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// Copyright 2009 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 fmt
 
import (
        "bytes"
        "strconv"
        "unicode"
        "unicode/utf8"
)
 
const (
        nByte = 64
 
        ldigits = "0123456789abcdef"
        udigits = "0123456789ABCDEF"
)
 
const (
        signed   = true
        unsigned = false
)
 
var padZeroBytes = make([]byte, nByte)
var padSpaceBytes = make([]byte, nByte)
 
var newline = []byte{'\n'}
 
func init() {
        for i := 0; i < nByte; i++ {
                padZeroBytes[i] = '0'
                padSpaceBytes[i] = ' '
        }
}
 
// A fmt is the raw formatter used by Printf etc.
// It prints into a bytes.Buffer that must be set up externally.
type fmt struct {
        intbuf [nByte]byte
        buf    *bytes.Buffer
        // width, precision
        wid  int
        prec int
        // flags
        widPresent  bool
        precPresent bool
        minus       bool
        plus        bool
        sharp       bool
        space       bool
        unicode     bool
        uniQuote    bool // Use 'x'= prefix for %U if printable.
        zero        bool
}
 
func (f *fmt) clearflags() {
        f.wid = 0
        f.widPresent = false
        f.prec = 0
        f.precPresent = false
        f.minus = false
        f.plus = false
        f.sharp = false
        f.space = false
        f.unicode = false
        f.uniQuote = false
        f.zero = false
}
 
func (f *fmt) init(buf *bytes.Buffer) {
        f.buf = buf
        f.clearflags()
}
 
// Compute left and right padding widths (only one will be non-zero).
func (f *fmt) computePadding(width int) (padding []byte, leftWidth, rightWidth int) {
        left := !f.minus
        w := f.wid
        if w < 0 {
                left = false
                w = -w
        }
        w -= width
        if w > 0 {
                if left && f.zero {
                        return padZeroBytes, w, 0
                }
                if left {
                        return padSpaceBytes, w, 0
                } else {
                        // can't be zero padding on the right
                        return padSpaceBytes, 0, w
                }
        }
        return
}
 
// Generate n bytes of padding.
func (f *fmt) writePadding(n int, padding []byte) {
        for n > 0 {
                m := n
                if m > nByte {
                        m = nByte
                }
                f.buf.Write(padding[0:m])
                n -= m
        }
}
 
// Append b to f.buf, padded on left (w > 0) or right (w < 0 or f.minus)
// clear flags afterwards.
func (f *fmt) pad(b []byte) {
        var padding []byte
        var left, right int
        if f.widPresent && f.wid != 0 {
                padding, left, right = f.computePadding(len(b))
        }
        if left > 0 {
                f.writePadding(left, padding)
        }
        f.buf.Write(b)
        if right > 0 {
                f.writePadding(right, padding)
        }
}
 
// append s to buf, padded on left (w > 0) or right (w < 0 or f.minus).
// clear flags afterwards.
func (f *fmt) padString(s string) {
        var padding []byte
        var left, right int
        if f.widPresent && f.wid != 0 {
                padding, left, right = f.computePadding(utf8.RuneCountInString(s))
        }
        if left > 0 {
                f.writePadding(left, padding)
        }
        f.buf.WriteString(s)
        if right > 0 {
                f.writePadding(right, padding)
        }
}
 
func putint(buf []byte, base, val uint64, digits string) int {
        i := len(buf) - 1
        for val >= base {
                buf[i] = digits[val%base]
                i--
                val /= base
        }
        buf[i] = digits[val]
        return i - 1
}
 
var (
        trueBytes  = []byte("true")
        falseBytes = []byte("false")
)
 
// fmt_boolean formats a boolean.
func (f *fmt) fmt_boolean(v bool) {
        if v {
                f.pad(trueBytes)
        } else {
                f.pad(falseBytes)
        }
}
 
// integer; interprets prec but not wid.  Once formatted, result is sent to pad()
// and then flags are cleared.
func (f *fmt) integer(a int64, base uint64, signedness bool, digits string) {
        // precision of 0 and value of 0 means "print nothing"
        if f.precPresent && f.prec == 0 && a == 0 {
                return
        }
 
        var buf []byte = f.intbuf[0:]
        negative := signedness == signed && a < 0
        if negative {
                a = -a
        }
 
