forked from mirror/cast
1118 lines
23 KiB
Go
1118 lines
23 KiB
Go
// Copyright © 2014 Steve Francia <spf@spf13.com>.
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//
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// Use of this source code is governed by an MIT-style
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// license that can be found in the LICENSE file.
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package cast
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import (
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"errors"
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"fmt"
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"html/template"
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"reflect"
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"strconv"
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"strings"
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"time"
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)
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var errNegativeNotAllowed = errors.New("unable to cast negative value")
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// ToTimeE casts an interface to a time.Time type.
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func ToTimeE(i interface{}) (tim time.Time, err error) {
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i = indirect(i)
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switch v := i.(type) {
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case time.Time:
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return v, nil
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case string:
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return StringToDate(v)
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case int:
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return time.Unix(int64(v), 0), nil
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case int64:
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return time.Unix(v, 0), nil
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case int32:
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return time.Unix(int64(v), 0), nil
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case uint:
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return time.Unix(int64(v), 0), nil
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case uint64:
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return time.Unix(int64(v), 0), nil
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case uint32:
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return time.Unix(int64(v), 0), nil
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default:
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return time.Time{}, fmt.Errorf("unable to cast %#v of type %T to Time", i, i)
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}
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}
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// ToDurationE casts an interface to a time.Duration type.
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func ToDurationE(i interface{}) (d time.Duration, err error) {
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i = indirect(i)
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switch s := i.(type) {
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case time.Duration:
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return s, nil
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case int, int64, int32, int16, int8, uint, uint64, uint32, uint16, uint8:
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d = time.Duration(ToInt64(s))
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return
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case float32, float64:
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d = time.Duration(ToFloat64(s))
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return
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case string:
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if strings.ContainsAny(s, "nsuµmh") {
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d, err = time.ParseDuration(s)
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} else {
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d, err = time.ParseDuration(s + "ns")
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}
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return
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default:
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err = fmt.Errorf("unable to cast %#v of type %T to Duration", i, i)
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return
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}
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}
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// ToBoolE casts an interface to a bool type.
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func ToBoolE(i interface{}) (bool, error) {
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i = indirect(i)
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switch b := i.(type) {
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case bool:
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return b, nil
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case nil:
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return false, nil
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case int:
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if i.(int) != 0 {
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return true, nil
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}
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return false, nil
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case string:
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return strconv.ParseBool(i.(string))
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default:
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return false, fmt.Errorf("unable to cast %#v of type %T to bool", i, i)
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}
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}
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// ToFloat64E casts an interface to a float64 type.
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func ToFloat64E(i interface{}) (float64, error) {
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i = indirect(i)
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switch s := i.(type) {
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case float64:
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return s, nil
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case float32:
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return float64(s), nil
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case int:
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return float64(s), nil
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case int64:
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return float64(s), nil
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case int32:
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return float64(s), nil
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case int16:
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return float64(s), nil
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case int8:
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return float64(s), nil
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case uint:
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return float64(s), nil
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case uint64:
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return float64(s), nil
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case uint32:
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return float64(s), nil
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case uint16:
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return float64(s), nil
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case uint8:
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return float64(s), nil
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case string:
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v, err := strconv.ParseFloat(s, 64)
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if err == nil {
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return float64(v), nil
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}
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return 0.0, fmt.Errorf("unable to cast %#v of type %T to float64", i, i)
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case bool:
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if s {
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return 1, nil
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}
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return 0, nil
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default:
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return 0.0, fmt.Errorf("unable to cast %#v of type %T to float64", i, i)
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}
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}
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// ToFloat32E casts an interface to a float32 type.
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func ToFloat32E(i interface{}) (float32, error) {
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i = indirect(i)
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switch s := i.(type) {
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case float64:
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return float32(s), nil
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case float32:
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return s, nil
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case int:
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return float32(s), nil
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case int64:
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return float32(s), nil
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case int32:
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return float32(s), nil
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case int16:
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return float32(s), nil
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case int8:
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return float32(s), nil
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case uint:
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return float32(s), nil
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case uint64:
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return float32(s), nil
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case uint32:
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return float32(s), nil
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case uint16:
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return float32(s), nil
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case uint8:
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return float32(s), nil
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case string:
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v, err := strconv.ParseFloat(s, 32)
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if err == nil {
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return float32(v), nil
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}
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return 0, fmt.Errorf("unable to cast %#v of type %T to float32", i, i)
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case bool:
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if s {
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return 1, nil
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}
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return 0, nil
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default:
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return 0, fmt.Errorf("unable to cast %#v of type %T to float32", i, i)
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}
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}
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// ToInt64E casts an interface to an int64 type.
