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// Copyright © 2014 Steve Francia <spf@spf13.com>.
//
// Use of this source code is governed by an MIT-style
// license that can be found in the LICENSE file.
package cast
import (
"encoding/json"
"errors"
"fmt"
"html/template"
"reflect"
"strconv"
"strings"
"time"
)
var errNegativeNotAllowed = errors.New("unable to cast negative value")
// ToTimeE casts an interface to a time.Time type.
func ToTimeE(i interface{}) (tim time.Time, err error) {
i = indirect(i)
switch v := i.(type) {
case time.Time:
return v, nil
case string:
return StringToDate(v)
case int:
return time.Unix(int64(v), 0), nil
case int64:
return time.Unix(v, 0), nil
case int32:
return time.Unix(int64(v), 0), nil
case uint:
return time.Unix(int64(v), 0), nil
case uint64:
return time.Unix(int64(v), 0), nil
case uint32:
return time.Unix(int64(v), 0), nil
default:
return time.Time{}, fmt.Errorf("unable to cast %#v of type %T to Time", i, i)
}
}
// ToDurationE casts an interface to a time.Duration type.
func ToDurationE(i interface{}) (d time.Duration, err error) {
i = indirect(i)
switch s := i.(type) {
case time.Duration:
return s, nil
case int, int64, int32, int16, int8, uint, uint64, uint32, uint16, uint8:
d = time.Duration(ToInt64(s))
return
case float32, float64:
d = time.Duration(ToFloat64(s))
return
case string:
if strings.ContainsAny(s, "nsuµmh") {
d, err = time.ParseDuration(s)
} else {
d, err = time.ParseDuration(s + "ns")
}
return
default:
err = fmt.Errorf("unable to cast %#v of type %T to Duration", i, i)
return
}
}
// ToBoolE casts an interface to a bool type.
func ToBoolE(i interface{}) (bool, error) {
i = indirect(i)
switch b := i.(type) {
case bool:
return b, nil
case nil:
return false, nil
case int:
if i.(int) != 0 {
return true, nil
}
return false, nil
case string:
return strconv.ParseBool(i.(string))
default:
return false, fmt.Errorf("unable to cast %#v of type %T to bool", i, i)
}
}
// ToFloat64E casts an interface to a float64 type.
func ToFloat64E(i interface{}) (float64, error) {
i = indirect(i)
switch s := i.(type) {
case float64:
return s, nil
case float32:
return float64(s), nil
case int:
return float64(s), nil
case int64:
return float64(s), nil
case int32:
return float64(s), nil
case int16:
return float64(s), nil
case int8:
return float64(s), nil
case uint:
return float64(s), nil
case uint64:
return float64(s), nil
case uint32:
return float64(s), nil
case uint16:
return float64(s), nil
case uint8:
return float64(s), nil
case string:
v, err := strconv.ParseFloat(s, 64)
if err == nil {
return v, nil
}
return 0, fmt.Errorf("unable to cast %#v of type %T to float64", i, i)
case bool:
if s {
return 1, nil
}
return 0, nil
default:
return 0, fmt.Errorf("unable to cast %#v of type %T to float64", i, i)
}
}
// ToFloat32E casts an interface to a float32 type.
func ToFloat32E(i interface{}) (float32, error) {
i = indirect(i)
switch s := i.(type) {
case float64:
return float32(s), nil
case float32:
return s, nil
case int:
return float32(s), nil
case int64:
return float32(s), nil
case int32:
return float32(s), nil
case int16:
return float32(s), nil
case int8:
return float32(s), nil
case uint:
return float32(s), nil
case uint64:
return float32(s), nil
case uint32:
return float32(s), nil
case uint16:
return float32(s), nil
case uint8:
return float32(s), nil
case string:
v, err := strconv.ParseFloat(s, 32)
if err == nil {
return float32(v), nil
}
return 0, fmt.Errorf("unable to cast %#v of type %T to float32", i, i)
case bool:
if s {
return 1, nil
}
return 0, nil
default:
return 0, fmt.Errorf("unable to cast %#v of type %T to float32", i, i)
}
}
// ToInt64E casts an interface to an int64 type.
