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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 reflectlite_test
import (
. "internal/reflectlite"
"reflect"
"strconv"
)
// valueToString returns a textual representation of the reflection value val.
// For debugging only.
func valueToString(v Value) string {
return valueToStringImpl(reflect.ValueOf(ToInterface(v)))
}
func valueToStringImpl(val reflect.Value) string {
var str string
if !val.IsValid() {
return "<zero Value>"
}
typ := val.Type()
switch val.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return strconv.FormatInt(val.Int(), 10)
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return strconv.FormatUint(val.Uint(), 10)
case reflect.Float32, reflect.Float64:
return strconv.FormatFloat(val.Float(), 'g', -1, 64)
case reflect.Complex64, reflect.Complex128:
c := val.Complex()
return strconv.FormatFloat(real(c), 'g', -1, 64) + "+" + strconv.FormatFloat(imag(c), 'g', -1, 64) + "i"
case reflect.String:
return val.String()
case reflect.Bool:
if val.Bool() {
return "true"
} else {
return "false"
}
case reflect.Ptr:
v := val
str = typ.String() + "("
if v.IsNil() {
str += "0"
} else {
str += "&" + valueToStringImpl(v.Elem())
}
str += ")"
return str
case reflect.Array, reflect.Slice:
v := val
str += typ.String()
str += "{"
for i := 0; i < v.Len(); i++ {
if i > 0 {
str += ", "
}
str += valueToStringImpl(v.Index(i))
}
str += "}"
return str
case reflect.Map:
str += typ.String()
str += "{"
str += "<can't iterate on maps>"
str += "}"
return str
case reflect.Chan:
str = typ.String()
return str
case reflect.Struct:
t := typ
v := val
str += t.String()
str += "{"
for i, n := 0, v.NumField(); i < n; i++ {
if i > 0 {
str += ", "
}
str += valueToStringImpl(v.Field(i))
}
str += "}"
return str
case reflect.Interface:
return typ.String() + "(" + valueToStringImpl(val.Elem()) + ")"
case reflect.Func:
return typ.String() + "(arg)"
default:
panic("valueToString: can't print type " + typ.String())
}
}
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