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ruby--ruby/lib/reline/unicode.rb
aycabta 17350c7e55 Add Reline as a fallback library for Readline 
* lib/reine.rb, lib/reline/*: Reline is a readline stdlib compatible
  library.
* lib/readline.rb: Readline uses a fallback to Reline when ext/readline
  doesn't exist.
* tool/sync_default_gems.rb: add ruby/reline as a default gem.
* appveyor.yml: add "set RELINE_TEST_ENCODING=Windows-31J" for test suit
  of Reline, and add "--exclude readline" to "nmake test-all" on Visual
  Studio builds because of strange behavior.
* spec/ruby/library/readline/spec_helper.rb: skip Reline as with
  RbReadline.
2019-04-30 11:44:20 +09:00

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class Reline::Unicode
EscapedPairs = {
0x00 => '^@',
0x01 => '^A', # C-a
0x02 => '^B',
0x03 => '^C',
0x04 => '^D',
0x05 => '^E',
0x06 => '^F',
0x07 => '^G',
0x08 => '^H', # Backspace
0x09 => '^I',
0x0A => '^J',
0x0B => '^K',
0x0C => '^L',
0x0D => '^M', # Enter
0x0E => '^N',
0x0F => '^O',
0x10 => '^P',
0x11 => '^Q',
0x12 => '^R',
0x13 => '^S',
0x14 => '^T',
0x15 => '^U',
0x16 => '^V',
0x17 => '^W',
0x18 => '^X',
0x19 => '^Y',
0x1A => '^Z', # C-z
0x1B => '^[', # C-[ C-3
0x1D => '^]', # C-]
0x1E => '^^', # C-~ C-6
0x1F => '^_', # C-_ C-7
0x7F => '^?', # C-? C-8
}
EscapedChars = EscapedPairs.keys.map(&:chr)
def self.get_mbchar_byte_size_by_first_char(c)
# Checks UTF-8 character byte size
case c.ord
# 0b0xxxxxxx
when ->(code) { (code ^ 0b10000000).allbits?(0b10000000) } then 1
# 0b110xxxxx
when ->(code) { (code ^ 0b00100000).allbits?(0b11100000) } then 2
# 0b1110xxxx
when ->(code) { (code ^ 0b00010000).allbits?(0b11110000) } then 3
# 0b11110xxx
when ->(code) { (code ^ 0b00001000).allbits?(0b11111000) } then 4
# 0b111110xx
when ->(code) { (code ^ 0b00000100).allbits?(0b11111100) } then 5
# 0b1111110x
when ->(code) { (code ^ 0b00000010).allbits?(0b11111110) } then 6
# successor of mbchar
else 0
end
end
def self.get_mbchar_width(mbchar)
case mbchar.encode(Encoding::UTF_8)
when *EscapedChars # ^ + char, such as ^M, ^H, ^[, ...
2
when /^\u{2E3B}/ # THREE-EM DASH
3
when /^\p{M}/
0
when EastAsianWidth::TYPE_A
Reline.ambiguous_width
when EastAsianWidth::TYPE_F, EastAsianWidth::TYPE_W
2
when EastAsianWidth::TYPE_H, EastAsianWidth::TYPE_NA, EastAsianWidth::TYPE_N
1
else
nil
end
end
def self.get_next_mbchar_size(line, byte_pointer)
grapheme = line.byteslice(byte_pointer..-1).grapheme_clusters.first
grapheme ? grapheme.bytesize : 0
end
def self.get_prev_mbchar_size(line, byte_pointer)
if byte_pointer.zero?
