class Gobstones::Lang::Commands::MultipleAssignment
Attributes
expression[R]
var_tuple[R]
Public Class Methods
new(var_tuple, expression)
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# File lib/gobstones/lang/commands/multiple_assignment.rb, line 11 def initialize(var_tuple, expression) @var_tuple = var_tuple @expression = expression end
Public Instance Methods
equality_attributes()
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# File lib/gobstones/lang/commands/multiple_assignment.rb, line 16 def equality_attributes %i[var_tuple expression] end
evaluate(context)
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# File lib/gobstones/lang/commands/multiple_assignment.rb, line 20 def evaluate(context) # TODO implement as many simple assignments? validate_expression_is_function_call function_call_result = expression.evaluate(context) check_number_of_arguments(function_call_result) function_call_result.length.times do |index| context.set(var_tuple.variable_at(index), function_call_result[index]) end end
Private Instance Methods
check_number_of_arguments(calling_arguments)
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# File lib/gobstones/lang/commands/multiple_assignment.rb, line 37 def check_number_of_arguments(calling_arguments) raise Runner::WrongArgumentsError, wrong_number_of_arguments_message(calling_arguments) if var_tuple.length != calling_arguments.length end
validate_expression_is_function_call()
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# File lib/gobstones/lang/commands/multiple_assignment.rb, line 32 def validate_expression_is_function_call raise Runner::GobstonesTypeError, 'expected a function call in multiple assignment' unless expression.is_function_call? end
wrong_number_of_arguments_message(calling_arguments)
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# File lib/gobstones/lang/commands/multiple_assignment.rb, line 42 def wrong_number_of_arguments_message(calling_arguments) "Wrong number of arguments in assignment: expected #{var_tuple.length}, got #{calling_arguments.length}" end