213929 2020-07-03 10:37:59 -0700 Convert DateComponents to use StringParsingBuffer 2020-07-30 19:06:19 -0700 1 1 1 Unclassified WebKit New Bugs WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 sam sam andersca darin webkit-bug-importer oldest_to_newest 1668593 0 sam 2020-07-03 10:37:59 -0700 Convert DateComponents to use StringParsingBuffer 1668594 1 403465 sam 2020-07-03 10:41:38 -0700 Created attachment 403465 Patch 1676423 2 405583 sam 2020-07-30 09:58:24 -0700 Created attachment 405583 Patch 1676456 3 405591 sam 2020-07-30 11:03:59 -0700 Created attachment 405591 Patch 1676493 4 405591 darin 2020-07-30 12:37:49 -0700 Comment on attachment 405591 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=405591&action=review > Source/WebCore/platform/DateComponents.cpp:44 > +// HTML5 uses ISO-8601 format with year >= 1. Gregorian calendar started in Continuing to call the HTML specification "HTML5" is quaint. > Source/WebCore/platform/DateComponents.cpp:112 > + skipWhile<CharacterType, isASCIIDigit>(buffer); Is there no way to make this idiom figure out the character type from the buffer argument? > Source/WebCore/platform/DateComponents.cpp:120 > + if (maximumNumberOfDigitsToParse > buffer.lengthRemaining() || !maximumNumberOfDigitsToParse) > + return WTF::nullopt; Subtly awkward naming that caller must *not* pass in a large value for maximumNumberOfDigitsToParse. Doesn't really feel like it’s a maximum from the caller’s point of view. The function could clamp instead of just returning. > Source/WebCore/platform/DateComponents.cpp:142 > + if (value && (*value < minimumValue || *value > maximumValue)) I would have written: if (!(value && *value >= minimumValue && *value <= maximumValue)) Handles null in a different way, but I slightly prefer it. I think one reason is that this idiom does the right thing with non-finite floating point values. Also if refactoring to use a function, it’s more logical to have an "is good" function than an "is bad" function. In fact, I kind of wish the WTF::String::isNull function had the opposite sense and had some awesome name for the same reason. > Source/WebCore/platform/DateComponents.cpp:465 > + StringParsingBuffer<CharacterType> temporaryBuffer = buffer; Maybe just use auto here? > Source/WebCore/platform/DateComponents.cpp:485 > + // Regardless of the number of digits, we only ever parse at most 3. All other > + // digits after that are ignored, but the buffer is incremented as if they were > + // all parsed. I don’t see the code that increments the buffer as if they were all parsed. > Source/WebCore/platform/DateComponents.cpp:659 > + if (doubleYear < minimumYear || maximumYear < doubleYear) Same thought about writing this in the !"is good" way instead of the "is bad" way. And here it’s literally floating point, so reversing it would let us optimize by removing the std::isfinite check above. > Source/WebCore/platform/DateComponents.cpp:697 > + if (m_year <= minimumYear) Fascinating that this is "<=". I’m sure we have test coverage. 1676550 5 sam 2020-07-30 14:25:55 -0700 (In reply to Darin Adler from comment #4) > Comment on attachment 405591 [details] > Patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=405591&action=review > > > Source/WebCore/platform/DateComponents.cpp:44 > > +// HTML5 uses ISO-8601 format with year >= 1. Gregorian calendar started in > > Continuing to call the HTML specification "HTML5" is quaint. Yeah. Fixed. > > > Source/WebCore/platform/DateComponents.cpp:112 > > + skipWhile<CharacterType, isASCIIDigit>(buffer); > > Is there no way to make this idiom figure out the character type from the > buffer argument? I'll see, but so far, unless we convert to using function objects rather than function pointers, we can't deduce CharacterType. > > > Source/WebCore/platform/DateComponents.cpp:120 > > + if (maximumNumberOfDigitsToParse > buffer.lengthRemaining() || !maximumNumberOfDigitsToParse) > > + return WTF::nullopt; > > Subtly awkward naming that caller must *not* pass in a large value for > maximumNumberOfDigitsToParse. Doesn't really feel like it’s a maximum from > the caller’s point of view. The function could clamp instead of just > returning. I think this whole maximum number concept can be removed eventually. > > > Source/WebCore/platform/DateComponents.cpp:142 > > + if (value && (*value < minimumValue || *value > maximumValue)) > > I would have written: > > if (!