0
else
grapheme = line.byteslice(0..(byte_pointer - 1)).grapheme_clusters.last
grapheme ? grapheme.bytesize : 0
end
end
def self.em_forward_word(line, byte_pointer)
width = 0
byte_size = 0
while line.bytesize > (byte_pointer + byte_size)
size = get_next_mbchar_size(line, byte_pointer + byte_size)
mbchar = line.byteslice(byte_pointer + byte_size, size)
break if mbchar.encode(Encoding::UTF_8) =~ /\p{Word}/
width += get_mbchar_width(mbchar)
byte_size += size
end
while line.bytesize > (byte_pointer + byte_size)
size = get_next_mbchar_size(line, byte_pointer + byte_size)
mbchar = line.byteslice(byte_pointer + byte_size, size)
break if mbchar.encode(Encoding::UTF_8) =~ /\P{Word}/
width += get_mbchar_width(mbchar)
byte_size += size
end
[byte_size, width]
end
def self.em_forward_word_with_capitalization(line, byte_pointer)
width = 0
byte_size = 0
new_str = String.new
while line.bytesize > (byte_pointer + byte_size)
size = get_next_mbchar_size(line, byte_pointer + byte_size)
mbchar = line.byteslice(byte_pointer + byte_size, size)
break if mbchar.encode(Encoding::UTF_8) =~ /\p{Word}/
new_str += mbchar
width += get_mbchar_width(mbchar)
byte_size += size
end
first = true
while line.bytesize > (byte_pointer + byte_size)
size = get_next_mbchar_size(line, byte_pointer + byte_size)
mbchar = line.byteslice(byte_pointer + byte_size, size)
break if mbchar.encode(Encoding::UTF_8) =~ /\P{Word}/
if first
new_str += mbchar.upcase
first = false
else
new_str += mbchar.downcase
end
width += get_mbchar_width(mbchar)
byte_size += size
end
[byte_size, width, new_str]
end
def self.em_backward_word(line, byte_pointer)
width = 0
byte_size = 0
while 0 < (byte_pointer - byte_size)
size = get_prev_mbchar_size(line, byte_pointer - byte_size)
mbchar = line.byteslice(byte_pointer - byte_size - size, size)
break if mbchar.encode(Encoding::UTF_8) =~ /\p{Word}/
width += get_mbchar_width(mbchar)
byte_size += size
end
while 0 < (byte_pointer - byte_size)
size = get_prev_mbchar_size(line, byte_pointer - byte_size)
mbchar = line.byteslice(byte_pointer - byte_size - size, size)
break if mbchar.encode(Encoding::UTF_8) =~ /\P{Word}/
width += get_mbchar_width(mbchar)
byte_size += size
end
[byte_size, width]
end
def self.em_big_backward_word(line, byte_pointer)
width = 0
byte_size = 0
while 0 < (byte_pointer - byte_size)
size = get_prev_mbchar_size(line, byte_pointer - byte_size)
mbchar = line.byteslice(byte_pointer - byte_size - size, size)
break if mbchar =~ /\S/
width += get_mbchar_width(mbchar)
byte_size += size
end
while 0 < (byte_pointer - byte_size)
size = get_prev_mbchar_size(line, byte_pointer - byte_size)
mbchar = line.byteslice(byte_pointer - byte_size - size, size)
break if mbchar =~ /\s/
width += get_mbchar_width(mbchar)
byte_size += size
end
[byte_size, width]
end
def self.vi_big_forward_word(line, byte_pointer)
width = 0
byte_size = 0
while (line.bytesize - 1) > (byte_pointer + byte_size)
size = get_next_mbchar_size(line, byte_pointer + byte_size)
mbchar = line.byteslice(byte_pointer + byte_size, size)
break if mbchar =~ /\s/
width += get_mbchar_width(mbchar)
byte_size += size
end
while (line.bytesize - 1) > (byte_pointer + byte_size)
size = get_next_mbchar_size(line, byte_pointer + byte_size)
mbchar = line.byteslice(byte_pointer + byte_size, size)
break if mbchar =~ /\S/
width += get_mbchar_width(mbchar)
byte_size += size
end
[byte_size, width]
end
def self.vi_big_forward_end_word(line, byte_pointer)
if (line.bytesize - 1) > byte_pointer
size = get_next_mbchar_size(line, byte_pointer)
mbchar = line.byteslice(byte_pointer, size)
width = get_mbchar_width(mbchar)
byte_size = size
else
return [0, 0]
end
while (line.bytesize - 1) > (byte_pointer + byte_size)
size = get_next_mbchar_size(line, byte_pointer + byte_size)
mbchar = line.byteslice(byte_pointer + byte_size, size)
break if mbchar =~ /\S/
width += get_mbchar_width(mbchar)
byte_size += size
end
prev_width = width
prev_byte_size = byte_size
while line.bytesize > (byte_pointer + byte_size)
size = get_next_mbchar_size(line, byte_pointer + byte_size)
mbchar = line.byteslice(byte_pointer + byte_size, size)
break if mbchar =~ /\s/
prev_width = width
prev_byte_size = byte_size
width += get_mbchar_width(mbchar)
byte_size += size
end
[prev_byte_size, prev_width]
end
def self.vi_big_backward_word(line, byte_pointer)
width = 0
byte_size = 0
while 0 < (byte_pointer - byte_size)
