text: package yaml
  
  const (
  	// The size of the input raw buffer.
  	input_raw_buffer_size = 512
  
  	// The size of the input buffer.
  	// It should be possible to decode the whole raw buffer.
  	input_buffer_size = input_raw_buffer_size * 3
  
  	// The size of the output buffer.
  	output_buffer_size = 128
  
  	// The size of the output raw buffer.
  	// It should be possible to encode the whole output buffer.
  	output_raw_buffer_size = (output_buffer_size*2 + 2)
  
  	// The size of other stacks and queues.
  	initial_stack_size  = 16
  	initial_queue_size  = 16
  	initial_string_size = 16
  )
  
  // Check if the character at the specified position is an alphabetical
  // character, a digit, '_', or '-'.
  func is_alpha(b []byte, i int) bool {
  	return b[i] >= '0' && b[i] <= '9' || b[i] >= 'A' && b[i] <= 'Z' || b[i] >= 'a' && b[i] <= 'z' || b[i] == '_' || b[i] == '-'
  }
  
  // Check if the character at the specified position is a digit.
  func is_digit(b []byte, i int) bool {
  	return b[i] >= '0' && b[i] <= '9'
  }
  
  // Get the value of a digit.
  func as_digit(b []byte, i int) int {
  	return int(b[i]) - '0'
  }
  
  // Check if the character at the specified position is a hex-digit.
  func is_hex(b []byte, i int) bool {
  	return b[i] >= '0' && b[i] <= '9' || b[i] >= 'A' && b[i] <= 'F' || b[i] >= 'a' && b[i] <= 'f'
  }
  
  // Get the value of a hex-digit.
  func as_hex(b []byte, i int) int {
  	bi := b[i]
  	if bi >= 'A' && bi <= 'F' {
  		return int(bi) - 'A' + 10
  	}
  	if bi >= 'a' && bi <= 'f' {
  		return int(bi) - 'a' + 10
  	}
  	return int(bi) - '0'
  }
  
  // Check if the character is ASCII.
  func is_ascii(b []byte, i int) bool {
  	return b[i] <= 0x7F
  }
  
  // Check if the character at the start of the buffer can be printed unescaped.
  func is_printable(b []byte, i int) bool {
  	return ((b[i] == 0x0A) || // . == #x0A
  		(b[i] >= 0x20 && b[i] <= 0x7E) || // #x20 <= . <= #x7E
  		(b[i] == 0xC2 && b[i+1] >= 0xA0) || // #0xA0 <= . <= #xD7FF
  		(b[i] > 0xC2 && b[i] < 0xED) ||
  		(b[i] == 0xED && b[i+1] < 0xA0) ||
  		(b[i] == 0xEE) ||
  		(b[i] == 0xEF && // #xE000 <= . <= #xFFFD
  			!(b[i+1] == 0xBB && b[i+2] == 0xBF) && // && . != #xFEFF
  			!(b[i+1] == 0xBF && (b[i+2] == 0xBE || b[i+2] == 0xBF))))
  }
  
  // Check if the character at the specified position is NUL.
  func is_z(b []byte, i int) bool {
  	return b[i] == 0x00
  }
  
  // Check if the beginning of the buffer is a BOM.
  func is_bom(b []byte, i int) bool {
  	return b[0] == 0xEF && b[1] == 0xBB && b[2] == 0xBF
  }
  
  // Check if the character at the specified position is space.
  func is_space(b []byte, i int) bool {
  	return b[i] == ' '
  }
  
  // Check if the character at the specified position is tab.
  func is_tab(b []byte, i int) bool {
  	return b[i] == '\t'
  }
  
  // Check if the character at the specified position is blank (space or tab).
  func is_blank(b []byte, i int) bool {
  	//return is_space(b, i) || is_tab(b, i)
  	return b[i] == ' ' || b[i] == '\t'
  }
  
  // Check if the character at the specified position is a line break.
  func is_break(b []byte, i int) bool {
  	return (b[i] == '\r' || // CR (#xD)
  		b[i] == '\n' || // LF (#xA)
  		b[i] == 0xC2 && b[i+1] == 0x85 || // NEL (#x85)
  		b[i] == 0xE2 && b[i+1] == 0x80 && b[i+2] == 0xA8 || // LS (#x2028)
  		b[i] == 0xE2 && b[i+1] == 0x80 && b[i+2] == 0xA9) // PS (#x2029)
  }
  
  func is_crlf(b []byte, i int) bool {
  	return b[i] == '\r' && b[i+1] == '\n'
  }
  
  // Check if the character is a line break or NUL.
  func is_breakz(b []byte, i int) bool {
  	//return is_break(b, i) || is_z(b, i)
  	return (        // is_break:
  	b[i] == '\r' || // CR (#xD)
  		b[i] == '\n' || // LF (#xA)
  		b[i] == 0xC2 && b[i+1] == 0x85 || // NEL (#x85)
  		b[i] == 0xE2 && b[i+1] == 0x80 && b[i+2] == 0xA8 || // LS (#x2028)
  		b[i] == 0xE2 && b[i+1] == 0x80 && b[i+2] == 0xA9 || // PS (#x2029)
  		// is_z:
  		b[i] == 0)
  }
  
  // Check if the character is a line break, space, or NUL.
  func is_spacez(b []byte, i int) bool {
  	//return is_space(b, i) || is_breakz(b, i)
  	return ( // is_space:
  	b[i] == ' ' ||
  		// is_breakz:
  		b[i] == '\r' || // CR (#xD)
  		b[i] == '\n' || // LF (#xA)
  		b[i] == 0xC2 && b[i+1] == 0x85 || // NEL (#x85)
  		b[i] == 0xE2 && b[i+1] == 0x80 && b[i+2] == 0xA8 || // LS (#x2028)
  		b[i] == 0xE2 && b[i+1] == 0x80 && b[i+2] == 0xA9 || // PS (#x2029)
  		b[i] == 0)
  }
  
  // Check if the character is a line break, space, tab, or NUL.
  func is_blankz(b []byte, i int) bool {
  	//return is_blank(b, i) || is_breakz(b, i)
  	return ( // is_blank:
  	b[i] == ' ' || b[i] == '\t' ||
  		// is_breakz:
  		b[i] == '\r' || // CR (#xD)
  		b[i] == '\n' || // LF (#xA)
  		b[i] == 0xC2 && b[i+1] == 0x85 || // NEL (#x85)
  		b[i] == 0xE2 && b[i+1] == 0x80 && b[i+2] == 0xA8 || // LS (#x2028)
  		b[i] == 0xE2 && b[i+1] == 0x80 && b[i+2] == 0xA9 || // PS (#x2029)
  		b[i] == 0)
  }
  
  // Determine the width of the character.
  func width(b byte) int {
  	// Don't replace these by a switch without first
  	// confirming that it is being inlined.
  	if b&0x80 == 0x00 {
  		return 1
  	}
  	if b&0xE0 == 0xC0 {
  		return 2
  	}
  	if b&0xF0 == 0xE0 {
  		return 3
  	}
  	if b&0xF8 == 0xF0 {
  		return 4
  	}
  	return 0
  
  }
  