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-rw-r--r--src/reflect/tostring_test.go95
1 files changed, 95 insertions, 0 deletions
diff --git a/src/reflect/tostring_test.go b/src/reflect/tostring_test.go
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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())
+ }
+}