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|
package treeprint
import (
"fmt"
"reflect"
"strings"
)
type StructTreeOption int
const (
StructNameTree StructTreeOption = iota
StructValueTree
StructTagTree
StructTypeTree
StructTypeSizeTree
)
func FromStruct(v interface{}, opt ...StructTreeOption) (Tree, error) {
var treeOpt StructTreeOption
if len(opt) > 0 {
treeOpt = opt[0]
}
switch treeOpt {
case StructNameTree:
tree := New()
err := nameTree(tree, v)
return tree, err
case StructValueTree:
tree := New()
err := valueTree(tree, v)
return tree, err
case StructTagTree:
tree := New()
err := tagTree(tree, v)
return tree, err
case StructTypeTree:
tree := New()
err := typeTree(tree, v)
return tree, err
case StructTypeSizeTree:
tree := New()
err := typeSizeTree(tree, v)
return tree, err
default:
err := fmt.Errorf("treeprint: invalid StructTreeOption %v", treeOpt)
return nil, err
}
}
type FmtFunc func(name string, v interface{}) (string, bool)
func FromStructWithMeta(v interface{}, fmtFunc FmtFunc) (Tree, error) {
if fmtFunc == nil {
tree := New()
err := nameTree(tree, v)
return tree, err
}
tree := New()
err := metaTree(tree, v, fmtFunc)
return tree, err
}
func Repr(v interface{}) string {
tree := New()
vType := reflect.TypeOf(v)
vValue := reflect.ValueOf(v)
_, val, isStruct := getValue(vType, &vValue)
if !isStruct {
return fmt.Sprintf("%+v", val.Interface())
}
err := valueTree(tree, val.Interface())
if err != nil {
return err.Error()
}
return tree.String()
}
func nameTree(tree Tree, v interface{}) error {
typ, val, err := checkType(v)
if err != nil {
return err
}
fields := typ.NumField()
for i := 0; i < fields; i++ {
field := typ.Field(i)
fieldValue := val.Field(i)
name, skip, omit := getMeta(field.Name, field.Tag)
if skip || omit && isEmpty(&fieldValue) {
continue
}
typ, val, isStruct := getValue(field.Type, &fieldValue)
if !isStruct {
tree.AddNode(name)
continue
} else if subNum := typ.NumField(); subNum == 0 {
tree.AddNode(name)
continue
}
branch := tree.AddBranch(name)
if err := nameTree(branch, val.Interface()); err != nil {
err := fmt.Errorf("%v on struct branch %s", err, name)
return err
}
}
return nil
}
func getMeta(fieldName string, tag reflect.StructTag) (name string, skip, omit bool) {
if tagStr := tag.Get("tree"); len(tagStr) > 0 {
name, omit = tagSpec(tagStr)
}
if name == "-" {
return fieldName, true, omit
}
if len(name) == 0 {
name = fieldName
} else if trimmed := strings.TrimSpace(name); len(trimmed) == 0 {
name = fieldName
}
return
}
func valueTree(tree Tree, v interface{}) error {
typ, val, err := checkType(v)
if err != nil {
return err
}
fields := typ.NumField()
for i := 0; i < fields; i++ {
field := typ.Field(i)
fieldValue := val.Field(i)
name, skip, omit := getMeta(field.Name, field.Tag)
if skip || omit && isEmpty(&fieldValue) {
continue
}
typ, val, isStruct := getValue(field.Type, &fieldValue)
if !isStruct {
tree.AddMetaNode(val.Interface(), name)
continue
} else if subNum := typ.NumField(); subNum == 0 {
tree.AddMetaNode(val.Interface(), name)
continue
}
branch := tree.AddBranch(name)
if err := valueTree(branch, val.Interface()); err != nil {
err := fmt.Errorf("%v on struct branch %s", err, name)
return err
}
}
return nil
}
func tagTree(tree Tree, v interface{}) error {
typ, val, err := checkType(v)
if err != nil {
return err
}
fields := typ.NumField()
for i := 0; i < fields; i++ {
field := typ.Field(i)
fieldValue := val.Field(i)
name, skip, omit := getMeta(field.Name, field.Tag)
if skip || omit && isEmpty(&fieldValue) {
continue
}
filteredTag := filterTags(field.Tag)
