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938 lines (861 loc) · 29.6 KB
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%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2007-2021. 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%
-module(escript).
%% Useful functions that can be called from scripts.
-export([script_name/0, create/2, extract/2]).
%% Internal API.
-export([start/0, start/1, parse_file/1]).
%%-----------------------------------------------------------------------
-define(SHEBANG, "/usr/bin/env escript").
-define(COMMENT, "This is an -*- erlang -*- file").
%%-----------------------------------------------------------------------
-type mode() :: 'compile' | 'debug' | 'interpret' | 'run'.
-type source() :: 'archive' | 'beam' | 'text'.
-record(state, {file :: file:filename(),
module :: module(),
forms_or_bin,
source :: source() | 'undefined',
n_errors :: non_neg_integer(),
mode :: mode(),
exports_main :: boolean(),
has_records :: boolean()}).
-type shebang() :: string().
-type comment() :: string().
-type emu_args() :: string().
-record(sections, {type,
shebang :: shebang() | 'undefined',
comment :: comment() | 'undefined',
emu_args :: emu_args() | 'undefined',
body}).
-record(extract_options, {compile_source}).
-type zip_file() ::
file:filename()
| {file:filename(), binary()}
| {file:filename(), binary(), file:file_info()}.
-type section() ::
shebang
| {shebang, shebang() | default | undefined}
| comment
| {comment, comment() | default | undefined}
| {emu_args, emu_args() | undefined}
| {source, file:filename() | binary()}
| {beam, file:filename() | binary()}
| {archive, zip:filename() | binary()}
| {archive, [zip_file()], [zip:create_option()]}.
%%-----------------------------------------------------------------------
%% Create a complete escript file with both header and body
-spec create(file:filename() | binary, [section()]) ->
ok | {ok, binary()} | {error, term()}.
create(File, Options) when is_list(Options) ->
try
S = prepare(Options, #sections{}),
BinList =
[Section || Section <- [S#sections.shebang,
S#sections.comment,
S#sections.emu_args,
S#sections.body],
Section =/= undefined],
case File of
binary ->
{ok, list_to_binary(BinList)};
_ ->
case file:write_file(File, BinList) of
ok ->
ok;
{error, Reason} ->
{error, {Reason, File}}
end
end
catch
throw:PrepareReason ->
{error, PrepareReason}
end.
prepare([H | T], S) ->
case H of
{shebang, undefined} ->
prepare(T, S);
shebang ->
prepare(T, S#sections{shebang = "#!" ++ ?SHEBANG ++ "\n"});
{shebang, default} ->
prepare(T, S#sections{shebang = "#!" ++ ?SHEBANG ++ "\n"});
{shebang, Shebang} when is_list(Shebang) ->
prepare(T, S#sections{shebang = "#!" ++ Shebang ++ "\n"});
{comment, undefined} ->
prepare(T, S);
comment ->
prepare(T, S#sections{comment = "%% " ++ ?COMMENT ++ "\n"});
{comment, default} ->
prepare(T, S#sections{comment = "%% " ++ ?COMMENT ++ "\n"});
{comment, Comment} when is_list(Comment) ->
prepare(T, S#sections{comment = "%% " ++ Comment ++ "\n"});
{emu_args, undefined} ->
prepare(T, S);
{emu_args, Args} when is_list(Args) ->
prepare(T, S#sections{emu_args = "%%!" ++ Args ++ "\n"});
{Type, File} when is_list(File) ->
case file:read_file(File) of
{ok, Bin} ->
prepare(T, S#sections{type = Type, body = Bin});
{error, Reason} ->
throw({Reason, H})
end;
{Type, Bin} when is_binary(Bin) ->
prepare(T, S#sections{type = Type, body = Bin});
{archive = Type, ZipFiles, ZipOptions}
when is_list(ZipFiles), is_list(ZipOptions) ->
File = "dummy.zip",
case zip:create(File, ZipFiles, ZipOptions ++ [memory]) of
{ok, {File, ZipBin}} ->
prepare(T, S#sections{type = Type, body = ZipBin});
{error, Reason} ->
throw({Reason, H})
end;
_ ->
throw({badarg, H})
end;
prepare([], #sections{body = undefined}) ->
throw(missing_body);
prepare([], #sections{type = Type} = S)
when Type =:= source; Type =:= beam; Type =:= archive ->
S;
prepare([], #sections{type = Type}) ->
throw({illegal_type, Type});
prepare(BadOptions, _) ->
throw({badarg, BadOptions}).
