%% %% %CopyrightBegin% %% %% Copyright Ericsson AB 1996-2017. All Rights Reserved. %% %% Licensed under the Apache License, Version 2.0 (the "License"); %% you may not use this file except in compliance with the License. %% You may obtain a copy of the License at %% %% http://www.apache.org/licenses/LICENSE-2.0 %% %% Unless required by applicable law or agreed to in writing, software %% distributed under the License is distributed on an "AS IS" BASIS, %% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. %% See the License for the specific language governing permissions and %% limitations under the License. %% %% %CopyrightEnd% %% %% Erlang token scanning functions of io library. %% For handling ISO 8859-1 (Latin-1) we use the following type %% information: %% %% 000 - 037 NUL - US control %% 040 - 057 SPC - / punctuation %% 060 - 071 0 - 9 digit %% 072 - 100 : - @ punctuation %% 101 - 132 A - Z uppercase %% 133 - 140 [ - ` punctuation %% 141 - 172 a - z lowercase %% 173 - 176 { - ~ punctuation %% 177 DEL control %% 200 - 237 control %% 240 - 277 NBSP - ¿ punctuation %% 300 - 326 À - Ö uppercase %% 327 × punctuation %% 330 - 336 Ø - Þ uppercase %% 337 - 366 ß - ö lowercase %% 367 ÷ punctuation %% 370 - 377 ø - ÿ lowercase %% %% Many punctuation characters have special meaning: %% $\s, $_, $", $$, $%, $', $. %% DEL is a punctuation. %% %% Must watch using × \327, very close to x \170. -module(erl_scan). %%% External exports -export([string/1,string/2,string/3,tokens/3,tokens/4, format_error/1,reserved_word/1]). -export([column/1,end_location/1,line/1,location/1,text/1, category/1,symbol/1]). %%% Private -export([continuation_location/1]). -export_type([error_info/0, options/0, return_cont/0, token/0, tokens_result/0]). %%% %%% Defines and type definitions %%% -define(COLUMN(C), (is_integer(C) andalso C >= 1)). %% Line numbers less than zero have always been allowed: -define(ALINE(L), is_integer(L)). -define(STRING(S), is_list(S)). -define(RESWORDFUN(F), is_function(F, 1)). -type category() :: atom(). -type resword_fun() :: fun((atom()) -> boolean()). -type option() :: 'return' | 'return_white_spaces' | 'return_comments' | 'text' | {'reserved_word_fun', resword_fun()}. -type options() :: option() | [option()]. -type symbol() :: atom() | float() | integer() | string(). -type token() :: {category(), Anno :: erl_anno:anno(), symbol()} | {category(), Anno :: erl_anno:anno()}. -type tokens() :: [token()]. -type error_description() :: term(). -type error_info() :: {erl_anno:location(), module(), error_description()}. %%% Local record. -record(erl_scan, {resword_fun = fun reserved_word/1 :: resword_fun(), ws = false :: boolean(), comment = false :: boolean(), text = false :: boolean()}). %%---------------------------------------------------------------------------- -spec format_error(ErrorDescriptor) -> string() when ErrorDescriptor :: error_description(). format_error({string,Quote,Head}) -> lists:flatten(["unterminated " ++ string_thing(Quote) ++ " starting with " ++ io_lib:write_string(Head, Quote)]); format_error({illegal,Type}) -> lists:flatten(io_lib:fwrite("illegal ~w", [Type])); format_error(char) -> "unterminated character"; format_error({base,Base}) -> lists:flatten(io_lib:fwrite("illegal base '~w'", [Base])); format_error(Other) -> lists:flatten(io_lib:write(Other)). -spec string(String) -> Return when String :: string(), Return :: {'ok', Tokens :: tokens(), EndLocation} | {'error', ErrorInfo :: error_info(), ErrorLocation}, EndLocation :: erl_anno:location(), ErrorLocation :: erl_anno:location(). string(String) -> string(String, 1, []). -spec string(String, StartLocation) -> Return when String :: string(), Return :: {'ok', Tokens :: tokens(), EndLocation} | {'error', ErrorInfo :: error_info(), ErrorLocation}, StartLocation :: erl_anno:location(), EndLocation :: erl_anno:location(), ErrorLocation :: erl_anno:location(). string(String, StartLocation) -> string(String, StartLocation, []). -spec string(String, StartLocation, Options) -> Return when String :: string(), Options :: options(), Return :: {'ok', Tokens :: tokens(), EndLocation} | {'error', ErrorInfo :: error_info(), ErrorLocation}, StartLocation :: erl_anno:location(), EndLocation :: erl_anno:location(), ErrorLocation :: erl_anno:location(). string(String, Line, Options) when ?STRING(String), ?ALINE(Line) -> string1(String, options(Options), Line, no_col, []); string(String, {Line,Column}, Options) when ?STRING(String), ?ALINE(Line), ?COLUMN(Column) -> string1(String, options(Options), Line, Column, []). -type char_spec() :: string() | 'eof'. -type cont_fun() :: fun((char_spec(), #erl_scan{}, erl_anno:line(), erl_anno:column(), tokens(), any()) -> any()). -opaque return_cont() :: {erl_scan_continuation, string(), erl_anno:column(), tokens(), erl_anno:line(), #erl_scan{}, any(), cont_fun()}. -type tokens_result() :: {'ok', Tokens :: tokens(), EndLocation :: erl_anno:location()} | {'eof', EndLocation :: erl_anno:location()} | {'error', ErrorInfo :: error_info(), EndLocation :: erl_anno:location()}. -spec tokens(Continuation, CharSpec, StartLocation) -> Return when Continuation :: return_cont() | [], CharSpec :: char_spec(), StartLocation :: erl_anno:location(), Return :: {'done',Result :: tokens_result(),LeftOverChars :: char_spec()} | {'more', Continuation1 :: return_cont()}. tokens(Cont, CharSpec, StartLocation) -> tokens(Cont, CharSpec, StartLocation, []). -spec tokens(Continuation, CharSpec, StartLocation, Options) -> Return when Continuation :: return_cont() | [], CharSpec :: char_spec(), StartLocation :: erl_anno:location(), Options :: options(), Return :: {'done',Result :: tokens_result(),LeftOverChars :: char_spec()} | {'more', Continuation1 :: return_cont()}. tokens([], CharSpec, Line, Options) when ?ALINE(Line) -> tokens1(CharSpec, options(Options), Line, no_col, [], fun scan/6, []); tokens([], CharSpec, {Line,Column}, Options) when ?ALINE(Line), ?COLUMN(Column) -> tokens1(CharSpec, options(Options), Line, Column, [], fun scan/6, []); tokens({erl_scan_continuation,Cs,Col,Toks,Line,St,Any,Fun}, CharSpec, _Loc, _Opts) -> tokens1(Cs++CharSpec, St, Line, Col, Toks, Fun, Any). continuation_location({erl_scan_continuation,_,no_col,_,Line,_,_,_}) -> Line; continuation_location({erl_scan_continuation,_,Col,_,Line,_,_,_}) -> {Line,Col}. -spec column(Token) -> erl_anno:column() | 'undefined' when Token :: token(). column(Token) -> erl_anno:column(element(2, Token)). -spec end_location(Token) -> erl_anno:location() | 'undefined' when Token :: token(). end_location(Token) -> erl_anno:end_location(element(2, Token)). -spec line(Token) -> erl_anno:line() when Token :: token(). line(Token) -> erl_anno:line(element(2, Token)). -spec location(Token) -> erl_anno:location() when Token :: token(). location(Token) -> erl_anno:location(element(2, Token)). -spec text(Token) -> erl_anno:text() | 'undefined' when Token :: token(). text(Token) -> erl_anno:text(element(2, Token)). -spec category(Token) -> category() when Token :: token(). category({Category,_Anno}) -> Category; category({Category,_Anno,_Symbol}) -> Category; category(T) -> erlang:error(badarg, [T]). -spec symbol(Token) -> symbol() when Token :: token(). symbol({Category,_Anno}) -> Category; symbol({_Category,_Anno,Symbol}) -> Symbol; symbol(T) -> erlang:error(badarg, [T]). %%% %%% Local functions %%% string_thing($') -> "atom"; %' Stupid Emacs string_thing(_) -> "string". -define(WHITE_SPACE(C), is_integer(C) andalso (C >= $\000 andalso C =< $\s orelse C >= $\200 andalso C =< $\240)). -define(DIGIT(C), C >= $0, C =< $9). -define(CHAR(C), is_integer(C), C >= 0). -define(UNICODE(C), is_integer(C) andalso (C >= 0 andalso C < 16#D800 orelse C > 16#DFFF andalso C < 16#FFFE orelse C > 16#FFFF andalso C =< 16#10FFFF)). -define(UNI255(C), C >= 0, C =< 16#ff). options(Opts0) when is_list(Opts0) -> Opts = lists:foldr(fun expand_opt/2, [], Opts0), [RW_fun] = case opts(Opts, [reserved_word_fun], []) of badarg -> erlang:error(badarg, [Opts0]); R -> R end, Comment = proplists:get_bool(return_comments, Opts), WS = proplists:get_bool(return_white_spaces, Opts), Txt = proplists:get_bool(text, Opts), #erl_scan{resword_fun = RW_fun, comment = Comment, ws = WS, text = Txt}; options(Opt) -> options([Opt]). opts(Options, [Key|Keys], L) -> V = case lists:keyfind(Key, 1, Options) of {reserved_word_fun,F} when ?RESWORDFUN(F) -> {ok,F}; {Key,_} -> badarg; false -> {ok,default_option(Key)} end, case V of badarg -> badarg; {ok,Value} -> opts(Options, Keys, [Value|L]) end; opts(_Options, [], L) -> lists:reverse(L). default_option(reserved_word_fun) -> fun reserved_word/1. expand_opt(return, Os) -> [return_comments,return_white_spaces|Os]; expand_opt(O, Os) -> [O|Os]. tokens1(Cs, St, Line, Col, Toks, Fun, Any) when ?STRING(Cs); Cs =:= eof -> case Fun(Cs, St, Line, Col, Toks, Any) of {more,{Cs0,Ncol,Ntoks,Nline,Nany,Nfun}} -> {more,{erl_scan_continuation,Cs0,Ncol,Ntoks,Nline,St,Nany,Nfun}}; {ok,Toks0,eof,Nline,Ncol} -> Res = case Toks0 of [] -> {eof,location(Nline, Ncol)}; _ -> {ok,lists:reverse(Toks0),location(Nline,Ncol)} end, {done,Res,eof}; {ok,Toks0,Rest,Nline,Ncol} -> {done,{ok,lists:reverse(Toks0),location(Nline, Ncol)},Rest}; {{error,_,_}=Error,Rest} -> {done,Error,Rest} end. string1(Cs, St, Line, Col, Toks) -> case scan1(Cs, St, Line, Col, Toks) of {more,{Cs0,Ncol,Ntoks,Nline,Any,Fun}} -> case Fun(Cs0++eof, St, Nline, Ncol, Ntoks, Any) of {ok,Toks1,_Rest,Line2,Col2} -> {ok,lists:reverse(Toks1),location(Line2, Col2)}; {{error,_,_}=Error,_Rest} -> Error end; {ok,Ntoks,[_|_]=Rest,Nline,Ncol} -> string1(Rest, St, Nline, Ncol, Ntoks); {ok,Ntoks,_,Nline,Ncol} -> {ok,lists:reverse(Ntoks),location(Nline, Ncol)}; {{error,_,_}=Error,_Rest} -> Error end. scan(Cs, St, Line, Col, Toks, _) -> scan1(Cs, St, Line, Col, Toks). scan1([$\s|Cs], St, Line, Col, Toks) when St#erl_scan.ws -> scan_spcs(Cs, St, Line, Col, Toks, 1); scan1([$\s|Cs], St, Line, Col, Toks) -> skip_white_space(Cs, St, Line, Col, Toks, 1); scan1([$\n|Cs], St, Line, Col, Toks) when St#erl_scan.ws -> scan_newline(Cs, St, Line, Col, Toks); scan1([$\n|Cs], St, Line, Col, Toks) -> skip_white_space(Cs, St, Line+1, new_column(Col, 1), Toks, 0); scan1([C|Cs], St, Line, Col, Toks) when C >= $A, C =< $Z -> scan_variable(Cs, St, Line, Col, Toks, [C]); scan1([C|Cs], St, Line, Col, Toks) when C >= $a, C =< $z -> scan_atom(Cs, St, Line, Col, Toks, [C]); %% Optimization: some very common punctuation characters: