69 lines
1.3 KiB
Ruby
69 lines
1.3 KiB
Ruby
# coding: utf-8
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# frozen_string_literal: true
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require "readline"
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require "./lib/parser.rb"
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module Rpn
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class Repl
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def initialize
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@parser = Parser.new
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@stack = []
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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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directory_list = Dir.glob("#{s}*")
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if directory_list.positive?
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directory_list
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else
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Readline::HISTORY.grep(/^#{Regexp.escape(s)}/)
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end
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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 == "exit"
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# Remove blank lines from history
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Readline::HISTORY.pop if input.empty?
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process_input( input )
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print_stack
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end
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end
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def process_input( input )
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@parser.parse_input( input ).each do |elt|
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@stack << elt
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end
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end
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def format_element( elt )
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pp elt
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# case elt[:type]
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# when :program
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# "« #{elt[:value]} »"
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# when :string
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# "\"#{elt[:value]}\""
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# when :name
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# "'#{elt[:value]}'"
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# else
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elt[:value]
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# end
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end
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def print_stack
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stack_size = @stack.size
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@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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end
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Rpn::Repl.new.run
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