# 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