about summary refs log tree commit diff stats
path: root/archive/2.vm/050scenario.cc
blob: 5b9dcc14c3d27b89926afda32b6f59e31c49efe6 (plain) (blame)
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
//: Mu scenarios. This will get long, but these are the tests we want to
//: support in this layer.

//: We avoid raw numeric locations in Mu -- except in scenarios, where they're
//: handy to check the values of specific variables

void test_scenario_block() {
  run_mu_scenario(
      "scenario foo [\n"
      "  run [\n"
      "    1:num <- copy 13\n"
      "  ]\n"
      "  memory-should-contain [\n"
      "    1 <- 13\n"
      "  ]\n"
      "]\n"
  );
  // checks are inside scenario
}

void test_scenario_multiple_blocks() {
  run_mu_scenario(
      "scenario foo [\n"
      "  run [\n"
      "    1:num <- copy 13\n"
      "  ]\n"
      "  memory-should-contain [\n"
      "    1 <- 13\n"
      "  ]\n"
      "  run [\n"
      "    2:num <- copy 13\n"
      "  ]\n"
      "  memory-should-contain [\n"
      "    1 <- 13\n"
      "    2 <- 13\n"
      "  ]\n"
      "]\n"
  );
  // checks are inside scenario
}

void test_scenario_check_memory_and_trace() {
  run_mu_scenario(
      "scenario foo [\n"
      "  run [\n"
      "    1:num <- copy 13\n"
      "    trace 1, [a], [a b c]\n"
      "  ]\n"
      "  memory-should-contain [\n"
      "    1 <- 13\n"
      "  ]\n"
      "  trace-should-contain [\n"
      "    a: a b c\n"
      "  ]\n"
      "  trace-should-not-contain [\n"
      "    a: x y z\n"
      "  ]\n"
      "]\n"
  );
  // checks are inside scenario
}

//:: Core data structure

:(before "End Types")
struct scenario {
  string name;
  string to_run;
  void clear() {
    name.clear();
    to_run.clear();
  }
};

:(before "End Globals")
vector<scenario> Scenarios, Scenarios_snapshot;
set<string> Scenario_names, Scenario_names_snapshot;
:(before "End save_snapshots")
Scenarios_snapshot = Scenarios;
Scenario_names_snapshot = Scenario_names;
:(before "End restore_snapshots")
Scenarios = Scenarios_snapshot;
Scenario_names = Scenario_names_snapshot;

//:: Parse the 'scenario' form.
//: Simply store the text of the scenario.

:(before "End Command Handlers")
else if (command == "scenario") {
  scenario result = parse_scenario(in);
  if (!result.name.empty())
    Scenarios.push_back(result);
}
else if (command == "pending-scenario") {
  // for temporary use only
  parse_scenario(in);  // discard
}

:(code)
scenario parse_scenario(istream& in) {
  scenario result;
  result.name = next_word(in);
  if (contains_key(Scenario_names, result.name))
    raise << "duplicate scenario name: '" << result.name << "'\n" << end();
  Scenario_names.insert(result.name);
  if (result.name.empty()) {
    assert(!has_data(in));
    raise << "incomplete scenario at end of file\n" << end();
    return result;
  }
  skip_whitespace_and_comments(in);
  if (in.peek() != '[') {
    raise << "Expected '[' after scenario '" << result.name << "'\n" << end();
    exit(0);
  }
  // scenarios are take special 'code' strings so we need to ignore brackets
  // inside comments
  result.to_run = slurp_quoted(in);
  // delete [] delimiters
  if (!starts_with(result.to_run, "[")) {
    raise << "scenario " << result.name << " should start with '['\n" << end();
    result.clear();
    return result;
  }
  result.to_run.erase(0, 1);
  if (result.to_run.at(SIZE(result.to_run)-1) != ']') {
    raise << "scenario " << result.name << " has an unbalanced '['\n" << end();
    result.clear();
    return result;
  }
  result.to_run.erase(SIZE(result.to_run)-1);
  return result;
}

void test_read_scenario_with_bracket_in_comment() {
  run_mu_scenario(
      "scenario foo [\n"
      "  # ']' in comment\n"
      "  1:num <- copy 0\n"
      "]\n"
  );
  CHECK_TRACE_CONTENTS(
      "run: {1: \"number\"} <- copy {0: \"literal\"}\n"
  );
}

void test_read_scenario_with_bracket_in_comment_in_nested_string() {
  run_mu_scenario(
      "scenario foo [\n"
      "  1:text <- new [# not a comment]\n"
      "]\n"
  );
  CHECK_TRACE_CONTENTS(
      "run: {1: (\"address\" \"array\" \"character\")} <- new {\"# not a comment\": \"literal-string\"}\n"
  );
}

void test_duplicate_scenarios() {
  Hide_errors = true;
  run(
      "scenario foo [\n"
      "  1:num <- copy 0\n"
      "]\n"
      "scenario foo [\n"
      "  2:num <- copy 0\n"
      "]\n"
  );
  CHECK_TRACE_CONTENTS(
      "error: duplicate scenario name: 'foo'\n"
  );
}

//:: Run scenarios when we run './mu test'.
//: Treat the text of the scenario as a regular series of instructions.

