diff options
Diffstat (limited to 'jni/ruby/tool/jisx0208.rb')
-rw-r--r-- | jni/ruby/tool/jisx0208.rb | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/jni/ruby/tool/jisx0208.rb b/jni/ruby/tool/jisx0208.rb new file mode 100644 index 0000000..921f574 --- /dev/null +++ b/jni/ruby/tool/jisx0208.rb @@ -0,0 +1,84 @@ +module JISX0208 + class Char + class << self + def from_sjis(sjis) + unless 0x8140 <= sjis && sjis <= 0xFCFC + raise ArgumentError, "out of the range of JIS X 0208: 0x#{sjis.to_s(16)}" + end + sjis_hi, sjis_lo = sjis >> 8, sjis & 0xFF + sjis_hi = (sjis_hi - ((sjis_hi <= 0x9F) ? 0x80 : 0xC0)) << 1 + if sjis_lo <= 0x9E + sjis_hi -= 1 + sjis_lo -= (sjis_lo <= 0x7E) ? 0x3F : 0x40 + else + sjis_lo -= 0x9E + end + return self.new(sjis_hi, sjis_lo) + end + end + + def initialize(row, cell=nil) + if cell + @code = row_cell_to_code(row, cell) + else + @code = row.to_int + end + end + + def ==(other) + if self.class === other + return Integer(self) == Integer(other) + end + return super(other) + end + + def to_int + return @code + end + + def hi + Integer(self) >> 8 + end + + def lo + Integer(self) & 0xFF + end + + def row + self.hi - 0x20 + end + + def cell + self.lo - 0x20 + end + + def succ + succ_hi, succ_lo = self.hi, self.lo + 1 + if succ_lo > 0x7E + succ_lo = 0x21 + succ_hi += 1 + end + return self.class.new(succ_hi << 8 | succ_lo) + end + + def to_sjis + h, l = self.hi, self.lo + h = (h + 1) / 2 + ((0x21..0x5E).include?(h) ? 0x70 : 0xB0) + l += self.hi.odd? ? 0x1F + ((l >= 0x60) ? 1 : 0) : 0x7E + return h << 8 | l + end + + def inspect + "#<JISX0208::Char:#{self.object_id.to_s(16)} sjis=#{self.to_sjis.to_s(16)} jis=#{self.to_int.to_s(16)}>" + end + + private + + def row_cell_to_code(row, cell) + unless 0 < row && (1..94).include?(cell) + raise ArgumentError, "out of row-cell range: #{row}-#{cell}" + end + return (row + 0x20) << 8 | (cell + 0x20) + end + end +end |