Action Tree vs AST
Put simply, the action tree is the AST with context. That context is info such as what type a function returns, or that two places in which a variable is used are in fact using the same variable.
Because it needs to figure out and remember all this context, the code that generates the action tree needs lots of namespace lookup tables and other thingamabobs.
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Running the Action Tree
Once we have the action tree, running the code is easy. Each action node has a function ‘execute’ which takes some input, does whatever the action should (including possibly calling sub action) and returns the action’s output. This is the interpreter in action.
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