mirror of
https://github.com/golang/go
synced 2024-11-20 09:44:45 -07:00
fmt: simplify the code some more by storing the field in the pp structure.
R=rsc CC=golang-dev https://golang.org/cl/5293058
This commit is contained in:
Rob Pike
parent
4854bd9ced
commit
d481d7c854
@ -74,6 +74,8 @@ type pp struct {
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n int
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panicking bool
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buf bytes.Buffer
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// field holds the current item, as an interface{}.
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field interface{}
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// value holds the current item, as a reflect.Value, and will be
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// the zero Value if the item has not been reflected.
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value reflect.Value
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@ -132,6 +134,7 @@ func (p *pp) free() {
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return
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}
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p.buf.Reset()
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p.field = nil
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p.value = reflect.Value{}
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ppFree.put(p)
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}
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@ -294,16 +297,16 @@ func (p *pp) unknownType(v interface{}) {
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p.buf.WriteByte('?')
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}
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func (p *pp) badVerb(verb int, val interface{}) {
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func (p *pp) badVerb(verb int) {
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p.add('%')
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p.add('!')
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p.add(verb)
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p.add('(')
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switch {
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case val != nil:
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p.buf.WriteString(reflect.TypeOf(val).String())
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case p.field != nil:
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p.buf.WriteString(reflect.TypeOf(p.field).String())
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p.add('=')
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p.printField(val, 'v', false, false, 0)
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p.printField(p.field, 'v', false, false, 0)
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case p.value.IsValid():
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p.buf.WriteString(p.value.Type().String())
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p.add('=')
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@ -314,12 +317,12 @@ func (p *pp) badVerb(verb int, val interface{}) {
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p.add(')')
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}
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func (p *pp) fmtBool(v bool, verb int, value interface{}) {
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func (p *pp) fmtBool(v bool, verb int) {
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switch verb {
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case 't', 'v':
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p.fmt.fmt_boolean(v)
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default:
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p.badVerb(verb, value)
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p.badVerb(verb)
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}
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}
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@ -333,7 +336,7 @@ func (p *pp) fmtC(c int64) {
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p.fmt.pad(p.runeBuf[0:w])
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}
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func (p *pp) fmtInt64(v int64, verb int, value interface{}) {
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func (p *pp) fmtInt64(v int64, verb int) {
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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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@ -347,7 +350,7 @@ func (p *pp) fmtInt64(v int64, verb int, value interface{}) {
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if 0 <= v && v <= unicode.MaxRune {
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p.fmt.fmt_qc(v)
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} else {
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p.badVerb(verb, value)
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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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@ -356,7 +359,7 @@ func (p *pp) fmtInt64(v int64, verb int, value interface{}) {
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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, value)
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p.badVerb(verb)
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}
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}
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@ -391,7 +394,7 @@ func (p *pp) fmtUnicode(v int64) {
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p.fmt.sharp = sharp
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}
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func (p *pp) fmtUint64(v uint64, verb int, goSyntax bool, value interface{}) {
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func (p *pp) fmtUint64(v uint64, verb int, goSyntax bool) {
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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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@ -411,7 +414,7 @@ func (p *pp) fmtUint64(v uint64, verb int, goSyntax bool, value interface{}) {
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if 0 <= v && v <= unicode.MaxRune {
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p.fmt.fmt_qc(int64(v))
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} else {
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p.badVerb(verb, value)
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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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@ -420,11 +423,11 @@ func (p *pp) fmtUint64(v uint64, verb int, goSyntax bool, value interface{}) {
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case 'U':
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p.fmtUnicode(int64(v))
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default:
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p.badVerb(verb, value)
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p.badVerb(verb)
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}
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}
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func (p *pp) fmtFloat32(v float32, verb int, value interface{}) {
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func (p *pp) fmtFloat32(v float32, verb int) {
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switch verb {
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case 'b':
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p.fmt.fmt_fb32(v)
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@ -439,11 +442,11 @@ func (p *pp) fmtFloat32(v float32, verb int, value interface{}) {
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case 'G':
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p.fmt.fmt_G32(v)
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default:
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p.badVerb(verb, value)
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p.badVerb(verb)
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}
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}
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func (p *pp) fmtFloat64(v float64, verb int, value interface{}) {
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func (p *pp) fmtFloat64(v float64, verb int) {
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switch verb {
