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LibWeb: Implement CSS round()

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stelar7 2023-05-27 16:07:50 +02:00 • committed by Sam Atkins
parent ec0054da06
commit b2230c826b
4 changed files with 210 additions and 0 deletions
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71
Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
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@ -3963,6 +3963,74 @@ ErrorOr<OwnPtr<CalculationNode>> Parser::parse_exp_function(Function const& func
return TRY(ExpCalculationNode::create(node_a.release_nonnull()));
}
ErrorOr<OwnPtr<CalculationNode>> Parser::parse_round_function(Function const& function)
{
TokenStream stream { function.values() };
auto parameters = parse_a_comma_separated_list_of_component_values(stream);
if (parameters.size() != 2 && parameters.size() != 3) {
dbgln_if(CSS_PARSER_DEBUG, "round() must have exactly two or three parameters"sv);
return nullptr;
}
OwnPtr<CalculationNode> node_a = nullptr;
OwnPtr<CalculationNode> node_b = nullptr;
auto mode = CalculationNode::RoundingMode::Nearest;
if (parameters.size() == 3) {
auto rounding_mode_component = parameters[0][0];
if (!rounding_mode_component.is(Token::Type::Ident)) {
dbgln_if(CSS_PARSER_DEBUG, "round() mode must be a string"sv);
return nullptr;
}
auto mode_string = rounding_mode_component.token().ident();
if (mode_string.equals_ignoring_ascii_case("nearest"sv)) {
mode = CalculationNode::RoundingMode::Nearest;
} else if (mode_string.equals_ignoring_ascii_case("up"sv)) {
mode = CalculationNode::RoundingMode::Up;
} else if (mode_string.equals_ignoring_ascii_case("down"sv)) {
mode = CalculationNode::RoundingMode::Down;
} else if (mode_string.equals_ignoring_ascii_case("to-zero"sv)) {
mode = CalculationNode::RoundingMode::TowardZero;
} else {
dbgln_if(CSS_PARSER_DEBUG, "round() mode must be one of 'nearest', 'up', 'down', or 'to-zero'"sv);
return nullptr;
}
node_a = TRY(parse_a_calculation(parameters[1]));
node_b = TRY(parse_a_calculation(parameters[2]));
} else {
node_a = TRY(parse_a_calculation(parameters[0]));
node_b = TRY(parse_a_calculation(parameters[1]));
}
if (!node_a || !node_b) {
dbgln_if(CSS_PARSER_DEBUG, "round() parameters must be valid calculations"sv);
return nullptr;
}
auto node_a_maybe_parameter_type = node_a->resolved_type();
if (!node_a_maybe_parameter_type.has_value()) {
dbgln_if(CSS_PARSER_DEBUG, "Failed to resolve type for round() parameter 1"sv);
return nullptr;
}
auto node_b_maybe_parameter_type = node_b->resolved_type();
if (!node_b_maybe_parameter_type.has_value()) {
dbgln_if(CSS_PARSER_DEBUG, "Failed to resolve type for round() parameter 2"sv);
return nullptr;
}
auto node_a_resolved_type = node_a_maybe_parameter_type.value();
auto node_b_resolved_type = node_b_maybe_parameter_type.value();
if (node_a_resolved_type != node_b_resolved_type) {
dbgln_if(CSS_PARSER_DEBUG, "round() parameters must all be of the same type"sv);
return nullptr;
}
return TRY(RoundCalculationNode::create(mode, node_a.release_nonnull(), node_b.release_nonnull()));
}
ErrorOr<RefPtr<StyleValue>> Parser::parse_dynamic_value(ComponentValue const& component_value)
{
if (component_value.is_function()) {
@ -4043,6 +4111,9 @@ ErrorOr<OwnPtr<CalculationNode>> Parser::parse_a_calc_function_node(Function con
if (function.name().equals_ignoring_ascii_case("exp"sv))
return TRY(parse_exp_function(function));
if (function.name().equals_ignoring_ascii_case("round"sv))
return TRY(parse_round_function(function));
dbgln_if(CSS_PARSER_DEBUG, "We didn't implement `{}` function yet", function.name());
return nullptr;
}