ruchy 4.2.1

A systems scripting language that transpiles to idiomatic Rust with extreme quality engineering
Documentation
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
    use super::*;

    // =========================================================================
    // FLOAT METHOD TESTS
    // =========================================================================

    #[test]
    fn test_float_sqrt() {
        assert_eq!(
            eval_float_method(9.0, "sqrt", true).expect("eval_float_method should succeed in test"),
            Value::Float(3.0)
        );
        assert_eq!(
            eval_float_method(0.0, "sqrt", true).expect("eval_float_method should succeed in test"),
            Value::Float(0.0)
        );
    }

    #[test]
    fn test_float_abs() {
        assert_eq!(
            eval_float_method(-5.5, "abs", true).expect("eval_float_method should succeed in test"),
            Value::Float(5.5)
        );
        assert_eq!(
            eval_float_method(5.5, "abs", true).expect("eval_float_method should succeed in test"),
            Value::Float(5.5)
        );
    }

    #[test]
    fn test_float_round() {
        assert_eq!(
            eval_float_method(3.7, "round", true)
                .expect("eval_float_method should succeed in test"),
            Value::Float(4.0)
        );
        assert_eq!(
            eval_float_method(3.2, "round", true)
                .expect("eval_float_method should succeed in test"),
            Value::Float(3.0)
        );
    }

    #[test]
    fn test_float_floor() {
        assert_eq!(
            eval_float_method(3.7, "floor", true)
                .expect("eval_float_method should succeed in test"),
            Value::Float(3.0)
        );
        assert_eq!(
            eval_float_method(-3.7, "floor", true)
                .expect("eval_float_method should succeed in test"),
            Value::Float(-4.0)
        );
    }

    #[test]
    fn test_float_ceil() {
        assert_eq!(
            eval_float_method(3.2, "ceil", true).expect("eval_float_method should succeed in test"),
            Value::Float(4.0)
        );
        assert_eq!(
            eval_float_method(-3.2, "ceil", true)
                .expect("eval_float_method should succeed in test"),
            Value::Float(-3.0)
        );
    }

    #[test]
    fn test_float_trig() {
        // sin, cos, tan
        assert!(
            (eval_float_method(0.0, "sin", true)
                .expect("eval_float_method should succeed in test")
                == Value::Float(0.0))
        );
        assert!(
            (eval_float_method(0.0, "cos", true)
                .expect("eval_float_method should succeed in test")
                == Value::Float(1.0))
        );
        assert!(
            (eval_float_method(0.0, "tan", true)
                .expect("eval_float_method should succeed in test")
                == Value::Float(0.0))
        );
    }

    #[test]
    fn test_float_log() {
        assert_eq!(
            eval_float_method(std::f64::consts::E, "ln", true)
                .expect("eval_float_method should succeed in test"),
            Value::Float(1.0)
        );
        assert_eq!(
            eval_float_method(10.0, "log10", true)
                .expect("eval_float_method should succeed in test"),
            Value::Float(1.0)
        );
        assert_eq!(
            eval_float_method(0.0, "exp", true).expect("eval_float_method should succeed in test"),
            Value::Float(1.0)
        );
    }

    #[test]
    fn test_float_to_string() {
        let result = eval_float_method(std::f64::consts::PI, "to_string", true)
            .expect("eval_float_method should succeed in test");
        match result {
            Value::String(s) => assert_eq!(s.as_ref(), &std::f64::consts::PI.to_string()),
            _ => panic!("Expected String"),
        }
    }

    #[test]
    fn test_float_powf_error() {
        let result = eval_float_method(2.0, "powf", true);
        assert!(result.is_err());
        assert!(result.unwrap_err().to_string().contains("Use ** operator"));
    }

    #[test]
    fn test_float_with_args_error() {
        let result = eval_float_method(5.0, "sqrt", false);
        assert!(result.is_err());
        assert!(result
            .unwrap_err()
            .to_string()
            .contains("takes no arguments"));
    }

    #[test]
    fn test_float_unknown_method() {
        let result = eval_float_method(5.0, "unknown", true);
        assert!(result.is_err());
        assert!(result
            .unwrap_err()
            .to_string()
            .contains("Unknown float method"));
    }

    // =========================================================================
    // INTEGER METHOD TESTS
    // =========================================================================

    #[test]
    fn test_integer_abs() {
        assert_eq!(
            eval_integer_method(-42, "abs", &[])
                .expect("eval_integer_method should succeed in test"),
            Value::Integer(42)
        );
        assert_eq!(
            eval_integer_method(42, "abs", &[])
                .expect("eval_integer_method should succeed in test"),
            Value::Integer(42)
        );
        assert_eq!(
            eval_integer_method(0, "abs", &[]).expect("eval_integer_method should succeed in test"),
            Value::Integer(0)
        );
    }

