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add bytes.IndexByte; common case we can make fast later.

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also pick off the special case in strings.Index.   don't want strings.IndexByte
because the call site will very rarely need to allocate and we can handle the
test in the code itself.   bytes.IndexByte can avoid a common allocation.

R=rsc
CC=golang-dev
https://golang.org/cl/156091
This commit is contained in:
Rob Pike 2009-11-18 19:23:08 -08:00
parent 1a8ebcc4b8
commit 8c1a627e5c
4 changed files with 96 additions and 17 deletions
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9
src/pkg/strings/strings_test.go
View file

@ -46,6 +46,14 @@ var indexTests = []IndexTest{
IndexTest{"foo", "", 0},
IndexTest{"foo", "o", 1},
IndexTest{"abcABCabc", "A", 3},
// cases with one byte strings - test special case in Index()
IndexTest{"", "a", -1},
IndexTest{"x", "a", -1},
IndexTest{"x", "x", 0},
IndexTest{"abc", "a", 0},
IndexTest{"abc", "b", 1},
IndexTest{"abc", "c", 2},
IndexTest{"abc", "x", -1},
}
var lastIndexTests = []IndexTest{
@ -54,6 +62,7 @@ var lastIndexTests = []IndexTest{
IndexTest{"", "foo", -1},
IndexTest{"fo", "foo", -1},
IndexTest{"foo", "foo", 0},
IndexTest{"foo", "f", 0},
IndexTest{"oofofoofooo", "f", 7},
IndexTest{"oofofoofooo", "foo", 7},
IndexTest{"barfoobarfoo", "foo", 9},