:(before "End Globals")
int Num_core_mu_scenarios = 0;
:(after "Check For .mu Files")
Num_core_mu_scenarios = SIZE(Scenarios);
:(before "End Tests")
Hide_missing_default_space_errors = false;
if (Num_core_mu_scenarios > 0) {
  time(&t);
  cerr << "Mu tests: " << ctime(&t);
  for (int i = 0;  i < Num_core_mu_scenarios;  ++i) {
//?     cerr << '\n' << i << ": " << Scenarios.at(i).name;
    run_mu_scenario(Scenarios.at(i));
    if (Passed) cerr << ".";
    else ++num_failures;
  }
  cerr << "\n";
}
run_app_scenarios:
if (Num_core_mu_scenarios != SIZE(Scenarios)) {
  time(&t);
  cerr << "App tests: " << ctime(&t);
  for (int i = Num_core_mu_scenarios;  i < SIZE(Scenarios);  ++i) {
//?     cerr << '\n' << i << ": " << Scenarios.at(i).name;
    run_mu_scenario(Scenarios.at(i));
    if (Passed) cerr << ".";
    else ++num_failures;
  }
  cerr << "\n";
}

//: For faster debugging, support running tests for just the Mu app(s) we are
//: loading.
:(before "End Globals")
bool Test_only_app = false;
:(before "End Commandline Options(*arg)")
else if (is_equal(*arg, "--test-only-app")) {
  Test_only_app = true;
}
:(after "End Test Run Initialization")
if (Test_only_app && Num_core_mu_scenarios < SIZE(Scenarios)) {
  goto run_app_scenarios;
}

//: Convenience: run a single named scenario.
:(after "Test Runs")
for (int i = 0;  i < SIZE(Scenarios);  ++i) {
  if (Scenarios.at(i).name == argv[argc-1]) {
    run_mu_scenario(Scenarios.at(i));
    if (Passed) cerr << ".\n";
    return 0;
  }
}

:(before "End Globals")
// this isn't a constant, just a global of type const*
const scenario* Current_scenario = NULL;
:(code)
void run_mu_scenario(const scenario& s) {
  Current_scenario = &s;
  bool not_already_inside_test = !Trace_stream;
//?   cerr << s.name << '\n';
  if (not_already_inside_test) {
    Trace_stream = new trace_stream;
    reset();
  }
  vector<recipe_ordinal> tmp = load("recipe scenario_"+s.name+" [ "+s.to_run+" ]");
  mark_autogenerated(tmp.at(0));
  bind_special_scenario_names(tmp.at(0));
  transform_all();
  if (!trace_contains_errors())
    run(tmp.front());
  // End Mu Test Teardown
  if (!Hide_errors && trace_contains_errors() && !Scenario_testing_scenario)
    Passed = false;
  if (not_already_inside_test && Trace_stream) {
    delete Trace_stream;
    Trace_stream = NULL;
  }
  Current_scenario = NULL;
}

//: Permit numeric locations to be accessed in scenarios.
:(before "End check_default_space Special-cases")
// user code should never create recipes with underscores in their names
if (starts_with(caller.name, "scenario_")) return;  // skip Mu scenarios which will use raw memory locations
if (starts_with(caller.name, "run_")) return;  // skip calls to 'run', which should be in scenarios and will also use raw memory locations

:(before "End maybe(recipe_name) Special-cases")
if (starts_with(recipe_name, "scenario_"))
  return recipe_name.substr(strlen("scenario_")) + ": ";

//: Some variables for fake resources always get special /raw addresses in scenarios.

