terraform/vendor/github.com/likexian/gokit/assert/values.go

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/*
* Copyright 2012-2019 Li Kexian
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* A toolkit for Golang development
* https://www.likexian.com/
*/
package assert
import (
"errors"
"fmt"
"reflect"
"regexp"
"strconv"
"strings"
)
// ErrInvalid is value invalid for operation
var ErrInvalid = errors.New("value if invalid")
// ErrLess is expect to be greater error
var ErrLess = errors.New("left is less the right")
// ErrGreater is expect to be less error
var ErrGreater = errors.New("left is greater then right")
// CMP is compare operation
var CMP = struct {
LT string
LE string
GT string
GE string
}{
"<",
"<=",
">",
">=",
}
// IsZero returns value is zero value
func IsZero(v interface{}) bool {
vv := reflect.ValueOf(v)
switch vv.Kind() {
case reflect.Invalid:
return true
case reflect.Bool:
return !vv.Bool()
case reflect.Ptr, reflect.Interface:
return vv.IsNil()
case reflect.Array, reflect.Slice, reflect.Map, reflect.String:
return vv.Len() == 0
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return vv.Int() == 0
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return vv.Uint() == 0
case reflect.Float32, reflect.Float64:
return vv.Float() == 0
default:
return false
}
}
// IsContains returns whether value is within array
func IsContains(array interface{}, value interface{}) bool {
vv := reflect.ValueOf(array)
if vv.Kind() == reflect.Ptr || vv.Kind() == reflect.Interface {
if vv.IsNil() {
return false
}
vv = vv.Elem()
}
switch vv.Kind() {
case reflect.Invalid:
return false
case reflect.Slice:
for i := 0; i < vv.Len(); i++ {
if reflect.DeepEqual(value, vv.Index(i).Interface()) {
return true
}
}
return false
case reflect.Map:
s := vv.MapKeys()
for i := 0; i < len(s); i++ {
if reflect.DeepEqual(value, s[i].Interface()) {
return true
}
}
return false
case reflect.String:
ss := reflect.ValueOf(value)
switch ss.Kind() {
case reflect.String:
return strings.Contains(vv.String(), ss.String())
}
return false
default:
return reflect.DeepEqual(array, value)
}
}
// IsMatch returns if value v contains any match of pattern r
// IsMatch(regexp.MustCompile("v\d+"), "v100")
// IsMatch("v\d+", "v100")
// IsMatch("\d+\.\d+", 100.1)
func IsMatch(r interface{}, v interface{}) bool {
var re *regexp.Regexp
if v, ok := r.(*regexp.Regexp); ok {
re = v
} else {
re = regexp.MustCompile(fmt.Sprint(r))
}
return re.MatchString(fmt.Sprint(v))
}
// Length returns length of value
func Length(v interface{}) int {
vv := reflect.ValueOf(v)
if vv.Kind() == reflect.Ptr || vv.Kind() == reflect.Interface {
if vv.IsNil() {
return 0
}
vv = vv.Elem()
}
switch vv.Kind() {
case reflect.Invalid:
return 0
case reflect.Ptr, reflect.Interface:
return 0
case reflect.Array, reflect.Slice, reflect.Map, reflect.String:
return vv.Len()
default:
return len(fmt.Sprintf("%#v", v))
}
}
// IsLt returns if x less than y, value invalid will returns false
func IsLt(x, y interface{}) bool {
return Compare(x, y, CMP.LT) == nil
}
// IsLe returns if x less than or equal to y, value invalid will returns false
func IsLe(x, y interface{}) bool {
return Compare(x, y, CMP.LE) == nil
}
// IsGt returns if x greater than y, value invalid will returns false
func IsGt(x, y interface{}) bool {
return Compare(x, y, CMP.GT) == nil
}
// IsGe returns if x greater than or equal to y, value invalid will returns false
func IsGe(x, y interface{}) bool {
return Compare(x, y, CMP.GE) == nil
}
