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#include <mbgl/util/font_stack.hpp>
#include <mbgl/util/logging.hpp>
#include <mbgl/style/layers/symbol_layer_impl.hpp>
#include <boost/functional/hash.hpp>
#include <boost/algorithm/string/join.hpp>
namespace mbgl {
using namespace style;
std::string fontStackToString(const FontStack& fontStack) {
return boost::algorithm::join(fontStack, ",");
}
std::size_t FontStackHash::operator()(const FontStack& fontStack) const {
return boost::hash_range(fontStack.begin(), fontStack.end());
}
std::set<FontStack> fontStacks(const std::vector<Immutable<style::Layer::Impl>>& layers) {
std::set<FontStack> result;
for (const auto& layer : layers) {
if (layer->type != LayerType::Symbol) {
continue;
}
const SymbolLayer::Impl& impl = dynamic_cast<const SymbolLayer::Impl&>(*layer);
if (impl.layout.get<TextField>().isUndefined()) {
continue;
}
impl.layout.get<TextFont>().match(
[&] (Undefined) {
result.insert({"Open Sans Regular", "Arial Unicode MS Regular"});
},
[&] (const FontStack& constant) {
result.insert(constant);
},
[&] (const auto& function) {
for (const auto& value : function.possibleOutputs()) {
if (value) {
result.insert(*value);
} else {
Log::Warning(Event::ParseStyle, "Layer '%s' has an invalid value for text-font and will not render text. Output values must be contained as literals within the expression.", impl.id.c_str());
break;
}
}
}
);
}
return result;
}
} // namespace mbgl
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