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Copy pathhelpers.go
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317 lines (250 loc) · 6.36 KB
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package funk
import (
"bytes"
"math/rand"
"reflect"
)
var numericZeros = []interface{}{
int(0),
int8(0),
int16(0),
int32(0),
int64(0),
uint(0),
uint8(0),
uint16(0),
uint32(0),
uint64(0),
float32(0),
float64(0),
}
// ToFloat64 converts any numeric value to float64.
func ToFloat64(x interface{}) (float64, bool) {
var xf float64
xok := true
switch xn := x.(type) {
case uint8:
xf = float64(xn)
case uint16:
xf = float64(xn)
case uint32:
xf = float64(xn)
case uint64:
xf = float64(xn)
case int:
xf = float64(xn)
case int8:
xf = float64(xn)
case int16:
xf = float64(xn)
case int32:
xf = float64(xn)
case int64:
xf = float64(xn)
case float32:
xf = float64(xn)
case float64:
xf = float64(xn)
default:
xok = false
}
return xf, xok
}
// PtrOf makes a copy of the given interface and returns a pointer.
func PtrOf(itf interface{}) interface{} {
t := reflect.TypeOf(itf)
cp := reflect.New(t)
cp.Elem().Set(reflect.ValueOf(itf))
// Avoid double pointers if itf is a pointer
if t.Kind() == reflect.Ptr {
return cp.Elem().Interface()
}
return cp.Interface()
}
// IsFunction returns if the argument is a function.
func IsFunction(in interface{}, num ...int) bool {
funcType := reflect.TypeOf(in)
result := funcType != nil && funcType.Kind() == reflect.Func
if len(num) >= 1 {
result = result && funcType.NumIn() == num[0]
}
if len(num) == 2 {
result = result && funcType.NumOut() == num[1]
}
return result
}
// IsPredicate returns if the argument is a predicate function.
func IsPredicate(in interface{}, inTypes ...reflect.Type) bool {
if len(inTypes) == 0 {
inTypes = append(inTypes, nil)
}
funcType := reflect.TypeOf(in)
result := funcType != nil && funcType.Kind() == reflect.Func
result = result && funcType.NumOut() == 1 && funcType.Out(0).Kind() == reflect.Bool
result = result && funcType.NumIn() == len(inTypes)
for i := 0; result && i < len(inTypes); i++ {
inType := inTypes[i]
result = inType == nil || inType.ConvertibleTo(funcType.In(i))
}
return result
}
// IsEqual returns if the two objects are equal
func IsEqual(expected interface{}, actual interface{}) bool {
if expected == nil || actual == nil {
return expected == actual
}
if exp, ok := expected.([]byte); ok {
act, ok := actual.([]byte)
if !ok {
return false
}
if exp == nil || act == nil {
return true
}
return bytes.Equal(exp, act)
}
return reflect.DeepEqual(expected, actual)
}
// IsType returns if the two objects are in the same type
func IsType(expected interface{}, actual interface{}) bool {
return IsEqual(reflect.TypeOf(expected), reflect.TypeOf(actual))
}
// Equal returns if the two objects are equal
func Equal(expected interface{}, actual interface{}) bool {
return IsEqual(expected, actual)
}
// NotEqual returns if the two objects are not equal
func NotEqual(expected interface{}, actual interface{}) bool {
return !IsEqual(expected, actual)
}
// IsIteratee returns if the argument is an iteratee.
func IsIteratee(in interface{}) bool {
if in == nil {
return false
}
arrType := reflect.TypeOf(in)
kind := arrType.Kind()
return kind == reflect.Array || kind == reflect.Slice || kind == reflect.Map
}
// IsCollection returns if the argument is a collection.
func IsCollection(in interface{}) bool {
arrType := reflect.TypeOf(in)
kind := arrType.Kind()
return kind == reflect.Array || kind == reflect.Slice
}
// SliceOf returns a slice which contains the element.
func SliceOf(in interface{}) interface{} {
value := reflect.ValueOf(in)
sliceType := reflect.SliceOf(reflect.TypeOf(in))
slice := reflect.New(sliceType)
sliceValue := reflect.MakeSlice(sliceType, 0, 0)
sliceValue = reflect.Append(sliceValue, value)
slice.Elem().Set(sliceValue)
return slice.Elem().Interface()
}
// Any returns true if any element of the iterable is not empty. If the iterable is empty, return False.
func Any(objs ...interface{}) bool {
if len(objs) == 0 {
return false
}
for _, obj := range objs {
if !IsEmpty(obj) {
return true
}
}
return false
}
// All returns true if all elements of the iterable are not empty (or if the iterable is empty)
func All(objs ...interface{}) bool {
if len(objs) == 0 {
return true
}
for _, obj := range objs {
if IsEmpty(obj) {
return false
}
}
return true
}
// IsEmpty returns if the object is considered as empty or not.
func IsEmpty(obj interface{}) bool {
if obj == nil || obj == "" || obj == false {
return true
}
for _, v := range numericZeros {
if obj == v {
return true
}
}
objValue := reflect.ValueOf(obj)
switch objValue.Kind() {
case reflect.Map:
fallthrough
case reflect.Slice, reflect.Chan:
return objValue.Len() == 0
case reflect.Struct:
return reflect.DeepEqual(obj, ZeroOf(obj))
case reflect.Ptr:
if objValue.IsNil() {
return true
}
obj = redirectValue(objValue).Interface()
return reflect.DeepEqual(obj, ZeroOf(obj))
}
return false
}
// IsZero returns if the object is considered as zero value
func IsZero(obj interface{}) bool {
if obj == nil || obj == "" || obj == false {
return true
}
for _, v := range numericZeros {
if obj == v {
return true
}
}
return reflect.DeepEqual(obj, ZeroOf(obj))
}
// NotEmpty returns if the object is considered as non-empty or not.
func NotEmpty(obj interface{}) bool {
return !IsEmpty(obj)
}
// ZeroOf returns a zero value of an element.
func ZeroOf(in interface{}) interface{} {
if in == nil {
return nil
}
return reflect.Zero(reflect.TypeOf(in)).Interface()
}
// RandomInt generates a random int, based on a min and max values
func RandomInt(min, max int) int {
return min + rand.Intn(max-min)
}
// Shard will shard a string name
func Shard(str string, width int, depth int, restOnly bool) []string {
var results []string
for i := 0; i < depth; i++ {
results = append(results, str[(width*i):(width*(i+1))])
}
if restOnly {
results = append(results, str[(width*depth):])
} else {
results = append(results, str)
}
return results
}
var defaultLetters = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")
// RandomString returns a random string with a fixed length
func RandomString(n int, allowedChars ...[]rune) string {
var letters []rune
if len(allowedChars) == 0 {
letters = defaultLetters
} else {
letters = allowedChars[0]
}
b := make([]rune, n)
for i := range b {
b[i] = letters[rand.Intn(len(letters))]
}
return string(b)
}