mirror of
https://github.com/golang/go
synced 2024-11-21 14:54:40 -07:00
fmt.Printf: fix bug in handling of %#v.
nice side effect: slices now obey their format verb. example:
fmt.Printf("%q\n", []string{"a"})
R=rsc
CC=golang-dev
https://golang.org/cl/1729045
This commit is contained in:
Rob Pike
parent
a26ab29ab8
commit
5245ea771d
@ -289,6 +289,14 @@ var fmttests = []fmtTest{
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fmtTest{"%#v", make(chan int), "(chan int)(PTR)"},
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fmtTest{"%#v", uint64(1<<64 - 1), "0xffffffffffffffff"},
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fmtTest{"%#v", 1000000000, "1000000000"},
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fmtTest{"%#v", map[string]int{"a": 1, "b": 2}, `map[string] int{"a":1, "b":2}`},
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fmtTest{"%#v", map[string]B{"a": B{1, 2}, "b": B{3, 4}}, `map[string] fmt_test.B{"a":fmt_test.B{i:1, j:2}, "b":fmt_test.B{i:3, j:4}}`},
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fmtTest{"%#v", []string{"a", "b"}, `[]string{"a", "b"}`},
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// slices with other formats
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fmtTest{"%#x", []int{1, 2, 15}, `[0x1 0x2 0xf]`},
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fmtTest{"%x", []int{1, 2, 15}, `[1 2 f]`},
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fmtTest{"%q", []string{"a", "b"}, `["a" "b"]`},
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// renamings
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fmtTest{"%v", renamedBool(true), "true"},
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@ -43,14 +43,13 @@ type fmt struct {
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wid int
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prec int
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// flags
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widPresent bool
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precPresent bool
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minus bool
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plus bool
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sharp bool
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space bool
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zero bool
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preserveFlags bool // don't clear flags after this print; used to carry over in complex prints
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widPresent bool
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precPresent bool
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minus bool
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plus bool
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sharp bool
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space bool
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zero bool
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}
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func (f *fmt) clearflags() {
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@ -120,9 +119,6 @@ func (f *fmt) pad(b []byte) {
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if right > 0 {
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f.writePadding(right, padding)
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}
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if !f.preserveFlags {
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f.clearflags()
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}
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}
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// append s to buf, padded on left (w > 0) or right (w < 0 or f.minus).
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@ -140,9 +136,6 @@ func (f *fmt) padString(s string) {
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if right > 0 {
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f.writePadding(right, padding)
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}
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if !f.preserveFlags {
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f.clearflags()
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}
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}
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func putint(buf []byte, base, val uint64, digits string) int {
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@ -345,7 +338,6 @@ func (f *fmt) fmt_fb32(v float32) { f.padString(strconv.Ftoa32(v, 'b', 0)) }
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func (f *fmt) fmt_c64(v complex64, verb int) {
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f.buf.WriteByte('(')
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r := real(v)
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f.preserveFlags = true
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for i := 0; ; i++ {
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switch verb {
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case 'e':
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@ -359,7 +351,6 @@ func (f *fmt) fmt_c64(v complex64, verb int) {
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case 'G':
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f.fmt_G32(r)
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}
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f.preserveFlags = false
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if i != 0 {
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break
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}
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@ -373,7 +364,6 @@ func (f *fmt) fmt_c64(v complex64, verb int) {
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func (f *fmt) fmt_c128(v complex128, verb int) {
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f.buf.WriteByte('(')
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r := real(v)
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f.preserveFlags = true
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for i := 0; ; i++ {
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switch verb {
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case 'e':
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@ -387,7 +377,6 @@ func (f *fmt) fmt_c128(v complex128, verb int) {
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case 'G':
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f.fmt_G64(r)
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}
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f.preserveFlags = false
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if i != 0 {
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break
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}
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@ -443,7 +443,7 @@ func (p *pp) fmt0x64(v uint64) {
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p.fmt.sharp = sharp
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}
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func (p *pp) fmtUint64(v uint64, verb int, sharp bool, value interface{}) {
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func (p *pp) fmtUint64(v uint64, verb int, goSyntax bool, value interface{}) {
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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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@ -452,7 +452,7 @@ func (p *pp) fmtUint64(v uint64, verb int, sharp bool, value interface{}) {
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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 sharp {
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if goSyntax {
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p.fmt0x64(v)
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} else {
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p.fmt.integer(int64(v), 10, unsigned, ldigits)
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@ -528,10 +528,10 @@ func (p *pp) fmtComplex128(v complex128, verb int, value interface{}) {
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}
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}
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func (p *pp) fmtString(v string, verb int, sharp bool, value interface{}) {
