forked from extend/goldrush
-
Notifications
You must be signed in to change notification settings - Fork 0
/
glc_code.erl
363 lines (319 loc) · 13.2 KB
/
glc_code.erl
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
%% @doc Code generation functions.
-module(glc_code).
-export([
compile/2
]).
-define(erl, erl_syntax).
-record(module, {
'query' :: term(),
tables :: [{atom(), ets:tid()}],
qtree :: term()
}).
-type syntaxTree() :: erl_syntax:syntaxTree().
-record(state, {
event = undefined :: syntaxTree(),
fields = [] :: [{atom(), syntaxTree()}],
fieldc = 0 :: non_neg_integer(),
paramvars = [] :: [{term(), syntaxTree()}],
paramstab = undefined :: ets:tid()
}).
-type nextFun() :: fun((#state{}) -> [syntaxTree()]).
compile(Module, ModuleData) ->
{ok, forms, Forms} = abstract_module(Module, ModuleData),
{ok, Module, Binary} = compile_forms(Forms, []),
{ok, loaded, Module} = load_binary(Module, Binary),
{ok, Module}.
%% abstract code geneation functions
%% @private Generate an abstract dispatch module.
-spec abstract_module(atom(), #module{}) -> {ok, forms, list()}.
abstract_module(Module, Data) ->
Forms = [?erl:revert(E) || E <- abstract_module_(Module, Data)],
case lists:keyfind(errors, 1, erl_syntax_lib:analyze_forms(Forms)) of
false -> {ok, forms, Forms};
{_, []} -> {ok, forms, Forms};
{_, [_|_]}=Errors -> Errors
end.
%% @private Generate an abstract dispatch module.
-spec abstract_module_(atom(), #module{}) -> [?erl:syntaxTree()].
abstract_module_(Module, #module{tables=Tables, qtree=Tree}=Data) ->
{_, ParamsTable} = lists:keyfind(params, 1, Tables),
AbstractMod = [
%% -module(Module)
?erl:attribute(?erl:atom(module), [?erl:atom(Module)]),
%% -export([
?erl:attribute(
?erl:atom(export),
[?erl:list([
%% info/1
?erl:arity_qualifier(
?erl:atom(info),
?erl:integer(1)),
%% table/1
?erl:arity_qualifier(
?erl:atom(table),
?erl:integer(1)),
%% handle/1
?erl:arity_qualifier(
?erl:atom(handle),
?erl:integer(1))])]),
%% ]).
%% info(Name) -> Term.
?erl:function(
?erl:atom(info),
abstract_info(Data) ++
[?erl:clause(
[?erl:underscore()], none,
[abstract_apply(erlang, error, [?erl:atom(badarg)])])]),
%% table(Name) -> ets:tid().
?erl:function(
?erl:atom(table),
abstract_tables(Tables) ++
[?erl:clause(
[?erl:underscore()], none,
[abstract_apply(erlang, error, [?erl:atom(badarg)])])]),
%% handle(Event) - entry function
?erl:function(
?erl:atom(handle),
[?erl:clause([?erl:variable("Event")], none,
[abstract_count(input),
?erl:application(none,
?erl:atom(handle_), [?erl:variable("Event")])])]),
%% input_(Node, App, Pid, Tags, Values) - filter roots
?erl:function(
?erl:atom(handle_),
[?erl:clause([?erl:variable("Event")], none,
abstract_filter(Tree, #state{
event=?erl:variable("Event"),
paramstab=ParamsTable}))])
],
%% Transform Term -> Key to Key -> Term
ParamsList = [{K, V} || {V, K} <- ets:tab2list(ParamsTable)],
ets:delete_all_objects(ParamsTable),
ets:insert(ParamsTable, ParamsList),
AbstractMod.
%% @private Return the clauses of the table/1 function.
abstract_tables(Tables) ->
[?erl:clause(
[?erl:abstract(K)], none,
[?erl:abstract(V)])
|| {K, V} <- Tables].
%% @private Return the clauses of the info/1 function.
abstract_info(#module{'query'=Query}) ->
[?erl:clause([?erl:abstract(K)], none, V)
|| {K, V} <- [
{'query', abstract_query(Query)},
{input, abstract_getcount(input)},
{filter, abstract_getcount(filter)},
{output, abstract_getcount(output)}
]].
%% @private Return the original query as an expression.
abstract_query({with, _, _}) ->
[?erl:abstract([])];
abstract_query(Query) ->
[?erl:abstract(Query)].
%% @private Return a list of expressions to apply a filter.
%% @todo Allow mulitple functions to be specified using `with/2'.
-spec abstract_filter(glc_ops:op(), #state{}) -> [syntaxTree()].
abstract_filter({with, Cond, Fun}, State) ->
abstract_filter_(Cond,
_OnMatch=fun(State2) ->
[abstract_count(output)] ++ abstract_with(Fun, State2) end,
_OnNomatch=fun(_State2) -> [abstract_count(filter)] end, State);
abstract_filter(Cond, State) ->
abstract_filter_(Cond,
_OnMatch=fun(_State2) -> [abstract_count(output)] end,
_OnNomatch=fun(_State2) -> [abstract_count(filter)] end, State).
