Begin Expression Parent Rule

If Python is in the "begin_expr" state and "Expression" is a function call, then copy "Expression" (function call) to the "Parents" stack. Later, when "Expression" is updated to the child expressions, LW Python does not lose the parent expression since it is saved in "Parents."

if the following are true:

  • expression state at time t = "begin_expr"
  • the expression at time t = function call with name: name and arguments: args

then parent stack at time (t + 1) = [ function call with name: name and arguments: args, parent stack at time t ]

For example,

if the following are true:

  • expression state at time 1 = "begin_expr"
  • the expression at time 1 = __add__(5, 2)

then parent stack at time (1 + 1) = [ __add__(5, 2), parent stack at time 2 ]

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