From 84adefa331c4159d432d22840663c38f155cd4c1 Mon Sep 17 00:00:00 2001 From: Erlang/OTP Date: Fri, 20 Nov 2009 14:54:40 +0000 Subject: The R13B03 release. --- lib/parsetools/include/yeccpre.hrl | 180 +++++++++++++++++++++++++++++++++++++ 1 file changed, 180 insertions(+) create mode 100644 lib/parsetools/include/yeccpre.hrl (limited to 'lib/parsetools/include/yeccpre.hrl') diff --git a/lib/parsetools/include/yeccpre.hrl b/lib/parsetools/include/yeccpre.hrl new file mode 100644 index 0000000000..2ffa13d6a7 --- /dev/null +++ b/lib/parsetools/include/yeccpre.hrl @@ -0,0 +1,180 @@ +%% +%% %CopyrightBegin% +%% +%% Copyright Ericsson AB 1996-2009. All Rights Reserved. +%% +%% The contents of this file are subject to the Erlang Public License, +%% Version 1.1, (the "License"); you may not use this file except in +%% compliance with the License. You should have received a copy of the +%% Erlang Public License along with this software. If not, it can be +%% retrieved online at http://www.erlang.org/. +%% +%% Software distributed under the License is distributed on an "AS IS" +%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See +%% the License for the specific language governing rights and limitations +%% under the License. +%% +%% %CopyrightEnd% +%% + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +% The parser generator will insert appropriate declarations before this line.% + +-type(yecc_ret() :: {'error', _} | {'ok', _}). + +-spec parse(Tokens :: list()) -> yecc_ret(). +parse(Tokens) -> + yeccpars0(Tokens, {no_func, no_line}, 0, [], []). + +-spec(parse_and_scan/1 :: + ({function() | {atom(), atom()}, [_]} | {atom(), atom(), [_]}) -> + yecc_ret()). +parse_and_scan({F, A}) -> % Fun or {M, F} + yeccpars0([], {{F, A}, no_line}, 0, [], []); +parse_and_scan({M, F, A}) -> + yeccpars0([], {{{M, F}, A}, no_line}, 0, [], []). + +-spec(format_error/1 :: (any()) -> [char() | list()]). +format_error(Message) -> + case io_lib:deep_char_list(Message) of + true -> + Message; + _ -> + io_lib:write(Message) + end. + +% To be used in grammar files to throw an error message to the parser +% toplevel. Doesn't have to be exported! +-compile({nowarn_unused_function, return_error/2}). +-spec(return_error/2 :: (integer(), any()) -> no_return()). +return_error(Line, Message) -> + throw({error, {Line, ?MODULE, Message}}). + +-define(CODE_VERSION, "1.4"). + +yeccpars0(Tokens, Tzr, State, States, Vstack) -> + try yeccpars1(Tokens, Tzr, State, States, Vstack) + catch + error: Error -> + Stacktrace = erlang:get_stacktrace(), + try yecc_error_type(Error, Stacktrace) of + {syntax_error, Token} -> + yeccerror(Token); + {missing_in_goto_table=Tag, Symbol, State} -> + Desc = {Symbol, State, Tag}, + erlang:raise(error, {yecc_bug, ?CODE_VERSION, Desc}, + Stacktrace) + catch _:_ -> erlang:raise(error, Error, Stacktrace) + end; + %% Probably thrown from return_error/2: + throw: {error, {_Line, ?MODULE, _M}} = Error -> + Error + end. + +yecc_error_type(function_clause, [{?MODULE,F,[State,_,_,_,Token,_,_]} | _]) -> + case atom_to_list(F) of + "yeccpars2" ++ _ -> + {syntax_error, Token}; + "yeccgoto_" ++ SymbolL -> + {ok,[{atom,_,Symbol}],_} = erl_scan:string(SymbolL), + {missing_in_goto_table, Symbol, State} + end. + +yeccpars1([Token | Tokens], Tzr, State, States, Vstack) -> + yeccpars2(State, element(1, Token), States, Vstack, Token, Tokens, Tzr); +yeccpars1([], {{F, A},_Line}, State, States, Vstack) -> + case