feat: themes

backend/uframe/parser.py

@@ -426,6 +426,11 @@ def _parse_line(keyword: str, args: list[str], line_num: int) -> IRNode:
         content = " ".join([keyword] + args)
         return Text(content=content, source_line=line_num)
 
+    elif keyword == "theme":
+        # theme "name" — sets the page theme (handled as _StyleDirective on Page)
+        theme_name = args[0] if args else "default"
+        return _ThemeDirective(theme_name, line_num)
+
     elif keyword == "component":
         # component name(arg1, arg2)
         raw = " ".join(args)
@@ -450,6 +455,13 @@ def _parse_line(keyword: str, args: list[str], line_num: int) -> IRNode:
         return ComponentUse(comp_name=keyword, args=args, source_line=line_num)
 
 
+class _ThemeDirective(IRNode):
+    """Temporary node — sets theme_name on the Page during tree building."""
+    def __init__(self, theme_name: str, line_num: int):
+        super().__init__(source_line=line_num)
+        self.theme_name = theme_name
+
+
 class _UseDirective(IRNode):
     """Temporary node — triggers library loading during tree building."""
     def __init__(self, lib_path: str, line_num: int):
@@ -756,12 +768,17 @@ def parse(source: str, components: dict[str, ComponentDef] | None = None) -> Pag
             stack.pop()
 
         if isinstance(node, _StyleDirective):
-            # Apply style directive to the current top of stack (parent)
             if stack:
                 parent = stack[-1][1]
                 setattr(parent.style, node.attr, node.value)
             continue
 
+        if isinstance(node, _ThemeDirective):
+            # Set theme on the root Page
+            if root and isinstance(root, Page):
+                root.theme_name = node.theme_name
+            continue
+
         # Table children: columns and rows are absorbed by the Table node
         if isinstance(node, _TableColumns):
             if stack and isinstance(stack[-1][1], Table):