diff options
Diffstat (limited to 'lib/stdlib/src/epp.erl')
| -rw-r--r-- | lib/stdlib/src/epp.erl | 211 |
1 files changed, 194 insertions, 17 deletions
diff --git a/lib/stdlib/src/epp.erl b/lib/stdlib/src/epp.erl index 2c8d84a9e1..a0f7660ecf 100644 --- a/lib/stdlib/src/epp.erl +++ b/lib/stdlib/src/epp.erl @@ -23,13 +23,18 @@ -export([open/2,open/3,open/5,close/1,format_error/1]). -export([scan_erl_form/1,parse_erl_form/1,macro_defs/1]). -export([parse_file/1, parse_file/3]). +-export([default_encoding/0, encoding_to_string/1, + read_encoding/1, read_encoding/2, set_encoding/1]). -export([interpret_file_attribute/1]). -export([normalize_typed_record_fields/1,restore_typed_record_fields/1]). %%------------------------------------------------------------------------ +-export_type([source_encoding/0]). + -type macros() :: [{atom(), term()}]. -type epp_handle() :: pid(). +-type source_encoding() :: latin1 | utf8. %% Epp state record. -record(epp, {file, %Current file @@ -213,6 +218,173 @@ parse_file(Epp) -> [{eof,Location}] end. +-define(DEFAULT_ENCODING, latin1). + +-spec default_encoding() -> source_encoding(). + +default_encoding() -> + ?DEFAULT_ENCODING. + +-spec encoding_to_string(Encoding) -> string() when + Encoding :: source_encoding(). + +encoding_to_string(latin1) -> "coding: latin-1"; +encoding_to_string(utf8) -> "coding: utf-8". + +-spec read_encoding(FileName) -> source_encoding() | none when + FileName :: file:name(). + +read_encoding(Name) -> + read_encoding(Name, []). + +-spec read_encoding(FileName, Options) -> source_encoding() | none when + FileName :: file:name(), + Options :: [Option], + Option :: {in_comment_only, boolean()}. + +read_encoding(Name, Options) -> + InComment = proplists:get_value(in_comment_only, Options, true), + case file:open(Name, [read]) of + {ok,File} -> + try read_encoding_from_file(File, InComment) + after ok = file:close(File) + end; + _Error -> + none + end. + +-spec set_encoding(File) -> source_encoding() | none when + File :: io:device(). % pid(); raw files don't work + +set_encoding(File) -> + Encoding = read_encoding_from_file(File, true), + Enc = case Encoding of + none -> default_encoding(); + Encoding -> Encoding + end, + ok = io:setopts(File, [{encoding, Enc}]), + Encoding. + +-spec read_encoding_from_file(File, InComment) -> source_encoding() | none when + File :: io:device(), + InComment :: boolean(). + +-define(ENC_CHUNK, 32). +-define(N_ENC_CHUNK, 16). % a total of 512 bytes + +read_encoding_from_file(File, InComment) -> + {ok, Pos0} = file:position(File, cur), + Opts = io:getopts(File), + Encoding0 = lists:keyfind(encoding, 1, Opts), + Binary0 = lists:keyfind(binary, 1, Opts), + ok = io:setopts(File, [binary, {encoding, latin1}]), + try + {B, Fun} = (reader(File, 0))(), + com_nl(B, Fun, 0, InComment) + catch + throw:no -> + none + after + {ok, Pos0} = file:position(File, Pos0), + ok = io:setopts(File, [Binary0, Encoding0]) + end. + +reader(Fd, N) -> + fun() when N =:= ?N_ENC_CHUNK -> + throw(no); + () -> + case file:read(Fd, ?ENC_CHUNK) of + eof -> + {<<>>, reader(Fd, N+1)}; + {ok, Bin} -> + {Bin, reader(Fd, N+1)}; + {error, _} -> + throw(no) % ignore