Call Function Begin State Rule

When the state is "call_function_begin" and "Expression" is not a built-in function, then the state is updated to "call_build_args"

if the following are true:

  • expression state at time t = "call_function_begin"
  • Value Stack at time t = [ values, stack ]
  • the expression at time t = function call with name: name and arguments: args

then expression state at time (t + 1) = "call_build_args"

Updating the state to "call_build_args" indicates that LW Python is ready to start iterating function parameters and argument values.

For example,

if the following are true:

  • expression state at time 10 = "call_function_begin"
  • Value Stack at time 10 = [ [ 5, [ ] ], [ ] ]
  • the expression at time 10 = add_three(a)

then expression state at time (10 + 1) = "call_build_args"

Try stepping through the simulator to see LW Python change state from "call_function_begin" to "call_build_args."

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LW Python State
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