    #[test]
    fn test_integer_sqrt() {
        assert_eq!(
            eval_integer_method(16, "sqrt", &[])
                .expect("eval_integer_method should succeed in test"),
            Value::Float(4.0)
        );
        assert_eq!(
            eval_integer_method(0, "sqrt", &[])
                .expect("eval_integer_method should succeed in test"),
            Value::Float(0.0)
        );
    }

    #[test]
    fn test_integer_to_float() {
        assert_eq!(
            eval_integer_method(42, "to_float", &[])
                .expect("eval_integer_method should succeed in test"),
            Value::Float(42.0)
        );
        assert_eq!(
            eval_integer_method(-5, "to_float", &[])
                .expect("eval_integer_method should succeed in test"),
            Value::Float(-5.0)
        );
    }

    #[test]
    fn test_integer_to_string() {
        let result = eval_integer_method(123, "to_string", &[])
            .expect("eval_integer_method should succeed in test");
        assert_eq!(result, Value::from_string("123".to_string()));
    }

    #[test]
    fn test_integer_signum() {
        assert_eq!(
            eval_integer_method(42, "signum", &[])
                .expect("eval_integer_method should succeed in test"),
            Value::Integer(1)
        );
        assert_eq!(
            eval_integer_method(-42, "signum", &[])
                .expect("eval_integer_method should succeed in test"),
            Value::Integer(-1)
        );
        assert_eq!(
            eval_integer_method(0, "signum", &[])
                .expect("eval_integer_method should succeed in test"),
            Value::Integer(0)
        );
    }

    #[test]
    fn test_integer_pow() {
        let result = eval_integer_method(2, "pow", &[Value::Integer(3)])
            .expect("eval_integer_method should succeed in test");
        assert_eq!(result, Value::Integer(8));

        let result = eval_integer_method(5, "pow", &[Value::Integer(0)])
            .expect("eval_integer_method should succeed in test");
        assert_eq!(result, Value::Integer(1));
    }

    #[test]
    fn test_integer_pow_negative_exponent_error() {
        let result = eval_integer_method(2, "pow", &[Value::Integer(-1)]);
        assert!(result.is_err());
        assert!(result.unwrap_err().to_string().contains("non-negative"));
    }

    #[test]
    fn test_integer_pow_wrong_type_error() {
        let result = eval_integer_method(2, "pow", &[Value::Float(3.0)]);
        assert!(result.is_err());
        assert!(result.unwrap_err().to_string().contains("integer exponent"));
    }

    #[test]
    fn test_integer_pow_wrong_arg_count() {
        let result = eval_integer_method(2, "pow", &[]);
        assert!(result.is_err());
        assert!(result
            .unwrap_err()
            .to_string()
            .contains("requires exactly 1 argument"));
    }

    #[test]
    fn test_integer_abs_with_args_error() {
        let result = eval_integer_method(42, "abs", &[Value::Integer(1)]);
        assert!(result.is_err());
        assert!(result
            .unwrap_err()
            .to_string()
            .contains("takes no arguments"));
    }

    #[test]
    fn test_integer_unknown_method() {
        let result = eval_integer_method(42, "unknown", &[]);
        assert!(result.is_err());
        assert!(result
            .unwrap_err()
            .to_string()
            .contains("Unknown integer method"));
    }

    // =========================================================================
    // DATAFRAME METHOD TESTS
    // =========================================================================

    #[test]
    fn test_dataframe_count() {
        let columns = vec![DataFrameColumn {
            name: "a".to_string(),
            values: vec![Value::Integer(1), Value::Integer(2), Value::Integer(3)],
        }];
        assert_eq!(
            eval_dataframe_count(&columns, &[])
                .expect("eval_dataframe_count should succeed in test"),
            Value::Integer(3)
        );
    }

    #[test]
    fn test_dataframe_sum() {
        let columns = vec![DataFrameColumn {
            name: "a".to_string(),
            values: vec![Value::Integer(1), Value::Integer(2), Value::Integer(3)],
        }];
        assert_eq!(
            eval_dataframe_sum(&columns, &[]).expect("eval_dataframe_sum should succeed in test"),
            Value::Float(6.0)
        );
    }

    #[test]
    fn test_dataframe_sum_mixed_types() {
        let columns = vec![DataFrameColumn {
            name: "a".to_string(),
            values: vec![Value::Integer(1), Value::Float(2.5), Value::Integer(3)],
        }];
        assert_eq!(
            eval_dataframe_sum(&columns, &[]).expect("eval_dataframe_sum should succeed in test"),
            Value::Float(6.5)
        );
    }

    #[test]
    fn test_dataframe_mean() {
        let columns = vec![DataFrameColumn {
            name: "a".to_string(),
            values: vec![Value::Integer(1), Value::Integer(2), Value::Integer(3)],
        }];
        assert_eq!(
            eval_dataframe_mean(&columns, &[]).expect("eval_dataframe_mean should succeed in test"),
            Value::Float(2.0)
        );
    }

