[core] Add possibility of overriding paint properties inside format expression #14062

* [core] Add format override expression and formatted section to evaluation context

* [core] Add textColor to TaggedString's formatted section

* [core] Add FormatSectionOverrides and introduce overridable properties

* [core] Populate symbol layer paint properties for text sections

* [core] Add benchmark for style that uses text-color override

* [core] Add unit test for FormatOverrideExpression

* [core] Add unit test for FormatSectionOverrides

1 files changed, 5 insertions, 0 deletions

diff --git a/src/mbgl/style/layers/layer_properties.hpp.ejs b/src/mbgl/style/layers/layer_properties.hpp.ejs
index 792f858862..89dffdcd42 100644
--- a/src/mbgl/style/layers/layer_properties.hpp.ejs
+++ b/src/mbgl/style/layers/layer_properties.hpp.ejs
@@ -31,6 +31,11 @@ struct <%- camelize(property.name) %> : ColorRampProperty {
 <%   } else { -%>
 struct <%- camelize(property.name) %> : <%- paintPropertyType(property, type) %> {
     static <%- evaluatedType(property) %> defaultValue() { return <%- defaultValue(property) %>; }
+<% if (isOverridable(property)) { -%>
+    static constexpr const char *name() { return "<%- property.name %>"; }
+    static constexpr auto expressionType() { return expression::type::<%- expressionType(property) %>{}; };
+    template<typename T> static bool hasOverride(const T& t) { return !!t.<%- camelizeWithLeadingLowercase(property.name) %>; };
+<% } -%>
 };
 <%   } -%>