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#pragma once
#include <vector>
#include <memory>
#include <mbgl/util/optional.hpp>
#include <mbgl/util/variant.hpp>
#include <mbgl/util/color.hpp>
#include <mbgl/style/expression/expression.hpp>
#include <mbgl/style/expression/type.hpp>
#include <mbgl/style/expression/value.hpp>
#include <mbgl/style/expression/parsing_context.hpp>
#include <mbgl/style/conversion.hpp>
namespace mbgl {
namespace style {
namespace expression {
class Literal : public Expression {
public:
Literal(Value value_) : Expression(typeOf(value_)), value(value_) {}
Literal(type::Array type, std::vector<Value> value_) : Expression(type), value(value_) {}
EvaluationResult evaluate(const EvaluationParameters&) const override {
return value;
}
bool isFeatureConstant() const override { return true; }
bool isZoomConstant() const override { return true; }
template <class V>
static ParseResult parse(const V& value, ParsingContext ctx) {
const Value& parsedValue = parseValue(value);
// special case: infer the item type if possible for zero-length arrays
if (
ctx.expected &&
ctx.expected->template is<type::Array>() &&
parsedValue.template is<std::vector<Value>>()
) {
auto type = typeOf(parsedValue).template get<type::Array>();
auto expected = ctx.expected->template get<type::Array>();
if (
type.N && (*type.N == 0) &&
(!expected.N || (*expected.N == 0))
) {
return ParseResult(std::make_unique<Literal>(expected, parsedValue.template get<std::vector<Value>>()));
}
}
return ParseResult(std::make_unique<Literal>(parsedValue));
}
private:
Value value;
};
} // namespace expression
} // namespace style
} // namespace mbgl
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