Added DevState

state/devstate.py

@@ -0,0 +1,47 @@
+from .pystate import PyState
+
+
+class DevState(PyState):
+    """
+    Version of PyState that allows dumping to .dot files
+    + node id's are generated sequentially to make writing tests easier
+    """
+
+    free_id = 0
+
+    def __init__(self):
+        super().__init__()
+
+    @staticmethod
+    def new_id() -> str:
+        DevState.free_id += 1
+        return str(DevState.free_id - 1)
+
+    def dump(self, path: str, png_path: str = None):
+        """Dumps the whole MV graph to a graphviz .dot-file
+
+        Args:
+            path (str): path for .dot-file
+            png_path (str, optional): path for .png image generated from the .dot-file. Defaults to None.
+        """
+        with open(path, "w") as f:
+            f.write("digraph main {\n")
+            for n in sorted(self.nodes):
+                if n in self.values:
+                    f.write("\"a_%s\" [label=\"%s\"];\n" % (
+                        n, str(self.values[n]).replace('"', '\\"')))
+                else:
+                    f.write("\"a_%s\" [label=\"\"];\n" % n)
+            for i, e in sorted(list(self.edges.items())):
+                f.write("\"a_%s\" [label=\"e_%s\" shape=point];\n" % (i, i))
+                f.write("\"a_%s\" -> \"a_%s\" [arrowhead=none];\n" % (e[0], i))
+                f.write("\"a_%s\" -> \"a_%s\";\n" % (i, e[1]))
+            f.write("}")
+
+        if png_path is not None:
+            # generate png from dot-file
+            bashCommand = f"dot -Tpng {path} -o {png_path}"
+            import subprocess
+            process = subprocess.Popen(
+                bashCommand.split(), stdout=subprocess.PIPE)
+            output, error = process.communicate()