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#include <mbgl/style/expression/array_assertion.hpp>
#include <mbgl/style/expression/check_subtype.hpp>
#include <mbgl/util/string.hpp>
namespace mbgl {
namespace style {
namespace expression {
EvaluationResult ArrayAssertion::evaluate(const EvaluationContext& params) const {
auto result = input->evaluate(params);
if (!result) {
return result.error();
}
type::Type expected = getType();
type::Type actual = typeOf(*result);
if (checkSubtype(expected, actual)) {
return EvaluationError {
"Expected value to be of type " + toString(expected) +
", but found " + toString(actual) + " instead."
};
}
return *result;
}
void ArrayAssertion::eachChild(const std::function<void(const Expression&)>& visit) const {
visit(*input);
}
using namespace mbgl::style::conversion;
ParseResult ArrayAssertion::parse(const Convertible& value, ParsingContext& ctx) {
static std::unordered_map<std::string, type::Type> itemTypes {
{"string", type::String},
{"number", type::Number},
{"boolean", type::Boolean}
};
auto length = arrayLength(value);
if (length < 2 || length > 4) {
ctx.error("Expected 1, 2, or 3 arguments, but found " + util::toString(length - 1) + " instead.");
return ParseResult();
}
optional<type::Type> itemType;
optional<std::size_t> N;
if (length > 2) {
optional<std::string> itemTypeName = toString(arrayMember(value, 1));
auto it = itemTypeName ? itemTypes.find(*itemTypeName) : itemTypes.end();
if (it == itemTypes.end()) {
ctx.error(
R"(The item type argument of "array" must be one of string, number, boolean)",
1
);
return ParseResult();
}
itemType = it->second;
} else {
itemType = {type::Value};
}
if (length > 3) {
auto n = toNumber(arrayMember(value, 2));
if (!n || *n != std::floor(*n)) {
ctx.error(
R"(The length argument to "array" must be a positive integer literal.)",
2
);
return ParseResult();
}
N = optional<std::size_t>(*n);
}
auto input = ctx.parse(arrayMember(value, length - 1), length - 1, {type::Value});
if (!input) {
return input;
}
return ParseResult(std::make_unique<ArrayAssertion>(
type::Array(*itemType, N),
std::move(*input)
));
}
} // namespace expression
} // namespace style
} // namespace mbgl
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