:(code)
// Should contain everything passed by is_special_name but failed by is_disqualified.
void bind_special_scenario_names(const recipe_ordinal r) {
  // Special Scenario Variable Names(r)
  // End Special Scenario Variable Names(r)
}
:(before "Done Placing Ingredient(ingredient, inst, caller)")
maybe_make_raw(ingredient, caller);
:(before "Done Placing Product(product, inst, caller)")
maybe_make_raw(product, caller);
:(code)
void maybe_make_raw(reagent& r, const recipe& caller) {
  if (!is_special_name(r.name)) return;
  if (starts_with(caller.name, "scenario_"))
    r.properties.push_back(pair<string, string_tree*>("raw", NULL));
  // End maybe_make_raw
}

//: Test with some setup.
:(before "End is_special_name Special-cases")
if (s == "__maybe_make_raw_test__") return true;
:(before "End Special Scenario Variable Names(r)")
//: ugly: we only need this for this one test, but need to define it for all time
Name[r]["__maybe_make_raw_test__"] = Reserved_for_tests-1;
:(code)
void test_maybe_make_raw() {
  // check that scenarios can use local-scope and special variables together
  vector<recipe_ordinal> tmp = load(
      "def scenario_foo [\n"
      "  local-scope\n"
      "  __maybe_make_raw_test__:num <- copy 34\n"
      "]\n");
  mark_autogenerated(tmp.at(0));
  bind_special_scenario_names(tmp.at(0));
  transform_all();
  run(tmp.at(0));
  CHECK_TRACE_DOESNT_CONTAIN_ERRORS();
}

//: Watch out for redefinitions of scenario routines. We should never ever be
//: doing that, regardless of anything else.

void test_forbid_redefining_scenario_even_if_forced() {
  Hide_errors = true;
  Disable_redefine_checks = true;
  run(
      "def scenario-foo [\n"
      "  1:num <- copy 34\n"
      "]\n"
      "def scenario-foo [\n"
      "  1:num <- copy 35\n"
      "]\n"
  );
  CHECK_TRACE_CONTENTS(
      "error: redefining recipe scenario-foo\n"
  );
}

void test_scenario_containing_parse_error() {
  Hide_errors = true;
  run(
      "scenario foo [\n"
      "  memory-should-contain [\n"
      "    1 <- 0\n"
         // missing ']'
      "]\n"
  );
  // no crash
}

void test_scenario_containing_transform_error() {
  Hide_errors = true;
  run(
      "def main [\n"
      "  local-scope\n"
      "  add x, 1\n"
      "]\n"
  );
  // no crash
}

:(after "bool should_check_for_redefine(const string& recipe_name)")
  if (recipe_name.find("scenario-") == 0) return true;

//:: The special instructions we want to support inside scenarios.
//: These are easy to support in an interpreter, but will require more work
//: when we eventually build a compiler.

//: 'run' is a purely lexical convenience to separate the code actually being
//: tested from any setup

:(code)
void test_run() {
  run(
      "def main [\n"
      "  run [\n"
      "    1:num <- copy 13\n"
      "  ]\n"
      "]\n"
  );
  CHECK_TRACE_CONTENTS(
      "mem: storing 13 in location 1\n"
  );
}

:(before "End Rewrite Instruction(curr, recipe result)")
if (curr.name == "run") {
  // Just inline all instructions inside the run block in the containing
  // recipe. 'run' is basically a comment; pretend it doesn't exist.
  istringstream in2("[\n"+curr.ingredients.at(0).name+"\n]\n");
  slurp_body(in2, result);
  curr.clear();
}

:(code)
void test_run_multiple() {
  run(
      "def main [\n"
      "  run [\n"
      "    1:num <- copy 13\n"
      "  ]\n"
      "  run [\n"
      "    2:num <- copy 13\n"
      "  ]\n"
      "]\n"
  );
  CHECK_TRACE_CONTENTS(
      "mem: storing 13 in location 1\n"
      "mem: storing 13 in location 2\n"
  );
}

//: 'memory-should-contain' raises errors if specific locations aren't as expected
//: Also includes some special support for checking Mu texts.

:(before "End Globals")
bool Scenario_testing_scenario = false;
:(before "End Reset")
Scenario_testing_scenario = false;

:(code)
void test_memory_check() {
  Scenario_testing_scenario = true;
  Hide_errors = true;
  run(
      "def main [\n"
      "  memory-should-contain [\n"
      "    1 <- 13\n"
      "  ]\n"
      "]\n"
  );
  CHECK_TRACE_CONTENTS(
      "run: checking location 1\n"
      "error: F - main: expected location '1' to contain 13 but saw 0\n"
  );
}

:(before "End Primitive Recipe Declarations")
MEMORY_SHOULD_CONTAIN,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "memory-should-contain", MEMORY_SHOULD_CONTAIN);
:(before "End Primitive Recipe Checks")
case MEMORY_SHOULD_CONTAIN: {
  break;
}
:(before "End Primitive Recipe Implementations")
case MEMORY_SHOULD_CONTAIN: {
  if (!Passed) break;
  check_memory(current_instruction().ingredients.at(0).name);
  break;
}

