from `srcCharset` to UTF-8 ,
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// and returns the converted string.
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func ToUTF8(srcCharset string, src string) (dst string, err error) {
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return Convert("UTF-8", srcCharset, src)
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}
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// UTF8To converts `src` charset encoding from UTF-8 to `dstCharset`,
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// and returns the converted string.
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func UTF8To(dstCharset string, src string) (dst string, err error) {
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return Convert(dstCharset, "UTF-8", src)
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}
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// getEncoding returns the encoding.Encoding interface object for `charset`.
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// It returns nil if `charset` is not supported.
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func getEncoding(charset string) encoding.Encoding {
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if c, ok := charsetAlias[charset]; ok {
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charset = c
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}
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enc, err := ianaindex.MIB.Encoding(charset)
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if err != nil {
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intlog.Errorf(context.TODO(), `%+v`, err)
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}
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return enc
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}
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