Problem when visualize AST with graphviz-java

[ghost]

I want to visualize an AST for the following expression: 1 + 2 + 3 == 6

I would expect something like this to happen:

Notice that I have to pad the label of each node with ID - *. If I do not add the padding, the tree would look like following

Notices the operator + appears twice but will be treated as only one node and so references itself.

How can I bypass this problem?

[maxweissboeck]

Each Node needs to have its own node id, but you can give different nodes the same display name / label. Example N1 and N2 are different nodes, but each of them can have the label “+“ for display. See the Graphviz documentation, it‘s all there.

[ghost]

Each Node needs to have its own node id, but you can give different nodes the same display name / label. Example N1 and N2 are different nodes, but each of them can have the label “+“ for display. See the Graphviz documentation, it‘s all there.

I am aware of your point. The implementation of the library however assigns each node's id with its label and there does not seem to be a solution for this problem. That is the whole point of my issue.

[ghost]

I found a hack around this problem by assigning each node's label with random unique ID and regex the SVG output of the library with original label. Not a really nice solution, but it works for my purpose.

[maxweissboeck]

Could you provide an example? The dot file? Cause I use it a lot and I never ever had this problem.

[nidi3]

I'm not sure, but do you miss the label attribute? node("id 3").with(Label.of("+"))