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Bug 773296 - Part 24: Recognize variables in CSS.supports("var-blah", "whatever") calls. r=dbaron

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This commit is contained in:
Cameron McCormack 2013-12-12 13:09:46 +11:00
parent 44dcde583f
commit 57f7c4a4c8
1 changed files with 42 additions and 20 deletions
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62
layout/style/nsCSSParser.cpp
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@ -1561,14 +1561,27 @@ CSSParserImpl::EvaluateSupportsDeclaration(const nsAString& aProperty,
InitScanner(scanner, reporter, aDocURL, aBaseURL, aDocPrincipal);
nsAutoSuppressErrors suppressErrors(this);
bool parsedOK = ParseProperty(propID) && !GetToken(true);
bool parsedOK;
if (propID == eCSSPropertyExtra_variable) {
MOZ_ASSERT(Substring(aProperty,
0, VAR_PREFIX_LENGTH).EqualsLiteral("var-"));
const nsDependentSubstring varName =
Substring(aProperty, VAR_PREFIX_LENGTH); // remove 'var-'
CSSVariableDeclarations::Type variableType;
nsString variableValue;
parsedOK = ParseVariableDeclaration(&variableType, variableValue) &&
!GetToken(true);
} else {
parsedOK = ParseProperty(propID) && !GetToken(true);
mTempData.ClearProperty(propID);
mTempData.AssertInitialState();
}
CLEAR_ERROR();
ReleaseScanner();
mTempData.ClearProperty(propID);
mTempData.AssertInitialState();
return parsedOK;
}
@ -12341,25 +12354,32 @@ CSSParserImpl::ParseVariableDeclaration(CSSVariableDeclarations::Type* aType,
nsString impliedCharacters;
// Record the token stream while parsing a variable value.
mScanner->StartRecording();
if (!mInSupportsCondition) {
mScanner->StartRecording();
}
if (!ParseValueWithVariables(&type, &dropBackslash, impliedCharacters,
nullptr, nullptr)) {
mScanner->StopRecording();
if (!mInSupportsCondition) {
mScanner->StopRecording();
}
return false;
}
if (type == CSSVariableDeclarations::eTokenStream) {
// This was indeed a token stream value, so store it in variableValue.
mScanner->StopRecording(variableValue);
if (dropBackslash) {
MOZ_ASSERT(!variableValue.IsEmpty() &&
variableValue[variableValue.Length() - 1] == '\\');
variableValue.Truncate(variableValue.Length() - 1);
if (!mInSupportsCondition) {
if (type == CSSVariableDeclarations::eTokenStream) {
// This was indeed a token stream value, so store it in variableValue.
mScanner->StopRecording(variableValue);
if (dropBackslash) {
MOZ_ASSERT(!variableValue.IsEmpty() &&
variableValue[variableValue.Length() - 1] == '\\');
variableValue.Truncate(variableValue.Length() - 1);
}
variableValue.Append(impliedCharacters);
} else {
// This was either 'inherit' or 'initial'; we don't need the recorded
// input.
mScanner->StopRecording();
}
variableValue.Append(impliedCharacters);
} else {
// This was either 'inherit' or 'initial'; we don't need the recorded input.
mScanner->StopRecording();
}
if (mHavePushBack && type == CSSVariableDeclarations::eTokenStream) {
@ -12371,9 +12391,11 @@ CSSParserImpl::ParseVariableDeclaration(CSSVariableDeclarations::Type* aType,
mToken.IsSymbol(';') ||
mToken.IsSymbol(']') ||
mToken.IsSymbol('}'));
MOZ_ASSERT(!variableValue.IsEmpty());
MOZ_ASSERT(variableValue[variableValue.Length() - 1] == mToken.mSymbol);
variableValue.Truncate(variableValue.Length() - 1);
if (!mInSupportsCondition) {
MOZ_ASSERT(!variableValue.IsEmpty());
MOZ_ASSERT(variableValue[variableValue.Length() - 1] == mToken.mSymbol);
variableValue.Truncate(variableValue.Length() - 1);
}
}
*aType = type;