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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import os
from re import compile
from sys import stderr
charmap_regex = compile('[ \t]*charmap[ \t]+"(.*?)",[ \t]*(\$[0-9A-Fa-f]{2}|%[01]{8}|[0-9]{3})')
# A charmap line is
# [ \t]* - zero or more space chars
# charmap - literal charmap
# [ \t]+ - one or more space chars
# "(.*?)" - a lazily-matched text identifier in quotes
# , - literal comma
# [ \t]* - zero or more space chars
# ( - either of
# \$[0-9A-Fa-f]{2} - two hexadecimal digits preceeded by literal $
# %[01]{8} - eight dual digits preceeded by literal %
# [0-9]{3} - three decimal digits
# )
def parse_int(s):
# assumes integers are literal; no +-*/, etc
s = s.strip()
if s.startswith('$'):
return int(s[1:], 16)
if s.startswith('%'):
return int(s[1:], 2)
return int(s)
def read_charmap(charmap_path):
charmap = {}
with open(charmap_path, 'r', encoding='utf-8') as f:
lines = f.readlines()
for line in lines:
m = charmap_regex.match(line)
if m is None:
continue
char = m.group(1)
value = parse_int(m.group(2))
if value in charmap:
print('Value {0:s} already in charmap, dropping it in favor of first charmap entry'.format(m.group(2)))
continue
charmap[value] = char
return charmap
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