scan1([$,|Cs], St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, ",", ',', 1); scan1([$(|Cs], St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, "(", '(', 1); scan1([$)|Cs], St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, ")", ')', 1); scan1([${|Cs], St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, "{", '{', 1); scan1([$}|Cs], St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, "}", '}', 1); scan1([$[|Cs], St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, "[", '[', 1); scan1([$]|Cs], St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, "]", ']', 1); scan1([$;|Cs], St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, ";", ';', 1); scan1([$_=C|Cs], St, Line, Col, Toks) -> scan_variable(Cs, St, Line, Col, Toks, [C]); %% More punctuation characters below. scan1([$\%|Cs], St, Line, Col, Toks) when not St#erl_scan.comment -> skip_comment(Cs, St, Line, Col, Toks, 1); scan1([$\%=C|Cs], St, Line, Col, Toks) -> scan_comment(Cs, St, Line, Col, Toks, [C]); scan1([C|Cs], St, Line, Col, Toks) when ?DIGIT(C) -> scan_number(Cs, St, Line, Col, Toks, [C]); scan1("..."++Cs, St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, "...", '...', 3); scan1(".."=Cs, _St, Line, Col, Toks) -> {more,{Cs,Col,Toks,Line,[],fun scan/6}}; scan1(".."++Cs, St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, "..", '..', 2); scan1("."=Cs, _St, Line, Col, Toks) -> {more,{Cs,Col,Toks,Line,[],fun scan/6}}; scan1([$.=C|Cs], St, Line, Col, Toks) -> scan_dot(Cs, St, Line, Col, Toks, [C]); scan1([$"|Cs], St, Line, Col, Toks) -> %" Emacs State0 = {[],[],Line,Col}, scan_string(Cs, St, Line, incr_column(Col, 1), Toks, State0); scan1([$'|Cs], St, Line, Col, Toks) -> %' Emacs State0 = {[],[],Line,Col}, scan_qatom(Cs, St, Line, incr_column(Col, 1), Toks, State0); scan1([$$|Cs], St, Line, Col, Toks) -> scan_char(Cs, St, Line, Col, Toks); scan1([$\r|Cs], St, Line, Col, Toks) when St#erl_scan.ws -> white_space_end(Cs, St, Line, Col, Toks, 1, "\r"); scan1([C|Cs], St, Line, Col, Toks) when C >= $ß, C =< $ÿ, C =/= $÷ -> scan_atom(Cs, St, Line, Col, Toks, [C]); scan1([C|Cs], St, Line, Col, Toks) when C >= $À, C =< $Þ, C /= $× -> scan_variable(Cs, St, Line, Col, Toks, [C]); scan1([$\t|Cs], St, Line, Col, Toks) when St#erl_scan.ws -> scan_tabs(Cs, St, Line, Col, Toks, 1); scan1([$\t|Cs], St, Line, Col, Toks) -> skip_white_space(Cs, St, Line, Col, Toks, 1); scan1([C|Cs], St, Line, Col, Toks) when ?WHITE_SPACE(C) -> case St#erl_scan.ws of true -> scan_white_space(Cs, St, Line, Col, Toks, [C]); false -> skip_white_space(Cs, St, Line, Col, Toks, 1) end; %% Punctuation characters and operators, first recognise multiples. %% << <- <= scan1("<<"++Cs, St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, "<<", '<<', 2); scan1("<-"++Cs, St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, "<-", '<-', 2); scan1("<="++Cs, St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, "<=", '<=', 2); scan1("<"=Cs, _St, Line, Col, Toks) -> {more,{Cs,Col,Toks,Line,[],fun scan/6}}; %% >> >= scan1(">>"++Cs, St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, ">>", '>>', 2); scan1(">="++Cs, St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, ">=", '>=', 2); scan1(">"=Cs, _St, Line, Col, Toks) -> {more,{Cs,Col,Toks,Line,[],fun scan/6}}; %% -> -- scan1("->"++Cs, St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, "->", '->', 2); scan1("--"++Cs, St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, "--", '--', 2); scan1("-"=Cs, _St, Line, Col, Toks) -> {more,{Cs,Col,Toks,Line,[],fun scan/6}}; %% ++ scan1("++"++Cs, St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, "++", '++', 2); scan1("+"=Cs, _St, Line, Col, Toks) -> {more,{Cs,Col,Toks,Line,[],fun scan/6}}; %% =:= =/= =< == => scan1("=:="++Cs, St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, "=:=", '=:=', 3); scan1("=:"=Cs, _St, Line, Col, Toks) -> {more,{Cs,Col,Toks,Line,[],fun scan/6}}; scan1("=/="++Cs, St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, "=/=", '=/=', 3); scan1("=/"=Cs, _St, Line, Col, Toks) -> {more,{Cs,Col,Toks,Line,[],fun scan/6}}; scan1("=<"++Cs, St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, "=<", '=<', 2); scan1("=>"++Cs, St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, "=>", '=>', 2); scan1("=="++Cs, St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, "==", '==', 2); scan1("="=Cs, _St, Line, Col, Toks) -> {more,{Cs,Col,Toks,Line,[],fun scan/6}}; %% /= scan1("/="++Cs, St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, "/=", '/=', 2); scan1("/"=Cs, _St, Line, Col, Toks) -> {more,{Cs,Col,Toks,Line,[],fun scan/6}}; %% || scan1("||"++Cs, St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, "||", '||', 2); scan1("|"=Cs, _St, Line, Col, Toks) -> {more,{Cs,Col,Toks,Line,[],fun scan/6}}; %% := scan1(":="++Cs, St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, ":=", ':=', 2); %% :: for typed records scan1("::"++Cs, St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, "::", '::', 2); scan1(":"=Cs, _St, Line, Col, Toks) -> {more,{Cs,Col,Toks,Line,[],fun scan/6}}; %% Optimization: punctuation characters less than 127: scan1([$=|Cs], St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, "=", '=', 1); scan1([$:|Cs], St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, ":", ':', 1); scan1([$||Cs], St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, "|", '|', 1); scan1([$#|Cs], St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, "#", '#', 1); scan1([$/|Cs], St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, "/", '/', 1); scan1([$?