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
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
// This file is part of Substrate.

// Copyright (C) Parity Technologies (UK) Ltd.
// SPDX-License-Identifier: Apache-2.0

// 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.

//! Proc macro of Support code for the runtime.

#![recursion_limit = "512"]
#![deny(rustdoc::broken_intra_doc_links)]

mod benchmark;
mod construct_runtime;
mod crate_version;
mod derive_impl;
mod dummy_part_checker;
mod dynamic_params;
mod key_prefix;
mod match_and_insert;
mod no_bound;
mod pallet;
mod pallet_error;
mod storage_alias;
mod transactional;
mod tt_macro;

use frame_support_procedural_tools::generate_access_from_frame_or_crate;
use macro_magic::{import_tokens_attr, import_tokens_attr_verbatim};
use proc_macro::TokenStream;
use quote::{quote, ToTokens};
use std::{cell::RefCell, str::FromStr};
use syn::{parse_macro_input, Error, ItemImpl, ItemMod, TraitItemType};

pub(crate) const INHERENT_INSTANCE_NAME: &str = "__InherentHiddenInstance";

thread_local! {
	/// A global counter, can be used to generate a relatively unique identifier.
	static COUNTER: RefCell<Counter> = RefCell::new(Counter(0));
}

/// Counter to generate a relatively unique identifier for macros. This is necessary because
/// declarative macros gets hoisted to the crate root, which shares the namespace with other pallets
/// containing the very same macros.
struct Counter(u64);

impl Counter {
	fn inc(&mut self) -> u64 {
		let ret = self.0;
		self.0 += 1;
		ret
	}
}

/// Get the value from the given environment variable set by cargo.
///
/// The value is parsed into the requested destination type.
fn get_cargo_env_var<T: FromStr>(version_env: &str) -> std::result::Result<T, ()> {
	let version = std::env::var(version_env)
		.unwrap_or_else(|_| panic!("`{}` is always set by cargo; qed", version_env));

	T::from_str(&version).map_err(drop)
}

/// Generate the counter_prefix related to the storage.
/// counter_prefix is used by counted storage map.
fn counter_prefix(prefix: &str) -> String {
	format!("CounterFor{}", prefix)
}

/// Construct a runtime, with the given name and the given pallets.
///
/// The parameters here are specific types for `Block`, `NodeBlock`, and `UncheckedExtrinsic`
/// and the pallets that are used by the runtime.
/// `Block` is the block type that is used in the runtime and `NodeBlock` is the block type
/// that is used in the node. For instance they can differ in the extrinsics type.
///
/// # Example:
///
/// ```ignore
/// construct_runtime!(
///     pub enum Runtime where
///         Block = Block,
///         NodeBlock = node::Block,
///         UncheckedExtrinsic = UncheckedExtrinsic
///     {
///         System: frame_system::{Pallet, Call, Event<T>, Config<T>} = 0,
///         Test: path::to::test::{Pallet, Call} = 1,
///
///         // Pallets with instances.
///         Test2_Instance1: test2::<Instance1>::{Pallet, Call, Storage, Event<T, I>, Config<T, I>, Origin<T, I>},
///         Test2_DefaultInstance: test2::{Pallet, Call, Storage, Event<T>, Config<T>, Origin<T>} = 4,
///
///         // Pallets declared with `pallet` attribute macro: no need to define the parts
///         Test3_Instance1: test3::<Instance1>,
///         Test3_DefaultInstance: test3,
///
///         // with `exclude_parts` keyword some part can be excluded.
///         Test4_Instance1: test4::<Instance1> exclude_parts { Call, Origin },
///         Test4_DefaultInstance: test4 exclude_parts { Storage },
///
///         // with `use_parts` keyword, a subset of the pallet parts can be specified.
///         Test4_Instance1: test4::<Instance1> use_parts { Pallet, Call},
///         Test4_DefaultInstance: test4 use_parts { Pallet },
///     }
/// )
/// ```
///
/// Each pallet is declared as such:
/// * `Identifier`: name given to the pallet that uniquely identifies it.
///
/// * `:`: colon separator
///
/// * `path::to::pallet`: identifiers separated by colons which declare the path to a pallet
///   definition.
///
/// * `::<InstanceN>` optional: specify the instance of the pallet to use. If not specified it will
///   use the default instance (or the only instance in case of non-instantiable pallets).
///
/// * `::{ Part1, Part2<T>, .. }` optional if pallet declared with `frame_support::pallet`: Comma
///   separated parts declared with their generic. If a pallet is declared with
///   `frame_support::pallet` macro then the parts can be automatically derived if not explicitly
///   provided. We provide support for the following module parts in a pallet:
///
///   - `Pallet` - Required for all pallets
///   - `Call` - If the pallet has callable functions
///   - `Storage` - If the pallet uses storage
///   - `Event` or `Event<T>` (if the event is generic) - If the pallet emits events
///   - `Origin` or `Origin<T>` (if the origin is generic) - If the pallet has instanciable origins
///   - `Config` or `Config<T>` (if the config is generic) - If the pallet builds the genesis
///     storage with `GenesisConfig`
///   - `Inherent` - If the pallet provides/can check inherents.
///   - `ValidateUnsigned` - If the pallet validates unsigned extrinsics.
///
///   It is important to list these parts here to export them correctly in the metadata or to make
/// the pallet usable in the runtime.
///
/// * `exclude_parts { Part1, Part2 }` optional: comma separated parts without generics. I.e. one of
///   `Pallet`, `Call`, `Storage`, `Event`, `Origin`, `Config`, `Inherent`, `ValidateUnsigned`. It
///   is incompatible with `use_parts`. This specifies the part to exclude. In order to select
///   subset of the pallet parts.
///
///   For example excluding the part `Call` can be useful if the runtime doesn't want to make the
///   pallet calls available.
///
/// * `use_parts { Part1, Part2 }` optional: comma separated parts without generics. I.e. one of
///   `Pallet`, `Call`, `Storage`, `Event`, `Origin`, `Config`, `Inherent`, `ValidateUnsigned`. It
///   is incompatible with `exclude_parts`. This specifies the part to use. In order to select a
///   subset of the pallet parts.
///
///   For example not using the part `Call` can be useful if the runtime doesn't want to make the
///   pallet calls available.
///
/// * `= $n` optional: number to define at which index the pallet variants in `OriginCaller`, `Call`
///   and `Event` are encoded, and to define the ModuleToIndex value.
///
///   if `= $n` is not given, then index is resolved in the same way as fieldless enum in Rust
///   (i.e. incrementedly from previous index):
///   ```nocompile
///   pallet1 .. = 2,
///   pallet2 .., // Here pallet2 is given index 3
///   pallet3 .. = 0,
///   pallet4 .., // Here pallet4 is given index 1
///   ```
///
/// # Note
///
/// The population of the genesis storage depends on the order of pallets. So, if one of your
/// pallets depends on another pallet, the pallet that is depended upon needs to come before
/// the pallet depending on it.
///
/// # Type definitions
///
/// * The macro generates a type alias for each pallet to their `Pallet`. E.g. `type System =
///   frame_system::Pallet<Runtime>`
#[proc_macro]
pub fn construct_runtime(input: TokenStream) -> TokenStream {
	construct_runtime::construct_runtime(input)
}

