LibWeb: Generate property_initial_value() function from Properties.json

Since we have initial-value data in Properties.json already, it makes
sense to use that instead of needing to duplicate the same information
in ComputedValues.h

However, converting a StyleValue to the kind of types used in
InitialValues is non-trivial. So this may or may not actually be useful.

2 files changed, 34 insertions, 0 deletions

diff --git a/Userland/Libraries/LibWeb/CodeGenerators/Generate_CSS_PropertyID_cpp.cpp b/Userland/Libraries/LibWeb/CodeGenerators/Generate_CSS_PropertyID_cpp.cpp
index 22937da989..9852fd57d9 100644
--- a/Userland/Libraries/LibWeb/CodeGenerators/Generate_CSS_PropertyID_cpp.cpp
+++ b/Userland/Libraries/LibWeb/CodeGenerators/Generate_CSS_PropertyID_cpp.cpp
@@ -45,7 +45,9 @@ int main(int argc, char** argv)
 
     generator.append(R"~~~(
 #include <AK/Assertions.h>
+#include <LibWeb/CSS/Parser/Parser.h>
 #include <LibWeb/CSS/PropertyID.h>
+#include <LibWeb/CSS/StyleValue.h>
 
 namespace Web::CSS {
 
@@ -153,6 +155,36 @@ bool is_pseudo_property(PropertyID property_id)
     }
 }
 
+RefPtr<StyleValue> property_initial_value(PropertyID property_id)
+{
+    static HashMap<PropertyID, NonnullRefPtr<StyleValue>> initial_values;
+    if (initial_values.is_empty()) {
+        ParsingContext parsing_context;
+)~~~");
+
+    json.value().as_object().for_each_member([&](auto& name, auto& value) {
+        VERIFY(value.is_object());
+
+        if (value.as_object().has("initial")) {
+            auto& initial_value = value.as_object().get("initial");
+            VERIFY(initial_value.is_string());
+            auto initial_value_string = initial_value.as_string();
+
+            auto member_generator = generator.fork();
+            member_generator.set("name:titlecase", title_casify(name));
+            member_generator.set("initial_value_string", initial_value_string);
+            member_generator.append(R"~~~(
+        if (auto parsed_value = Parser(parsing_context, "@initial_value_string@").parse_as_css_value(PropertyID::@name:titlecase@))
+            initial_values.set(PropertyID::@name:titlecase@, parsed_value.release_nonnull());
+)~~~");
+        }
+    });
+
+    generator.append(R"~~~(
+    }
+    return initial_values.get(property_id).value_or(nullptr);
+}
+
 } // namespace Web::CSS
 
 )~~~");
diff --git a/Userland/Libraries/LibWeb/CodeGenerators/Generate_CSS_PropertyID_h.cpp b/Userland/Libraries/LibWeb/CodeGenerators/Generate_CSS_PropertyID_h.cpp
index 89ad93c4d1..355d77b28f 100644
--- a/Userland/Libraries/LibWeb/CodeGenerators/Generate_CSS_PropertyID_h.cpp
+++ b/Userland/Libraries/LibWeb/CodeGenerators/Generate_CSS_PropertyID_h.cpp
@@ -47,6 +47,7 @@ int main(int argc, char** argv)
 
 #include <AK/StringView.h>
 #include <AK/Traits.h>
+#include <LibWeb/Forward.h>
 
 namespace Web::CSS {
 
@@ -73,6 +74,7 @@ PropertyID property_id_from_string(const StringView&);
 const char* string_from_property_id(PropertyID);
 bool is_inherited_property(PropertyID);
 bool is_pseudo_property(PropertyID);
+RefPtr<StyleValue> property_initial_value(PropertyID);
 
 } // namespace Web::CSS