mirror of
https://github.com/golang/go
synced 2024-11-19 06:54:39 -07:00
fmt: unify integer formatting
Deduplicate the verb switch for signed and unsigned integer formatting. Make names of integer related functions consistent with names of other fmt functions. Consolidate basic integer tests. Change-Id: I0c19c24f1c2c06a3b1a4d7d377dcdac3b36bb0f5 Reviewed-on: https://go-review.googlesource.com/20831 Run-TryBot: Rob Pike <r@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Rob Pike <r@golang.org>
This commit is contained in:
Martin Möhrmann
Rob Pike
parent
3eaa304629
commit
8d9ece9dde
@ -48,11 +48,6 @@ func TestFmtInterface(t *testing.T) {
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}
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}
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const (
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b32 uint32 = 1<<32 - 1
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b64 uint64 = 1<<64 - 1
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)
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var (
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NaN = math.NaN()
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posInf = math.Inf(1)
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@ -319,23 +314,47 @@ var fmtTests = []struct {
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{"%-10v", nil, "<nil> "},
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// integers
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{"%d", 12345, "12345"},
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{"%d", -12345, "-12345"},
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{"%d", uint(12345), "12345"},
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{"%d", int(-12345), "-12345"},
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{"%d", ^uint8(0), "255"},
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{"%d", ^uint16(0), "65535"},
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{"%d", ^uint32(0), "4294967295"},
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{"%d", ^uint64(0), "18446744073709551615"},
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{"%d", int8(-1 << 7), "-128"},
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{"%d", int16(-1 << 15), "-32768"},
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{"%d", int32(-1 << 31), "-2147483648"},
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{"%d", int64(-1 << 63), "-9223372036854775808"},
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{"%.d", 0, ""},
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{"%.0d", 0, ""},
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{"% d", 12345, " 12345"},
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{"%+d", 12345, "+12345"},
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{"%+d", -12345, "-12345"},
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{"%b", 7, "111"},
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{"%b", -6, "-110"},
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{"%b", ^uint32(0), "11111111111111111111111111111111"},
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{"%b", ^uint64(0), "1111111111111111111111111111111111111111111111111111111111111111"},
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{"%o", 01234, "1234"},
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{"%#o", 01234, "01234"},
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{"%o", ^uint32(0), "37777777777"},
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{"%o", ^uint64(0), "1777777777777777777777"},
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{"%#X", 0, "0X0"},
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{"%x", 0x12abcdef, "12abcdef"},
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{"%X", 0x12abcdef, "12ABCDEF"},
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{"%x", ^uint32(0), "ffffffff"},
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{"%X", ^uint64(0), "FFFFFFFFFFFFFFFF"},
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{"%.20b", 7, "00000000000000000111"},
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{"%10d", 12345, " 12345"},
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{"%10d", -12345, " -12345"},
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{"%+10d", 12345, " +12345"},
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{"%010d", 12345, "0000012345"},
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{"%010d", -12345, "-000012345"},
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{"%-10d", 12345, "12345 "},
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{"%010.3d", 1, " 001"},
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{"%010.3d", -1, " -001"},
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{"%+d", 12345, "+12345"},
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{"%+d", -12345, "-12345"},
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{"%+d", 0, "+0"},
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{"% d", 0, " 0"},
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{"% d", 12345, " 12345"},
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{"%.0d", 0, ""},
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{"%.d", 0, ""},
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{"%20.8d", 1234, " 00001234"},
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{"%20.8d", -1234, " -00001234"},
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{"%-20.8d", 1234, "00001234 "},
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{"%-20.8d", -1234, "-00001234 "},
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{"%-#20.8x", 0x1234abc, "0x01234abc "},
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{"%-#20.8X", 0x1234abc, "0X01234ABC "},
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{"%-#20.8o", 01234, "00001234 "},
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// unicode format
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{"%U", 0, "U+0000"},
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@ -453,25 +472,6 @@ var fmtTests = []struct {
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{"%-08G", complex(NaN, NaN), "(NaN +NaN i)"},
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// old test/fmt_test.go
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{"%d", 1234, "1234"},
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{"%d", -1234, "-1234"},
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{"%d", uint(1234), "1234"},
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{"%d", uint32(b32), "4294967295"},
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{"%d", uint64(b64), "18446744073709551615"},