-type section_name() :: shebang | comment | emu_args | body .
-type extract_option() :: compile_source | {section, [section_name()]}.
-spec extract(file:filename(), [extract_option()]) ->
{ok, [section()]} | {error, term()}.
extract(File, Options) when is_list(File), is_list(Options) ->
try
EO = parse_extract_options(Options,
#extract_options{compile_source = false}),
{HeaderSz, StartLine, Fd, Sections} =
parse_header(File, not EO#extract_options.compile_source),
Type = Sections#sections.type,
case {Type, EO#extract_options.compile_source} of
{source, true} ->
Bin = compile_source(Type, File, Fd, StartLine, HeaderSz);
{_, _} ->
ok = file:close(Fd),
case file:read_file(File) of
{ok, <<_Header:HeaderSz/binary, Bin/binary>>} ->
ok;
{error, ReadReason} ->
Bin = get_rid_of_compiler_warning,
throw(ReadReason)
end
end,
return_sections(Sections, Bin)
catch
throw:Reason ->
{error, Reason}
end.
parse_extract_options([H | T], EO) ->
case H of
compile_source ->
EO2 = EO#extract_options{compile_source = true},
parse_extract_options(T, EO2);
_ ->
throw({badarg, H})
end;
parse_extract_options([], EO) ->
EO.
compile_source(Type, File, Fd, StartLine, HeaderSz) ->
{text, _Module, Forms, _HasRecs, _Mode} =
do_parse_file(Type, File, Fd, StartLine, HeaderSz, false),
ok = file:close(Fd),
case compile:forms(Forms, [return_errors, debug_info]) of
{ok, _, BeamBin} ->
BeamBin;
{error, Errors, Warnings} ->
throw({compile, [{errors, format_errors(Errors)},
{warnings, format_errors(Warnings)}]})
end.
format_errors(CompileErrors) ->
[lists:flatten([File, ":", integer_to_list(LineNo), ": ",
Mod:format_error(Error)]) ||
{File, FileErrors} <- CompileErrors,
{LineNo, Mod, Error} <- FileErrors].
return_sections(S, Bin) ->
{ok, [normalize_section(shebang, S#sections.shebang),
normalize_section(comment, S#sections.comment),
normalize_section(emu_args, S#sections.emu_args),
normalize_section(S#sections.type, Bin)]}.
normalize_section(Name, undefined) ->
{Name, undefined};
normalize_section(shebang, "#!" ++ Chars) ->
Chopped = string:trim(Chars, trailing, "$\n"),
Stripped = string:trim(Chopped, both),
if
Stripped =:= ?SHEBANG ->
{shebang, default};
true ->
{shebang, Stripped}
end;
normalize_section(comment, Chars) ->
Chopped = string:trim(Chars, trailing, "$\n"),
Stripped = string:trim(string:trim(Chopped, leading, "$%"), both),
if
Stripped =:= ?COMMENT ->
{comment, default};
true ->
{comment, Stripped}
end;
normalize_section(emu_args, "%%!" ++ Chars) ->
Chopped = string:trim(Chars, trailing, "$\n"),
Stripped = string:trim(Chopped, both),
{emu_args, Stripped};
normalize_section(Name, Chars) ->
{Name, Chars}.
-spec script_name() -> string().
script_name() ->
[ScriptName|_] = init:get_plain_arguments(),
ScriptName.
%%
%% Internal API.
%%
-spec start() -> no_return().
start() ->
start([]).
-spec start([string()]) -> no_return().
start(EscriptOptions) ->
try
%% Commands run using -run or -s are run in a process
%% trap_exit set to false. Because this behaviour is
%% surprising for users of escript, make sure to reset
%% trap_exit to false.
process_flag(trap_exit, false),
case init:get_plain_arguments() of
[File|Args] ->
parse_and_run(File, Args, EscriptOptions);
[] ->
io:format(standard_error, "escript: Missing filename\n", []),
my_halt(127)
end
catch
throw:Str ->
put_chars(io_lib:format("escript: ~ts\n", [Str])),
my_halt(127);
_:Reason:Stk ->
put_chars(io_lib:format("escript: Internal error: ~tp\n", [Reason])),
put_chars(io_lib:format("~tp\n", [Stk])),
my_halt(127)
end.
