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LibWeb: Fix whitespace handling in CSS selectors

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Whitespace marks the end of a compound-selector, no matter where
it occurs. `check_for_eof_or_whitespace()` reconsumes the whitespace
token for convenience.
This commit is contained in:
Sam Atkins 2021-07-07 17:47:17 +01:00 • committed by Andreas Kling
parent 57f6d86996
commit 7e4f75c78c
1 changed files with 31 additions and 21 deletions
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52
Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
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@ -218,9 +218,21 @@ Optional<Selector> Parser::parse_single_selector(TokenStream<T>& tokens, bool is
Vector<Selector::ComplexSelector> selectors;
auto check_for_eof_or_whitespace = [&](T& current_value) -> bool {
if (current_value.is(Token::Type::EndOfFile))
return true;
if (current_value.is(Token::Type::Whitespace)) {
tokens.reconsume_current_input_token();
return true;
}
return false;
};
auto parse_simple_selector = [&]() -> Optional<Selector::SimpleSelector> {
auto current_value = tokens.next_token();
if (current_value.is(Token::Type::EndOfFile))
dbgln("parse_simple_selector, start token: {}", current_value.to_string());
if (check_for_eof_or_whitespace(current_value))
return {};
Selector::SimpleSelector::Type type;
@ -245,7 +257,7 @@ Optional<Selector> Parser::parse_single_selector(TokenStream<T>& tokens, bool is
value = ((Token)current_value).m_value.to_string();
} else if (current_value.is(Token::Type::Delim) && ((Token)current_value).delim() == ".") {
current_value = tokens.next_token();
if (current_value.is(Token::Type::EndOfFile))
if (check_for_eof_or_whitespace(current_value))
return {};
if (!current_value.is(Token::Type::Ident)) {
@ -267,7 +279,7 @@ Optional<Selector> Parser::parse_single_selector(TokenStream<T>& tokens, bool is
simple_selector.value = value;
current_value = tokens.next_token();
if (current_value.is(Token::Type::EndOfFile))
if (check_for_eof_or_whitespace(current_value))
return simple_selector;
// FIXME: Attribute selectors want to be their own Selector::SimpleSelector::Type according to the spec.
@ -337,14 +349,6 @@ Optional<Selector> Parser::parse_single_selector(TokenStream<T>& tokens, bool is
}
}
while (attribute_parts.at(attribute_index).is(Token::Type::Whitespace)) {
attribute_index++;
if (attribute_index >= attribute_parts.size()) {
dbgln("Attribute selector ended without a value to match.");
return {};
}
}
if (attribute_index >= attribute_parts.size()) {
dbgln("Attribute selector ended without a value to match.");
return {};
@ -366,13 +370,13 @@ Optional<Selector> Parser::parse_single_selector(TokenStream<T>& tokens, bool is
bool is_pseudo = false;
current_value = tokens.next_token();
if (current_value.is(Token::Type::EndOfFile))
if (check_for_eof_or_whitespace(current_value))
return {};
if (current_value.is(Token::Type::Colon)) {
is_pseudo = true;
current_value = tokens.next_token();
if (current_value.is(Token::Type::EndOfFile))
if (check_for_eof_or_whitespace(current_value))
return {};
}
@ -382,7 +386,7 @@ Optional<Selector> Parser::parse_single_selector(TokenStream<T>& tokens, bool is
return {};
current_value = tokens.next_token();
if (current_value.is(Token::Type::EndOfFile))
if (check_for_eof_or_whitespace(current_value))
return simple_selector;
if (current_value.is(Token::Type::Ident)) {
@ -452,6 +456,8 @@ Optional<Selector> Parser::parse_single_selector(TokenStream<T>& tokens, bool is
auto parse_complex_selector = [&]() -> Optional<Selector::ComplexSelector> {
auto relation = Selector::ComplexSelector::Relation::Descendant;
tokens.skip_whitespace();
auto current_value = tokens.peek_token();
if (current_value.is(Token::Type::Delim)) {
auto delim = ((Token)current_value).delim();
@ -475,12 +481,20 @@ Optional<Selector> Parser::parse_single_selector(TokenStream<T>& tokens, bool is
relation = Selector::ComplexSelector::Relation::Column;
tokens.next_token();
}
} else {
dbgln("Unrecognized relation delimiter: '{}'", delim);
}
}
tokens.skip_whitespace();
Vector<Selector::SimpleSelector> simple_selectors;
for (;;) {
auto current_value = tokens.peek_token();
if (current_value.is(Token::Type::EndOfFile) || current_value.is(Token::Type::Whitespace))
break;
auto component = parse_simple_selector();
if (!component.has_value())
break;
@ -495,17 +509,13 @@ Optional<Selector> Parser::parse_single_selector(TokenStream<T>& tokens, bool is
};
for (;;) {
auto complex = parse_complex_selector();
if (complex.has_value())
selectors.append(complex.value());
auto current_value = tokens.peek_token();
if (current_value.is(Token::Type::EndOfFile))
break;
if (current_value.is(Token::Type::Comma))
break;
tokens.next_token();
auto complex = parse_complex_selector();
if (complex.has_value())
selectors.append(complex.value());
}
if (selectors.is_empty())