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