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-rw-r--r--src/rlx_goal.erl263
1 files changed, 263 insertions, 0 deletions
diff --git a/src/rlx_goal.erl b/src/rlx_goal.erl
new file mode 100644
index 0000000..bd3f265
--- /dev/null
+++ b/src/rlx_goal.erl
@@ -0,0 +1,263 @@
+-module(rlx_goal).
+-export([parse/1,file/1]).
+-compile({nowarn_unused_function,[p/4, p/5, p_eof/0, p_optional/1, p_not/1, p_assert/1, p_seq/1, p_and/1, p_choose/1, p_zero_or_more/1, p_one_or_more/1, p_label/2, p_string/1, p_anything/0, p_charclass/1, p_regexp/1, p_attempt/4, line/1, column/1]}).
+
+
+-compile(export_all).
+-spec file(file:name()) -> any().
+file(Filename) -> {ok, Bin} = file:read_file(Filename), parse(Bin).
+
+-spec parse(binary() | list()) -> any().
+parse(List) when is_list(List) -> parse(list_to_binary(List));
+parse(Input) when is_binary(Input) ->
+ setup_memo(),
+ Result = case 'constraint'(Input,{{line,1},{column,1}}) of
+ {AST, <<>>, _Index} -> AST;
+ Any -> Any
+ end,
+ release_memo(), Result.
+
+'constraint'(Input, Index) ->
+ p(Input, Index, 'constraint', fun(I,D) -> (p_choose([p_seq([p_optional(fun 'ws'/2), fun 'app_name'/2, p_optional(fun 'ws'/2), fun 'between_op'/2, p_optional(fun 'ws'/2), fun 'version'/2, p_optional(fun 'ws'/2), p_string(<<",">>), p_optional(fun 'ws'/2), fun 'version'/2, p_optional(fun 'ws'/2), p_not(p_anything())]), p_seq([p_optional(fun 'ws'/2), fun 'app_name'/2, p_optional(fun 'ws'/2), fun 'constraint_op'/2, p_optional(fun 'ws'/2), fun 'version'/2, p_optional(fun 'ws'/2), p_not(p_anything())]), p_seq([p_optional(fun 'ws'/2), fun 'app_name'/2, p_optional(fun 'ws'/2), p_not(p_anything())])]))(I,D) end, fun(Node, _Idx) ->
+ case Node of
+ [_,AppName,_, _] ->
+ {ok, AppName};
+ [_,AppName,_,Op,_,Vsn,_, _] ->
+ {ok,
+ {AppName,
+ rcl_goal_utils:to_vsn(Vsn),
+ rcl_goal_utils:to_op(Op)}};
+ [_,AppName,_,Op,_,Vsn1,_,_,_,Vsn2,_,_] ->
+ {ok,
+ {AppName,
+ rcl_goal_utils:to_vsn(Vsn1),
+ rcl_goal_utils:to_vsn(Vsn2),
+ rcl_goal_utils:to_op(Op)}};
+ _ ->
+ io:format("~p~n", [Node])
+ end
+ end).
+
+'ws'(Input, Index) ->
+ p(Input, Index, 'ws', fun(I,D) -> (p_charclass(<<"[\s\t\n\s\r]">>))(I,D) end, fun(Node, Idx) -> transform('ws', Node, Idx) end).
+
+'app_name'(Input, Index) ->
+ p(Input, Index, 'app_name', fun(I,D) -> (p_one_or_more(p_charclass(<<"[a-zA-Z0-9_]">>)))(I,D) end, fun(Node, _Idx) -> erlang:list_to_atom(erlang:binary_to_list(erlang:iolist_to_binary(Node))) end).
+
+'between_op'(Input, Index) ->
+ p(Input, Index, 'between_op', fun(I,D) -> (p_seq([p_string(<<":">>), p_optional(fun 'ws'/2), p_choose([p_string(<<"btwn">>), p_string(<<"between">>)]), p_optional(fun 'ws'/2), p_string(<<":">>)]))(I,D) end, fun(Node, _Idx) -> case Node of
+ [C,_,Op,_,C] -> erlang:iolist_to_binary([C,Op,C]);
+ _ -> Node
+ end
+ end).