:(code)
void check_memory(const string& s) {
  istringstream in(s);
  in >> std::noskipws;
  set<int> locations_checked;
  while (true) {
    skip_whitespace_and_comments(in);
    if (!has_data(in)) break;
    string lhs = next_word(in);
    if (lhs.empty()) {
      assert(!has_data(in));
      raise << maybe(current_recipe_name()) << "incomplete 'memory-should-contain' block at end of file (0)\n" << end();
      return;
    }
    if (!is_integer(lhs)) {
      check_type(lhs, in);
      continue;
    }
    int address = to_integer(lhs);
    skip_whitespace_and_comments(in);
    string _assign;  in >> _assign;  assert(_assign == "<-");
    skip_whitespace_and_comments(in);
    string rhs = next_word(in);
    if (rhs.empty()) {
      assert(!has_data(in));
      raise << maybe(current_recipe_name()) << "incomplete 'memory-should-contain' block at end of file (1)\n" << end();
      return;
    }
    if (!is_integer(rhs) && !is_noninteger(rhs)) {
      if (!Hide_errors) cerr << '\n';
      raise << "F - " << maybe(current_recipe_name()) << "location '" << address << "' can't contain non-number " << rhs << '\n' << end();
      if (!Scenario_testing_scenario) Passed = false;
      return;
    }
    double value = to_double(rhs);
    if (contains_key(locations_checked, address))
      raise << maybe(current_recipe_name()) << "duplicate expectation for location '" << address << "'\n" << end();
    trace(Callstack_depth+1, "run") << "checking location " << address << end();
    if (get_or_insert(Memory, address) != value) {
      if (!Hide_errors) cerr << '\n';
      raise << "F - " << maybe(current_recipe_name()) << "expected location '" << address << "' to contain " << no_scientific(value) << " but saw " << no_scientific(get_or_insert(Memory, address)) << '\n' << end();
      if (!Scenario_testing_scenario) Passed = false;
      return;
    }
    locations_checked.insert(address);
  }
}

void check_type(const string& lhs, istream& in) {
  reagent x(lhs);
  if (is_mu_array(x.type) && is_mu_character(array_element(x.type))) {
    x.set_value(to_integer(x.name));
    skip_whitespace_and_comments(in);
    string _assign = next_word(in);
    if (_assign.empty()) {
      assert(!has_data(in));
      raise << maybe(current_recipe_name()) << "incomplete 'memory-should-contain' block at end of file (2)\n" << end();
      return;
    }
    assert(_assign == "<-");
    skip_whitespace_and_comments(in);
    string literal = next_word(in);
    if (literal.empty()) {
      assert(!has_data(in));
      raise << maybe(current_recipe_name()) << "incomplete 'memory-should-contain' block at end of file (3)\n" << end();
      return;
    }
    int address = x.value;
    // exclude quoting brackets
    if (*literal.begin() != '[') {
      raise << maybe(current_recipe_name()) << "array:character types inside 'memory-should-contain' can only be compared with text literals surrounded by [], not '" << literal << "'\n" << end();
      return;
    }
    literal.erase(literal.begin());
    assert(*--literal.end() == ']');  literal.erase(--literal.end());
    check_mu_text(address, literal);
    return;
  }
  // End Scenario Type Special-cases
  raise << "don't know how to check memory for '" << lhs << "'\n" << end();
}

void check_mu_text(int start, const string& literal) {
  trace(Callstack_depth+1, "run") << "checking text length at " << start << end();
  int array_length = static_cast<int>(get_or_insert(Memory, start));
  if (array_length != SIZE(literal)) {
    if (!Hide_errors) cerr << '\n';
    raise << "F - " << maybe(current_recipe_name()) << "expected location '" << start << "' to contain length " << SIZE(literal) << " of text [" << literal << "] but saw " << array_length << " (for text [" << read_mu_characters(start+/*skip length*/1, array_length) << "])\n" << end();
    if (!Scenario_testing_scenario) Passed = false;
    return;
  }
  int curr = start+1;  // now skip length
  for (int i = 0;  i < SIZE(literal);  ++i) {
    trace(Callstack_depth+1, "run") << "checking location " << curr+i << end();
    if (get_or_insert(Memory, curr+i) != literal.at(i)) {
      if (!Hide_errors) cerr << '\n';
      raise << "F - " << maybe(current_recipe_name()) << "expected location " << (curr+i) << " to contain " << literal.at(i) << " but saw " << no_scientific(get_or_insert(Memory, curr+i)) << '\n' << end();
      if (!Scenario_testing_scenario) Passed = false;
      return;
    }
  }
}

