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Diffstat (limited to 'inttest/neotoma1/mock/neotoma/src/neotoma.erl')
| -rw-r--r-- | inttest/neotoma1/mock/neotoma/src/neotoma.erl | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/inttest/neotoma1/mock/neotoma/src/neotoma.erl b/inttest/neotoma1/mock/neotoma/src/neotoma.erl new file mode 100644 index 0000000..f4102f6 --- /dev/null +++ b/inttest/neotoma1/mock/neotoma/src/neotoma.erl @@ -0,0 +1,145 @@ +-module(neotoma). +-author("Sean Cribbs <seancribbs@gmail.com>"). +-export([file/1, file/2, bootstrap/0]). +-export([main/1]). + +-define(ALL_COMBINATORS, [p_eof, p_optional, p_not, p_assert, p_seq, + p_choose, p_zero_or_more, p_one_or_more, p_label, p_scan, + p_string, p_anything, p_charclass, p_regexp, line, column]). + +-type option() :: {module, atom()} | {output, file:filename()} | {transform_module, atom()} | + {neotoma_priv_dir, file:filename()}. + +%% @doc Handler function for escript. +-spec main(list()) -> ok | no_return(). +main([]) -> + io:format("Usage: neotoma filename [-module output_module] [-output output_dir] [-transform_module transform_module]\n"); +main([Filename | Args]) -> + %% code:priv_dir is unreliable when called in escript context, but + %% escript:script_name does what we want. + PrivDir = filename:join([filename:dirname(escript:script_name()), "priv"]), + file(Filename, [{neotoma_priv_dir, PrivDir} | parse_options(Args)]). + +%% @doc Generates a parser from the specified file. +%% @equiv file(Filename, []) +-spec file(file:filename()) -> ok | {error, atom()}. +file(InputGrammar) -> + file(InputGrammar, []). + +%% @doc Generates a parser from the specified file with the given options. +-spec file(file:filename(), [option()]) -> ok | {error, atom()}. +file(InputGrammar, Options) -> + Basename = filename:basename(InputGrammar, ".peg"), + InputDir = filename:dirname(InputGrammar), + ModuleName = proplists:get_value(module, Options, list_to_atom(Basename)), + OutputDir = proplists:get_value(output, Options, InputDir), + OutputFilename = filename:join(OutputDir, atom_to_list(ModuleName) ++ ".erl"), + TransformModule = proplists:get_value(transform_module, Options, false), + validate_params(filename:absname(InputGrammar), + ModuleName, + TransformModule, + filename:absname(OutputFilename)), + Parsed = parse_grammar(InputGrammar), + Rules = proplists:get_value(rules, Parsed), + Root = proplists:get_value(root, Parsed), + Code = proplists:get_value(code, Parsed), + GenTransform = proplists:get_value(transform, Parsed), + Combinators = proplists:get_value(combinators, Parsed, ?ALL_COMBINATORS), + ModuleAttrs = generate_module_attrs(ModuleName, Combinators), + EntryFuns = generate_entry_functions(Root), + TransformFun = create_transform(TransformModule, OutputDir, GenTransform), + PrivDir = proplists:get_value(neotoma_priv_dir, Options, code:priv_dir(neotoma)), + {ok, PegIncludes} = file:read_file(filename:join([PrivDir, "peg_includes.hrl"])), + file:write_file(OutputFilename, [ModuleAttrs, "\n", Code, "\n", EntryFuns, "\n", Rules, "\n", TransformFun, "\n", PegIncludes]). + +-spec validate_params(file:filename(),atom(),atom(),file:filename()) -> 'ok'. +validate_params(InputGrammar, _, _, OutputFile) when InputGrammar =:= OutputFile -> + throw({badarg, "Input and output file are the same!"}); +validate_params(_,_, false, _) -> ok; +validate_params(_,_, TransformModule, _) when not is_atom(TransformModule) -> + throw({badarg, "transform_module option must be an atom"}); +validate_params(_,Basename, TransformModule, _) when Basename =:= TransformModule -> + throw({badarg, "Transform module named same as parser module!"