///
/// ---
///
/// Rust-Analyzer Users: Documentation for this macro can be found at
/// `frame_support::pallet`.
#[proc_macro_attribute]
pub fn pallet(attr: TokenStream, item: TokenStream) -> TokenStream {
	pallet::pallet(attr, item)
}

/// An attribute macro that can be attached to a (non-empty) module declaration. Doing so will
/// designate that module as a benchmarking module.
///
/// See `frame_benchmarking::v2` for more info.
#[proc_macro_attribute]
pub fn benchmarks(attr: TokenStream, tokens: TokenStream) -> TokenStream {
	match benchmark::benchmarks(attr, tokens, false) {
		Ok(tokens) => tokens,
		Err(err) => err.to_compile_error().into(),
	}
}

/// An attribute macro that can be attached to a (non-empty) module declaration. Doing so will
/// designate that module as an instance benchmarking module.
///
/// See `frame_benchmarking::v2` for more info.
#[proc_macro_attribute]
pub fn instance_benchmarks(attr: TokenStream, tokens: TokenStream) -> TokenStream {
	match benchmark::benchmarks(attr, tokens, true) {
		Ok(tokens) => tokens,
		Err(err) => err.to_compile_error().into(),
	}
}

/// An attribute macro used to declare a benchmark within a benchmarking module. Must be
/// attached to a function definition containing an `#[extrinsic_call]` or `#[block]`
/// attribute.
///
/// See `frame_benchmarking::v2` for more info.
#[proc_macro_attribute]
pub fn benchmark(_attrs: TokenStream, _tokens: TokenStream) -> TokenStream {
	quote!(compile_error!(
		"`#[benchmark]` must be in a module labeled with #[benchmarks] or #[instance_benchmarks]."
	))
	.into()
}

/// An attribute macro used to specify the extrinsic call inside a benchmark function, and also
/// used as a boundary designating where the benchmark setup code ends, and the benchmark
/// verification code begins.
///
/// See `frame_benchmarking::v2` for more info.
#[proc_macro_attribute]
pub fn extrinsic_call(_attrs: TokenStream, _tokens: TokenStream) -> TokenStream {
	quote!(compile_error!(
		"`#[extrinsic_call]` must be in a benchmark function definition labeled with `#[benchmark]`."
	);)
	.into()
}

/// An attribute macro used to specify that a block should be the measured portion of the
/// enclosing benchmark function, This attribute is also used as a boundary designating where
/// the benchmark setup code ends, and the benchmark verification code begins.
///
/// See `frame_benchmarking::v2` for more info.
#[proc_macro_attribute]
pub fn block(_attrs: TokenStream, _tokens: TokenStream) -> TokenStream {
	quote!(compile_error!(
		"`#[block]` must be in a benchmark function definition labeled with `#[benchmark]`."
	))
	.into()
}

/// Execute the annotated function in a new storage transaction.
///
/// The return type of the annotated function must be `Result`. All changes to storage performed
/// by the annotated function are discarded if it returns `Err`, or committed if `Ok`.
///
/// # Example
///
/// ```nocompile
/// #[transactional]
/// fn value_commits(v: u32) -> result::Result<u32, &'static str> {
/// 	Value::set(v);
/// 	Ok(v)
/// }
///
/// #[transactional]
/// fn value_rollbacks(v: u32) -> result::Result<u32, &'static str> {
/// 	Value::set(v);
/// 	Err("nah")
/// }
/// ```
#[proc_macro_attribute]
pub fn transactional(attr: TokenStream, input: TokenStream) -> TokenStream {
	transactional::transactional(attr, input).unwrap_or_else(|e| e.to_compile_error().into())
}

///
/// ---
///
/// Rust-Analyzer Users: Documentation for this macro can be found at
/// `frame_support::require_transactional`.
#[proc_macro_attribute]
pub fn require_transactional(attr: TokenStream, input: TokenStream) -> TokenStream {
	transactional::require_transactional(attr, input)
		.unwrap_or_else(|e| e.to_compile_error().into())
}

/// Derive [`Clone`] but do not bound any generic.
///
/// Docs at `frame_support::CloneNoBound`.
#[proc_macro_derive(CloneNoBound)]
pub fn derive_clone_no_bound(input: TokenStream) -> TokenStream {
	no_bound::clone::derive_clone_no_bound(input)
}

/// Derive [`Debug`] but do not bound any generics.
///
/// Docs at `frame_support::DebugNoBound`.
#[proc_macro_derive(DebugNoBound)]
pub fn derive_debug_no_bound(input: TokenStream) -> TokenStream {
	no_bound::debug::derive_debug_no_bound(input)
}

