1#!/usr/bin/python
2# coding=UTF-8
3#
4# Copyright 2014 Google Inc. All rights reserved.
5#
6# Licensed under the Apache License, Version 2.0 (the "License");
7# you may not use this file except in compliance with the License.
8# You may obtain a copy of the License at
9#
10#     http://www.apache.org/licenses/LICENSE-2.0
11#
12# Unless required by applicable law or agreed to in writing, software
13# distributed under the License is distributed on an "AS IS" BASIS,
14# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15# See the License for the specific language governing permissions and
16# limitations under the License.
17
18"""Subset for web fonts."""
19
20__author__ = 'roozbeh@google.com (Roozbeh Pournader)'
21
22import sys
23
24from nototools import subset
25
26
27def read_charlist(filename):
28    """Returns a list of characters read from a charset text file."""
29    with open(filename) as datafile:
30        charlist = []
31        for line in datafile:
32            if '#' in line:
33                line = line[:line.index('#')]
34            line = line.strip()
35            if not line:
36                continue
37            if line.startswith('U+'):
38                line = line[2:]
39            char = int(line, 16)
40            charlist.append(char)
41        return charlist
42
43
44def main(argv):
45    """Subset the first argument to second, dropping unused parts of the font.
46    """
47    charlist = read_charlist('res/charsets/web.txt')
48    # Add private use characters for legacy reasons
49    charlist += [0xEE01, 0xEE02, 0xF6C3]
50
51    features_to_keep = [
52        'c2sc', 'ccmp', 'cpsp', 'dlig', 'dnom', 'frac', 'kern', 'liga', 'lnum',
53        'locl', 'numr', 'onum', 'pnum', 'smcp', 'ss01', 'ss02', 'ss03', 'ss04',
54        'ss05', 'ss06', 'ss07', 'tnum']
55
56    source_filename = argv[1]
57    target_filename = argv[2]
58    subset.subset_font(
59        source_filename, target_filename,
60        include=charlist,
61        options={'layout_features': features_to_keep})
62
63
64if __name__ == '__main__':
65    main(sys.argv)
66