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[core] Add feature-state compound expression

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This commit is contained in:
Juha Alanen
2019-08-21 14:29:57 +03:00
committed by Juha Alanen
parent 9e262ee55f
commit 91171bc1a9
1 changed files with 15 additions and 0 deletions
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15
src/mbgl/style/expression/compound_expression.cpp
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@@ -675,6 +675,20 @@ const auto& errorCompoundExpression() {
return signature;
}
const auto& featureStateCompoundExpression() {
static auto signature = detail::makeSignature("feature-state", [](const EvaluationContext& params, const std::string& key) -> Result<Value> {
mbgl::Value state;
if (params.featureState) {
auto it = params.featureState->find(key);
if (it != params.featureState->end()) {
state = mbgl::Value(it->second);
}
}
return toExpressionValue(state);
});
return signature;
}
// Legacy Filters
const auto& filterEqualsCompoundExpression() {
static auto signature = detail::makeSignature("filter-==", [](const EvaluationContext& params, const std::string& key, const Value &lhs) -> Result<bool> {
@@ -921,6 +935,7 @@ MAPBOX_ETERNAL_CONSTEXPR const auto compoundExpressionRegistry = mapbox::eternal
{ "concat", concatCompoundExpression },
{ "resolved-locale", resolvedLocaleCompoundExpression },
{ "error", errorCompoundExpression },
{ "feature-state", featureStateCompoundExpression },
// Legacy Filters
{ "filter-==", filterEqualsCompoundExpression },
{ "filter-id-==", filterIdEqualsCompoundExpression },