void test_memory_check_multiple() {
  Scenario_testing_scenario = true;
  Hide_errors = true;
  run(
      "def main [\n"
      "  memory-should-contain [\n"
      "    1 <- 0\n"
      "    1 <- 0\n"
      "  ]\n"
      "]\n"
  );
  CHECK_TRACE_CONTENTS(
      "error: main: duplicate expectation for location '1'\n"
  );
}

void test_memory_check_mu_text_length() {
  Scenario_testing_scenario = true;
  Hide_errors = true;
  run(
      "def main [\n"
      "  1:num <- copy 3\n"
      "  2:num <- copy 97  # 'a'\n"
      "  3:num <- copy 98  # 'b'\n"
      "  4:num <- copy 99  # 'c'\n"
      "  memory-should-contain [\n"
      "    1:array:character <- [ab]\n"
      "  ]\n"
      "]\n"
  );
  CHECK_TRACE_CONTENTS(
      "error: F - main: expected location '1' to contain length 2 of text [ab] but saw 3 (for text [abc])\n"
  );
}

void test_memory_check_mu_text() {
  run(
      "def main [\n"
      "  1:num <- copy 3\n"
      "  2:num <- copy 97\n"  // 'a'
      "  3:num <- copy 98\n"  // 'b'
      "  4:num <- copy 99\n"  // 'c'
      "  memory-should-contain [\n"
      "    1:array:character <- [abc]\n"
      "  ]\n"
      "]\n"
  );
  CHECK_TRACE_CONTENTS(
      "run: checking text length at 1\n"
      "run: checking location 2\n"
      "run: checking location 3\n"
      "run: checking location 4\n"
  );
}

void test_memory_invalid_string_check() {
  Scenario_testing_scenario = true;
  Hide_errors = true;
  run(
      "def main [\n"
      "  memory-should-contain [\n"
      "    1 <- [abc]\n"
      "  ]\n"
      "]\n"
  );
  CHECK_TRACE_CONTENTS(
      "error: F - main: location '1' can't contain non-number [abc]\n"
  );
}

void test_memory_invalid_string_check2() {
  Hide_errors = true;
  run(
      "def main [\n"
      "  1:num <- copy 3\n"
      "  2:num <- copy 97\n"  // 'a'
      "  3:num <- copy 98\n"  // 'b'
      "  4:num <- copy 99\n"  // 'c'
      "  memory-should-contain [\n"
      "    1:array:character <- 0\n"
      "  ]\n"
      "]\n"
  );
  CHECK_TRACE_CONTENTS(
      "error: main: array:character types inside 'memory-should-contain' can only be compared with text literals surrounded by [], not '0'\n"
  );
}

void test_memory_check_with_comment() {
  Scenario_testing_scenario = true;
  Hide_errors = true;
  run(
      "def main [\n"
      "  memory-should-contain [\n"
      "    1 <- 34  # comment\n"
      "  ]\n"
      "]\n"
  );
  CHECK_TRACE_DOESNT_CONTAIN("error: location 1 can't contain non-number 34  # comment");
  // but there'll be an error signalled by memory-should-contain
}

//: 'trace-should-contain' is like the '+' lines in our scenarios so far
//: Like runs of contiguous '+' lines, order is important. The trace checks
//: that the lines are present *and* in the specified sequence. (There can be
//: other lines in between.)

void test_trace_check_fails() {
  Scenario_testing_scenario = true;
  Hide_errors = true;
  run(
      "def main [\n"
         // nothing added to the trace
      "  trace-should-contain [\n"
      "    a: b\n"
      "    a: d\n"
      "  ]\n"
      "]\n"
  );
  CHECK_TRACE_CONTENTS(
      "error: F - main: missing [b] in trace with label 'a'\n"
  );
}

:(before "End Primitive Recipe Declarations")
TRACE_SHOULD_CONTAIN,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "trace-should-contain", TRACE_SHOULD_CONTAIN);
:(before "End Primitive Recipe Checks")
case TRACE_SHOULD_CONTAIN: {
  break;
}
:(before "End Primitive Recipe Implementations")
case TRACE_SHOULD_CONTAIN: {
  if (!Passed) break;
  check_trace(current_instruction().ingredients.at(0).name);
  break;
}