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{"%o", 01234, "1234"},
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{"%#o", 01234, "01234"},
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{"%o", uint32(b32), "37777777777"},
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{"%o", uint64(b64), "1777777777777777777777"},
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{"%x", 0x1234abcd, "1234abcd"},
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{"%#x", 0x1234abcd, "0x1234abcd"},
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{"%x", b32 - 0x1234567, "fedcba98"},
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{"%X", 0x1234abcd, "1234ABCD"},
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{"%X", b32 - 0x1234567, "FEDCBA98"},
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{"%#X", 0, "0X0"},
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{"%x", b64, "ffffffffffffffff"},
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{"%b", 7, "111"},
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{"%b", b64, "1111111111111111111111111111111111111111111111111111111111111111"},
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{"%b", -6, "-110"},
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{"%e", 1.0, "1.000000e+00"},
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{"%e", 1234.5678e3, "1.234568e+06"},
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{"%e", 1234.5678e-8, "1.234568e-05"},
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@ -498,15 +498,6 @@ var fmtTests = []struct {
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{"%G", -7.0, "-7"},
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{"%G", -1e-9, "-1E-09"},
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{"%G", float32(-1e-9), "-1E-09"},
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{"%20.8d", 1234, " 00001234"},
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{"%20.8d", -1234, " -00001234"},
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{"%20d", 1234, " 1234"},
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{"%-20.8d", 1234, "00001234 "},
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{"%-20.8d", -1234, "-00001234 "},
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{"%-#20.8x", 0x1234abc, "0x01234abc "},
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{"%-#20.8X", 0x1234abc, "0X01234ABC "},
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{"%-#20.8o", 01234, "00001234 "},
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{"%.20b", 7, "00000000000000000111"},
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{"%20.5s", "qwertyuiop", " qwert"},
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{"%.5s", "qwertyuiop", "qwert"},
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{"%-20.5s", "qwertyuiop", "qwert "},
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@ -822,11 +813,11 @@ var fmtTests = []struct {
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{"%0.100f", -1.0, zeroFill("-1.", 100, "")},
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// Used to panic: integer function didn't look at f.prec, f.unicode, f.width or sign.
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{"%#.80x", 42, "0x0000000000000000000000000000000000000000000000000000000000000000000000000000002a"},
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{"%.65d", -44, "-00000000000000000000000000000000000000000000000000000000000000044"},
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{"%+.65d", 44, "+00000000000000000000000000000000000000000000000000000000000000044"},
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{"% .65d", 44, " 00000000000000000000000000000000000000000000000000000000000000044"},
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{"% +.65d", 44, "+00000000000000000000000000000000000000000000000000000000000000044"},
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{"%#.65x", 42, zeroFill("0x", 65, "2a")},
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{"%.65d", -42, zeroFill("-", 65, "42")},
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{"%+.65d", 42, zeroFill("+", 65, "42")},
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{"% .65d", 42, zeroFill(" ", 65, "42")},
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{"% +.65d", 42, zeroFill("+", 65, "42")},
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// Comparison of padding rules with C printf.
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/*
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@ -190,17 +190,16 @@ func (f *fmt) fmt_unicode(u uint64) {
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f.zero = oldZero
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}
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// integer; interprets prec but not wid. Once formatted, result is sent to pad()
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// and then flags are cleared.
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func (f *fmt) integer(a int64, base uint64, signedness bool, digits string) {
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// fmt_integer formats signed and unsigned integers.
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func (f *fmt) fmt_integer(u uint64, base int, isSigned bool, digits string) {
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// precision of 0 and value of 0 means "print nothing"
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if f.precPresent && f.prec == 0 && a == 0 {
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if f.precPresent && f.prec == 0 && u == 0 {
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return
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}
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negative := signedness == signed && a < 0
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negative := isSigned && int64(u) < 0
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if negative {
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a = -a
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u = -u
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}
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var buf []byte = f.intbuf[0:]
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@ -233,45 +232,43 @@ func (f *fmt) integer(a int64, base uint64, signedness bool, digits string) {
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}
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}
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// format a into buf, ending at buf[i]. (printing is easier right-to-left.)