/// Derive [`Debug`], if `std` is enabled it uses `frame_support::DebugNoBound`, if `std` is not
/// enabled it just returns `"<wasm:stripped>"`.
/// This behaviour is useful to prevent bloating the runtime WASM blob from unneeded code.
#[proc_macro_derive(RuntimeDebugNoBound)]
pub fn derive_runtime_debug_no_bound(input: TokenStream) -> TokenStream {
	if cfg!(any(feature = "std", feature = "try-runtime")) {
		no_bound::debug::derive_debug_no_bound(input)
	} else {
		let input = syn::parse_macro_input!(input as syn::DeriveInput);

		let name = &input.ident;
		let (impl_generics, ty_generics, where_clause) = input.generics.split_for_impl();

		quote::quote!(
			const _: () = {
				impl #impl_generics ::core::fmt::Debug for #name #ty_generics #where_clause {
					fn fmt(&self, fmt: &mut ::core::fmt::Formatter) -> core::fmt::Result {
						fmt.write_str("<wasm:stripped>")
					}
				}
			};
		)
		.into()
	}
}

/// Derive [`PartialEq`] but do not bound any generic.
///
/// Docs at `frame_support::PartialEqNoBound`.
#[proc_macro_derive(PartialEqNoBound)]
pub fn derive_partial_eq_no_bound(input: TokenStream) -> TokenStream {
	no_bound::partial_eq::derive_partial_eq_no_bound(input)
}

/// DeriveEq but do no bound any generic.
///
/// Docs at `frame_support::EqNoBound`.
#[proc_macro_derive(EqNoBound)]
pub fn derive_eq_no_bound(input: TokenStream) -> TokenStream {
	let input = syn::parse_macro_input!(input as syn::DeriveInput);

	let name = &input.ident;
	let (impl_generics, ty_generics, where_clause) = input.generics.split_for_impl();

	quote::quote_spanned!(name.span() =>
		const _: () = {
			impl #impl_generics ::core::cmp::Eq for #name #ty_generics #where_clause {}
		};
	)
	.into()
}

/// Derive [`PartialOrd`] but do not bound any generic. Docs are at
/// `frame_support::PartialOrdNoBound`.
#[proc_macro_derive(PartialOrdNoBound)]
pub fn derive_partial_ord_no_bound(input: TokenStream) -> TokenStream {
	no_bound::partial_ord::derive_partial_ord_no_bound(input)
}

/// Derive [`Ord`] but do no bound any generic. Docs are at `frame_support::OrdNoBound`.
#[proc_macro_derive(OrdNoBound)]
pub fn derive_ord_no_bound(input: TokenStream) -> TokenStream {
	no_bound::ord::derive_ord_no_bound(input)
}

/// derive `Default` but do no bound any generic. Docs are at `frame_support::DefaultNoBound`.
#[proc_macro_derive(DefaultNoBound, attributes(default))]
pub fn derive_default_no_bound(input: TokenStream) -> TokenStream {
	no_bound::default::derive_default_no_bound(input)
}

/// Macro used internally in FRAME to generate the crate version for a pallet.
#[proc_macro]
pub fn crate_to_crate_version(input: TokenStream) -> TokenStream {
	crate_version::crate_to_crate_version(input)
		.unwrap_or_else(|e| e.to_compile_error())
		.into()
}

/// The number of module instances supported by the runtime, starting at index 1,
/// and up to `NUMBER_OF_INSTANCE`.
pub(crate) const NUMBER_OF_INSTANCE: u8 = 16;

/// This macro is meant to be used by frame-support only.
/// It implements the trait `HasKeyPrefix` and `HasReversibleKeyPrefix` for tuple of `Key`.
#[proc_macro]
pub fn impl_key_prefix_for_tuples(input: TokenStream) -> TokenStream {
	key_prefix::impl_key_prefix_for_tuples(input)
		.unwrap_or_else(syn::Error::into_compile_error)
		.into()
}

/// Internal macro use by frame_support to generate dummy part checker for old pallet declaration
#[proc_macro]
pub fn __generate_dummy_part_checker(input: TokenStream) -> TokenStream {
	dummy_part_checker::generate_dummy_part_checker(input)
}

/// Macro that inserts some tokens after the first match of some pattern.
///
/// # Example:
///
/// ```nocompile
/// match_and_insert!(
///     target = [{ Some content with { at some point match pattern } other match pattern are ignored }]
///     pattern = [{ match pattern }] // the match pattern cannot contain any group: `[]`, `()`, `{}`
/// 								  // can relax this constraint, but will require modifying the match logic in code
///     tokens = [{ expansion tokens }] // content inside braces can be anything including groups
/// );
/// ```
///
/// will generate:
///
/// ```nocompile
///     Some content with { at some point match pattern expansion tokens } other match patterns are
///     ignored
/// ```
#[proc_macro]
pub fn match_and_insert(input: TokenStream) -> TokenStream {
	match_and_insert::match_and_insert(input)
}

#[proc_macro_derive(PalletError, attributes(codec))]
pub fn derive_pallet_error(input: TokenStream) -> TokenStream {
	pallet_error::derive_pallet_error(input)
}

/// Internal macro used by `frame_support` to create tt-call-compliant macros
#[proc_macro]
pub fn __create_tt_macro(input: TokenStream) -> TokenStream {
	tt_macro::create_tt_return_macro(input)
}

///
/// ---
///
/// Rust-Analyzer Users: Documentation for this macro can be found at
/// `frame_support::pallet_macros::storage_alias`.
#[proc_macro_attribute]
pub fn storage_alias(attributes: TokenStream, input: TokenStream) -> TokenStream {
	storage_alias::storage_alias(attributes.into(), input.into())
		.unwrap_or_else(|r| r.into_compile_error())
		.into()
}

