Class: Glaemscribe::API::Glaeml::Shellwords

Inherits:
Object
  • Object
show all
Defined in:
lib/api/glaeml_shellwords.rb

Defined Under Namespace

Classes: Error

Constant Summary collapse

ESCAPE_MODE_UNICODE = 
1

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Shellwords

Returns a new instance of Shellwords.



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# File 'lib/api/glaeml_shellwords.rb', line 31

def initialize
end

Instance Method Details

#advance_inside_arg(l, i) ⇒ Object 



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# File 'lib/api/glaeml_shellwords.rb', line 48

def advance_inside_arg(l,i)
  if l[i] == "\\"
    @is_escaping      = true
    @escape_mode      = nil
  else
    @current_arg += l[i]
  end
end

#advance_inside_escape(l, i) ⇒ Object 



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# File 'lib/api/glaeml_shellwords.rb', line 57

def advance_inside_escape(l,i)
  if !@escape_mode
    # We don't now yet what to do.
    case l[i]
    when 'n'
      @current_arg << "\n"
      @is_escaping = false
      return
    when "\\"
      @current_arg << "\\"
      @is_escaping = false
    when 't'
      @current_arg << "\t"
      @is_escaping = false
    when "\""
      @current_arg << "\""
      @is_escaping = false
    when "u"
      @escape_mode            = ESCAPE_MODE_UNICODE
      @unicode_escape_counter = 0
      @unicode_escape_str     = ''
    else
      raise Error, "Unknown escapment : \\#{l[i]}"
    end
  else
    case @escape_mode
    when ESCAPE_MODE_UNICODE
      c = l[i].downcase

      if !(c =~ /[0-9a-f]/)
        raise Error, 'Wrong format for unicode escaping, should be \u with 4 hex digits'
      end

      @unicode_escape_counter += 1
      @unicode_escape_str     += c
      if @unicode_escape_counter == 4
        @is_escaping = false
        @current_arg += [@unicode_escape_str.hex].pack("U")
      end

    else
      raise Error, "Unimplemented escape mode"
    end
  end
    
end

#parse(l) ⇒ Object 



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# File 'lib/api/glaeml_shellwords.rb', line 104

def parse(l)
  reset_state
    
  i = 0
  l.length.times{ |i|

    if !@is_eating_arg
      next if l[i] =~ /\s/
      
      raise Error, "Glaeml strictly uses double quotes, not simple quotes for args" if l[i] == "'"
      
      @is_eating_arg             = true
      @is_eating_arg_between_quotes = (l[i] == "\"")
      @current_arg << l[i] if !@is_eating_arg_between_quotes
    else
      # Eating arg
      if @is_escaping
        advance_inside_escape(l,i)
      else
        if !@is_eating_arg_between_quotes
          if l[i] =~ /[\s"]/
            @args << @current_arg
            @current_arg = ""
            @is_eating_arg             = (l[i] == "\"") # Starting a new arg directly
            @is_eating_arg_between_quotes = @is_eating_arg
            next
          else
            advance_inside_arg(l,i)
          end
        else
          if l[i] == "\""
            @args << @current_arg
            @current_arg    = ""
            @is_eating_arg  = false
          else
            advance_inside_arg(l,i)
          end
        end
      end
    end
  }
    
  if @is_eating_arg && @is_eating_arg_between_quotes
    raise Error, "Unmatched quote."
  end
  
  @args << @current_arg if !@current_arg.empty?
    
  @args
end

#reset_state ⇒ Object 



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# File 'lib/api/glaeml_shellwords.rb', line 36

def reset_state
  @is_escaping                = false
  @is_eating_arg              = false
  @is_eating_arg_between_quotes  = false   
  @args = []
  @current_arg = ""
    
  @escape_mode            = nil
  @unicode_escape_counter = 0
  @unicode_escape_str     = ''
end