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|
package gocsv
import (
"reflect"
"strings"
"sync"
)
// --------------------------------------------------------------------------
// Reflection helpers
type structInfo struct {
Fields []fieldInfo
}
// fieldInfo is a struct field that should be mapped to a CSV column, or vice-versa
// Each IndexChain element before the last is the index of an the embedded struct field
// that defines Key as a tag
type fieldInfo struct {
keys []string
omitEmpty bool
IndexChain []int
}
func (f fieldInfo) getFirstKey() string {
return f.keys[0]
}
func (f fieldInfo) matchesKey(key string) bool {
for _, k := range f.keys {
if key == k || strings.TrimSpace(key) == k {
return true
}
}
return false
}
var structInfoCache sync.Map
var structMap = make(map[reflect.Type]*structInfo)
var structMapMutex sync.RWMutex
func getStructInfo(rType reflect.Type) *structInfo {
stInfo, ok := structInfoCache.Load(rType)
if ok {
return stInfo.(*structInfo)
}
fieldsList := getFieldInfos(rType, []int{})
stInfo = &structInfo{fieldsList}
structInfoCache.Store(rType, stInfo)
return stInfo.(*structInfo)
}
func getFieldInfos(rType reflect.Type, parentIndexChain []int) []fieldInfo {
fieldsCount := rType.NumField()
fieldsList := make([]fieldInfo, 0, fieldsCount)
for i := 0; i < fieldsCount; i++ {
field := rType.Field(i)
if field.PkgPath != "" {
continue
}
var cpy = make([]int, len(parentIndexChain))
copy(cpy, parentIndexChain)
indexChain := append(cpy, i)
// if the field is a pointer to a struct, follow the pointer then create fieldinfo for each field
if field.Type.Kind() == reflect.Ptr && field.Type.Elem().Kind() == reflect.Struct {
// unless it implements marshalText or marshalCSV. Structs that implement this
// should result in one value and not have their fields exposed
if !(canMarshal(field.Type.Elem())) {
fieldsList = append(fieldsList, getFieldInfos(field.Type.Elem(), indexChain)...)
}
}
// if the field is a struct, create a fieldInfo for each of its fields
if field.Type.Kind() == reflect.Struct {
// unless it implements marshalText or marshalCSV. Structs that implement this
// should result in one value and not have their fields exposed
if !(canMarshal(field.Type)) {
fieldsList = append(fieldsList, getFieldInfos(field.Type, indexChain)...)
}
}
// if the field is an embedded struct, ignore the csv tag
if field.Anonymous {
continue
}
fieldInfo := fieldInfo{IndexChain: indexChain}
fieldTag := field.Tag.Get(TagName)
fieldTags := strings.Split(fieldTag, TagSeparator)
filteredTags := []string{}
for _, fieldTagEntry := range fieldTags {
if fieldTagEntry != "omitempty" {
filteredTags = append(filteredTags, normalizeName(fieldTagEntry))
} else {
fieldInfo.omitEmpty = true
}
}
if len(filteredTags) == 1 && filteredTags[0] == "-" {
continue
} else if len(filteredTags) > 0 && filteredTags[0] != "" {
fieldInfo.keys = filteredTags
} else {
fieldInfo.keys = []string{normalizeName(field.Name)}
}
fieldsList = append(fieldsList, fieldInfo)
}
return fieldsList
}
func getConcreteContainerInnerType(in reflect.Type) (inInnerWasPointer bool, inInnerType reflect.Type) {
inInnerType = in.Elem()
inInnerWasPointer = false
if inInnerType.Kind() == reflect.Ptr {
inInnerWasPointer = true
inInnerType = inInnerType.Elem()
}
return inInnerWasPointer, inInnerType
}
func getConcreteReflectValueAndType(in interface{}) (reflect.Value, reflect.Type) {
value := reflect.ValueOf(in)
if value.Kind() == reflect.Ptr {
value = value.Elem()
}
return value, value.Type()
}
var errorInterface = reflect.TypeOf((*error)(nil)).Elem()
func isErrorType(outType reflect.Type) bool {
if outType.Kind() != reflect.Interface {
return false
}
return outType.Implements(errorInterface)
}
|
