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Fix printing of named floating point types.

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Try to avoid infinite recursion if String fails due to
printing a bad type.

Add test for String method with named basic types.

R=r
CC=golang-dev
https://golang.org/cl/207102
This commit is contained in:
Ian Lance Taylor 2010-02-15 22:42:49 -08:00
parent fba50ee5ed
commit 115066fd14
2 changed files with 65 additions and 4 deletions
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8
src/pkg/fmt/print.go
View File

@ -412,7 +412,7 @@ func getFloat32(a interface{}) (val float32, ok bool) {
}
}
// Must be a renamed floating-point type.
switch f := a.(type) {
switch f := reflect.NewValue(a).(type) {
case *reflect.Float32Value:
return float32(f.Get()), true
case *reflect.FloatValue:
@ -434,7 +434,7 @@ func getFloat64(a interface{}) (val float64, ok bool) {
}
}
// Must be a renamed floating-point type.
switch f := a.(type) {
switch f := reflect.NewValue(a).(type) {
case *reflect.Float64Value:
return float64(f.Get()), true
case *reflect.FloatValue:
@ -476,7 +476,7 @@ func (p *pp) unknownType(v interface{}) {
}
func (p *pp) printField(field interface{}, plus, sharp bool, depth int) (was_string bool) {
if field != nil {
if field != nil && depth >= 0 {
switch {
default:
if stringer, ok := field.(Stringer); ok {
@ -948,7 +948,7 @@ func (p *pp) doprintf(format string, a []interface{}) {
p.buf.WriteString(reflect.Typeof(field).String())
p.buf.WriteByte('=')
}
p.printField(field, false, false, 0)
p.printField(field, false, false, -1)
p.buf.WriteByte(')')
}
}

61
src/pkg/fmt/stringer_test.go Normal file
View File

@ -0,0 +1,61 @@
// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package fmt_test
import (
. "fmt"
"testing"
)
type TI int
type TI8 int8
type TI16 int16
type TI32 int32
type TI64 int64
type TU uint
type TU8 uint8
type TU16 uint16
type TU32 uint32
type TU64 uint64
type TUI uintptr
type TF float
type TF32 float32
type TF64 float64
type TB bool
type TS string
func (v TI) String() string { return Sprintf("I: %d", v) }
func (v TI8) String() string { return Sprintf("I8: %d", v) }
func (v TI16) String() string { return Sprintf("I16: %d", v) }
func (v TI32) String() string { return Sprintf("I32: %d", v) }
func (v TI64) String() string { return Sprintf("I64: %d", v) }
func (v TU) String() string { return Sprintf("U: %d", v) }
func (v TU8) String() string { return Sprintf("U8: %d", v) }
func (v TU16) String() string { return Sprintf("U16: %d", v) }
func (v TU32) String() string { return Sprintf("U32: %d", v) }
func (v TU64) String() string { return Sprintf("U64: %d", v) }
func (v TUI) String() string { return Sprintf("UI: %d", v) }
func (v TF) String() string { return Sprintf("F: %f", v) }
func (v TF32) String() string { return Sprintf("F32: %f", v) }
func (v TF64) String() string { return Sprintf("F64: %f", v) }
func (v TB) String() string { return Sprintf("B: %t", v) }
func (v TS) String() string { return Sprintf("S: %q", v) }
func check(t *testing.T, got, want string) {
if got != want {
t.Error(got, "!=", want)
}
}
func TestStringer(t *testing.T) {
s := Sprintf("%v %v %v %v %v", TI(0), TI8(1), TI16(2), TI32(3), TI64(4))
check(t, s, "I: 0 I8: 1 I16: 2 I32: 3 I64: 4")
s = Sprintf("%v %v %v %v %v %v", TU(5), TU8(6), TU16(7), TU32(8), TU64(9), TUI(10))
check(t, s, "U: 5 U8: 6 U16: 7 U32: 8 U64: 9 UI: 10")
s = Sprintf("%v %v %v", TF(1.0), TF32(2.0), TF64(3.0))
check(t, s, "F: 1.000000 F32: 2.000000 F64: 3.000000")
s = Sprintf("%v %v", TB(true), TS("x"))
check(t, s, "B: true S: \"x\"")
}