        // two ways to ask for extra leading zero digits: %.3d or %03d.
        // apparently the first cancels the second.
        prec := 0
        if f.precPresent {
                prec = f.prec
                f.zero = false
        } else if f.zero && f.widPresent && !f.minus && f.wid > 0 {
                prec = f.wid
                if negative || f.plus || f.space {
                        prec-- // leave room for sign
                }
        }
 
        // format a into buf, ending at buf[i].  (printing is easier right-to-left.)
        // a is made into unsigned ua.  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 ua has 64 bits.
        i := len(f.intbuf)
        ua := uint64(a)
        for ua >= base {
                i--
                buf[i] = digits[ua%base]
                ua /= base
        }
        i--
        buf[i] = digits[ua]
        for i > 0 && prec > nByte-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:
                        i--
                        buf[i] = 'x' + digits[10] - 'a'
                        i--
                        buf[i] = '0'
                }
        }
        if f.unicode {
                i--
                buf[i] = '+'
                i--
                buf[i] = 'U'
        }
 
        if negative {
                i--
                buf[i] = '-'
        } else if f.plus {
                i--
                buf[i] = '+'
        } else if f.space {
                i--
                buf[i] = ' '
        }
 
        // If we want a quoted char for %#U, move the data up to make room.
        if f.unicode && f.uniQuote && a >= 0 && a <= unicode.MaxRune && unicode.IsPrint(rune(a)) {
                runeWidth := utf8.RuneLen(rune(a))
                width := 1 + 1 + runeWidth + 1 // space, quote, rune, quote
                copy(buf[i-width:], buf[i:])   // guaranteed to have enough room.
                i -= width
                // Now put " 'x'" at the end.
                j := len(buf) - width
                buf[j] = ' '
                j++
                buf[j] = '\''
                j++
                utf8.EncodeRune(buf[j:], rune(a))
                j += runeWidth
                buf[j] = '\''
        }
 
        f.pad(buf[i:])
}
 
// truncate truncates the string to the specified precision, if present.
func (f *fmt) truncate(s string) string {
        if f.precPresent && f.prec < utf8.RuneCountInString(s) {
                n := f.prec
                for i := range s {
                        if n == 0 {
                                s = s[:i]
                                break
                        }
                        n--
                }
        }
        return s
}
 
// fmt_s formats a string.
func (f *fmt) fmt_s(s string) {
        s = f.truncate(s)
        f.padString(s)
}
 
// fmt_sx formats a string as a hexadecimal encoding of its bytes.
func (f *fmt) fmt_sx(s, digits string) {
        // TODO: Avoid buffer by pre-padding.
        var b bytes.Buffer
        for i := 0; i < len(s); i++ {
                if i > 0 && f.space {
                        b.WriteByte(' ')
                }
                v := s[i]
                b.WriteByte(digits[v>>4])
                b.WriteByte(digits[v&0xF])
        }
        f.pad(b.Bytes())
}
 
// fmt_q formats a string as a double-quoted, escaped Go string constant.
func (f *fmt) fmt_q(s string) {
        s = f.truncate(s)
        var quoted string
        if f.sharp && strconv.CanBackquote(s) {
                quoted = "`" + s + "`"
        } else {
                if f.plus {
                        quoted = strconv.QuoteToASCII(s)
                } else {
                        quoted = strconv.Quote(s)
                }
        }
        f.padString(quoted)
}
 
// fmt_qc formats the integer as a single-quoted, escaped Go character constant.
// If the character is not valid Unicode, it will print '\ufffd'.
func (f *fmt) fmt_qc(c int64) {
        var quoted []byte
        if f.plus {
                quoted = strconv.AppendQuoteRuneToASCII(f.intbuf[0:0], rune(c))
        } else {
                quoted = strconv.AppendQuoteRune(f.intbuf[0:0], rune(c))
        }
        f.pad(quoted)
}
 
// floating-point
 
func doPrec(f *fmt, def int) int {
        if f.precPresent {
                return f.prec
        }
        return def
}
 