func ToInt64E(i interface{}) (int64, error) {
i = indirect(i)
switch s := i.(type) {
case int:
return int64(s), nil
case int64:
return s, nil
case int32:
return int64(s), nil
case int16:
return int64(s), nil
case int8:
return int64(s), nil
case uint:
return int64(s), nil
case uint64:
return int64(s), nil
case uint32:
return int64(s), nil
case uint16:
return int64(s), nil
case uint8:
return int64(s), nil
case float64:
return int64(s), nil
case float32:
return int64(s), nil
case string:
v, err := strconv.ParseInt(s, 0, 0)
if err == nil {
return v, nil
}
return 0, fmt.Errorf("unable to cast %#v of type %T to int64", i, i)
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 int64", i, i)
}
}
// ToInt32E casts an interface to an int32 type.
func ToInt32E(i interface{}) (int32, error) {
i = indirect(i)
switch s := i.(type) {
case int:
return int32(s), nil
case int64:
return int32(s), nil
case int32:
return s, nil
case int16:
return int32(s), nil
case int8:
return int32(s), nil
case uint:
return int32(s), nil
case uint64:
return int32(s), nil
case uint32:
return int32(s), nil
case uint16:
return int32(s), nil
case uint8:
return int32(s), nil
case float64:
return int32(s), nil
case float32:
return int32(s), nil
case string:
v, err := strconv.ParseInt(s, 0, 0)
if err == nil {
return int32(v), nil
}
return 0, fmt.Errorf("unable to cast %#v of type %T to int32", i, i)
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 int32", i, i)
}
}
// ToInt16E casts an interface to an int16 type.
func ToInt16E(i interface{}) (int16, error) {
i = indirect(i)
switch s := i.(type) {
case int:
return int16(s), nil
case int64:
return int16(s), nil
case int32:
return int16(s), nil
case int16:
return s, nil
case int8:
return int16(s), nil
case uint:
return int16(s), nil
case uint64:
return int16(s), nil
case uint32:
return int16(s), nil
case uint16:
return int16(s), nil
case uint8:
return int16(s), nil
case float64:
return int16(s), nil
case float32:
return int16(s), nil
case string:
v, err := strconv.ParseInt(s, 0, 0)
if err == nil {
return int16(v), nil
}
return 0, fmt.Errorf("unable to cast %#v of type %T to int16", i, i)
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 int16", i, i)
}
}
// ToInt8E casts an interface to an int8 type.
func ToInt8E(i interface{}) (int8, error) {
i = indirect(i)
switch s := i.(type) {
case int:
return int8(s), nil
case int64:
return int8(s), nil
case int32:
return int8(s), nil
case int16:
return int8(s), nil
case int8:
return s, nil
case uint:
return int8(s), nil
case uint64:
return int8(s), nil
case uint32:
return int8(s), nil
case uint16:
return int8(s), nil
case uint8:
return int8(s), nil
case float64:
return int8(s), nil
case float32:
return int8(s), nil
case string:
v, err := strconv.ParseInt(s, 0, 0)
if err == nil {
return int8(v), nil
}
return 0, fmt.Errorf("unable to cast %#v of type %T to int8", i, i)
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 int8", i, i)
}
}
// ToIntE casts an interface to an int type.
func ToIntE(i interface{}) (int, error) {
i = indirect(i)
switch s := i.(type) {
case int:
return s, nil
case int64:
return int(s), nil
case int32:
return int(s), nil
case int16:
return int(s), nil
case int8:
return int(s), nil
case uint:
return int(s), nil
case uint64:
return int(s), nil
case uint32:
return int(s), nil
case uint16:
return int(s), nil
case uint8:
return int(s), nil
case float64:
return int(s), nil
case float32:
return int(s), nil
case string:
v, err := strconv.ParseInt(s, 0, 0)
if err == nil {
return int(v), nil
}
return 0, fmt.Errorf("unable to cast %#v of type %T to int", i, i)
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 int", i, i)
}
}
// ToUintE casts an interface to a uint type.
