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1 | This is a collection of filters to do all sorts of strange things to text. |
2 | B1ff, the Swedish Chef, and an eleet filter are included. |
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3 | |
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4 | Since the original versions of some of these filters have copyright |
5 | problems, I have done a "clean room" re-implementation of the original lex |
6 | filters in perl. I did this without looking at the original code to the |
7 | filters at all, I simply observed their output and drew my own conclusions, |
8 | and wrote my own code. Then I compared the output of the original and new |
9 | filters when ran on large bodies of text, and fixed the things I had |
10 | missed. |
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11 | |
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12 | Here are the results of my investigations of how the filters work: |
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13 | |
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14 | eleet: |
15 | This is the simplest filter to figure out. The letters a-z of |
16 | the alphabet are replaced with the following letters: |
17 | 4 b c d 3 f g h 1 j |< l /\/\ /\/ 0 p q r 5 + u \/ \/\/ >< y z |
18 | Note that the equivalent translation is done on upper-case letters. |
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19 | |
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20 | chef: |
21 | Personally my favorite filter. This took a bit of work to figure |
22 | out, and I doubt I have everything correct. Note that due to a bug |
23 | or an odd feature of the original program, it doesn't seem to think |
24 | that the first letter of the first word is really the first letter |
25 | of a word and so some of the words below don't trigger for that first |
26 | word. I did not emulate this behavior because I think it's probably a |
27 | bug. |
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28 | |
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29 | The word "bork" is never changed, no matter what any of these |
30 | rules may say. Neither is "Bork". |
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31 | |
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32 | The following translations only happen to letters that are the first |
33 | letter of a word of at least 2 letters in size: |
34 | o -> oo |
35 | O -> Oo |
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36 | |
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37 | These happen to letters that are not the last letter of a word: |
38 | a -> e |
39 | A -> e |
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40 | |
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41 | These translations only happen if the letter is not the first letter |
42 | of a word: |
43 | f -> ff |
44 | i -> ee (but only the first `i' per word) |
45 | o -> u |
46 | u -> oo |
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47 | |
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48 | These translations always happen: |
49 | v -> f |
50 | V -> F |
51 | w -> v |
52 | W -> V |
53 | an -> un |
54 | An -> Un |
55 | au -> oo |
56 | Au -> Oo |
57 | |
58 | Any occurrence of "e" at the end of a word is changed to "e-a". |
59 | |
60 | Any occurrence of "e" and the beginning of a word is changed to "i". |
61 | Same with capitals. |
62 | |
63 | Any occurrence of "the" is changed to "zee", any occurrence of |
64 | "The", to "Zee". |
65 | |
66 | Any occurrence of "tion" in a word, to "shun". |
67 | |
68 | Any "th" at the end of a word is changed to "t". |
69 | |
70 | Any "en" at the end of a word is changed to "ee". |
71 | |
72 | Any "ow" at the end of a word is changed to "oo". |
73 | |
74 | And of course, after any `.', `?', or `!' that is at the end of a |
75 | line, the Chef prints out a new line, and then the famous |
76 | "Bork Bork Bork!", and then another newline. |
77 | |
78 | Known bugs in this implementation: |
79 | - says "frunch", not "french". |
80 | - still quite buggy in general. |
81 | |
82 | b1ff: |
83 | Unlike the other filters, b1ff does not try to be an exact duplicate |
84 | of its predecessor. |
85 | |
86 | After upper-casing everything, b1ff does some word and sub-word |
87 | substitutions, most of them misspellings. |
88 | |
89 | B1ff also changes punctuation - All commas become periods; all |
90 | semicolons, commas. Question and exclamation marks are changed to |
91 | things like "!!!!1!" and "?!?!?!". It looks like the original filter |
92 | decided how long a sequence to print based on the text input before |
93 | the end of sentence. I took a simpler route and just randomized it. |
94 | |
95 | Written by Joey Hess <joey@kitenet.net> |