// formatFloat formats a float64; it is an efficient equivalent to  f.pad(strconv.FormatFloat()...).
func (f *fmt) formatFloat(v float64, verb byte, prec, n int) {
        // We leave one byte at the beginning of f.intbuf for a sign if needed,
        // and make it a space, which we might be able to use.
        f.intbuf[0] = ' '
        slice := strconv.AppendFloat(f.intbuf[0:1], v, verb, prec, n)
        // Add a plus sign or space to the floating-point string representation if missing and required.
        // The formatted number starts at slice[1].
        switch slice[1] {
        case '-', '+':
                // We're set; drop the leading space.
                slice = slice[1:]
        default:
                // There's no sign, but we might need one.
                if f.plus {
                        slice[0] = '+'
                } else if f.space {
                        // space is already there
                } else {
                        slice = slice[1:]
                }
        }
        f.pad(slice)
}
 
// fmt_e64 formats a float64 in the form -1.23e+12.
func (f *fmt) fmt_e64(v float64) { f.formatFloat(v, 'e', doPrec(f, 6), 64) }
 
// fmt_E64 formats a float64 in the form -1.23E+12.
func (f *fmt) fmt_E64(v float64) { f.formatFloat(v, 'E', doPrec(f, 6), 64) }
 
// fmt_f64 formats a float64 in the form -1.23.
func (f *fmt) fmt_f64(v float64) { f.formatFloat(v, 'f', doPrec(f, 6), 64) }
 
// fmt_g64 formats a float64 in the 'f' or 'e' form according to size.
func (f *fmt) fmt_g64(v float64) { f.formatFloat(v, 'g', doPrec(f, -1), 64) }
 
// fmt_g64 formats a float64 in the 'f' or 'E' form according to size.
func (f *fmt) fmt_G64(v float64) { f.formatFloat(v, 'G', doPrec(f, -1), 64) }
 
// fmt_fb64 formats a float64 in the form -123p3 (exponent is power of 2).
func (f *fmt) fmt_fb64(v float64) { f.formatFloat(v, 'b', 0, 64) }
 
// float32
// cannot defer to float64 versions
// because it will get rounding wrong in corner cases.
 
// fmt_e32 formats a float32 in the form -1.23e+12.
func (f *fmt) fmt_e32(v float32) { f.formatFloat(float64(v), 'e', doPrec(f, 6), 32) }
 
// fmt_E32 formats a float32 in the form -1.23E+12.
func (f *fmt) fmt_E32(v float32) { f.formatFloat(float64(v), 'E', doPrec(f, 6), 32) }
 
// fmt_f32 formats a float32 in the form -1.23.
func (f *fmt) fmt_f32(v float32) { f.formatFloat(float64(v), 'f', doPrec(f, 6), 32) }
 
// fmt_g32 formats a float32 in the 'f' or 'e' form according to size.
func (f *fmt) fmt_g32(v float32) { f.formatFloat(float64(v), 'g', doPrec(f, -1), 32) }
 
// fmt_G32 formats a float32 in the 'f' or 'E' form according to size.
func (f *fmt) fmt_G32(v float32) { f.formatFloat(float64(v), 'G', doPrec(f, -1), 32) }
 
// fmt_fb32 formats a float32 in the form -123p3 (exponent is power of 2).
func (f *fmt) fmt_fb32(v float32) { f.formatFloat(float64(v), 'b', 0, 32) }
 
// fmt_c64 formats a complex64 according to the verb.
func (f *fmt) fmt_c64(v complex64, verb rune) {
        f.buf.WriteByte('(')
        r := real(v)
        for i := 0; ; i++ {
                switch verb {
                case 'e':
                        f.fmt_e32(r)
                case 'E':
                        f.fmt_E32(r)
                case 'f':
                        f.fmt_f32(r)
                case 'g':
                        f.fmt_g32(r)
                case 'G':
                        f.fmt_G32(r)
                }
                if i != 0 {
                        break
                }
                f.plus = true
                r = imag(v)
        }
        f.buf.Write(irparenBytes)
}
 
// fmt_c128 formats a complex128 according to the verb.
func (f *fmt) fmt_c128(v complex128, verb rune) {
        f.buf.WriteByte('(')
        r := real(v)
        for i := 0; ; i++ {
                switch verb {
                case 'e':
                        f.fmt_e64(r)
                case 'E':
                        f.fmt_E64(r)
                case 'f':
                        f.fmt_f64(r)
                case 'g':
                        f.fmt_g64(r)
                case 'G':
                        f.fmt_G64(r)
                }
                if i != 0 {
                        break
                }
                f.plus = true
                r = imag(v)
        }
        f.buf.Write(irparenBytes)
}