/// This attribute can be used to derive a full implementation of a trait based on a local partial
/// impl and an external impl containing defaults that can be overriden in the local impl.
///
/// For a full end-to-end example, see [below](#use-case-auto-derive-test-pallet-config-traits).
///
/// # Usage
///
/// The attribute should be attached to an impl block (strictly speaking a `syn::ItemImpl`) for
/// which we want to inject defaults in the event of missing trait items in the block.
///
/// The attribute minimally takes a single `default_impl_path` argument, which should be the module
/// path to an impl registered via [`#[register_default_impl]`](`macro@register_default_impl`) that
/// contains the default trait items we want to potentially inject, with the general form:
///
/// ```ignore
/// #[derive_impl(default_impl_path)]
/// impl SomeTrait for SomeStruct {
///     ...
/// }
/// ```
///
/// Optionally, a `disambiguation_path` can be specified as follows by providing `as path::here`
/// after the `default_impl_path`:
///
/// ```ignore
/// #[derive_impl(default_impl_path as disambiguation_path)]
/// impl SomeTrait for SomeStruct {
///     ...
/// }
/// ```
///
/// The `disambiguation_path`, if specified, should be the path to a trait that will be used to
/// qualify all default entries that are injected into the local impl. For example if your
/// `default_impl_path` is `some::path::TestTraitImpl` and your `disambiguation_path` is
/// `another::path::DefaultTrait`, any items injected into the local impl will be qualified as
/// `<some::path::TestTraitImpl as another::path::DefaultTrait>::specific_trait_item`.
///
/// If you omit the `as disambiguation_path` portion, the `disambiguation_path` will internally
/// default to `A` from the `impl A for B` part of the default impl. This is useful for scenarios
/// where all of the relevant types are already in scope via `use` statements.
///
/// In case the `default_impl_path` is scoped to a different module such as
/// `some::path::TestTraitImpl`, the same scope is assumed for the `disambiguation_path`, i.e.
/// `some::A`. This enables the use of `derive_impl` attribute without having to specify the
/// `disambiguation_path` in most (if not all) uses within FRAME's context.
///
/// Conversely, the `default_impl_path` argument is required and cannot be omitted.
///
/// Optionally, `no_aggregated_types` can be specified as follows:
///
/// ```ignore
/// #[derive_impl(default_impl_path as disambiguation_path, no_aggregated_types)]
/// impl SomeTrait for SomeStruct {
///     ...
/// }
/// ```
///
/// If specified, this indicates that the aggregated types (as denoted by impl items
/// attached with [`#[inject_runtime_type]`]) should not be injected with the respective concrete
/// types. By default, all such types are injected.
///
/// You can also make use of `#[pallet::no_default]` on specific items in your default impl that you
/// want to ensure will not be copied over but that you nonetheless want to use locally in the
/// context of the foreign impl and the pallet (or context) in which it is defined.
///
/// ## Use-Case Example: Auto-Derive Test Pallet Config Traits
///
/// The `#[derive_imp(..)]` attribute can be used to derive a test pallet `Config` based on an
/// existing pallet `Config` that has been marked with
/// [`#[pallet::config(with_default)]`](`macro@config`) (which under the hood, generates a
/// `DefaultConfig` trait in the pallet in which the macro was invoked).
///
/// In this case, the `#[derive_impl(..)]` attribute should be attached to an `impl` block that
/// implements a compatible `Config` such as `frame_system::Config` for a test/mock runtime, and
/// should receive as its first argument the path to a `DefaultConfig` impl that has been registered
/// via [`#[register_default_impl]`](`macro@register_default_impl`), and as its second argument, the
/// path to the auto-generated `DefaultConfig` for the existing pallet `Config` we want to base our
/// test config off of.
///
/// The following is what the `basic` example pallet would look like with a default testing config:
///
/// ```ignore
/// #[derive_impl(frame_system::config_preludes::TestDefaultConfig as frame_system::pallet::DefaultConfig)]
/// impl frame_system::Config for Test {
///     // These are all defined by system as mandatory.
///     type BaseCallFilter = frame_support::traits::Everything;
///     type RuntimeEvent = RuntimeEvent;
///     type RuntimeCall = RuntimeCall;
///     type RuntimeOrigin = RuntimeOrigin;
///     type OnSetCode = ();
///     type PalletInfo = PalletInfo;
///     type Block = Block;
///     // We decide to override this one.
///     type AccountData = pallet_balances::AccountData<u64>;
/// }
/// ```
///
/// where `TestDefaultConfig` was defined and registered as follows:
/// ```ignore
/// pub struct TestDefaultConfig;
///
/// #[register_default_impl(TestDefaultConfig)]
/// impl DefaultConfig for TestDefaultConfig {
///     type Version = ();
///     type BlockWeights = ();
///     type BlockLength = ();
///     type DbWeight = ();
///     type Nonce = u64;
///     type BlockNumber = u64;
///     type Hash = sp_core::hash::H256;
///     type Hashing = sp_runtime::traits::BlakeTwo256;
///     type AccountId = AccountId;
