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author | Wim <wim@42.be> | 2018-03-04 23:46:13 +0100 |
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committer | Wim <wim@42.be> | 2018-03-04 23:46:13 +0100 |
commit | 25a72113b122f984c904b24c4af23a1cba1eff45 (patch) | |
tree | f0fb7067d7c958d60ac964afa5b8d5fb79ebc339 /vendor/github.com/spf13/cast/caste.go | |
parent | 79c4ad5015bd2be47b32141c6d53f0d128bf865b (diff) | |
download | matterbridge-msglm-25a72113b122f984c904b24c4af23a1cba1eff45.tar.gz matterbridge-msglm-25a72113b122f984c904b24c4af23a1cba1eff45.tar.bz2 matterbridge-msglm-25a72113b122f984c904b24c4af23a1cba1eff45.zip |
Add vendor files for spf13/viper
Diffstat (limited to 'vendor/github.com/spf13/cast/caste.go')
-rw-r--r-- | vendor/github.com/spf13/cast/caste.go | 1166 |
1 files changed, 1166 insertions, 0 deletions
diff --git a/vendor/github.com/spf13/cast/caste.go b/vendor/github.com/spf13/cast/caste.go new file mode 100644 index 00000000..4fe19289 --- /dev/null +++ b/vendor/github.com/spf13/cast/caste.go @@ -0,0 +1,1166 @@ +// 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) + } +} + +// 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", + "2006-01-02 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) +} + +// 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) +} |