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func ToInt64E(i interface{}) (int64, error) {
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i = indirect(i)
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switch s := i.(type) {
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case int:
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return int64(s), nil
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case int64:
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return s, nil
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case int32:
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return int64(s), nil
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case int16:
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return int64(s), nil
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case int8:
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return int64(s), nil
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case uint:
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return int64(s), nil
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case uint64:
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return int64(s), nil
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case uint32:
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return int64(s), nil
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case uint16:
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return int64(s), nil
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case uint8:
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return int64(s), nil
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case float64:
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return int64(s), nil
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case float32:
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return int64(s), nil
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case string:
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v, err := strconv.ParseInt(s, 0, 0)
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if err == nil {
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return v, nil
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}
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return 0, fmt.Errorf("unable to cast %#v of type %T to int64", i, i)
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case bool:
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if bool(s) {
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return int64(1), nil
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}
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return int64(0), nil
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case nil:
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return int64(0), nil
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default:
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return int64(0), fmt.Errorf("unable to cast %#v of type %T to int64", i, i)
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}
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}
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// ToInt32E casts an interface to an int32 type.
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func ToInt32E(i interface{}) (int32, error) {
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i = indirect(i)
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switch s := i.(type) {
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case int:
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return int32(s), nil
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case int64:
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return int32(s), nil
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case int32:
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return s, nil
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case int16:
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return int32(s), nil
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case int8:
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return int32(s), nil
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case uint:
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return int32(s), nil
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case uint64:
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return int32(s), nil
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case uint32:
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return int32(s), nil
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case uint16:
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return int32(s), nil
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case uint8:
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return int32(s), nil
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case float64:
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return int32(s), nil
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case float32:
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return int32(s), nil
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case string:
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v, err := strconv.ParseInt(s, 0, 0)
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if err == nil {
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return int32(v), nil
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}
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return 0, fmt.Errorf("unable to cast %#v of type %T to int32", i, i)
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case bool:
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if bool(s) {
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return int32(1), nil
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}
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return int32(0), nil
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case nil:
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return int32(0), nil
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default:
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return int32(0), fmt.Errorf("unable to cast %#v of type %T to int32", i, i)
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}
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}
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// ToInt16E casts an interface to an int16 type.
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func ToInt16E(i interface{}) (int16, error) {
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i = indirect(i)
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switch s := i.(type) {
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case int:
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return int16(s), nil
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case int64:
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return int16(s), nil
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case int32:
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return int16(s), nil
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case int16:
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return s, nil
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case int8:
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return int16(s), nil
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case uint:
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return int16(s), nil
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case uint64:
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return int16(s), nil
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case uint32:
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return int16(s), nil
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case uint16:
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return int16(s), nil
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case uint8:
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return int16(s), nil
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case float64:
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return int16(s), nil
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case float32:
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return int16(s), nil
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case string:
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v, err := strconv.ParseInt(s, 0, 0)
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if err == nil {
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return int16(v), nil
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}
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return 0, fmt.Errorf("unable to cast %#v of type %T to int16", i, i)
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case bool:
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if bool(s) {
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return int16(1), nil
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}
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return int16(0), nil
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case nil:
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return int16(0), nil
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default:
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return int16(0), fmt.Errorf("unable to cast %#v of type %T to int16", i, i)
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}
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}
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// ToInt8E casts an interface to an int8 type.
