diff options
author | Elad <theman@elad.im> | 2018-06-05 18:40:21 +0800 |
---|---|---|
committer | Balint Gabor <balint.g@gmail.com> | 2018-06-05 18:40:21 +0800 |
commit | 5bee5d69d743e2c91e8aa0f322e4de3834bb6664 (patch) | |
tree | 7157caf164b1882ed04eabc492f311a663a3fb0f /vendor/golang.org/x/text/unicode/norm/normalize.go | |
parent | cbfb40b0aab093e1b612f3b16834894b2cc67882 (diff) | |
download | go-tangerine-5bee5d69d743e2c91e8aa0f322e4de3834bb6664.tar go-tangerine-5bee5d69d743e2c91e8aa0f322e4de3834bb6664.tar.gz go-tangerine-5bee5d69d743e2c91e8aa0f322e4de3834bb6664.tar.bz2 go-tangerine-5bee5d69d743e2c91e8aa0f322e4de3834bb6664.tar.lz go-tangerine-5bee5d69d743e2c91e8aa0f322e4de3834bb6664.tar.xz go-tangerine-5bee5d69d743e2c91e8aa0f322e4de3834bb6664.tar.zst go-tangerine-5bee5d69d743e2c91e8aa0f322e4de3834bb6664.zip |
vendor: added vendor packages necessary for the swarm-network-rewrite merge (#16792)
* vendor: added vendor packages necessary for the swarm-network-rewrite merge into ethereum master
* vendor: removed multihash deps
Diffstat (limited to 'vendor/golang.org/x/text/unicode/norm/normalize.go')
-rw-r--r-- | vendor/golang.org/x/text/unicode/norm/normalize.go | 609 |
1 files changed, 609 insertions, 0 deletions
diff --git a/vendor/golang.org/x/text/unicode/norm/normalize.go b/vendor/golang.org/x/text/unicode/norm/normalize.go new file mode 100644 index 000000000..e28ac641a --- /dev/null +++ b/vendor/golang.org/x/text/unicode/norm/normalize.go @@ -0,0 +1,609 @@ +// Copyright 2011 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. + +// Note: the file data_test.go that is generated should not be checked in. +//go:generate go run maketables.go triegen.go +//go:generate go test -tags test + +// Package norm contains types and functions for normalizing Unicode strings. +package norm // import "golang.org/x/text/unicode/norm" + +import ( + "unicode/utf8" + + "golang.org/x/text/transform" +) + +// A Form denotes a canonical representation of Unicode code points. +// The Unicode-defined normalization and equivalence forms are: +// +// NFC Unicode Normalization Form C +// NFD Unicode Normalization Form D +// NFKC Unicode Normalization Form KC +// NFKD Unicode Normalization Form KD +// +// For a Form f, this documentation uses the notation f(x) to mean +// the bytes or string x converted to the given form. +// A position n in x is called a boundary if conversion to the form can +// proceed independently on both sides: +// f(x) == append(f(x[0:n]), f(x[n:])...) +// +// References: http://unicode.org/reports/tr15/ and +// http://unicode.org/notes/tn5/. +type Form int + +const ( + NFC Form = iota + NFD + NFKC + NFKD +) + +// Bytes returns f(b). May return b if f(b) = b. +func (f Form) Bytes(b []byte) []byte { + src := inputBytes(b) + ft := formTable[f] + n, ok := ft.quickSpan(src, 0, len(b), true) + if ok { + return b + } + out := make([]byte, n, len(b)) + copy(out, b[0:n]) + rb := reorderBuffer{f: *ft, src: src, nsrc: len(b), out: out, flushF: appendFlush} + return doAppendInner(&rb, n) +} + +// String returns f(s). +func (f Form) String(s string) string { + src := inputString(s) + ft := formTable[f] + n, ok := ft.quickSpan(src, 0, len(s), true) + if ok { + return s + } + out := make([]byte, n, len(s)) + copy(out, s[0:n]) + rb := reorderBuffer{f: *ft, src: src, nsrc: len(s), out: out, flushF: appendFlush} + return