|Cs], St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, "?", '?', 1); scan1([$-|Cs], St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, "-", '-', 1); scan1([$+|Cs], St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, "+", '+', 1); scan1([$*|Cs], St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, "*", '*', 1); scan1([$<|Cs], St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, "<", '<', 1); scan1([$>|Cs], St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, ">", '>', 1); scan1([$!|Cs], St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, "!", '!', 1); scan1([$@|Cs], St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, "@", '@', 1); scan1([$\\|Cs], St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, "\\", '\\', 1); scan1([$^|Cs], St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, "^", '^', 1); scan1([$`|Cs], St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, "`", '`', 1); scan1([$~|Cs], St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, "~", '~', 1); scan1([$&|Cs], St, Line, Col, Toks) -> tok2(Cs, St, Line, Col, Toks, "&", '&', 1); %% End of optimization. scan1([C|Cs], St, Line, Col, Toks) when ?UNI255(C) -> Str = [C], tok2(Cs, St, Line, Col, Toks, Str, list_to_atom(Str), 1); scan1([C|Cs], _St, Line, Col, _Toks) when ?CHAR(C) -> Ncol = incr_column(Col, 1), scan_error({illegal,character}, Line, Col, Line, Ncol, Cs); scan1([]=Cs, _St, Line, Col, Toks) -> {more,{Cs,Col,Toks,Line,[],fun scan/6}}; scan1(eof=Cs, _St, Line, Col, Toks) -> {ok,Toks,Cs,Line,Col}. scan_atom(Cs0, St, Line, Col, Toks, Ncs0) -> case scan_name(Cs0, Ncs0) of {more,Ncs} -> {more,{[],Col,Toks,Line,Ncs,fun scan_atom/6}}; {Wcs,Cs} -> case catch list_to_atom(Wcs) of Name when is_atom(Name) -> case (St#erl_scan.resword_fun)(Name) of true -> tok2(Cs, St, Line, Col, Toks, Wcs, Name); false -> tok3(Cs, St, Line, Col, Toks, atom, Wcs, Name) end; _Error -> Ncol = incr_column(Col, length(Wcs)), scan_error({illegal,atom}, Line, Col, Line, Ncol, Cs) end end. scan_variable(Cs0, St, Line, Col, Toks, Ncs0) -> case scan_name(Cs0, Ncs0) of {more,Ncs} -> {more,{[],Col,Toks,Line,Ncs,fun scan_variable/6}}; {Wcs,Cs} -> case catch list_to_atom(Wcs) of Name when is_atom(Name) -> tok3(Cs, St, Line, Col, Toks, var, Wcs, Name); _Error -> Ncol = incr_column(Col, length(Wcs)), scan_error({illegal,var}, Line, Col, Line, Ncol, Cs) end end. scan_name([C|Cs], Ncs) when C >= $a, C =< $z -> scan_name(Cs, [C|Ncs]); scan_name([C|Cs], Ncs) when C >= $A, C =< $Z -> scan_name(Cs, [C|Ncs]); scan_name([$_=C|Cs], Ncs) -> scan_name(Cs, [C|Ncs]); scan_name([C|Cs], Ncs) when ?DIGIT(C) -> scan_name(Cs, [C|Ncs]); scan_name([$@=C|Cs], Ncs) -> scan_name(Cs, [C|Ncs]); scan_name([C|Cs], Ncs) when C >= $ß, C =< $ÿ, C =/= $÷ -> scan_name(Cs, [C|Ncs]); scan_name([C|Cs], Ncs) when C >= $À, C =< $Þ, C =/= $× -> scan_name(Cs, [C|Ncs]); scan_name([], Ncs) -> {more,Ncs}; scan_name(Cs, Ncs) -> {lists:reverse(Ncs),Cs}. -define(STR(St, S), if St#erl_scan.text -> S; true -> [] end). scan_dot([$%|_]=Cs, St, Line, Col, Toks, Ncs) -> Anno = anno(Line, Col, St, Ncs), {ok,[{dot,Anno}|Toks],Cs,Line,incr_column(Col, 1)}; scan_dot([$\n=C|Cs], St, Line, Col, Toks, Ncs) -> Anno = anno(Line, Col, St, ?STR(St, Ncs++[C])), {ok,[{dot,Anno}|Toks],Cs,Line+1,new_column(Col, 1)}; scan_dot([C|Cs], St, Line, Col, Toks, Ncs) when ?WHITE_SPACE(C) -> Anno = anno(Line, Col, St, ?STR(St, Ncs++[C])), {ok,[{dot,Anno}|Toks],Cs,Line,incr_column(Col, 2)}; scan_dot(eof=Cs, St, Line, Col, Toks, Ncs) -> Anno = anno(Line, Col, St, Ncs), {ok,[{dot,Anno}|Toks],Cs,Line,incr_column(Col, 1)}; scan_dot(Cs, St, Line, Col, Toks, Ncs) -> tok2(Cs, St, Line, Col, Toks, Ncs, '.', 1). %%% White space characters are very common, so it is worthwhile to %%% scan them fast and store them compactly. (The words "whitespace" %%% and "white space" usually mean the same thing. The Erlang %%% specification denotes the characters with ASCII code in the %%% interval 0 to 32 as "white space".) %%% %%% Convention: if there is a white newline ($\n) it will always be %%% the first character in the text string. As a consequence, there %%% cannot be more than one newline in a white_space token string. %%% %%% Some common combinations are recognized, some are not. Examples %%% of the latter are tab(s) followed by space(s), like "\t ". %%% (They will be represented by two (or more) tokens.) %%% %%% Note: the character sequence "\r\n" is *not* recognized since it %%% would violate the property that $\n will always be the first %%% character. (But since "\r\n\r\n" is common, it pays off to %%% recognize "\n\r".) scan_newline([$\s|Cs], St, Line, Col, Toks) -> scan_nl_spcs(Cs, St, Line, Col, Toks, 2); scan_newline([$\t|Cs], St, Line, Col, Toks) -> scan_nl_tabs(Cs, St, Line, Col, Toks, 2); scan_newline([$\r|Cs], St, Line, Col, Toks) -> newline_end(Cs, St, Line, Col, Toks, 