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case 'b':
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p.fmt.fmt_fb64(v)
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@ -458,33 +461,33 @@ func (p *pp) fmtFloat64(v float64, verb int, value interface{}) {
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case 'G':
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p.fmt.fmt_G64(v)
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default:
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p.badVerb(verb, value)
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p.badVerb(verb)
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}
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}
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func (p *pp) fmtComplex64(v complex64, verb int, value interface{}) {
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func (p *pp) fmtComplex64(v complex64, verb int) {
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switch verb {
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case 'e', 'E', 'f', 'F', 'g', 'G':
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p.fmt.fmt_c64(v, verb)
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case 'v':
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p.fmt.fmt_c64(v, 'g')
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default:
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p.badVerb(verb, value)
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p.badVerb(verb)
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}
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}
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func (p *pp) fmtComplex128(v complex128, verb int, value interface{}) {
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func (p *pp) fmtComplex128(v complex128, verb int) {
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switch verb {
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case 'e', 'E', 'f', 'F', 'g', 'G':
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p.fmt.fmt_c128(v, verb)
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case 'v':
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p.fmt.fmt_c128(v, 'g')
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default:
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p.badVerb(verb, value)
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p.badVerb(verb)
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}
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}
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func (p *pp) fmtString(v string, verb int, goSyntax bool, value interface{}) {
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func (p *pp) fmtString(v string, verb int, goSyntax bool) {
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switch verb {
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case 'v':
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if goSyntax {
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@ -501,11 +504,11 @@ func (p *pp) fmtString(v string, verb int, goSyntax bool, value interface{}) {
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case 'q':
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p.fmt.fmt_q(v)
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default:
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p.badVerb(verb, value)
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p.badVerb(verb)
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}
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}
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func (p *pp) fmtBytes(v []byte, verb int, goSyntax bool, depth int, value interface{}) {
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func (p *pp) fmtBytes(v []byte, verb int, goSyntax bool, depth int) {
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if verb == 'v' || verb == 'd' {
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if goSyntax {
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p.buf.Write(bytesBytes)
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@ -540,17 +543,17 @@ func (p *pp) fmtBytes(v []byte, verb int, goSyntax bool, depth int, value interf
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case 'q':
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p.fmt.fmt_q(s)
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default:
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p.badVerb(verb, value)
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p.badVerb(verb)
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}
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}
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func (p *pp) fmtPointer(field interface{}, value reflect.Value, verb int, goSyntax bool) {
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func (p *pp) fmtPointer(value reflect.Value, verb int, goSyntax bool) {
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var u uintptr
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switch value.Kind() {
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case reflect.Chan, reflect.Func, reflect.Map, reflect.Ptr, reflect.Slice, reflect.UnsafePointer:
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u = value.Pointer()
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default:
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p.badVerb(verb, field)
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p.badVerb(verb)
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return
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}
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if goSyntax {
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@ -576,12 +579,12 @@ var (
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uintptrBits = reflect.TypeOf(uintptr(0)).Bits()
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)
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func (p *pp) catchPanic(val interface{}, verb int) {
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func (p *pp) catchPanic(field interface{}, verb int) {
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if err := recover(); err != nil {
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// If it's a nil pointer, just say "<nil>". The likeliest causes are a
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// Stringer that fails to guard against nil or a nil pointer for a
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// value receiver, and in either case, "<nil>" is a nice result.
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if v := reflect.ValueOf(val); v.Kind() == reflect.Ptr && v.IsNil() {
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if v := reflect.ValueOf(field); v.Kind() == reflect.Ptr && v.IsNil() {
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p.buf.Write(nilAngleBytes)
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return
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}
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@ -601,12 +604,12 @@ func (p *pp) catchPanic(val interface{}, verb int) {
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}
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}
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func (p *pp) handleMethods(field interface{}, verb int, plus, goSyntax bool, depth int) (wasString, handled bool) {
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func (p *pp) handleMethods(verb int, plus, goSyntax bool, depth int) (wasString, handled bool) {
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// Is it a Formatter?
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if formatter, ok := field.(Formatter); ok {
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if formatter, ok := p.field.(Formatter); ok {
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handled = true
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wasString = false
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defer p.catchPanic(field, verb)
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defer p.catchPanic(p.field, verb)
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formatter.Format(p, verb)
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return
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}
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@ -618,20 +621,20 @@ func (p *pp) handleMethods(field interface{}, verb int, plus, goSyntax bool, dep
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// If we're doing Go syntax and the field knows how to supply it, take care of it now.