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func ToInt8E(i interface{}) (int8, error) {
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i = indirect(i)
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switch s := i.(type) {
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case int:
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return int8(s), nil
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case int64:
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return int8(s), nil
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case int32:
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return int8(s), nil
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case int16:
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return int8(s), nil
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case int8:
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return s, nil
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case uint:
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return int8(s), nil
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case uint64:
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return int8(s), nil
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case uint32:
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return int8(s), nil
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case uint16:
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return int8(s), nil
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case uint8:
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return int8(s), nil
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case float64:
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return int8(s), nil
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case float32:
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return int8(s), nil
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case string:
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v, err := strconv.ParseInt(s, 0, 0)
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if err == nil {
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return int8(v), nil
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}
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return 0, fmt.Errorf("unable to cast %#v of type %T to int8", i, i)
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case bool:
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if bool(s) {
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return int8(1), nil
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}
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return int8(0), nil
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case nil:
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return int8(0), nil
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default:
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return int8(0), fmt.Errorf("unable to cast %#v of type %T to int8", i, i)
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}
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}
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// ToIntE casts an interface to an int type.
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func ToIntE(i interface{}) (int, error) {
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i = indirect(i)
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switch s := i.(type) {
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case int:
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return s, nil
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case int64:
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return int(s), nil
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case int32:
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return int(s), nil
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case int16:
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return int(s), nil
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case int8:
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return int(s), nil
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case uint:
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return int(s), nil
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case uint64:
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return int(s), nil
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case uint32:
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return int(s), nil
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case uint16:
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return int(s), nil
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case uint8:
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return int(s), nil
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case float64:
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return int(s), nil
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case float32:
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return int(s), nil
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case string:
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v, err := strconv.ParseInt(s, 0, 0)
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if err == nil {
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return int(v), nil
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}
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return 0, fmt.Errorf("unable to cast %#v of type %T to int", i, i)
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case bool:
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if bool(s) {
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return 1, nil
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}
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return 0, nil
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case nil:
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return 0, nil
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default:
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return 0, fmt.Errorf("unable to cast %#v of type %T to int", i, i)
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}
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}
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// ToUintE casts an interface to a uint type.
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func ToUintE(i interface{}) (uint, error) {
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i = indirect(i)
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switch s := i.(type) {
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case string:
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v, err := strconv.ParseUint(s, 0, 0)
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if err == nil {
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return uint(v), nil
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}
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return 0, fmt.Errorf("unable to cast %#v to uint: %s", i, err)
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case int:
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if s < 0 {
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return 0, errNegativeNotAllowed
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}
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return uint(s), nil
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case int64:
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if s < 0 {
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return 0, errNegativeNotAllowed
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}
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return uint(s), nil
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case int32:
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if s < 0 {
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return 0, errNegativeNotAllowed
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}
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return uint(s), nil
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case int16:
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if s < 0 {
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return 0, errNegativeNotAllowed
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}
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return uint(s), nil
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case int8:
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if s < 0 {
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return 0, errNegativeNotAllowed
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}
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return uint(s), nil
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case uint:
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return s, nil
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case uint64:
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return uint(s), nil
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case uint32:
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return uint(s), nil
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case uint16:
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return uint(s), nil
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case uint8:
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return uint(s), nil
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case float64:
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if s < 0 {
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return 0, errNegativeNotAllowed
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}
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return uint(s), nil
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case float32:
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if s < 0 {
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return 0, errNegativeNotAllowed
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}
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return uint(s), nil
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case bool:
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if s {
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return 1, nil
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}
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return 0, nil
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case nil:
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return 0, nil
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default:
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return 0, fmt.Errorf("unable to cast %#v of type %T to uint", i, i)
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}
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}
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// ToUint64E casts an interface to a uint64 type.