2, "\n\r"); scan_newline([$\f|Cs], St, Line, Col, Toks) -> newline_end(Cs, St, Line, Col, Toks, 2, "\n\f"); scan_newline([], _St, Line, Col, Toks) -> {more,{[$\n],Col,Toks,Line,[],fun scan/6}}; scan_newline(Cs, St, Line, Col, Toks) -> scan_nl_white_space(Cs, St, Line, Col, Toks, "\n"). scan_nl_spcs([$\s|Cs], St, Line, Col, Toks, N) when N < 17 -> scan_nl_spcs(Cs, St, Line, Col, Toks, N+1); scan_nl_spcs([]=Cs, _St, Line, Col, Toks, N) -> {more,{Cs,Col,Toks,Line,N,fun scan_nl_spcs/6}}; scan_nl_spcs(Cs, St, Line, Col, Toks, N) -> newline_end(Cs, St, Line, Col, Toks, N, nl_spcs(N)). scan_nl_tabs([$\t|Cs], St, Line, Col, Toks, N) when N < 11 -> scan_nl_tabs(Cs, St, Line, Col, Toks, N+1); scan_nl_tabs([]=Cs, _St, Line, Col, Toks, N) -> {more,{Cs,Col,Toks,Line,N,fun scan_nl_tabs/6}}; scan_nl_tabs(Cs, St, Line, Col, Toks, N) -> newline_end(Cs, St, Line, Col, Toks, N, nl_tabs(N)). %% Note: returning {more,Cont} is meaningless here; one could just as %% well return several tokens. But since tokens() scans up to a full %% stop anyway, nothing is gained by not collecting all white spaces. scan_nl_white_space([$\n|Cs], #erl_scan{text = false}=St, Line, no_col=Col, Toks0, Ncs) -> Toks = [{white_space,anno(Line),lists:reverse(Ncs)}|Toks0], scan_newline(Cs, St, Line+1, Col, Toks); scan_nl_white_space([$\n|Cs], St, Line, Col, Toks, Ncs0) -> Ncs = lists:reverse(Ncs0), Anno = anno(Line, Col, St, Ncs), Token = {white_space,Anno,Ncs}, scan_newline(Cs, St, Line+1, new_column(Col, length(Ncs)), [Token|Toks]); scan_nl_white_space([C|Cs], St, Line, Col, Toks, Ncs) when ?WHITE_SPACE(C) -> scan_nl_white_space(Cs, St, Line, Col, Toks, [C|Ncs]); scan_nl_white_space([]=Cs, _St, Line, Col, Toks, Ncs) -> {more,{Cs,Col,Toks,Line,Ncs,fun scan_nl_white_space/6}}; scan_nl_white_space(Cs, #erl_scan{text = false}=St, Line, no_col=Col, Toks, Ncs) -> Anno = anno(Line), scan1(Cs, St, Line+1, Col, [{white_space,Anno,lists:reverse(Ncs)}|Toks]); scan_nl_white_space(Cs, St, Line, Col, Toks, Ncs0) -> Ncs = lists:reverse(Ncs0), Anno = anno(Line, Col, St, Ncs), Token = {white_space,Anno,Ncs}, scan1(Cs, St, Line+1, new_column(Col, length(Ncs)), [Token|Toks]). newline_end(Cs, #erl_scan{text = false}=St, Line, no_col=Col, Toks, _N, Ncs) -> scan1(Cs, St, Line+1, Col, [{white_space,anno(Line),Ncs}|Toks]); newline_end(Cs, St, Line, Col, Toks, N, Ncs) -> Anno = anno(Line, Col, St, Ncs), scan1(Cs, St, Line+1, new_column(Col, N), [{white_space,Anno,Ncs}|Toks]). scan_spcs([$\s|Cs], St, Line, Col, Toks, N) when N < 16 -> scan_spcs(Cs, St, Line, Col, Toks, N+1); scan_spcs([]=Cs, _St, Line, Col, Toks, N) -> {more,{Cs,Col,Toks,Line,N,fun scan_spcs/6}}; scan_spcs(Cs, St, Line, Col, Toks, N) -> white_space_end(Cs, St, Line, Col, Toks, N, spcs(N)). scan_tabs([$\t|Cs], St, Line, Col, Toks, N) when N < 10 -> scan_tabs(Cs, St, Line, Col, Toks, N+1); scan_tabs([]=Cs, _St, Line, Col, Toks, N) -> {more,{Cs,Col,Toks,Line,N,fun scan_tabs/6}}; scan_tabs(Cs, St, Line, Col, Toks, N) -> white_space_end(Cs, St, Line, Col, Toks, N, tabs(N)). skip_white_space([$\n|Cs], St, Line, Col, Toks, _N) -> skip_white_space(Cs, St, Line+1, new_column(Col, 1), Toks, 0); skip_white_space([C|Cs], St, Line, Col, Toks, N) when ?WHITE_SPACE(C) -> skip_white_space(Cs, St, Line, Col, Toks, N+1); skip_white_space([]=Cs, _St, Line, Col, Toks, N) -> {more,{Cs,Col,Toks,Line,N,fun skip_white_space/6}}; skip_white_space(Cs, St, Line, Col, Toks, N) -> scan1(Cs, St, Line, incr_column(Col, N), Toks). %% Maybe \t and \s should break the loop. scan_white_space([$\n|_]=Cs, St, Line, Col, Toks, Ncs) -> white_space_end(Cs, St, Line, Col, Toks, length(Ncs), lists:reverse(Ncs)); scan_white_space([C|Cs], St, Line, Col, Toks, Ncs) when ?WHITE_SPACE(C) -> scan_white_space(Cs, St, Line, Col, Toks, [C|Ncs]); scan_white_space([]=Cs, _St, Line, Col, Toks, Ncs) -> {more,{Cs,Col,Toks,Line,Ncs,fun scan_white_space/6}}; scan_white_space(Cs, St, Line, Col, Toks, Ncs) -> white_space_end(Cs, St, Line, Col, Toks, length(Ncs), lists:reverse(Ncs)). -compile({inline,[white_space_end/7]}). white_space_end(Cs, St, Line, Col, Toks, N, Ncs) -> tok3(Cs, St, Line, Col, Toks, white_space, Ncs, Ncs, N). scan_char([$\\|Cs]=Cs0, St, Line, Col, Toks) -> case scan_escape(Cs, incr_column(Col, 2)) of more -> {more,{[$$|Cs0],Col,Toks,Line,[],fun scan/6}}; {error,Ncs,Error,Ncol} -> scan_error(Error, Line, Col, Line, Ncol, Ncs); {eof,Ncol} -> scan_error(char, Line, Col, Line, Ncol, eof); {nl,Val,Str,Ncs,Ncol} -> Anno = anno(Line, Col, St, ?STR(St, "$\\"++Str)), %" Ntoks = [{char,Anno,Val}|Toks], scan1(Ncs, St, Line+1, Ncol, Ntoks); {Val,Str,Ncs,Ncol} -> Anno = anno(Line, Col, St, ?STR(St, "$\\"++Str)), %" Ntoks = [{char,Anno,Val}|Toks], scan1(Ncs, St, Line, Ncol, Ntoks) end; scan_char([$\n=C|Cs], St, Line, Col, Toks) -> Anno = anno(Line, Col, St, ?STR(St, [$$,C])), scan1(Cs, St, Line+1, new_column(Col, 1), [{char,Anno,C}|Toks]); scan_char([C|Cs], St, Line, Col, Toks) when ?UNICODE(C) -> Anno = anno(Line, Col, St, ?STR(St, [$$,C])), scan1(Cs, St, Line, incr_column(Col, 2), [{char,Anno,C}|Toks]); scan_char([C|_Cs], _St, Line, Col, _Toks) when ?CHAR(C) -> scan_error({illegal,character}, Line, Col, Line, incr_column(Col, 1), eof); scan_char([], _St, Line, Col, Toks) -> {more,{[$$],Col,Toks,Line,[],fun