450 lines
12 KiB
Go
450 lines
12 KiB
Go
// Copyright 2014 Unknwon
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//
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// Licensed under the Apache License, Version 2.0 (the "License"): you may
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// not use this file except in compliance with the License. You may obtain
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// 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, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations
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// under the License.
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package ini
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import (
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"bytes"
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"errors"
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"fmt"
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"reflect"
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"strings"
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"time"
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"unicode"
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)
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// NameMapper represents a ini tag name mapper.
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type NameMapper func(string) string
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// Built-in name getters.
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var (
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// AllCapsUnderscore converts to format ALL_CAPS_UNDERSCORE.
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AllCapsUnderscore NameMapper = func(raw string) string {
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newstr := make([]rune, 0, len(raw))
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for i, chr := range raw {
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if isUpper := 'A' <= chr && chr <= 'Z'; isUpper {
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if i > 0 {
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newstr = append(newstr, '_')
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}
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}
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newstr = append(newstr, unicode.ToUpper(chr))
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}
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return string(newstr)
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}
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// TitleUnderscore converts to format title_underscore.
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TitleUnderscore NameMapper = func(raw string) string {
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newstr := make([]rune, 0, len(raw))
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for i, chr := range raw {
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if isUpper := 'A' <= chr && chr <= 'Z'; isUpper {
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if i > 0 {
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newstr = append(newstr, '_')
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}
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chr -= ('A' - 'a')
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}
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newstr = append(newstr, chr)
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}
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return string(newstr)
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}
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)
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func (s *Section) parseFieldName(raw, actual string) string {
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if len(actual) > 0 {
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return actual
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}
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if s.f.NameMapper != nil {
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return s.f.NameMapper(raw)
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}
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return raw
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}
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func parseDelim(actual string) string {
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if len(actual) > 0 {
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return actual
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}
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return ","
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}
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var reflectTime = reflect.TypeOf(time.Now()).Kind()
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// setSliceWithProperType sets proper values to slice based on its type.
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func setSliceWithProperType(key *Key, field reflect.Value, delim string, allowShadow bool) error {
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var strs []string
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if allowShadow {
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strs = key.StringsWithShadows(delim)
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} else {
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strs = key.Strings(delim)
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}
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numVals := len(strs)
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if numVals == 0 {
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return nil
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}
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var vals interface{}
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sliceOf := field.Type().Elem().Kind()
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switch sliceOf {
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case reflect.String:
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vals = strs
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case reflect.Int:
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vals, _ = key.parseInts(strs, true, false)
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case reflect.Int64:
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vals, _ = key.parseInt64s(strs, true, false)
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case reflect.Uint:
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vals = key.Uints(delim)
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case reflect.Uint64:
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vals = key.Uint64s(delim)
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case reflect.Float64:
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vals = key.Float64s(delim)
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case reflectTime:
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vals = key.Times(delim)
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default:
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return fmt.Errorf("unsupported type '[]%s'", sliceOf)
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}
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slice := reflect.MakeSlice(field.Type(), numVals, numVals)
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for i := 0; i < numVals; i++ {
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switch sliceOf {
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case reflect.String:
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slice.Index(i).Set(reflect.ValueOf(vals.([]string)[i]))
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case reflect.Int:
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slice.Index(i).Set(reflect.ValueOf(vals.([]int)[i]))
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case reflect.Int64:
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slice.Index(i).Set(reflect.ValueOf(vals.([]int64)[i]))
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case reflect.Uint:
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slice.Index(i).Set(reflect.ValueOf(vals.([]uint)[i]))
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case reflect.Uint64:
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slice.Index(i).Set(reflect.ValueOf(vals.([]uint64)[i]))
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case reflect.Float64:
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slice.Index(i).Set(reflect.ValueOf(vals.([]float64)[i]))
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case reflectTime:
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slice.Index(i).Set(reflect.ValueOf(vals.([]time.Time)[i]))
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}
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}
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field.Set(slice)
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return nil
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}
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// setWithProperType sets proper value to field based on its type,
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// but it does not return error for failing parsing,
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// because we want to use default value that is already assigned to strcut.
