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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// A package of simple functions to manipulate strings.
package strings
import "utf8"
// Explode splits s into an array of UTF-8 sequences, one per Unicode character (still strings).
// Invalid UTF-8 sequences become correct encodings of U+FFF8.
func Explode(s string) []string {
a := make([]string, utf8.RuneCountInString(s, 0, len(s)));
j := 0;
var size, rune int;
for i := 0; i < len(a); i++ {
rune, size = utf8.DecodeRuneInString(s, j);
a[i] = string(rune);
j += size;
}
return a
}
// Count counts the number of non-overlapping instances of sep in s.
func Count(s, sep string) int {
if sep == "" {
return utf8.RuneCountInString(s, 0, len(s))+1
}
c := sep[0];
n := 0;
for i := 0; i+len(sep) <= len(s); i++ {
if s[i] == c && (len(sep) == 1 || s[i:i+len(sep)] == sep) {
n++;
i += len(sep)-1
}
}
return n
}
// Index returns the index of the first instance of sep in s.
func Index(s, sep string) int {
if sep == "" {
return 0
}
c := sep[0];
for i := 0; i+len(sep) <= len(s); i++ {
if s[i] == c && (len(sep) == 1 || s[i:i+len(sep)] == sep) {
return i
}
}
return -1
}
// Split returns the array representing the substrings of s separated by string sep. Adjacent
// occurrences of sep produce empty substrings. If sep is empty, it is the same as Explode.
func Split(s, sep string) []string {
if sep == "" {
return Explode(s)
}
c := sep[0];
start := 0;
n := Count(s, sep)+1;
a := make([]string, n);
na := 0;
for i := 0; i+len(sep) <= len(s); i++ {
if s[i] == c && (len(sep) == 1 || s[i:i+len(sep)] == sep) {
a[na] = s[start:i];
na++;
start = i+len(sep);
i += len(sep)-1
}
}
a[na] = s[start:len(s)];
return a
}
// Join concatenates the elements of a to create a single string. The separator string
// sep is placed between elements in the resulting string.
func Join(a []string, sep string) string {
if len(a) == 0 {
return ""
}
if len(a) == 1 {
return a[0]
}
n := len(sep) * (len(a)-1);
for i := 0; i < len(a); i++ {
n += len(a[i])
}
b := make([]byte, n);
bp := 0;
for i := 0; i < len(a); i++ {
s := a[i];
for j := 0; j < len(s); j++ {
b[bp] = s[j];
bp++
}
if i + 1 < len(a) {
s = sep;
for j := 0; j < len(s); j++ {
b[bp] = s[j];
bp++
}
}
}
return string(b)
}
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