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/message/format.go | 510 +++++++++++++++++++++++++++++ 1 file changed, 510 insertions(+) create mode 100644 vendor/golang.org/x/text/message/format.go (limited to 'vendor/golang.org/x/text/message/format.go') diff --git a/vendor/golang.org/x/text/message/format.go b/vendor/golang.org/x/text/message/format.go new file mode 100644 index 0000000..a47d17d --- /dev/null +++ b/vendor/golang.org/x/text/message/format.go @@ -0,0 +1,510 @@ +// 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 message + +import ( + "bytes" + "strconv" + "unicode/utf8" + + "golang.org/x/text/internal/format" +) + +const ( + ldigits = "0123456789abcdefx" + udigits = "0123456789ABCDEFX" +) + +const ( + signed = true + unsigned = false +) + +// A formatInfo is the raw formatter used by Printf etc. +// It prints into a buffer that must be set up separately. +type formatInfo struct { + buf *bytes.Buffer + + format.Parser + + // intbuf is large enough to store %b of an int64 with a sign and + // avoids padding at the end of the struct on 32 bit architectures. + intbuf [68]byte +} + +func (f *formatInfo) init(buf *bytes.Buffer) { + f.ClearFlags() + f.buf = buf +} + +// writePadding generates n bytes of padding. +func (f *formatInfo) writePadding(n int) { + if n <= 0 { // No padding bytes needed. + return + } + f.buf.Grow(n) + // Decide which byte the padding should be filled with. + padByte := byte(' ') + if f.Zero { + padByte = byte('0') + } + // Fill padding with padByte. + for i := 0; i < n; i++ { + f.buf.WriteByte(padByte) // TODO: make more efficient. + } +} + +// pad appends b to f.buf, padded on left (!f.minus) or right (f.minus). +func (f *formatInfo) pad(b []byte) { + if !f.WidthPresent || f.Width == 0 { + f.buf.Write(b) + return + } + width := f.Width - utf8.RuneCount(b) + if !f.Minus { + // left padding + f.writePadding(width) + f.buf.Write(b) + } else { + // right padding + f.buf.Write(b) + f.writePadding(width) + } +} + +// padString appends s to f.buf, padded on left (!f.minus) or right (f.minus). +func (f *formatInfo) padString(s string) { + if !f.WidthPresent || f.Width == 0 { + f.buf.WriteString(s) + return + } + width := f.Width - utf8.RuneCountInString(s) + if !f.Minus { + // left padding + f.writePadding(width) + f.buf.WriteString(s) + } else { + // right padding + f.buf.WriteString(s) + f.writePadding(width) + } +} + +// fmt_boolean formats a boolean. +func (f *formatInfo) fmt_boolean(v bool) { + if v { + f.padString("true") + } else { + f.padString("false") + } +} + +// fmt_unicode formats a uint64 as "U+0078" or with f.sharp set as "U+0078 'x'". +func (f *formatInfo) fmt_unicode(u uint64) { + buf := f.intbuf[0:] + + // With default precision set the maximum needed buf length is 18 + // for formatting -1 with %#U ("U+FFFFFFFFFFFFFFFF") which fits + // into the already allocated intbuf with a capacity of 68 bytes. + prec := 4 + if f.PrecPresent && f.Prec > 4 { + prec = f.Prec + // Compute space needed for "U+" , number, " '", character, "'". + width := 2 + prec + 2 + utf8.UTFMax + 1 + if width > len(buf) { + buf = make([]byte, width) + } + } + + // Format into buf, ending at buf[i]. Formatting numbers is easier right-to-left. + i := len(buf) + + // For %#U we want to add a space and a quoted character at the end of the buffer. + if f.Sharp && u <= utf8.MaxRune && strconv.IsPrint(rune(u)) { + i-- + buf[i] = '\'' + i -= utf8.RuneLen(rune(u)) + utf8.EncodeRune(buf[i:], rune(u)) + i-- + buf[i] = '\'' + i-- + buf[i] = ' ' + } + // Format the Unicode code point u as a hexadecimal number. + for u >= 16 { + i-- + buf[i] = udigits[u&0xF] + prec-- + u >>= 4 + } + i-- + buf[i] = udigits[u] + prec-- + // Add zeros in front of the number until requested precision is reached. + for prec > 0 { + i-- + buf[i] = '0' + prec-- + } + // Add a leading "U+". + i-- + buf[i] = '+' + i-- + buf[i] = 'U' + + oldZero := f.Zero + f.Zero = false + f.pad(buf[i:]) + f.Zero = oldZero +} + +// fmt_integer formats signed and unsigned integers. +func (f *formatInfo) fmt_integer(u uint64, base int, isSigned bool, digits string) { + negative := isSigned && int64(u) < 0 + if negative { + u = -u + } + + buf := f.intbuf[0:] + // The already allocated f.intbuf with a capacity of 68 bytes + // is large