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path: root/vendor/golang.org/x/text/message/format.go
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Diffstat (limited to 'vendor/golang.org/x/text/message/format.go')
-rw-r--r--vendor/golang.org/x/text/message/format.go510
1 files changed, 0 insertions, 510 deletions
diff --git a/vendor/golang.org/x/text/message/format.go b/vendor/golang.org/x/text/message/format.go
deleted file mode 100644
index a47d17d..0000000
--- a/vendor/golang.org/x/text/message/format.go
+++ /dev/null
@@ -1,510 +0,0 @@
-// 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:])
-}