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func setWithProperType(t reflect.Type, key *Key, field reflect.Value, delim string, allowShadow bool) error {
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switch t.Kind() {
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case reflect.String:
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if len(key.String()) == 0 {
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return nil
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}
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field.SetString(key.String())
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case reflect.Bool:
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boolVal, err := key.Bool()
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if err != nil {
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return nil
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}
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field.SetBool(boolVal)
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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durationVal, err := key.Duration()
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// Skip zero value
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if err == nil && int(durationVal) > 0 {
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field.Set(reflect.ValueOf(durationVal))
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return nil
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}
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intVal, err := key.Int64()
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if err != nil || intVal == 0 {
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return nil
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}
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field.SetInt(intVal)
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// byte is an alias for uint8, so supporting uint8 breaks support for byte
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case reflect.Uint, reflect.Uint16, reflect.Uint32, reflect.Uint64:
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durationVal, err := key.Duration()
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// Skip zero value
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if err == nil && int(durationVal) > 0 {
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field.Set(reflect.ValueOf(durationVal))
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return nil
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}
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uintVal, err := key.Uint64()
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if err != nil {
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return nil
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}
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field.SetUint(uintVal)
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case reflect.Float32, reflect.Float64:
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floatVal, err := key.Float64()
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if err != nil {
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return nil
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}
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field.SetFloat(floatVal)
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case reflectTime:
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timeVal, err := key.Time()
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if err != nil {
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return nil
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}
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field.Set(reflect.ValueOf(timeVal))
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case reflect.Slice:
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return setSliceWithProperType(key, field, delim, allowShadow)
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default:
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return fmt.Errorf("unsupported type '%s'", t)
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}
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return nil
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}
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func parseTagOptions(tag string) (rawName string, omitEmpty bool, allowShadow bool) {
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opts := strings.SplitN(tag, ",", 3)
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rawName = opts[0]
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if len(opts) > 1 {
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omitEmpty = opts[1] == "omitempty"
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}
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if len(opts) > 2 {
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allowShadow = opts[2] == "allowshadow"
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}
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return rawName, omitEmpty, allowShadow
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}
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func (s *Section) mapTo(val reflect.Value) error {
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if val.Kind() == reflect.Ptr {
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val = val.Elem()
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}
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typ := val.Type()
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for i := 0; i < typ.NumField(); i++ {
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field := val.Field(i)
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tpField := typ.Field(i)
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tag := tpField.Tag.Get("ini")
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if tag == "-" {
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continue
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}
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rawName, _, allowShadow := parseTagOptions(tag)
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fieldName := s.parseFieldName(tpField.Name, rawName)
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if len(fieldName) == 0 || !field.CanSet() {
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continue
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}
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isAnonymous := tpField.Type.Kind() == reflect.Ptr && tpField.Anonymous
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isStruct := tpField.Type.Kind() == reflect.Struct
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if isAnonymous {
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field.Set(reflect.New(tpField.Type.Elem()))
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}
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if isAnonymous || isStruct {
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if sec, err := s.f.GetSection(fieldName); err == nil {
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if err = sec.mapTo(field); err != nil {
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return fmt.Errorf("error mapping field(%s): %v", fieldName, err)
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}
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continue
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}
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}
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if key, err := s.GetKey(fieldName); err == nil {
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delim := parseDelim(tpField.Tag.Get("delim"))
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if err = setWithProperType(tpField.Type, key, field, delim, allowShadow); err != nil {
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return fmt.Errorf("error mapping field(%s): %v", fieldName, err)
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}
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}
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}
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return nil
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}
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// MapTo maps section to given struct.
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func (s *Section) MapTo(v interface{}) error {
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typ := reflect.TypeOf(v)
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val := reflect.ValueOf(v)
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if typ.Kind() == reflect.Ptr {
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typ = typ.Elem()
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val = val.Elem()
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} else {
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return errors.New("cannot map to non-pointer struct")
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}
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return s.mapTo(val)
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}
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// MapTo maps file to given struct.
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func (f *File) MapTo(v interface{}) error {
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return f.Section("").MapTo(v)
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}
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// MapTo maps data sources to given struct with name mapper.
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func MapToWithMapper(v interface{}, mapper NameMapper, source interface{}, others ...interface{}) error {
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cfg, err := Load(source, others...)
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if err != nil {
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return err
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}
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cfg.NameMapper = mapper
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return cfg.MapTo(v)
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}
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// MapTo maps data sources to given struct.
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func MapTo(v, source interface{}, others ...interface{}) error {
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return MapToWithMapper(v, nil, source, others...)
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}
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// reflectSliceWithProperType does the opposite thing as setSliceWithProperType.
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func reflectSliceWithProperType(key *Key, field reflect.Value, delim string) error {
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slice := field.Slice(0, field.Len())
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if field.Len() == 0 {
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return nil
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}
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var buf bytes.Buffer
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sliceOf := field.Type().Elem().Kind()
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for i := 0; i < field.Len(); i++ {
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switch sliceOf {
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case reflect.String:
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buf.WriteString(slice.Index(i).String())
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case reflect.Int, reflect.Int64:
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buf.WriteString(fmt.Sprint(slice.Index(i).Int()))
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case reflect.Uint, reflect.Uint64:
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buf.WriteString(fmt.Sprint(slice.Index(i).Uint()))
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case reflect.Float64:
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buf.WriteString(fmt.Sprint(slice.Index(i).Float()))
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case reflectTime:
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buf.WriteString(slice.Index(i).Interface().(time.Time).Format(time.RFC3339))
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default:
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return fmt.Errorf("unsupported type '[]%s'", sliceOf)
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}
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buf.WriteString(delim)
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}
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key.SetValue(buf.String()[:buf.Len()-1])
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return nil
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}
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// reflectWithProperType does the opposite thing as setWithProperType.