    #[test]
    fn test_dataframe_max() {
        let columns = vec![DataFrameColumn {
            name: "a".to_string(),
            values: vec![Value::Integer(1), Value::Integer(5), Value::Integer(3)],
        }];
        assert_eq!(
            eval_dataframe_max(&columns, &[]).expect("eval_dataframe_max should succeed in test"),
            Value::Float(5.0)
        );
    }

    #[test]
    fn test_dataframe_min() {
        let columns = vec![DataFrameColumn {
            name: "a".to_string(),
            values: vec![Value::Integer(5), Value::Integer(1), Value::Integer(3)],
        }];
        assert_eq!(
            eval_dataframe_min(&columns, &[]).expect("eval_dataframe_min should succeed in test"),
            Value::Float(1.0)
        );
    }

    #[test]
    fn test_dataframe_columns() {
        let columns = vec![
            DataFrameColumn {
                name: "a".to_string(),
                values: vec![Value::Integer(1)],
            },
            DataFrameColumn {
                name: "b".to_string(),
                values: vec![Value::Integer(2)],
            },
        ];
        let result = eval_dataframe_columns(&columns, &[])
            .expect("eval_dataframe_columns should succeed in test");
        match result {
            Value::Array(arr) => {
                assert_eq!(arr.len(), 2);
                assert_eq!(arr[0], Value::from_string("a".to_string()));
                assert_eq!(arr[1], Value::from_string("b".to_string()));
            }
            _ => panic!("Expected Array"),
        }
    }

    #[test]
    fn test_dataframe_shape() {
        let columns = vec![
            DataFrameColumn {
                name: "a".to_string(),
                values: vec![Value::Integer(1), Value::Integer(2), Value::Integer(3)],
            },
            DataFrameColumn {
                name: "b".to_string(),
                values: vec![Value::Integer(4), Value::Integer(5), Value::Integer(6)],
            },
        ];
        let result = eval_dataframe_shape(&columns, &[])
            .expect("eval_dataframe_shape should succeed in test");
        match result {
            Value::Array(arr) => {
                assert_eq!(arr[0], Value::Integer(3)); // rows
                assert_eq!(arr[1], Value::Integer(2)); // columns
            }
            _ => panic!("Expected Array"),
        }
    }

    // =========================================================================
    // GENERIC METHOD TESTS
    // =========================================================================

    #[test]
    fn test_generic_to_string_bool() {
        let value = Value::Bool(true);
        assert_eq!(
            eval_generic_method(&value, "to_string", true)
                .expect("eval_generic_method should succeed in test"),
            Value::from_string("true".to_string())
        );
    }

    #[test]
    fn test_generic_to_string_nil() {
        let value = Value::Nil;
        let result = eval_generic_method(&value, "to_string", true)
            .expect("eval_generic_method should succeed in test");
        assert_eq!(result, Value::from_string("nil".to_string()));
    }

    #[test]
    fn test_generic_unknown_method() {
        let value = Value::Bool(true);
        let result = eval_generic_method(&value, "unknown", true);
        assert!(result.is_err());
        assert!(result.unwrap_err().to_string().contains("not found"));
    }

    // =========================================================================
    // DISPATCH TESTS (dispatch_method_call)
    // =========================================================================

    #[test]
    fn test_dispatch_turbofish_stripping() {
        // Test that turbofish syntax is stripped from method names
        // Example: "parse::<i32>" becomes "parse"
        let s = Arc::from("42");
        let value = Value::String(s);

        // Mock closures
        let mut eval_fn = |_v: &Value, _args: &[Value]| Ok(Value::Integer(0));
        let eval_df = |_v: &Value, _args: &[Expr]| Ok(Value::Integer(0));
        let eval_ctx = |_e: &Expr, _cols: &[DataFrameColumn], _row: usize| Ok(Value::Integer(0));

        // This should work because turbofish is stripped
        let result = dispatch_method_call(
            &value,
            "to_string::<String>", // With turbofish
            &[],
            true,
            &mut eval_fn,
            eval_df,
            eval_ctx,
        );
        assert!(result.is_ok());
    }

    // Round 95: Additional method dispatch tests

    // Test 35: dataframe empty columns
    #[test]
    fn test_dataframe_columns_empty() {
        let columns: Vec<DataFrameColumn> = vec![];
        let result = eval_dataframe_columns(&columns, &[])
            .expect("eval_dataframe_columns should succeed for empty");
        match result {
            Value::Array(arr) => assert!(arr.is_empty()),
            _ => panic!("Expected empty Array"),
        }
    }

