Slavasil
1fff529e83
- implement interpreter and demo - replace StandardError with appropriate subclasses - implement division - rewrite Polynomial.simplify()
73 lines
1.6 KiB
Ruby
73 lines
1.6 KiB
Ruby
# frozen_string_literal: true
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module RubyAlgebra
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# Команда интерпретатора
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class Command
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attr_reader :type
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def type
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raise NotImplementedError
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end
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end
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# Команда присвоения
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class AssignmentCommand < Command
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attr_reader :lhs, :operation, :operand1, :operand2
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def initialize(lhs, operation, operand1, operand2)
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@lhs = lhs
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@operation = operation
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@operand1 = operand1
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@operand2 = operand2
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end
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def to_s
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result = "Assignment command: "
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result += @lhs.is_a?(Array) ? @lhs.join(', ') : @lhs.to_s
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if @operation == :diff
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result += ' := Diff(' + @operand1.to_s + @operand2.map { |v| ", #{v}"}.join + ')'
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elsif @operation == :subs
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result += ' := Subs(' + @operand1.to_s + @operand2.map { |variable, value| ", #{variable}=#{value}"}.join + ')'
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else
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result += ' := ' + @operand1.to_s
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case @operation
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when :add
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result += ' + '
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when :sub
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result += ' - '
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when :mult, :scale
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result += ' * '
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when :div
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result += ' / '
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end
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result += @operand2.to_s if @operation != :assign
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end
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result
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end
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def type
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:assignment
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end
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end
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# Команда вывода на экран
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class DisplayCommand < Command
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attr_reader :item
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def initialize(item)
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@type = :display
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@item = item
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end
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def to_s
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result = "Display command: "
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result += @item.to_s
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result
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end
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def type
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:display
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end
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end
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end
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