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Diffstat (limited to 'vendor/github.com/magiconair/properties/decode.go')
| -rw-r--r-- | vendor/github.com/magiconair/properties/decode.go | 289 |
1 files changed, 0 insertions, 289 deletions
diff --git a/vendor/github.com/magiconair/properties/decode.go b/vendor/github.com/magiconair/properties/decode.go deleted file mode 100644 index 3ebf804..0000000 --- a/vendor/github.com/magiconair/properties/decode.go +++ /dev/null @@ -1,289 +0,0 @@ -// Copyright 2018 Frank Schroeder. All rights reserved. -// Use of this source code is governed by a BSD-style -// license that can be found in the LICENSE file. - -package properties - -import ( - "fmt" - "reflect" - "strconv" - "strings" - "time" -) - -// Decode assigns property values to exported fields of a struct. -// -// Decode traverses v recursively and returns an error if a value cannot be -// converted to the field type or a required value is missing for a field. -// -// The following type dependent decodings are used: -// -// String, boolean, numeric fields have the value of the property key assigned. -// The property key name is the name of the field. A different key and a default -// value can be set in the field's tag. Fields without default value are -// required. If the value cannot be converted to the field type an error is -// returned. -// -// time.Duration fields have the result of time.ParseDuration() assigned. -// -// time.Time fields have the vaule of time.Parse() assigned. The default layout -// is time.RFC3339 but can be set in the field's tag. -// -// Arrays and slices of string, boolean, numeric, time.Duration and time.Time -// fields have the value interpreted as a comma separated list of values. The -// individual values are trimmed of whitespace and empty values are ignored. A -// default value can be provided as a semicolon separated list in the field's -// tag. -// -// Struct fields are decoded recursively using the field name plus "." as -// prefix. The prefix (without dot) can be overridden in the field's tag. -// Default values are not supported in the field's tag. Specify them on the -// fields of the inner struct instead. -// -// Map fields must have a key of type string and are decoded recursively by -// using the field's name plus ".' as prefix and the next element of the key -// name as map key. The prefix (without dot) can be overridden in the field's -// tag. Default values are not supported. -// -// Examples: -// -// // Field is ignored. -// Field int `properties:"-"` -// -// // Field is assigned value of 'Field'. -// Field int -// -// // Field is assigned value of 'myName'. -// Field int `properties:"myName"` -// -// // Field is assigned value of key 'myName' and has a default -// // value 15 if the key does not exist. -// Field int `properties:"myName,default=15"` -// -// // Field is assigned value of key 'Field' and has a default -// // value 15 if the key does not exist. -// Field int `properties:",default=15"` -// -// // Field is assigned value of key 'date' and the date -// // is in format 2006-01-02 -// Field time.Time `properties:"date,layout=2006-01-02"` -// -// // Field is assigned the non-empty and whitespace trimmed -// // values of key 'Field' split by commas. -// Field []string -// -// // Field is assigned the non-empty and whitespace trimmed -// // values of key 'Field' split by commas and has a default -// // value ["a", "b", "c"] if the key does not exist. -// Field []string `properties:",default=a;b;c"` -// -// // Field is decoded recursively with "Field." as key prefix. -// Field SomeStruct -// -// // Field is decoded recursively with "myName." as key prefix. -// Field SomeStruct `properties:"myName"` -// -// // Field is decoded recursively with "Field." as key prefix -// // and the next dotted element of the key as map key. -// Field map[string]string -// -// // Field is decoded recursively with "myName." as key prefix -// // and the next dotted element of the key as map key. -// Field map[string]string `properties:"myName"` -func (p *Properties) Decode(x interface{}) error { - t, v := reflect.TypeOf(x), reflect.ValueOf(x) - if t.Kind() != reflect.Ptr || v.Elem().Type().Kind() != reflect.Struct { - return fmt.Errorf("not a pointer to struct: %s", t) - } - if err := dec(p, "", nil, nil, v); err != nil { - return err - } - return nil -} - -func dec(p *Properties, key string, def *string, opts map[string]string, v reflect.Value) error { - t := v.Type() - - // value returns the property value for key or