Class: TestBench::Session::Output::Writer::Buffer::Interactive::Viewport

Inherits:
Struct
  • Object
show all
Defined in:
lib/test_bench/session/output/writer/buffer/interactive/viewport.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#column ⇒ Object

Returns the value of attribute column

Returns:

  • (Object) —

    the current value of column



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# File 'lib/test_bench/session/output/writer/buffer/interactive/viewport.rb', line 7

def column
  @column
end

#height ⇒ Object

Returns the value of attribute height

Returns:

  • (Object) —

    the current value of height



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# File 'lib/test_bench/session/output/writer/buffer/interactive/viewport.rb', line 7

def height
  @height
end

#row ⇒ Object

Returns the value of attribute row

Returns:

  • (Object) —

    the current value of row



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# File 'lib/test_bench/session/output/writer/buffer/interactive/viewport.rb', line 7

def row
  @row
end

#rows_scrolled ⇒ Object

Returns the value of attribute rows_scrolled

Returns:

  • (Object) —

    the current value of rows_scrolled



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# File 'lib/test_bench/session/output/writer/buffer/interactive/viewport.rb', line 7

def rows_scrolled
  @rows_scrolled
end

#scroll_rows ⇒ Object

Returns the value of attribute scroll_rows

Returns:

  • (Object) —

    the current value of scroll_rows



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# File 'lib/test_bench/session/output/writer/buffer/interactive/viewport.rb', line 7

def scroll_rows
  @scroll_rows
end

#width ⇒ Object

Returns the value of attribute width

Returns:

  • (Object) —

    the current value of width



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# File 'lib/test_bench/session/output/writer/buffer/interactive/viewport.rb', line 7

def width
  @width
end

Class Method Details

.build(width, height, row, column, scroll_rows = nil) ⇒ Object 



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# File 'lib/test_bench/session/output/writer/buffer/interactive/viewport.rb', line 8

def self.build(width, height, row, column, scroll_rows=nil)
  scroll_rows ||= 0

  rows_scrolled = 0

  new(width, height, row, column, scroll_rows, rows_scrolled)
end

.escape_sequence_pattern ⇒ Object 



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# File 'lib/test_bench/session/output/writer/buffer/interactive/viewport.rb', line 152

def self.escape_sequence_pattern
  initiator = %r{\e\[}
  terminator = %r{[[:alpha:]]}
  sequence = %r{[[:digit:]]+(?:;[[:digit:]]+)*}

  %r{#{initiator}#{sequence}?#{terminator}}
end

.get ⇒ Object 



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# File 'lib/test_bench/session/output/writer/buffer/interactive/viewport.rb', line 20

def self.get
  width, height, row, column = nil

  Kernel.require 'io/console'
  STDIN.raw do |stdin|
    height, width = stdin.winsize

    row, column = stdin.cursor
  end

  scroll_rows = row

  build(width, height, row, column, scroll_rows)
end

.null ⇒ Object 



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# File 'lib/test_bench/session/output/writer/buffer/interactive/viewport.rb', line 16

def self.null
  build(0, 0, 0, 0)
end

Instance Method Details

#bottom_row? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/test_bench/session/output/writer/buffer/interactive/viewport.rb', line 148

def bottom_row?
  row == height - 1
end

#capacity ⇒ Object 



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# File 'lib/test_bench/session/output/writer/buffer/interactive/viewport.rb', line 129

def capacity
  capacity = 0

  rows_remaining = height + scroll_rows_remaining - row - 1

  if rows_remaining > 0
    capacity += (rows_remaining - 1) * width

    final_row = width - column
    capacity += final_row
  end

  capacity
end

#capacity? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/test_bench/session/output/writer/buffer/interactive/viewport.rb', line 121

def capacity?
  if scroll_rows_remaining > 0
    true
  else
    not bottom_row?
  end
end

#scroll_rows_remaining ⇒ Object 



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# File 'lib/test_bench/session/output/writer/buffer/interactive/viewport.rb', line 144

def scroll_rows_remaining
  scroll_rows - rows_scrolled
end

#write(text) ⇒ Object 



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# File 'lib/test_bench/session/output/writer/buffer/interactive/viewport.rb', line 35

def write(text)
  bytes_written = 0

  escape_sequence_pattern = self.class.escape_sequence_pattern

  until text.empty?
    write_text, escape_sequence, text = text.partition(escape_sequence_pattern)

    bytes_written += write!(write_text)
    bytes_written += escape_sequence.bytesize
  end

  bytes_written
end

#write!(text) ⇒ Object 



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# File 'lib/test_bench/session/output/writer/buffer/interactive/viewport.rb', line 50

def write!(text)
  newline = text.end_with?("\n")

  if newline
    text = text[0...-1]
  end

  bytes_written = write_text(text)

  if newline
    bytes_written += write_newline
  end

  bytes_written
end

#write_newline ⇒ Object 



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# File 'lib/test_bench/session/output/writer/buffer/interactive/viewport.rb', line 105

def write_newline
  if bottom_row?
    if scroll_rows_remaining.zero?
      return 0
    end

    self.rows_scrolled += 1
  else
    self.row += 1
  end

  self.column = 0

  1
end

#write_text(text) ⇒ Object 



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# File 'lib/test_bench/session/output/writer/buffer/interactive/viewport.rb', line 66

def write_text(text)
  if text.start_with?("\e")
    return text.bytesize
  end

  written_text = text[0...capacity]

  bytes_written = written_text.bytesize

  row = self.row
  column = self.column

  text_rows, text_columns = bytes_written.divmod(width)

  row += text_rows

  columns_remaining = width - column
  if columns_remaining > text_columns
    column += text_columns
  else
    row += 1
    column = text_columns - columns_remaining
  end

  if row >= height
    final_row = height - 1

    scroll_rows = row - final_row
    self.rows_scrolled += scroll_rows

    row = final_row
  end

  self.row = row
  self.column = column

  bytes_written
end