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-rw-r--r--lib/stdlib/src/io_lib_fread.erl103
1 files changed, 43 insertions, 60 deletions
diff --git a/lib/stdlib/src/io_lib_fread.erl b/lib/stdlib/src/io_lib_fread.erl
index 33553692bc..ded1346097 100644
--- a/lib/stdlib/src/io_lib_fread.erl
+++ b/lib/stdlib/src/io_lib_fread.erl
@@ -1,7 +1,7 @@
%%
%% %CopyrightBegin%
%%
-%% Copyright Ericsson AB 1996-2010. All Rights Reserved.
+%% Copyright Ericsson AB 1996-2011. 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
@@ -22,27 +22,11 @@
-export([fread/2,fread/3]).
--export_type([continuation/0, fread_2_ret/0, fread_3_ret/0]).
-
-import(lists, [reverse/1,reverse/2]).
-%%-----------------------------------------------------------------------
-%% Local types
-%%-----------------------------------------------------------------------
-
--type done_arg2() :: {'ok', io_lib:chars()} | 'eof' | {'error', term()}.
-
-%%-----------------------------------------------------------------------
-%% Types also used in other files
-%%-----------------------------------------------------------------------
-
--type continuation() :: [] | {_, _, _, _}. % XXX: refine
-
--type fread_2_ret() :: {'ok', io_lib:chars(), string()}
- | {'more', string(), non_neg_integer(), io_lib:chars()}
- | {'error', term()}.
--type fread_3_ret() :: {'more', continuation()}
- | {'done', done_arg2(), string()}.
+-define(is_whitespace(C),
+ ((C) =:= $\s orelse (C) =:= $\t
+ orelse (C) =:= $\r orelse (C) =:= $\n)).
%%-----------------------------------------------------------------------
@@ -51,7 +35,15 @@
%% repeatedly collects lines and calls fread/2 to format the input until
%% all the format string has been used. And it counts the characters.
--spec fread(io_lib_fread:continuation(), string(), string()) -> fread_3_ret().
+-spec fread(Continuation, String, Format) -> Return when
+ Continuation :: io_lib:continuation() | [],
+ String :: string(),
+ Format :: string(),
+ Return :: {'more', Continuation1 :: io_lib:continuation()}
+ | {'done', Result, LeftOverChars :: string()},
+ Result :: {'ok', InputList :: io_lib:chars()}
+ | 'eof'
+ | {'error', What :: term()}.
fread([], Chars, Format) ->
%%io:format("FREAD: ~w `~s'~n", [Format,Chars]),
@@ -106,36 +98,39 @@ fread_line(Format0, Line, N0, Results0, More, Newline) ->
%% WHITE Skip white space
%% X Literal X
--spec fread(string(), string()) -> fread_2_ret().
+-spec fread(Format, String) -> Result when
+ Format :: string(),
+ String :: string(),
+ Result :: {'ok', InputList :: io_lib:chars(), LeftOverChars :: string()}
+ | {'more', RestFormat :: string(),
+ Nchars :: non_neg_integer(),
+ InputStack :: io_lib:chars()}
+ | {'error', What :: term()}.
fread(Format, Line) ->
fread(Format, Line, 0, []).
-fread([$~|Format0], Line, N, Results) ->
+fread([$~|Format0]=AllFormat, Line, N, Results) ->
{Format,F,Sup,Unicode} = fread_field(Format0),
- fread1(Format, F, Sup, Unicode, Line, N, Results, Format0);
-fread([$\s|Format], Line, N, Results) ->
- fread_skip_white(Format, Line, N, Results);
-fread([$\t|Format], Line, N, Results) ->
- fread_skip_white(Format, Line, N, Results);
-fread([$\r|Format], Line, N, Results) ->
- fread_skip_white(Format, Line, N, Results);
-fread([$\n|Format], Line, N, Results) ->
+ fread1(Format, F, Sup, Unicode, Line, N, Results, AllFormat);
+fread([C|Format], Line, N, Results) when ?is_whitespace(C) ->
fread_skip_white(Format, Line, N, Results);
fread([C|Format], [C|Line], N, Results) ->
fread(Format, Line, N+1, Results);
fread([_F|_Format], [_C|_Line], _N, _Results) ->
fread_error(input);
+fread([_|_]=Format, [], N, Results) ->
+ {more,Format,N,Results};
+fread([_|_], eof, 0, []) ->
+ %% This is at start of input so no error.
+ eof;
+fread([_|_], eof, _N, _Results) ->
+ %% This is an error as there is no more input.
+ fread_error(input);
fread([], Line, _N, Results) ->
{ok,reverse(Results),Line}.