typ, val, isStruct := getValue(field.Type, &fieldValue)
if !isStruct {
tree.AddMetaNode(filteredTag, name)
continue
} else if subNum := typ.NumField(); subNum == 0 {
tree.AddMetaNode(filteredTag, name)
continue
}
branch := tree.AddMetaBranch(filteredTag, name)
if err := tagTree(branch, val.Interface()); err != nil {
err := fmt.Errorf("%v on struct branch %s", err, name)
return err
}
}
return nil
}
func typeTree(tree Tree, v interface{}) error {
typ, val, err := checkType(v)
if err != nil {
return err
}
fields := typ.NumField()
for i := 0; i < fields; i++ {
field := typ.Field(i)
fieldValue := val.Field(i)
name, skip, omit := getMeta(field.Name, field.Tag)
if skip || omit && isEmpty(&fieldValue) {
continue
}
typ, val, isStruct := getValue(field.Type, &fieldValue)
typename := fmt.Sprintf("%T", val.Interface())
if !isStruct {
tree.AddMetaNode(typename, name)
continue
} else if subNum := typ.NumField(); subNum == 0 {
tree.AddMetaNode(typename, name)
continue
}
branch := tree.AddMetaBranch(typename, name)
if err := typeTree(branch, val.Interface()); err != nil {
err := fmt.Errorf("%v on struct branch %s", err, name)
return err
}
}
return nil
}
func typeSizeTree(tree Tree, v interface{}) error {
typ, val, err := checkType(v)
if err != nil {
return err
}
fields := typ.NumField()
for i := 0; i < fields; i++ {
field := typ.Field(i)
fieldValue := val.Field(i)
name, skip, omit := getMeta(field.Name, field.Tag)
if skip || omit && isEmpty(&fieldValue) {
continue
}
typ, val, isStruct := getValue(field.Type, &fieldValue)
typesize := typ.Size()
if !isStruct {
tree.AddMetaNode(typesize, name)
continue
} else if subNum := typ.NumField(); subNum == 0 {
tree.AddMetaNode(typesize, name)
continue
}
branch := tree.AddMetaBranch(typesize, name)
if err := typeSizeTree(branch, val.Interface()); err != nil {
err := fmt.Errorf("%v on struct branch %s", err, name)
return err
}
}
return nil
}
func metaTree(tree Tree, v interface{}, fmtFunc FmtFunc) error {
typ, val, err := checkType(v)
if err != nil {
return err
}
fields := typ.NumField()
for i := 0; i < fields; i++ {
field := typ.Field(i)
fieldValue := val.Field(i)
name, skip, omit := getMeta(field.Name, field.Tag)
if skip || omit && isEmpty(&fieldValue) {
continue
}
typ, val, isStruct := getValue(field.Type, &fieldValue)
formatted, show := fmtFunc(name, val.Interface())
if !isStruct {
if show {
tree.AddMetaNode(formatted, name)
continue
}
tree.AddNode(name)
continue
} else if subNum := typ.NumField(); subNum == 0 {
if show {
tree.AddMetaNode(formatted, name)
continue
}
tree.AddNode(name)
continue
}
var branch Tree
if show {
branch = tree.AddMetaBranch(formatted, name)
} else {
branch = tree.AddBranch(name)
}
if err := metaTree(branch, val.Interface(), fmtFunc); err != nil {
err := fmt.Errorf("%v on struct branch %s", err, name)
return err
}
}
return nil
}
func getValue(typ reflect.Type, val *reflect.Value) (reflect.Type, *reflect.Value, bool) {
switch typ.Kind() {
case reflect.Ptr:
typ = typ.Elem()
if typ.Kind() == reflect.Struct {
elem := val.Elem()
return typ, &elem, true
}
case reflect.Struct:
return typ, val, true
}
return typ, val, false
}
func checkType(v interface{}) (reflect.Type, *reflect.Value, error) {
typ := reflect.TypeOf(v)
val := reflect.ValueOf(v)
switch typ.Kind() {
case reflect.Ptr:
typ = typ.Elem()
if typ.Kind() != reflect.Struct {
err := fmt.Errorf("treeprint: %T is not a struct we could work with", v)
return nil, nil, err
}
val = val.Elem()
case reflect.Struct:
default:
err := fmt.Errorf("treeprint: %T is not a struct we could work with", v)
return nil, nil, err
}
return typ, &val, nil
}
|
