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https://github.com/gdamore/tcell.git
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7322e40c26
fixes #38 Broke wide characters in last update fixes #39 Clean up logic for encodings, enhance fallback options fixes #36 Support more mouse buttons on Windows.
92 lines
2.3 KiB
Go
92 lines
2.3 KiB
Go
// Copyright 2015 The TCell Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use file except in compliance with the License.
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// You may obtain a copy of the license at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package tcell
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import (
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"unicode/utf8"
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"golang.org/x/text/encoding"
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"golang.org/x/text/transform"
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)
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type ascii struct{ transform.NopResetter }
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type asciiDecoder struct{ transform.NopResetter }
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type asciiEncoder struct{ transform.NopResetter }
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// ASCII represents an basic 7-bit ASCII scheme. It decodes directly to UTF-8
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// without change, as all ASCII values are legal UTF-8. It encodes any UTF-8
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// runes outside of ASCII to 0x1A, the ASCII substitution character.
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var ASCII encoding.Encoding = ascii{}
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func (ascii) NewDecoder() transform.Transformer {
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return asciiDecoder{}
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}
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func (ascii) NewEncoder() transform.Transformer {
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return asciiEncoder{}
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}
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func (asciiDecoder) Transform(dst, src []byte, atEOF bool) (int, int, error) {
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var e error
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var ndst, nsrc int
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for _, c := range src {
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if ndst >= len(dst) {
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e = transform.ErrShortDst
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break
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}
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dst[ndst] = c
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ndst++
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nsrc++
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}
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return ndst, nsrc, e
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}
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func (asciiEncoder) Transform(dst, src []byte, atEOF bool) (int, int, error) {
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var e error
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var ndst, nsrc int
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var sz int
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for nsrc < len(src) {
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if ndst >= len(dst) {
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e = transform.ErrShortDst
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break
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}
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r := rune(src[nsrc])
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if r < utf8.RuneSelf {
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dst[ndst] = uint8(r)
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nsrc++
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ndst++
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continue
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}
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// No valid runes beyond ASCII. However, we need to consume
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// the full rune, and report incomplete runes properly.
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// Attempt to decode a multibyte rune
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r, sz = utf8.DecodeRune(src[nsrc:])
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if sz == 1 {
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// If its inconclusive due to insufficient data in
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// in the source, report it
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if !atEOF && !utf8.FullRune(src[nsrc:]) {
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e = transform.ErrShortSrc
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break
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}
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}
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nsrc += sz
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dst[ndst] = encoding.ASCIISub
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ndst++
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}
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return ndst, nsrc, e
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}
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