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// a is made into unsigned ua. we could make things
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// marginally faster by splitting the 32-bit case out into a separate
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// block but it's not worth the duplication, so ua has 64 bits.
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// Because printing is easier right-to-left: format u into buf, ending at buf[i].
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// We could make things marginally faster by splitting the 32-bit case out
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// into a separate block but it's not worth the duplication, so u has 64 bits.
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i := len(buf)
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ua := uint64(a)
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// use constants for the division and modulo for more efficient code.
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// switch cases ordered by popularity.
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// Use constants for the division and modulo for more efficient code.
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// Switch cases ordered by popularity.
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switch base {
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case 10:
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for ua >= 10 {
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for u >= 10 {
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i--
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next := ua / 10
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buf[i] = byte('0' + ua - next*10)
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ua = next
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next := u / 10
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buf[i] = byte('0' + u - next*10)
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u = next
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}
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case 16:
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for ua >= 16 {
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for u >= 16 {
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i--
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buf[i] = digits[ua&0xF]
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ua >>= 4
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buf[i] = digits[u&0xF]
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u >>= 4
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}
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case 8:
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for ua >= 8 {
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for u >= 8 {
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i--
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buf[i] = byte('0' + ua&7)
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ua >>= 3
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buf[i] = byte('0' + u&7)
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u >>= 3
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}
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case 2:
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for ua >= 2 {
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for u >= 2 {
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i--
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buf[i] = byte('0' + ua&1)
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ua >>= 1
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buf[i] = byte('0' + u&1)
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u >>= 1
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}
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default:
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panic("fmt: unknown base; can't happen")
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}
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i--
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buf[i] = digits[ua]
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buf[i] = digits[u]
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for i > 0 && prec > len(buf)-i {
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i--
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buf[i] = '0'
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@ -338,68 +338,42 @@ func (p *pp) fmtBool(v bool, verb rune) {
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}
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}
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func (p *pp) fmtInt64(v int64, verb rune) {
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switch verb {
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case 'b':
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p.fmt.integer(v, 2, signed, ldigits)
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case 'c':
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p.fmt.fmt_c(uint64(v))
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case 'd', 'v':
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p.fmt.integer(v, 10, signed, ldigits)
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case 'o':
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p.fmt.integer(v, 8, signed, ldigits)
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case 'q':
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if 0 <= v && v <= utf8.MaxRune {
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p.fmt.fmt_qc(uint64(v))
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} else {
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p.badVerb(verb)
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}
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case 'x':
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p.fmt.integer(v, 16, signed, ldigits)
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case 'U':
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p.fmt.fmt_unicode(uint64(v))
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case 'X':
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p.fmt.integer(v, 16, signed, udigits)
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default:
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p.badVerb(verb)
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}
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}
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// fmt0x64 formats a uint64 in hexadecimal and prefixes it with 0x or
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// not, as requested, by temporarily setting the sharp flag.
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func (p *pp) fmt0x64(v uint64, leading0x bool) {
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sharp := p.fmt.sharp
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p.fmt.sharp = leading0x
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p.fmt.integer(int64(v), 16, unsigned, ldigits)
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p.fmt.fmt_integer(v, 16, unsigned, ldigits)
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p.fmt.sharp = sharp
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}
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func (p *pp) fmtUint64(v uint64, verb rune) {
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// fmtInteger formats a signed or unsigned integer.