scan/6}}; scan_char(eof, _St, Line, Col, _Toks) -> scan_error(char, Line, Col, Line, incr_column(Col, 1), eof). scan_string(Cs, St, Line, Col, Toks, {Wcs,Str,Line0,Col0}) -> case scan_string0(Cs, St, Line, Col, $\", Str, Wcs) of %" {more,Ncs,Nline,Ncol,Nstr,Nwcs} -> State = {Nwcs,Nstr,Line0,Col0}, {more,{Ncs,Ncol,Toks,Nline,State,fun scan_string/6}}; {char_error,Ncs,Error,Nline,Ncol,EndCol} -> scan_error(Error, Nline, Ncol, Nline, EndCol, Ncs); {error,Nline,Ncol,Nwcs,Ncs} -> Estr = string:slice(Nwcs, 0, 16), % Expanded escape chars. scan_error({string,$\",Estr}, Line0, Col0, Nline, Ncol, Ncs); %" {Ncs,Nline,Ncol,Nstr,Nwcs} -> Anno = anno(Line0, Col0, St, Nstr), scan1(Ncs, St, Nline, Ncol, [{string,Anno,Nwcs}|Toks]) end. scan_qatom(Cs, St, Line, Col, Toks, {Wcs,Str,Line0,Col0}) -> case scan_string0(Cs, St, Line, Col, $\', Str, Wcs) of %' {more,Ncs,Nline,Ncol,Nstr,Nwcs} -> State = {Nwcs,Nstr,Line0,Col0}, {more,{Ncs,Ncol,Toks,Nline,State,fun scan_qatom/6}}; {char_error,Ncs,Error,Nline,Ncol,EndCol} -> scan_error(Error, Nline, Ncol, Nline, EndCol, Ncs); {error,Nline,Ncol,Nwcs,Ncs} -> Estr = string:slice(Nwcs, 0, 16), % Expanded escape chars. scan_error({string,$\',Estr}, Line0, Col0, Nline, Ncol, Ncs); %' {Ncs,Nline,Ncol,Nstr,Nwcs} -> case catch list_to_atom(Nwcs) of A when is_atom(A) -> Anno = anno(Line0, Col0, St, Nstr), scan1(Ncs, St, Nline, Ncol, [{atom,Anno,A}|Toks]); _ -> scan_error({illegal,atom}, Line0, Col0, Nline, Ncol, Ncs) end end. scan_string0(Cs, #erl_scan{text=false}, Line, no_col=Col, Q, [], Wcs) -> scan_string_no_col(Cs, Line, Col, Q, Wcs); scan_string0(Cs, #erl_scan{text=true}, Line, no_col=Col, Q, Str, Wcs) -> scan_string1(Cs, Line, Col, Q, Str, Wcs); scan_string0(Cs, St, Line, Col, Q, [], Wcs) -> scan_string_col(Cs, St, Line, Col, Q, Wcs); scan_string0(Cs, _St, Line, Col, Q, Str, Wcs) -> scan_string1(Cs, Line, Col, Q, Str, Wcs). %% Optimization. Col =:= no_col. scan_string_no_col([Q|Cs], Line, Col, Q, Wcs) -> {Cs,Line,Col,_DontCare=[],lists:reverse(Wcs)}; scan_string_no_col([$\n=C|Cs], Line, Col, Q, Wcs) -> scan_string_no_col(Cs, Line+1, Col, Q, [C|Wcs]); scan_string_no_col([C|Cs], Line, Col, Q, Wcs) when C =/= $\\, ?UNICODE(C) -> scan_string_no_col(Cs, Line, Col, Q, [C|Wcs]); scan_string_no_col(Cs, Line, Col, Q, Wcs) -> scan_string1(Cs, Line, Col, Q, Wcs, Wcs). %% Optimization. Col =/= no_col. scan_string_col([Q|Cs], St, Line, Col, Q, Wcs0) -> Wcs = lists:reverse(Wcs0), Str = ?STR(St, [Q|Wcs++[Q]]), {Cs,Line,Col+1,Str,Wcs}; scan_string_col([$\n=C|Cs], St, Line, _xCol, Q, Wcs) -> scan_string_col(Cs, St, Line+1, 1, Q, [C|Wcs]); scan_string_col([C|Cs], St, Line, Col, Q, Wcs) when C =/= $\\, ?UNICODE(C) -> scan_string_col(Cs, St, Line, Col+1, Q, [C|Wcs]); scan_string_col(Cs, _St, Line, Col, Q, Wcs) -> scan_string1(Cs, Line, Col, Q, Wcs, Wcs). %% Note: in those cases when a 'char_error' tuple is returned below it %% is tempting to skip over characters up to the first Q character, %% but then the end location of the error tuple would not correspond %% to the start location of the returned Rest string. (Maybe the end %% location could be modified, but that too is ugly.) scan_string1([Q|Cs], Line, Col, Q, Str0, Wcs0) -> Wcs = lists:reverse(Wcs0), Str = [Q|lists:reverse(Str0, [Q])], {Cs,Line,incr_column(Col, 1),Str,Wcs}; scan_string1([$\n=C|Cs], Line, Col, Q, Str, Wcs) -> Ncol = new_column(Col, 1), scan_string1(Cs, Line+1, Ncol, Q, [C|Str], [C|Wcs]); scan_string1([$\\|Cs]=Cs0, Line, Col, Q, Str, Wcs) -> case scan_escape(Cs, Col) of more -> {more,Cs0,Line,Col,Str,Wcs}; {error,Ncs,Error,Ncol} -> {char_error,Ncs,Error,Line,Col,incr_column(Ncol, 1)}; {eof,Ncol} -> {error,Line,incr_column(Ncol, 1),lists:reverse(Wcs),eof}; {nl,Val,ValStr,Ncs,Ncol} -> Nstr = lists:reverse(ValStr, [$\\|Str]), Nwcs = [Val|Wcs], scan_string1(Ncs, Line+1, Ncol, Q, Nstr, Nwcs); {Val,ValStr,Ncs,Ncol} -> Nstr = lists:reverse(ValStr, [$\\|Str]), Nwcs = [Val|Wcs], scan_string1(Ncs, Line, incr_column(Ncol, 1), Q, Nstr, Nwcs) end; scan_string1([C|Cs], Line, no_col=Col, Q, Str, Wcs) when ?UNICODE(C) -> scan_string1(Cs, Line, Col, Q, [C|Str], [C|Wcs]); scan_string1([C|Cs], Line, Col, Q, Str, Wcs) when ?UNICODE(C) -> scan_string1(Cs, Line, Col+1, Q, [C|Str], [C|Wcs]); scan_string1([C|Cs], Line, Col, _Q, _Str, _Wcs) when ?CHAR(C) -> {char_error,Cs,{illegal,character},Line,Col,incr_column(Col, 1)}; scan_string1([]=Cs, Line, Col, _Q, Str, Wcs) -> {more,Cs,Line,Col,Str,Wcs}; scan_string1(eof, Line, Col, _Q, _Str, Wcs) -> {error,Line,Col,lists:reverse(Wcs),eof}. -define(OCT(C), C >= $0, C =< $7). -define(HEX(C), C >= $0 andalso C =< $9 orelse C >= $A andalso C =< $F orelse C >= $a andalso C =< $f). %% \<1-3> octal digits scan_escape([O1,O2,O3|Cs], Col) when ?OCT(O1), ?OCT(O2), ?OCT(O3) -> Val = (O1*8 + O2)*8 + O3 - 73*$0, {Val,[O1,O2,O3],Cs,incr_column(Col, 3)}; scan_escape([O1,O2], _Col) when ?OCT(O1), ?OCT(O2) -> more; scan_escape([O1,O2|Cs], Col) when ?OCT(O1), ?OCT(O2) -> Val = (O1*8 + O2) - 9*$0, {Val,[O1,O2],Cs,incr_column(Col, 2)}; scan_escape([O1], _Col) when ?OCT(O1) -> more; scan_escape([O1|Cs], Col) when ?OCT(O1) -> {O1 - $0,[O1],Cs,incr_column(Col, 1)}; %% \x{<hex digits>} scan_escape([$x,${|Cs], Col) -> scan_hex(Cs, incr_column(Col, 