    // Test 36: dataframe shape empty
    #[test]
    fn test_dataframe_shape_empty() {
        let columns: Vec<DataFrameColumn> = vec![];
        let result = eval_dataframe_shape(&columns, &[])
            .expect("eval_dataframe_shape should succeed for empty");
        match result {
            Value::Array(arr) => {
                assert_eq!(arr[0], Value::Integer(0));
                assert_eq!(arr[1], Value::Integer(0));
            }
            _ => panic!("Expected Array"),
        }
    }

    // Test 37: dataframe sum empty
    #[test]
    fn test_dataframe_sum_empty() {
        let columns: Vec<DataFrameColumn> = vec![];
        let result = eval_dataframe_sum(&columns, &[]);
        // Empty columns might return 0 or error
        assert!(result.is_ok() || result.is_err());
    }

    // Test 38: dataframe mean with single value
    #[test]
    fn test_dataframe_mean_single() {
        let columns = vec![DataFrameColumn {
            name: "a".to_string(),
            values: vec![Value::Integer(42)],
        }];
        let result =
            eval_dataframe_mean(&columns, &[]).expect("eval_dataframe_mean should succeed");
        assert_eq!(result, Value::Float(42.0));
    }

    // Test 39: generic to_string integer
    #[test]
    fn test_generic_to_string_integer() {
        let value = Value::Integer(42);
        let result = eval_generic_method(&value, "to_string", true)
            .expect("eval_generic_method should succeed");
        assert_eq!(result, Value::from_string("42".to_string()));
    }

    // Test 40: generic to_string float
    #[test]
    fn test_generic_to_string_float() {
        let value = Value::Float(3.14);
        let result = eval_generic_method(&value, "to_string", true)
            .expect("eval_generic_method should succeed");
        // Float to_string might include precision
        match result {
            Value::String(s) => assert!(s.starts_with("3.14")),
            _ => panic!("Expected String"),
        }
    }

    // Test 41: generic to_string array
    #[test]
    fn test_generic_to_string_array() {
        let value = Value::Array(Arc::from(vec![Value::Integer(1), Value::Integer(2)]));
        let result = eval_generic_method(&value, "to_string", true)
            .expect("eval_generic_method should succeed");
        match result {
            Value::String(_) => {} // Any string representation is fine
            _ => panic!("Expected String"),
        }
    }

    // Test 42: dataframe single column max
    #[test]
    fn test_dataframe_max_single() {
        let columns = vec![DataFrameColumn {
            name: "a".to_string(),
            values: vec![Value::Integer(42)],
        }];
        assert_eq!(
            eval_dataframe_max(&columns, &[]).expect("eval_dataframe_max should succeed"),
            Value::Float(42.0)
        );
    }

    // Test 43: dataframe single column min
    #[test]
    fn test_dataframe_min_single() {
        let columns = vec![DataFrameColumn {
            name: "a".to_string(),
            values: vec![Value::Integer(42)],
        }];
        assert_eq!(
            eval_dataframe_min(&columns, &[]).expect("eval_dataframe_min should succeed"),
            Value::Float(42.0)
        );
    }

    // Test 44: dataframe with float values
    #[test]
    fn test_dataframe_sum_floats() {
        let columns = vec![DataFrameColumn {
            name: "values".to_string(),
            values: vec![Value::Float(1.5), Value::Float(2.5), Value::Float(3.0)],
        }];
        let result = eval_dataframe_sum(&columns, &[])
            .expect("eval_dataframe_sum should succeed for floats");
        match result {
            Value::Float(f) => assert!((f - 7.0).abs() < 0.001),
            _ => panic!("Expected Float"),
        }
    }

    // Test 45: dataframe shape with multiple columns
    #[test]
    fn test_dataframe_shape_multi_column() {
        let columns = vec![
            DataFrameColumn {
                name: "a".to_string(),
                values: vec![Value::Integer(1)],
            },
            DataFrameColumn {
                name: "b".to_string(),
                values: vec![Value::Integer(2)],
            },
            DataFrameColumn {
                name: "c".to_string(),
                values: vec![Value::Integer(3)],
            },
        ];
        let result =
            eval_dataframe_shape(&columns, &[]).expect("eval_dataframe_shape should succeed");
        match result {
            Value::Array(arr) => {
                assert_eq!(arr[0], Value::Integer(1)); // 1 row
                assert_eq!(arr[1], Value::Integer(3)); // 3 columns
            }
            _ => panic!("Expected Array"),
        }
    }

    // Test 46: dispatch with array value
    #[test]
    fn test_dispatch_array_method() {
        let value = Value::Array(Arc::from(vec![Value::Integer(1), Value::Integer(2)]));

        let mut eval_fn = |_v: &Value, _args: &[Value]| Ok(Value::Integer(2));
        let eval_df = |_v: &Value, _args: &[Expr]| Ok(Value::Integer(0));
        let eval_ctx = |_e: &Expr, _cols: &[DataFrameColumn], _row: usize| Ok(Value::Integer(0));

        let result =
            dispatch_method_call(&value, "len", &[], true, &mut eval_fn, eval_df, eval_ctx);
        assert!(result.is_ok());
    }

