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Added strings.FieldsFunc, a generalization of strings.Fields in style of the strings.Trim*Func functions.

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R=golang-dev, r
CC=golang-dev
https://golang.org/cl/824051
This commit is contained in:
Kyle Consalus 2010-04-19 16:36:50 -07:00 • committed by Rob Pike
parent 47c4416b7e
commit ad2c5a4984
2 changed files with 25 additions and 2 deletions
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11
src/pkg/strings/strings.go
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@ -172,12 +172,19 @@ func SplitAfter(s, sep string, n int) []string {
// Fields splits the string s around each instance of one or more consecutive white space
// characters, returning an array of substrings of s or an empty list if s contains only white space.
func Fields(s string) []string {
return FieldsFunc(s, unicode.IsSpace)
}
// FieldsFunc splits the string s at each run of Unicode code points c satifying f(c)
// and returns an array of slices of s. If no code points in s satisfy f(c), an empty slice
// is returned.
func FieldsFunc(s string, f func(int) bool) []string {
// First count the fields.
n := 0
inField := false
for _, rune := range s {
wasInField := inField
inField = !unicode.IsSpace(rune)
inField = !f(rune)
if inField && !wasInField {
n++
}
@ -188,7 +195,7 @@ func Fields(s string) []string {
na := 0
fieldStart := -1 // Set to -1 when looking for start of field.
for i, rune := range s {
if unicode.IsSpace(rune) {
if f(rune) {
if fieldStart >= 0 {
a[na] = s[fieldStart:i]
na++