demarches-normaliennes/app/models/condition_form.rb

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class ConditionForm
include ActiveModel::Model
include Logic
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attr_accessor :top_operator_name, :rows, :upper_tdcs
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def to_condition
case sub_conditions.count
when 0
nil
when 1
sub_conditions.first
else
top_operator_class.new(sub_conditions)
end
end
def delete_row(i)
rows.slice!(i)
self
end
def change_champ(i)
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sub_conditions[i] = Logic.ensure_compatibility_from_left(sub_conditions[i], upper_tdcs)
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self
end
private
def top_operator_class
Logic.class_from_name(top_operator_name)
end
def sub_conditions
@sub_conditions ||= rows.map { |row| row_to_condition(row) }
end
def row_to_condition(row)
left = Logic.from_json(row[:targeted_champ])
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right = parse_value(left.type(upper_tdcs), row[:value])
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Logic.class_from_name(row[:operator_name]).new(left, right)
end
def parse_value(left_type, value)
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return empty if value.blank?
if left_type == :number
# in this special case, we try to cast as Integer
# but it can still be a previous string value or a mistap
number = Integer(value) rescue nil
return constant(number) if number
end
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# otherwise it can be a serialized Constant(true | false) term
# or a serialized Empty term
term = Logic.from_json(value) rescue nil
return term if term.present?
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# if anything else, save it as a constant of string
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constant(value)
end
end