1 files changed, 87 insertions, 0 deletions
diff --git a/snips_inference_agl/exceptions.py b/snips_inference_agl/exceptions.py
new file mode 100644
index 0000000..b1037a1
--- /dev/null
+++ b/snips_inference_agl/exceptions.py
@@ -0,0 +1,87 @@
+from snips_inference_agl.__about__ import __model_version__
+
+
+class SnipsNLUError(Exception):
+    """Base class for exceptions raised in the snips-nlu library"""
+
+
+class IncompatibleModelError(Exception):
+    """Raised when trying to load an incompatible NLU engine
+
+    This happens when the engine data was persisted with a previous version of
+    the library which is not compatible with the one used to load the model.
+    """
+
+    def __init__(self, persisted_version):
+        super(IncompatibleModelError, self).__init__(
+            "Incompatible data model: persisted model=%s, python lib model=%s"
+            % (persisted_version, __model_version__))
+
+
+class InvalidInputError(Exception):
+    """Raised when an incorrect input is passed to one of the APIs"""
+
+
+class NotTrained(SnipsNLUError):
+    """Raised when a processing unit is used while not fitted"""
+
+
+class IntentNotFoundError(SnipsNLUError):
+    """Raised when an intent is used although it was not part of the
+    training data"""
+
+    def __init__(self, intent):
+        super(IntentNotFoundError, self).__init__("Unknown intent '%s'"
+                                                  % intent)
+
+
+class DatasetFormatError(SnipsNLUError):
+    """Raised when attempting to create a Snips NLU dataset using a wrong
+    format"""
+
+
+class EntityFormatError(DatasetFormatError):
+    """Raised when attempting to create a Snips NLU entity using a wrong
+    format"""
+
+
+class IntentFormatError(DatasetFormatError):
+    """Raised when attempting to create a Snips NLU intent using a wrong
+    format"""
+
+
+class AlreadyRegisteredError(SnipsNLUError):
+    """Raised when attempting to register a subclass which is already
+    registered"""
+
+    def __init__(self, name, new_class, existing_class):
+        msg = "Cannot register %s for %s as it has already been used to " \
+              "register %s" \
+              % (name, new_class.__name__, existing_class.__name__)
+        super(AlreadyRegisteredError, self).__init__(msg)
+
+
+class NotRegisteredError(SnipsNLUError):
+    """Raised when trying to use a subclass which was not registered"""
+
+    def __init__(self, registrable_cls, name=None, registered_cls=None):
+        if name is not None:
+            msg = "'%s' has not been registered for type %s. " \
+                  % (name, registrable_cls)
+        else:
+            msg = "subclass %s has not been registered for type %s. " \
+                  % (registered_cls, registrable_cls)
+        msg += "Use @BaseClass.register('my_component') to register a subclass"
+        super(NotRegisteredError, self).__init__(msg)
+
+class PersistingError(SnipsNLUError):
+    """Raised when trying to persist a processing unit to a path which already
+    exists"""
+
+    def __init__(self, path):
+        super(PersistingError, self).__init__("Path already exists: %s"
+                                              % str(path))
+        
+class LoadingError(SnipsNLUError):
+    """Raised when trying to load a processing unit while some files are
+    missing"""