:(code)
// simplified version of check_trace_contents() that emits errors rather
// than just printing to stderr
void check_trace(const string& expected) {
  Trace_stream->newline();
  vector<trace_line> expected_lines = parse_trace(expected);
  if (expected_lines.empty()) return;
  int curr_expected_line = 0;
  for (vector<trace_line>::iterator p = Trace_stream->past_lines.begin();  p != Trace_stream->past_lines.end();  ++p) {
    if (expected_lines.at(curr_expected_line).label != p->label) continue;
    if (expected_lines.at(curr_expected_line).contents != trim(p->contents)) continue;
    // match
    ++curr_expected_line;
    if (curr_expected_line == SIZE(expected_lines)) return;
  }
  if (!Hide_errors) cerr << '\n';
  raise << "F - " << maybe(current_recipe_name()) << "missing [" << expected_lines.at(curr_expected_line).contents << "] "
        << "in trace with label '" << expected_lines.at(curr_expected_line).label << "'\n" << end();
  if (!Hide_errors)
    DUMP(expected_lines.at(curr_expected_line).label);
  if (!Scenario_testing_scenario) Passed = false;
}

vector<trace_line> parse_trace(const string& expected) {
  vector<string> buf = split(expected, "\n");
  vector<trace_line> result;
  const string separator = ": ";
  for (int i = 0;  i < SIZE(buf);  ++i) {
    buf.at(i) = trim(buf.at(i));
    if (buf.at(i).empty()) continue;
    int delim = buf.at(i).find(separator);
    if (delim == -1) {
      raise << maybe(current_recipe_name()) << "lines in 'trace-should-contain' should be of the form <label>: <contents>. Both parts are required.\n" << end();
      result.clear();
      return result;
    }
    result.push_back(trace_line(/*contents*/  trim(buf.at(i).substr(delim+SIZE(separator)        )),
                                /*label*/     trim(buf.at(i).substr(0,                      delim))));
  }
  return result;
}

void test_trace_check_fails_in_nonfirst_line() {
  Scenario_testing_scenario = true;
  Hide_errors = true;
  run(
      "def main [\n"
      "  run [\n"
      "    trace 1, [a], [b]\n"
      "  ]\n"
      "  trace-should-contain [\n"
      "    a: b\n"
      "    a: d\n"
      "  ]\n"
      "]\n"
  );
  CHECK_TRACE_CONTENTS(
      "error: F - main: missing [d] in trace with label 'a'\n"
  );
}

void test_trace_check_passes_silently() {
  Scenario_testing_scenario = true;
  run(
      "def main [\n"
      "  run [\n"
      "    trace 1, [a], [b]\n"
      "  ]\n"
      "  trace-should-contain [\n"
      "    a: b\n"
      "  ]\n"
      "]\n"
  );
  CHECK_TRACE_DOESNT_CONTAIN("error: missing [b] in trace with label 'a'");
  CHECK_TRACE_COUNT("error", 0);
}

//: 'trace-should-not-contain' checks each line in its argument for absence.
//: Order is *not* important, so you can't say things like "B should not exist
//: after A."

void test_trace_negative_check_fails() {
  Scenario_testing_scenario = true;
  Hide_errors = true;
  run(
      "def main [\n"
      "  run [\n"
      "    trace 1, [a], [b]\n"
      "  ]\n"
      "  trace-should-not-contain [\n"
      "    a: b\n"
      "  ]\n"
      "]\n"
  );
  CHECK_TRACE_CONTENTS(
      "error: F - main: unexpected [b] in trace with label 'a'\n"
  );
}

:(before "End Primitive Recipe Declarations")
TRACE_SHOULD_NOT_CONTAIN,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "trace-should-not-contain", TRACE_SHOULD_NOT_CONTAIN);
:(before "End Primitive Recipe Checks")
case TRACE_SHOULD_NOT_CONTAIN: {
  break;
}
:(before "End Primitive Recipe Implementations")
case TRACE_SHOULD_NOT_CONTAIN: {
  if (!Passed) break;
  check_trace_missing(current_instruction().ingredients.at(0).name);
  break;
}

