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unicode: add "In" function to test membership of a rune

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The existing function, IsOneOf, is hard to use. Since the slice comes
before the rune, in parallelism with the other Is functions, the slice
is clumsy to build. This CL adds a nicer-signatured In function of
equivalent functionality (its implementation is identical) that's much
easier to use. Compare:
        unicode.IsOneOf([]*unicode.RangeTable{unicode.Letter, unicode.Number}, r)
        unicode.In(r, unicode.Letter, unicode.Number)

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/11672044
This commit is contained in:
Rob Pike 2013-07-24 10:27:58 +10:00
parent a0a45bbb71
commit 6a801539c5
2 changed files with 17 additions and 6 deletions
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19
src/pkg/unicode/graphic.go
View File

@ -39,7 +39,7 @@ func IsGraphic(r rune) bool {
if uint32(r) <= MaxLatin1 { if uint32(r) <= MaxLatin1 {
return properties[uint8(r)]&pg != 0 return properties[uint8(r)]&pg != 0
} }
return IsOneOf(GraphicRanges, r) return In(r, GraphicRanges...)
} }
// IsPrint reports whether the rune is defined as printable by Go. Such // IsPrint reports whether the rune is defined as printable by Go. Such
@ -51,12 +51,23 @@ func IsPrint(r rune) bool {
if uint32(r) <= MaxLatin1 { if uint32(r) <= MaxLatin1 {
return properties[uint8(r)]&pp != 0 return properties[uint8(r)]&pp != 0
} }
return IsOneOf(PrintRanges, r) return In(r, PrintRanges...)
} }
// IsOneOf reports whether the rune is a member of one of the ranges. // IsOneOf reports whether the rune is a member of one of the ranges.
func IsOneOf(set []*RangeTable, r rune) bool { // The function "In" provides a nicer signature and should be used in preference to IsOneOf.
for _, inside := range set { func IsOneOf(ranges []*RangeTable, r rune) bool {
for _, inside := range ranges {
if Is(inside, r) {
return true
}
}
return false
}
// In reports whether the rune is a member of one of the ranges.
func In(r rune, ranges ...*RangeTable) bool {
for _, inside := range ranges {
if Is(inside, r) { if Is(inside, r) {
return true return true
} }

4
src/pkg/unicode/graphic_test.go
View File

@ -71,7 +71,7 @@ func TestNumberLatin1(t *testing.T) {
func TestIsPrintLatin1(t *testing.T) { func TestIsPrintLatin1(t *testing.T) {
for i := rune(0); i <= MaxLatin1; i++ { for i := rune(0); i <= MaxLatin1; i++ {
got := IsPrint(i) got := IsPrint(i)
want := IsOneOf(PrintRanges, i) want := In(i, PrintRanges...)
if i == ' ' { if i == ' ' {
want = true want = true
} }
@ -84,7 +84,7 @@ func TestIsPrintLatin1(t *testing.T) {
func TestIsGraphicLatin1(t *testing.T) { func TestIsGraphicLatin1(t *testing.T) {
for i := rune(0); i <= MaxLatin1; i++ { for i := rune(0); i <= MaxLatin1; i++ {
got := IsGraphic(i) got := IsGraphic(i)
want := IsOneOf(GraphicRanges, i) want := In(i, GraphicRanges...)
if got != want { if got != want {
t.Errorf("%U incorrect: got %t; want %t", i, got, want) t.Errorf("%U incorrect: got %t; want %t", i, got, want)
} }