module Byebug::ParseFunctions

Utilities to assist command parsing

Public Instance Methods

get_int(str, cmd, min = nil, max = nil) click to toggle source

Parse 'str' of command 'cmd' as an integer between min and max. If either min or max is nil, that value has no bound.

# File lib/byebug/helper.rb, line 74
def get_int(str, cmd, min = nil, max = nil)
  if str !~ /\A[0-9]+\z/
    return nil, pr('parse.errors.int.not_number', cmd: cmd, str: str)
  end

  int = str.to_i
  if min && int < min
    return min, pr('parse.errors.int.too_low', cmd: cmd, str: str, min: min)
  elsif max && int > max
    return max, pr('parse.errors.int.too_high',
                   cmd: cmd, str: str, max: max)
  end

  int
end
parse_steps(str, cmd) click to toggle source

Returns the number of steps specified in <str> as an integer or 1 if <str> is empty.

# File lib/byebug/helper.rb, line 122
def parse_steps(str, cmd)
  return 1 unless str

  steps, err = get_int(str, cmd, 1)
  return nil, err unless steps

  steps
end
syntax_valid?(code) click to toggle source

Returns true if code is syntactically correct for Ruby

# File lib/byebug/helper.rb, line 93
def syntax_valid?(code)
  return true unless code

  without_stderr do
    begin
      RubyVM::InstructionSequence.compile(code)
      true
    rescue SyntaxError
      false
    end
  end
end
without_stderr() { || ... } click to toggle source

Temporarily disable output to $stderr

# File lib/byebug/helper.rb, line 109
def without_stderr
  stderr = $stderr
  $stderr.reopen(IO::NULL)

  yield
ensure
  $stderr.reopen(stderr)
end