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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 == nil {
return "<nil>"
}
typ := val.Type()
switch val := val.(type) {
case *IntValue:
return strconv.Itoa64(val.Get())
case *UintValue:
return strconv.Uitoa64(val.Get())
case *FloatValue:
return strconv.Ftoa64(float64(val.Get()), 'g', -1)
case *ComplexValue:
c := val.Get()
return strconv.Ftoa64(float64(real(c)), 'g', -1) + "+" + strconv.Ftoa64(float64(imag(c)), 'g', -1) + "i"
case *StringValue:
return val.Get()
case *BoolValue:
if val.Get() {
return "true"
} else {
return "false"
}
case *PtrValue:
v := val
str = typ.String() + "("
if v.IsNil() {
str += "0"
} else {
str += "&" + valueToString(v.Elem())
}
str += ")"
return str
case ArrayOrSliceValue:
v := val
str += typ.String()
str += "{"
for i := 0; i < v.Len(); i++ {
if i > 0 {
str += ", "
}
str += valueToString(v.Elem(i))
}
str += "}"
return str
case *MapValue:
t := typ.(*MapType)
str = t.String()
str += "{"
str += "<can't iterate on maps>"
str += "}"
return str
case *ChanValue:
str = typ.String()
return str
case *StructValue:
t := typ.(*StructType)
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 *InterfaceValue:
return typ.String() + "(" + valueToString(val.Elem()) + ")"
case *FuncValue:
v := val
return typ.String() + "(" + strconv.Itoa64(int64(v.Get())) + ")"
default:
panic("valueToString: can't print type " + typ.String())
}
return "valueToString: can't happen"
}
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