Added first implementation of a document object model (DOM).

1 files changed, 48 insertions, 0 deletions

diff --git a/pyGHDL/dom/Common.py b/pyGHDL/dom/Common.py
new file mode 100644
index 000000000..8baa6537e
--- /dev/null
+++ b/pyGHDL/dom/Common.py
@@ -0,0 +1,48 @@
+from pydecor import export
+
+from pyVHDLModel.VHDLModel import Modes
+
+from libghdl.thin       import name_table
+from libghdl.thin.vhdl  import nodes
+
+__all__ = []
+__api__ = __all__
+
+
+@export
+class GHDLBaseException(Exception):
+	pass
+
+
+@export
+class LibGHDLException(GHDLBaseException):
+	pass
+
+
+@export
+class GHDLException(GHDLBaseException):
+	pass
+
+
+@export
+class GHDLMixin:
+	_MODE_TRANSLATION = {
+		nodes.Iir_Mode.In_Mode:      Modes.In,
+		nodes.Iir_Mode.Out_Mode:     Modes.Out,
+		nodes.Iir_Mode.Inout_Mode:   Modes.InOut,
+		nodes.Iir_Mode.Buffer_Mode:  Modes.Buffer,
+		nodes.Iir_Mode.Linkage_Mode: Modes.Linkage
+	}
+
+	@classmethod
+	def _ghdlNodeToName(cls, node):
+		"""Return the python string from node :param:`node` identifier"""
+		return name_table.Get_Name_Ptr(nodes.Get_Identifier(node)).decode("utf-8")
+
+	@classmethod
+	def _ghdlPortToMode(cls, port):
+		"""Return the mode of a port."""
+		try:
+			return cls._MODE_TRANSLATION[nodes.Get_Mode(port)]
+		except KeyError:
+			raise LibGHDLException("Unknown mode.")