errors + end + end. + +com_nl(_, _, 2, _) -> + throw(no); +com_nl(B, Fun, N, false=Com) -> + com_c(B, Fun, N, Com); +com_nl(B, Fun, N, true=Com) -> + com(B, Fun, N, Com). + +com(<<"\n",B/binary>>, Fun, N, Com) -> + com_nl(B, Fun, N+1, Com); +com(<<"%", B/binary>>, Fun, N, Com) -> + com_c(B, Fun, N, Com); +com(<<_:1/unit:8,B/binary>>, Fun, N, Com) -> + com(B, Fun, N, Com); +com(<<>>, Fun, N, Com) -> + {B, Fun1} = Fun(), + com(B, Fun1, N, Com). + +com_c(<<"c",B/binary>>, Fun, N, Com) -> + com_oding(B, Fun, N, Com); +com_c(<<"\n",B/binary>>, Fun, N, Com) -> + com_nl(B, Fun, N+1, Com); +com_c(<<_:1/unit:8,B/binary>>, Fun, N, Com) -> + com_c(B, Fun, N, Com); +com_c(<<>>, Fun, N, Com) -> + {B, Fun1} = Fun(), + com_c(B, Fun1, N, Com). + +com_oding(<<"oding",B/binary>>, Fun, N, Com) -> + com_sep(B, Fun, N, Com); +com_oding(B, Fun, N, Com) when byte_size(B) >= length("oding") -> + com_c(B, Fun, N, Com); +com_oding(B, Fun, N, Com) -> + {B1, Fun1} = Fun(), + com_oding(list_to_binary([B, B1]), Fun1, N, Com). + +com_sep(<<":",B/binary>>, Fun, N, Com) -> + com_space(B, Fun, N, Com); +com_sep(<<"=",B/binary>>, Fun, N, Com) -> + com_space(B, Fun, N, Com); +com_sep(<<"\s",B/binary>>, Fun, N, Com) -> + com_sep(B, Fun, N, Com); +com_sep(<<>>, Fun, N, Com) -> + {B, Fun1} = Fun(), + com_sep(B, Fun1, N, Com); +com_sep(B, Fun, N, Com) -> + com_c(B, Fun, N, Com). + +com_space(<<"\s",B/binary>>, Fun, N, Com) -> + com_space(B, Fun, N, Com); +com_space(<<>>, Fun, N, Com) -> + {B, Fun1} = Fun(), + com_space(B, Fun1, N, Com); +com_space(B, Fun, N, _Com) -> + com_enc(B, Fun, N, [], []). + +com_enc(<<C:1/unit:8,B/binary>>, Fun, N, L, Ps) when C >= $a, C =< $z; + C >= $A, C =< $Z; + C >= $0, C =< $9 -> + com_enc(B, Fun, N, [C | L], Ps); +com_enc(<<>>, Fun, N, L, Ps) -> + case Fun() of + {<<>>, _} -> + com_enc_end([L | Ps]); + {B, Fun1} -> + com_enc(B, Fun1, N, L, Ps) + end; +com_enc(<<"-",B/binary>>, Fun, N, L, Ps) -> + com_enc(B, Fun, N, [], [L | Ps]); +com_enc(_B, _Fun, _N, L, Ps) -> + com_enc_end([L | Ps]). + +com_enc_end(Ps0) -> + Ps = lists:reverse([lists:reverse(string:to_lower(P)) || P <- Ps0]), + com_encoding(Ps). + +com_encoding(["latin","1"|_]) -> + latin1; +com_encoding(["utf","8"|_]) -> + utf8; +com_encoding(_) -> + throw(no). % Don't try any further + normalize_typed_record_fields([]) -> {typed, []}; normalize_typed_record_fields(Fields) -> @@ -266,14 +438,17 @@ init_server(Pid, Name, File, AtLocation, Path, Pdm, Pre) -> Ms0 = predef_macros(Name), case user_predef(Pdm, Ms0) of {ok,Ms1} -> - epp_reply(Pid, {ok,self()}), - %% ensure directory of current source file is first in path + _ = set_encoding(File), + epp_reply(Pid, {ok,self()}), + %% ensure directory of current source file is + %% first in path Path1 = [filename:dirname(Name) | Path], - St = #epp{file=File, location=AtLocation, delta=0, name=Name, - name2=Name, path=Path1, macs=Ms1, pre_opened = Pre}, - From = wait_request(St), - enter_file_reply(From, Name, AtLocation, AtLocation), - wait_req_scan(St); + St = #epp{file=File, location=AtLocation, delta=0, + name=Name, name2=Name, path=Path1, macs=Ms1, + pre_opened = Pre}, + From = wait_request(St), + enter_file_reply(From, Name, AtLocation, AtLocation), + wait_req_scan(St); {error,E} -> epp_reply(Pid, {error,E}) end. @@ -385,19 +560,20 @@ enter_file(NewName, Inc, From, St) -> %% enter_file2(File, FullName, From, EppState, AtLocation) -> EppState. %% Set epp to use this file and "enter" it. -enter_file2(NewF, Pname, From, St, AtLocation) -> +enter_file2(NewF, Pname, From, St0, AtLocation) -> Loc = start_loc(AtLocation), enter_file_reply(From, Pname, Loc, AtLocation), - Ms = dict:store({atom,'FILE'}, {none,[{string,Loc,Pname}]}, St#epp.macs), + Ms = dict:store({atom,'FILE'}, {none,[{string,Loc,Pname}]}, St0#epp.macs), %% update the head of the include path to be the directory of the new %% source file, so that an included file can always include other files %% relative to its current location (this is also how C does it); note %% that the directory of the parent source file (the previous head of %% the path) must be dropped, otherwise the path used within the current %% file will depend on the order of file inclusions in the parent files - Path = [filename:dirname(Pname) | tl(St#epp.path)], + Path = [filename:dirname(Pname) | tl(St0#epp.path)], + _ = set_encoding(NewF), #epp{file=NewF,location=Loc,name=Pname,delta=0, - sstk=[St|St#epp.sstk],path=Path,macs=Ms}. + sstk=[St0|St0#epp.sstk],path=Path,macs=Ms}. enter_file_reply(From, Name, Location, AtLocation) -> Attr = loc_attr(AtLocation), @@ -456,7 +632,7 @@ leave_file(From, St) -> %% scan_toks(Tokens, From, EppState) scan_toks(From, St) -> - case io:scan_erl_form(St#epp.file, '', St#epp.location) of + case io:scan_erl_form(St#epp.file, '', St#epp.location, [unicode]) of {ok,Toks,Cl} -> scan_toks(Toks, From, St#epp{location=Cl}); {error,E,Cl} -> @@ -830,7 +1006,7 @@ new_location(Ln, {Le,_}, {Lf,_}) -> %% nested conditionals and repeated 'else's. skip_toks(From, St, [I|Sis]) -> - case io:scan_erl_form(St#epp.file, '', St#epp.location) of + case io:scan_erl_form(St#epp.file, '', St#epp.location, [unicode]) of {ok,[{'-',_Lh},{atom,_Li,ifdef}|_Toks],Cl} -> skip_toks(From, St#epp{location=Cl}, [ifdef,I|Sis]); {ok,[{'-',_Lh},{atom,_Li,ifndef}|_Toks],Cl} -> @@ -1094,6 +1270,7 @@ expand_arg([], Ts, L, Rest, Bs) -> %%% tokenized would yield the token list Ts. %% erl_scan:token_info(T, text) is not backward compatible with this. +%% Note that escaped characters will be replaced by themselves. token_src({dot, _}) -> "."; token_src({X, _}) when is_atom(X) -> @@ -1101,16 +1278,16 @@ token_src({X, _}) when is_atom(X) -> token_src({var, _, X}) -> atom_to_list(X); token_src({char,_,C}) -> - io_lib:write_char(C); + io_lib:write_unicode_char(C); token_src({string, _, X}) -> - lists:flatten(io_lib:format("~p", [X])); + io_lib:write_unicode_string(X); token_src({_, _, X}) -> - lists:flatten(io_lib:format("~w", [X])). + io_lib:format("~w", [X]). stringify1([]) -> []; stringify1([T | Tokens]) -> - [io_lib:format(" ~s", [token_src(T)]) | stringify1(Tokens)]. + [io_lib:format(" ~ts", [token_src(T)]) | stringify1(Tokens)]. stringify(Ts, L) -> [$\s | S] = lists:flatten(stringify1(Ts)), |