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func ToUint64E(i interface{}) (uint64, error) {
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i = indirect(i)
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switch s := i.(type) {
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case string:
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v, err := strconv.ParseUint(s, 0, 64)
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if err == nil {
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return v, nil
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}
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return 0, fmt.Errorf("unable to cast %#v to uint64: %s", i, err)
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case int:
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if s < 0 {
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return 0, errNegativeNotAllowed
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}
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return uint64(s), nil
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case int64:
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if s < 0 {
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return 0, errNegativeNotAllowed
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}
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return uint64(s), nil
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case int32:
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if s < 0 {
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return 0, errNegativeNotAllowed
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}
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return uint64(s), nil
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case int16:
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if s < 0 {
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return 0, errNegativeNotAllowed
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}
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return uint64(s), nil
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case int8:
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if s < 0 {
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return 0, errNegativeNotAllowed
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}
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return uint64(s), nil
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case uint:
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return uint64(s), nil
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case uint64:
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return s, nil
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case uint32:
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return uint64(s), nil
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case uint16:
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return uint64(s), nil
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case uint8:
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return uint64(s), nil
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case float32:
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if s < 0 {
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return 0, errNegativeNotAllowed
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}
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return uint64(s), nil
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case float64:
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if s < 0 {
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return 0, errNegativeNotAllowed
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}
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return uint64(s), nil
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case bool:
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if s {
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return 1, nil
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}
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return 0, nil
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case nil:
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return 0, nil
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default:
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return 0, fmt.Errorf("unable to cast %#v of type %T to uint64", i, i)
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}
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}
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|
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// ToUint32E casts an interface to a uint32 type.
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func ToUint32E(i interface{}) (uint32, error) {
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i = indirect(i)
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|
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switch s := i.(type) {
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case string:
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v, err := strconv.ParseUint(s, 0, 32)
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if err == nil {
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return uint32(v), nil
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}
|
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return 0, fmt.Errorf("unable to cast %#v to uint32: %s", i, err)
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case int:
|
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if s < 0 {
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return 0, errNegativeNotAllowed
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}
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return uint32(s), nil
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case int64:
|
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if s < 0 {
|
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return 0, errNegativeNotAllowed
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}
|
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return uint32(s), nil
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case int32:
|
|
if s < 0 {
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return 0, errNegativeNotAllowed
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}
|
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return uint32(s), nil
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case int16:
|
|
if s < 0 {
|
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return 0, errNegativeNotAllowed
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}
|
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return uint32(s), nil
|
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case int8:
|
|
if s < 0 {
|
|
return 0, errNegativeNotAllowed
|
|
}
|
|
return uint32(s), nil
|
|
case uint:
|
|
return uint32(s), nil
|
|
case uint64:
|
|
return uint32(s), nil
|
|
case uint32:
|
|
return s, nil
|
|
case uint16:
|
|
return uint32(s), nil
|
|
case uint8:
|
|
return uint32(s), nil
|
|
case float64:
|
|
if s < 0 {
|
|
return 0, errNegativeNotAllowed
|
|
}
|
|
return uint32(s), nil
|
|
case float32:
|
|
if s < 0 {
|
|
return 0, errNegativeNotAllowed
|
|
}
|
|
return uint32(s), nil
|
|
case bool:
|
|
if s {
|
|
return 1, nil
|
|
}
|
|
return 0, nil
|
|
case nil:
|
|
return 0, nil
|
|
default:
|
|
return 0, fmt.Errorf("unable to cast %#v of type %T to uint32", i, i)
|
|
}
|
|
}
|
|
|
|
// ToUint16E casts an interface to a uint16 type.
|
|
func ToUint16E(i interface{}) (uint16, error) {
|
|
i = indirect(i)
|
|
|
|
switch s := i.(type) {
|
|
case string:
|
|
v, err := strconv.ParseUint(s, 0, 16)
|
|
if err == nil {
|
|
return uint16(v), nil
|
|
}
|
|
return 0, fmt.Errorf("unable to cast %#v to uint16: %s", i, err)
|
|
case int:
|
|
if s < 0 {
|
|
return 0, errNegativeNotAllowed
|
|
}
|
|
return uint16(s), nil
|
|
case int64:
|
|
if s < 0 {
|
|
return 0, errNegativeNotAllowed
|
|
}
|
|
return uint16(s), nil
|
|
case int32:
|
|
if s < 0 {
|
|
return 0, errNegativeNotAllowed
|
|
}
|
|
return uint16(s), nil
|
|
case int16:
|
|
if s < 0 {
|
|
return 0, errNegativeNotAllowed
|
|
}
|
|
return uint16(s), nil
|
|
case int8:
|
|
if s < 0 {
|
|
return 0, errNegativeNotAllowed
|
|
}
|
|
return uint16(s), nil
|
|
case uint:
|
|
return uint16(s), nil
|
|
case uint64:
|
|
return uint16(s), nil
|
|
case uint32:
|
|
return uint16(s), nil
|
|
case uint16:
|
|
return s, nil
|
|
case uint8:
|
|
return uint16(s), nil
|
|
case float64:
|
|
if s < 0 {
|
|
return 0, errNegativeNotAllowed
|
|
}
|
|
return uint16(s), nil
|
|
case float32:
|
|
if s < 0 {
|
|
return 0, errNegativeNotAllowed
|
|
}
|
|
return uint16(s), nil
|
|
case bool:
|
|
if s {
|
|
return 1, nil
|
|
}
|
|
return 0, nil
|
|
case nil:
|
|
return 0, nil
|
|
default:
|
|
return 0, fmt.Errorf("unable to cast %#v of type %T to uint16", i, i)
|
|
}
|
|
}
|
|
|
|
// ToUint8E casts an interface to a uint type.