func ToUintE(i interface{}) (uint, error) {
i = indirect(i)
switch s := i.(type) {
case string:
v, err := strconv.ParseUint(s, 0, 0)
if err == nil {
return uint(v), nil
}
return 0, fmt.Errorf("unable to cast %#v to uint: %s", i, err)
case int:
if s < 0 {
return 0, errNegativeNotAllowed
}
return uint(s), nil
case int64:
if s < 0 {
return 0, errNegativeNotAllowed
}
return uint(s), nil
case int32:
if s < 0 {
return 0, errNegativeNotAllowed
}
return uint(s), nil
case int16:
if s < 0 {
return 0, errNegativeNotAllowed
}
return uint(s), nil
case int8:
if s < 0 {
return 0, errNegativeNotAllowed
}
return uint(s), nil
case uint:
return s, nil
case uint64:
return uint(s), nil
case uint32:
return uint(s), nil
case uint16:
return uint(s), nil
case uint8:
return uint(s), nil
case float64:
if s < 0 {
return 0, errNegativeNotAllowed
}
return uint(s), nil
case float32:
if s < 0 {
return 0, errNegativeNotAllowed
}
return uint(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 uint", i, i)
}
}
// ToUint64E casts an interface to a uint64 type.
func ToUint64E(i interface{}) (uint64, error) {
i = indirect(i)
switch s := i.(type) {
case string:
v, err := strconv.ParseUint(s, 0, 64)
if err == nil {
return v, nil
}
return 0, fmt.Errorf("unable to cast %#v to uint64: %s", i, err)
case int:
if s < 0 {
return 0, errNegativeNotAllowed
}
return uint64(s), nil
case int64:
if s < 0 {
return 0, errNegativeNotAllowed
}
return uint64(s), nil
case int32:
if s < 0 {
return 0, errNegativeNotAllowed
}
return uint64(s), nil
case int16:
if s < 0 {
return 0, errNegativeNotAllowed
}
return uint64(s), nil
case int8:
if s < 0 {
return 0, errNegativeNotAllowed
}
return uint64(s), nil
case uint:
return uint64(s), nil
case uint64:
return s, nil
case uint32:
return uint64(s), nil
case uint16:
return uint64(s), nil
case uint8:
return uint64(s), nil
case float32:
if s < 0 {
return 0, errNegativeNotAllowed
}
return uint64(s), nil
case float64:
if s < 0 {
return 0, errNegativeNotAllowed
}
return uint64(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 uint64", i, i)
}
}
// ToUint32E casts an interface to a uint32 type.
func ToUint32E(i interface{}) (uint32, error) {
i = indirect(i)
switch s := i.(type) {
case string:
v, err := strconv.ParseUint(s, 0, 32)
if err == nil {
return uint32(v), nil
}
return 0, fmt.Errorf("unable to cast %#v to uint32: %s", i, err)
case int:
if s < 0 {
return 0, errNegativeNotAllowed
}
return uint32(s), nil
case int64:
if s < 0 {
return 0, errNegativeNotAllowed
}
return uint32(s), nil
case int32:
if s < 0 {
return 0, errNegativeNotAllowed
}
return uint32(s), nil
case int16:
if s < 0 {
return 0, errNegativeNotAllowed
}
return uint32(s), nil
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
case string:
err := jsonStringToObject(v, &m)
return m, err
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
}
case string:
err := jsonStringToObject(v, &m)
return m, err
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
case string:
err := jsonStringToObject(v, &m)
return m, err
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
case string:
err := jsonStringToObject(v, &m)
return m, err
default:
return m, fmt.Errorf("unable to cast %#v of type %T to map[string]interface{}", i, i)
}
}
// ToStringMapIntE casts an interface to a map[string]int{} type.