+
+'constraint_op'(Input, Index) ->
+ p(Input, Index, 'constraint_op', fun(I,D) -> (p_choose([p_string(<<"=">>), p_string(<<"-">>), p_string(<<"<=">>), p_string(<<"<">>), p_string(<<"~>">>), p_string(<<">=">>), p_string(<<">">>), fun 'word_constraint_op'/2, p_string(<<":">>)]))(I,D) end, fun(Node, Idx) -> transform('constraint_op', Node, Idx) end).
+
+'word_constraint_op'(Input, Index) ->
+ p(Input, Index, 'word_constraint_op', fun(I,D) -> (p_seq([p_string(<<":">>), p_optional(fun 'ws'/2), p_choose([p_string(<<"gte">>), p_string(<<"lte">>), p_string(<<"gt">>), p_string(<<"lt">>), p_string(<<"pes">>)]), p_optional(fun 'ws'/2), p_string(<<":">>)]))(I,D) end, fun(Node, _Idx) -> case Node of
+ [C,_,Op,_,C] -> erlang:iolist_to_binary([C,Op,C]);
+ _ -> Node
+ end
+ end).
+
+'version'(Input, Index) ->
+ p(Input, Index, 'version', fun(I,D) -> (p_one_or_more(p_charclass(<<"[0-9a-zA-Z-+.]">>)))(I,D) end, fun(Node, Idx) -> transform('version', Node, Idx) end).
+
+
+transform(_,Node,_Index) -> Node.
+
+p(Inp, Index, Name, ParseFun) ->
+ p(Inp, Index, Name, ParseFun, fun(N, _Idx) -> N end).
+
+p(Inp, StartIndex, Name, ParseFun, TransformFun) ->
+ case get_memo(StartIndex, Name) of % See if the current reduction is memoized
+ {ok, Memo} -> %Memo; % If it is, return the stored result
+ Memo;
+ _ -> % If not, attempt to parse
+ Result = case ParseFun(Inp, StartIndex) of
+ {fail,_} = Failure -> % If it fails, memoize the failure
+ Failure;
+ {Match, InpRem, NewIndex} -> % If it passes, transform and memoize the result.
+ Transformed = TransformFun(Match, StartIndex),
+ {Transformed, InpRem, NewIndex}
+ end,
+ memoize(StartIndex, Name, Result),
+ Result
+ end.
+
+setup_memo() ->
+ put({parse_memo_table, ?MODULE}, ets:new(?MODULE, [set])).
+
+release_memo() ->
+ ets:delete(memo_table_name()).
+
+memoize(Index, Name, Result) ->
+ Memo = case ets:lookup(memo_table_name(), Index) of
+ [] -> [];
+ [{Index, Plist}] -> Plist
+ end,
+ ets:insert(memo_table_name(), {Index, [{Name, Result}|Memo]}).
+
+get_memo(Index, Name) ->
+ case ets:lookup(memo_table_name(), Index) of
+ [] -> {error, not_found};
+ [{Index, Plist}] ->
+ case proplists:lookup(Name, Plist) of
+ {Name, Result} -> {ok, Result};
+ _ -> {error, not_found}
+ end
+ end.
+
+memo_table_name() ->
+ get({parse_memo_table, ?MODULE}).
+
+p_eof() ->
+ fun(<<>>, Index) -> {eof, [], Index};
+ (_, Index) -> {fail, {expected, eof, Index}} end.
+
+p_optional(P) ->
+ fun(Input, Index) ->
+ case P(Input, Index) of
+ {fail,_} -> {[], Input, Index};
+ {_, _, _} = Success -> Success
+ end
+ end.
+
+p_not(P) ->
+ fun(Input, Index)->
+ case P(Input,Index) of
+ {fail,_} ->
+ {[], Input, Index};
+ {Result, _, _} -> {fail, {expected, {no_match, Result},Index}}
+ end
+ end.
+
+p_assert(P) ->
+ fun(Input,Index) ->
+ case P(Input,Index) of
+ {fail,_} = Failure-> Failure;
+ _ -> {[], Input, Index}
+ end
+ end.
+
+p_and(P) ->
+ p_seq(P).
+
+p_seq(P) ->
+ fun(Input, Index) ->
+ p_all(P, Input, Index, [])
+ end.
+
+p_all([], Inp, Index, Accum ) -> {lists:reverse( Accum ), Inp, Index};
+p_all([P|Parsers], Inp, Index, Accum) ->
+ case P(Inp, Index) of
+ {fail, _} = Failure -> Failure;
+ {Result, InpRem, NewIndex} -> p_all(Parsers, InpRem, NewIndex, [Result|Accum])
+ end.