enough for integer formatting when no precision or width is set. + if f.WidthPresent || f.PrecPresent { + // Account 3 extra bytes for possible addition of a sign and "0x". + width := 3 + f.Width + f.Prec // wid and prec are always positive. + if width > len(buf) { + // We're going to need a bigger boat. + buf = make([]byte, width) + } + } + + // Two ways to ask for extra leading zero digits: %.3d or %03d. + // If both are specified the f.zero flag is ignored and + // padding with spaces is used instead. + prec := 0 + if f.PrecPresent { + prec = f.Prec + // Precision of 0 and value of 0 means "print nothing" but padding. + if prec == 0 && u == 0 { + oldZero := f.Zero + f.Zero = false + f.writePadding(f.Width) + f.Zero = oldZero + return + } + } else if f.Zero && f.WidthPresent { + prec = f.Width + if negative || f.Plus || f.Space { + prec-- // leave room for sign + } + } + + // Because printing is easier right-to-left: format u into buf, ending at buf[i]. + // We could make things marginally faster by splitting the 32-bit case out + // into a separate block but it's not worth the duplication, so u has 64 bits. + i := len(buf) + // Use constants for the division and modulo for more efficient code. + // Switch cases ordered by popularity. + switch base { + case 10: + for u >= 10 { + i-- + next := u / 10 + buf[i] = byte('0' + u - next*10) + u = next + } + case 16: + for u >= 16 { + i-- + buf[i] = digits[u&0xF] + u >>= 4 + } + case 8: + for u >= 8 { + i-- + buf[i] = byte('0' + u&7) + u >>= 3 + } + case 2: + for u >= 2 { + i-- + buf[i] = byte('0' + u&1) + u >>= 1 + } + default: + panic("fmt: unknown base; can't happen") + } + i-- + buf[i] = digits[u] + for i > 0 && prec > len(buf)-i { + i-- + buf[i] = '0' + } + + // Various prefixes: 0x, -, etc. + if f.Sharp { + switch base { + case 8: + if buf[i] != '0' { + i-- + buf[i] = '0' + } + case 16: + // Add a leading 0x or 0X. + i-- + buf[i] = digits[16] + i-- + buf[i] = '0' + } + } + + if negative { + i-- + buf[i] = '-' + } else if f.Plus { + i-- + buf[i] = '+' + } else if f.Space { + i-- + buf[i] = ' ' + } + + // Left padding with zeros has already been handled like precision earlier + // or the f.zero flag is ignored due to an explicitly set precision. + oldZero := f.Zero + f.Zero = false + f.pad(buf[i:]) + f.Zero = oldZero +} + +// truncate truncates the string to the specified precision, if present. +func (f *formatInfo) truncate(s string) string { + if f.PrecPresent { + n := f.Prec + for i := range s { + n-- + if n < 0 { + return s[:i] + } + } + } + return s +} + +// fmt_s formats a string. +func (f *formatInfo) fmt_s(s string) { + s = f.truncate(s) + f.padString(s) +} + +// fmt_sbx formats a string or byte slice as a hexadecimal encoding of its bytes. +func (f *formatInfo) fmt_sbx(s string, b []byte, digits string) { + length := len(b) + if b == nil { + // No byte slice present. Assume string s should be encoded. + length = len(s) + } + // Set length to not process more bytes than the precision demands. + if f.PrecPresent && f.Prec < length { + length = f.Prec + } + // Compute width of the encoding taking into account the f.sharp and f.space flag. + width := 2 * length + if width > 0 { + if f.Space { + // Each element encoded by two hexadecimals will get a leading 0x or 0X. + if f.Sharp { + width *= 2 + } + // Elements will be separated by a space. + width += length - 1 + } else if f.Sharp { + // Only a leading 0x or 0X will be added for the whole string. + width += 2 + } + } else { // The byte slice or string that should be encoded is empty. + if f.WidthPresent { + f.writePadding(f.Width) + } + return + } + // Handle padding to the left. + if f.WidthPresent && f.Width > width && !f.Minus { + f.writePadding(f.Width - width) + } + // Write the encoding directly into the output buffer. + buf := f.buf + if f.Sharp { + // Add leading 0x or 0X. + buf.WriteByte('0') + buf.WriteByte(digits[16]) + } + var c byte + for i := 0; i < length; i++ { + if f.Space && i > 0 { + // Separate elements with a space. + buf.WriteByte(' ') + if f.Sharp { + // Add leading 0x or 0X for each element. + buf.WriteByte('0') + buf.WriteByte(digits[16]) + } + } + if b != nil { + c = b[i] // Take a byte from the input byte slice. + } else { + c = s[i] // Take a byte from the input string. + } + // Encode