CODEX revised with following function: 1. GDS building, 2. different user group with different authority.

backend/routed_layout_preview.py

@@ -0,0 +1,51 @@
+import os
+import sys
+import tempfile
+
+import yaml
+
+
+def create_routed_layout_svg(
+    yaml_content: str,
+    output_path: str,
+    pdk_root: str,
+    project_dir: str,
+    technology_manifest_path: str = None,
+    prefer_full_gds: bool = False,
+) -> str:
+    """Create an SVG preview from routed GDS geometry generated by mxpic_router."""
+    import gdstk
+
+    layout = yaml.safe_load(yaml_content) or {}
+    cell_name = str(layout.get("name") or "layout")
+    router_root = os.path.abspath(os.path.join(os.path.dirname(__file__), "..", "..", "mxpic_router"))
+    if os.path.isdir(router_root) and router_root not in sys.path:
+        sys.path.insert(0, router_root)
+    from mxpic_router import build_project_gds
+
+    os.makedirs(os.path.dirname(output_path), exist_ok=True)
+    with tempfile.TemporaryDirectory(prefix="mxpic_routed_preview_") as temp_dir:
+        temp_gds = os.path.join(temp_dir, f"{cell_name}.gds")
+        build_project_gds(
+            project_dir=project_dir,
+            output_path=temp_gds,
+            pdk_root=pdk_root,
+            technology_manifest_path=technology_manifest_path,
+            prefer_full_gds=prefer_full_gds,
+            target_cell_name=cell_name,
+        )
+        library = gdstk.read_gds(temp_gds)
+        top_cells = library.top_level()
+        if not top_cells:
+            raise RuntimeError("Routed preview GDS has no top-level cell")
+        top_cells[0].write_svg(output_path)
+    return output_path
+
+
+def layout_has_links(yaml_content: str) -> bool:
+    layout = yaml.safe_load(yaml_content) or {}
+    for bundle in (layout.get("bundles") or {}).values():
+        links = bundle.get("links") or []
+        if links:
+            return True
+    return False