Simplify valueToUSVString

[Darin Adler]

Simplify valueToUSVString

[Darin Adler]

Created attachment 285479 [details]
Patch

[Darin Adler]

Note that the String::find function calls its function on each code unit, not each code point, so it can't be used to find unpaired surrogates. Instead it was finding all surrogates.

[Darin Adler]

Comment on attachment 285479 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=285479&action=review

> Source/WebCore/bindings/js/JSDOMBinding.cpp:141
> +    bool foundUnpairedSurrogate = false;
> +    for (auto codePoint : view.codePoints()) {
> +        if (U_IS_SURROGATE(codePoint)) {
> +            foundUnpairedSurrogate = true;
> +            break;
> +        }
> +    }
> +    if (!foundUnpairedSurrogate)
> +        return string;

Or I could write a StringView::contains that takes a function that takes a UChar32 and have it iterate code points to remove this loop from this function. To do that I would presumably rename CharacterMatchFunction to CodeUnitMatchFunction and then add a CodePointMatchFunction type. But function pointers are inefficient. I wonder if there is a simple way to write a version that will inline the lambda that is passed in.

(Strangely I noticed we have both CharacterMatchFunction in StringView.h and CharacterMatchFunctionPtr in StringImpl.h. We also have a function named stripWhiteSpace that strips arbitrary code units and simplifyWhiteSpace that "simplifies" arbitrary code units. Needs some cleanup I think.)

[WebKit Commit Bot]

Comment on attachment 285479 [details]
Patch

Clearing flags on attachment: 285479

Committed r204228: <http://trac.webkit.org/changeset/204228>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.