:(code)
// simplified version of check_trace_contents() that emits errors rather
// than just printing to stderr
bool check_trace_missing(const string& in) {
  Trace_stream->newline();
  vector<trace_line> lines = parse_trace(in);
  for (int i = 0;  i < SIZE(lines);  ++i) {
    if (trace_count(lines.at(i).label, lines.at(i).contents) != 0) {
      raise << "F - " << maybe(current_recipe_name()) << "unexpected [" << lines.at(i).contents << "] in trace with label '" << lines.at(i).label << "'\n" << end();
      if (!Scenario_testing_scenario) Passed = false;
      return false;
    }
  }
  return true;
}

void test_trace_negative_check_passes_silently() {
  Scenario_testing_scenario = true;
  run(
      "def main [\n"
      "  trace-should-not-contain [\n"
      "    a: b\n"
      "  ]\n"
      "]\n"
  );
  CHECK_TRACE_DOESNT_CONTAIN("error: unexpected [b] in trace with label 'a'");
  CHECK_TRACE_COUNT("error", 0);
}

void test_trace_negative_check_fails_on_any_unexpected_line() {
  Scenario_testing_scenario = true;
  Hide_errors = true;
  run(
      "def main [\n"
      "  run [\n"
      "    trace 1, [a], [d]\n"
      "  ]\n"
      "  trace-should-not-contain [\n"
      "    a: b\n"
      "    a: d\n"
      "  ]\n"
      "]\n"
  );
  CHECK_TRACE_CONTENTS(
      "error: F - main: unexpected [d] in trace with label 'a'\n"
  );
}

void test_trace_count_check() {
  run(
      "def main [\n"
      "  run [\n"
      "    trace 1, [a], [foo]\n"
      "  ]\n"
      "  check-trace-count-for-label 1, [a]\n"
      "]\n"
  );
  // checks are inside scenario
}

:(before "End Primitive Recipe Declarations")
CHECK_TRACE_COUNT_FOR_LABEL,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "check-trace-count-for-label", CHECK_TRACE_COUNT_FOR_LABEL);
:(before "End Primitive Recipe Checks")
case CHECK_TRACE_COUNT_FOR_LABEL: {
  if (SIZE(inst.ingredients) != 2) {
    raise << maybe(get(Recipe, r).name) << "'check-trace-count-for-label' requires exactly two ingredients, but got '" << to_original_string(inst) << "'\n" << end();
    break;
  }
  if (!is_mu_number(inst.ingredients.at(0))) {
    raise << maybe(get(Recipe, r).name) << "first ingredient of 'check-trace-count-for-label' should be a number (count), but got '" << inst.ingredients.at(0).original_string << "'\n" << end();
    break;
  }
  if (!is_literal_text(inst.ingredients.at(1))) {
    raise << maybe(get(Recipe, r).name) << "second ingredient of 'check-trace-count-for-label' should be a literal string (label), but got '" << inst.ingredients.at(1).original_string << "'\n" << end();
    break;
  }
  break;
}
:(before "End Primitive Recipe Implementations")
case CHECK_TRACE_COUNT_FOR_LABEL: {
  if (!Passed) break;
  int expected_count = ingredients.at(0).at(0);
  string label = current_instruction().ingredients.at(1).name;
  int count = trace_count(label);
  if (count != expected_count) {
    if (!Hide_errors) cerr << '\n';
    raise << "F - " << maybe(current_recipe_name()) << "expected " << expected_count << " lines in trace with label '" << label << "' in trace\n" << end();
    if (!Hide_errors) DUMP(label);
    if (!Scenario_testing_scenario) Passed = false;
  }
  break;
}

:(before "End Primitive Recipe Declarations")
CHECK_TRACE_COUNT_FOR_LABEL_GREATER_THAN,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "check-trace-count-for-label-greater-than", CHECK_TRACE_COUNT_FOR_LABEL_GREATER_THAN);
:(before "End Primitive Recipe Checks")
case CHECK_TRACE_COUNT_FOR_LABEL_GREATER_THAN: {
  if (SIZE(inst.ingredients) != 2) {
    raise << maybe(get(Recipe, r).name) << "'check-trace-count-for-label' requires exactly two ingredients, but got '" << to_original_string(inst) << "'\n" << end();
    break;
  }
  if (!is_mu_number(inst.ingredients.at(0))) {
    raise << maybe(get(Recipe, r).name) << "first ingredient of 'check-trace-count-for-label' should be a number (count), but got '" << inst.ingredients.at(0).original_string << "'\n" << end();
    break;
  }
  if (!is_literal_text(inst.ingredients.at(1))) {
    raise << maybe(get(Recipe, r).name) << "second ingredient of 'check-trace-count-for-label' should be a literal string (label), but got '" << inst.ingredients.at(1).original_string << "'\n" << end();
    break;
  }
  break;
}
:(before "End Primitive Recipe Implementations")
case CHECK_TRACE_COUNT_FOR_LABEL_GREATER_THAN: {
  if (!Passed) break;
  int expected_count = ingredients.at(0).at(0);
  string label = current_instruction().ingredients.at(1).name;
  int count = trace_count(label);
  if (count <= expected_count) {
    if (!Hide_errors) cerr << '\n';
    raise << maybe(current_recipe_name()) << "expected more than " << expected_count << " lines in trace with label '" << label << "' in trace\n" << end();
    if (!Hide_errors) {
      cerr << "trace contents:\n";
      DUMP(label);
    }
    if (!Scenario_testing_scenario) Passed = false;
  }
  break;
}