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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgo/] [go/] [fmt/] [format.go] - Blame information for rev 801

Line No.	Rev	Author	Line
1	747	jeremybenn	`// Copyright 2009 The Go Authors. All rights reserved.`
2			`// Use of this source code is governed by a BSD-style`
3			`// license that can be found in the LICENSE file.`
4
5			`package fmt`
6
7			`import (`
8			`"bytes"`
9			`"strconv"`
10			`"unicode"`
11			`"unicode/utf8"`
12			`)`
13
14			`const (`
15			`nByte = 64`
16
17			`ldigits = "0123456789abcdef"`
18			`udigits = "0123456789ABCDEF"`
19			`)`
20
21			`const (`
22			`signed = true`
23			`unsigned = false`
24			`)`
25
26			`var padZeroBytes = make([]byte, nByte)`
27			`var padSpaceBytes = make([]byte, nByte)`
28
29			`var newline = []byte{'\n'}`
30
31			`func init() {`
32			`for i := 0; i < nByte; i++ {`
33			`padZeroBytes[i] = '0'`
34			`padSpaceBytes[i] = ' '`
35			`}`
36			`}`
37
38			`// A fmt is the raw formatter used by Printf etc.`
39			`// It prints into a bytes.Buffer that must be set up externally.`
40			`type fmt struct {`
41			`intbuf [nByte]byte`
42			`buf *bytes.Buffer`
43			`// width, precision`
44			`wid int`
45			`prec int`
46			`// flags`
47			`widPresent bool`
48			`precPresent bool`
49			`minus bool`
50			`plus bool`
51			`sharp bool`
52			`space bool`
53			`unicode bool`
54			`uniQuote bool // Use 'x'= prefix for %U if printable.`
55			`zero bool`
56			`}`
57
58			`func (f *fmt) clearflags() {`
59			`f.wid = 0`
60			`f.widPresent = false`
61			`f.prec = 0`
62			`f.precPresent = false`
63			`f.minus = false`
64			`f.plus = false`
65			`f.sharp = false`
66			`f.space = false`
67			`f.unicode = false`
68			`f.uniQuote = false`
69			`f.zero = false`
70			`}`
71
72			`func (f fmt) init(buf bytes.Buffer) {`
73			`f.buf = buf`
74			`f.clearflags()`
75			`}`
76
77			`// Compute left and right padding widths (only one will be non-zero).`
78			`func (f *fmt) computePadding(width int) (padding []byte, leftWidth, rightWidth int) {`
79			`left := !f.minus`
80			`w := f.wid`
81			`if w < 0 {`
82			`left = false`
83			`w = -w`
84			`}`
85			`w -= width`
86			`if w > 0 {`
87			`if left && f.zero {`
88			`return padZeroBytes, w, 0`
89			`}`
90			`if left {`
91			`return padSpaceBytes, w, 0`
92			`} else {`
93			`// can't be zero padding on the right`
94			`return padSpaceBytes, 0, w`
95			`}`
96			`}`
97			`return`
98			`}`
99
100			`// Generate n bytes of padding.`
101			`func (f *fmt) writePadding(n int, padding []byte) {`
102			`for n > 0 {`
103			`m := n`
104			`if m > nByte {`
105			`m = nByte`
106			`}`
107			`f.buf.Write(padding[0:m])`
108			`n -= m`
109			`}`
110			`}`
111
112			`// Append b to f.buf, padded on left (w > 0) or right (w < 0 or f.minus)`
113			`// clear flags afterwards.`
114			`func (f *fmt) pad(b []byte) {`
115			`var padding []byte`
116			`var left, right int`
117			`if f.widPresent && f.wid != 0 {`
118			`padding, left, right = f.computePadding(len(b))`
119			`}`
120			`if left > 0 {`
121			`f.writePadding(left, padding)`
122			`}`
123			`f.buf.Write(b)`
124			`if right > 0 {`
125			`f.writePadding(right, padding)`
126			`}`
127			`}`
128
129			`// append s to buf, padded on left (w > 0) or right (w < 0 or f.minus).`