string(doAppendInner(&rb, n)) +} + +// IsNormal returns true if b == f(b). +func (f Form) IsNormal(b []byte) bool { + src := inputBytes(b) + ft := formTable[f] + bp, ok := ft.quickSpan(src, 0, len(b), true) + if ok { + return true + } + rb := reorderBuffer{f: *ft, src: src, nsrc: len(b)} + rb.setFlusher(nil, cmpNormalBytes) + for bp < len(b) { + rb.out = b[bp:] + if bp = decomposeSegment(&rb, bp, true); bp < 0 { + return false + } + bp, _ = rb.f.quickSpan(rb.src, bp, len(b), true) + } + return true +} + +func cmpNormalBytes(rb *reorderBuffer) bool { + b := rb.out + for i := 0; i < rb.nrune; i++ { + info := rb.rune[i] + if int(info.size) > len(b) { + return false + } + p := info.pos + pe := p + info.size + for ; p < pe; p++ { + if b[0] != rb.byte[p] { + return false + } + b = b[1:] + } + } + return true +} + +// IsNormalString returns true if s == f(s). +func (f Form) IsNormalString(s string) bool { + src := inputString(s) + ft := formTable[f] + bp, ok := ft.quickSpan(src, 0, len(s), true) + if ok { + return true + } + rb := reorderBuffer{f: *ft, src: src, nsrc: len(s)} + rb.setFlusher(nil, func(rb *reorderBuffer) bool { + for i := 0; i < rb.nrune; i++ { + info := rb.rune[i] + if bp+int(info.size) > len(s) { + return false + } + p := info.pos + pe := p + info.size + for ; p < pe; p++ { + if s[bp] != rb.byte[p] { + return false + } + bp++ + } + } + return true + }) + for bp < len(s) { + if bp = decomposeSegment(&rb, bp, true); bp < 0 { + return false + } + bp, _ = rb.f.quickSpan(rb.src, bp, len(s), true) + } + return true +} + +// patchTail fixes a case where a rune may be incorrectly normalized +// if it is followed by illegal continuation bytes. It returns the +// patched buffer and whether the decomposition is still in progress. +func patchTail(rb *reorderBuffer) bool { + info, p := lastRuneStart(&rb.f, rb.out) + if p == -1 || info.size == 0 { + return true + } + end := p + int(info.size) + extra := len(rb.out) - end + if extra > 0 { + // Potentially allocating memory. However, this only + // happens with ill-formed UTF-8. + x := make([]byte, 0) + x = append(x, rb.out[len(rb.out)-extra:]...) + rb.out = rb.out[:end] + decomposeToLastBoundary(rb) + rb.doFlush() + rb.out = append(rb.out, x...) + return false + } + buf := rb.out[p:] + rb.out = rb.out[:p] + decomposeToLastBoundary(rb) + if s := rb.ss.next(info); s == ssStarter { + rb.doFlush() + rb.ss.first(info) + } else if s == ssOverflow { + rb.doFlush() + rb.insertCGJ() + rb.ss = 0 + } + rb.insertUnsafe(inputBytes(buf), 0, info) + return true +} + +func appendQuick(rb *reorderBuffer, i int) int { + if rb.nsrc == i { + return i + } + end, _ := rb.f.quickSpan(rb.src, i, rb.nsrc, true) + rb.out = rb.src.appendSlice(rb.out, i, end) + return end +} + +// Append returns f(append(out, b...)). +// The buffer out must be nil, empty, or equal to f(out). +func (f Form) Append(out []byte, src ...byte) []byte { + return f.doAppend(out, inputBytes(src), len(src)) +} + +func (f Form) doAppend(out []byte, src input, n int) []byte { + if n == 0 { + return out + } + ft := formTable[f] + // Attempt to do a quickSpan first so we can avoid initializing the reorderBuffer. + if len(out) == 0 { + p, _ := ft.quickSpan(src, 0, n, true) + out = src.appendSlice(out, 0, p) + if p == n { + return out + } + rb := reorderBuffer{f: *ft, src: src, nsrc: n, out: out, flushF: appendFlush} + return