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func (p *pp) fmtString(v string, verb int, goSyntax bool, value interface{}) {
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switch verb {
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case 'v':
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if sharp {
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if goSyntax {
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p.fmt.fmt_q(v)
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} else {
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p.fmt.fmt_s(v)
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@ -549,24 +549,24 @@ func (p *pp) fmtString(v string, verb int, sharp bool, value interface{}) {
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}
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}
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func (p *pp) fmtBytes(v []byte, verb int, sharp bool, depth int, value interface{}) {
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func (p *pp) fmtBytes(v []byte, verb int, goSyntax bool, depth int, value interface{}) {
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if verb == 'v' {
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if p.fmt.sharp {
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if goSyntax {
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p.buf.Write(bytesBytes)
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} else {
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p.buf.WriteByte('[')
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}
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for i, c := range v {
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if i > 0 {
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if p.fmt.sharp {
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if goSyntax {
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p.buf.Write(commaSpaceBytes)
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} else {
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p.buf.WriteByte(' ')
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}
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}
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p.printField(c, 'v', p.fmt.plus, p.fmt.sharp, depth+1)
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p.printField(c, 'v', p.fmt.plus, goSyntax, depth+1)
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}
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if sharp {
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if goSyntax {
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p.buf.WriteByte('}')
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} else {
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p.buf.WriteByte(']')
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@ -618,17 +618,17 @@ var (
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uintptrBits = reflect.Typeof(uintptr(0)).Bits()
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)
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func (p *pp) printField(field interface{}, verb int, plus, sharp bool, depth int) (was_string bool) {
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func (p *pp) printField(field interface{}, verb int, plus, goSyntax bool, depth int) (was_string bool) {
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if field != nil {
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switch {
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default:
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if stringer, ok := field.(Stringer); ok {
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p.printField(stringer.String(), verb, plus, sharp, depth)
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p.printField(stringer.String(), verb, plus, goSyntax, depth)
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return false // this value is not a string
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}
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case sharp:
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case goSyntax:
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if stringer, ok := field.(GoStringer); ok {
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p.printField(stringer.GoString(), verb, plus, sharp, depth)
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p.printField(stringer.GoString(), verb, plus, goSyntax, depth)
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return false // this value is not a string
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}
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}
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@ -681,28 +681,28 @@ func (p *pp) printField(field interface{}, verb int, plus, sharp bool, depth int
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p.fmtInt64(f, verb, field)
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return false
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case uint:
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p.fmtUint64(uint64(f), verb, sharp, field)
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p.fmtUint64(uint64(f), verb, goSyntax, field)
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return false
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case uint8:
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p.fmtUint64(uint64(f), verb, sharp, field)
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p.fmtUint64(uint64(f), verb, goSyntax, field)
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return false
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case uint16:
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p.fmtUint64(uint64(f), verb, sharp, field)
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p.fmtUint64(uint64(f), verb, goSyntax, field)
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return false
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case uint32:
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p.fmtUint64(uint64(f), verb, sharp, field)
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p.fmtUint64(uint64(f), verb, goSyntax, field)
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return false
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case uint64:
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p.fmtUint64(f, verb, sharp, field)
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p.fmtUint64(f, verb, goSyntax, field)
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return false
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case uintptr:
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p.fmtUint64(uint64(f), verb, sharp, field)
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p.fmtUint64(uint64(f), verb, goSyntax, field)
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return false
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case string:
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p.fmtString(f, verb, sharp, field)
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p.fmtString(f, verb, goSyntax, field)
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return verb == 's' || verb == 'v'
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case []byte:
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p.fmtBytes(f, verb, sharp, depth, field)
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p.fmtBytes(f, verb, goSyntax, depth, field)
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return verb == 's'
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}
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@ -718,7 +718,7 @@ func (p *pp) printField(field interface{}, verb int, plus, sharp bool, depth int
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value := reflect.NewValue(field)
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// Need to use reflection
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// Special case for reflection values that know how to print with %p.
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if verb == 'p' && p.fmtUintptrGetter(field, value, verb, sharp) {
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if verb == 'p' && p.fmtUintptrGetter(field, value, verb, goSyntax) { // TODO: is this goSyntax right?
