update

backend/technology_manifest.py

@@ -0,0 +1,41 @@
+# -----------------------------------------------------------------------------
+# Description: Technology manifest loading and fallback helpers for routing layers and cross-section defaults.
+# Inside functions: technology_manifest_path, read_technology_manifest
+# Developer : Qin Yue @ 2026
+# Organization : OptiHK Limited
+# -----------------------------------------------------------------------------
+import os
+
+import yaml
+
+
+class TechnologyManifestError(Exception):
+    """Exception raised when a technology manifest cannot be found or parsed."""
+    pass
+
+
+def technology_manifest_path(pdks_root: str, foundry: str, technology: str) -> str:
+    """Build the expected path to a foundry/technology manifest YAML file."""
+    base = os.path.abspath(pdks_root)
+    path = os.path.abspath(os.path.join(base, foundry, technology, "technology.yml"))
+    # Keep user-provided foundry/technology names from escaping the configured
+    # PDK root.
+    if not path.startswith(base + os.sep):
+        raise TechnologyManifestError("Invalid technology path")
+    return path
+
+
+def read_technology_manifest(pdks_root: str, foundry: str, technology: str) -> dict:
+    """Load and validate the active technology manifest for the frontend."""
+    path = technology_manifest_path(pdks_root, foundry, technology)
+    if not os.path.exists(path):
+        raise TechnologyManifestError("technology manifest not generated; run mxpic_forge technology export workflow")
+    with open(path, "r", encoding="utf-8") as file:
+        manifest = yaml.safe_load(file) or {}
+    # The frontend route editor depends on both xsection definitions and global
+    # defaults being present before it can safely style or build links.
+    if not isinstance(manifest.get("xsections"), dict):
+        raise TechnologyManifestError("technology manifest is missing xsections")
+    if not isinstance(manifest.get("defaults"), dict):
+        raise TechnologyManifestError("technology manifest is missing defaults")
+    return manifest