feat(xcui): advance core and editor validation flow

engine/include/XCEngine/UI/Runtime/UIScreenTypes.h

@@ -1,6 +1,8 @@
 #pragma once
 
 #include <XCEngine/Resources/UI/UIDocumentTypes.h>
+#include <XCEngine/UI/Style/Theme.h>
+#include <XCEngine/UI/Style/StyleSet.h>
 #include <XCEngine/UI/DrawData.h>
 
 #include <cstddef>
@@ -30,7 +32,10 @@ struct UIScreenDocument {
     std::vector<std::string> dependencies = {};
     Resources::UIDocumentModel viewDocument = {};
     Resources::UIDocumentModel themeDocument = {};
+    Style::UITheme runtimeTheme = {};
+    Style::UIStyleSheet runtimeStyleSheet = {};
     bool hasThemeDocument = false;
+    bool hasRuntimeTheme = false;
 
     bool IsValid() const {
         return !sourcePath.empty();
@@ -39,6 +44,14 @@ struct UIScreenDocument {
     const Resources::UIDocumentModel* GetThemeDocument() const {
         return hasThemeDocument ? &themeDocument : nullptr;
     }
+
+    const Style::UITheme* GetRuntimeTheme() const {
+        return hasRuntimeTheme ? &runtimeTheme : nullptr;
+    }
+
+    const Style::UIStyleSheet* GetRuntimeStyleSheet() const {
+        return hasRuntimeTheme ? &runtimeStyleSheet : nullptr;
+    }
 };
 
 struct UIScreenLoadResult {

engine/include/XCEngine/UI/Style/DocumentStyleCompiler.h

@@ -0,0 +1,33 @@
+#pragma once
+
+#include "StyleResolver.h"
+
+#include <XCEngine/Resources/UI/UIDocumentTypes.h>
+
+#include <string>
+
+namespace XCEngine {
+namespace UI {
+namespace Style {
+
+struct UIDocumentStyleCompileResult {
+    bool succeeded = false;
+    std::string errorMessage = {};
+    UITheme theme = {};
+    UIStyleSheet styleSheet = {};
+};
+
+UIDocumentStyleCompileResult CompileDocumentStyle(
+    const Resources::UIDocumentModel& themeDocument);
+
+bool TryCompileDocumentStyle(
+    const Resources::UIDocumentModel& themeDocument,
+    UITheme& outTheme,
+    UIStyleSheet& outStyleSheet,
+    std::string* outErrorMessage = nullptr);
+
+UIStyleSet BuildInlineStyle(const Resources::UIDocumentNode& node);
+
+} // namespace Style
+} // namespace UI
+} // namespace XCEngine