|
|
func ToUint8E(i interface{}) (uint8, error) {
|
|
i = indirect(i)
|
|
|
|
switch s := i.(type) {
|
|
case string:
|
|
v, err := strconv.ParseUint(s, 0, 8)
|
|
if err == nil {
|
|
return uint8(v), nil
|
|
}
|
|
return 0, fmt.Errorf("unable to cast %#v to uint8: %s", i, err)
|
|
case int:
|
|
if s < 0 {
|
|
return 0, errNegativeNotAllowed
|
|
}
|
|
return uint8(s), nil
|
|
case int64:
|
|
if s < 0 {
|
|
return 0, errNegativeNotAllowed
|
|
}
|
|
return uint8(s), nil
|
|
case int32:
|
|
if s < 0 {
|
|
return 0, errNegativeNotAllowed
|
|
}
|
|
return uint8(s), nil
|
|
case int16:
|
|
if s < 0 {
|
|
return 0, errNegativeNotAllowed
|
|
}
|
|
return uint8(s), nil
|
|
case int8:
|
|
if s < 0 {
|
|
return 0, errNegativeNotAllowed
|
|
}
|
|
return uint8(s), nil
|
|
case uint:
|
|
return uint8(s), nil
|
|
case uint64:
|
|
return uint8(s), nil
|
|
case uint32:
|
|
return uint8(s), nil
|
|
case uint16:
|
|
return uint8(s), nil
|
|
case uint8:
|
|
return s, nil
|
|
case float64:
|
|
if s < 0 {
|
|
return 0, errNegativeNotAllowed
|
|
}
|
|
return uint8(s), nil
|
|
case float32:
|
|
if s < 0 {
|
|
return 0, errNegativeNotAllowed
|
|
}
|
|
return uint8(s), nil
|
|
case bool:
|
|
if s {
|
|
return 1, nil
|
|
}
|
|
return 0, nil
|
|
case nil:
|
|
return 0, nil
|
|
default:
|
|
return 0, fmt.Errorf("unable to cast %#v of type %T to uint8", i, i)
|
|
}
|
|
}
|
|
|
|
// From html/template/content.go
|
|
// Copyright 2011 The Go Authors. All rights reserved.
|
|
// indirect returns the value, after dereferencing as many times
|
|
// as necessary to reach the base type (or nil).
|
|
func indirect(a interface{}) interface{} {
|
|
if a == nil {
|
|
return nil
|
|
}
|
|
if t := reflect.TypeOf(a); t.Kind() != reflect.Ptr {
|
|
// Avoid creating a reflect.Value if it's not a pointer.
|
|
return a
|
|
}
|
|
v := reflect.ValueOf(a)
|
|
for v.Kind() == reflect.Ptr && !v.IsNil() {
|
|
v = v.Elem()
|
|
}
|
|
return v.Interface()
|
|
}
|
|
|
|
// From html/template/content.go
|
|
// Copyright 2011 The Go Authors. All rights reserved.
