Class: Command::TextInterpreter

Inherits:
BaseInterpreter show all
Defined in:
lib/command-set/interpreter/text.rb

Instance Attribute Summary collapse

Attributes inherited from BaseInterpreter

#command_set, #logger, #out_io, #subject

Instance Method Summary collapse

Methods inherited from BaseInterpreter

#behavior, #fill_subject, #get_subject, #next_command, #pop_mode, #prep_subject, #process_input, #push_mode, #subject_requirements

Constructor Details

#initialize ⇒ TextInterpreter

Returns a new instance of TextInterpreter.



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# File 'lib/command-set/interpreter/text.rb', line 66

def initialize
  super
  @complete_line = false
  @behavior.merge!(
    :prompt => [/(?:: )?$/, "> "]
  )
end

Instance Attribute Details

#complete_line ⇒ Object

Returns the value of attribute complete_line.



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# File 'lib/command-set/interpreter/text.rb', line 74

def complete_line
  @complete_line
end

Instance Method Details

#complete(word, line) ⇒ Object 



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# File 'lib/command-set/interpreter/text.rb', line 141

def complete(word, line)
  list = current_command_set.completion_list(line, word, build_subject)

  if list.length == 0
    raise CommandException, "Unrecognized term: #{word}"
  end

  return word if list[-1].empty?

  if list.length == 1
    return list[0]
  else
    raise CommandException, "Ambiguous term: #{word}"
  end
end

#cook_input(line) ⇒ Object 



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# File 'lib/command-set/interpreter/text.rb', line 124

def cook_input(line)
  line = split_line(line)
  if(@complete_line)
    new_line = []
    line.each do |word|
      word = complete(word, new_line.dup)
      new_line << word
    end
    line = new_line
  end
  line.pop if line.last.empty?
  return self.current_command_set.process_terms(line, self.subject)
end

#get_formatter ⇒ Object 



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# File 'lib/command-set/interpreter/text.rb', line 207

def get_formatter
  return Results::StrategyFormatter.new(::Command::raw_stdout)
end

#get_prompt ⇒ Object 



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# File 'lib/command-set/interpreter/text.rb', line 211

def get_prompt
  prompt = ""

  prompt.sub!(*(@command_set.prompt))
  @sub_modes.each do |mode|
    prompt.sub!(*(mode[0].prompt))
  end
  prompt.sub!(*(@behavior[:prompt]))
end

#go ⇒ Object 



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# File 'lib/command-set/interpreter/text.rb', line 76

def go
  if @command_set.nil? or @subject.nil?
    raise "command_set or subject unset!"
  end

  @stop = false

  begin
    old_proc = set_readline_completion do |prefix|
      readline_complete(Readline.line_buffer, prefix)
    end

    line = readline(get_prompt, true)
    if line.nil?
      puts
      break
    end
    next if line.empty?
    process_line(line)
  rescue Interrupt
    @out_io.puts "Interrupt: please use \"quit\""
  rescue CommandException => ce
    output_exception("Error", ce)
  rescue Exception => e
    self.pause_before_dying(e)
  ensure
    unless old_proc.nil?
      set_readline_completion(&old_proc)
    end
  end until @stop
end

#output_exception(label, ex) ⇒ Object 



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# File 'lib/command-set/interpreter/text.rb', line 108

def output_exception(label, ex)
  @out_io.puts label + ": " + ex.message
  @out_io.puts ex.backtrace.join("\n") if @behavior[:debug_commands]
  logger.warn ex.message
  ex.backtrace.each do |line|
    logger.debug line
  end
end

#pause_before_dying(exception) ⇒ Object 



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# File 'lib/command-set/interpreter/text.rb', line 117

def pause_before_dying(exception)
  output_exception("Exception", exception)
  puts "Waiting for return"
  $stdin.gets
  stop
end

#prompt_user(message) ⇒ Object 



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# File 'lib/command-set/interpreter/text.rb', line 225

def prompt_user(message)
  readline(message)
end

#readline_complete(buffer, rl_prefix) ⇒ Object 



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# File 'lib/command-set/interpreter/text.rb', line 157

def readline_complete(buffer, rl_prefix)
  begin
    parsed_input = split_line(buffer)
    prefix = parsed_input.pop

    #Lest this kill coverage: hide exists to fix readline's irritating
    #word splitting
    hide = prefix.sub(%r{#{rl_prefix}$}, "")
      
    if /"#{prefix}$/ =~ buffer
      hide = '"' + hide
    end

    completes = current_command_set.completion_list(parsed_input, 
                                                    prefix, build_subject)
    completes.map! do |complete|
      if split_line(complete).length > 1
        ('"' + complete + '"').sub(/^#{hide}/, "")
      else
        complete.sub(/^#{hide}/, "")
      end
    end

    return completes
  rescue Object => ex
    #It's really irritating for an app to crap out in completion
    return ["#{ex.class}: #{ex.message}", ""]
  end
end

#split_line(line) ⇒ Object 



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# File 'lib/command-set/interpreter/text.rb', line 187

def split_line(line)
  line_array = [""]
  scanner = StringScanner.new(line)
  scanner.scan(/\s*/)

  until scanner.eos?
    next_break = scanner.scan(/['"]/) || '\s'
    line_array.last << scanner.scan(/[^#{next_break}\\]*/)
    stopped_by = scanner.scan(/[#{next_break}\\]/)
    if stopped_by == '\\'
      line_array.last << scanner.getch
    elsif not (stopped_by.nil? or stopped_by =~ /['"]/)
      scanner.scan(/\s*/)
      line_array << ""
    end
  end

  return line_array
end

#stop ⇒ Object 



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# File 'lib/command-set/interpreter/text.rb', line 221

def stop
  @stop = true
end