130			`// clear flags afterwards.`
131			`func (f *fmt) padString(s string) {`
132			`var padding []byte`
133			`var left, right int`
134			`if f.widPresent && f.wid != 0 {`
135			`padding, left, right = f.computePadding(utf8.RuneCountInString(s))`
136			`}`
137			`if left > 0 {`
138			`f.writePadding(left, padding)`
139			`}`
140			`f.buf.WriteString(s)`
141			`if right > 0 {`
142			`f.writePadding(right, padding)`
143			`}`
144			`}`
145
146			`func putint(buf []byte, base, val uint64, digits string) int {`
147			`i := len(buf) - 1`
148			`for val >= base {`
149			`buf[i] = digits[val%base]`
150			`i--`
151			`val /= base`
152			`}`
153			`buf[i] = digits[val]`
154			`return i - 1`
155			`}`
156
157			`var (`
158			`trueBytes = []byte("true")`
159			`falseBytes = []byte("false")`
160			`)`
161
162			`// fmt_boolean formats a boolean.`
163			`func (f *fmt) fmt_boolean(v bool) {`
164			`if v {`
165			`f.pad(trueBytes)`
166			`} else {`
167			`f.pad(falseBytes)`
168			`}`
169			`}`
170
171			`// integer; interprets prec but not wid. Once formatted, result is sent to pad()`
172			`// and then flags are cleared.`
173			`func (f *fmt) integer(a int64, base uint64, signedness bool, digits string) {`
174			`// precision of 0 and value of 0 means "print nothing"`
175			`if f.precPresent && f.prec == 0 && a == 0 {`
176			`return`
177			`}`
178
179			`var buf []byte = f.intbuf[0:]`
180			`negative := signedness == signed && a < 0`
181			`if negative {`
182			`a = -a`
183			`}`
184
185			`// two ways to ask for extra leading zero digits: %.3d or %03d.`
186			`// apparently the first cancels the second.`
187			`prec := 0`
188			`if f.precPresent {`
189			`prec = f.prec`
190			`f.zero = false`
191			`} else if f.zero && f.widPresent && !f.minus && f.wid > 0 {`
192			`prec = f.wid`
193			`if negative \|\| f.plus \|\| f.space {`
194			`prec-- // leave room for sign`
195			`}`
196			`}`
197
198			`// format a into buf, ending at buf[i]. (printing is easier right-to-left.)`
199			`// a is made into unsigned ua. we could make things`
200			`// marginally faster by splitting the 32-bit case out into a separate`
201			`// block but it's not worth the duplication, so ua has 64 bits.`
202			`i := len(f.intbuf)`
203			`ua := uint64(a)`
204			`for ua >= base {`
205			`i--`
206			`buf[i] = digits[ua%base]`
207			`ua /= base`
208			`}`
209			`i--`
210			`buf[i] = digits[ua]`
211			`for i > 0 && prec > nByte-i {`
212			`i--`
213			`buf[i] = '0'`
214			`}`
215
216			`// Various prefixes: 0x, -, etc.`
217			`if f.sharp {`
218			`switch base {`
219			`case 8:`
220			`if buf[i] != '0' {`
221			`i--`
222			`buf[i] = '0'`
223			`}`
224			`case 16:`
225			`i--`
226			`buf[i] = 'x' + digits[10] - 'a'`
227			`i--`
228			`buf[i] = '0'`
229			`}`
230			`}`
231			`if f.unicode {`
232			`i--`
233			`buf[i] = '+'`
234			`i--`
235			`buf[i] = 'U'`
236			`}`
237
238			`if negative {`
239			`i--`
240			`buf[i] = '-'`
241			`} else if f.plus {`
242			`i--`
243			`buf[i] = '+'`
244			`} else if f.space {`
245			`i--`
246			`buf[i] = ' '`
247			`}`
248
249			`// If we want a quoted char for %#U, move the data up to make room.`
250			`if f.unicode && f.uniQuote && a >= 0 && a <= unicode.MaxRune && unicode.IsPrint(rune(a)) {`
251			`runeWidth := utf8.RuneLen(rune(a))`
