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document strings

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R=rsc
DELTA=9  (4 added, 0 deleted, 5 changed)
OCL=25793
CL=25795
This commit is contained in:
Rob Pike 2009-03-05 17:02:34 -08:00
parent 63985b489b
commit 0f7306b78c
1 changed files with 9 additions and 5 deletions
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14
src/lib/strings.go
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@ -2,11 +2,13 @@
// Use of this source code is governed by a BSD-style // Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file. // license that can be found in the LICENSE file.
// A package of simple functions to manipulate strings.
package strings package strings
import "utf8" import "utf8"
// Split string into array of UTF-8 sequences (still strings) // 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 { func Explode(s string) []string {
a := make([]string, utf8.RuneCountInString(s, 0, len(s))); a := make([]string, utf8.RuneCountInString(s, 0, len(s)));
j := 0; j := 0;
@ -19,7 +21,7 @@ func Explode(s string) []string {
return a return a
} }
// Count non-overlapping instances of sep in s. // Count counts the number of non-overlapping instances of sep in s.
func Count(s, sep string) int { func Count(s, sep string) int {
if sep == "" { if sep == "" {
return utf8.RuneCountInString(s, 0, len(s))+1 return utf8.RuneCountInString(s, 0, len(s))+1
@ -35,7 +37,7 @@ func Count(s, sep string) int {
return n return n
} }
// Return index of first instance of sep in s. // Index returns the index of the first instance of sep in s.
func Index(s, sep string) int { func Index(s, sep string) int {
if sep == "" { if sep == "" {
return 0 return 0
@ -49,7 +51,8 @@ func Index(s, sep string) int {
return -1 return -1
} }
// Split string into list of strings at separators // 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 { func Split(s, sep string) []string {
if sep == "" { if sep == "" {
return Explode(s) return Explode(s)
@ -71,7 +74,8 @@ func Split(s, sep string) []string {
return a return a
} }
// Join list of strings with separators between them. // 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 { func Join(a []string, sep string) string {
if len(a) == 0 { if len(a) == 0 {
return "" return ""