1 files changed, 30 insertions, 0 deletions
diff --git a/snips_inference_agl/common/from_dict.py b/snips_inference_agl/common/from_dict.py
new file mode 100644
index 0000000..2b776a6
--- /dev/null
+++ b/snips_inference_agl/common/from_dict.py
@@ -0,0 +1,30 @@
+try:
+    import funcsigs as inspect
+except ImportError:
+    import inspect
+
+from future.utils import iteritems
+
+KEYWORD_KINDS = {inspect.Parameter.POSITIONAL_OR_KEYWORD,
+                 inspect.Parameter.KEYWORD_ONLY}
+
+
+class FromDict(object):
+    @classmethod
+    def from_dict(cls, dict):
+        if dict is None:
+            return cls()
+        params = inspect.signature(cls.__init__).parameters
+
+        if any(p.kind == inspect.Parameter.VAR_KEYWORD for p in
+               params.values()):
+            return cls(**dict)
+
+        param_names = set()
+        for i, (name, param) in enumerate(iteritems(params)):
+            if i == 0 and name == "self":
+                continue
+            if param.kind in KEYWORD_KINDS:
+                param_names.add(name)
+        filtered_dict = {k: v for k, v in iteritems(dict) if k in param_names}
+        return cls(**filtered_dict)