今日学习创建一个ETS表
下面是代码实现
-module(lib_trigrams).-export([make_ets_set/0, make_ets_ordered_set/0]).
for_each_trigram_in_the_english_language(F, A0) ->{ok, Bin0} = file:read_file("test.txt"),Bin = zlib:gunzip(Bin0),scan_word_list(binary_to_list(Bin), F, A0).scan_word_list([], _, A) ->A;
scan_word_list(L, F, A) ->{word, L1} = get_next_word(L, []),A1 = scan_trigrams([$\s | word], F, A),scan_word_list(L1, F, A1).get_next_word([$\r, $\n | T], L) ->{lists:reverse([$\s | L]), T};
get_next_word([H | T], L) ->get_next_word(T, [H | L]);
get_next_word([], L) ->{lists:reverse([$\s | L]), []}.scan_trigrams([X, Y, Z], F, A) ->F([X, Y, Z], A);
scan_trigrams([X, Y, Z | T], F, A) ->A1 = F([X, Y, Z], A),scan_trigrams([Y, Z | T], F, A1);
scan_trigrams(_, _, A) ->A.make_ets_ordered_set() -> make_a_set(ordered_set, "trigramsOS.tab").
make_ets_set() -> make_a_set(set, "trigramsS.tab").make_a_set(Type, FileName) ->Tab = ets:new(table, [Type]),F = fun(Str, _) -> ets:insert(Tab, {list_to_binary(Str)}) end,for_each_trigram_in_the_english_language(F, 0),ets:tab2file(Tab, FileName),Size = ets:info(Tab, size),ets:delete(Tab),Size.
书上代码中的reverse没有lists，因此会报错，需要改为lists：reverse
搞了个txt文本之后报错为数据异常，有点没搞明白txt文档里面要存什么数据