|
|
// indirectToStringerOrError returns the value, after dereferencing as many times
|
|
// as necessary to reach the base type (or nil) or an implementation of fmt.Stringer
|
|
// or error,
|
|
func indirectToStringerOrError(a interface{}) interface{} {
|
|
if a == nil {
|
|
return nil
|
|
}
|
|
|
|
var errorType = reflect.TypeOf((*error)(nil)).Elem()
|
|
var fmtStringerType = reflect.TypeOf((*fmt.Stringer)(nil)).Elem()
|
|
|
|
v := reflect.ValueOf(a)
|
|
for !v.Type().Implements(fmtStringerType) && !v.Type().Implements(errorType) && v.Kind() == reflect.Ptr && !v.IsNil() {
|
|
v = v.Elem()
|
|
}
|
|
return v.Interface()
|
|
}
|
|
|
|
// ToStringE casts an interface to a string type.
|
|
func ToStringE(i interface{}) (string, error) {
|
|
i = indirectToStringerOrError(i)
|
|
|
|
switch s := i.(type) {
|
|
case string:
|
|
return s, nil
|
|
case bool:
|
|
return strconv.FormatBool(s), nil
|
|
case float64:
|
|
return strconv.FormatFloat(s, 'f', -1, 64), nil
|
|
case float32:
|
|
return strconv.FormatFloat(float64(s), 'f', -1, 32), nil
|
|
case int:
|
|
return strconv.Itoa(s), nil
|
|
case int64:
|
|
return strconv.FormatInt(s, 10), nil
|
|
case int32:
|
|
return strconv.Itoa(int(s)), nil
|
|
case int16:
|
|
return strconv.FormatInt(int64(s), 10), nil
|
|
case int8:
|
|
return strconv.FormatInt(int64(s), 10), nil
|
|
case uint:
|
|
return strconv.FormatInt(int64(s), 10), nil
|
|
case uint64:
|
|
return strconv.FormatInt(int64(s), 10), nil
|
|
case uint32:
|
|
return strconv.FormatInt(int64(s), 10), nil
|
|
case uint16:
|
|
return strconv.FormatInt(int64(s), 10), nil
|
|
case uint8:
|
|
return strconv.FormatInt(int64(s), 10), nil
|
|
case []byte:
|
|
return string(s), nil
|
|
case template.HTML:
|
|
return string(s), nil
|
|
case template.URL:
|
|
return string(s), nil
|
|
case template.JS:
|
|
return string(s), nil
|
|
case template.CSS:
|
|
return string(s), nil
|
|
case template.HTMLAttr:
|
|
return string(s), nil
|
|
case nil:
|
|
return "", nil
|
|
case fmt.Stringer:
|
|
return s.String(), nil
|
|
case error:
|
|
return s.Error(), nil
|
|
default:
|
|
return "", fmt.Errorf("unable to cast %#v of type %T to string", i, i)
|
|
}
|
|
}
|
|
|
|
// ToStringMapStringE casts an interface to a map[string]string type.
|
|
func ToStringMapStringE(i interface{}) (map[string]string, error) {
|
|
var m = map[string]string{}
|
|
|
|
switch v := i.(type) {
|
|
case map[string]string:
|
|
return v, nil
|
|
case map[string]interface{}:
|
|
for k, val := range v {
|
|
m[ToString(k)] = ToString(val)
|
|
}
|
|
return m, nil
|
|
case map[interface{}]string:
|
|
for k, val := range v {
|
|
m[ToString(k)] = ToString(val)
|
|
}
|
|
return m, nil
|
|
case map[interface{}]interface{}:
|
|
for k, val := range v {
|
|
m[ToString(k)] = ToString(val)
|
|
}
|
|
return m, nil
|
|
default:
|
|
return m, fmt.Errorf("unable to cast %#v of type %T to map[string]string", i, i)
|
|
}
|
|
}
|
|
|
|
// ToStringMapStringSliceE casts an interface to a map[string][]string type.