    // Test 47: dispatch with nil value
    #[test]
    fn test_dispatch_nil_to_string() {
        let value = Value::Nil;

        let mut eval_fn = |_v: &Value, _args: &[Value]| Ok(Value::from_string("nil".to_string()));
        let eval_df = |_v: &Value, _args: &[Expr]| Ok(Value::Integer(0));
        let eval_ctx = |_e: &Expr, _cols: &[DataFrameColumn], _row: usize| Ok(Value::Integer(0));

        let result = dispatch_method_call(
            &value,
            "to_string",
            &[],
            true,
            &mut eval_fn,
            eval_df,
            eval_ctx,
        );
        assert!(result.is_ok());
    }

    // =========================================================================
    // EXTREME TDD ROUND 127 - Additional Coverage Tests
    // =========================================================================

    // Test R127-01: eval_dataframe_select success
    #[test]
    fn test_dataframe_select_success_r127() {
        let columns = vec![
            DataFrameColumn {
                name: "price".to_string(),
                values: vec![Value::Float(10.5), Value::Float(20.0)],
            },
            DataFrameColumn {
                name: "quantity".to_string(),
                values: vec![Value::Integer(5), Value::Integer(10)],
            },
        ];
        let result = eval_dataframe_select(&columns, &[Value::from_string("price".to_string())])
            .expect("should select column");
        match result {
            Value::DataFrame { columns: selected } => {
                assert_eq!(selected.len(), 1);
                assert_eq!(selected[0].name, "price");
            }
            _ => panic!("Expected DataFrame"),
        }
    }

    // Test R127-02: eval_dataframe_select column not found
    #[test]
    fn test_dataframe_select_not_found_r127() {
        let columns = vec![DataFrameColumn {
            name: "a".to_string(),
            values: vec![Value::Integer(1)],
        }];
        let result = eval_dataframe_select(&columns, &[Value::from_string("missing".to_string())]);
        assert!(result.is_err());
        assert!(result.unwrap_err().to_string().contains("not found"));
    }

    // Test R127-03: eval_dataframe_select wrong arg type
    #[test]
    fn test_dataframe_select_wrong_type_r127() {
        let columns = vec![DataFrameColumn {
            name: "a".to_string(),
            values: vec![Value::Integer(1)],
        }];
        let result = eval_dataframe_select(&columns, &[Value::Integer(42)]);
        assert!(result.is_err());
        assert!(result.unwrap_err().to_string().contains("column name"));
    }

    // Test R127-04: eval_dataframe_select wrong arg count
    #[test]
    fn test_dataframe_select_wrong_count_r127() {
        let columns = vec![DataFrameColumn {
            name: "a".to_string(),
            values: vec![Value::Integer(1)],
        }];
        let result = eval_dataframe_select(&columns, &[]);
        assert!(result.is_err());
        assert!(result.unwrap_err().to_string().contains("exactly 1"));
    }

    // Test R127-05: dataframe count with args error
    #[test]
    fn test_dataframe_count_with_args_error_r127() {
        let columns = vec![DataFrameColumn {
            name: "a".to_string(),
            values: vec![Value::Integer(1)],
        }];
        let result = eval_dataframe_count(&columns, &[Value::Integer(1)]);
        assert!(result.is_err());
        assert!(result.unwrap_err().to_string().contains("no arguments"));
    }

    // Test R127-06: dataframe sum with args error
    #[test]
    fn test_dataframe_sum_with_args_error_r127() {
        let columns = vec![DataFrameColumn {
            name: "a".to_string(),
            values: vec![Value::Integer(1)],
        }];
        let result = eval_dataframe_sum(&columns, &[Value::Integer(1)]);
        assert!(result.is_err());
        assert!(result.unwrap_err().to_string().contains("no arguments"));
    }

    // Test R127-07: dataframe mean with args error
    #[test]
    fn test_dataframe_mean_with_args_error_r127() {
        let columns = vec![DataFrameColumn {
            name: "a".to_string(),
            values: vec![Value::Integer(1)],
        }];
        let result = eval_dataframe_mean(&columns, &[Value::Integer(1)]);
        assert!(result.is_err());
        assert!(result.unwrap_err().to_string().contains("no arguments"));
    }

    // Test R127-08: dataframe max with args error
    #[test]
    fn test_dataframe_max_with_args_error_r127() {
        let columns = vec![DataFrameColumn {
            name: "a".to_string(),
            values: vec![Value::Integer(1)],
        }];
        let result = eval_dataframe_max(&columns, &[Value::Integer(1)]);
        assert!(result.is_err());
        assert!(result.unwrap_err().to_string().contains("no arguments"));
    }

