Class: Kalc::Repl

Inherits:
Object
  • Object
show all
Defined in:
lib/kalc/repl.rb

Instance Method Summary collapse

Instance Method Details

#heading ⇒ Object 



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# File 'lib/kalc/repl.rb', line 57

def heading
  %q{
    This is Kalc, a small line-based language.
    More information about Kalc can be found at https://github.com/mrcsparker/kalc.

    Kalc is free software, provided as is, with no warranty.
  }
end

#load_env ⇒ Object 



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# File 'lib/kalc/repl.rb', line 8

def load_env
  @kalc = Kalc::Runner.new(true)
end

#run ⇒ Object 



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# File 'lib/kalc/repl.rb', line 12

def run
  puts heading

  # Load Kalc with debug
  load_env

  puts 'You are ready to go.  Have fun!'
  puts ''

  function_list = %w(quit exit functions variables ast) + @kalc.interpreter.env.functions.map { |f| f.first }

  begin
    comp = proc { |s| function_list.grep(/^#{Regexp.escape(s)}/) }
    Readline.completion_append_character = ''
    Readline.completion_proc = comp

    while input = Readline.readline("kalc-#{Kalc::VERSION} > ", true)
      begin
        case
        when (input == 'quit' || input == 'exit')
          break
        when input == 'functions'
          puts @kalc.interpreter.env.functions.map { |f| f.first }.join(', ')
        when input == 'variables'
          puts @kalc.interpreter.env.variables.map { |v| "#{v[0]} = #{v[1]}" }.join("\n\r")
        when input == 'reload'
          load_env
        when input == 'ast'
          pp @kalc.ast
        when input != ''
          puts @kalc.run(input)
        end
      rescue Parslet::ParseFailed => e
        puts e, g.root.error_tree
      rescue Exception => e
        puts e
        puts e.backtrace
      end
    end
  rescue Exception => e
    puts e
    puts e.backtrace
  end
end