each byte as two hexadecimal digits. + buf.WriteByte(digits[c>>4]) + buf.WriteByte(digits[c&0xF]) + } + // Handle padding to the right. + if f.WidthPresent && f.Width > width && f.Minus { + f.writePadding(f.Width - width) + } +} + +// fmt_sx formats a string as a hexadecimal encoding of its bytes. +func (f *formatInfo) fmt_sx(s, digits string) { + f.fmt_sbx(s, nil, digits) +} + +// fmt_bx formats a byte slice as a hexadecimal encoding of its bytes. +func (f *formatInfo) fmt_bx(b []byte, digits string) { + f.fmt_sbx("", b, digits) +} + +// fmt_q formats a string as a double-quoted, escaped Go string constant. +// If f.sharp is set a raw (backquoted) string may be returned instead +// if the string does not contain any control characters other than tab. +func (f *formatInfo) fmt_q(s string) { + s = f.truncate(s) + if f.Sharp && strconv.CanBackquote(s) { + f.padString("`" + s + "`") + return + } + buf := f.intbuf[:0] + if f.Plus { + f.pad(strconv.AppendQuoteToASCII(buf, s)) + } else { + f.pad(strconv.AppendQuote(buf, s)) + } +} + +// fmt_c formats an integer as a Unicode character. +// If the character is not valid Unicode, it will print '\ufffd'. +func (f *formatInfo) fmt_c(c uint64) { + r := rune(c) + if c > utf8.MaxRune { + r = utf8.RuneError + } + buf := f.intbuf[:0] + w := utf8.EncodeRune(buf[:utf8.UTFMax], r) + f.pad(buf[:w]) +} + +// fmt_qc formats an integer as a single-quoted, escaped Go character constant. +// If the character is not valid Unicode, it will print '\ufffd'. +func (f *formatInfo) fmt_qc(c uint64) { + r := rune(c) + if c > utf8.MaxRune { + r = utf8.RuneError + } + buf := f.intbuf[:0] + if f.Plus { + f.pad(strconv.AppendQuoteRuneToASCII(buf, r)) + } else { + f.pad(strconv.AppendQuoteRune(buf, r)) + } +} + +// fmt_float formats a float64. It assumes that verb is a valid format specifier +// for strconv.AppendFloat and therefore fits into a byte. +func (f *formatInfo) fmt_float(v float64, size int, verb rune, prec int) { + // Explicit precision in format specifier overrules default precision. + if f.PrecPresent { + prec = f.Prec + } + // Format number, reserving space for leading + sign if needed. + num := strconv.AppendFloat(f.intbuf[:1], v, byte(verb), prec, size) + if num[1] == '-' || num[1] == '+' { + num = num[1:] + } else { + num[0] = '+' + } + // f.space means to add a leading space instead of a "+" sign unless + // the sign is explicitly asked for by f.plus. + if f.Space && num[0] == '+' && !f.Plus { + num[0] = ' ' + } + // Special handling for infinities and NaN, + // which don't look like a number so shouldn't be padded with zeros. + if num[1] == 'I' || num[1] == 'N' { + oldZero := f.Zero + f.Zero = false + // Remove sign before NaN if not asked for. + if num[1] == 'N' && !f.Space && !f.Plus { + num = num[1:] + } + f.pad(num) + f.Zero = oldZero + return + } + // The sharp flag forces printing a decimal point for non-binary formats + // and retains trailing zeros, which we may need to restore. + if f.Sharp && verb != 'b' { + digits := 0 + switch verb { + case 'v', 'g', 'G': + digits = prec + // If no precision is set explicitly use a precision of 6. + if digits == -1 { + digits = 6 + } + } + + // Buffer pre-allocated with enough room for + // exponent notations of the form "e+123". + var tailBuf [5]byte + tail := tailBuf[:0] + + hasDecimalPoint := false + // Starting from i = 1 to skip sign at num[0]. + for i := 1; i < len(num); i++ { + switch num[i] { + case '.': + hasDecimalPoint = true + case 'e', 'E': + tail = append(tail, num[i:]...) + num = num[:i] + default: + digits-- + } + } + if !hasDecimalPoint { + num = append(num, '.') + } + for digits > 0 { + num = append(num, '0') + digits-- + } + num = append(num, tail...) + } + // We want a sign if asked for and if the sign is not positive. + if f.Plus || num[0] != '+' { + // If we're zero padding to the left we want the sign before the leading zeros. + // Achieve this by writing the sign out and then padding the unsigned number. + if f.Zero && f.WidthPresent && f.Width > len(num) { + f.buf.WriteByte(num[0]) + f.writePadding(f.Width - len(num)) + f.buf.Write(num[1:]) + return + } + f.pad(num) + return + } + // No sign to show and the number is positive; just print the unsigned number. + f.pad(num[1:]) +} -- cgit v1.2.3