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return false
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}
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@ -729,7 +729,7 @@ BigSwitch:
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case *reflect.IntValue:
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p.fmtInt64(f.Get(), verb, field)
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case *reflect.UintValue:
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p.fmtUint64(uint64(f.Get()), verb, sharp, field)
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p.fmtUint64(uint64(f.Get()), verb, goSyntax, field)
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case *reflect.FloatValue:
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if f.Type().Size() == 4 {
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p.fmtFloat32(float32(f.Get()), verb, field)
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@ -743,9 +743,9 @@ BigSwitch:
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p.fmtComplex128(complex128(f.Get()), verb, field)
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}
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case *reflect.StringValue:
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p.fmtString(f.Get(), verb, sharp, field)
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p.fmtString(f.Get(), verb, goSyntax, field)
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case *reflect.MapValue:
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if sharp {
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if goSyntax {
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p.buf.WriteString(f.Type().String())
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p.buf.WriteByte('{')
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} else {
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@ -754,60 +754,59 @@ BigSwitch:
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keys := f.Keys()
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for i, key := range keys {
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if i > 0 {
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if sharp {
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if goSyntax {
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p.buf.Write(commaSpaceBytes)
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} else {
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p.buf.WriteByte(' ')
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}
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}
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p.printField(key.Interface(), verb, plus, sharp, depth+1)
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p.printField(key.Interface(), verb, plus, goSyntax, depth+1)
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p.buf.WriteByte(':')
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p.printField(f.Elem(key).Interface(), verb, plus, sharp, depth+1)
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p.printField(f.Elem(key).Interface(), verb, plus, goSyntax, depth+1)
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}
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if sharp {
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if goSyntax {
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p.buf.WriteByte('}')
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} else {
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p.buf.WriteByte(']')
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}
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case *reflect.StructValue:
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if sharp {
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if goSyntax {
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p.buf.WriteString(reflect.Typeof(field).String())
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}
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p.add('{')
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v := f
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t := v.Type().(*reflect.StructType)
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p.fmt.clearflags() // clear flags for p.printField
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for i := 0; i < v.NumField(); i++ {
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if i > 0 {
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if sharp {
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if goSyntax {
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p.buf.Write(commaSpaceBytes)
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} else {
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p.buf.WriteByte(' ')
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}
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}
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if plus || sharp {
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if plus || goSyntax {
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if f := t.Field(i); f.Name != "" {
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p.buf.WriteString(f.Name)
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p.buf.WriteByte(':')
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}
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}
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p.printField(getField(v, i).Interface(), verb, plus, sharp, depth+1)
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p.printField(getField(v, i).Interface(), verb, plus, goSyntax, depth+1)
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}
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p.buf.WriteByte('}')
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case *reflect.InterfaceValue:
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value := f.Elem()
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if value == nil {
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if sharp {
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if goSyntax {
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p.buf.WriteString(reflect.Typeof(field).String())
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p.buf.Write(nilParenBytes)
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} else {
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p.buf.Write(nilAngleBytes)
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}
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} else {
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return p.printField(value.Interface(), verb, plus, sharp, depth+1)
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return p.printField(value.Interface(), verb, plus, goSyntax, depth+1)
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}
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case reflect.ArrayOrSliceValue:
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if sharp {
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if goSyntax {
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p.buf.WriteString(reflect.Typeof(field).String())
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p.buf.WriteByte('{')
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} else {
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@ -815,15 +814,15 @@ BigSwitch:
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}
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for i := 0; i < f.Len(); i++ {
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if i > 0 {
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if sharp {
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if goSyntax {
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p.buf.Write(commaSpaceBytes)
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} else {
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p.buf.WriteByte(' ')
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}
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}
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p.printField(f.Elem(i).Interface(), verb, plus, sharp, depth+1)
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p.printField(f.Elem(i).Interface(), verb, plus, goSyntax, depth+1)
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}
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if sharp {
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if goSyntax {
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p.buf.WriteByte('}')
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} else {
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p.buf.WriteByte(']')
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@ -836,15 +835,15 @@ BigSwitch:
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switch a := f.Elem().(type) {
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case reflect.ArrayOrSliceValue:
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p.buf.WriteByte('&')
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p.printField(a.Interface(), verb, plus, sharp, depth+1)
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p.printField(a.Interface(), verb, plus, goSyntax, depth+1)
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break BigSwitch
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case *reflect.StructValue:
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p.buf.WriteByte('&')
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p.printField(a.Interface(), verb, plus, sharp, depth+1)
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p.printField(a.Interface(), verb, plus, goSyntax, depth+1)
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break BigSwitch
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}
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}
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if sharp {
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if goSyntax {
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p.buf.WriteByte('(')
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p.buf.WriteString(reflect.Typeof(field).String())
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p.buf.WriteByte(')')
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@ -863,7 +862,7 @@ BigSwitch:
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}
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p.fmt0x64(uint64(v))
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case uintptrGetter:
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if p.fmtUintptrGetter(field, value, verb, sharp) {
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if p.fmtUintptrGetter(field, value, verb, goSyntax) {
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break
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}
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p.unknownType(f)
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@ -948,7 +947,15 @@ func (p *pp) doPrintf(format string, a []interface{}) {
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}
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}
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p.printField(field, c, p.fmt.plus, p.fmt.sharp, 0)
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goSyntax := c == 'v' && p.fmt.sharp
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if goSyntax {
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p.fmt.sharp = false
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}
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plus := c == 'v' && p.fmt.plus
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if plus {
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p.fmt.plus = false
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}
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p.printField(field, c, plus, goSyntax, 0)
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}
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if fieldnum < len(a) {
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@ -971,6 +978,7 @@ func (p *pp) doPrintf(format string, a []interface{}) {
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func (p *pp) doPrint(a []interface{}, addspace, addnewline bool) {
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prev_string := false
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for fieldnum := 0; fieldnum < len(a); fieldnum++ {
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p.fmt.clearflags()
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// always add spaces if we're doing println
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field := a[fieldnum]
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if fieldnum > 0 {
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