Escape double quotes in graphviz labels (#235)

* escape double quotes in graphviz labels

Signed-off-by: Nathanael DEMACON <[email protected]>

* rename the variable label

Signed-off-by: Nathanael DEMACON <[email protected]>

---------

Signed-off-by: Nathanael DEMACON <[email protected]>
Co-authored-by: Nathanael DEMACON <[email protected]>

Author: quantumsheep

treelib/tree.py

@@ -1097,7 +1097,8 @@ def to_graphviz(
                 sorting=sorting,
             ):
                 nid = self[n].identifier
-                state = '"{0}" [label="{1}", shape={2}]'.format(nid, self[n].tag, shape)
+                label = str(self[n].tag).translate(str.maketrans({'"': r"\""}))
+                state = '"{0}" [label="{1}", shape={2}]'.format(nid, label, shape)
                 nodes.append(state)
 
                 for c in self.children(nid):