Age | Commit message (Collapse) | Author |
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This helper can be used to used to retrieve the code unit offset of an
active Utf16CodePointIterator efficiently.
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It's very common to encounter single-character strings in JavaScript on
the web. We can make such strings significantly lighter by having a
1-character inline capacity on the Vectors.
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Most of String.prototype and RegExp.prototype is implemented with UTF-16
so this is to prevent extra copying of the string data.
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The current method of iterating through the string to access a code
point hurts performance quite badly for very large strings. The test262
test "RegExp/property-escapes/generated/Any.js" previously took 3 hours
to complete; this one change brings it down to under 10 seconds.
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This will work for ASCII code points. Unicode case folding will be
needed for non-ASCII.
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To be used as a RegexStringView variant, Utf16View must provide a couple
more helper methods. It must also not default its assignment operators,
because that implicitly deletes move/copy constructors.
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Also includes a way to transcode from and to UTF-8 strings.
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