%% @private Return a list of expressions to apply a filter.
%% A filter expects two continuation functions which generates the expressions
%% to apply when the filter matches or fails to match. The state passed to the
%% functions will be contain all variable bindings to previously accessed
%% fields and parameters.
-spec abstract_filter_(glc_ops:op(), nextFun(), nextFun(), #state{}) ->
syntaxTree().
abstract_filter_({null, true}, OnMatch, _OnNomatch, State) ->
OnMatch(State);
abstract_filter_({null, false}, _OnMatch, OnNomatch, State) ->
OnNomatch(State);
abstract_filter_({Key, Op, Value}, OnMatch, OnNomatch, State)
when Op =:= '>'; Op =:= '='; Op =:= '<' ->
Op2 = case Op of '=' -> '=:='; Op -> Op end,
abstract_opfilter(Key, Op2, Value, OnMatch, OnNomatch, State);
abstract_filter_({'any', Conds}, OnMatch, OnNomatch, State) ->
abstract_any(Conds, OnMatch, OnNomatch, State);
abstract_filter_({'all', Conds}, OnMatch, OnNomatch, State) ->
abstract_all(Conds, OnMatch, OnNomatch, State).
%% @private Return a branch based on a built in operator.
-spec abstract_opfilter(atom(), atom(), term(), nextFun(),
nextFun(), #state{}) -> [syntaxTree()].
abstract_opfilter(Key, Opname, Value, OnMatch, OnNomatch, State) ->
abstract_getkey(Key,
_OnMatch=fun(#state{}=State2) ->
[?erl:case_expr(
abstract_apply(erlang, Opname, [
?erl:variable(field_variable(Key)),
?erl:abstract(Value)
]),
[?erl:clause([?erl:atom(true)], none,
OnMatch(State2)),
?erl:clause([?erl:atom(false)], none,
OnNomatch(State2))])] end,
_OnNomatch=fun(State2) -> OnNomatch(State2) end, State).
%% @private Generate an `all' filter.
%% An `all' filter is evaluated by testing all conditions that must hold. If
%% any of the conditions does not hold the evaluation is short circuted at that
%% point. This means that the `OnNomatch' branch is executed once for each
%% condition. The `OnMatch' branch is only executed once.
-spec abstract_all([glc_ops:op()], nextFun(), nextFun(), #state{}) ->
[syntaxTree()].
abstract_all([H|T], OnMatch, OnNomatch, State) ->
abstract_filter_(H,
_OnMatch=fun(State2) -> abstract_all(T, OnMatch, OnNomatch, State2)
end, OnNomatch, State);
abstract_all([], OnMatch, _OnNomatch, State) ->
OnMatch(State).
%% @private
-spec abstract_any([glc_ops:op()], nextFun(), nextFun(), #state{}) ->
[syntaxTree()].
abstract_any([H|T], OnMatch, OnNomatch, State) ->
abstract_filter_(H, OnMatch,
_OnNomatch=fun(State2) -> abstract_any(T, OnMatch, OnNomatch, State2)
end, State);
abstract_any([], _OnMatch, OnNomatch, State) ->
OnNomatch(State).
%% @private
-spec abstract_with(fun((gre:event()) -> term()), #state{}) -> [syntaxTree()].
abstract_with(Fun, State) when is_function(Fun, 1) ->
abstract_getparam(Fun, fun(#state{event=Event, paramvars=Params}) ->
{_, Fun2} = lists:keyfind(Fun, 1, Params),
[?erl:application(none, Fun2, [Event])]
end, State).
%% @private Bind the value of a field to a variable.
%% If the value of a field has already been bound to a variable the previous
%% binding is reused over re-accessing the value. The `OnMatch' function is
%% expected to access the variable stored in the state record. The `OnNomatch'
%% function must not attempt to access the variable.
-spec abstract_getkey(atom(), nextFun(), nextFun(), #state{}) ->
[syntaxTree()].
abstract_getkey(Key, OnMatch, OnNomatch, #state{fields=Fields}=State) ->
case lists:keyfind(Key, 1, Fields) of
{Key, _Variable} -> OnMatch(State);
false -> abstract_getkey_(Key, OnMatch, OnNomatch, State)
end.
-spec abstract_getkey_(atom(), nextFun(), nextFun(), #state{}) ->
[syntaxTree()].
abstract_getkey_(Key, OnMatch, OnNomatch, #state{
event=Event, fields=Fields}=State) ->
[?erl:case_expr(
abstract_apply(gre, find, [?erl:atom(Key), Event]),
[?erl:clause([
?erl:tuple([
?erl:atom(true),
?erl:variable(field_variable(Key))])], none,
OnMatch(State#state{
fields=[{Key, ?erl:variable(field_variable(Key))}
|Fields]})),
?erl:clause([
?erl:atom(false)], none,
OnNomatch(State))
]
)].