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if goSyntax {
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p.fmt.sharp = false
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if stringer, ok := field.(GoStringer); ok {
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if stringer, ok := p.field.(GoStringer); ok {
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wasString = false
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handled = true
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defer p.catchPanic(field, verb)
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defer p.catchPanic(p.field, verb)
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// Print the result of GoString unadorned.
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p.fmtString(stringer.GoString(), 's', false, field)
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p.fmtString(stringer.GoString(), 's', false)
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return
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}
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} else {
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// Is it a Stringer?
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if stringer, ok := field.(Stringer); ok {
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if stringer, ok := p.field.(Stringer); ok {
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wasString = false
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handled = true
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defer p.catchPanic(field, verb)
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defer p.catchPanic(p.field, verb)
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p.printField(stringer.String(), verb, plus, false, depth)
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return
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}
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@ -645,11 +648,13 @@ func (p *pp) printField(field interface{}, verb int, plus, goSyntax bool, depth
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if verb == 'T' || verb == 'v' {
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p.buf.Write(nilAngleBytes)
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} else {
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p.badVerb(verb, field)
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p.badVerb(verb)
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}
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return false
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}
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p.field = field
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p.value = reflect.Value{}
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// Special processing considerations.
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// %T (the value's type) and %p (its address) are special; we always do them first.
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switch verb {
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@ -657,75 +662,61 @@ func (p *pp) printField(field interface{}, verb int, plus, goSyntax bool, depth
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p.printField(reflect.TypeOf(field).String(), 's', false, false, 0)
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return false
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case 'p':
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p.fmtPointer(field, reflect.ValueOf(field), verb, goSyntax)
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p.fmtPointer(reflect.ValueOf(field), verb, goSyntax)
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return false
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}
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if wasString, handled := p.handleMethods(field, verb, plus, goSyntax, depth); handled {
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if wasString, handled := p.handleMethods(verb, plus, goSyntax, depth); handled {
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return wasString
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}
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// Some types can be done without reflection.
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switch f := field.(type) {
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case bool:
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p.fmtBool(f, verb, field)
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return false
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p.fmtBool(f, verb)
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case float32:
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p.fmtFloat32(f, verb, field)
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return false
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p.fmtFloat32(f, verb)
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case float64:
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p.fmtFloat64(f, verb, field)
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return false
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p.fmtFloat64(f, verb)
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case complex64:
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p.fmtComplex64(complex64(f), verb, field)
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return false
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p.fmtComplex64(complex64(f), verb)
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case complex128:
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p.fmtComplex128(f, verb, field)
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return false
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p.fmtComplex128(f, verb)
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case int:
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p.fmtInt64(int64(f), verb, field)
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return false
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p.fmtInt64(int64(f), verb)
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case int8:
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p.fmtInt64(int64(f), verb, field)
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return false
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p.fmtInt64(int64(f), verb)
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case int16:
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p.fmtInt64(int64(f), verb, field)
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return false
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p.fmtInt64(int64(f), verb)
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case int32:
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p.fmtInt64(int64(f), verb, field)
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return false
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p.fmtInt64(int64(f), verb)
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case int64:
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p.fmtInt64(f, verb, field)
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return false
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p.fmtInt64(f, verb)
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case uint:
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p.fmtUint64(uint64(f), verb, goSyntax, field)
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return false
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p.fmtUint64(uint64(f), verb, goSyntax)
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case uint8:
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p.fmtUint64(uint64(f), verb, goSyntax, field)
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return false
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p.fmtUint64(uint64(f), verb, goSyntax)
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case uint16:
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p.fmtUint64(uint64(f), verb, goSyntax, field)
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return false
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p.fmtUint64(uint64(f), verb, goSyntax)
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case uint32:
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p.fmtUint64(uint64(f), verb, goSyntax, field)
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return false
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p.fmtUint64(uint64(f), verb, goSyntax)
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case uint64:
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p.fmtUint64(f, verb, goSyntax, field)
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return false
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p.fmtUint64(f, verb, goSyntax)
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case uintptr:
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p.fmtUint64(uint64(f), verb, goSyntax, field)
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return false
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p.fmtUint64(uint64(f), verb, goSyntax)
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case string:
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p.fmtString(f, verb, goSyntax, field)
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return verb == 's' || verb == 'v'
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p.fmtString(f, verb, goSyntax)
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wasString = verb == 's' || verb == 'v'
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case []byte:
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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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p.fmtBytes(f, verb, goSyntax, depth)
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wasString = verb == 's'
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default:
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// Need to use reflection
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return p.printReflectValue(reflect.ValueOf(field), verb, plus, goSyntax, depth)
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}
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p.field = nil
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return
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}
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// printValue is like printField but starts with a reflect value, not an interface{} value.
