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#include <mbgl/style/expression/assertion.hpp>
#include <mbgl/style/expression/check_subtype.hpp>
namespace mbgl {
namespace style {
namespace expression {
using namespace mbgl::style::conversion;
ParseResult Assertion::parse(const Convertible& value, ParsingContext& ctx) {
static std::unordered_map<std::string, type::Type> types {
{"string", type::String},
{"number", type::Number},
{"boolean", type::Boolean},
{"object", type::Object}
};
std::size_t length = arrayLength(value);
if (length < 2) {
ctx.error("Expected at least one argument.");
return ParseResult();
}
auto it = types.find(*toString(arrayMember(value, 0)));
assert(it != types.end());
std::vector<std::unique_ptr<Expression>> parsed;
parsed.reserve(length - 1);
for (std::size_t i = 1; i < length; i++) {
ParseResult input = ctx.parse(arrayMember(value, i), i, {type::Value});
if (!input) return ParseResult();
parsed.push_back(std::move(*input));
}
return ParseResult(std::make_unique<Assertion>(it->second, std::move(parsed)));
}
EvaluationResult Assertion::evaluate(const EvaluationContext& params) const {
for (std::size_t i = 0; i < inputs.size(); i++) {
EvaluationResult value = inputs[i]->evaluate(params);
if (!value) return value;
if (!type::checkSubtype(getType(), typeOf(*value))) {
return value;
} else if (i == inputs.size() - 1) {
return EvaluationError {
"Expected value to be of type " + toString(getType()) +
", but found " + toString(typeOf(*value)) + " instead."
};
}
}
assert(false);
return EvaluationError { "Unreachable" };
};
void Assertion::eachChild(const std::function<void(const Expression&)>& visit) const {
for(const std::unique_ptr<Expression>& input : inputs) {
visit(*input);
}
};
bool Assertion::operator==(const Expression& e) const {
if (auto rhs = dynamic_cast<const Assertion*>(&e)) {
return getType() == rhs->getType() && Expression::childrenEqual(inputs, rhs->inputs);
}
return false;
}
} // namespace expression
} // namespace style
} // namespace mbgl
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