hdf5 support

backend/importers/__init__.py

@@ -0,0 +1,45 @@
+"""
+File importer registry.
+
+Each module in this package exposes:
+  extensions   frozenset[str]       – lower-case extensions it handles
+  calibrated   bool                 – True when physical dimensions are known
+  load(path)   → list[DataField]    – load all channels
+  channel_names(path) → list[str]   – channel name strings (same order as load)
+
+Usage::
+
+    from backend.importers import get_importer, all_extensions
+
+    importer = get_importer(".gwy")   # returns the gwy module, or None
+"""
+
+from __future__ import annotations
+
+from pathlib import Path
+from types import ModuleType
+
+from backend.importers import array_image, ergo_hdf5, gwy, ibw, sxm
+
+_IMPORTERS: list[ModuleType] = [gwy, sxm, ibw, ergo_hdf5, array_image]
+
+# ext → importer module
+_REGISTRY: dict[str, ModuleType] = {}
+for _mod in _IMPORTERS:
+    for _ext in _mod.extensions:
+        _REGISTRY[_ext] = _mod
+
+
+def get_importer(ext: str) -> ModuleType | None:
+    """Return the importer module for *ext* (e.g. '.gwy'), or None."""
+    return _REGISTRY.get(ext.lower())
+
+
+def all_extensions() -> frozenset[str]:
+    """All file extensions supported across every registered importer."""
+    return frozenset(_REGISTRY)
+
+
+def calibrated_extensions() -> frozenset[str]:
+    """Extensions whose importers report physical calibration."""
+    return frozenset(ext for ext, mod in _REGISTRY.items() if mod.calibrated)