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Issue #2084 - Part 2: Simplify logic in CSSParserImpl::LookupKeywordPrefixAware

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Based on https://bugzilla.mozilla.org/show_bug.cgi?id=1259348
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FranklinDM 2023-01-06 21:14:29 +08:00 • committed by roytam1
commit 56e636d8ec
1 changed files with 23 additions and 52 deletions
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73
layout/style/nsCSSParser.cpp
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@ -7112,65 +7112,36 @@ CSSParserImpl::LookupKeywordPrefixAware(nsAString& aKeywordStr,
{
nsCSSKeyword keyword = nsCSSKeywords::LookupKeyword(aKeywordStr);
if (!sWebkitPrefixedAliasesEnabled) {
// Not accepting webkit-prefixed keywords -> don't do anything special.
return keyword;
}
if (aKeywordTable == nsCSSProps::kDisplayKTable) {
// NOTE: This code will be considerably simpler once we can do away with
// all Unprefixing Service code, in bug 1259348. But for the time being, we
// have to support two different strategies for handling -webkit-box here:
// (1) "Native support" (sWebkitPrefixedAliasesEnabled): we assume that
// -webkit-box will parse correctly (via an entry in kDisplayKTable),
// and we simply make a note that we've parsed it (so that we can we
// can give later "-moz-box" styling special handling as noted below).
// (2) "Unprefixing Service support" (ShouldUseUnprefixingService): we
// convert "-webkit-box" directly to modern "flex" (& do the same for
// any later "-moz-box" styling).
//
// Note that sWebkitPrefixedAliasesEnabled and
// ShouldUseUnprefixingService() are mutually exlusive, because the latter
// explicitly defers to the former.
if ((keyword == eCSSKeyword__webkit_box ||
keyword == eCSSKeyword__webkit_inline_box)) {
const bool usingUnprefixingService = false;
// XXXdholbert This bool^ will be removed & this whole function will be
// simplified in the next patch in this series.
if (sWebkitPrefixedAliasesEnabled || usingUnprefixingService) {
// Make a note that we're accepting some "-webkit-{inline-}box" styling,
// so we can give special treatment to subsequent "-moz-{inline}-box".
// (See special treatment below.)
if (mWebkitBoxUnprefixState == eHaveNotUnprefixed) {
mWebkitBoxUnprefixState = eHaveUnprefixed;
}
if (usingUnprefixingService) {
// When we're using the unprefixing service, we treat
// "display:-webkit-box" as if it were "display:flex"
// (and "-webkit-inline-box" as "inline-flex").
return (keyword == eCSSKeyword__webkit_box) ?
eCSSKeyword_flex : eCSSKeyword_inline_flex;
}
// Make a note that we're accepting some "-webkit-{inline-}box" styling,
// so we can give special treatment to subsequent "-moz-{inline}-box".
// (See special treatment below.)
if (mWebkitBoxUnprefixState == eHaveNotUnprefixed) {
mWebkitBoxUnprefixState = eHaveUnprefixed;
}
}
// If we've seen "display: -webkit-box" (or "-webkit-inline-box") in an
// earlier declaration and we honored it, then we have to watch out for
// later "display: -moz-box" (and "-moz-inline-box") declarations; they're
// likely just a halfhearted attempt at compatibility, and they actually
// end up stomping on our emulation of the earlier -webkit-box
// display-value, via the CSS cascade. To prevent this problem, we treat
// "display: -moz-box" & "-moz-inline-box" as if they were simply a
// repetition of the webkit equivalent that we already parsed.
if (mWebkitBoxUnprefixState == eHaveUnprefixed &&
(keyword == eCSSKeyword__moz_box ||
keyword == eCSSKeyword__moz_inline_box)) {
} else if (mWebkitBoxUnprefixState == eHaveUnprefixed &&
(keyword == eCSSKeyword__moz_box ||
keyword == eCSSKeyword__moz_inline_box)) {
// If we've seen "display: -webkit-box" (or "-webkit-inline-box") in an
// earlier declaration and we honored it, then we have to watch out for
// later "display: -moz-box" (and "-moz-inline-box") declarations; they're
// likely just a halfhearted attempt at compatibility, and they actually
// end up stomping on our emulation of the earlier -webkit-box
// display-value, via the CSS cascade. To prevent this problem, we treat
// "display: -moz-box" & "-moz-inline-box" as if they were simply a
// repetition of the webkit equivalent that we already parsed.
MOZ_ASSERT(sWebkitPrefixedAliasesEnabled,
"The only way mWebkitBoxUnprefixState can be eHaveUnprefixed "
"is if we're supporting webkit-prefixed aliases");
if (sWebkitPrefixedAliasesEnabled) {
return (keyword == eCSSKeyword__moz_box) ?
eCSSKeyword__webkit_box : eCSSKeyword__webkit_inline_box;
}
// (If we get here, we're using the Unprefixing Service, which means
// we're unprefixing all the way to modern flexbox display values.)
return (keyword == eCSSKeyword__moz_box) ?
eCSSKeyword_flex : eCSSKeyword_inline_flex;
eCSSKeyword__webkit_box : eCSSKeyword__webkit_inline_box;
}
}