1 # This file is part of NIT ( http://www.nitlanguage.org ).
3 # Copyright 2016 Philippe Pépos Petitclerc <ppeposp@gmail.com>
5 # Licensed under the Apache License, Version 2.0 (the "License");
6 # you may not use this file except in compliance with the License.
7 # You may obtain a copy of the License at
9 # http://www.apache.org/licenses/LICENSE-2.0
11 # Unless required by applicable law or agreed to in writing, software
12 # distributed under the License is distributed on an "AS IS" BASIS,
13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 # See the License for the specific language governing permissions and
15 # limitations under the License.
17 # English language utilities for cryptographic purposes.
21 # English letter frequency map
22 var english_freqs
: HashMap[Char, Float] is lazy
do
23 var freqs
= new HashMap[Char, Float]
25 freqs
['a'] = 0.0651738
26 freqs
['b'] = 0.0124248
27 freqs
['c'] = 0.0217339
28 freqs
['d'] = 0.0349835
29 freqs
['e'] = 0.1041442
30 freqs
['f'] = 0.0197881
31 freqs
['g'] = 0.0158610
32 freqs
['h'] = 0.0492888
33 freqs
['i'] = 0.0558094
34 freqs
['j'] = 0.0009033
35 freqs
['k'] = 0.0050529
36 freqs
['l'] = 0.0331490
37 freqs
['m'] = 0.0202124
38 freqs
['n'] = 0.0564513
39 freqs
['o'] = 0.0596302
40 freqs
['p'] = 0.0137645
41 freqs
['q'] = 0.0008606
42 freqs
['r'] = 0.0497563
43 freqs
['s'] = 0.0515760
44 freqs
['t'] = 0.0729357
45 freqs
['u'] = 0.0225134
46 freqs
['v'] = 0.0082903
47 freqs
['w'] = 0.0171272
48 freqs
['x'] = 0.0013692
49 freqs
['y'] = 0.0145984
50 freqs
['z'] = 0.0007836
51 freqs
[' '] = 0.1918182
59 # Score `self` according to english's letter frequency.
60 # This function is useful mainly for cryptography but could happen to be helpful
63 # assert "aaaa".english_scoring > "bbbb".english_scoring
64 fun english_scoring
: Float do
66 var freqs
= english_freqs
71 var points
= freqs
.get_or_null
(c
)
72 if points
!= null then