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unicode: change SimpleFold to handle invalid runes
Functions like ToLower and ToUpper return the invalid rune back, so we might as well do the same here. I changed my mind about panicking when I tried to document the behavior. Fixes #16690 (again). Change-Id: If1c68bfcd66daea160fd19948e7672b0e1add106 Reviewed-on: https://go-review.googlesource.com/30935 Run-TryBot: Russ Cox <rsc@golang.org> Reviewed-by: Rob Pike <r@golang.org>
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@ -320,6 +320,7 @@ type foldPair struct {
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// the Unicode-defined simple case folding. Among the code points
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// equivalent to rune (including rune itself), SimpleFold returns the
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// smallest rune > r if one exists, or else the smallest rune >= 0.
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// If r is not a valid Unicode code point, SimpleFold(r) returns r.
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//
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// For example:
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// SimpleFold('A') = 'a'
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@ -331,9 +332,11 @@ type foldPair struct {
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//
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// SimpleFold('1') = '1'
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//
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// SimpleFold(-2) = -2
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//
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func SimpleFold(r rune) rune {
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if r < 0 {
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panic("unicode: negative rune is disallowed")
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if r < 0 || r > MaxRune {
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return r
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}
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if int(r) < len(asciiFold) {
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@ -432,19 +432,9 @@ func TestSimpleFold(t *testing.T) {
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r = out
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}
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}
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}
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func TestSimpleFoldPanic(t *testing.T) {
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got := func() (r interface{}) {
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defer func() { r = recover() }()
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SimpleFold(-1)
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return nil
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}()
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want := "unicode: negative rune is disallowed"
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s, _ := got.(string)
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if s != want {
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t.Errorf("SimpleFold(-1) should panic, got: %q, want: %q", got, want)
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if r := SimpleFold(-42); r != -42 {
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t.Errorf("SimpleFold(-42) = %v, want -42", r)
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}
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}
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