-spec parse_and_run(_, _, _) -> no_return().
parse_and_run(File, Args, Options) ->
CheckOnly = lists:member("s", Options),
{Source, Module, FormsOrBin, HasRecs, Mode} =
parse_file(File, CheckOnly),
Mode2 =
case lists:member("d", Options) of
true ->
debug;
false ->
case lists:member("c", Options) of
true ->
compile;
false ->
case lists:member("i", Options) of
true -> interpret;
false -> Mode
end
end
end,
if
is_list(FormsOrBin) ->
case Mode2 of
interpret ->
interpret(FormsOrBin, HasRecs, File, Args);
compile ->
case compile:forms(FormsOrBin, [report]) of
{ok, Module, BeamBin} ->
{module, Module} = code:load_binary(Module, File, BeamBin),
run(Module, Args);
_Other ->
fatal("There were compilation errors.")
end;
debug ->
case compile:forms(FormsOrBin, [report, debug_info]) of
{ok,Module,BeamBin} ->
{module, Module} = code:load_binary(Module, File, BeamBin),
debug(Module, {Module, File, File, BeamBin}, Args);
_Other ->
fatal("There were compilation errors.")
end
end;
is_binary(FormsOrBin) ->
case Source of
archive ->
{ok, FileInfo} = file:read_file_info(File),
case code:set_primary_archive(File, FormsOrBin, FileInfo,
fun escript:parse_file/1) of
ok when CheckOnly ->
case code:load_file(Module) of
{module, _} ->
case erlang:function_exported(Module, main, 1) of
true ->
my_halt(0);
false ->
Text = lists:concat(["Function ", Module,
":main/1 is not exported"]),
fatal(Text)
end;
_ ->
Text = lists:concat(["Cannot load module ", Module,
" from archive"]),
fatal(Text)
end;
ok ->
case Mode2 of
run -> run(Module, Args);
debug -> debug(Module, Module, Args)
end;
{error, bad_eocd} ->
fatal("Not an archive file");
{error, Reason} ->
fatal(Reason)
end;
beam ->
case Mode2 of
run ->
{module, Module} = code:load_binary(Module, File, FormsOrBin),
run(Module, Args);
debug ->
[Base | Rest] = lists:reverse(filename:split(File)),
Base2 = filename:basename(Base, code:objfile_extension()),
Rest2 =
case Rest of
["ebin" | Top] -> ["src" | Top];
_ -> Rest
end,
SrcFile = filename:join(lists:reverse([Base2 ++ ".erl" | Rest2])),
debug(Module, {Module, SrcFile, File, FormsOrBin}, Args)
end
end
end.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Parse script
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Only used as callback by erl_prim_loader
parse_file(File) ->
try parse_file(File, false) of
{_Source, _Module, FormsOrBin, _HasRecs, _Mode}
when is_binary(FormsOrBin) ->
{ok, FormsOrBin};
_ ->
{error, no_archive_bin}
catch
throw:Reason ->
{error, Reason}
end.
parse_file(File, CheckOnly) ->
{HeaderSz, StartLine, Fd, Sections} =
parse_header(File, false),
do_parse_file(Sections#sections.type,
File, Fd, StartLine, HeaderSz, CheckOnly).
do_parse_file(Type, File, Fd, StartLine, HeaderSz, CheckOnly) ->
S = initial_state(File),
#state{mode = Mode,
source = Source,
module = Module,
forms_or_bin = FormsOrBin,
has_records = HasRecs} =
case Type of
archive ->
%% Archive file
ok = file:close(Fd),
parse_archive(S, File, HeaderSz);
beam ->
%% Beam file
ok = file:close(Fd),
parse_beam(S, File, HeaderSz, CheckOnly);
source ->
%% Source code
parse_source(S, File, Fd, StartLine, HeaderSz, CheckOnly)
end,
{Source, Module, FormsOrBin, HasRecs, Mode}.
initial_state(File) ->
#state{file = File,
n_errors = 0,
mode = interpret,
exports_main = false,
has_records = false}.