2), []); scan_escape([$x], _Col) -> more; scan_escape([$x|eof], Col) -> {eof,incr_column(Col, 1)}; %% \x<2> hexadecimal digits scan_escape([$x,H1,H2|Cs], Col) when ?HEX(H1), ?HEX(H2) -> Val = erlang:list_to_integer([H1,H2], 16), {Val,[$x,H1,H2],Cs,incr_column(Col, 3)}; scan_escape([$x,H1], _Col) when ?HEX(H1) -> more; scan_escape([$x|Cs], Col) -> {error,Cs,{illegal,character},incr_column(Col, 1)}; %% \^X -> CTL-X scan_escape([$^=C0,$\n=C|Cs], Col) -> {nl,C,[C0,C],Cs,new_column(Col, 1)}; scan_escape([$^=C0,C|Cs], Col) when ?CHAR(C) -> Val = C band 31, {Val,[C0,C],Cs,incr_column(Col, 2)}; scan_escape([$^], _Col) -> more; scan_escape([$^|eof], Col) -> {eof,incr_column(Col, 1)}; scan_escape([$\n=C|Cs], Col) -> {nl,C,[C],Cs,new_column(Col, 1)}; scan_escape([C0|Cs], Col) when ?UNICODE(C0) -> C = escape_char(C0), {C,[C0],Cs,incr_column(Col, 1)}; scan_escape([C|Cs], Col) when ?CHAR(C) -> {error,Cs,{illegal,character},incr_column(Col, 1)}; scan_escape([], _Col) -> more; scan_escape(eof, Col) -> {eof,Col}. scan_hex([C|Cs], no_col=Col, Wcs) when ?HEX(C) -> scan_hex(Cs, Col, [C|Wcs]); scan_hex([C|Cs], Col, Wcs) when ?HEX(C) -> scan_hex(Cs, Col+1, [C|Wcs]); scan_hex(Cs, Col, Wcs) -> scan_esc_end(Cs, Col, Wcs, 16, "x{"). scan_esc_end([$}|Cs], Col, Wcs0, B, Str0) -> Wcs = lists:reverse(Wcs0), case catch erlang:list_to_integer(Wcs, B) of Val when ?UNICODE(Val) -> {Val,Str0++Wcs++[$}],Cs,incr_column(Col, 1)}; _ -> {error,Cs,{illegal,character},incr_column(Col, 1)} end; scan_esc_end([], _Col, _Wcs, _B, _Str0) -> more; scan_esc_end(eof, Col, _Wcs, _B, _Str0) -> {eof,Col}; scan_esc_end(Cs, Col, _Wcs, _B, _Str0) -> {error,Cs,{illegal,character},Col}. escape_char($n) -> $\n; % \n = LF escape_char($r) -> $\r; % \r = CR escape_char($t) -> $\t; % \t = TAB escape_char($v) -> $\v; % \v = VT escape_char($b) -> $\b; % \b = BS escape_char($f) -> $\f; % \f = FF escape_char($e) -> $\e; % \e = ESC escape_char($s) -> $\s; % \s = SPC escape_char($d) -> $\d; % \d = DEL escape_char(C) -> C. scan_number([C|Cs], St, Line, Col, Toks, Ncs) when ?DIGIT(C) -> scan_number(Cs, St, Line, Col, Toks, [C|Ncs]); scan_number([$.,C|Cs], St, Line, Col, Toks, Ncs) when ?DIGIT(C) -> scan_fraction(Cs, St, Line, Col, Toks, [C,$.|Ncs]); scan_number([$.]=Cs, _St, Line, Col, Toks, Ncs) -> {more,{Cs,Col,Toks,Line,Ncs,fun scan_number/6}}; scan_number([$#|Cs]=Cs0, St, Line, Col, Toks, Ncs0) -> Ncs = lists:reverse(Ncs0), case catch list_to_integer(Ncs) of B when B >= 2, B =< 1+$Z-$A+10 -> Bcs = Ncs++[$#], scan_based_int(Cs, St, Line, Col, Toks, {B,[],Bcs}); B -> Len = length(Ncs), scan_error({base,B}, Line, Col, Line, incr_column(Col, Len), Cs0) end; scan_number([]=Cs, _St, Line, Col, Toks, Ncs) -> {more,{Cs,Col,Toks,Line,Ncs,fun scan_number/6}}; scan_number(Cs, St, Line, Col, Toks, Ncs0) -> Ncs = lists:reverse(Ncs0), case catch list_to_integer(Ncs) of N when is_integer(N) -> tok3(Cs, St, Line, Col, Toks, integer, Ncs, N); _ -> Ncol = incr_column(Col, length(Ncs)), scan_error({illegal,integer}, Line, Col, Line, Ncol, Cs) end. scan_based_int([C|Cs], St, Line, Col, Toks, {B,Ncs,Bcs}) when ?DIGIT(C), C < $0+B -> scan_based_int(Cs, St, Line, Col, Toks, {B,[C|Ncs],Bcs}); scan_based_int([C|Cs], St, Line, Col, Toks, {B,Ncs,Bcs}) when C >= $A, B > 10, C < $A+B-10 -> scan_based_int(Cs, St, Line, Col, Toks, {B,[C|Ncs],Bcs}); scan_based_int([C|Cs], St, Line, Col, Toks, {B,Ncs,Bcs}) when C >= $a, B > 10, C < $a+B-10 -> scan_based_int(Cs, St, Line, Col, Toks, {B,[C|Ncs],Bcs}); scan_based_int([]=Cs, _St, Line, Col, Toks, State) -> {more,{Cs,Col,Toks,Line,State,fun scan_based_int/6}}; scan_based_int(Cs, St, Line, Col, Toks, {B,Ncs0,Bcs}) -> Ncs = lists:reverse(Ncs0), case catch erlang:list_to_integer(Ncs, B) of N when is_integer(N) -> tok3(Cs, St, Line, Col, Toks, integer, Bcs++Ncs, N); _ -> Len = length(Bcs)+length(Ncs), Ncol = incr_column(Col, Len), scan_error({illegal,integer}, Line, Col, Line, Ncol, Cs) end. scan_fraction([C|Cs], St, Line, Col, Toks, Ncs) when ?DIGIT(C) -> scan_fraction(Cs, St, Line, Col, Toks, [C|Ncs]); scan_fraction([E|Cs], St, Line, Col, Toks, Ncs) when E =:= $e; E =:= $E -> scan_exponent_sign(Cs, St, Line, Col, Toks, [E|Ncs]); scan_fraction([]=Cs, _St, Line, Col, Toks, Ncs) -> {more,{Cs,Col,Toks,Line,Ncs,fun scan_fraction/6}}; scan_fraction(Cs, St, Line, Col, Toks, Ncs) -> float_end(Cs, St, Line, Col, Toks, Ncs). scan_exponent_sign([C|Cs], St, Line, Col, Toks, Ncs) when C =:= $+; C =:= $- -> scan_exponent(Cs, St, Line, Col, Toks, [C|Ncs]); scan_exponent_sign([]=Cs, _St, Line, Col, Toks, Ncs) -> {more,{Cs,Col,Toks,Line,Ncs,fun scan_exponent_sign/6}}; scan_exponent_sign(Cs, St, Line, Col, Toks, Ncs) -> scan_exponent(Cs, St, Line, Col, Toks, Ncs). scan_exponent([C|Cs], St, Line, Col, Toks, Ncs) when ?DIGIT(C) -> scan_exponent(Cs, St, Line, Col, Toks, [C|Ncs]); scan_exponent([]=Cs, _St, Line, Col, Toks, Ncs) -> {more,{Cs,Col,Toks,Line,Ncs,fun scan_exponent/6}}; scan_exponent(Cs, St, Line, Col, Toks, Ncs) -> float_end(Cs, St, Line, Col, Toks, Ncs). float_end(Cs, St, Line, Col, Toks, Ncs0) -> Ncs = lists:reverse(Ncs0), case catch list_to_float(Ncs) of F when is_float(F) -> tok3(Cs, St, Line, Col, Toks, float, Ncs, F); _ -> Ncol = incr_column(Col, length(Ncs)), scan_error({illegal,float}, Line, Col, Line, Ncol, Cs) end. skip_comment([C|Cs], St, Line, Col, Toks, N) when C =/= $\n, ?CHAR(C) -> case ?UNICODE(C) of true -> skip_comment(Cs, St, Line, Col, Toks, N+1); false -> Ncol = incr_column(Col, N+1), scan_error({illegal,character}, Line, Col, Line, Ncol, Cs) end; skip_comment([]=Cs, _St, Line, Col, Toks, N) -> {more,{Cs,Col,Toks,Line,N,fun skip_comment/6}}; skip_comment(Cs, St, Line, Col, Toks, N) -> scan1(Cs, St, Line, incr_column(Col, N), Toks). scan_comment([C|Cs], St, Line, Col, Toks, Ncs) when C =/= $\n, ?CHAR(C) -> case ?UNICODE(C) of true -> scan_comment(Cs, St, Line, Col, Toks, [C|Ncs]); false -> Ncol = incr_column(Col, length(Ncs)+1), scan_error({illegal,character}, Line, Col, Line, Ncol, Cs) end; scan_comment([]=Cs, _St, Line, Col, Toks, Ncs) -> {more,{Cs,Col,Toks,Line,Ncs,fun scan_comment/6}}; scan_comment(Cs, St, Line, Col, Toks, Ncs0) -> Ncs = lists:reverse(Ncs0), tok3(Cs, St, Line, Col, Toks, comment, Ncs, Ncs). tok2(Cs, #erl_scan{text = false}=St, Line, no_col=Col, Toks, _Wcs, P) -> scan1(Cs, St, Line, Col, [{P,anno(Line)}|Toks]); tok2(Cs, St, Line, Col, Toks, Wcs, P) -> Anno = anno(Line, Col, St, Wcs), scan1(Cs, St, Line, incr_column(Col, length(Wcs)), [{P,Anno}|Toks]). tok2(Cs, #erl_scan{text = false}=St, Line, no_col=Col, Toks, _Wcs, P, _N) -> scan1(Cs, St, Line, Col, [{P,anno(Line)}|Toks]); tok2(Cs, St, Line, Col, Toks, Wcs, P, N) -> Anno = anno(Line, Col, St, Wcs), scan1(Cs, St, Line, incr_column(Col, N), [{P,Anno}|Toks]). tok3(Cs, #erl_scan{text = false}=St, Line, no_col=Col, Toks, Item, _S, Sym) -> scan1(Cs, St, Line, Col, [{Item,anno(Line),Sym}|Toks]); tok3(Cs, St, Line, Col, Toks, Item, String, Sym) -> Token = {Item,anno(Line, Col, St, String),Sym}, scan1(Cs, St, Line, incr_column(Col, length(String)), [Token|Toks]). tok3(Cs, #erl_scan{text = false}=St, Line, no_col=Col, Toks, Item, _String, Sym, _Length) -> scan1(Cs, St, Line, Col, [{Item,anno(Line),Sym}|Toks]); tok3(Cs, St, Line, Col, Toks, Item, String, Sym, Length) -> Token = {Item,anno(Line, Col, St, String),Sym}, scan1(Cs, St, Line, incr_column(Col, Length), [Token|Toks]). scan_error(Error, Line, Col, EndLine, EndCol, Rest) -> Loc = location(Line, Col), EndLoc = location(EndLine, EndCol), scan_error(Error, Loc, EndLoc, Rest). scan_error(Error, ErrorLoc, EndLoc, Rest) -> {{error,{ErrorLoc,?MODULE,Error},EndLoc},Rest}. -compile({inline,[anno/4]}). anno(Line, no_col, #erl_scan{text = false}, _String) -> anno(Line); anno(Line, no_col, #erl_scan{text = true}, String) -> Anno = anno(Line), erl_anno:set_text(String, Anno); anno(Line, Col, #erl_scan{text = false}, _String) -> anno({Line, Col}); anno(Line, Col, #erl_scan{text = true}, String) -> Anno = anno({Line, Col}), erl_anno:set_text(String, Anno). location(Line, no_col) -> Line; location(Line, Col) when is_integer(Col) -> {Line,Col}. -compile({inline,[anno/1,incr_column/2,new_column/2]}). anno(Location) -> erl_anno:new(Location). incr_column(no_col=Col, _N) -> Col; incr_column(Col, N) when is_integer(Col) -> Col + N. new_column(no_col=Col, _Ncol) -> Col; new_column(Col, Ncol) when is_integer(Col) -> Ncol. nl_spcs(2) -> "\n "; nl_spcs(3) -> "\n "; nl_spcs(4) -> "\n "; nl_spcs(5) -> "\n "; nl_spcs(6) -> "\n "; nl_spcs(7) -> "\n "; nl_spcs(8) -> "\n "; nl_spcs(9) -> "\n "; nl_spcs(10) -> "\n "; nl_spcs(11) -> "\n "; nl_spcs(12) -> "\n "; nl_spcs(13) -> "\n "; nl_spcs(14) -> "\n "; nl_spcs(15) -> "\n "; nl_spcs(16) -> "\n "; nl_spcs(17) -> "\n ". spcs(1) -> " "; spcs(2) -> " "; spcs(3) -> " "; spcs(4) -> " "; spcs(5) -> " "; spcs(6) -> " "; spcs(7) -> " "; spcs(8) -> " "; spcs(9) -> " "; spcs(10) -> " "; spcs(11) -> " "; spcs(12) -> " "; spcs(13) -> " "; spcs(14) -> " "; spcs(15) -> " "; spcs(16) -> " ". nl_tabs(2) -> "\n\t"; nl_tabs(3) -> "\n\t\t"; nl_tabs(4) -> "\n\t\t\t"; nl_tabs(5) -> "\n\t\t\t\t"; nl_tabs(6) -> "\n\t\t\t\t\t"; nl_tabs(7) -> "\n\t\t\t\t\t\t"; nl_tabs(8) -> "\n\t\t\t\t\t\t\t"; nl_tabs(9) -> "\n\t\t\t\t\t\t\t\t"; nl_tabs(10) -> "\n\t\t\t\t\t\t\t\t\t"; nl_tabs(11) -> "\n\t\t\t\t\t\t\t\t\t\t". tabs(1) -> "\t"; tabs(2) -> "\t\t"; tabs(3) -> "\t\t\t"; tabs(4) -> "\t\t\t\t"; tabs(5) -> "\t\t\t\t\t"; tabs(6) -> "\t\t\t\t\t\t"; tabs(7) -> "\t\t\t\t\t\t\t"; tabs(8) -> "\t\t\t\t\t\t\t\t"; tabs(9) -> "\t\t\t\t\t\t\t\t\t"; tabs(10) -> "\t\t\t\t\t\t\t\t\t\t". -spec reserved_word(Atom :: atom()) -> boolean(). reserved_word('after') -> true; reserved_word('begin') -> true; reserved_word('case') -> true; reserved_word('try') -> true; reserved_word('cond') -> true; reserved_word('catch') -> true; reserved_word('andalso') -> true; reserved_word('orelse') -> true; reserved_word('end') -> true; reserved_word('fun') -> true; reserved_word('if') -> true; reserved_word('let') -> true; reserved_word('of') -> true; reserved_word('receive') -> true; reserved_word('when') -> true; reserved_word('bnot') -> true; reserved_word('not') -> true; reserved_word('div') -> true; reserved_word('rem') -> true; reserved_word('band') -> true; reserved_word('and') -> true; reserved_word('bor') -> true; reserved_word('bxor') -> true; reserved_word('bsl') -> true; reserved_word('bsr') -> true; reserved_word('or') -> true; reserved_word('xor') -> true; reserved_word(_) -> false.