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#pragma once
#include <mbgl/style/expression/array_assertion.hpp>
#include <mbgl/style/expression/assertion.hpp>
#include <mbgl/style/expression/case.hpp>
#include <mbgl/style/expression/coalesce.hpp>
#include <mbgl/style/expression/compound_expression.hpp>
#include <mbgl/style/expression/coercion.hpp>
#include <mbgl/style/expression/interpolate.hpp>
#include <mbgl/style/expression/expression.hpp>
#include <mbgl/style/expression/literal.hpp>
#include <mbgl/style/expression/match.hpp>
#include <mbgl/style/expression/step.hpp>
#include <mbgl/style/function/exponential_stops.hpp>
#include <mbgl/style/function/interval_stops.hpp>
#include <mbgl/style/function/categorical_stops.hpp>
#include <mbgl/style/function/composite_exponential_stops.hpp>
#include <mbgl/style/function/composite_interval_stops.hpp>
#include <mbgl/style/function/composite_categorical_stops.hpp>
#include <mbgl/style/function/identity_stops.hpp>
#include <mbgl/util/enum.hpp>
#include <mbgl/style/types.hpp>
#include <string>
namespace mbgl {
namespace style {
namespace expression {
namespace detail {
class ErrorExpression : public Expression {
public:
ErrorExpression(std::string message_) : Expression(type::Error), message(std::move(message_)) {}
void eachChild(const std::function<void(const Expression&)>&) const override {}
bool operator==(const Expression& e) const override {
return dynamic_cast<const ErrorExpression*>(&e);
}
EvaluationResult evaluate(const EvaluationContext&) const override {
return EvaluationError{message};
}
std::vector<optional<Value>> possibleOutputs() const override {
return {};
}
std::string getOperator() const override { return "error"; }
private:
std::string message;
};
} // namespace detail
// Create expressions representing 'classic' (i.e. stop-based) style functions
struct Convert {
template <typename T>
static std::unique_ptr<Literal> makeLiteral(const T& value) {
return std::make_unique<Literal>(Value(toExpressionValue(value)));
}
static std::unique_ptr<Expression> makeGet(type::Type type, const std::string& property) {
ParsingContext ctx;
std::vector<std::unique_ptr<Expression>> getArgs;
getArgs.push_back(makeLiteral(property));
ParseResult get = createCompoundExpression("get", std::move(getArgs), ctx);
assert(get);
assert(ctx.getErrors().size() == 0);
std::vector<std::unique_ptr<Expression>> assertionArgs;
assertionArgs.push_back(std::move(*get));
return std::make_unique<Assertion>(type, std::move(assertionArgs));
}
static std::unique_ptr<Expression> makeZoom() {
ParsingContext ctx;
ParseResult zoom = createCompoundExpression("zoom", std::vector<std::unique_ptr<Expression>>(), ctx);
assert(zoom);
assert(ctx.getErrors().size() == 0);
return std::move(*zoom);
}
static std::unique_ptr<Expression> makeError(std::string message) {
return std::make_unique<detail::ErrorExpression>(message);
}
template <typename Key>
static ParseResult makeMatch(type::Type type,
std::unique_ptr<Expression> input,
std::map<CategoricalValue, std::unique_ptr<Expression>> stops) {
// match expression
typename Match<Key>::Branches branches;
for(auto it = stops.begin(); it != stops.end(); it++) {
assert(it->first.template is<Key>());
Key key = it->first.template get<Key>();
branches.emplace(
std::move(key),
std::move(it->second)
);
}
return ParseResult(std::make_unique<Match<Key>>(std::move(type),
std::move(input),
std::move(branches),
makeError("No matching label")));
}
static ParseResult makeCase(type::Type type,
std::unique_ptr<Expression> input,
std::map<CategoricalValue, std::unique_ptr<Expression>> stops) {
// case expression
std::vector<typename Case::Branch> branches;
auto it = stops.find(true);
std::unique_ptr<Expression> true_case = it == stops.end() ?
makeError("No matching label") :
std::move(it->second);
it = stops.find(false);
std::unique_ptr<Expression> false_case = it == stops.end() ?