size = get_prev_mbchar_size(line, byte_pointer - byte_size)
mbchar = line.byteslice(byte_pointer - byte_size - size, size)
break if mbchar =~ /\S/
width += get_mbchar_width(mbchar)
byte_size += size
end
while 0 < (byte_pointer - byte_size)
size = get_prev_mbchar_size(line, byte_pointer - byte_size)
mbchar = line.byteslice(byte_pointer - byte_size - size, size)
break if mbchar =~ /\s/
width += get_mbchar_width(mbchar)
byte_size += size
end
[byte_size, width]
end
def self.vi_forward_word(line, byte_pointer)
if (line.bytesize - 1) > byte_pointer
size = get_next_mbchar_size(line, byte_pointer)
mbchar = line.byteslice(byte_pointer, size)
if mbchar =~ /\w/
started_by = :word
elsif mbchar =~ /\s/
started_by = :space
else
started_by = :non_word_printable
end
width = get_mbchar_width(mbchar)
byte_size = size
else
return [0, 0]
end
while (line.bytesize - 1) > (byte_pointer + byte_size)
size = get_next_mbchar_size(line, byte_pointer + byte_size)
mbchar = line.byteslice(byte_pointer + byte_size, size)
case started_by
when :word
break if mbchar =~ /\W/
when :space
break if mbchar =~ /\S/
when :non_word_printable
break if mbchar =~ /\w|\s/
end
width += get_mbchar_width(mbchar)
byte_size += size
end
while (line.bytesize - 1) > (byte_pointer + byte_size)
size = get_next_mbchar_size(line, byte_pointer + byte_size)
mbchar = line.byteslice(byte_pointer + byte_size, size)
break if mbchar =~ /\S/
width += get_mbchar_width(mbchar)
byte_size += size
end
[byte_size, width]
end
def self.vi_forward_end_word(line, byte_pointer)
if (line.bytesize - 1) > byte_pointer
size = get_next_mbchar_size(line, byte_pointer)
mbchar = line.byteslice(byte_pointer, size)
if mbchar =~ /\w/
started_by = :word
elsif mbchar =~ /\s/
started_by = :space
else
started_by = :non_word_printable
end
width = get_mbchar_width(mbchar)
byte_size = size
else
return [0, 0]
end
if (line.bytesize - 1) > (byte_pointer + byte_size)
size = get_next_mbchar_size(line, byte_pointer + byte_size)
mbchar = line.byteslice(byte_pointer + byte_size, size)
if mbchar =~ /\w/
second = :word
elsif mbchar =~ /\s/
second = :space
else
second = :non_word_printable
end
second_width = get_mbchar_width(mbchar)
second_byte_size = size
else
return [byte_size, width]
end
if second == :space
width += second_width
byte_size += second_byte_size
while (line.bytesize - 1) > (byte_pointer + byte_size)
size = get_next_mbchar_size(line, byte_pointer + byte_size)
mbchar = line.byteslice(byte_pointer + byte_size, size)
if mbchar =~ /\S/
if mbchar =~ /\w/
started_by = :word
else
started_by = :non_word_printable
end
break
end
width += get_mbchar_width(mbchar)
byte_size += size
end
else
case [started_by, second]
when [:word, :non_word_printable], [:non_word_printable, :word]
started_by = second
else
width += second_width
byte_size += second_byte_size
started_by = second
end
end
prev_width = width
prev_byte_size = byte_size
while line.bytesize > (byte_pointer + byte_size)
size = get_next_mbchar_size(line, byte_pointer + byte_size)
mbchar = line.byteslice(byte_pointer + byte_size, size)
case started_by
when :word
break if mbchar =~ /\W/
when :non_word_printable
break if mbchar =~ /[\w\s]/
end
prev_width = width
prev_byte_size = byte_size
width += get_mbchar_width(mbchar)
byte_size += size
end
[prev_byte_size, prev_width]
end
def self.vi_backward_word(line, byte_pointer)
width = 0
byte_size = 0
while 0 < (byte_pointer - byte_size)
size = get_prev_mbchar_size(line, byte_pointer - byte_size)
mbchar = line.byteslice(byte_pointer - byte_size - size, size)
if mbchar =~ /\S/
if mbchar =~ /\w/
started_by = :word
else
started_by = :non_word_printable
end
break
end
width += get_mbchar_width(mbchar)
byte_size += size
end
while 0 < (byte_pointer - byte_size)
size = get_prev_mbchar_size(line, byte_pointer - byte_size)
mbchar = line.byteslice(byte_pointer - byte_size - size, size)
case started_by
when :word
break if mbchar =~ /\W/
when :non_word_printable
break if mbchar =~ /[\w\s]/
end
width += get_mbchar_width(mbchar)
byte_size += size
end
[byte_size, width]
end
def self.ed_move_to_begin(line)
width = 0
byte_size = 0
while (line.bytesize - 1) > byte_size
size = get_next_mbchar_size(line, byte_size)
mbchar = line.byteslice(byte_size, size)
if mbchar =~ /\S/
break
end
width += get_mbchar_width(mbchar)
byte_size += size
end
[byte_size, width]
end
end
require 'reline/unicode/east_asian_width'
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