Created
March 13, 2017 19:11
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| -module(index). | |
| -export([index_file/1]). | |
| readlines(Name) -> | |
| {ok,File} = file:open(Name,[read]), | |
| extract_content(File,[]). | |
| extract_content(File,Partial) -> | |
| case io:get_line(File,"") of | |
| eof -> file:close(File), Partial; | |
| Line -> {Strip,_} = lists:split(length(Line)-1,Line), extract_content(File,Partial ++ [Strip]) | |
| end. | |
| show_file_contents([L|Ls]) -> | |
| io:format("~s~n",[L]), | |
| show_file_contents(Ls); | |
| show_file_contents([]) -> ok. | |
| nopunct([]) -> []; | |
| nopunct([X|Xs]) -> | |
| case lists:member(X,".,;:\t\n\'\"") of | |
| true -> nopunct(Xs); | |
| false -> [X|nopunct(Xs)] | |
| end. | |
| dedup([],Y) -> Y; | |
| dedup([X|Xs],Y) -> | |
| case lists:member(X,Y) of | |
| false -> dedup(Xs,[X|Y]); | |
| true -> dedup(Xs,Y) | |
| end. | |
| make_index([],Y,_) -> Y; | |
| make_index([X],Y,_) -> Y ++ [{X,X}]; | |
| make_index([X,Nx|Xs],Y,Z) -> | |
| case Nx == (X + 1) of | |
| true -> make_index([Nx|Xs], Y, Z); | |
| _ -> make_index([Nx|Xs], Y ++ [{Z,X}], Nx) | |
| end. | |
| combine_indices({X,I}, []) -> [{X,I}]; | |
| combine_indices({X,I}, [{Y,Indices}|Ys]) -> | |
| case X == Y of | |
| true -> [{Y, Indices ++ I} | Ys]; | |
| _ -> [{Y,Indices}|combine_indices({X,I},Ys)] | |
| end. | |
| index_words([], Word) -> Word; | |
| index_words(Word, []) -> Word; | |
| index_words([X|Xs], Y) -> index_words(Xs,combine_indices(X,Y)). | |
| create_word_index([], Y, _) -> Y; | |
| create_word_index([L|Ls], Y, N) -> | |
| Words = string:tokens(nopunct(L)," "), | |
| Entries = dedup(Words, []), | |
| Indexes = lists:map(fun(X) -> {X,[N]} end, Entries), | |
| create_word_index(Ls, index_words(Indexes,Y), N+1). | |
| index([]) -> []; | |
| index(Lines) -> | |
| lists:map(fun({Word, AllLines}) -> | |
| {Word, make_index(AllLines, [], hd(AllLines))} | |
| end, Lines). | |
| % USAGE | |
| % index:index_file("./gettysburg-address.txt"). | |
| index_file(Name) -> | |
| Lines = readlines(Name), | |
| Indices = create_word_index(Lines,[],1), | |
| index(Indices). | |
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