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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
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