Class: Python::REPL

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

Constant Summary collapse

ParsingError = 
Class.new(RuntimeError)

Instance Method Summary collapse

Constructor Details

#initialize(output) ⇒ REPL

Returns a new instance of REPL.



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

def initialize(output)
  @output = output
  @env = Environment.new
end

Instance Method Details

#eval(exp) ⇒ Object 



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# File 'lib/python/repl.rb', line 31

def eval(exp)
  exp.eval(@env)
end

#print(obj) ⇒ Object 



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# File 'lib/python/repl.rb', line 35

def print(obj)
  if obj == nil
    @output.print ""
  else
    @output.puts obj.inspect
  end
end

#prompt ⇒ Object 



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# File 'lib/python/repl.rb', line 43

def prompt
  @output.print "python.rb> "
end

#read(code) ⇒ Object 



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# File 'lib/python/repl.rb', line 21

def read(code)
  parser = Parser::StatementParser.stmt_list
  result = parser.parse(code)
  if result.is_a?(Parser::Succeeded) && result.rest.chomp == ""
    result.parsed
  else
    raise ParsingError.new
  end
end

#read_eval_print(code) ⇒ Object 



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# File 'lib/python/repl.rb', line 17

def read_eval_print(code)
  print(eval(read(code)))
end

#start ⇒ Object 



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# File 'lib/python/repl.rb', line 13

def start
  prompt
end