From 621e49bb465f500cc46d47e39e828cf76d6381d7 Mon Sep 17 00:00:00 2001 From: Dimitri Sokolyuk Date: Tue, 24 Jul 2018 14:35:44 +0200 Subject: update vendor --- vendor/golang.org/x/text/internal/number/format.go | 540 +++++++++++++++++++++ 1 file changed, 540 insertions(+) create mode 100644 vendor/golang.org/x/text/internal/number/format.go (limited to 'vendor/golang.org/x/text/internal/number/format.go') diff --git a/vendor/golang.org/x/text/internal/number/format.go b/vendor/golang.org/x/text/internal/number/format.go new file mode 100644 index 0000000..910bdeb --- /dev/null +++ b/vendor/golang.org/x/text/internal/number/format.go @@ -0,0 +1,540 @@ +// Copyright 2017 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 number + +import ( + "strconv" + "unicode/utf8" + + "golang.org/x/text/language" +) + +// TODO: +// - grouping of fractions +// - allow user-defined superscript notation (such as 4) +// - same for non-breaking spaces, like   + +// A VisibleDigits computes digits, comma placement and trailing zeros as they +// will be shown to the user. +type VisibleDigits interface { + Digits(buf []byte, t language.Tag, scale int) Digits + // TODO: Do we also need to add the verb or pass a format.State? +} + +// Formatting proceeds along the following lines: +// 0) Compose rounding information from format and context. +// 1) Convert a number into a Decimal. +// 2) Sanitize Decimal by adding trailing zeros, removing leading digits, and +// (non-increment) rounding. The Decimal that results from this is suitable +// for determining the plural form. +// 3) Render the Decimal in the localized form. + +// Formatter contains all the information needed to render a number. +type Formatter struct { + Pattern + Info +} + +func (f *Formatter) init(t language.Tag, index []uint8) { + f.Info = InfoFromTag(t) + for ; ; t = t.Parent() { + if ci, ok := language.CompactIndex(t); ok { + f.Pattern = formats[index[ci]] + break + } + } +} + +// InitPattern initializes a Formatter for the given Pattern. +func (f *Formatter) InitPattern(t language.Tag, pat *Pattern) { + f.Info = InfoFromTag(t) + f.Pattern = *pat +} + +// InitDecimal initializes a Formatter using the default Pattern for the given +// language. +func (f *Formatter) InitDecimal(t language.Tag) { + f.init(t, tagToDecimal) +} + +// InitScientific initializes a Formatter using the default Pattern for the +// given language. +func (f *Formatter) InitScientific(t language.Tag) { + f.init(t, tagToScientific) + f.Pattern.MinFractionDigits = 0 + f.Pattern.MaxFractionDigits = -1 +} + +// InitEngineering initializes a Formatter using the default Pattern for the +// given language. +func (f *Formatter) InitEngineering(t language.Tag) { + f.init(t, tagToScientific) + f.Pattern.MinFractionDigits = 0 + f.Pattern.MaxFractionDigits = -1 + f.Pattern.MaxIntegerDigits = 3 + f.Pattern.MinIntegerDigits = 1 +} + +// InitPercent initializes a Formatter using the default Pattern for the given +// language. +func (f *Formatter) InitPercent(t language.Tag) { + f.init(t, tagToPercent) +} + +// InitPerMille initializes a Formatter using the default Pattern for the given +// language. +func (f *Formatter) InitPerMille(t language.Tag) { + f.init(t, tagToPercent) + f.Pattern.DigitShift = 3 +} + +func (f *Formatter) Append(dst []byte, x interface{}) []byte { + var d Decimal + r := f.RoundingContext + d.Convert(r, x) + return f.Render(dst, FormatDigits(&d, r)) +} + +func FormatDigits(d *Decimal, r RoundingContext) Digits { + if r.isScientific() { + return scientificVisibleDigits(r, d) + } + return decimalVisibleDigits(r, d) +} + +func (f *Formatter) Format(dst []byte, d *Decimal) []byte { + return f.Render(dst, FormatDigits(d, f.RoundingContext)) +} + +func (f *Formatter) Render(dst []byte, d Digits) []byte { + var result []byte + var postPrefix, preSuffix int + if d.IsScientific { + result, postPrefix, preSuffix = appendScientific(dst, f, &d) + } else { + result, postPrefix, preSuffix = appendDecimal(dst, f, &d) + } + if f.PadRune == 0 { + return result + } + width := int(f.FormatWidth) + if count := utf8.RuneCount(result); count < width { + insertPos := 0 + switch f.Flags & PadMask { + case PadAfterPrefix: + insertPos = postPrefix + case PadBeforeSuffix: + insertPos = preSuffix + case PadAfterSuffix: + insertPos = len(result) + } + num := width - count + pad := [utf8.UTFMax]byte{' '} + sz := 1 + if r := f.PadRune; r != 0 { + sz = utf8.EncodeRune(pad[:], r) + } + extra := sz * num + if n := len(result) + extra; n < cap(result) { + result = result[:n] + copy(result[insertPos+extra:], result[insertPos:]) + } else { + buf := make([]byte, n) + copy(buf, result[:insertPos]) + copy(buf[insertPos+extra:], result[insertPos:]) + result = buf + } + for ; num > 0; num-- { + insertPos += copy(result[insertPos:], pad[:sz]) + } + } + return result +} + +// decimalVisibleDigits converts d according to the RoundingContext. Note that +// the exponent may change as a result of this operation. +func decimalVisibleDigits(r RoundingContext, d *Decimal) Digits { + if d.NaN || d.Inf { + return Digits{digits: digits{Neg: d.Neg, NaN: d.NaN, Inf: d.Inf}} + } + n := Digits{digits: d.normalize().digits} + + exp := n.Exp + exp += int32(r.DigitShift) + + // Cap integer digits. Remove *most-significant* digits. + if r.MaxIntegerDigits > 0 { + if p := int(exp) - int(r.MaxIntegerDigits); p > 0 { + if p > len(n.Digits) { + p = len(n.Digits) + } + if n.Digits = n.Digits[p:]; len(n.Digits) == 0 { + exp = 0 + } else { + exp -= int32(p) + } + // Strip leading zeros. + for len(n.Digits) > 0 && n.Digits[0] == 0 { + n.Digits = n.Digits[1:] + exp-- + } + } + } + + // Rounding if not already done by Convert. + p := len(n.Digits) + if maxSig := int(r.MaxSignificantDigits); maxSig > 0 { + p = maxSig + } + if maxFrac := int(r.MaxFractionDigits); maxFrac >= 0 { + if cap := int(exp) + maxFrac; cap < p { + p = int(exp) + maxFrac + } + if p < 0 { + p = 0 + } + } + n.round(r.Mode, p) + + // set End (trailing zeros) + n.End = int32(len(n.Digits)) + if n.End == 0 { + exp = 0 + if r.MinFractionDigits > 0 { + n.End = int32(r.MinFractionDigits) + } + if p := int32(r.MinSignificantDigits) - 1; p > n.End { + n.End = p + } + } else { + if end := exp + int32(r.MinFractionDigits); end > n.End { + n.End = end + } + if n.End < int32(r.MinSignificantDigits) { + n.End = int32(r.MinSignificantDigits) + } + } + n.Exp = exp + return n +} + +// appendDecimal appends a formatted number to dst. It returns two possible +// insertion points for padding. +func appendDecimal(dst []byte, f *Formatter, n *Digits) (b []byte, postPre, preSuf int) { + if dst, ok := f.renderSpecial(dst, n); ok { + return dst, 0, len(dst) + } + digits := n.Digits + exp := n.Exp + + // Split in integer and fraction part. + var intDigits, fracDigits []byte + numInt := 0 + numFrac := int(n.End - n.Exp) + if exp > 0 { + numInt = int(exp) + if int(exp) >= len(digits) { // ddddd | ddddd00 + intDigits = digits + } else { // ddd.dd + intDigits = digits[:exp] + fracDigits = digits[exp:] + } + } else { + fracDigits = digits + } + + neg := n.Neg + affix, suffix := f.getAffixes(neg) + dst = appendAffix(dst, f, affix, neg) + savedLen := len(dst) + + minInt := int(f.MinIntegerDigits) + if minInt == 0 && f.MinSignificantDigits > 0 { + minInt = 1 + } + // add leading zeros + for i := minInt; i > numInt; i-- { + dst = f.AppendDigit(dst, 0) + if f.needsSep(i) { + dst = append(dst, f.Symbol(SymGroup)...) + } + } + i := 0 + for ; i < len(intDigits); i++ { + dst = f.AppendDigit(dst, intDigits[i]) + if f.needsSep(numInt - i) { + dst = append(dst, f.Symbol(SymGroup)...) + } + } + for ; i < numInt; i++ { + dst = f.AppendDigit(dst, 0) + if f.needsSep(numInt - i) { + dst = append(dst, f.Symbol(SymGroup)...) + } + } + + if numFrac > 0 || f.Flags&AlwaysDecimalSeparator != 0 { + dst = append(dst, f.Symbol(SymDecimal)...) + } + // Add trailing zeros + i = 0 + for n := -int(n.Exp); i < n; i++ { + dst = f.AppendDigit(dst, 0) + } + for _, d := range fracDigits { + i++ + dst = f.AppendDigit(dst, d) + } + for ; i < numFrac; i++ { + dst = f.AppendDigit(dst, 0) + } + return appendAffix(dst, f, suffix, neg), savedLen, len(dst) +} + +func scientificVisibleDigits(r RoundingContext, d *Decimal) Digits { + if d.NaN || d.Inf { + return Digits{digits: digits{Neg: d.Neg, NaN: d.NaN, Inf: d.Inf}} + } + n := Digits{digits: d.normalize().digits, IsScientific: true} + + // Normalize to have at least one digit. This simplifies engineering + // notation. + if len(n.Digits) == 0 { + n.Digits = append(n.Digits, 0) + n.Exp = 1 + } + + // Significant digits are transformed by the parser for scientific notation + // and do not need to be handled here. + maxInt, numInt := int(r.MaxIntegerDigits), int(r.MinIntegerDigits) + if numInt == 0 { + numInt = 1 + } + + // If a maximum number of integers is specified, the minimum must be 1 + // and the exponent is grouped by this number (e.g. for engineering) + if maxInt > numInt { + // Correct the exponent to reflect a single integer digit. + numInt = 1 + // engineering + // 0.01234 ([12345]e-1) -> 1.2345e-2 12.345e-3 + // 12345 ([12345]e+5) -> 1.2345e4 12.345e3 + d := int(n.Exp-1) % maxInt + if d < 0 { + d += maxInt + } + numInt += d + } + + p := len(n.Digits) + if maxSig := int(r.MaxSignificantDigits); maxSig > 0 { + p = maxSig + } + if maxFrac := int(r.MaxFractionDigits); maxFrac >= 0 && numInt+maxFrac < p { + p = numInt + maxFrac + } + n.round(r.Mode, p) + + n.Comma = uint8(numInt) + n.End = int32(len(n.Digits)) + if minSig := int32(r.MinFractionDigits) + int32(numInt); n.End < minSig { + n.End = minSig + } + return n +} + +// appendScientific appends a formatted number to dst. It returns two possible +// insertion points for padding. +func appendScientific(dst []byte, f *Formatter, n *Digits) (b []byte, postPre, preSuf int) { + if dst, ok := f.renderSpecial(dst, n); ok { + return dst, 0, 0 + } + digits := n.Digits + numInt := int(n.Comma) + numFrac := int(n.End) - int(n.Comma) + + var intDigits, fracDigits []byte + if numInt <= len(digits) { + intDigits = digits[:numInt] + fracDigits = digits[numInt:] + } else { + intDigits = digits + } + neg := n.Neg + affix, suffix := f.getAffixes(neg) + dst = appendAffix(dst, f, affix, neg) + savedLen := len(dst) + + i := 0 + for ; i < len(intDigits); i++ { + dst = f.AppendDigit(dst, intDigits[i]) + if f.needsSep(numInt - i) { + dst = append(dst, f.Symbol(SymGroup)...) + } + } + for ; i < numInt; i++ { + dst = f.AppendDigit(dst, 0) + if f.needsSep(numInt - i) { + dst = append(dst, f.Symbol(SymGroup)...) + } + } + + if numFrac > 0 || f.Flags&AlwaysDecimalSeparator != 0 { + dst = append(dst, f.Symbol(SymDecimal)...) + } + i = 0 + for ; i < len(fracDigits); i++ { + dst = f.AppendDigit(dst, fracDigits[i]) + } + for ; i < numFrac; i++ { + dst = f.AppendDigit(dst, 0) + } + + // exp + buf := [12]byte{} + // TODO: use exponential if superscripting is not available (no Latin + // numbers or no tags) and use exponential in all other cases. + exp := n.Exp - int32(n.Comma) + exponential := f.Symbol(SymExponential) + if exponential == "E" { + dst = append(dst, "\u202f"...) // NARROW NO-BREAK SPACE + dst = append(dst, f.Symbol(SymSuperscriptingExponent)...) + dst = append(dst, "\u202f"...) // NARROW NO-BREAK SPACE + dst = f.AppendDigit(dst, 1) + dst = f.AppendDigit(dst, 0) + switch { + case exp < 0: + dst = append(dst, superMinus...) + exp = -exp + case f.Flags&AlwaysExpSign != 0: + dst = append(dst, superPlus...) + } + b = strconv.AppendUint(buf[:0], uint64(exp), 10) + for i := len(b); i < int(f.MinExponentDigits); i++ { + dst = append(dst, superDigits[0]...) + } + for _, c := range b { + dst = append(dst, superDigits[c-'0']...) + } + } else { + dst = append(dst, exponential...) + switch { + case exp < 0: + dst = append(dst, f.Symbol(SymMinusSign)...) + exp = -exp + case f.Flags&AlwaysExpSign != 0: + dst = append(dst, f.Symbol(SymPlusSign)...) + } + b = strconv.AppendUint(buf[:0], uint64(exp), 10) + for i := len(b); i < int(f.MinExponentDigits); i++ { + dst = f.AppendDigit(dst, 0) + } + for _, c := range b { + dst = f.AppendDigit(dst, c-'0') + } + } + return appendAffix(dst, f, suffix, neg), savedLen, len(dst) +} + +const ( + superMinus = "\u207B" // SUPERSCRIPT HYPHEN-MINUS + superPlus = "\u207A" // SUPERSCRIPT PLUS SIGN +) + +var ( + // Note: the digits are not sequential!!! + superDigits = []string{ + "\u2070", // SUPERSCRIPT DIGIT ZERO + "\u00B9", // SUPERSCRIPT DIGIT ONE + "\u00B2", // SUPERSCRIPT DIGIT TWO + "\u00B3", // SUPERSCRIPT DIGIT THREE + "\u2074", // SUPERSCRIPT DIGIT FOUR + "\u2075", // SUPERSCRIPT DIGIT FIVE + "\u2076", // SUPERSCRIPT DIGIT SIX + "\u2077", // SUPERSCRIPT DIGIT SEVEN + "\u2078", // SUPERSCRIPT DIGIT EIGHT + "\u2079", // SUPERSCRIPT DIGIT NINE + } +) + +func (f *Formatter) getAffixes(neg bool) (affix, suffix string) { + str := f.Affix + if str != "" { + if f.NegOffset > 0 { + if neg { + str = str[f.NegOffset:] + } else { + str = str[:f.NegOffset] + } + } + sufStart := 1 + str[0] + affix = str[1:sufStart] + suffix = str[sufStart+1:] + } + // TODO: introduce a NeedNeg sign to indicate if the left pattern already + // has a sign marked? + if f.NegOffset == 0 && (neg || f.Flags&AlwaysSign != 0) { + affix = "-" + affix + } + return affix, suffix +} + +func (f *Formatter) renderSpecial(dst []byte, d *Digits) (b []byte, ok bool) { + if d.NaN { + return fmtNaN(dst, f), true + } + if d.Inf { + return fmtInfinite(dst, f, d), true + } + return dst, false +} + +func fmtNaN(dst []byte, f *Formatter) []byte { + return append(dst, f.Symbol(SymNan)...) +} + +func fmtInfinite(dst []byte, f *Formatter, d *Digits) []byte { + affix, suffix := f.getAffixes(d.Neg) + dst = appendAffix(dst, f, affix, d.Neg) + dst = append(dst, f.Symbol(SymInfinity)...) + dst = appendAffix(dst, f, suffix, d.Neg) + return dst +} + +func appendAffix(dst []byte, f *Formatter, affix string, neg bool) []byte { + quoting := false + escaping := false + for _, r := range affix { + switch { + case escaping: + // escaping occurs both inside and outside of quotes + dst = append(dst, string(r)...) + escaping = false + case r == '\\': + escaping = true + case r == '\'': + quoting = !quoting + case quoting: + dst = append(dst, string(r)...) + case r == '%': + if f.DigitShift == 3 { + dst = append(dst, f.Symbol(SymPerMille)...) + } else { + dst = append(dst, f.Symbol(SymPercentSign)...) + } + case r == '-' || r == '+': + if neg { + dst = append(dst, f.Symbol(SymMinusSign)...) + } else if f.Flags&ElideSign == 0 { + dst = append(dst, f.Symbol(SymPlusSign)...) + } else { + dst = append(dst, ' ') + } + default: + dst = append(dst, string(r)...) + } + } + return dst +} -- cgit v1.2.3