52 lines
1,022 B
Ruby
52 lines
1,022 B
Ruby
# frozen_string_literal: true
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require 'readline'
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require './language'
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class RplRepl
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def initialize
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@lang = Rpl::Language.new
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end
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def run
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Readline.completion_proc = proc do |s|
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Readline::HISTORY.grep(/^#{Regexp.escape(s)}/)
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end
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Readline.completion_append_character = ' '
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loop do
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input = Readline.readline( ' ', true )
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break if input.nil? || input == 'quit'
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pp Readline::HISTORY if input == 'history'
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input = '"rpn.rb version 0.0"' if %w[version uname].include?( input )
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# Remove blank lines from history
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Readline::HISTORY.pop if input.empty?
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begin
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@lang.run( input )
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rescue ArgumentError, ZeroDivisionError => e
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p e
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end
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print_stack
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end
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end
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def format_element( elt )
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Rpl::Lang.to_string( elt )
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end
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def print_stack
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stack_size = @lang.stack.size
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@lang.stack.each_with_index do |elt, i|
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puts "#{stack_size - i}: #{format_element( elt )}"
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end
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end
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end
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RplRepl.new.run
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