252			`width := 1 + 1 + runeWidth + 1 // space, quote, rune, quote`
253			`copy(buf[i-width:], buf[i:]) // guaranteed to have enough room.`
254			`i -= width`
255			`// Now put " 'x'" at the end.`
256			`j := len(buf) - width`
257			`buf[j] = ' '`
258			`j++`
259			`buf[j] = '\''`
260			`j++`
261			`utf8.EncodeRune(buf[j:], rune(a))`
262			`j += runeWidth`
263			`buf[j] = '\''`
264			`}`
265
266			`f.pad(buf[i:])`
267			`}`
268
269			`// truncate truncates the string to the specified precision, if present.`
270			`func (f *fmt) truncate(s string) string {`
271			`if f.precPresent && f.prec < utf8.RuneCountInString(s) {`
272			`n := f.prec`
273			`for i := range s {`
274			`if n == 0 {`
275			`s = s[:i]`
276			`break`
277			`}`
278			`n--`
279			`}`
280			`}`
281			`return s`
282			`}`
283
284			`// fmt_s formats a string.`
285			`func (f *fmt) fmt_s(s string) {`
286			`s = f.truncate(s)`
287			`f.padString(s)`
288			`}`
289
290			`// fmt_sx formats a string as a hexadecimal encoding of its bytes.`
291			`func (f *fmt) fmt_sx(s, digits string) {`
292			`// TODO: Avoid buffer by pre-padding.`
293			`var b bytes.Buffer`
294			`for i := 0; i < len(s); i++ {`
295			`if i > 0 && f.space {`
296			`b.WriteByte(' ')`
297			`}`
298			`v := s[i]`
299			`b.WriteByte(digits[v>>4])`
300			`b.WriteByte(digits[v&0xF])`
301			`}`
302			`f.pad(b.Bytes())`
303			`}`
304
305			`// fmt_q formats a string as a double-quoted, escaped Go string constant.`
306			`func (f *fmt) fmt_q(s string) {`
307			`s = f.truncate(s)`
308			`var quoted string`
309			`if f.sharp && strconv.CanBackquote(s) {`
310			quoted = "`" + s + "`"
311			`} else {`
312			`if f.plus {`
313			`quoted = strconv.QuoteToASCII(s)`
314			`} else {`
315			`quoted = strconv.Quote(s)`
316			`}`
317			`}`
318			`f.padString(quoted)`
319			`}`
320
321			`// fmt_qc formats the integer as a single-quoted, escaped Go character constant.`
322			`// If the character is not valid Unicode, it will print '\ufffd'.`
323			`func (f *fmt) fmt_qc(c int64) {`
324			`var quoted []byte`
325			`if f.plus {`
326			`quoted = strconv.AppendQuoteRuneToASCII(f.intbuf[0:0], rune(c))`
327			`} else {`
328			`quoted = strconv.AppendQuoteRune(f.intbuf[0:0], rune(c))`
329			`}`
330			`f.pad(quoted)`
331			`}`
332
333			`// floating-point`
334
335			`func doPrec(f *fmt, def int) int {`
336			`if f.precPresent {`
337			`return f.prec`
338			`}`
339			`return def`
340			`}`
341
342			`// formatFloat formats a float64; it is an efficient equivalent to f.pad(strconv.FormatFloat()...).`
343			`func (f *fmt) formatFloat(v float64, verb byte, prec, n int) {`
344			`// We leave one byte at the beginning of f.intbuf for a sign if needed,`
345			`// and make it a space, which we might be able to use.`
346			`f.intbuf[0] = ' '`
347			`slice := strconv.AppendFloat(f.intbuf[0:1], v, verb, prec, n)`
348			`// Add a plus sign or space to the floating-point string representation if missing and required.`
349			`// The formatted number starts at slice[1].`
350			`switch slice[1] {`
351			`case '-', '+':`
352			`// We're set; drop the leading space.`
353			`slice = slice[1:]`
354			`default:`
355			`// There's no sign, but we might need one.`
356			`if f.plus {`
357			`slice[0] = '+'`
358			`} else if f.space {`
359			`// space is already there`
360			`} else {`