%% Skip header and make a heuristic guess about the script type
parse_header(File, KeepFirst) ->
LineNo = 1,
{ok, Fd} =
case file:open(File, [read]) of
{ok, Fd0} ->
{ok, Fd0};
{error, R} ->
fatal(lists:concat([file:format_error(R), ": '", File, "'"]))
end,
%% Skip shebang on first line
{ok, HeaderSz0} = file:position(Fd, cur),
Line1 = get_line(Fd),
case classify_line(Line1) of
shebang ->
find_first_body_line(Fd, HeaderSz0, LineNo, KeepFirst,
#sections{shebang = Line1});
archive ->
{HeaderSz0, LineNo, Fd,
#sections{type = archive}};
beam ->
{HeaderSz0, LineNo, Fd,
#sections{type = beam}};
_ ->
find_first_body_line(Fd, HeaderSz0, LineNo, KeepFirst,
#sections{})
end.
find_first_body_line(Fd, HeaderSz0, LineNo, KeepFirst, Sections) ->
{ok, HeaderSz1} = file:position(Fd, cur),
%% Look for special comment on second line
Line2 = get_line(Fd),
{ok, HeaderSz2} = file:position(Fd, cur),
if
Sections#sections.shebang =:= undefined,
KeepFirst =:= true ->
%% No shebang. Use the entire file
{HeaderSz0, LineNo, Fd,
Sections#sections{type = guess_type(Line2)}};
Sections#sections.shebang =:= undefined ->
%% No shebang. Skip the first line
{HeaderSz1, LineNo, Fd,
Sections#sections{type = guess_type(Line2)}};
true ->
case classify_line(Line2) of
emu_args ->
%% Skip special comment on second line
Line3 = get_line(Fd),
{HeaderSz2, LineNo + 2, Fd,
Sections#sections{type = guess_type(Line3),
comment = undefined,
emu_args = Line2}};
comment ->
%% Look for special comment on third line
Line3 = get_line(Fd),
{ok, HeaderSz3} = file:position(Fd, cur),
Line3Type = classify_line(Line3),
if
Line3Type =:= emu_args ->
%% Skip special comment on third line
Line4 = get_line(Fd),
{HeaderSz3, LineNo + 3, Fd,
Sections#sections{type = guess_type(Line4),
comment = Line2,
emu_args = Line3}};
true ->
%% Skip shebang on first line and comment on second
{HeaderSz2, LineNo + 2, Fd,
Sections#sections{type = guess_type(Line3),
comment = Line2}}
end;
_ ->
%% Just skip shebang on first line
{HeaderSz1, LineNo + 1, Fd,
Sections#sections{type = guess_type(Line2)}}
end
end.
classify_line(Line) ->
case Line of
"#!" ++ _ -> shebang;
"PK" ++ _ -> archive;
"FOR1" ++ _ -> beam;
"%%!" ++ _ -> emu_args;
"%" ++ _ -> comment;
_ -> undefined
end.
guess_type(Line) ->
case classify_line(Line) of
archive -> archive;
beam -> beam;
_ -> source
end.
get_line(P) ->
case io:get_line(P, '') of
eof ->
fatal("Premature end of file reached");
Line ->
Line
end.
parse_archive(S, File, HeaderSz) ->
case file:read_file(File) of
{ok, <<_Header:HeaderSz/binary, Bin/binary>>} ->
Mod =
case init:get_argument(escript) of
{ok, [["main", M]]} ->
%% Use explicit module name
list_to_atom(M);
_ ->
%% Use escript name without extension as module name
RevBase = lists:reverse(filename:basename(File)),
RevBase2 =
case lists:dropwhile(fun(X) -> X =/= $. end, RevBase) of
[$. | Rest] -> Rest;
[] -> RevBase
end,
list_to_atom(lists:reverse(RevBase2))
end,
S#state{source = archive,
mode = run,
module = Mod,
forms_or_bin = Bin};
{ok, _} ->
fatal("Illegal archive format");
{error, Reason} ->
fatal(file:format_error(Reason))
end.