///     type Lookup = IdentityLookup<AccountId>;
///     type BlockHashCount = frame_support::traits::ConstU64<10>;
///     type AccountData = u32;
///     type OnNewAccount = ();
///     type OnKilledAccount = ();
///     type SystemWeightInfo = ();
///     type SS58Prefix = ();
///     type MaxConsumers = frame_support::traits::ConstU32<16>;
/// }
/// ```
///
/// The above call to `derive_impl` would expand to roughly the following:
/// ```ignore
/// impl frame_system::Config for Test {
///     use frame_system::config_preludes::TestDefaultConfig;
///     use frame_system::pallet::DefaultConfig;
///
///     type BaseCallFilter = frame_support::traits::Everything;
///     type RuntimeEvent = RuntimeEvent;
///     type RuntimeCall = RuntimeCall;
///     type RuntimeOrigin = RuntimeOrigin;
///     type OnSetCode = ();
///     type PalletInfo = PalletInfo;
///     type Block = Block;
///     type AccountData = pallet_balances::AccountData<u64>;
///     type Version = <TestDefaultConfig as DefaultConfig>::Version;
///     type BlockWeights = <TestDefaultConfig as DefaultConfig>::BlockWeights;
///     type BlockLength = <TestDefaultConfig as DefaultConfig>::BlockLength;
///     type DbWeight = <TestDefaultConfig as DefaultConfig>::DbWeight;
///     type Nonce = <TestDefaultConfig as DefaultConfig>::Nonce;
///     type BlockNumber = <TestDefaultConfig as DefaultConfig>::BlockNumber;
///     type Hash = <TestDefaultConfig as DefaultConfig>::Hash;
///     type Hashing = <TestDefaultConfig as DefaultConfig>::Hashing;
///     type AccountId = <TestDefaultConfig as DefaultConfig>::AccountId;
///     type Lookup = <TestDefaultConfig as DefaultConfig>::Lookup;
///     type BlockHashCount = <TestDefaultConfig as DefaultConfig>::BlockHashCount;
///     type OnNewAccount = <TestDefaultConfig as DefaultConfig>::OnNewAccount;
///     type OnKilledAccount = <TestDefaultConfig as DefaultConfig>::OnKilledAccount;
///     type SystemWeightInfo = <TestDefaultConfig as DefaultConfig>::SystemWeightInfo;
///     type SS58Prefix = <TestDefaultConfig as DefaultConfig>::SS58Prefix;
///     type MaxConsumers = <TestDefaultConfig as DefaultConfig>::MaxConsumers;
/// }
/// ```
///
/// You can then use the resulting `Test` config in test scenarios.
///
/// Note that items that are _not_ present in our local `DefaultConfig` are automatically copied
/// from the foreign trait (in this case `TestDefaultConfig`) into the local trait impl (in this
/// case `Test`), unless the trait item in the local trait impl is marked with
/// [`#[pallet::no_default]`](`macro@no_default`), in which case it cannot be overridden, and any
/// attempts to do so will result in a compiler error.
///
/// See `frame/examples/default-config/tests.rs` for a runnable end-to-end example pallet that makes
/// use of `derive_impl` to derive its testing config.
///
/// See [here](`macro@config`) for more information and caveats about the auto-generated
/// `DefaultConfig` trait.
///
/// ## Optional Conventions
///
/// Note that as an optional convention, we encourage creating a `config_preludes` module inside of
/// your pallet. This is the convention we follow for `frame_system`'s `TestDefaultConfig` which, as
/// shown above, is located at `frame_system::config_preludes::TestDefaultConfig`. This is just a
/// suggested convention -- there is nothing in the code that expects modules with these names to be
/// in place, so there is no imperative to follow this pattern unless desired.
///
/// In `config_preludes`, you can place types named like:
///
/// * `TestDefaultConfig`
/// * `ParachainDefaultConfig`
/// * `SolochainDefaultConfig`
///
/// Signifying in which context they can be used.
///
/// # Advanced Usage
///
/// ## Expansion
///
/// The `#[derive_impl(default_impl_path as disambiguation_path)]` attribute will expand to the
/// local impl, with any extra items from the foreign impl that aren't present in the local impl
/// also included. In the case of a colliding trait item, the version of the item that exists in the
/// local impl will be retained. All imported items are qualified by the `disambiguation_path`, as
/// discussed above.
///
/// ## Handling of Unnamed Trait Items
///
/// Items that lack a `syn::Ident` for whatever reason are first checked to see if they exist,
/// verbatim, in the local/destination trait before they are copied over, so you should not need to
/// worry about collisions between identical unnamed items.
#[import_tokens_attr_verbatim {
    format!(
        "{}::macro_magic",
        match generate_access_from_frame_or_crate("frame-support") {
            Ok(path) => Ok(path),
            Err(_) => generate_access_from_frame_or_crate("frame"),
        }
        .expect("Failed to find either `frame-support` or `frame` in `Cargo.toml` dependencies.")
        .to_token_stream()
        .to_string()
    )
}]
#[with_custom_parsing(derive_impl::DeriveImplAttrArgs)]
#[proc_macro_attribute]
pub fn derive_impl(attrs: TokenStream, input: TokenStream) -> TokenStream {
	let custom_attrs = parse_macro_input!(__custom_tokens as derive_impl::DeriveImplAttrArgs);
	derive_impl::derive_impl(
		__source_path.into(),
		attrs.into(),
		input.into(),
		custom_attrs.disambiguation_path,
		custom_attrs.no_aggregated_types,
	)
	.unwrap_or_else(|r| r.into_compile_error())
	.into()
}