makeError("No matching label") :
std::move(it->second);
branches.push_back(std::make_pair(std::move(input), std::move(true_case)));
return ParseResult(std::make_unique<Case>(std::move(type), std::move(branches), std::move(false_case)));
}
template <typename T>
static ParseResult fromCategoricalStops(std::map<CategoricalValue, T> stops, const std::string& property) {
assert(stops.size() > 0);
std::map<CategoricalValue, std::unique_ptr<Expression>> convertedStops;
for(const std::pair<CategoricalValue, T>& stop : stops) {
convertedStops.emplace(
stop.first,
makeLiteral(stop.second)
);
}
type::Type type = valueTypeToExpressionType<T>();
const CategoricalValue& firstKey = stops.begin()->first;
return firstKey.match(
[&](bool) {
return makeCase(type, makeGet(type::Boolean, property), std::move(convertedStops));
},
[&](const std::string&) {
return makeMatch<std::string>(type, makeGet(type::String, property), std::move(convertedStops));
},
[&](int64_t) {
return makeMatch<int64_t>(type, makeGet(type::Number, property), std::move(convertedStops));
}
);
}
template <typename T>
static std::map<double, std::unique_ptr<Expression>> convertStops(const std::map<float, T>& stops) {
std::map<double, std::unique_ptr<Expression>> convertedStops;
for(const auto& stop : stops) {
convertedStops.emplace(
stop.first,
makeLiteral(stop.second)
);
}
return convertedStops;
}
template <typename T>
static std::unique_ptr<Expression> toExpression(const ExponentialStops<T>& stops)
{
ParsingContext ctx;
ParseResult e = createInterpolate(valueTypeToExpressionType<T>(),
ExponentialInterpolator(stops.base),
makeZoom(),
convertStops(stops.stops),
ctx);
assert(e);
return std::move(*e);
}
template <typename T>
static std::unique_ptr<Expression> toExpression(const IntervalStops<T>& stops)
{
ParseResult e(std::make_unique<Step>(valueTypeToExpressionType<T>(),
makeZoom(),
convertStops(stops.stops)));
assert(e);
return std::move(*e);
}
template <typename T>
static std::unique_ptr<Expression> toExpression(const std::string& property,
const ExponentialStops<T>& stops)
{
ParsingContext ctx;
ParseResult e = createInterpolate(valueTypeToExpressionType<T>(),
ExponentialInterpolator(stops.base),
makeGet(type::Number, property),
convertStops(stops.stops),
ctx);
assert(e);
return std::move(*e);
}
template <typename T>
static std::unique_ptr<Expression> toExpression(const std::string& property,
const IntervalStops<T>& stops)
{
std::unique_ptr<Expression> get = makeGet(type::Number, property);
ParseResult e(std::make_unique<Step>(valueTypeToExpressionType<T>(),
std::move(get),
convertStops(stops.stops)));
assert(e);
return std::move(*e);
}
template <typename T>
static std::unique_ptr<Expression> toExpression(const std::string& property,
const CategoricalStops<T>& stops)
{
ParseResult expr = fromCategoricalStops(stops.stops, property);
assert(expr);
return std::move(*expr);
}
// interpolatable zoom curve
template <typename T>
static typename std::enable_if_t<util::Interpolatable<T>::value,
ParseResult> makeZoomCurve(std::map<double, std::unique_ptr<Expression>> stops) {
ParsingContext ctx;
return createInterpolate(valueTypeToExpressionType<T>(),
ExponentialInterpolator(1.0),
makeZoom(),
std::move(stops),
ctx);
}
// non-interpolatable zoom curve
template <typename T>
static typename std::enable_if_t<!util::Interpolatable<T>::value,
ParseResult> makeZoomCurve(std::map<double, std::unique_ptr<Expression>> stops) {
return ParseResult(std::make_unique<Step>(valueTypeToExpressionType<T>(), makeZoom(), std::move(stops)));
}
template <typename T>
static std::unique_ptr<Expression> toExpression(const std::string& property,
const CompositeExponentialStops<T>& stops)
{
ParsingContext ctx;
std::map<double, std::unique_ptr<Expression>> outerStops;
for (const std::pair<float, std::map<float, T>>& stop : stops.stops) {
ParseResult innerInterpolate = createInterpolate(valueTypeToExpressionType<T>(),
ExponentialInterpolator(stops.base),
makeGet(type::Number, property),
convertStops(stop.second),
ctx);
assert(innerInterpolate);
outerStops.emplace(stop.first, std::move(*innerInterpolate));
}
ParseResult zoomCurve = makeZoomCurve<T>(std::move(outerStops));
assert(zoomCurve);
return std::move(*zoomCurve);
}
template <typename T>
static std::unique_ptr<Expression> toExpression(const std::string& property,
const CompositeIntervalStops<T>& stops)
{
std::map<double, std::unique_ptr<Expression>> outerStops;
for (const std::pair<float, std::map<float, T>>& stop : stops.stops) {
std::unique_ptr<Expression> get = makeGet(type::Number, property);
ParseResult innerInterpolate(std::make_unique<Step>(valueTypeToExpressionType<T>(),
std::move(get),
convertStops(stop.second)));
assert(innerInterpolate);
outerStops.emplace(stop.first, std::move(*innerInterpolate));
}
ParseResult zoomCurve = makeZoomCurve<T>(std::move(outerStops));
assert(zoomCurve);
return std::move(*zoomCurve);
}
template <typename T>
static std::unique_ptr<Expression> toExpression(const std::string& property,
const CompositeCategoricalStops<T>& stops)
{
std::map<double, std::unique_ptr<Expression>> outerStops;
for (const std::pair<float, std::map<CategoricalValue, T>>& stop : stops.stops) {
ParseResult innerInterpolate = fromCategoricalStops(stop.second, property);
assert(innerInterpolate);
outerStops.emplace(stop.first, std::move(*innerInterpolate));
}
ParseResult zoomCurve = makeZoomCurve<T>(std::move(outerStops));
assert(zoomCurve);
return std::move(*zoomCurve);
}
template <typename T>
static std::unique_ptr<Expression> toExpression(const std::string& property,
const IdentityStops<T>&)
{
return fromIdentityFunction(property, expression::valueTypeToExpressionType<T>());
}
private:
static std::unique_ptr<Expression> fromIdentityFunction(const std::string& property, type::Type type);
};
} // namespace expression
} // namespace style
} // namespace mbgl
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