:(before "End Primitive Recipe Declarations")
CHECK_TRACE_COUNT_FOR_LABEL_LESSER_THAN,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "check-trace-count-for-label-lesser-than", CHECK_TRACE_COUNT_FOR_LABEL_LESSER_THAN);
:(before "End Primitive Recipe Checks")
case CHECK_TRACE_COUNT_FOR_LABEL_LESSER_THAN: {
  if (SIZE(inst.ingredients) != 2) {
    raise << maybe(get(Recipe, r).name) << "'check-trace-count-for-label' requires exactly two ingredients, but got '" << to_original_string(inst) << "'\n" << end();
    break;
  }
  if (!is_mu_number(inst.ingredients.at(0))) {
    raise << maybe(get(Recipe, r).name) << "first ingredient of 'check-trace-count-for-label' should be a number (count), but got '" << inst.ingredients.at(0).original_string << "'\n" << end();
    break;
  }
  if (!is_literal_text(inst.ingredients.at(1))) {
    raise << maybe(get(Recipe, r).name) << "second ingredient of 'check-trace-count-for-label' should be a literal string (label), but got '" << inst.ingredients.at(1).original_string << "'\n" << end();
    break;
  }
  break;
}
:(before "End Primitive Recipe Implementations")
case CHECK_TRACE_COUNT_FOR_LABEL_LESSER_THAN: {
  if (!Passed) break;
  int expected_count = ingredients.at(0).at(0);
  string label = current_instruction().ingredients.at(1).name;
  int count = trace_count(label);
  if (count >= expected_count) {
    if (!Hide_errors) cerr << '\n';
    raise << "F - " << maybe(current_recipe_name()) << "expected less than " << expected_count << " lines in trace with label '" << label << "' in trace\n" << end();
    if (!Hide_errors) {
      cerr << "trace contents:\n";
      DUMP(label);
    }
    if (!Scenario_testing_scenario) Passed = false;
  }
  break;
}

:(code)
void test_trace_count_check_2() {
  Scenario_testing_scenario = true;
  Hide_errors = true;
  run(
      "def main [\n"
      "  run [\n"
      "    trace 1, [a], [foo]\n"
      "  ]\n"
      "  check-trace-count-for-label 2, [a]\n"
      "]\n"
  );
  CHECK_TRACE_CONTENTS(
      "error: F - main: expected 2 lines in trace with label 'a' in trace\n"
  );
}

//: Minor detail: ignore 'system' calls in scenarios, since anything we do
//: with them is by definition impossible to test through Mu.
:(after "case _SYSTEM:")
  if (Current_scenario) break;

//:: Warn if people use '_' manually in recipe names. They're reserved for internal use.

:(code)
void test_recipe_name_with_underscore() {
  Hide_errors = true;
  run(
      "def foo_bar [\n"
      "]\n"
  );
  CHECK_TRACE_CONTENTS(
      "error: foo_bar: don't create recipes with '_' in the name\n"
  );
}

:(before "End recipe Fields")
bool is_autogenerated;
:(before "End recipe Constructor")
is_autogenerated = false;
:(code)
void mark_autogenerated(recipe_ordinal r) {
  get(Recipe, r).is_autogenerated = true;
}

:(after "void transform_all()")
  for (map<recipe_ordinal, recipe>::iterator p = Recipe.begin();  p != Recipe.end();  ++p) {
    const recipe& r = p->second;
    if (r.name.find('_') == string::npos) continue;
    if (r.is_autogenerated) continue;  // created by previous call to transform_all()
    raise << r.name << ": don't create recipes with '_' in the name\n" << end();
  }

//:: Helpers

:(code)
// just for the scenarios running scenarios in C++ layers
void run_mu_scenario(const string& form) {
  Scenario_names.clear();
  istringstream in(form);
  in >> std::noskipws;
  skip_whitespace_and_comments(in);
  string _scenario = next_word(in);
  if (_scenario.empty()) {
    assert(!has_data(in));
    raise << "no scenario in string passed into run_mu_scenario()\n" << end();
    return;
  }
  assert(_scenario == "scenario");
  scenario s = parse_scenario(in);
  run_mu_scenario(s);
}