Class: Denebola::LazyRope

Inherits:
Object
  • Object
show all
Defined in:
lib/canopus/denebola_compat.rb

Instance Method Summary collapse

Instance Method Details

#line_end(row) ⇒ Object 



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# File 'lib/canopus/denebola_compat.rb', line 7

def line_end(row)
  start = line_start(row)
  ending = row + 1 < line_count(exact: true) ? line_start(row + 1) : bytesize
  tail_start = [ending - 3, start].max
  tail = send(:read_bytes, tail_start, [ending - tail_start, 3].min)
  ending - (tail.end_with?("\r\n") ? 2 : tail.end_with?("\r", "\n") ? 1 : 0)
end

#line_window(row, from: 0, max_bytes: 16_384) ⇒ Object 



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# File 'lib/canopus/denebola_compat.rb', line 15

def line_window(row, from: 0, max_bytes: 16_384)
  start, ending = line_start(row), line_end(row)
  offset = (start + from).clamp(start, ending)
  offset -= 1 while offset > start && offset < ending && (send(:read_bytes, offset, 1).getbyte(0) & 0xc0) == 0x80
  value = send(:read_bytes, offset, [max_bytes, ending - offset].min)
  finish = value.bytesize
  while finish.positive? && !value.byteslice(0, finish).force_encoding(Encoding::UTF_8).valid_encoding?
    finish -= 1
  end
  [value.byteslice(0, finish).to_s.force_encoding(Encoding::UTF_8), offset - start]
end