// Compare compare x and y, by operation
// It returns nil for true, ErrInvalid for invalid operation, err for false
// Compare(1, 2, ">") // number compare -> true
// Compare("a", "a", ">=") // string compare -> true
// Compare([]string{"a", "b"}, []string{"a"}, "<") // slice len compare -> false
func Compare(x, y interface{}, op string) error {
if !IsContains([]string{CMP.LT, CMP.LE, CMP.GT, CMP.GE}, op) {
return ErrInvalid
}
vv := reflect.ValueOf(x)
if vv.Kind() == reflect.Ptr || vv.Kind() == reflect.Interface {
if vv.IsNil() {
return ErrInvalid
}
vv = vv.Elem()
}
var c float64
switch vv.Kind() {
case reflect.Invalid:
return ErrInvalid
case reflect.String:
yy := reflect.ValueOf(y)
switch yy.Kind() {
case reflect.String:
c = float64(strings.Compare(vv.String(), yy.String()))
default:
return ErrInvalid
}
case reflect.Slice, reflect.Map, reflect.Array:
yy := reflect.ValueOf(y)
switch yy.Kind() {
case reflect.Slice, reflect.Map, reflect.Array:
c = float64(vv.Len() - yy.Len())
default:
return ErrInvalid
}
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
yy, err := ToInt64(y)
if err != nil {
return ErrInvalid
}
c = float64(vv.Int() - yy)
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
yy, err := ToUint64(y)
if err != nil {
return ErrInvalid
}
c = float64(vv.Uint()) - float64(yy)
case reflect.Float32, reflect.Float64:
yy, err := ToFloat64(y)
if err != nil {
return ErrInvalid
}
c = float64(vv.Float() - yy)
default:
return ErrInvalid
}
switch {
case c < 0:
switch op {
case CMP.LT, CMP.LE:
return nil
default:
return ErrLess
}
case c > 0:
switch op {
case CMP.GT, CMP.GE:
return nil
default:
return ErrGreater
}
default:
switch op {
case CMP.LT:
return ErrGreater
case CMP.GT:
return ErrLess
default:
return nil
}
}
}
// ToInt64 returns int value for int or uint or float
func ToInt64(v interface{}) (int64, error) {
vv := reflect.ValueOf(v)
switch vv.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return int64(vv.Int()), nil
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return int64(vv.Uint()), nil
case reflect.Float32, reflect.Float64:
return int64(vv.Float()), nil
case reflect.String:
r, err := strconv.ParseInt(vv.String(), 10, 64)
if err != nil {
return 0, ErrInvalid
}
return r, nil
default:
return 0, ErrInvalid
}
}
// ToUint64 returns uint value for int or uint or float
func ToUint64(v interface{}) (uint64, error) {
vv := reflect.ValueOf(v)
switch vv.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return uint64(vv.Int()), nil
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return uint64(vv.Uint()), nil
case reflect.Float32, reflect.Float64:
return uint64(vv.Float()), nil
case reflect.String:
r, err := strconv.ParseUint(vv.String(), 10, 64)
if err != nil {
return 0, ErrInvalid
}
return r, nil
default:
return 0, ErrInvalid
}
}
// ToFloat64 returns float64 value for int or uint or float
func ToFloat64(v interface{}) (float64, error) {
vv := reflect.ValueOf(v)
switch vv.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return float64(vv.Int()), nil
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return float64(vv.Uint()), nil
case reflect.Float32, reflect.Float64:
return float64(vv.Float()), nil
case reflect.String:
r, err := strconv.ParseFloat(vv.String(), 64)
if err != nil {
return 0, ErrInvalid
}
return r, nil
default:
return 0, ErrInvalid
}
}
// If returns x if c is true, else y
// z = If(c, x, y)
// equal to:
// z = c ? x : y
func If(c bool, x, y interface{}) interface{} {
if c {
return x
}
return y
}