%% @private Bind the value of a parameter to a variable.
%% During code generation the parameter value is used as the identity of the
%% parameter. At runtime a unique integer is used as the identity.
-spec abstract_getparam(term(), nextFun(), #state{}) -> [syntaxTree()].
abstract_getparam(Term, OnBound, #state{paramvars=Params}=State) ->
case lists:keyfind(Term, 1, Params) of
{_, _Variable} -> OnBound(State);
%% parameter not bound to variable in this scope.
false -> abstract_getparam_(Term, OnBound, State)
end.
-spec abstract_getparam_(term(), nextFun(), #state{}) -> [syntaxTree()].
abstract_getparam_(Term, OnBound, #state{paramstab=Table,
paramvars=Params}=State) ->
Key = case ets:lookup(Table, Term) of
[{_, Key2}] ->
Key2;
[] ->
Key2 = ets:info(Table, size),
ets:insert(Table, {Term, Key2}),
Key2
end,
[?erl:match_expr(
param_variable(Key),
abstract_apply(ets, lookup_element,
[abstract_apply(table, [?erl:atom(params)]),
?erl:abstract(Key),
?erl:abstract(2)]))
] ++ OnBound(State#state{paramvars=[{Term, param_variable(Key)}|Params]}).
%% @private Generate a variable name for the value of a field.
-spec field_variable(atom()) -> string().
field_variable(Key) ->
"Field_" ++ field_variable_(atom_to_list(Key)).
%% @private Escape non-alphanumeric values.
-spec field_variable_(string()) -> string().
field_variable_([H|T]) when H >= $0, H =< $9 ->
[H|field_variable_(T)];
field_variable_([H|T]) when H >= $A, H =< $Z ->
[H|field_variable_(T)];
field_variable_([H|T]) when H >= $a, H =< $z ->
[H|field_variable_(T)];
field_variable_([H|T]) ->
"_" ++ integer_to_list(H, 16) ++ "_" ++ field_variable_(T);
field_variable_([]) ->
[].
%% @private Generate a variable name for the value of a parameter.
-spec param_variable(integer()) -> syntaxTree().
param_variable(Key) ->
?erl:variable("Param_" ++ integer_to_list(Key)).
%% @private Generate a list of field variable names.
%% Walk the query tree and generate a safe variable name string for each field
%% that is accessed by the conditions in the query. Only allow alpha-numeric.
%%-spec field_variables(glc_ops:op()) -> [{atom(), string()}].
%%field_variables(Query) ->
%% lists:usort(field_variables_(Query)).
%%-spec field_variables(glc_ops:op()) -> [{atom(), string()}].
%%field_variables_({Key, '=', _Term}) ->
%% [{Key, field_variable(Key)}].
%% @private Return an expression to increment a counter.
%% @todo Pass state record. Only Generate code if `statistics' is enabled.
-spec abstract_count(atom()) -> syntaxTree().
abstract_count(Counter) ->
abstract_apply(ets, update_counter,
[abstract_apply(table, [?erl:atom(counters)]),
?erl:abstract(Counter),
?erl:abstract({2,1})]).
%% @private Return an expression to get the value of a counter.
%% @todo Pass state record. Only Generate code if `statistics' is enabled.
-spec abstract_getcount(atom()) -> [syntaxTree()].
abstract_getcount(Counter) ->
[abstract_apply(ets, lookup_element,
[abstract_apply(table, [?erl:atom(counters)]),
?erl:abstract(Counter),
?erl:abstract(2)])].
%% abstract code util functions
%% @private Compile an abstract module.
-spec compile_forms(term(), [term()]) -> {ok, atom(), binary()}.
compile_forms(Forms, _Opts) ->
case compile:forms(Forms) of
{ok, Module, Binary} ->
{ok, Module, Binary};
{ok, Module, Binary, _Warnings} ->
{ok, Module, Binary};
Error ->
erlang:error({compile_forms, Error})
end.
%% @private Load a module binary.
-spec load_binary(atom(), binary()) -> {ok, loaded, atom()}.
load_binary(Module, Binary) ->
case code:load_binary(Module, "", Binary) of
{module, Module} -> {ok, loaded, Module};
{error, Reason} -> exit({error_loading_module, Module, Reason})
end.
%% @private Apply an exported function.
-spec abstract_apply(atom(), atom(), [syntaxTree()]) -> syntaxTree().
abstract_apply(Module, Function, Arguments) ->
?erl:application(?erl:atom(Module), ?erl:atom(Function), Arguments).
%% @private Apply a module local function.
-spec abstract_apply(atom(), [syntaxTree()]) -> syntaxTree().
abstract_apply(Function, Arguments) ->
?erl:application(?erl:atom(Function), Arguments).