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#include <mbgl/style/expression/length.hpp>
#include <mbgl/util/string.hpp>
namespace mbgl {
namespace style {
namespace expression {
Length::Length(std::unique_ptr<Expression> input_)
: Expression(type::Number),
input(std::move(input_)) {
}
EvaluationResult Length::evaluate(const EvaluationContext& params) const {
const EvaluationResult value = input->evaluate(params);
if (!value) return value;
return value->match(
[] (const std::string& s) {
return EvaluationResult { double(s.size()) };
},
[] (const std::vector<Value>& v) {
return EvaluationResult { double(v.size()) };
},
[&] (const auto&) -> EvaluationResult {
return EvaluationError { "Expected value to be of type string or array, but found " + toString(typeOf(*value)) + " instead." };
});
}
void Length::eachChild(const std::function<void(const Expression&)>& visit) const {
visit(*input);
}
bool Length::operator==(const Expression& e) const {
if (auto eq = dynamic_cast<const Length*>(&e)) {
return *eq->input == *input;
}
return false;
}
std::vector<optional<Value>> Length::possibleOutputs() const {
return { nullopt };
}
using namespace mbgl::style::conversion;
ParseResult Length::parse(const Convertible& value, ParsingContext& ctx) {
std::size_t length = arrayLength(value);
if (length != 2) {
ctx.error("Expected one argument, but found " + util::toString(length) + " instead.");
return ParseResult();
}
ParseResult input = ctx.parse(arrayMember(value, 1), 1);
if (!input) return ParseResult();
type::Type type = (*input)->getType();
if (!type.is<type::Array>() && !type.is<type::StringType>() && !type.is<type::ValueType>()) {
ctx.error("Expected argument of type string or array, but found " + toString(type) + " instead.");
return ParseResult();
}
return ParseResult(std::make_unique<Length>(std::move(*input)));
}
} // namespace expression
} // namespace style
} // namespace mbgl
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