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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Formatting of reflection types and values for debugging.
// Not defined as methods so they do not need to be linked into most binaries;
// the functions are not used by the library itself, only in tests.
package reflect_test
import (
. "reflect"
"strconv"
)
// valueToString returns a textual representation of the reflection value val.
// For debugging only.
func valueToString(val Value) string {
var str string
if !val.IsValid() {
return "<zero Value>"
}
typ := val.Type()
switch val.Kind() {
case Int, Int8, Int16, Int32, Int64:
return strconv.FormatInt(val.Int(), 10)
case Uint, Uint8, Uint16, Uint32, Uint64, Uintptr:
return strconv.FormatUint(val.Uint(), 10)
case Float32, Float64:
return strconv.FormatFloat(val.Float(), 'g', -1, 64)
case Complex64, Complex128:
c := val.Complex()
return strconv.FormatFloat(real(c), 'g', -1, 64) + "+" + strconv.FormatFloat(imag(c), 'g', -1, 64) + "i"
case String:
return val.String()
case Bool:
if val.Bool() {
return "true"
} else {
return "false"
}
case Pointer:
v := val
str = typ.String() + "("
if v.IsNil() {
str += "0"
} else {
str += "&" + valueToString(v.Elem())
}
str += ")"
return str
case Array, Slice:
v := val
str += typ.String()
str += "{"
for i := 0; i < v.Len(); i++ {
if i > 0 {
str += ", "
}
str += valueToString(v.Index(i))
}
str += "}"
return str
case Map:
t := typ
str = t.String()
str += "{"
str += "<can't iterate on maps>"
str += "}"
return str
case Chan:
str = typ.String()
return str
case Struct:
t := typ
v := val
str += t.String()
str += "{"
for i, n := 0, v.NumField(); i < n; i++ {
if i > 0 {
str += ", "
}
str += valueToString(v.Field(i))
}
str += "}"
return str
case Interface:
return typ.String() + "(" + valueToString(val.Elem()) + ")"
case Func:
v := val
return typ.String() + "(" + strconv.FormatUint(uint64(v.Pointer()), 10) + ")"
default:
panic("valueToString: can't print type " + typ.String())
}
}
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