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December 18, 2015 13:19
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You know how the remote on your DVR makes you select the title of a movie or TV show by moving a cursor up/down/left/right through a grid of letters and then pressing the 'select' key? It takes forever and is very annoying. Imagine you had an app running on your phone that would allow you to type or speak the name, and the app would send the rig…
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| def dvr_remote(s, width): | |
| x = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ_' | |
| rows = [x[i:i+width] for i in range(0, 27, width)] | |
| s = 'A' + s.replace(' ', '_') | |
| DIC = dict((char, (i, pos)) | |
| for i in range(len(rows)) | |
| for (pos, char) in enumerate(rows[i])) | |
| def helper(current, next): | |
| row1, col1 = DIC[current] | |
| row2, col2 = DIC[next] | |
| LR = "" if col1 == col2 else (abs(col1-col2) * 'RL'[col1>col2]) | |
| UD = "" if row1 == row2 else (abs(row1-row2) * 'DU'[row1>row2]) | |
| return LR + UD + '@' | |
| return ''.join(helper(s[i], s[i+1]) for i in range(len(s)-1)) | |
how to code this in haskell?
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dvr_remote('UP', 5) → 'DDDD@U@'
dvr_remote('JAWS', 5) → 'RRRRD@LLLLU@RRDDDD@RU@'
dvr_remote('DAS BOOT', 6) → 'RRR@LLL@DDD@RRD@LUUUU@RDD@@ld@'