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#include <mbgl/style/expression/at.hpp>
#include <mbgl/util/string.hpp>
namespace mbgl {
namespace style {
namespace expression {
EvaluationResult At::evaluate(const EvaluationContext& params) const {
const EvaluationResult evaluatedIndex = index->evaluate(params);
const EvaluationResult evaluatedInput = input->evaluate(params);
if (!evaluatedIndex) {
return evaluatedIndex.error();
}
if (!evaluatedInput) {
return evaluatedInput.error();
}
const auto i = evaluatedIndex->get<double>();
const auto inputArray = evaluatedInput->get<std::vector<Value>>();
if (i < 0 || i >= inputArray.size()) {
return EvaluationError {
"Array index out of bounds: " + stringify(i) +
" > " + util::toString(inputArray.size()) + "."
};
}
if (i != std::floor(i)) {
return EvaluationError {
"Array index must be an integer, but found " + stringify(i) + " instead."
};
}
return inputArray[static_cast<std::size_t>(i)];
}
void At::eachChild(const std::function<void(const Expression&)>& visit) const {
visit(*index);
visit(*input);
}
using namespace mbgl::style::conversion;
ParseResult At::parse(const Convertible& value, ParsingContext& ctx) {
assert(isArray(value));
std::size_t length = arrayLength(value);
if (length != 3) {
ctx.error("Expected 2 arguments, but found " + util::toString(length - 1) + " instead.");
return ParseResult();
}
ParseResult index = ctx.parse(arrayMember(value, 1), 1, {type::Number});
type::Type inputType = type::Array(ctx.getExpected() ? *ctx.getExpected() : type::Value);
ParseResult input = ctx.parse(arrayMember(value, 2), 2, {inputType});
if (!index || !input) return ParseResult();
return ParseResult(std::make_unique<At>(std::move(*index), std::move(*input)));
}
} // namespace expression
} // namespace style
} // namespace mbgl
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