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