(value && *value >= minimumValue && *value <= maximumValue)) > > Handles null in a different way, but I slightly prefer it. I think one > reason is that this idiom does the right thing with non-finite floating > point values. Also if refactoring to use a function, it’s more logical to > have an "is good" function than an "is bad" function. In fact, I kind of > wish the WTF::String::isNull function had the opposite sense and had some > awesome name for the same reason. Ok. Changed. > > > Source/WebCore/platform/DateComponents.cpp:465 > > + StringParsingBuffer<CharacterType> temporaryBuffer = buffer; > > Maybe just use auto here? Fixed. > > > Source/WebCore/platform/DateComponents.cpp:485 > > + // Regardless of the number of digits, we only ever parse at most 3. All other > > + // digits after that are ignored, but the buffer is incremented as if they were > > + // all parsed. > > I don’t see the code that increments the buffer as if they were all parsed. It's right below. // Only after successfully parsing and validating 'millisecond', do we increment the real buffer. buffer += 1 + digitsLength; > > > Source/WebCore/platform/DateComponents.cpp:659 > > + if (doubleYear < minimumYear || maximumYear < doubleYear) > > Same thought about writing this in the !"is good" way instead of the "is > bad" way. And here it’s literally floating point, so reversing it would let > us optimize by removing the std::isfinite check above. Nice. 1676552 6 sam 2020-07-30 14:29:07 -0700 (In reply to Sam Weinig from comment #5) > (In reply to Darin Adler from comment #4) > > Comment on attachment 405591 [details] > > Patch > > > > View in context: > > https://bugs.webkit.org/attachment.cgi?id=405591&action=review > > > > > > Source/WebCore/platform/DateComponents.cpp:112 > > > + skipWhile<CharacterType, isASCIIDigit>(buffer); > > > > Is there no way to make this idiom figure out the character type from the > > buffer argument? > > I'll see, but so far, unless we convert to using function objects rather > than function pointers, we can't deduce CharacterType. > I guess an alternative option would be to just stop trying to deduce CharacterType and have two overloads of skipWhile, one for LChar, one for UChar: template<bool characterPredicate(LChar)> void skipWhile(const LChar*& position, const LChar* end) { while (position < end && characterPredicate(*position)) ++position; } template<bool characterPredicate(UChar)> void skipWhile(const UChar*& position, const UChar* end) { while (position < end && characterPredicate(*position)) ++position; } 1676554 7 sam 2020-07-30 14:29:41 -0700 (In reply to Sam Weinig from comment #6) > (In reply to Sam Weinig from comment #5) > > (In reply to Darin Adler from comment #4) > > > Comment on attachment 405591 [details] > > > Patch > > > > > > View in context: > > > https://bugs.webkit.org/attachment.cgi?id=405591&action=review > > > > > > > > > Source/WebCore/platform/DateComponents.cpp:112 > > > > + skipWhile<CharacterType, isASCIIDigit>(buffer); > > > > > > Is there no way to make this idiom figure out the character type from the > > > buffer argument? > > > > I'll see, but so far, unless we convert to using function objects rather > > than function pointers, we can't deduce CharacterType. > > > > I guess an alternative option would be to just stop trying to deduce > CharacterType and have two overloads of skipWhile, one for LChar, one for > UChar: > > template<bool characterPredicate(LChar)> void skipWhile(const LChar*& > position, const LChar* end) > { > while (position < end && characterPredicate(*position)) > ++position; > } > > template<bool characterPredicate(UChar)> void skipWhile(const UChar*& > position, const UChar* end) > { > while (position < end && characterPredicate(*position)) > ++position; > } This is untested, might not compile. 1676556 8 405619 sam 2020-07-30 14:31:00 -0700 Created attachment 405619 Patch 1676665 9 405645 sam 2020-07-30 17:50:20 -0700 Created attachment 405645 Patch 1676669 10 405647 sam 2020-07-30 18:05:14 -0700 Created attachment 405647 Patch 1676681 11 ews-feeder 2020-07-30 19:05:41 -0700 Committed r265126: <https://trac.webkit.org/changeset/265126> All reviewed patches have been landed. Closing bug and clearing flags on attachment 405647. 1676682 12 webkit-bug-importer 2020-07-30 19:06:19 -0700 <rdar://problem/66359344> 403465 2020-07-03 10:41:38 -0700 2020-07-30 09:58:22 -0700 Patch bug-213929-20200703104138.patch text/plain 26537 sam SW5kZXg6IFNvdXJjZS9XZWJDb3JlL0NoYW5nZUxvZwo9PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09Ci0tLSBTb3VyY2UvV2Vi Q29yZS9DaGFuZ2VMb2cJKHJldmlzaW9uIDI2MzkwMSkKKysrIFNvdXJjZS9XZWJDb3JlL0NoYW5n ZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDQ1IEBACisyMDIwLTA3LTAzICBTYW0gV2Vp bmlnICA8d2VpbmlnQGFwcGxlLmNvbT4KKworICAgICAgICBDb252ZXJ0IERhdGVDb21wb25lbnRz IHRvIHVzZSBTdHJpbmdQYXJzaW5nQnVmZmVyCisgICAgICAgIGh0dHBzOi8vYnVncy53ZWJraXQu b3JnL3Nob3dfYnVnLmNnaT9pZD0yMTM5MjkKKworICAgICAgICBSZXZpZXdlZCBieSBOT0JPRFkg KE9PUFMhKS4KKworICAgICAgICAtIFN3aXRjaGVzIHN0cmluZyBwYXJzaW5nIGluIERhdGVDb21w b25lbnRzIHRvIHVzaW5nIFN0cmluZ1BhcnNpbmdCdWZmZXIsCisgICAgICAgICAgbWFraW5nIHVz 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