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func reflectWithProperType(t reflect.Type, key *Key, field reflect.Value, delim string) error {
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switch t.Kind() {
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case reflect.String:
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key.SetValue(field.String())
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case reflect.Bool:
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key.SetValue(fmt.Sprint(field.Bool()))
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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key.SetValue(fmt.Sprint(field.Int()))
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case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
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key.SetValue(fmt.Sprint(field.Uint()))
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case reflect.Float32, reflect.Float64:
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key.SetValue(fmt.Sprint(field.Float()))
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case reflectTime:
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key.SetValue(fmt.Sprint(field.Interface().(time.Time).Format(time.RFC3339)))
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case reflect.Slice:
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return reflectSliceWithProperType(key, field, delim)
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default:
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return fmt.Errorf("unsupported type '%s'", t)
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}
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return nil
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}
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// CR: copied from encoding/json/encode.go with modifications of time.Time support.
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// TODO: add more test coverage.
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func isEmptyValue(v reflect.Value) bool {
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switch v.Kind() {
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case reflect.Array, reflect.Map, reflect.Slice, reflect.String:
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return v.Len() == 0
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case reflect.Bool:
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return !v.Bool()
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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return v.Int() == 0
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case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
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return v.Uint() == 0
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case reflect.Float32, reflect.Float64:
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return v.Float() == 0
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case reflectTime:
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return v.Interface().(time.Time).IsZero()
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case reflect.Interface, reflect.Ptr:
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return v.IsNil()
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}
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return false
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}
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func (s *Section) reflectFrom(val reflect.Value) error {
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if val.Kind() == reflect.Ptr {
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val = val.Elem()
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}
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typ := val.Type()
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for i := 0; i < typ.NumField(); i++ {
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field := val.Field(i)
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tpField := typ.Field(i)
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tag := tpField.Tag.Get("ini")
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if tag == "-" {
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continue
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}
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opts := strings.SplitN(tag, ",", 2)
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if len(opts) == 2 && opts[1] == "omitempty" && isEmptyValue(field) {
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continue
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}
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fieldName := s.parseFieldName(tpField.Name, opts[0])
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if len(fieldName) == 0 || !field.CanSet() {
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continue
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}
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if (tpField.Type.Kind() == reflect.Ptr && tpField.Anonymous) ||
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(tpField.Type.Kind() == reflect.Struct && tpField.Type.Name() != "Time") {
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// Note: The only error here is section doesn't exist.
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sec, err := s.f.GetSection(fieldName)
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if err != nil {
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// Note: fieldName can never be empty here, ignore error.
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sec, _ = s.f.NewSection(fieldName)
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}
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if err = sec.reflectFrom(field); err != nil {
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return fmt.Errorf("error reflecting field (%s): %v", fieldName, err)
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}
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continue
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}
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// Note: Same reason as secion.
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key, err := s.GetKey(fieldName)
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if err != nil {
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key, _ = s.NewKey(fieldName, "")
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}
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if err = reflectWithProperType(tpField.Type, key, field, parseDelim(tpField.Tag.Get("delim"))); err != nil {
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return fmt.Errorf("error reflecting field (%s): %v", fieldName, err)
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}
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}
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return nil
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}
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// ReflectFrom reflects secion from given struct.
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func (s *Section) ReflectFrom(v interface{}) error {
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typ := reflect.TypeOf(v)
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val := reflect.ValueOf(v)
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if typ.Kind() == reflect.Ptr {
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typ = typ.Elem()
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val = val.Elem()
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} else {
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return errors.New("cannot reflect from non-pointer struct")
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}
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return s.reflectFrom(val)
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}
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// ReflectFrom reflects file from given struct.
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func (f *File) ReflectFrom(v interface{}) error {
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return f.Section("").ReflectFrom(v)
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}
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// ReflectFrom reflects data sources from given struct with name mapper.
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func ReflectFromWithMapper(cfg *File, v interface{}, mapper NameMapper) error {
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cfg.NameMapper = mapper
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return cfg.ReflectFrom(v)
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}
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// ReflectFrom reflects data sources from given struct.
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func ReflectFrom(cfg *File, v interface{}) error {
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return ReflectFromWithMapper(cfg, v, nil)
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}
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