///
/// ---
///
/// Rust-Analyzer Users: Documentation for this macro can be found at
/// `frame_support::pallet_macros::no_default`.
#[proc_macro_attribute]
pub fn no_default(_: TokenStream, _: TokenStream) -> TokenStream {
	pallet_macro_stub()
}

///
/// ---
///
/// Rust-Analyzer Users: Documentation for this macro can be found at
/// `frame_support::pallet_macros::no_default_bounds`.
#[proc_macro_attribute]
pub fn no_default_bounds(_: TokenStream, _: TokenStream) -> TokenStream {
	pallet_macro_stub()
}

/// Attach this attribute to an impl statement that you want to use with
/// [`#[derive_impl(..)]`](`macro@derive_impl`).
///
/// You must also provide an identifier/name as the attribute's argument. This is the name you
/// must provide to [`#[derive_impl(..)]`](`macro@derive_impl`) when you import this impl via
/// the `default_impl_path` argument. This name should be unique at the crate-level.
///
/// ## Example
///
/// ```ignore
/// pub struct ExampleTestDefaultConfig;
///
/// #[register_default_impl(ExampleTestDefaultConfig)]
/// impl DefaultConfig for ExampleTestDefaultConfig {
/// 	type Version = ();
/// 	type BlockWeights = ();
/// 	type BlockLength = ();
/// 	...
/// 	type SS58Prefix = ();
/// 	type MaxConsumers = frame_support::traits::ConstU32<16>;
/// }
/// ```
///
/// ## Advanced Usage
///
/// This macro acts as a thin wrapper around macro_magic's `#[export_tokens]`. See the docs
/// [here](https://docs.rs/macro_magic/latest/macro_magic/attr.export_tokens.html) for more
/// info.
///
/// There are some caveats when applying a `use` statement to bring a
/// `#[register_default_impl]` item into scope. If you have a `#[register_default_impl]`
/// defined in `my_crate::submodule::MyItem`, it is currently not sufficient to do something
/// like:
///
/// ```ignore
/// use my_crate::submodule::MyItem;
/// #[derive_impl(MyItem as Whatever)]
/// ```
///
/// This will fail with a mysterious message about `__export_tokens_tt_my_item` not being
/// defined.
///
/// You can, however, do any of the following:
/// ```ignore
/// // partial path works
/// use my_crate::submodule;
/// #[derive_impl(submodule::MyItem as Whatever)]
/// ```
/// ```ignore
/// // full path works
/// #[derive_impl(my_crate::submodule::MyItem as Whatever)]
/// ```
/// ```ignore
/// // wild-cards work
/// use my_crate::submodule::*;
/// #[derive_impl(MyItem as Whatever)]
/// ```
#[proc_macro_attribute]
pub fn register_default_impl(attrs: TokenStream, tokens: TokenStream) -> TokenStream {
	// ensure this is a impl statement
	let item_impl = syn::parse_macro_input!(tokens as ItemImpl);

	// internally wrap macro_magic's `#[export_tokens]` macro
	match macro_magic::mm_core::export_tokens_internal(
		attrs,
		item_impl.to_token_stream(),
		true,
		false,
	) {
		Ok(tokens) => tokens.into(),
		Err(err) => err.to_compile_error().into(),
	}
}

///
/// ---
///
/// Rust-Analyzer Users: Documentation for this macro can be found at
/// `frame_support::pallet_prelude::inject_runtime_type`.
#[proc_macro_attribute]
pub fn inject_runtime_type(_: TokenStream, tokens: TokenStream) -> TokenStream {
	let item = tokens.clone();
	let item = syn::parse_macro_input!(item as TraitItemType);
	if item.ident != "RuntimeCall" &&
		item.ident != "RuntimeEvent" &&
		item.ident != "RuntimeTask" &&
		item.ident != "RuntimeOrigin" &&
		item.ident != "RuntimeHoldReason" &&
		item.ident != "RuntimeFreezeReason" &&
		item.ident != "RuntimeParameters" &&
		item.ident != "PalletInfo"
	{
		return syn::Error::new_spanned(
			item,
			"`#[inject_runtime_type]` can only be attached to `RuntimeCall`, `RuntimeEvent`, \
			`RuntimeTask`, `RuntimeOrigin`, `RuntimeParameters` or `PalletInfo`",
		)
		.to_compile_error()
		.into()
	}
	tokens
}

/// Used internally to decorate pallet attribute macro stubs when they are erroneously used
/// outside of a pallet module
fn pallet_macro_stub() -> TokenStream {
	quote!(compile_error!(
		"This attribute can only be used from within a pallet module marked with `#[frame_support::pallet]`"
	))
	.into()
}

///
/// ---
///
/// Rust-Analyzer Users: Documentation for this macro can be found at
/// `frame_support::pallet_macros::config`.
#[proc_macro_attribute]
pub fn config(_: TokenStream, _: TokenStream) -> TokenStream {
	pallet_macro_stub()
}

///
/// ---
///
/// Rust-Analyzer Users: Documentation for this macro can be found at
/// `frame_support::pallet_macros::constant`.
#[proc_macro_attribute]
pub fn constant(_: TokenStream, _: TokenStream) -> TokenStream {
	pallet_macro_stub()
}

///
/// ---
///
/// Rust-Analyzer Users: Documentation for this macro can be found at
/// `frame_support::pallet_macros::constant_name`.
#[proc_macro_attribute]
pub fn constant_name(_: TokenStream, _: TokenStream) -> TokenStream {
	pallet_macro_stub()
}

///
/// ---
///
/// Rust-Analyzer Users: Documentation for this macro can be found at
/// `frame_support::pallet_macros::disable_frame_system_supertrait_check`.
#[proc_macro_attribute]
pub fn disable_frame_system_supertrait_check(_: TokenStream, _: TokenStream) -> TokenStream {
	pallet_macro_stub()
}

///
/// ---
///
/// Rust-Analyzer Users: Documentation for this macro can be found at
/// `frame_support::pallet_macros::generate_store`.
#[proc_macro_attribute]
pub fn generate_store(_: TokenStream, _: TokenStream) -> TokenStream {
	pallet_macro_stub()
}

///
/// ---
///
/// Rust-Analyzer Users: Documentation for this macro can be found at
/// `frame_support::pallet_macros::storage_version`.
#[proc_macro_attribute]
pub fn storage_version(_: TokenStream, _: TokenStream) -> TokenStream {
	pallet_macro_stub()
}

///
/// ---
///
/// Rust-Analyzer Users: Documentation for this macro can be found at
/// `frame_support::pallet_macros::hooks`.
#[proc_macro_attribute]
pub fn hooks(_: TokenStream, _: TokenStream) -> TokenStream {
	pallet_macro_stub()
}

///
/// ---
///
/// Rust-Analyzer Users: Documentation for this macro can be found at
/// `frame_support::pallet_macros::weight`.
#[proc_macro_attribute]
pub fn weight(_: TokenStream, _: TokenStream) -> TokenStream {
	pallet_macro_stub()
}

///
/// ---
///
/// Rust-Analyzer Users: Documentation for this macro can be found at
/// `frame_support::pallet_macros::compact`.
#[proc_macro_attribute]
pub fn compact(_: TokenStream, _: TokenStream) -> TokenStream {
	pallet_macro_stub()
}