parse_beam(S, File, HeaderSz, CheckOnly) ->
{ok, <<_Header:HeaderSz/binary, Bin/binary>>} =
file:read_file(File),
case beam_lib:chunks(Bin, [exports]) of
{ok, {Module, [{exports, Exports}]}} ->
case CheckOnly of
true ->
case lists:member({main, 1}, Exports) of
true ->
my_halt(0);
false ->
Text = lists:concat(["Function ", Module, ":main/1 is not exported"]),
fatal(Text)
end;
false ->
S#state{source = beam,
mode = run,
module = Module,
forms_or_bin = Bin}
end;
{error, beam_lib, Reason} when is_tuple(Reason) ->
fatal(element(1, Reason))
end.
parse_source(S, File, Fd, StartLine, HeaderSz, CheckOnly) ->
{PreDefMacros, Module} = pre_def_macros(File),
IncludePath = [],
%% Read the encoding on the second line, if there is any:
{ok, _} = file:position(Fd, 0),
_ = io:get_line(Fd, ''),
Encoding = epp:set_encoding(Fd),
{ok, _} = file:position(Fd, HeaderSz),
case epp:open([{fd, Fd}, {name, File}, {location, {StartLine, 1}},
{includes, IncludePath}, {macros, PreDefMacros}]) of
{ok, Epp} ->
_ = [io:setopts(Fd, [{encoding,Encoding}]) ||
Encoding =/= none],
{ok, FileForm} = epp:parse_erl_form(Epp),
OptModRes = epp:parse_erl_form(Epp),
S2 = S#state{source = text, module = Module},
S3 =
case OptModRes of
{ok, {attribute,_, module, M} = Form} ->
epp_parse_file(Epp, S2#state{module = M}, [Form, FileForm]);
{ok, _} ->
ModForm = {attribute,a1(),module, Module},
epp_parse_file2(Epp, S2, [ModForm, FileForm], OptModRes);
{error, _} ->
epp_parse_file2(Epp, S2, [FileForm], OptModRes);
{eof, LastLine} ->
S#state{forms_or_bin = [FileForm, {eof, LastLine}]}
end,
ok = epp:close(Epp),
ok = file:close(Fd),
check_source(S3, CheckOnly);
{error, Reason} ->
io:format(standard_error, "escript: ~tp\n", [Reason]),
fatal("Preprocessor error")
end.
check_source(S, CheckOnly) ->
case S of
#state{n_errors = Nerrs} when Nerrs =/= 0 ->
fatal("There were compilation errors.");
#state{exports_main = ExpMain,
forms_or_bin = [FileForm2, ModForm2 | Forms]} ->
%% Optionally add export of main/1
Forms2 =
case ExpMain of
false -> [{attribute, a0(), export, [{main,1}]} | Forms];
true -> Forms
end,
Forms3 = [FileForm2, ModForm2 | Forms2],
case CheckOnly of
true ->
%% Strong validation and halt
case compile:forms(Forms3, [report,strong_validation]) of
{ok,_} ->
my_halt(0);
_Other ->
fatal("There were compilation errors.")
end;
false ->
S#state{forms_or_bin = Forms3}
end
end.
pre_def_macros(File) ->
{MegaSecs, Secs, MicroSecs} = erlang:timestamp(),
Unique = erlang:unique_integer([positive]),
Replace = fun(Char) ->
case Char of
$\. -> $\_;
_ -> Char
end
end,
CleanBase = lists:map(Replace, filename:basename(File)),
ModuleStr =
CleanBase ++ "__" ++
"escript__" ++
integer_to_list(MegaSecs) ++ "__" ++
integer_to_list(Secs) ++ "__" ++
integer_to_list(MicroSecs) ++ "__" ++
integer_to_list(Unique),
Module = list_to_atom(ModuleStr),
PreDefMacros = [{'MODULE', Module, redefine},
{'MODULE_STRING', ModuleStr, redefine}],
{PreDefMacros, Module}.
epp_parse_file(Epp, S, Forms) ->
Parsed = epp:parse_erl_form(Epp),
epp_parse_file2(Epp, S, Forms, Parsed).
epp_parse_file2(Epp, S, Forms, {ok, {attribute, _, mode, native}}) ->
%% Native mode is no longer supported, just ignore it.