the default if provided. - value := func() (string, error) { - if val, ok := p.Get(key); ok { - return val, nil - } - if def != nil { - return *def, nil - } - return "", fmt.Errorf("missing required key %s", key) - } - - // conv converts a string to a value of the given type. - conv := func(s string, t reflect.Type) (val reflect.Value, err error) { - var v interface{} - - switch { - case isDuration(t): - v, err = time.ParseDuration(s) - - case isTime(t): - layout := opts["layout"] - if layout == "" { - layout = time.RFC3339 - } - v, err = time.Parse(layout, s) - - case isBool(t): - v, err = boolVal(s), nil - - case isString(t): - v, err = s, nil - - case isFloat(t): - v, err = strconv.ParseFloat(s, 64) - - case isInt(t): - v, err = strconv.ParseInt(s, 10, 64) - - case isUint(t): - v, err = strconv.ParseUint(s, 10, 64) - - default: - return reflect.Zero(t), fmt.Errorf("unsupported type %s", t) - } - if err != nil { - return reflect.Zero(t), err - } - return reflect.ValueOf(v).Convert(t), nil - } - - // keydef returns the property key and the default value based on the - // name of the struct field and the options in the tag. - keydef := func(f reflect.StructField) (string, *string, map[string]string) { - _key, _opts := parseTag(f.Tag.Get("properties")) - - var _def *string - if d, ok := _opts["default"]; ok { - _def = &d - } - if _key != "" { - return _key, _def, _opts - } - return f.Name, _def, _opts - } - - switch { - case isDuration(t) || isTime(t) || isBool(t) || isString(t) || isFloat(t) || isInt(t) || isUint(t): - s, err := value() - if err != nil { - return err - } - val, err := conv(s, t) - if err != nil { - return err - } - v.Set(val) - - case isPtr(t): - return dec(p, key, def, opts, v.Elem()) - - case isStruct(t): - for i := 0; i < v.NumField(); i++ { - fv := v.Field(i) - fk, def, opts := keydef(t.Field(i)) - if !fv.CanSet() { - return fmt.Errorf("cannot set %s", t.Field(i).Name) - } - if fk == "-" { - continue - } - if key != "" { - fk = key + "." + fk - } - if err := dec(p, fk, def, opts, fv); err != nil { - return err - } - } - return nil - - case isArray(t): - val, err := value() - if err != nil { - return err - } - vals := split(val, ";") - a := reflect.MakeSlice(t, 0, len(vals)) - for _, s := range vals { - val, err := conv(s, t.Elem()) - if err != nil { - return err - } - a = reflect.Append(a, val) - } - v.Set(a) - - case isMap(t): - valT := t.Elem() - m := reflect.MakeMap(t) - for postfix := range p.FilterStripPrefix(key + ".").m { - pp := strings.SplitN(postfix, ".", 2) - mk, mv := pp[0], reflect.New(valT) - if err := dec(p, key+"."+mk, nil, nil, mv); err != nil { - return err - } - m.SetMapIndex(reflect.ValueOf(mk), mv.Elem()) - } - v.Set(m) - - default: - return fmt.Errorf("unsupported type %s", t) - } - return nil -} - -// split splits a string on sep, trims whitespace of elements -// and omits empty elements -func split(s string, sep string) []string { - var a []string - for _, v := range strings.Split(s, sep) { - if v = strings.TrimSpace(v); v != "" { - a = append(a, v) - } - } - return a -} - -// parseTag parses a "key,k=v,k=v,..." -func parseTag(tag string) (key string, opts map[string]string) { - opts = map[string]string{} - for i, s := range strings.Split(tag, ",") { - if i == 0 { - key = s - continue - } - - pp := strings.SplitN(s, "=", 2) - if len(pp) == 1 { - opts[pp[0]] = "" - } else { - opts[pp[0]] = pp[1] - } - } - return key, opts -} - -func isArray(t reflect.Type) bool { return t.Kind() == reflect.Array || t.Kind() == reflect.Slice } -func isBool(t reflect.Type) bool { return t.Kind() == reflect.Bool } -func isDuration(t reflect.Type) bool { return t == reflect.TypeOf(time.Second) } -func isMap(t reflect.Type) bool { return t.Kind() == reflect.Map } -func isPtr(t reflect.Type) bool { return t.Kind() == reflect.Ptr } -func isString(t reflect.Type) bool { return t.Kind() == reflect.String } -func isStruct(t reflect.Type) bool { return t.Kind() == reflect.Struct } -func isTime(t reflect.Type) bool { return t == reflect.TypeOf(time.Time{}) } -func isFloat(t reflect.Type) bool { - return t.Kind() == reflect.Float32 || t.Kind() == reflect.Float64 -} -func isInt(t reflect.Type) bool { - return t.Kind() == reflect.Int || t.Kind() == reflect.Int8 || t.Kind() == reflect.Int16 || t.Kind() == reflect.Int32 || t.Kind() == reflect.Int64 -} -func isUint(t reflect.Type) bool { - return t.Kind() == reflect.Uint || t.Kind() == reflect.Uint8 || t.Kind() == reflect.Uint16 || t.Kind() == reflect.Uint32 || t.Kind() == reflect.Uint64 -} |