///
/// ---
///
/// Rust-Analyzer Users: Documentation for this macro can be found at
/// `frame_support::pallet_macros::call`.
#[proc_macro_attribute]
pub fn call(_: TokenStream, _: TokenStream) -> TokenStream {
	pallet_macro_stub()
}

/// Each dispatchable may also be annotated with the `#[pallet::call_index($idx)]` attribute,
/// which explicitly defines the codec index for the dispatchable function in the `Call` enum.
///
/// ---
///
/// Rust-Analyzer Users: Documentation for this macro can be found at
/// `frame_support::pallet_macros::call_index`.
#[proc_macro_attribute]
pub fn call_index(_: TokenStream, _: TokenStream) -> TokenStream {
	pallet_macro_stub()
}

///
/// ---
///
/// Rust-Analyzer Users: Documentation for this macro can be found at
///
/// `frame_support::pallet_macros::feeless_if`.
#[proc_macro_attribute]
pub fn feeless_if(_: TokenStream, _: TokenStream) -> TokenStream {
	pallet_macro_stub()
}

///
/// ---
///
/// Rust-Analyzer Users: Documentation for this macro can be found at
///
/// `frame_support::pallet_macros::extra_constants`.
#[proc_macro_attribute]
pub fn extra_constants(_: TokenStream, _: TokenStream) -> TokenStream {
	pallet_macro_stub()
}

///
/// ---
///
/// Rust-Analyzer Users: Documentation for this macro can be found at
/// `frame_support::pallet_macros::error`.
#[proc_macro_attribute]
pub fn error(_: TokenStream, _: TokenStream) -> TokenStream {
	pallet_macro_stub()
}

///
/// ---
///
/// Rust-Analyzer Users: Documentation for this macro can be found at
/// `frame_support::pallet_macros::event`.
#[proc_macro_attribute]
pub fn event(_: TokenStream, _: TokenStream) -> TokenStream {
	pallet_macro_stub()
}

///
/// ---
///
/// Rust-Analyzer Users: Documentation for this macro can be found at
/// `frame_support::pallet_macros::generate_deposit`.
#[proc_macro_attribute]
pub fn generate_deposit(_: TokenStream, _: TokenStream) -> TokenStream {
	pallet_macro_stub()
}

///
/// ---
///
/// Rust-Analyzer Users: Documentation for this macro can be found at
/// `frame_support::pallet_macros::storage`.
#[proc_macro_attribute]
pub fn storage(_: TokenStream, _: TokenStream) -> TokenStream {
	pallet_macro_stub()
}

///
/// ---
///
/// Rust-Analyzer Users: Documentation for this macro can be found at
/// `frame_support::pallet_macros::getter`.
#[proc_macro_attribute]
pub fn getter(_: TokenStream, _: TokenStream) -> TokenStream {
	pallet_macro_stub()
}

///
/// ---
///
/// Rust-Analyzer Users: Documentation for this macro can be found at
/// `frame_support::pallet_macros::storage_prefix`.
#[proc_macro_attribute]
pub fn storage_prefix(_: TokenStream, _: TokenStream) -> TokenStream {
	pallet_macro_stub()
}

///
/// ---
///
/// Rust-Analyzer Users: Documentation for this macro can be found at
/// `frame_support::pallet_macros::unbounded`.
#[proc_macro_attribute]
pub fn unbounded(_: TokenStream, _: TokenStream) -> TokenStream {
	pallet_macro_stub()
}

///
/// ---
///
/// Rust-Analyzer Users: Documentation for this macro can be found at
/// `frame_support::pallet_macros::whitelist_storage`.
#[proc_macro_attribute]
pub fn whitelist_storage(_: TokenStream, _: TokenStream) -> TokenStream {
	pallet_macro_stub()
}

///
/// ---
///
/// Rust-Analyzer Users: Documentation for this macro can be found at
/// `frame_support::pallet_macros::disable_try_decode_storage`.
#[proc_macro_attribute]
pub fn disable_try_decode_storage(_: TokenStream, _: TokenStream) -> TokenStream {
	pallet_macro_stub()
}

///
/// ---
///
/// Rust-Analyzer Users: Documentation for this macro can be found at
/// `frame_support::pallet_macros::type_value`.
#[proc_macro_attribute]
pub fn type_value(_: TokenStream, _: TokenStream) -> TokenStream {
	pallet_macro_stub()
}

///
/// ---
///
/// Rust-Analyzer Users: Documentation for this macro can be found at
/// `frame_support::pallet_macros::genesis_config`.
#[proc_macro_attribute]
pub fn genesis_config(_: TokenStream, _: TokenStream) -> TokenStream {
	pallet_macro_stub()
}

///
/// ---
///
/// Rust-Analyzer Users: Documentation for this macro can be found at
/// `frame_support::pallet_macros::genesis_build`.
#[proc_macro_attribute]
pub fn genesis_build(_: TokenStream, _: TokenStream) -> TokenStream {
	pallet_macro_stub()
}

///
/// ---
///
/// Rust-Analyzer Users: Documentation for this macro can be found at
/// `frame_support::pallet_macros::inherent`.
#[proc_macro_attribute]
pub fn inherent(_: TokenStream, _: TokenStream) -> TokenStream {
	pallet_macro_stub()
}

///
/// ---
///
/// Rust-Analyzer Users: Documentation for this macro can be found at
/// `frame_support::pallet_macros::validate_unsigned`.
#[proc_macro_attribute]
pub fn validate_unsigned(_: TokenStream, _: TokenStream) -> TokenStream {
	pallet_macro_stub()
}

///
/// ---
///
/// Rust-Analyzer Users: Documentation for this macro can be found at
/// `frame_support::pallet_macros::origin`.
#[proc_macro_attribute]
pub fn origin(_: TokenStream, _: TokenStream) -> TokenStream {
	pallet_macro_stub()
}