|
|
func ToStringMapStringSliceE(i interface{}) (map[string][]string, error) {
|
|
var m = map[string][]string{}
|
|
|
|
switch v := i.(type) {
|
|
case map[string][]string:
|
|
return v, nil
|
|
case map[string][]interface{}:
|
|
for k, val := range v {
|
|
m[ToString(k)] = ToStringSlice(val)
|
|
}
|
|
return m, nil
|
|
case map[string]string:
|
|
for k, val := range v {
|
|
m[ToString(k)] = []string{val}
|
|
}
|
|
case map[string]interface{}:
|
|
for k, val := range v {
|
|
switch vt := val.(type) {
|
|
case []interface{}:
|
|
m[ToString(k)] = ToStringSlice(vt)
|
|
case []string:
|
|
m[ToString(k)] = vt
|
|
default:
|
|
m[ToString(k)] = []string{ToString(val)}
|
|
}
|
|
}
|
|
return m, nil
|
|
case map[interface{}][]string:
|
|
for k, val := range v {
|
|
m[ToString(k)] = ToStringSlice(val)
|
|
}
|
|
return m, nil
|
|
case map[interface{}]string:
|
|
for k, val := range v {
|
|
m[ToString(k)] = ToStringSlice(val)
|
|
}
|
|
return m, nil
|
|
case map[interface{}][]interface{}:
|
|
for k, val := range v {
|
|
m[ToString(k)] = ToStringSlice(val)
|
|
}
|
|
return m, nil
|
|
case map[interface{}]interface{}:
|
|
for k, val := range v {
|
|
key, err := ToStringE(k)
|
|
if err != nil {
|
|
return m, fmt.Errorf("unable to cast %#v of type %T to map[string][]string", i, i)
|
|
}
|
|
value, err := ToStringSliceE(val)
|
|
if err != nil {
|
|
return m, fmt.Errorf("unable to cast %#v of type %T to map[string][]string", i, i)
|
|
}
|
|
m[key] = value
|
|
}
|
|
default:
|
|
return m, fmt.Errorf("unable to cast %#v of type %T to map[string][]string", i, i)
|
|
}
|
|
return m, nil
|
|
}
|
|
|
|
// ToStringMapBoolE casts an interface to a map[string]bool type.
|
|
func ToStringMapBoolE(i interface{}) (map[string]bool, error) {
|
|
var m = map[string]bool{}
|
|
|
|
switch v := i.(type) {
|
|
case map[interface{}]interface{}:
|
|
for k, val := range v {
|
|
m[ToString(k)] = ToBool(val)
|
|
}
|
|
return m, nil
|
|
case map[string]interface{}:
|
|
for k, val := range v {
|
|
m[ToString(k)] = ToBool(val)
|
|
}
|
|
return m, nil
|
|
case map[string]bool:
|
|
return v, nil
|
|
default:
|
|
return m, fmt.Errorf("unable to cast %#v of type %T to map[string]bool", i, i)
|
|
}
|
|
}
|
|
|
|
// ToStringMapE casts an interface to a map[string]interface{} type.
|
|
func ToStringMapE(i interface{}) (map[string]interface{}, error) {
|
|
var m = map[string]interface{}{}
|
|
|
|
switch v := i.(type) {
|
|
case map[interface{}]interface{}:
|
|
for k, val := range v {
|
|
m[ToString(k)] = val
|
|
}
|
|
return m, nil
|
|
case map[string]interface{}:
|
|
return v, nil
|
|
default:
|
|
return m, fmt.Errorf("unable to cast %#v of type %T to map[string]interface{}", i, i)
|
|
}
|
|
}
|
|
|
|
// ToSliceE casts an interface to a []interface{} type.
|
|
func ToSliceE(i interface{}) ([]interface{}, error) {
|
|
var s []interface{}
|
|
|
|
switch v := i.(type) {
|
|
case []interface{}:
|
|
return append(s, v...), nil
|
|
case []map[string]interface{}:
|
|
for _, u := range v {
|
|
s = append(s, u)
|
|
}
|
|
return s, nil
|
|
default:
|
|
return s, fmt.Errorf("unable to cast %#v of type %T to []interface{}", i, i)
|
|
}
|
|
}
|
|
|
|
// ToBoolSliceE casts an interface to a []bool type.