epp_parse_file(Epp, S, Forms);
epp_parse_file2(Epp, S, Forms, Parsed) ->
%% io:format(standard_error, "~p\n", [Parsed]),
case Parsed of
{ok, Form} ->
case Form of
{attribute,_,record, _} ->
S2 = S#state{has_records = true},
epp_parse_file(Epp, S2, [Form | Forms]);
{attribute,Ln,mode,NewMode} ->
S2 = S#state{mode = NewMode},
if
NewMode =:= compile; NewMode =:= interpret; NewMode =:= debug ->
epp_parse_file(Epp, S2, [Form | Forms]);
true ->
Args = lists:flatten(io_lib:format("illegal mode attribute: ~p", [NewMode])),
io:format(standard_error, "~ts:~s: ~s\n", [S#state.file,pos(Ln),Args]),
Error = {error,{Ln,erl_parse,Args}},
Nerrs= S#state.n_errors + 1,
epp_parse_file(Epp, S2#state{n_errors = Nerrs}, [Error | Forms])
end;
{attribute,_,export,Fs} ->
case lists:member({main,1}, Fs) of
false ->
epp_parse_file(Epp, S, [Form | Forms]);
true ->
epp_parse_file(Epp, S#state{exports_main = true}, [Form | Forms])
end;
_ ->
epp_parse_file(Epp, S, [Form | Forms])
end;
{error,{Ln,Mod,Args}} = Form ->
io:format(standard_error, "~ts:~s: ~ts\n",
[S#state.file,pos(Ln),Mod:format_error(Args)]),
epp_parse_file(Epp, S#state{n_errors = S#state.n_errors + 1}, [Form | Forms]);
{eof, LastLine} ->
S#state{forms_or_bin = lists:reverse([{eof, LastLine} | Forms])}
end.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Evaluate script
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-spec debug(_, _, _) -> no_return().
debug(Module, AbsMod, Args) ->
case hidden_apply(debugger, debugger, start, []) of
{ok, _} ->
case hidden_apply(debugger, int, i, [AbsMod]) of
{module, _} ->
hidden_apply(debugger, debugger, auto_attach, [[init]]),
run(Module, Args);
error ->
Text = lists:concat(["Cannot load the code for ", Module, " into the debugger"]),
fatal(Text)
end;
_ ->
fatal("Cannot start the debugger")
end.
-spec run(_, _) -> no_return().
run(Module, Args) ->
try
Module:main(Args),
my_halt(0)
catch
Class:Reason:StackTrace ->
fatal(format_exception(Class, Reason, StackTrace))
end.
-spec interpret(_, _, _, _) -> no_return().
interpret(Forms, HasRecs, File, Args) ->
%% Basic validation before execution
case erl_lint:module(Forms) of
{ok,Ws} ->
report_warnings(Ws);
{error,Es,Ws} ->
report_errors(Es),
report_warnings(Ws),
fatal("There were compilation errors.")
end,
%% Optionally expand records
Forms2 =
case HasRecs of
false -> Forms;
true -> erl_expand_records:module(Forms, [])
end,
Dict = parse_to_map(Forms2),
ArgsA = erl_parse:abstract(Args, 0),
Anno = a0(),
Call = {call,Anno,{atom,Anno,main},[ArgsA]},
try
_ = erl_eval:expr(Call,
erl_eval:new_bindings(),
{value,fun(I, J) ->
code_handler(I, J, Dict, File)
end}),
my_halt(0)
catch
Class:Reason:StackTrace ->
fatal(format_exception(Class, Reason, StackTrace))
end.
report_errors(Errors) ->
lists:foreach(fun ({{F,_L},Eds}) -> list_errors(F, Eds);
({F,Eds}) -> list_errors(F, Eds) end,
Errors).
list_errors(F, [{Line,Mod,E}|Es]) ->
io:fwrite(standard_error, "~ts:~s: ~ts\n", [F,pos(Line),Mod:format_error(E)]),
list_errors(F, Es);
list_errors(F, [{Mod,E}|Es]) ->
io:format(standard_error, "~ts: ~ts\n", [F,Mod:format_error(E)]),
list_errors(F, Es);
list_errors(_F, []) -> ok.
pos({Line,Col}) ->
io_lib:format("~w:~w", [Line,Col]);
pos(Line) ->
io_lib:format("~w", [Line]).
report_warnings(Ws0) ->
Ws1 = lists:flatmap(fun({{F,_L},Eds}) -> format_message(F, Eds);
({F,Eds}) -> format_message(F, Eds) end,
Ws0),
Ws = ordsets:from_list(Ws1),
lists:foreach(fun({_,Str}) -> io:put_chars(standard_error, Str) end, Ws).