doAppendInner(&rb, p) + } + rb := reorderBuffer{f: *ft, src: src, nsrc: n} + return doAppend(&rb, out, 0) +} + +func doAppend(rb *reorderBuffer, out []byte, p int) []byte { + rb.setFlusher(out, appendFlush) + src, n := rb.src, rb.nsrc + doMerge := len(out) > 0 + if q := src.skipContinuationBytes(p); q > p { + // Move leading non-starters to destination. + rb.out = src.appendSlice(rb.out, p, q) + p = q + doMerge = patchTail(rb) + } + fd := &rb.f + if doMerge { + var info Properties + if p < n { + info = fd.info(src, p) + if !info.BoundaryBefore() || info.nLeadingNonStarters() > 0 { + if p == 0 { + decomposeToLastBoundary(rb) + } + p = decomposeSegment(rb, p, true) + } + } + if info.size == 0 { + rb.doFlush() + // Append incomplete UTF-8 encoding. + return src.appendSlice(rb.out, p, n) + } + if rb.nrune > 0 { + return doAppendInner(rb, p) + } + } + p = appendQuick(rb, p) + return doAppendInner(rb, p) +} + +func doAppendInner(rb *reorderBuffer, p int) []byte { + for n := rb.nsrc; p < n; { + p = decomposeSegment(rb, p, true) + p = appendQuick(rb, p) + } + return rb.out +} + +// AppendString returns f(append(out, []byte(s))). +// The buffer out must be nil, empty, or equal to f(out). +func (f Form) AppendString(out []byte, src string) []byte { + return f.doAppend(out, inputString(src), len(src)) +} + +// QuickSpan returns a boundary n such that b[0:n] == f(b[0:n]). +// It is not guaranteed to return the largest such n. +func (f Form) QuickSpan(b []byte) int { + n, _ := formTable[f].quickSpan(inputBytes(b), 0, len(b), true) + return n +} + +// Span implements transform.SpanningTransformer. It returns a boundary n such +// that b[0:n] == f(b[0:n]). It is not guaranteed to return the largest such n. +func (f Form) Span(b []byte, atEOF bool) (n int, err error) { + n, ok := formTable[f].quickSpan(inputBytes(b), 0, len(b), atEOF) + if n < len(b) { + if !ok { + err = transform.ErrEndOfSpan + } else { + err = transform.ErrShortSrc + } + } + return n, err +} + +// SpanString returns a boundary n such that s[0:n] == f(s[0:n]). +// It is not guaranteed to return the largest such n. +func (f Form) SpanString(s string, atEOF bool) (n int, err error) { + n, ok := formTable[f].quickSpan(inputString(s), 0, len(s), atEOF) + if n < len(s) { + if !ok { + err = transform.ErrEndOfSpan + } else { + err = transform.ErrShortSrc + } + } + return n, err +} + +// quickSpan returns a boundary n such that src[0:n] == f(src[0:n]) and +// whether any non-normalized parts were found. If atEOF is false, n will +// not point past the last segment if this segment might be become +// non-normalized by appending other runes. +func (f *formInfo) quickSpan(src input, i, end int, atEOF bool) (n int, ok bool) { + var lastCC uint8 + ss := streamSafe(0) + lastSegStart := i + for n = end; i < n; { + if j := src.skipASCII(i, n); i != j { + i = j + lastSegStart = i - 1 + lastCC = 0 + ss = 0 + continue + } + info := f.info(src, i) + if info.size == 0 { + if atEOF { + // include incomplete runes + return n, true + } + return lastSegStart, true + } + // This block needs to be before the next, because it is possible to + // have an overflow for runes that are starters (e.g. with U+FF9E). + switch ss.next(info) { + case ssStarter: + lastSegStart = i + case ssOverflow: + return lastSegStart, false + case ssSuccess: + if lastCC > info.ccc { + return lastSegStart, false + } + } + if f.composing { + if !info.isYesC() { + break + } + } else { + if !info.isYesD() { + break + } + } + lastCC = info.ccc + i += int(info.size) + } + if i == n { + if !atEOF { + n = lastSegStart + } + return n, true + } + return lastSegStart, false +} + +// QuickSpanString returns a boundary n such that s[0:n] == f(s[0:n]). +// It is not guaranteed to return the largest such n. +func (f Form) QuickSpanString(s string) int { + n, _ := formTable[f].quickSpan(inputString(s), 0, len(s), true) + return n +} + +// FirstBoundary returns the position i of the first boundary in b +// or -1 if b contains no boundary. +func (f Form) FirstBoundary(b []byte) int { + return f.firstBoundary(inputBytes(b), len(b)) +} + +func (f Form) firstBoundary(src input, nsrc int) int { + i := src.skipContinuationBytes(0) + if i >= nsrc { + return -1 + } + fd := formTable[f] + ss := streamSafe(0) + // We should call ss.first here, but we can't as the first rune is + // skipped already. This means FirstBoundary can't really determine + // CGJ insertion points correctly. Luckily it doesn't have to. + for { + info := fd.info(src, i) + if info.size == 0 { + return -1 + } + if s := ss.next(info); s != ssSuccess { + return i + } + i += int(info.size) + if i >= nsrc { + if !info.BoundaryAfter() && !ss.isMax() { + return -1 + } + return nsrc + } + } +} + +// FirstBoundaryInString returns the position i of the first boundary in s +// or -1 if s contains no boundary. +func (f Form) FirstBoundaryInString(s string) int { + return f.firstBoundary(inputString(s), len(s)) +} + +// NextBoundary reports the index of the boundary between the first and next +// segment in b or -1 if atEOF is false and there are not enough bytes to +// determine this boundary. +func (f Form) NextBoundary(b []byte, atEOF bool) int { + return f.nextBoundary(inputBytes(b), len(b), atEOF) +} + +// NextBoundaryInString reports the index of the boundary between the first and +// next segment in b or -1 if atEOF is false and there are not enough bytes to +// determine this boundary. +func (f Form) NextBoundaryInString(s string, atEOF bool) int { + return f.nextBoundary(inputString(s), len(s), atEOF) +} + +func (f Form) nextBoundary(src input, nsrc int, atEOF bool) int { + if nsrc == 0 { + if atEOF { + return 0 + } + return -1 + } + fd := formTable[f] + info := fd.info(src, 0) + if info.size == 0 { + if atEOF { + return 1 + } + return -1 + } + ss := streamSafe(0) + ss.first(info) + + for i := int(info.size); i < nsrc; i += int(info.size) { + info = fd.info(src, i) + if info.size == 0 { + if atEOF { + return i + } + return -1 + } + // TODO: Using streamSafe to determine the boundary isn't the same as + // using BoundaryBefore. Determine which should be used. + if s := ss.next(info); s != ssSuccess { + return i + } + } + if !atEOF && !info.BoundaryAfter() && !ss.isMax() { + return -1 + } + return nsrc +} + +// LastBoundary returns the position i of the last boundary in b +// or -1 if b contains no boundary. +func (f Form) LastBoundary(b []byte) int { + return lastBoundary(formTable[f], b) +} + +func lastBoundary(fd *formInfo, b []byte) int { + i := len(b) + info, p := lastRuneStart(fd, b) + if p == -1 { + return -1 + } + if info.size == 0 { // ends with incomplete rune + if p == 0 { // starts with incomplete rune + return -1 + } + i = p + info, p = lastRuneStart(fd, b[:i]) + if p == -1 { // incomplete UTF-8 encoding or non-starter bytes without a starter + return i + } + } + if p+int(info.size) != i { // trailing non-starter bytes: illegal UTF-8 + return i + } + if info.BoundaryAfter() { + return i + } + ss := streamSafe(0) + v := ss.backwards(info) + for i = p; i >= 0 && v != ssStarter; i = p { + info, p = lastRuneStart(fd, b[:i]) + if v = ss.backwards(info); v == ssOverflow { + break + } + if p+int(info.size) != i { + if p == -1 { // no boundary found + return -1 + } + return i // boundary after an illegal UTF-8 encoding + } + } + return i +} + +// decomposeSegment scans the first segment in src into rb. It inserts 0x034f +// (Grapheme Joiner) when it encounters a sequence of more than 30 non-starters +// and returns the number of bytes consumed from src or iShortDst or iShortSrc. +func decomposeSegment(rb *reorderBuffer, sp int, atEOF bool) int { + // Force one character to be consumed. + info := rb.f.info(rb.src, sp) + if info.size == 0 { + return 0 + } + if s := rb.ss.next(info); s == ssStarter { + // TODO: this could be removed if we don't support merging. + if rb.nrune > 0 { + goto end + } + } else if s == ssOverflow { + rb.insertCGJ() + goto end + } + if err := rb.insertFlush(rb.src, sp, info); err != iSuccess { + return int(err) + } + for { + sp += int(info.size) + if sp >= rb.nsrc { + if !atEOF && !info.BoundaryAfter() { + return int(iShortSrc) + } + break + } + info = rb.f.info(rb.src, sp) + if info.size == 0 { + if !atEOF { + return int(iShortSrc) + } + break + } + if s := rb.ss.next(info); s == ssStarter { + break + } else if s == ssOverflow { + rb.insertCGJ() + break + } + if err := rb.insertFlush(rb.src, sp, info); err != iSuccess { + return int(err) + } + } +end: + if !rb.doFlush() { + return int(iShortDst) + } + return sp +} + +// lastRuneStart returns the runeInfo and position of the last +// rune in buf or the zero runeInfo and -1 if no rune was found. +func lastRuneStart(fd *formInfo, buf []byte) (Properties, int) { + p := len(buf) - 1 + for ; p >= 0 && !utf8.RuneStart(buf[p]); p-- { + } + if p < 0 { + return Properties{}, -1 + } + return fd.info(inputBytes(buf), p), p +} + +// decomposeToLastBoundary finds an open segment at the end of the buffer +// and scans it into rb. Returns the buffer minus the last segment. +func decomposeToLastBoundary(rb *reorderBuffer) { + fd := &rb.f + info, i := lastRuneStart(fd, rb.out) + if int(info.size) != len(rb.out)-i { + // illegal trailing continuation bytes + return + } + if info.BoundaryAfter() { + return + } + var add [maxNonStarters + 1]Properties // stores runeInfo in reverse order + padd := 0 + ss := streamSafe(0) + p := len(rb.out) + for { + add[padd] = info + v := ss.backwards(info) + if v == ssOverflow { + // Note that if we have an overflow, it the string we are appending to + // is not correctly normalized. In this case the behavior is undefined. + break + } + padd++ + p -= int(info.size) + if v == ssStarter || p < 0 { + break + } + info, i = lastRuneStart(fd, rb.out[:p]) + if int(info.size) != p-i { + break + } + } + rb.ss = ss + // Copy bytes for insertion as we may need to overwrite rb.out. + var buf [maxBufferSize * utf8.UTFMax]byte + cp := buf[:copy(buf[:], rb.out[p:])] + rb.out = rb.out[:p] + for padd--; padd >= 0; padd-- { + info = add[padd] + rb.insertUnsafe(inputBytes(cp), 0, info) + cp = cp[info.size:] + } +} |