apply(F, A) of + {ok, Tokens, Endline} -> + yeccpars1(Tokens, {{F, A}, Endline}, State, States, Vstack); + {eof, Endline} -> + yeccpars1([], {no_func, Endline}, State, States, Vstack); + {error, Descriptor, _Endline} -> + {error, Descriptor} + end; +yeccpars1([], {no_func, no_line}, State, States, Vstack) -> + Line = 999999, + yeccpars2(State, '$end', States, Vstack, yecc_end(Line), [], + {no_func, Line}); +yeccpars1([], {no_func, Endline}, State, States, Vstack) -> + yeccpars2(State, '$end', States, Vstack, yecc_end(Endline), [], + {no_func, Endline}). + +%% yeccpars1/7 is called from generated code. +%% +%% When using the {includefile, Includefile} option, make sure that +%% yeccpars1/7 can be found by parsing the file without following +%% include directives. yecc will otherwise assume that an old +%% yeccpre.hrl is included (one which defines yeccpars1/5). +yeccpars1(State1, State, States, Vstack, Token0, [Token | Tokens], Tzr) -> + yeccpars2(State, element(1, Token), [State1 | States], + [Token0 | Vstack], Token, Tokens, Tzr); +yeccpars1(State1, State, States, Vstack, Token0, [], {{_F,_A}, _Line}=Tzr) -> + yeccpars1([], Tzr, State, [State1 | States], [Token0 | Vstack]); +yeccpars1(State1, State, States, Vstack, Token0, [], {no_func, no_line}) -> + Line = yecctoken_end_location(Token0), + yeccpars2(State, '$end', [State1 | States], [Token0 | Vstack], + yecc_end(Line), [], {no_func, Line}); +yeccpars1(State1, State, States, Vstack, Token0, [], {no_func, Line}) -> + yeccpars2(State, '$end', [State1 | States], [Token0 | Vstack], + yecc_end(Line), [], {no_func, Line}). + +% For internal use only. +yecc_end({Line,_Column}) -> + {'$end', Line}; +yecc_end(Line) -> + {'$end', Line}. + +yecctoken_end_location(Token) -> + try + {text, Str} = erl_scan:token_info(Token, text), + {line, Line} = erl_scan:token_info(Token, line), + Parts = re:split(Str, "\n"), + Dline = length(Parts) - 1, + Yline = Line + Dline, + case erl_scan:token_info(Token, column) of + {column, Column} -> + Col = byte_size(lists:last(Parts)), + {Yline, Col + if Dline =:= 0 -> Column; true -> 1 end}; + undefined -> + Yline + end + catch _:_ -> + yecctoken_location(Token) + end. + +yeccerror(Token) -> + Text = yecctoken_to_string(Token), + Location = yecctoken_location(Token), + {error, {Location, ?MODULE, ["syntax error before: ", Text]}}. + +yecctoken_to_string(Token) -> + case catch erl_scan:token_info(Token, text) of + {text, Txt} -> Txt; + _ -> yecctoken2string(Token) + end. + +yecctoken_location(Token) -> + case catch erl_scan:token_info(Token, location) of + {location, Loc} -> Loc; + _ -> element(2, Token) + end. + +yecctoken2string({atom, _, A}) -> io_lib:write(A); +yecctoken2string({integer,_,N}) -> io_lib:write(N); +yecctoken2string({float,_,F}) -> io_lib:write(F); +yecctoken2string({char,_,C}) -> io_lib:write_char(C); +yecctoken2string({var,_,V}) -> io_lib:format("~s", [V]); +yecctoken2string({string,_,S}) -> io_lib:write_unicode_string(S); +yecctoken2string({reserved_symbol, _, A}) -> io_lib:write(A); +yecctoken2string({_Cat, _, Val}) -> io_lib:write(Val); +yecctoken2string({dot, _}) -> "'.'"; +yecctoken2string({'$end', _}) -> + []; +yecctoken2string({Other, _}) when is_atom(Other) -> + io_lib:write(Other); +yecctoken2string(Other) -> + io_lib:write(Other). + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + + -- cgit v1.2.3