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|
%%%-------------------------------------------------------------------
%%% File : ejabberd_sql_pt.erl
%%% Author : Alexey Shchepin <alexey@process-one.net>
%%% Description : Parse transform for SQL queries
%%%
%%% Created : 20 Jan 2016 by Alexey Shchepin <alexey@process-one.net>
%%%-------------------------------------------------------------------
-module(ejabberd_sql_pt).
%% API
-export([parse_transform/2]).
-export([parse/2]).
-include("ejabberd_sql_pt.hrl").
-record(state, {loc,
'query' = [],
params = [],
param_pos = 0,
args = [],
res = [],
res_vars = [],
res_pos = 0}).
-define(QUERY_RECORD, "sql_query").
-define(ESCAPE_RECORD, "sql_escape").
-define(ESCAPE_VAR, "__SQLEscape").
-define(MOD, sql__module_).
%%====================================================================
%% API
%%====================================================================
%%--------------------------------------------------------------------
%% Function:
%% Description:
%%--------------------------------------------------------------------
parse_transform(AST, _Options) ->
%io:format("PT: ~p~nOpts: ~p~n", [AST, Options]),
NewAST = top_transform(AST),
%io:format("NewPT: ~p~n", [NewAST]),
NewAST.
%%====================================================================
%% Internal functions
%%====================================================================
transform(Form) ->
case erl_syntax:type(Form) of
application ->
case erl_syntax_lib:analyze_application(Form) of
{?SQL_MARK, 1} ->
case erl_syntax:application_arguments(Form) of
[Arg] ->
case erl_syntax:type(Arg) of
string ->
S = erl_syntax:string_value(Arg),
ParseRes =
parse(S, erl_syntax:get_pos(Arg)),
make_sql_query(ParseRes);
_ ->
throw({error, erl_syntax:get_pos(Form),
"?SQL argument must be "
"a constant string"})
end;
_ ->
throw({error, erl_syntax:get_pos(Form),
"wrong number of ?SQL args"})
end;
_ ->
Form
end;
attribute ->
case erl_syntax:atom_value(erl_syntax:attribute_name(Form)) of
module ->
case erl_syntax:attribute_arguments(Form) of
[M | _] ->
Module = erl_syntax:atom_value(M),
%io:format("module ~p~n", [Module]),
put(?MOD, Module),
Form;
_ ->
Form
end;
_ ->
Form
end;
_ ->
Form
end.
top_transform(Forms) when is_list(Forms) ->
lists:map(
fun(Form) ->
try
Form2 = erl_syntax_lib:map(
fun(Node) ->
%io:format("asd ~p~n", [Node]),
transform(Node)
end, Form),
Form3 = erl_syntax:revert(Form2),
Form3
catch
throw:{error, Line, Error} ->
{error, {Line, erl_parse, Error}}
end
end, Forms).
parse(S, Loc) ->
parse1(S, [], #state{loc = Loc}).
parse1([], Acc, State) ->
State1 = append_string(lists:reverse(Acc), State),
State1#state{'query' = lists:reverse(State1#state.'query'),
params = lists:reverse(State1#state.params),
args = lists:reverse(State1#state.args),
res = lists:reverse(State1#state.res),
res_vars = lists:reverse(State1#state.res_vars)
};
parse1([$@, $( | S], Acc, State) ->
State1 = append_string(lists:reverse(Acc), State),
{Name, Type, S1, State2} = parse_name(S, State1),
Var = "__V" ++ integer_to_list(State2#state.res_pos),
EVar = erl_syntax:variable(Var),
Convert =
case Type of
integer ->
erl_syntax:application(
erl_syntax:atom(binary_to_integer),
[EVar]);
string ->
EVar;
boolean ->
erl_syntax:application(
erl_syntax:atom(ejabberd_odbc),
erl_syntax:atom(to_bool),
[EVar])
end,
State3 = append_string(Name, State2),
State4 = State3#state{res_pos = State3#state.res_pos + 1,
res = [Convert | State3#state.res],
res_vars = [EVar | State3#state.res_vars]},
parse1(S1, [], State4);
parse1([$%, $( | S], Acc, State) ->
State1 = append_string(lists:reverse(Acc), State),
{Name, Type, S1, State2} = parse_name(S, State1),
Var = "__V" ++ integer_to_list(State2#state.param_pos),
EVar = erl_syntax:variable(Var),
Convert =
erl_syntax:application(
erl_syntax:record_access(
erl_syntax:variable(?ESCAPE_VAR),
erl_syntax:atom(?ESCAPE_RECORD),
erl_syntax:atom(Type)),
[erl_syntax:variable(Name)]),
State3 = State2,
State4 =
State3#state{'query' = [{var, EVar} | State3#state.'query'],
args = [Convert | State3#state.args],
params = [EVar | State3#state.params],
param_pos = State3#state.param_pos + 1},
parse1(S1, [], State4);
parse1([C | S], Acc, State) ->
parse1(S, [C | Acc], State).
append_string([], State) ->
State;
append_string(S, State) ->
State#state{query = [{str, S} | State#state.query]}.
parse_name(S, State) ->
parse_name(S, [], State).
parse_name([], Acc, State) ->
throw({error, State#state.loc,
"expected ')', found end of string"});
parse_name([$), T | S], Acc, State) ->
Type =
case T of
$d -> integer;
$s -> string;
$b -> boolean;
_ ->
throw({error, State#state.loc,
["unknown type specifier '", T, "'"]})
end,
{lists:reverse(Acc), Type, S, State};
parse_name([$)], Acc, State) ->
throw({error, State#state.loc,
"expected type specifier, found end of string"});
parse_name([C | S], Acc, State) ->
parse_name(S, [C | Acc], State).
make_sql_query(State) ->
Hash = erlang:phash2(State#state{loc = undefined}),
SHash = <<"Q", (integer_to_binary(Hash))/binary>>,
Query = pack_query(State#state.'query'),
EQuery =
lists:map(
fun({str, S}) ->
erl_syntax:binary(
[erl_syntax:binary_field(
erl_syntax:string(S))]);
({var, V}) -> V
end, Query),
erl_syntax:record_expr(
erl_syntax:atom(?QUERY_RECORD),
[erl_syntax:record_field(
erl_syntax:atom(hash),
%erl_syntax:abstract(SHash)
erl_syntax:binary(
[erl_syntax:binary_field(
erl_syntax:string(binary_to_list(SHash)))])),
erl_syntax:record_field(
erl_syntax:atom(args),
erl_syntax:fun_expr(
[erl_syntax:clause(
[erl_syntax:variable(?ESCAPE_VAR)],
none,
[erl_syntax:list(State#state.args)]
)])),
erl_syntax:record_field(
erl_syntax:atom(format_query),
erl_syntax:fun_expr(
[erl_syntax:clause(
[erl_syntax:list(State#state.params)],
none,
[erl_syntax:list(EQuery)]
)])),
erl_syntax:record_field(
erl_syntax:atom(format_res),
erl_syntax:fun_expr(
[erl_syntax:clause(
[erl_syntax:list(State#state.res_vars)],
none,
[erl_syntax:tuple(State#state.res)]
)])),
erl_syntax:record_field(
erl_syntax:atom(loc),
erl_syntax:abstract({get(?MOD), State#state.loc}))
]).
pack_query([]) ->
[];
pack_query([{str, S1}, {str, S2} | Rest]) ->
pack_query([{str, S1 ++ S2} | Rest]);
pack_query([X | Rest]) ->
[X | pack_query(Rest)].
|