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func (p *pp) printValue(value reflect.Value, verb int, plus, goSyntax bool, depth int) (wasString bool) {
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@ -733,7 +724,7 @@ func (p *pp) printValue(value reflect.Value, verb int, plus, goSyntax bool, dept
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if verb == 'T' || verb == 'v' {
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p.buf.Write(nilAngleBytes)
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} else {
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p.badVerb(verb, nil)
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p.badVerb(verb)
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}
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return false
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}
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@ -745,17 +736,17 @@ func (p *pp) printValue(value reflect.Value, verb int, plus, goSyntax bool, dept
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p.printField(value.Type().String(), 's', false, false, 0)
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return false
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case 'p':
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p.fmtPointer(nil, value, verb, goSyntax)
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p.fmtPointer(value, verb, goSyntax)
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return false
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}
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// Handle values with special methods.
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// Call always, even when field == nil, because handleMethods clears p.fmt.plus for us.
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var field interface{}
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p.field = nil // Make sure it's cleared, for safety.
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if value.CanInterface() {
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field = value.Interface()
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p.field = value.Interface()
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}
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if wasString, handled := p.handleMethods(field, verb, plus, goSyntax, depth); handled {
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if wasString, handled := p.handleMethods(verb, plus, goSyntax, depth); handled {
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return wasString
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}
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@ -770,25 +761,25 @@ func (p *pp) printReflectValue(value reflect.Value, verb int, plus, goSyntax boo
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BigSwitch:
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switch f := value; f.Kind() {
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case reflect.Bool:
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p.fmtBool(f.Bool(), verb, nil)
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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, nil)
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p.fmtInt64(f.Int(), verb)
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case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
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p.fmtUint64(uint64(f.Uint()), verb, goSyntax, nil)
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p.fmtUint64(uint64(f.Uint()), verb, goSyntax)
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case reflect.Float32, reflect.Float64:
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if f.Type().Size() == 4 {
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p.fmtFloat32(float32(f.Float()), verb, nil)
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p.fmtFloat32(float32(f.Float()), verb)
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} else {
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p.fmtFloat64(float64(f.Float()), verb, nil)
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p.fmtFloat64(float64(f.Float()), verb)
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}
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case reflect.Complex64, reflect.Complex128:
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if f.Type().Size() == 8 {
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p.fmtComplex64(complex64(f.Complex()), verb, nil)
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p.fmtComplex64(complex64(f.Complex()), verb)
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} else {
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p.fmtComplex128(complex128(f.Complex()), verb, nil)
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p.fmtComplex128(complex128(f.Complex()), verb)
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}
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case reflect.String:
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p.fmtString(f.String(), verb, goSyntax, nil)
|
||||
p.fmtString(f.String(), verb, goSyntax)
|
||||
case reflect.Map:
|
||||
if goSyntax {
|
||||
p.buf.WriteString(f.Type().String())
|
||||
@ -864,7 +855,7 @@ BigSwitch:
|
||||
for i := range bytes {
|
||||
bytes[i] = byte(f.Index(i).Uint())
|
||||
}
|
||||
p.fmtBytes(bytes, verb, goSyntax, depth, nil)
|
||||
p.fmtBytes(bytes, verb, goSyntax, depth)
|
||||
wasString = verb == 's'
|
||||
break
|
||||
}
|
||||
@ -924,7 +915,7 @@ BigSwitch:
|
||||
}
|
||||
p.fmt0x64(uint64(v), true)
|
||||
case reflect.Chan, reflect.Func, reflect.UnsafePointer:
|
||||
p.fmtPointer(nil, value, verb, goSyntax)
|
||||
p.fmtPointer(value, verb, goSyntax)
|
||||
default:
|
||||
p.unknownType(f)
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user