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Commit | Line | Data |
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cd3ff89e | 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. | |
7e3afbba | 3 | |
cd3ff89e | 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. | |
7e3afbba | 10 | |
cd3ff89e | 11 | Here are the results of my investigations of how the filters work: |
7e3afbba | 12 | |
cd3ff89e | 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. | |
7e3afbba | 18 | |
cd3ff89e | 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. | |
7e3afbba | 27 | |
cd3ff89e | 28 | The word "bork" is never changed, no matter what any of these |
29 | rules may say. Neither is "Bork". | |
7e3afbba | 30 | |
cd3ff89e | 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 | |
7e3afbba | 35 | |
cd3ff89e | 36 | These happen to letters that are not the last letter of a word: |
37 | a -> e | |
38 | A -> e | |
7e3afbba | 39 | |
cd3ff89e | 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 | |
7e3afbba | 46 | |
cd3ff89e | 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> |