    // Test R127-09: dataframe min with args error
    #[test]
    fn test_dataframe_min_with_args_error_r127() {
        let columns = vec![DataFrameColumn {
            name: "a".to_string(),
            values: vec![Value::Integer(1)],
        }];
        let result = eval_dataframe_min(&columns, &[Value::Integer(1)]);
        assert!(result.is_err());
        assert!(result.unwrap_err().to_string().contains("no arguments"));
    }

    // Test R127-10: dataframe columns with args error
    #[test]
    fn test_dataframe_columns_with_args_error_r127() {
        let columns = vec![DataFrameColumn {
            name: "a".to_string(),
            values: vec![Value::Integer(1)],
        }];
        let result = eval_dataframe_columns(&columns, &[Value::Integer(1)]);
        assert!(result.is_err());
        assert!(result.unwrap_err().to_string().contains("no arguments"));
    }

    // Test R127-11: dataframe shape with args error
    #[test]
    fn test_dataframe_shape_with_args_error_r127() {
        let columns = vec![DataFrameColumn {
            name: "a".to_string(),
            values: vec![Value::Integer(1)],
        }];
        let result = eval_dataframe_shape(&columns, &[Value::Integer(1)]);
        assert!(result.is_err());
        assert!(result.unwrap_err().to_string().contains("no arguments"));
    }

    // Test R127-12: dataframe mean empty (nil result)
    #[test]
    fn test_dataframe_mean_empty_nil_r127() {
        let columns: Vec<DataFrameColumn> = vec![];
        let result = eval_dataframe_mean(&columns, &[]).expect("should return nil for empty");
        assert_eq!(result, Value::Nil);
    }

    // Test R127-13: dataframe max empty (nil result)
    #[test]
    fn test_dataframe_max_empty_nil_r127() {
        let columns: Vec<DataFrameColumn> = vec![];
        let result = eval_dataframe_max(&columns, &[]).expect("should return nil for empty");
        assert_eq!(result, Value::Nil);
    }

    // Test R127-14: dataframe min empty (nil result)
    #[test]
    fn test_dataframe_min_empty_nil_r127() {
        let columns: Vec<DataFrameColumn> = vec![];
        let result = eval_dataframe_min(&columns, &[]).expect("should return nil for empty");
        assert_eq!(result, Value::Nil);
    }

    // Test R127-15: dataframe unknown method
    #[test]
    fn test_dataframe_unknown_method_r127() {
        let columns = vec![DataFrameColumn {
            name: "a".to_string(),
            values: vec![Value::Integer(1)],
        }];
        let result = eval_dataframe_method(&columns, "unknown_method", &[]);
        assert!(result.is_err());
        assert!(result
            .unwrap_err()
            .to_string()
            .contains("Unknown DataFrame"));
    }

    // Test R127-16: dataframe count empty
    #[test]
    fn test_dataframe_count_empty_r127() {
        let columns: Vec<DataFrameColumn> = vec![];
        let result = eval_dataframe_count(&columns, &[]).expect("should return 0 for empty");
        assert_eq!(result, Value::Integer(0));
    }

    // Test R127-17: eval_exit_status_method success
    #[test]
    fn test_exit_status_method_success_r127() {
        let mut obj = std::collections::HashMap::new();
        obj.insert(
            "__type".to_string(),
            Value::from_string("ExitStatus".to_string()),
        );
        obj.insert("success".to_string(), Value::Bool(true));
        obj.insert("code".to_string(), Value::Integer(0));

        let result = eval_exit_status_method(&obj, "success", &[]).expect("should get success");
        assert_eq!(result, Value::Bool(true));
    }

    // Test R127-18: eval_exit_status_method success false
    #[test]
    fn test_exit_status_method_success_false_r127() {
        let mut obj = std::collections::HashMap::new();
        obj.insert(
            "__type".to_string(),
            Value::from_string("ExitStatus".to_string()),
        );
        obj.insert("success".to_string(), Value::Bool(false));
        obj.insert("code".to_string(), Value::Integer(1));

        let result = eval_exit_status_method(&obj, "success", &[]).expect("should get success");
        assert_eq!(result, Value::Bool(false));
    }

    // Test R127-19: eval_exit_status_method with args error
    #[test]
    fn test_exit_status_method_with_args_r127() {
        let mut obj = std::collections::HashMap::new();
        obj.insert(
            "__type".to_string(),
            Value::from_string("ExitStatus".to_string()),
        );
        obj.insert("success".to_string(), Value::Bool(true));

        let result = eval_exit_status_method(&obj, "success", &[Value::Integer(1)]);
        assert!(result.is_err());
        assert!(result.unwrap_err().to_string().contains("no arguments"));
    }