}); +validate_params(_,_, TransformModule, OutputFile) -> + OutMod = list_to_atom(filename:basename(OutputFile, ".erl")), + case OutMod of + TransformModule -> throw({badarg, "Transform module file same as parser output file!"}); + _ -> ok + end. + +-spec generate_module_attrs(atom(), [atom()]) -> iolist(). +generate_module_attrs(ModName, Combinators) -> + ["-module(", atom_to_list(ModName) ,").\n", + "-export([parse/1,file/1]).\n", + [ generate_combinator_macro(C) || Combinators /= undefined, C <- Combinators ], + "\n" + ]. + +generate_combinator_macro(C) -> + ["-define(", atom_to_list(C), ",true).\n"]. + +-spec generate_entry_functions({iodata(),_}) -> iolist(). +generate_entry_functions(Root) -> + {RootRule,_} = Root, + ["-spec file(file:name()) -> any().\n", + "file(Filename) -> case file:read_file(Filename) of {ok,Bin} -> parse(Bin); Err -> Err end.\n\n", + "-spec parse(binary() | list()) -> any().\n", + "parse(List) when is_list(List) -> parse(unicode:characters_to_binary(List));\n", + "parse(Input) when is_binary(Input) ->\n", + " _ = setup_memo(),\n", + " Result = case '",RootRule,"'(Input,{{line,1},{column,1}}) of\n", + " {AST, <<>>, _Index} -> AST;\n", + " Any -> Any\n" + " end,\n", + " release_memo(), Result.\n"]. + +-spec parse_grammar(file:filename()) -> any(). +parse_grammar(InputFile) -> + case neotoma_parse:file(InputFile) of + {fail, Index} -> + throw({grammar_error, {fail, Index}}); + {Parsed, Remainder, Index} -> + io:format("WARNING: Grammar parse ended unexpectedly at ~p, generated parser may be incorrect.~nRemainder:~n~p", + [Index, Remainder]), + Parsed; + L when is_list(L) -> L; + _ -> throw({error, {unknown, grammar, InputFile}}) + end. + +-spec create_transform(atom() | boolean(),file:filename(),_) -> iolist(). +create_transform(_,_,[]) -> []; +create_transform(false,_,_) -> + "transform(_,Node,_Index) -> Node."; +create_transform(ModName,Dir,_) when is_atom(ModName) -> + XfFile = filename:join(Dir, atom_to_list(ModName) ++ ".erl"), + case filelib:is_regular(XfFile) of + true -> io:format("'~s' already exists, skipping generation.~n", [XfFile]); + false -> generate_transform_stub(XfFile, ModName) + end, + ["transform(Symbol,Node,Index) -> ",atom_to_list(ModName),":transform(Symbol, Node, Index)."]. + +-spec generate_transform_stub(file:filename(), atom()) -> 'ok' | {'error',atom()}. +generate_transform_stub(XfFile,ModName) -> + Data = ["-module(",atom_to_list(ModName),").\n", + "-export([transform/3]).\n\n", + "%% Add clauses to this function to transform syntax nodes\n", + "%% from the parser into semantic output.\n", + "transform(Symbol, Node, _Index) when is_atom(Symbol) ->\n Node."], + file:write_file(XfFile, Data). + +%% @doc Bootstraps the neotoma metagrammar. Intended only for internal development! +%% @equiv file("src/neotoma_parse.peg") +-spec bootstrap() -> 'ok'. +bootstrap() -> + file("priv/neotoma_parse.peg", [{output, "src/"}, {neotoma_priv_dir, "priv"}]). + +%% @doc Parses arguments passed to escript +-spec parse_options(list()) -> list(). +parse_options(["-module", ModName | Rest]) -> + [{module, list_to_atom(ModName)} | parse_options(Rest)]; +parse_options(["-output", Dir | Rest]) -> + [{output, Dir} | parse_options(Rest)]; +parse_options(["-transform_module", ModName | Rest]) -> + [{transform_module, list_to_atom(ModName)} | parse_options(Rest)]; +parse_options([]) -> + []. |