-fread_skip_white(Format, [$\s|Line], N, Results) ->
- fread_skip_white(Format, Line, N+1, Results);
-fread_skip_white(Format, [$\t|Line], N, Results) ->
- fread_skip_white(Format, Line, N+1, Results);
-fread_skip_white(Format, [$\r|Line], N, Results) ->
- fread_skip_white(Format, Line, N+1, Results);
-fread_skip_white(Format, [$\n|Line], N, Results) ->
+fread_skip_white(Format, [C|Line], N, Results) when ?is_whitespace(C) ->
fread_skip_white(Format, Line, N+1, Results);
fread_skip_white(Format, Line, N, Results) ->
fread(Format, Line, N, Results).
@@ -171,9 +166,9 @@ fread1([$l|Format], _F, Sup, _U, Line, N, Res, _AllFormat) ->
fread(Format, Line, N, fread_result(Sup, N, Res));
fread1(_Format, _F, _Sup, _U, [], N, Res, AllFormat) ->
%% Need more input here.
- {more,[$~|AllFormat],N,Res};
-fread1(_Format, _F, _Sup, _U, eof, _N, [], _AllFormat) ->
- %% This is at start of format string so no error.
+ {more,AllFormat,N,Res};
+fread1(_Format, _F, _Sup, _U, eof, 0, [], _AllFormat) ->
+ %% This is at start of input so no error.
eof;
fread1(_Format, _F, _Sup, _U, eof, _N, _Res, _AllFormat) ->
%% This is an error as there is no more input.
@@ -391,26 +386,16 @@ fread_string_cs(Line0, N0, true) ->
%% fread_digits(Line, N, Base, Characters)
%% Read segments of things, return "thing" characters in reverse order.
-fread_skip_white([$\s|Line]) -> fread_skip_white(Line);
-fread_skip_white([$\t|Line]) -> fread_skip_white(Line);
-fread_skip_white([$\r|Line]) -> fread_skip_white(Line);
-fread_skip_white([$\n|Line]) -> fread_skip_white(Line);
+fread_skip_white([C|Line]) when ?is_whitespace(C) ->
+ fread_skip_white(Line);
fread_skip_white(Line) -> Line.
-fread_skip_white([$\s|Line], N) ->
- fread_skip_white(Line, N+1);
-fread_skip_white([$\t|Line], N) ->
- fread_skip_white(Line, N+1);
-fread_skip_white([$\r|Line], N) ->
- fread_skip_white(Line, N+1);
-fread_skip_white([$\n|Line], N) ->
+fread_skip_white([C|Line], N) when ?is_whitespace(C) ->
fread_skip_white(Line, N+1);
fread_skip_white(Line, N) -> {Line,N}.
-fread_skip_latin1_nonwhite([$\s|Line], N, Cs) -> {[$\s|Line],N,Cs};
-fread_skip_latin1_nonwhite([$\t|Line], N, Cs) -> {[$\t|Line],N,Cs};
-fread_skip_latin1_nonwhite([$\r|Line], N, Cs) -> {[$\r|Line],N,Cs};
-fread_skip_latin1_nonwhite([$\n|Line], N, Cs) -> {[$\n|Line],N,Cs};
+fread_skip_latin1_nonwhite([C|Line], N, Cs) when ?is_whitespace(C) ->
+ {[C|Line],N,Cs};
fread_skip_latin1_nonwhite([C|Line], N, []) when C > 255 ->
{[C|Line],N,error};
fread_skip_latin1_nonwhite([C|Line], N, Cs) when C > 255 ->
@@ -419,10 +404,8 @@ fread_skip_latin1_nonwhite([C|Line], N, Cs) ->
fread_skip_latin1_nonwhite(Line, N+1, [C|Cs]);
fread_skip_latin1_nonwhite([], N, Cs) -> {[],N,Cs}.
-fread_skip_nonwhite([$\s|Line], N, Cs) -> {[$\s|Line],N,Cs};
-fread_skip_nonwhite([$\t|Line], N, Cs) -> {[$\t|Line],N,Cs};
-fread_skip_nonwhite([$\r|Line], N, Cs) -> {[$\r|Line],N,Cs};
-fread_skip_nonwhite([$\n|Line], N, Cs) -> {[$\n|Line],N,Cs};
+fread_skip_nonwhite([C|Line], N, Cs) when ?is_whitespace(C) ->
+ {[C|Line],N,Cs};
fread_skip_nonwhite([C|Line], N, Cs) ->
fread_skip_nonwhite(Line, N+1, [C|Cs]);
fread_skip_nonwhite([], N, Cs) -> {[],N,Cs}.
generated by cgit v1.2.3 (git 2.25.1) at 2024-08-17 05:19:57 +0000