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42194094a2
lib/linguist/languages.yml:
Add the declaration for the language.
samples/Mercury:
Add samples for the classifier as Mercury shares it's filename extension
with several other languages.
117 lines
2.3 KiB
Mathematica
117 lines
2.3 KiB
Mathematica
% File: rot13_verbose.m
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% Main author: Warwick Harvey <wharvey@cs.monash.edu.au>
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% Additional input: Fergus Henderson <fjh@cs.mu.oz.au>
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%
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% rot13_verbose:
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%
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% Program to read its input, apply the rot13 algorithm, and write it out
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% again.
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%
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% This version is more verbose (and more efficient) than its companion,
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% rot13_concise.
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%
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% Key features:
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% - is independent of character set (e.g. ASCII, EBCDIC)
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% - has proper error handling
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% - reasonably efficient (uses a table to do the rotation)
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%
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:- module rot13_verbose.
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:- interface.
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:- import_module io.
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:- pred main(io__state, io__state).
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:- mode main(di, uo) is det.
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:- implementation.
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:- import_module char, int, require.
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% rot13a/2
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% A table to map the alphabetic characters to their rot13 equivalents
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% (fails if the input is not alphabetic).
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:- pred rot13a(char, char).
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:- mode rot13a(in, out) is semidet.
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rot13a('a', 'n').
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rot13a('b', 'o').
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rot13a('c', 'p').
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rot13a('d', 'q').
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rot13a('e', 'r').
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rot13a('f', 's').
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rot13a('g', 't').
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rot13a('h', 'u').
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rot13a('i', 'v').
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rot13a('j', 'w').
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rot13a('k', 'x').
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rot13a('l', 'y').
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rot13a('m', 'z').
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rot13a('n', 'a').
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rot13a('o', 'b').
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rot13a('p', 'c').
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rot13a('q', 'd').
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rot13a('r', 'e').
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rot13a('s', 'f').
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rot13a('t', 'g').
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rot13a('u', 'h').
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rot13a('v', 'i').
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rot13a('w', 'j').
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rot13a('x', 'k').
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rot13a('y', 'l').
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rot13a('z', 'm').
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rot13a('A', 'N').
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rot13a('B', 'O').
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rot13a('C', 'P').
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rot13a('D', 'Q').
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rot13a('E', 'R').
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rot13a('F', 'S').
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rot13a('G', 'T').
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rot13a('H', 'U').
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rot13a('I', 'V').
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rot13a('J', 'W').
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rot13a('K', 'X').
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rot13a('L', 'Y').
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rot13a('M', 'Z').
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rot13a('N', 'A').
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rot13a('O', 'B').
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rot13a('P', 'C').
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rot13a('Q', 'D').
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rot13a('R', 'E').
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rot13a('S', 'F').
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rot13a('T', 'G').
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rot13a('U', 'H').
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rot13a('V', 'I').
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rot13a('W', 'J').
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rot13a('X', 'K').
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rot13a('Y', 'L').
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rot13a('Z', 'M').
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% rot13/2
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% Applies the rot13 algorithm to a character.
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:- pred rot13(char, char).
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:- mode rot13(in, out) is det.
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rot13(Char, RotChar) :-
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( if rot13a(Char, TmpChar) then
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RotChar = TmpChar
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else
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RotChar = Char
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).
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main -->
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io__read_char(Res),
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( { Res = ok(Char) },
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{ rot13(Char, RotChar) },
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io__write_char(RotChar),
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main
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; { Res = eof }
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; { Res = error(ErrorCode) },
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{ io__error_message(ErrorCode, ErrorMessage) },
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io__stderr_stream(StdErr),
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io__write_string(StdErr, "rot13: error reading input: "),
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io__write_string(StdErr, ErrorMessage),
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io__nl(StdErr)
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).
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