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// Copyright 2013 Google Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package pretty
import (
"encoding"
"fmt"
"reflect"
"sort"
)
func isZeroVal(val reflect.Value) bool {
if !val.CanInterface() {
return false
}
z := reflect.Zero(val.Type()).Interface()
return reflect.DeepEqual(val.Interface(), z)
}
func (c *Config) val2node(val reflect.Value) node {
// TODO(kevlar): pointer tracking?
if !val.IsValid() {
return rawVal("nil")
}
if val.CanInterface() {
v := val.Interface()
if s, ok := v.(fmt.Stringer); ok && c.PrintStringers {
return stringVal(s.String())
}
if t, ok := v.(encoding.TextMarshaler); ok && c.PrintTextMarshalers {
if raw, err := t.MarshalText(); err == nil { // if NOT an error
return stringVal(string(raw))
}
}
}
switch kind := val.Kind(); kind {
case reflect.Ptr, reflect.Interface:
if val.IsNil() {
return rawVal("nil")
}
return c.val2node(val.Elem())
case reflect.String:
return stringVal(val.String())
case reflect.Slice, reflect.Array:
n := list{}
length := val.Len()
for i := 0; i < length; i++ {
n = append(n, c.val2node(val.Index(i)))
}
return n
case reflect.Map:
n := keyvals{}
keys := val.MapKeys()
for _, key := range keys {
// TODO(kevlar): Support arbitrary type keys?
n = append(n, keyval{compactString(c.val2node(key)), c.val2node(val.MapIndex(key))})
}
sort.Sort(n)
return n
case reflect.Struct:
n := keyvals{}
typ := val.Type()
fields := typ.NumField()
for i := 0; i < fields; i++ {
sf := typ.Field(i)
if !c.IncludeUnexported && sf.PkgPath != "" {
continue
}
field := val.Field(i)
if c.SkipZeroFields && isZeroVal(field) {
continue
}
n = append(n, keyval{sf.Name, c.val2node(field)})
}
return n
case reflect.Bool:
if val.Bool() {
return rawVal("true")
}
return rawVal("false")
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return rawVal(fmt.Sprintf("%d", val.Int()))
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
return rawVal(fmt.Sprintf("%d", val.Uint()))
case reflect.Uintptr:
return rawVal(fmt.Sprintf("0x%X", val.Uint()))
case reflect.Float32, reflect.Float64:
return rawVal(fmt.Sprintf("%v", val.Float()))
case reflect.Complex64, reflect.Complex128:
return rawVal(fmt.Sprintf("%v", val.Complex()))
}
// Fall back to the default %#v if we can
if val.CanInterface() {
return rawVal(fmt.Sprintf("%#v", val.Interface()))
}
return rawVal(val.String())
}
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