+
+p_choose(Parsers) ->
+ fun(Input, Index) ->
+ p_attempt(Parsers, Input, Index, none)
+ end.
+
+p_attempt([], _Input, _Index, Failure) -> Failure;
+p_attempt([P|Parsers], Input, Index, FirstFailure)->
+ case P(Input, Index) of
+ {fail, _} = Failure ->
+ case FirstFailure of
+ none -> p_attempt(Parsers, Input, Index, Failure);
+ _ -> p_attempt(Parsers, Input, Index, FirstFailure)
+ end;
+ Result -> Result
+ end.
+
+p_zero_or_more(P) ->
+ fun(Input, Index) ->
+ p_scan(P, Input, Index, [])
+ end.
+
+p_one_or_more(P) ->
+ fun(Input, Index)->
+ Result = p_scan(P, Input, Index, []),
+ case Result of
+ {[_|_], _, _} ->
+ Result;
+ _ ->
+ {fail, {expected, Failure, _}} = P(Input,Index),
+ {fail, {expected, {at_least_one, Failure}, Index}}
+ end
+ end.
+
+p_label(Tag, P) ->
+ fun(Input, Index) ->
+ case P(Input, Index) of
+ {fail,_} = Failure ->
+ Failure;
+ {Result, InpRem, NewIndex} ->
+ {{Tag, Result}, InpRem, NewIndex}
+ end
+ end.
+
+p_scan(_, [], Index, Accum) -> {lists:reverse( Accum ), [], Index};
+p_scan(P, Inp, Index, Accum) ->
+ case P(Inp, Index) of
+ {fail,_} -> {lists:reverse(Accum), Inp, Index};
+ {Result, InpRem, NewIndex} -> p_scan(P, InpRem, NewIndex, [Result | Accum])
+ end.
+
+p_string(S) when is_list(S) -> p_string(list_to_binary(S));
+p_string(S) ->
+ Length = erlang:byte_size(S),
+ fun(Input, Index) ->
+ try
+ <<S:Length/binary, Rest/binary>> = Input,
+ {S, Rest, p_advance_index(S, Index)}
+ catch
+ error:{badmatch,_} -> {fail, {expected, {string, S}, Index}}
+ end
+ end.
+
+p_anything() ->
+ fun(<<>>, Index) -> {fail, {expected, any_character, Index}};
+ (Input, Index) when is_binary(Input) ->
+ <<C/utf8, Rest/binary>> = Input,
+ {<<C/utf8>>, Rest, p_advance_index(<<C/utf8>>, Index)}
+ end.
+
+p_charclass(Class) ->
+ {ok, RE} = re:compile(Class, [unicode, dotall]),
+ fun(Inp, Index) ->
+ case re:run(Inp, RE, [anchored]) of
+ {match, [{0, Length}|_]} ->
+ {Head, Tail} = erlang:split_binary(Inp, Length),
+ {Head, Tail, p_advance_index(Head, Index)};
+ _ -> {fail, {expected, {character_class, binary_to_list(Class)}, Index}}
+ end
+ end.
+
+p_regexp(Regexp) ->
+ {ok, RE} = re:compile(Regexp, [unicode, dotall, anchored]),
+ fun(Inp, Index) ->
+ case re:run(Inp, RE) of
+ {match, [{0, Length}|_]} ->
+ {Head, Tail} = erlang:split_binary(Inp, Length),
+ {Head, Tail, p_advance_index(Head, Index)};
+ _ -> {fail, {expected, {regexp, binary_to_list(Regexp)}, Index}}
+ end
+ end.
+
+line({{line,L},_}) -> L;
+line(_) -> undefined.
+
+column({_,{column,C}}) -> C;
+column(_) -> undefined.
+
+p_advance_index(MatchedInput, Index) when is_list(MatchedInput) orelse is_binary(MatchedInput)-> % strings
+ lists:foldl(fun p_advance_index/2, Index, unicode:characters_to_list(MatchedInput));
+p_advance_index(MatchedInput, Index) when is_integer(MatchedInput) -> % single characters
+ {{line, Line}, {column, Col}} = Index,
+ case MatchedInput of
+ $\n -> {{line, Line+1}, {column, 1}};
+ _ -> {{line, Line}, {column, Col+1}}
+ end.
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