    // Test R127-20: eval_exit_status_method unknown method
    #[test]
    fn test_exit_status_method_unknown_r127() {
        let mut obj = std::collections::HashMap::new();
        obj.insert(
            "__type".to_string(),
            Value::from_string("ExitStatus".to_string()),
        );
        obj.insert("success".to_string(), Value::Bool(true));

        let result = eval_exit_status_method(&obj, "unknown", &[]);
        assert!(result.is_err());
        assert!(result
            .unwrap_err()
            .to_string()
            .contains("Unknown ExitStatus"));
    }

    // Test R127-21: eval_exit_status_method missing success field
    #[test]
    fn test_exit_status_method_missing_field_r127() {
        let mut obj = std::collections::HashMap::new();
        obj.insert(
            "__type".to_string(),
            Value::from_string("ExitStatus".to_string()),
        );
        // Missing "success" field

        let result = eval_exit_status_method(&obj, "success", &[]);
        assert!(result.is_err());
        assert!(result.unwrap_err().to_string().contains("missing"));
    }

    // Test R127-22: require_no_args helper with args
    #[test]
    fn test_require_no_args_with_args_r127() {
        let result = require_no_args("test_method", &[Value::Integer(1)]);
        assert!(result.is_err());
        assert!(result.unwrap_err().to_string().contains("no arguments"));
    }

    // Test R127-23: require_no_args helper empty
    #[test]
    fn test_require_no_args_empty_r127() {
        let result = require_no_args("test_method", &[]);
        assert!(result.is_ok());
    }

    // Test R127-24: eval_integer_pow multiple args
    #[test]
    fn test_integer_pow_multiple_args_r127() {
        let result = eval_integer_pow(2, &[Value::Integer(3), Value::Integer(4)]);
        assert!(result.is_err());
        assert!(result.unwrap_err().to_string().contains("exactly 1"));
    }

    // Test R127-25: try_dispatch_builtin no marker
    #[test]
    fn test_try_dispatch_builtin_no_marker_r127() {
        let obj = std::collections::HashMap::new();
        let result = try_dispatch_builtin(&obj, "some_method", &[]).expect("should return None");
        assert!(result.is_none());
    }

    // Test R127-26: try_dispatch_builtin not builtin
    #[test]
    fn test_try_dispatch_builtin_not_builtin_r127() {
        let mut obj = std::collections::HashMap::new();
        obj.insert(
            "some_method".to_string(),
            Value::from_string("regular_value".to_string()),
        );
        let result = try_dispatch_builtin(&obj, "some_method", &[])
            .expect("should return None for non-builtin");
        assert!(result.is_none());
    }

    // Test R127-27: eval_object_method missing type marker
    #[test]
    fn test_object_method_missing_type_r127() {
        let obj = std::collections::HashMap::new();
        let result = eval_object_method(&obj, "test", &[]);
        assert!(result.is_err());
        assert!(result.unwrap_err().to_string().contains("missing __type"));
    }

    // Test R127-28: eval_object_method unknown type
    #[test]
    fn test_object_method_unknown_type_r127() {
        let mut obj = std::collections::HashMap::new();
        obj.insert(
            "__type".to_string(),
            Value::from_string("UnknownType".to_string()),
        );
        let result = eval_object_method(&obj, "test", &[]);
        assert!(result.is_err());
        assert!(result
            .unwrap_err()
            .to_string()
            .contains("Unknown object type"));
    }

    // Test R127-29: generic method with args (should fail)
    #[test]
    fn test_generic_to_string_with_args_r127() {
        let value = Value::Bool(true);
        let result = eval_generic_method(&value, "to_string", false);
        assert!(result.is_err());
        assert!(result.unwrap_err().to_string().contains("not found"));
    }

    // Test R127-30: dispatch with dataframe value
    #[test]
    fn test_dispatch_dataframe_method_r127() {
        let columns = vec![DataFrameColumn {
            name: "a".to_string(),
            values: vec![Value::Integer(1)],
        }];
        let value = Value::DataFrame { columns };

        let mut eval_fn = |_v: &Value, _args: &[Value]| Ok(Value::Integer(0));
        let eval_df = |_v: &Value, _args: &[Expr]| Ok(Value::Integer(0));
        let eval_ctx = |_e: &Expr, _cols: &[DataFrameColumn], _row: usize| Ok(Value::Integer(0));

        let result =
            dispatch_method_call(&value, "count", &[], true, &mut eval_fn, eval_df, eval_ctx);
        assert!(result.is_ok());
        assert_eq!(result.expect("should work"), Value::Integer(1));
    }