format_message(F, [{Line,Mod,E}|Es]) ->
M = {{F,Line},io_lib:format("~ts:~s: Warning: ~ts\n", [F,pos(Line),Mod:format_error(E)])},
[M|format_message(F, Es)];
format_message(F, [{Mod,E}|Es]) ->
M = {none,io_lib:format("~ts: Warning: ~ts\n", [F,Mod:format_error(E)])},
[M|format_message(F, Es)];
format_message(_, []) -> [].
parse_to_map(L) -> parse_to_map(L, maps:new()).
parse_to_map([{function,_,Name,Arity,Clauses}|T], Map0) ->
Map = maps:put({local, Name,Arity}, Clauses, Map0),
parse_to_map(T, Map);
parse_to_map([{attribute,_,import,{Mod,Funcs}}|T], Map0) ->
Map = lists:foldl(fun(I, D) ->
maps:put({remote,I}, Mod, D)
end, Map0, Funcs),
parse_to_map(T, Map);
parse_to_map([_|T], Map) ->
parse_to_map(T, Map);
parse_to_map([], Map) ->
Map.
code_handler(local, [file], _, File) ->
File;
code_handler(Name, Args, Map, File) ->
%%io:format(standard_error, "code handler=~p~n",[{Name, Args}]),
Arity = length(Args),
case maps:find({local,Name,Arity}, Map) of
{ok, Cs} ->
LF = {value,fun(I, J) -> code_handler(I, J, Map, File) end},
case erl_eval:match_clause(Cs, Args,erl_eval:new_bindings(),LF) of
{Body, Bs} ->
eval_exprs(Body, Bs, LF, none, none);
nomatch ->
erlang:error({function_clause,[{local,Name,Args}]})
end;
error ->
case maps:find({remote,{Name,Arity}}, Map) of
{ok, Mod} ->
%% io:format(standard_error, "Calling:~p~n",[{Mod,Name,Args}]),
apply(Mod, Name, Args);
error ->
io:format(standard_error, "Script does not export ~tw/~w\n", [Name,Arity]),
my_halt(127)
end
end.
eval_exprs([E], Bs0, Lf, Ef, _RBs) ->
RBs1 = value,
erl_eval:expr(E, Bs0, Lf, Ef, RBs1);
eval_exprs([E|Es], Bs0, Lf, Ef, RBs) ->
RBs1 = none,
{value,_V,Bs} = erl_eval:expr(E, Bs0, Lf, Ef, RBs1),
eval_exprs(Es, Bs, Lf, Ef, RBs).
format_exception(Class, Reason, StackTrace) ->
Enc = encoding(),
P = case Enc of
latin1 -> "P";
_ -> "tP"
end,
PF = fun(Term, I) ->
io_lib:format("~." ++ integer_to_list(I) ++ P, [Term, 50])
end,
StackFun = fun(M, _F, _A) -> (M =:= erl_eval) or (M =:= ?MODULE) end,
erl_error:format_exception(1, Class, Reason, StackTrace, StackFun, PF, Enc).
encoding() ->
case io:getopts() of
{error, _}=_Er
5F5E
r ->
latin1;
Opts ->
case lists:keyfind(encoding, 1, Opts) of
false -> latin1;
{encoding, Encoding} -> Encoding
end
end.
put_chars(String) ->
try
io:put_chars(standard_error, String)
catch
_:_ ->
display_err(lists:flatten(String))
end.
display_err(String) ->
Port = open_port({fd,2,2}, [out,binary]),
Port ! {self(), {command, list_to_binary(String)}},
port_close(Port).
a0() ->
anno(0).
a1() ->
anno(1).
anno(L) ->
erl_anno:new(L).
fatal(Str) ->
throw(Str).
-spec my_halt(_) -> no_return().
my_halt(Reason) ->
erlang:halt(Reason).
hidden_apply(App, M, F, Args) ->
try
apply(fun() -> M end(), F, Args)
catch
error:undef:StackTrace ->
case StackTrace of
[{M,F,Args,_} | _] ->
Arity = length(Args),
Text = io_lib:format("Call to ~w:~w/~w in application ~w failed.\n",
[M, F, Arity, App]),
fatal(Text);
Stk ->
erlang:raise(error, undef, Stk)
end
end.