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%% Licensed to the Apache Software Foundation (ASF) under one
%% or more contributor license agreements. See the NOTICE file
%% distributed with this work for additional information
%% regarding copyright ownership. The ASF licenses this file
%% to you 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.
-module(eini).
-author('shino@accense.com').
-author('nakai@accense.com').
-export([parse/1]).
-export([lookup_value/3,
register/2,
register/4,
is_section/2]).
-export([start_link/0]).
-export([init/1,
handle_call/3,
handle_cast/2,
handle_info/2,
terminate/2,
code_change/3]).
%% for debug use
-export([lex/1, parse_tokens/1]).
-define(EINI_TABLE, eini_table).
-type sections() :: [section()].
-type section() :: {Title::atom(), [property()]}.
-type property() :: {Key::atom(), Value::binary()}.
-type reason() :: {illegal_character, Line::integer(), Reason::string()}
| {syntax_error, Line::integer(), Reason::string()}
| {duplicate_title, Title::binary()}
| {duplicate_key, Title::binary(), Key::binary()}.
-spec parse(Content:: string() | binary()) -> {ok, sections()}
| {error, reason()}.
parse(Content) when is_binary(Content) ->
parse(binary_to_list(Content));
parse(Content) when is_list(Content) ->
case lex(Content) of
{ok, Tokens} ->
parse_and_validate(Tokens);
{error, Reason} ->
{error, Reason}
end.
parse_and_validate(Tokens) ->
case parse_tokens(Tokens) of
{ok, Parsed} ->
validate(Parsed);
{error, Reason} ->
{error, Reason}
end.
-spec lex(string()) -> {ok, list(Token::tuple())}
| {error, {illegal_character, Line::integer(), Reason::string()}}.
lex(String) when is_list(String) ->
%% Add \n char at the end if does NOT end by \n
%% TOD(shino): more simple logic?
String2 = case String of
"" ->
"\n";
_NotEmpty ->
case lists:last(String) of
$\n ->
String;
_ ->
String ++ "\n"
end
end,
case eini_lexer:string(String2) of
{ok, [{break, _Line}|RestTokens], _EndLine} ->
{ok, RestTokens};
{ok, Tokens, _EndLine} ->
{ok, Tokens};
{error, {ErrorLine, Mod, Reason}, _EndLine} ->
{error, {illegal_character, ErrorLine, Mod:format_error(Reason)}}
end.
-spec parse_tokens(Token::tuple()) ->
{ok, sections()}
| {error, {syntax_error, Line::integer(), Reason::string()}}.
parse_tokens(Tokens) ->
case eini_parser:parse(Tokens) of
{ok, Res} ->
{ok, Res};
{error, {Line, Mod, Reason}} ->
{error, {syntax_error, Line, Mod:format_error(Reason)}}
end.
-spec validate(sections()) ->
{ok, sections()}
| {error, {duplicate_title, Title::binary()}}
| {error, {duplicate_key, Title::binary(), Key::binary()}}.
validate(Sections) ->
validate(Sections, [], []).
validate([], _AccTitles, AccSections) ->
{ok, lists:reverse(AccSections)};
validate([{Title, Properties} = Section | Sections], AccTitles, AccSections) ->
case lists:member(Title, AccTitles) of
true ->
{error, {duplicate_title, Title}};
false ->
validate(Sections, [Title|AccTitles], [Section|AccSections], Properties, [])
end.
validate(Sections, AccTitles, AccSections, [], _AccKeys) ->
validate(Sections, AccTitles, AccSections);
validate(Sections, AccTitles, AccSections, [{Key, _Value}|Properties], AccKeys) ->
case lists:member(Key, AccKeys) of
true ->
{error, {duplicate_key, hd(AccTitles), Key}};
false ->
validate(Sections, AccTitles, AccSections, Properties, [Key|AccKeys])
end.
-spec lookup_value(file:name(), atom(), atom()) -> not_found | binary().
lookup_value(Filename, Section, Name) ->
case ets:lookup(?EINI_TABLE, {Filename, Section, Name}) of
[] ->
not_found;
[{_, Value}] ->
Value
end.
-spec register(file:name(), binary()) -> ok | {error, reason()}.
register(Filename, Binary) ->
gen_server:call(?MODULE, {register, Filename, Binary}).
-spec register(file:name(), atom(), atom(), any()) -> ok | {error, duplicate_key}.
register(Filename, Section, Name, Value) when is_atom(Section) andalso is_atom(Name) ->
gen_server:call(?MODULE, {register, Filename, Section, Name, Value}).
start_link() ->
gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
init(_Args) ->
process_flag(trap_exit, true),
Options = [set, protected, named_table, {read_concurrency, true}],
_Tid = ets:new(?EINI_TABLE, Options),
{ok, {}}.
handle_call({register, Filename, Section, Name, Value}, _From, State) ->
case ets:insert_new(?EINI_TABLE, {{Filename, Section, Name}, Value}) of
true ->
{reply, ok, State};
false ->
{reply, {error, duplicate_key}, State}
end;
handle_call({register, Filename, Binary}, _From, State) ->
case eini:parse(Binary) of
{ok, Sections} ->
case insert_sections(Filename, Sections) of
ok ->
true = ets:insert_new(?EINI_TABLE, {Filename, Binary}),
{reply, ok, State};
{error, Reason} ->
{reply, {error, Reason}, State}
end;
{error, Reason} ->
{reply, {error, Reason}, State}
end;
handle_call(_Request, _From, State) ->
{noreply, State}.
handle_cast(_Request, State) ->
{noreply, State}.
handle_info(_Request, State) ->
{noreply, State}.
terminate(_Reason, _State) ->
ok.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
-spec is_section(file:name(), atom()) -> boolean().
is_section(Filename, Section) ->
case ets:match_object(?EINI_TABLE, {{Filename, Section, '_'}, '_'}) of
[] ->
false;
_ ->
true
end.
-spec insert_sections(file:name(), [{atom(), [property()]}]) -> ok.
insert_sections(_Filename, []) ->
ok;
insert_sections(Filename, [{Section, ListOfParameter}|ListOfSection]) ->
insert_section(Filename, ListOfSection, Section, ListOfParameter).
-spec insert_section(file:name(), sections(), atom(), [property()]) -> ok.
insert_section(Filename, ListOfSection, _Section, []) ->
insert_sections(Filename, ListOfSection);
insert_section(Filename, ListOfSection, Section, [{Name, Value}|ListOfParameter]) ->
case ets:insert_new(?EINI_TABLE, {{Filename, Section, Name}, Value}) of
true ->
insert_section(Filename, ListOfSection, Section, ListOfParameter);
false ->
{error, duplicate_key}
end.