Class: IRB::Driver::TTY

Inherits:

Object

• Object
• IRB::Driver::TTY

show all

Defined in:

lib/irb/driver/tty.rb

Constant Summary

CLEAR_LAST_LINE =

move_one_line_up + move_to_begin_of_line + clear_to_end_of_line

Instance Attribute Summary (collapse)

• - (Object) context_stack readonly

  Returns the value of attribute context_stack.

• - (Object) input readonly

  Returns the value of attribute input.

• - (Object) output readonly

  Returns the value of attribute output.

Instance Method Summary (collapse)

• - (Object) consume

  TODO make it take the current context instead of storing it.

• - (Object) context
• - (TTY) initialize(input = $stdin, output = $stdout) constructor

  A new instance of TTY.

• - (Object) process_input(line)
• - (Object) readline
• - (Object) run(context)

  Feeds input into a given context.

• - (Object) update_last_line(prompt, reformatted_line)

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# File 'lib/irb/driver/tty.rb', line 13

def initialize(input = $stdin, output = $stdout)
  @input  = input
  @output = output
  @context_stack = []
end

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# File 'lib/irb/driver/tty.rb', line 11

def context_stack
  @context_stack
end

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# File 'lib/irb/driver/tty.rb', line 11

def input
  @input
end

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# File 'lib/irb/driver/tty.rb', line 11

def output
  @output
end

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# File 'lib/irb/driver/tty.rb', line 29

def consume
  readline
rescue Interrupt
  context.clear_buffer
  ""
end

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# File 'lib/irb/driver/tty.rb', line 19

def context
  @context_stack.last
end

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# File 'lib/irb/driver/tty.rb', line 41

def process_input(line)
  context.process_line(line) do |prompt, updated_line|
    update_last_line(prompt, updated_line)
  end
end

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# File 'lib/irb/driver/tty.rb', line 23

def readline
  @output.print(context.prompt)
  @input.gets
end

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# File 'lib/irb/driver/tty.rb', line 51

def run(context)
  @context_stack << context
  while line = consume
    continue = process_input(line)
    break unless continue
  end
ensure
  @context_stack.pop
end

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# File 'lib/irb/driver/tty.rb', line 36

def update_last_line(prompt, reformatted_line)
  @output.print CLEAR_LAST_LINE
  @output.puts("#{prompt}#{reformatted_line}")
end