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Diffstat (limited to 'vendor/golang.org/x/text/width/transform.go')
| -rw-r--r-- | vendor/golang.org/x/text/width/transform.go | 239 |
1 files changed, 0 insertions, 239 deletions
diff --git a/vendor/golang.org/x/text/width/transform.go b/vendor/golang.org/x/text/width/transform.go deleted file mode 100644 index 0049f70..0000000 --- a/vendor/golang.org/x/text/width/transform.go +++ /dev/null @@ -1,239 +0,0 @@ -// 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 width - -import ( - "unicode/utf8" - - "golang.org/x/text/transform" -) - -type foldTransform struct { - transform.NopResetter -} - -func (foldTransform) Span(src []byte, atEOF bool) (n int, err error) { - for n < len(src) { - if src[n] < utf8.RuneSelf { - // ASCII fast path. - for n++; n < len(src) && src[n] < utf8.RuneSelf; n++ { - } - continue - } - v, size := trie.lookup(src[n:]) - if size == 0 { // incomplete UTF-8 encoding - if !atEOF { - err = transform.ErrShortSrc - } else { - n = len(src) - } - break - } - if elem(v)&tagNeedsFold != 0 { - err = transform.ErrEndOfSpan - break - } - n += size - } - return n, err -} - -func (foldTransform) Transform(dst, src []byte, atEOF bool) (nDst, nSrc int, err error) { - for nSrc < len(src) { - if src[nSrc] < utf8.RuneSelf { - // ASCII fast path. - start, end := nSrc, len(src) - if d := len(dst) - nDst; d < end-start { - end = nSrc + d - } - for nSrc++; nSrc < end && src[nSrc] < utf8.RuneSelf; nSrc++ { - } - n := copy(dst[nDst:], src[start:nSrc]) - if nDst += n; nDst == len(dst) { - nSrc = start + n - if nSrc == len(src) { - return nDst, nSrc, nil - } - if src[nSrc] < utf8.RuneSelf { - return nDst, nSrc, transform.ErrShortDst - } - } - continue - } - v, size := trie.lookup(src[nSrc:]) - if size == 0 { // incomplete UTF-8 encoding - if !atEOF { - return nDst, nSrc, transform.ErrShortSrc - } - size = 1 // gobble 1 byte - } - if elem(v)&tagNeedsFold == 0 { - if size != copy(dst[nDst:], src[nSrc:nSrc+size]) { - return nDst, nSrc, transform.ErrShortDst - } - nDst += size - } else { - data := inverseData[byte(v)] - if len(dst)-nDst < int(data[0]) { - return nDst, nSrc, transform.ErrShortDst - } - i := 1 - for end := int(data[0]); i < end; i++ { - dst[nDst] = data[i] - nDst++ - } - dst[nDst] = data[i] ^ src[nSrc+size-1] - nDst++ - } - nSrc += size - } - return nDst, nSrc, nil -} - -type narrowTransform struct { - transform.NopResetter -} - -func (narrowTransform) Span(src []byte, atEOF bool) (n int, err error) { - for n < len(src) { - if src[n] < utf8.RuneSelf { - // ASCII fast path. - for n++; n < len(src) && src[n] < utf8.RuneSelf; n++ { - } - continue - } - v, size := trie.lookup(src[n:]) - if size == 0 { // incomplete UTF-8 encoding - if !atEOF { - err = transform.ErrShortSrc - } else { - n = len(src) - } - break - } - if k := elem(v).kind(); byte(v) == 0 || k != EastAsianFullwidth && k != EastAsianWide && k != EastAsianAmbiguous { - } else { - err = transform.ErrEndOfSpan - break - } - n += size - } - return n, err -} - -func (narrowTransform) Transform(dst, src []byte, atEOF bool) (nDst, nSrc int, err error) { - for nSrc < len(src) { - if src[nSrc] < utf8.RuneSelf { - // ASCII fast path. - start, end := nSrc, len(src) - if d := len(dst) - nDst; d < end-start { - end = nSrc + d - } - for nSrc++; nSrc < end && src[nSrc] < utf8.RuneSelf; nSrc++ { - } - n := copy(dst[nDst:], src[start:nSrc]) - if nDst += n; nDst == len(dst) { - nSrc = start + n - if nSrc == len(src) { - return nDst, nSrc, nil - } - if src[nSrc] < utf8.RuneSelf { - return nDst, nSrc, transform.ErrShortDst - } - } - continue - } - v, size := trie.lookup(src[nSrc:]) - if size == 0 { // incomplete UTF-8 encoding - if !atEOF { - return nDst, nSrc, transform.ErrShortSrc - } - size = 1 // gobble 1 byte - } - if k := elem(v).kind(); byte(v) == 0 || k != EastAsianFullwidth && k != EastAsianWide && k != EastAsianAmbiguous { - if size != copy(dst[nDst:], src[nSrc:nSrc+size]) { - return nDst, nSrc, transform.ErrShortDst - } - nDst += size - } else { - data := inverseData[byte(v)] - if len(dst)-nDst < int(data[0]) { - return nDst, nSrc, transform.ErrShortDst - } - i := 1 - for end := int(data[0]); i < end; i++ { - dst[nDst] = data[i] - nDst++ - } - dst[nDst] = data[i] ^ src[nSrc+size-1] - nDst++ - } - nSrc += size - } - return nDst, nSrc, nil -} - -type wideTransform struct { - transform.NopResetter -} - -func (wideTransform) Span(src []byte, atEOF bool) (n int, err error) { - for n < len(src) { - // TODO: Consider ASCII fast path. Special-casing ASCII handling can - // reduce the ns/op of BenchmarkWideASCII by about 30%. This is probably - // not enough to warrant the extra code and complexity. - v, size := trie.lookup(src[n:]) - if size == 0 { // incomplete UTF-8 encoding - if !atEOF { - err = transform.ErrShortSrc - } else { - n = len(src) - } - break - } - if k := elem(v).kind(); byte(v) == 0 || k != EastAsianHalfwidth && k != EastAsianNarrow { - } else { - err = transform.ErrEndOfSpan - break - } - n += size - } - return n, err -} - -func (wideTransform) Transform(dst, src []byte, atEOF bool) (nDst, nSrc int, err error) { - for nSrc < len(src) { - // TODO: Consider ASCII fast path. Special-casing ASCII handling can - // reduce the ns/op of BenchmarkWideASCII by about 30%. This is probably - // not enough to warrant the extra code and complexity. - v, size := trie.lookup(src[nSrc:]) - if size == 0 { // incomplete UTF-8 encoding - if !atEOF { - return nDst, nSrc, transform.ErrShortSrc - } - size = 1 // gobble 1 byte - } - if k := elem(v).kind(); byte(v) == 0 || k != EastAsianHalfwidth && k != EastAsianNarrow { - if size != copy(dst[nDst:], src[nSrc:nSrc+size]) { - return nDst, nSrc, transform.ErrShortDst - } - nDst += size - } else { - data := inverseData[byte(v)] - if len(dst)-nDst < int(data[0]) { - return nDst, nSrc, transform.ErrShortDst - } - i := 1 - for end := int(data[0]); i < end; i++ { - dst[nDst] = data[i] - nDst++ - } - dst[nDst] = data[i] ^ src[nSrc+size-1] - nDst++ - } - nSrc += size - } - return nDst, nSrc, nil -} |