    // Test R127-31: dispatch with float value
    #[test]
    fn test_dispatch_float_method_r127() {
        let value = Value::Float(9.0);

        let mut eval_fn = |_v: &Value, _args: &[Value]| Ok(Value::Integer(0));
        let eval_df = |_v: &Value, _args: &[Expr]| Ok(Value::Integer(0));
        let eval_ctx = |_e: &Expr, _cols: &[DataFrameColumn], _row: usize| Ok(Value::Integer(0));

        let result =
            dispatch_method_call(&value, "sqrt", &[], true, &mut eval_fn, eval_df, eval_ctx);
        assert!(result.is_ok());
        assert_eq!(result.expect("should work"), Value::Float(3.0));
    }

    // Test R127-32: dispatch with integer value
    #[test]
    fn test_dispatch_integer_method_r127() {
        let value = Value::Integer(-42);

        let mut eval_fn = |_v: &Value, _args: &[Value]| Ok(Value::Integer(0));
        let eval_df = |_v: &Value, _args: &[Expr]| Ok(Value::Integer(0));
        let eval_ctx = |_e: &Expr, _cols: &[DataFrameColumn], _row: usize| Ok(Value::Integer(0));

        let result =
            dispatch_method_call(&value, "abs", &[], true, &mut eval_fn, eval_df, eval_ctx);
        assert!(result.is_ok());
        assert_eq!(result.expect("should work"), Value::Integer(42));
    }

    // Test R127-33: dispatch with object value (Command type)
    #[cfg(not(target_arch = "wasm32"))]
    #[test]
    fn test_dispatch_object_command_r127() {
        let mut obj = std::collections::HashMap::new();
        obj.insert(
            "__type".to_string(),
            Value::from_string("Command".to_string()),
        );
        obj.insert(
            "program".to_string(),
            Value::from_string("echo".to_string()),
        );
        obj.insert("args".to_string(), Value::Array(Arc::from(vec![])));
        let value = Value::Object(Arc::new(obj));

        let mut eval_fn = |_v: &Value, _args: &[Value]| Ok(Value::Integer(0));
        let eval_df = |_v: &Value, _args: &[Expr]| Ok(Value::Integer(0));
        let eval_ctx = |_e: &Expr, _cols: &[DataFrameColumn], _row: usize| Ok(Value::Integer(0));

        let result = dispatch_method_call(
            &value,
            "arg",
            &[Value::from_string("hello".to_string())],
            false,
            &mut eval_fn,
            eval_df,
            eval_ctx,
        );
        assert!(result.is_ok());
    }

    // Test R127-34: eval_method_call wrapper function
    #[test]
    fn test_eval_method_call_wrapper_r127() {
        let value = Value::Float(16.0);

        let result = eval_method_call(
            &value,
            "sqrt",
            &[],
            true,
            |_v: &Value, _args: &[Value]| Ok(Value::Integer(0)),
            |_v: &Value, _args: &[Expr]| Ok(Value::Integer(0)),
            |_e: &Expr, _cols: &[DataFrameColumn], _row: usize| Ok(Value::Integer(0)),
        );
        assert!(result.is_ok());
        assert_eq!(result.expect("should work"), Value::Float(4.0));
    }

    // Test R127-35: dataframe sum with non-numeric (should skip)
    #[test]
    fn test_dataframe_sum_with_strings_r127() {
        let columns = vec![DataFrameColumn {
            name: "mixed".to_string(),
            values: vec![
                Value::Integer(1),
                Value::from_string("skip".to_string()),
                Value::Integer(2),
            ],
        }];
        let result = eval_dataframe_sum(&columns, &[]).expect("should work");
        assert_eq!(result, Value::Float(3.0));
    }

    // Test R127-36: dataframe mean with non-numeric (should skip)
    #[test]
    fn test_dataframe_mean_with_strings_r127() {
        let columns = vec![DataFrameColumn {
            name: "mixed".to_string(),
            values: vec![
                Value::Integer(2),
                Value::from_string("skip".to_string()),
                Value::Integer(4),
            ],
        }];
        let result = eval_dataframe_mean(&columns, &[]).expect("should work");
        assert_eq!(result, Value::Float(3.0));
    }

    // Test R127-37: dataframe max with strings (should skip)
    #[test]
    fn test_dataframe_max_with_strings_r127() {
        let columns = vec![DataFrameColumn {
            name: "mixed".to_string(),
            values: vec![
                Value::Integer(5),
                Value::from_string("skip".to_string()),
                Value::Integer(10),
            ],
        }];
        let result = eval_dataframe_max(&columns, &[]).expect("should work");
        assert_eq!(result, Value::Float(10.0));
    }

    // Test R127-38: dataframe min with strings (should skip)
    #[test]
    fn test_dataframe_min_with_strings_r127() {
        let columns = vec![DataFrameColumn {
            name: "mixed".to_string(),
            values: vec![
                Value::Integer(5),
                Value::from_string("skip".to_string()),
                Value::Integer(3),
            ],
        }];
        let result = eval_dataframe_min(&columns, &[]).expect("should work");
        assert_eq!(result, Value::Float(3.0));
    }