Class: Calvin::CLI

Inherits:
Object
  • Object
show all
Defined in:
lib/calvin/cli.rb

Instance Method Summary collapse

Constructor Details

#initialize(argv) ⇒ CLI

Returns a new instance of CLI.



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# File 'lib/calvin/cli.rb', line 3

def initialize(argv)
  if argv.any?
    puts "Argument passed: #{argv.inspect}"
  end
  @verbose = argv.include?("--verbose")
  repl
end

Instance Method Details

#repl ⇒ Object 



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# File 'lib/calvin/cli.rb', line 11

def repl
  evaluator = Evaluator.new
  require 'readline'

  puts "Calvin Programming Language REPL."
  puts "Type exit or press Ctrl-D to exit."
  lines = ""
  loop do
    prompt = "> "
    line = Readline::readline(prompt)

    exit if line.nil? || line == "exit"

    Readline::HISTORY.push line

    begin
      ast = AST.new(line).ast

      if @verbose
        puts  "      AST: #{ast.inspect}"
        print "Evaluated: "
      end

      p evaluator.apply(ast)[0]
    rescue Exception => e
      puts e
      p e.message
      puts e.backtrace
    end
  end
end