///
/// ---
///
/// Rust-Analyzer Users: Documentation for this macro can be found at
/// `frame_support::pallet_macros::composite_enum`.
#[proc_macro_attribute]
pub fn composite_enum(_: TokenStream, _: TokenStream) -> TokenStream {
	pallet_macro_stub()
}

///
/// ---
///
/// **Rust-Analyzer users**: See the documentation of the Rust item in
/// `frame_support::pallet_macros::tasks_experimental`.
#[proc_macro_attribute]
pub fn tasks_experimental(_: TokenStream, _: TokenStream) -> TokenStream {
	pallet_macro_stub()
}

///
/// ---
///
/// **Rust-Analyzer users**: See the documentation of the Rust item in
/// `frame_support::pallet_macros::task_list`.
#[proc_macro_attribute]
pub fn task_list(_: TokenStream, _: TokenStream) -> TokenStream {
	pallet_macro_stub()
}

///
/// ---
///
/// **Rust-Analyzer users**: See the documentation of the Rust item in
/// `frame_support::pallet_macros::task_condition`.
#[proc_macro_attribute]
pub fn task_condition(_: TokenStream, _: TokenStream) -> TokenStream {
	pallet_macro_stub()
}

///
/// ---
///
/// **Rust-Analyzer users**: See the documentation of the Rust item in
/// `frame_support::pallet_macros::task_weight`.
#[proc_macro_attribute]
pub fn task_weight(_: TokenStream, _: TokenStream) -> TokenStream {
	pallet_macro_stub()
}

///
/// ---
///
/// **Rust-Analyzer users**: See the documentation of the Rust item in
/// `frame_support::pallet_macros::task_index`.
#[proc_macro_attribute]
pub fn task_index(_: TokenStream, _: TokenStream) -> TokenStream {
	pallet_macro_stub()
}

///
/// ---
///
/// **Rust-Analyzer users**: See the documentation of the Rust item in
/// `frame_support::pallet_macros::pallet_section`.
#[proc_macro_attribute]
pub fn pallet_section(attr: TokenStream, tokens: TokenStream) -> TokenStream {
	let tokens_clone = tokens.clone();
	// ensure this can only be attached to a module
	let _mod = parse_macro_input!(tokens_clone as ItemMod);

	// use macro_magic's export_tokens as the internal implementation otherwise
	match macro_magic::mm_core::export_tokens_internal(attr, tokens, false, true) {
		Ok(tokens) => tokens.into(),
		Err(err) => err.to_compile_error().into(),
	}
}

///
/// ---
///
/// **Rust-Analyzer users**: See the documentation of the Rust item in
/// `frame_support::pallet_macros::import_section`.
#[import_tokens_attr {
    format!(
        "{}::macro_magic",
        match generate_access_from_frame_or_crate("frame-support") {
            Ok(path) => Ok(path),
            Err(_) => generate_access_from_frame_or_crate("frame"),
        }
        .expect("Failed to find either `frame-support` or `frame` in `Cargo.toml` dependencies.")
        .to_token_stream()
        .to_string()
    )
}]
#[proc_macro_attribute]
pub fn import_section(attr: TokenStream, tokens: TokenStream) -> TokenStream {
	let foreign_mod = parse_macro_input!(attr as ItemMod);
	let mut internal_mod = parse_macro_input!(tokens as ItemMod);

	// check that internal_mod is a pallet module
	if !internal_mod.attrs.iter().any(|attr| {
		if let Some(last_seg) = attr.path().segments.last() {
			last_seg.ident == "pallet"
		} else {
			false
		}
	}) {
		return Error::new(
			internal_mod.ident.span(),
			"`#[import_section]` can only be applied to a valid pallet module",
		)
		.to_compile_error()
		.into()
	}

	if let Some(ref mut content) = internal_mod.content {
		if let Some(foreign_content) = foreign_mod.content {
			content.1.extend(foreign_content.1);
		}
	}

	quote! {
		#internal_mod
	}
	.into()
}

/// Mark a module that contains dynamic parameters.
///
/// See the `pallet_parameters` for a full example.
///
/// # Arguments
///
/// The macro accepts two positional arguments, of which the second is optional.
///
/// ## Aggregated Enum Name
///
/// This sets the name that the aggregated Key-Value enum will be named after. Common names would be
/// `RuntimeParameters`, akin to `RuntimeCall`, `RuntimeOrigin` etc. There is no default value for
/// this argument.
///
/// ## Parameter Storage Backend
///
/// The second argument provides access to the storage of the parameters. It can either be set on
/// on this attribute, or on the inner ones. If set on both, the inner one takes precedence.
#[proc_macro_attribute]
pub fn dynamic_params(attrs: TokenStream, input: TokenStream) -> TokenStream {
	dynamic_params::dynamic_params(attrs.into(), input.into())
		.unwrap_or_else(|r| r.into_compile_error())
		.into()
}

/// Define a module inside a [`macro@dynamic_params`] module that contains dynamic parameters.
///
/// See the `pallet_parameters` for a full example.
///
/// # Argument
///
/// This attribute takes one optional argument. The argument can either be put here or on the
/// surrounding `#[dynamic_params]` attribute. If set on both, the inner one takes precedence.
#[proc_macro_attribute]
pub fn dynamic_pallet_params(attrs: TokenStream, input: TokenStream) -> TokenStream {
	dynamic_params::dynamic_pallet_params(attrs.into(), input.into())
		.unwrap_or_else(|r| r.into_compile_error())
		.into()
}

/// Used internally by [`dynamic_params`].
#[doc(hidden)]
#[proc_macro_attribute]
pub fn dynamic_aggregated_params_internal(attrs: TokenStream, input: TokenStream) -> TokenStream {
	dynamic_params::dynamic_aggregated_params_internal(attrs.into(), input.into())
		.unwrap_or_else(|r| r.into_compile_error())
		.into()
}