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strings.go
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strings.go
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package util
import (
"encoding/hex"
"fmt"
"math/rand"
"regexp"
"sort"
"strconv"
"strings"
"time"
"github.com/pkg/errors"
)
//DisallowedLabelCharacters regex of chars not allowed in lables
var DisallowedLabelCharacters = regexp.MustCompile("[^a-z0-9-]")
// RegexpSplit splits a string into an array using the regexSep as a separator
func RegexpSplit(text string, regexSeperator string) []string {
reg := regexp.MustCompile(regexSeperator)
indexes := reg.FindAllStringIndex(text, -1)
lastIdx := 0
result := make([]string, len(indexes)+1)
for i, element := range indexes {
result[i] = text[lastIdx:element[0]]
lastIdx = element[1]
}
result[len(indexes)] = text[lastIdx:]
return result
}
// StringIndexes returns all the indices where the value occurs in the given string
func StringIndexes(text string, value string) []int {
answer := []int{}
t := text
valueLen := len(value)
offset := 0
for {
idx := strings.Index(t, value)
if idx < 0 {
break
}
answer = append(answer, idx+offset)
offset += valueLen
t = t[idx+valueLen:]
}
return answer
}
// StringArrayIndex returns the index in the slice which equals the given value
func StringArrayIndex(array []string, value string) int {
for i, v := range array {
if v == value {
return i
}
}
return -1
}
// StringArrayHasPrefixIndex returns the index in the slice which the value has the given prefix
func StringArrayHasPrefixIndex(array []string, prefix string) int {
for i, v := range array {
if strings.HasPrefix(v, prefix) {
return i
}
}
return -1
}
// StringArraysEqual returns true if the two string slices are equal
func StringArraysEqual(a1 []string, a2 []string) bool {
if len(a1) != len(a2) {
return false
}
for i := 0; i < len(a1); i++ {
if a1[i] != a2[i] {
return false
}
}
return true
}
// FirstNotEmptyString returns the first non empty string or the empty string if none can be found
func FirstNotEmptyString(values ...string) string {
if values != nil {
for _, v := range values {
if v != "" {
return v
}
}
}
return ""
}
// SortedMapKeys returns the sorted keys of the given map
func SortedMapKeys(m map[string]string) []string {
answer := []string{}
for k := range m {
answer = append(answer, k)
}
sort.Strings(answer)
return answer
}
func ReverseStrings(a []string) {
for i, j := 0, len(a)-1; i < j; i, j = i+1, j-1 {
a[i], a[j] = a[j], a[i]
}
}
// StringArrayToLower returns a string slice with all the values converted to lower case
func StringArrayToLower(values []string) []string {
answer := []string{}
for _, v := range values {
answer = append(answer, strings.ToLower(v))
}
return answer
}
// StringContainsAny returns true if the given text contains the includes/excludes lists
func StringContainsAny(text string, includes []string, excludes []string) bool {
for _, x := range excludes {
if strings.Index(text, x) >= 0 {
return false
}
}
if len(includes) == 0 {
return true
}
for _, inc := range includes {
if strings.Index(text, inc) >= 0 {
return true
}
}
return false
}
// StringMatchesAny returns true if the given text matches the includes/excludes lists
func StringMatchesAny(text string, includes []string, excludes []string) bool {
for _, x := range excludes {
if StringMatchesPattern(text, x) {
return false
}
}
if len(includes) == 0 {
return true
}
for _, inc := range includes {
if StringMatchesPattern(text, inc) {
return true
}
}
return false
}
// StringMatchesPattern returns true if the given text matches the includes/excludes lists
func StringMatchesPattern(text string, pattern string) bool {
if pattern == "*" {
return true
}
if strings.HasSuffix(pattern, "*") {
prefix := strings.TrimSuffix(pattern, "*")
return strings.HasPrefix(text, prefix)
}
return text == pattern
}
// StringsContaining if the filter is not empty return all the strings which contain the text
func StringsContaining(slice []string, filter string) []string {
if filter == "" {
return slice
}
answer := []string{}
for _, text := range slice {
if strings.Contains(text, filter) {
answer = append(answer, text)
}
}
return answer
}
// RandStringBytesMaskImprSrc returns a random hexadecimal string of length n.
func RandStringBytesMaskImprSrc(n int) (string, error) {
src := rand.New(rand.NewSource(time.Now().UnixNano()))
b := make([]byte, (n+1)/2) // can be simplified to n/2 if n is always even
if _, err := src.Read(b); err != nil {
return "", err
}
return hex.EncodeToString(b)[:n], nil
}
// DiffSlices compares the two slices and returns an array of items to delete from the old slice and a slice of
// new values to add to
func DiffSlices(oldSlice []string, newSlice []string) ([]string, []string) {
toDelete := []string{}
toInsert := []string{}
for _, name := range oldSlice {
if StringArrayIndex(newSlice, name) < 0 {
toDelete = append(toDelete, name)
}
}
for _, name := range newSlice {
if StringArrayIndex(oldSlice, name) < 0 {
toInsert = append(toInsert, name)
}
}
return toDelete, toInsert
}
// ParseBool parses the boolean string. Returns false if the string is empty
func ParseBool(text string) (bool, error) {
if text == "" {
return false, nil
}
return strconv.ParseBool(text)
}
// CheckMark returns the check mark unicode character.
// We could configure this to use no color or avoid unicode using platform, env vars or config?
func CheckMark() string {
return "\u2705"
}
// RemoveStringFromSlice removes the first occurrence of the specified string from a slice, if it exists and returns the result
func RemoveStringFromSlice(strings []string, toRemove string) []string {
for i, str := range strings {
if str == toRemove {
return append(strings[:i], strings[i+1:]...)
}
}
return strings
}
// YesNo returns a Yes/No conversion for a boolean parameter
func YesNo(t bool) string {
if t {
return "Yes"
}
return "No"
}
// ExtractKeyValuePairs creates a map of an string array assuming that each array element is of the form <key><sep><value>.
// An error is returned is a array element cannot be split into a key/value pair using the specified separator.
func ExtractKeyValuePairs(values []string, sep string) (map[string]string, error) {
pairs := make(map[string]string)
for _, value := range values {
parts := strings.Split(value, sep)
if len(parts) != 2 {
return map[string]string{}, errors.Errorf("expected 2 parts for key value pair '%s', but got %v", value, len(parts))
}
pairs[parts[0]] = parts[1]
}
return pairs, nil
}
// QuestionAnswer returns strings like Cobra question/answers for default cli options
func QuestionAnswer(question string, answer string) string {
return fmt.Sprintf("%s %s: %s", ColorBold(ColorInfo("?")), ColorBold(question), ColorAnswer(answer))
}
//SanitizeLabel returns a label with disallowed characters removed
func SanitizeLabel(label string) string {
sanitized := strings.ToLower(label)
return DisallowedLabelCharacters.ReplaceAllString(sanitized, "-")
}
// StripTrailingSlash removes any trailing forward slashes on the URL
func StripTrailingSlash(url string) string {
if url[len(url)-1:] == "/" {
return url[0 : len(url)-1]
}
return url
}
// StartsWith returns true if the string starts with the given substring
func StartsWith(s, substr string) bool {
return strings.Index(s, substr) == 0
}
// ToCamelCase turn "my-super-name" into "MySuperName"
// Usefule for creating valid go-template variable names
func ToCamelCase(s string) string {
return strings.Replace(strings.Title(s), "-", "", -1)
}