361			`slice = slice[1:]`
362			`}`
363			`}`
364			`f.pad(slice)`
365			`}`
366
367			`// fmt_e64 formats a float64 in the form -1.23e+12.`
368			`func (f *fmt) fmt_e64(v float64) { f.formatFloat(v, 'e', doPrec(f, 6), 64) }`
369
370			`// fmt_E64 formats a float64 in the form -1.23E+12.`
371			`func (f *fmt) fmt_E64(v float64) { f.formatFloat(v, 'E', doPrec(f, 6), 64) }`
372
373			`// fmt_f64 formats a float64 in the form -1.23.`
374			`func (f *fmt) fmt_f64(v float64) { f.formatFloat(v, 'f', doPrec(f, 6), 64) }`
375
376			`// fmt_g64 formats a float64 in the 'f' or 'e' form according to size.`
377			`func (f *fmt) fmt_g64(v float64) { f.formatFloat(v, 'g', doPrec(f, -1), 64) }`
378
379			`// fmt_g64 formats a float64 in the 'f' or 'E' form according to size.`
380			`func (f *fmt) fmt_G64(v float64) { f.formatFloat(v, 'G', doPrec(f, -1), 64) }`
381
382			`// fmt_fb64 formats a float64 in the form -123p3 (exponent is power of 2).`
383			`func (f *fmt) fmt_fb64(v float64) { f.formatFloat(v, 'b', 0, 64) }`
384
385			`// float32`
386			`// cannot defer to float64 versions`
387			`// because it will get rounding wrong in corner cases.`
388
389			`// fmt_e32 formats a float32 in the form -1.23e+12.`
390			`func (f *fmt) fmt_e32(v float32) { f.formatFloat(float64(v), 'e', doPrec(f, 6), 32) }`
391
392			`// fmt_E32 formats a float32 in the form -1.23E+12.`
393			`func (f *fmt) fmt_E32(v float32) { f.formatFloat(float64(v), 'E', doPrec(f, 6), 32) }`
394
395			`// fmt_f32 formats a float32 in the form -1.23.`
396			`func (f *fmt) fmt_f32(v float32) { f.formatFloat(float64(v), 'f', doPrec(f, 6), 32) }`
397
398			`// fmt_g32 formats a float32 in the 'f' or 'e' form according to size.`
399			`func (f *fmt) fmt_g32(v float32) { f.formatFloat(float64(v), 'g', doPrec(f, -1), 32) }`
400
401			`// fmt_G32 formats a float32 in the 'f' or 'E' form according to size.`
402			`func (f *fmt) fmt_G32(v float32) { f.formatFloat(float64(v), 'G', doPrec(f, -1), 32) }`
403
404			`// fmt_fb32 formats a float32 in the form -123p3 (exponent is power of 2).`
405			`func (f *fmt) fmt_fb32(v float32) { f.formatFloat(float64(v), 'b', 0, 32) }`
406
407			`// fmt_c64 formats a complex64 according to the verb.`
408			`func (f *fmt) fmt_c64(v complex64, verb rune) {`
409			`f.buf.WriteByte('(')`
410			`r := real(v)`
411			`for i := 0; ; i++ {`
412			`switch verb {`
413			`case 'e':`
414			`f.fmt_e32(r)`
415			`case 'E':`
416			`f.fmt_E32(r)`
417			`case 'f':`
418			`f.fmt_f32(r)`
419			`case 'g':`
420			`f.fmt_g32(r)`
421			`case 'G':`
422			`f.fmt_G32(r)`
423			`}`
424			`if i != 0 {`
425			`break`
426			`}`
427			`f.plus = true`
428			`r = imag(v)`
429			`}`
430			`f.buf.Write(irparenBytes)`
431			`}`
432
433			`// fmt_c128 formats a complex128 according to the verb.`
434			`func (f *fmt) fmt_c128(v complex128, verb rune) {`
435			`f.buf.WriteByte('(')`
436			`r := real(v)`
437			`for i := 0; ; i++ {`
438			`switch verb {`
439			`case 'e':`
440			`f.fmt_e64(r)`
441			`case 'E':`
442			`f.fmt_E64(r)`
443			`case 'f':`
444			`f.fmt_f64(r)`
445			`case 'g':`
446			`f.fmt_g64(r)`
447			`case 'G':`
448			`f.fmt_G64(r)`
449			`}`
450			`if i != 0 {`
451			`break`
452			`}`
453			`f.plus = true`
454			`r = imag(v)`
455			`}`
456			`f.buf.Write(irparenBytes)`
457			`}`