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#include <mbgl/style/function/convert.hpp>
namespace mbgl {
namespace style {
namespace expression {
std::unique_ptr<Expression> Convert::fromIdentityFunction(const std::string& property, type::Type type) {
return type.match(
[&] (const type::StringType&) {
return makeGet(type::String, property);
},
[&] (const type::NumberType&) {
return makeGet(type::Number, property);
},
[&] (const type::BooleanType&) {
return makeGet(type::Boolean, property);
},
[&] (const type::ColorType&) {
std::vector<std::unique_ptr<Expression>> args;
args.push_back(makeGet(type::String, property));
return std::make_unique<Coercion>(type::Color, std::move(args));
},
[&] (const type::Array& arr) {
std::vector<std::unique_ptr<Expression>> getArgs;
getArgs.push_back(makeLiteral(property));
ParsingContext ctx;
ParseResult get = createCompoundExpression("get", std::move(getArgs), ctx);
assert(get);
assert(ctx.getErrors().size() == 0);
return std::make_unique<ArrayAssertion>(arr, std::move(*get));
},
[&] (const auto&) -> std::unique_ptr<Expression> {
return makeLiteral(Null);
}
);
}
} // namespace expression
} // namespace style
} // namespace mbgl
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