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#include <mbgl/style/expression/get_covering_stops.hpp>
namespace mbgl {
namespace style {
namespace expression {
Range<float> getCoveringStops(const std::map<double, std::unique_ptr<Expression>>& stops,
const double lower, const double upper) {
assert(!stops.empty());
auto minIt = stops.lower_bound(lower);
auto maxIt = stops.lower_bound(upper);
// lower_bound yields first element >= lowerZoom, but we want the *last*
// element <= lowerZoom, so if we found a stop > lowerZoom, back up by one.
if (minIt != stops.begin() && minIt != stops.end() && minIt->first > lower) {
minIt--;
}
return Range<float> {
static_cast<float>(minIt == stops.end() ? stops.rbegin()->first : minIt->first),
static_cast<float>(maxIt == stops.end() ? stops.rbegin()->first : maxIt->first)
};
}
} // namespace expression
} // namespace style
} // namespace mbgl
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