Convert ascii text from standard input into fixed-width unicode characters.

ascii2fixedwith.rd

#!/usr/bin/env ruby
#
# Convert ascii text from standard input into fixed-width unicode characters.
#
# http://xahlee.info/comp/unicode_full-width_chars.html
fixedWidth = '０１２３４５６７８９ＡＢＣＤＥＦＧＨＩＪＫＬＭＮＯＰＱＲＳＴＵＶＷＸＹＺａｂｃｄｅｆｇｈｉｊｋｌｍｎｏｐｑｒｓｔｕｖｗｘｙｚ，．：；！？＂＇｀＾～￣＿＆＠＃％＋－＊＝＜＞（）［］｛｝｟｠｜￤／＼￢＄￡￠￦￥　'
ascii = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz,.:;!?"\'`^~‾_&@#%+-*=<>()[]{}«»|¦/\\¬$£¢₩¥ '
input = STDIN.read
output = input.split('').map do |c| 
  i = ascii.index(c)
  i.nil? ? c : fixedWidth[i]
end
puts output.join('')

#!/usr/bin/env python3

import sys

fixedWidth = '０１２３４５６７８９ＡＢＣＤＥＦＧＨＩＪＫＬＭＮＯＰＱＲＳＴＵＶＷＸＹＺａｂｃｄｅｆｇｈｉｊｋｌｍｎｏｐｑｒｓｔｕｖｗｘｙｚ，．：；！？＂＇｀＾～￣＿＆＠＃％＋－＊＝＜＞（）［］｛｝｟｠｜￤／＼￢＄￡￠￦￥　\n\r'
ascii = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz,.:;!?"\'`^~‾_&@#%+-*=<>()[]{}«»|¦/\\¬$£¢₩¥ \n\r'
ascii2fixedWidth = dict( zip( ascii, fixedWidth ) )

for line in sys.stdin:
    fixed = ''.join( [ ascii2fixedWidth.get( c, '？' ) for c in line ] )
    print( fixed, file = sys.stdout, end = '' )