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func (p *pp) fmtInteger(v uint64, isSigned bool, verb rune) {
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switch verb {
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case 'b':
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p.fmt.integer(int64(v), 2, unsigned, ldigits)
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case 'c':
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p.fmt.fmt_c(v)
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case 'd':
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p.fmt.integer(int64(v), 10, unsigned, ldigits)
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case 'v':
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if p.fmt.sharpV {
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if p.fmt.sharpV && !isSigned {
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p.fmt0x64(v, true)
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} else {
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p.fmt.integer(int64(v), 10, unsigned, ldigits)
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p.fmt.fmt_integer(v, 10, isSigned, ldigits)
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}
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case 'd':
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p.fmt.fmt_integer(v, 10, isSigned, ldigits)
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case 'b':
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p.fmt.fmt_integer(v, 2, isSigned, ldigits)
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case 'o':
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p.fmt.integer(int64(v), 8, unsigned, ldigits)
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p.fmt.fmt_integer(v, 8, isSigned, ldigits)
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case 'x':
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p.fmt.fmt_integer(v, 16, isSigned, ldigits)
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case 'X':
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p.fmt.fmt_integer(v, 16, isSigned, udigits)
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case 'c':
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p.fmt.fmt_c(v)
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case 'q':
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if 0 <= v && v <= utf8.MaxRune {
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if v <= utf8.MaxRune {
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p.fmt.fmt_qc(v)
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} else {
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p.badVerb(verb)
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}
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case 'x':
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p.fmt.integer(int64(v), 16, unsigned, ldigits)
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case 'X':
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p.fmt.integer(int64(v), 16, unsigned, udigits)
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case 'U':
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p.fmt.fmt_unicode(v)
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default:
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@ -489,7 +463,7 @@ func (p *pp) fmtBytes(v []byte, verb rune, typeString string) {
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if i > 0 {
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p.buf.WriteByte(' ')
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}
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p.fmt.integer(int64(c), 10, unsigned, ldigits)
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p.fmt.fmt_integer(uint64(c), 10, unsigned, ldigits)
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}
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p.buf.WriteByte(']')
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}
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@ -538,7 +512,7 @@ func (p *pp) fmtPointer(value reflect.Value, verb rune) {
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case 'p':
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p.fmt0x64(uint64(u), !p.fmt.sharp)
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case 'b', 'o', 'd', 'x', 'X':
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p.fmtUint64(uint64(u), verb)
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p.fmtInteger(uint64(u), unsigned, verb)
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default:
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p.badVerb(verb)
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}
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@ -657,27 +631,27 @@ func (p *pp) printArg(arg interface{}, verb rune) {
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case complex128:
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p.fmtComplex(f, 128, verb)
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case int:
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p.fmtInt64(int64(f), verb)
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p.fmtInteger(uint64(f), signed, verb)
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case int8:
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p.fmtInt64(int64(f), verb)
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p.fmtInteger(uint64(f), signed, verb)
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case int16:
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p.fmtInt64(int64(f), verb)
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p.fmtInteger(uint64(f), signed, verb)
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case int32:
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p.fmtInt64(int64(f), verb)
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p.fmtInteger(uint64(f), signed, verb)
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case int64:
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p.fmtInt64(f, verb)
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p.fmtInteger(uint64(f), signed, verb)
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case uint:
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p.fmtUint64(uint64(f), verb)
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p.fmtInteger(uint64(f), unsigned, verb)
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case uint8:
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p.fmtUint64(uint64(f), verb)
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p.fmtInteger(uint64(f), unsigned, verb)
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case uint16:
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p.fmtUint64(uint64(f), verb)
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p.fmtInteger(uint64(f), unsigned, verb)
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case uint32:
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p.fmtUint64(uint64(f), verb)
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p.fmtInteger(uint64(f), unsigned, verb)
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case uint64:
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p.fmtUint64(f, verb)
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p.fmtInteger(f, unsigned, verb)
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case uintptr:
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p.fmtUint64(uint64(f), verb)
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p.fmtInteger(uint64(f), unsigned, verb)
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case string:
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p.fmtString(f, verb)
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case []byte:
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@ -737,9 +711,9 @@ BigSwitch:
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case reflect.Bool:
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p.fmtBool(f.Bool(), verb)
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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p.fmtInt64(f.Int(), verb)
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p.fmtInteger(uint64(f.Int()), signed, verb)
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case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
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p.fmtUint64(f.Uint(), verb)
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p.fmtInteger(f.Uint(), unsigned, verb)
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case reflect.Float32:
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p.fmtFloat(f.Float(), 32, verb)
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case reflect.Float64:
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