func ToStringMapIntE(i interface{}) (map[string]int, error) {
var m = map[string]int{}
if i == nil {
return m, fmt.Errorf("unable to cast %#v of type %T to map[string]int", i, i)
}
switch v := i.(type) {
case map[interface{}]interface{}:
for k, val := range v {
m[ToString(k)] = ToInt(val)
}
return m, nil
case map[string]interface{}:
for k, val := range v {
m[k] = ToInt(val)
}
return m, nil
case map[string]int:
return v, nil
case string:
err := jsonStringToObject(v, &m)
return m, err
}
if reflect.TypeOf(i).Kind() != reflect.Map {
return m, fmt.Errorf("unable to cast %#v of type %T to map[string]int", i, i)
}
mVal := reflect.ValueOf(m)
v := reflect.ValueOf(i)
for _, keyVal := range v.MapKeys() {
val, err := ToIntE(v.MapIndex(keyVal).Interface())
if err != nil {
return m, fmt.Errorf("unable to cast %#v of type %T to map[string]int", i, i)
}
mVal.SetMapIndex(keyVal, reflect.ValueOf(val))
}
return m, nil
}
// ToStringMapInt64E casts an interface to a map[string]int64{} type.
func ToStringMapInt64E(i interface{}) (map[string]int64, error) {
var m = map[string]int64{}
if i == nil {
return m, fmt.Errorf("unable to cast %#v of type %T to map[string]int64", i, i)
}
switch v := i.(type) {
case map[interface{}]interface{}:
for k, val := range v {
m[ToString(k)] = ToInt64(val)
}
return m, nil
case map[string]interface{}:
for k, val := range v {
m[k] = ToInt64(val)
}
return m, nil
case map[string]int64:
return v, nil
case string:
err := jsonStringToObject(v, &m)
return m, err
}
if reflect.TypeOf(i).Kind() != reflect.Map {
return m, fmt.Errorf("unable to cast %#v of type %T to map[string]int64", i, i)
}
mVal := reflect.ValueOf(m)
v := reflect.ValueOf(i)
for _, keyVal := range v.MapKeys() {
val, err := ToInt64E(v.MapIndex(keyVal).Interface())
if err != nil {
return m, fmt.Errorf("unable to cast %#v of type %T to map[string]int64", i, i)
}
mVal.SetMapIndex(keyVal, reflect.ValueOf(val))
}
return m, nil
}
// 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)
}
}
// ToDurationSliceE casts an interface to a []time.Duration type.
func ToDurationSliceE(i interface{}) ([]time.Duration, error) {
if i == nil {
return []time.Duration{}, fmt.Errorf("unable to cast %#v of type %T to []time.Duration", i, i)
}
switch v := i.(type) {
case []time.Duration:
return v, nil
}
kind := reflect.TypeOf(i).Kind()
switch kind {
case reflect.Slice, reflect.Array:
s := reflect.ValueOf(i)
a := make([]time.Duration, s.Len())
for j := 0; j < s.Len(); j++ {
val, err := ToDurationE(s.Index(j).Interface())
if err != nil {
return []time.Duration{}, fmt.Errorf("unable to cast %#v of type %T to []time.Duration", i, i)
}
a[j] = val
}
return a, nil
default:
return []time.Duration{}, fmt.Errorf("unable to cast %#v of type %T to []time.Duration", 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",
"2006-01-02T15:04:05-0700", // RFC3339 without timezone hh:mm colon
"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 15:04:05Z0700", // RFC3339 without T or timezone hh:mm colon
"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)
}
// jsonStringToObject attempts to unmarshall a string as JSON into
// the object passed as pointer.
func jsonStringToObject(s string, v interface{}) error {
data := []byte(s)
return json.Unmarshal(data, v)
}
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