forked from mirror/glob
129 lines
2.0 KiB
Go
129 lines
2.0 KiB
Go
package runes
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func Index(s, needle []rune) int {
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ls, ln := len(s), len(needle)
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switch {
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case ln == 0:
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return 0
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case ln == 1:
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return IndexRune(s, needle[0])
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case ln == ls:
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if Equal(s, needle) {
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return 0
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}
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return -1
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case ln > ls:
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return -1
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}
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head:
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for i := 0; i < ls && ls-i >= ln; i++ {
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for y := 0; y < ln; y++ {
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if s[i+y] != needle[y] {
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continue head
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}
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}
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return i
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}
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return -1
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}
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func LastIndex(s, needle []rune) int {
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ls, ln := len(s), len(needle)
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switch {
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case ln == 0:
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if ls == 0 {
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return 0
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}
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return ls
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case ln == 1:
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return IndexLastRune(s, needle[0])
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case ln == ls:
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if Equal(s, needle) {
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return 0
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}
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return -1
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case ln > ls:
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return -1
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}
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head:
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for i := ls - 1; i >= 0 && i >= ln; i-- {
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for y := ln - 1; y >= 0; y-- {
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if s[i-(ln-y-1)] != needle[y] {
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continue head
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}
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}
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return i - ln + 1
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}
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return -1
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}
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// IndexAny returns the index of the first instance of any Unicode code point
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// from chars in s, or -1 if no Unicode code point from chars is present in s.
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func IndexAny(s, chars []rune) int {
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if len(chars) > 0 {
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for i, c := range s {
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for _, m := range chars {
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if c == m {
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return i
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}
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}
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}
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}
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return -1
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}
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func Contains(s, needle []rune) bool {
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return Index(s, needle) >= 0
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}
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func IndexRune(s []rune, r rune) int {
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for i, c := range s {
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if c == r {
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return i
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}
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}
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return -1
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}
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func IndexLastRune(s []rune, r rune) int {
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for i := len(s) - 1; i >= 0; i-- {
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if s[i] == r {
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return i
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}
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}
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return -1
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}
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func Equal(a, b []rune) bool {
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if len(a) == len(b) {
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for i := 0; i < len(a); i++ {
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if a[i] != b[i] {
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return false
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}
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}
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return true
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}
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return false
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}
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// HasPrefix tests whether the string s begins with prefix.
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func HasPrefix(s, prefix []rune) bool {
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return len(s) >= len(prefix) && Equal(s[0:len(prefix)], prefix)
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}
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// HasSuffix tests whether the string s ends with suffix.
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func HasSuffix(s, suffix []rune) bool {
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return len(s) >= len(suffix) && Equal(s[len(s)-len(suffix):], suffix)
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}
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