|
|
func ToBoolSliceE(i interface{}) ([]bool, error) {
|
|
if i == nil {
|
|
return []bool{}, fmt.Errorf("unable to cast %#v of type %T to []bool", i, i)
|
|
}
|
|
|
|
switch v := i.(type) {
|
|
case []bool:
|
|
return v, nil
|
|
}
|
|
|
|
kind := reflect.TypeOf(i).Kind()
|
|
switch kind {
|
|
case reflect.Slice, reflect.Array:
|
|
s := reflect.ValueOf(i)
|
|
a := make([]bool, s.Len())
|
|
for j := 0; j < s.Len(); j++ {
|
|
val, err := ToBoolE(s.Index(j).Interface())
|
|
if err != nil {
|
|
return []bool{}, fmt.Errorf("unable to cast %#v of type %T to []bool", i, i)
|
|
}
|
|
a[j] = val
|
|
}
|
|
return a, nil
|
|
default:
|
|
return []bool{}, fmt.Errorf("unable to cast %#v of type %T to []bool", i, i)
|
|
}
|
|
}
|
|
|
|
// ToStringSliceE casts an interface to a []string type.
|
|
func ToStringSliceE(i interface{}) ([]string, error) {
|
|
var a []string
|
|
|
|
switch v := i.(type) {
|
|
case []interface{}:
|
|
for _, u := range v {
|
|
a = append(a, ToString(u))
|
|
}
|
|
return a, nil
|
|
case []string:
|
|
return v, nil
|
|
case string:
|
|
return strings.Fields(v), nil
|
|
case interface{}:
|
|
str, err := ToStringE(v)
|
|
if err != nil {
|
|
return a, fmt.Errorf("unable to cast %#v of type %T to []string", i, i)
|
|
}
|
|
return []string{str}, nil
|
|
default:
|
|
return a, fmt.Errorf("unable to cast %#v of type %T to []string", i, i)
|
|
}
|
|
}
|
|
|
|
// ToIntSliceE casts an interface to a []int type.
|
|
func ToIntSliceE(i interface{}) ([]int, error) {
|
|
if i == nil {
|
|
return []int{}, fmt.Errorf("unable to cast %#v of type %T to []int", i, i)
|
|
}
|
|
|
|
switch v := i.(type) {
|
|
case []int:
|
|
return v, nil
|
|
}
|
|
|
|
kind := reflect.TypeOf(i).Kind()
|
|
switch kind {
|
|
case reflect.Slice, reflect.Array:
|
|
s := reflect.ValueOf(i)
|
|
a := make([]int, s.Len())
|
|
for j := 0; j < s.Len(); j++ {
|
|
val, err := ToIntE(s.Index(j).Interface())
|
|
if err != nil {
|
|
return []int{}, fmt.Errorf("unable to cast %#v of type %T to []int", i, i)
|
|
}
|
|
a[j] = val
|
|
}
|
|
return a, nil
|
|
default:
|
|
return []int{}, fmt.Errorf("unable to cast %#v of type %T to []int", i, i)
|
|
}
|
|
}
|
|
|
|
// StringToDate attempts to parse a string into a time.Time type using a
|
|
// predefined list of formats. If no suitable format is found, an error is
|
|
// returned.
|
|
func StringToDate(s string) (time.Time, error) {
|
|
return parseDateWith(s, []string{
|
|
time.RFC3339,
|
|
"2006-01-02T15:04:05", // iso8601 without timezone
|
|
time.RFC1123Z,
|
|
time.RFC1123,
|
|
time.RFC822Z,
|
|
time.RFC822,
|
|
time.RFC850,
|
|
time.ANSIC,
|
|
time.UnixDate,
|
|
time.RubyDate,
|
|
"2006-01-02 15:04:05.999999999 -0700 MST", // Time.String()
|
|
"2006-01-02",
|
|
"02 Jan 2006",
|
|
"2006-01-02 15:04:05 -07:00",
|
|
"2006-01-02 15:04:05 -0700",
|
|
"2006-01-02 15:04:05Z07:00", // RFC3339 without T
|
|
"2006-01-02 15:04:05",
|
|
time.Kitchen,
|
|
time.Stamp,
|
|
time.StampMilli,
|
|
time.StampMicro,
|
|
time.StampNano,
|
|
})
|
|
}
|
|
|
|
func parseDateWith(s string, dates []string) (d time.Time, e error) {
|
|
for _, dateType := range dates {
|
|
if d, e = time.Parse(dateType, s); e == nil {
|
|
return
|
|
}
|
|
}
|
|
return d, fmt.Errorf("unable to parse date: %s", s)
|
|
}
|