aboutsummaryrefslogtreecommitdiff
path: root/libbuild2/test/script/script.cxx
blob: b879eb422bfb8274416fb9af935adac949460e3c (plain)
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
// file      : libbuild2/test/script/script.cxx -*- C++ -*-
// copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
// license   : MIT; see accompanying LICENSE file

#include <libbuild2/test/script/script.hxx>

#include <sstream>

#include <libbuild2/target.hxx>
#include <libbuild2/algorithm.hxx>

using namespace std;

namespace build2
{
  namespace test
  {
    namespace script
    {
      ostream&
      operator<< (ostream& o, line_type lt)
      {
        const char* s (nullptr);

        switch (lt)
        {
        case line_type::var:       s = "variable"; break;
        case line_type::cmd:       s = "command";  break;
        case line_type::cmd_if:    s = "'if'";     break;
        case line_type::cmd_ifn:   s = "'if!'";    break;
        case line_type::cmd_elif:  s = "'elif'";   break;
        case line_type::cmd_elifn: s = "'elif!'";  break;
        case line_type::cmd_else:  s = "'else'";   break;
        case line_type::cmd_end:   s = "'end'";    break;
        }

        return o << s;
      }

      // Quote if empty or contains spaces or any of the special characters.
      // Note that we use single quotes since double quotes still allow
      // expansion.
      //
      // @@ What if it contains single quotes?
      //
      static void
      to_stream_q (ostream& o, const string& s)
      {
        if (s.empty () || s.find_first_of (" |&<>=\\\"") != string::npos)
          o << '\'' << s << '\'';
        else
          o << s;
      };

      void
      to_stream (ostream& o, const command& c, command_to_stream m)
      {
        auto print_path = [&o] (const path& p)
        {
          using build2::operator<<;

          ostringstream s;
          stream_verb (s, stream_verb (o));
          s << p;

          to_stream_q (o, s.str ());
        };

        auto print_redirect =
          [&o, print_path] (const redirect& r, const char* prefix)
        {
          o << ' ' << prefix;

          size_t n (string::traits_type::length (prefix));
          assert (n > 0);

          char d (prefix[n - 1]); // Redirect direction.

          switch (r.type)
          {
          case redirect_type::none:  assert (false);   break;
          case redirect_type::pass:  o << '|';         break;
          case redirect_type::null:  o << '-';         break;
          case redirect_type::trace: o << '!';         break;
          case redirect_type::merge: o << '&' << r.fd; break;

          case redirect_type::here_str_literal:
          case redirect_type::here_doc_literal:
            {
              bool doc (r.type == redirect_type::here_doc_literal);

              // For here-document add another '>' or '<'. Note that here end
              // marker never needs to be quoted.
              //
              if (doc)
                o << d;

              o << r.modifiers;

              if (doc)
                o << r.end;
              else
              {
                const string& v (r.str);
                to_stream_q (o,
                             r.modifiers.find (':') == string::npos
                             ? string (v, 0, v.size () - 1) // Strip newline.
                             : v);
              }

              break;
            }

          case redirect_type::here_str_regex:
          case redirect_type::here_doc_regex:
            {
              bool doc (r.type == redirect_type::here_doc_regex);

              // For here-document add another '>' or '<'. Note that here end
              // marker never needs to be quoted.
              //
              if (doc)
                o << d;

              o << r.modifiers;

              const regex_lines& re (r.regex);

              if (doc)
                o << re.intro + r.end + re.intro + re.flags;
              else
              {
                assert (!re.lines.empty ()); // Regex can't be empty.

                regex_line l (re.lines[0]);
                to_stream_q (o, re.intro + l.value + re.intro + l.flags);
              }

              break;
            }

          case redirect_type::file:
            {
              // For stdin or stdout-comparison redirect add '>>' or '<<' (and
              // so make it '<<<' or '>>>'). Otherwise add '+' or '=' (and so
              // make it '>+' or '>=').
              //
              if (d == '<' || r.file.mode == redirect_fmode::compare)
                o << d << d;
              else
                o << (r.file.mode == redirect_fmode::append ? '+' : '=');

              print_path (r.file.path);
              break;
            }

          case redirect_type::here_doc_ref: assert (false); break;
          }
        };

        auto print_doc = [&o] (const redirect& r)
        {
          o << endl;

          if (r.type == redirect_type::here_doc_literal)
            o << r.str;
          else
          {
            assert (r.type == redirect_type::here_doc_regex);

            const regex_lines& rl (r.regex);

            for (auto b (rl.lines.cbegin ()), i (b), e (rl.lines.cend ());
                 i != e; ++i)
            {
              if (i != b)
                o << endl;

              const regex_line& l (*i);

              if (l.regex)                  // Regex (possibly empty),
                o << rl.intro << l.value << rl.intro << l.flags;
              else if (!l.special.empty ()) // Special literal.
                o << rl.intro;
              else                          // Textual literal.
                o << l.value;

              o << l.special;
            }
          }

          o << (r.modifiers.find (':') == string::npos ? "" : "\n") << r.end;
        };

        if ((m & command_to_stream::header) == command_to_stream::header)
        {
          // Program.
          //
          to_stream_q (o, c.program.string ());

          // Arguments.
          //
          for (const string& a: c.arguments)
          {
            o << ' ';
            to_stream_q (o, a);
          }

          // Redirects.
          //
          if (c.in.effective ().type  != redirect_type::none)
            print_redirect (c.in.effective (), "<");

          if (c.out.effective ().type != redirect_type::none)
            print_redirect (c.out.effective (),  ">");

          if (c.err.effective ().type != redirect_type::none)
            print_redirect (c.err.effective (), "2>");

          for (const auto& p: c.cleanups)
          {
            o << " &";

            if (p.type != cleanup_type::always)
              o << (p.type == cleanup_type::maybe ? '?' : '!');

            print_path (p.path);
          }

          if (c.exit.comparison != exit_comparison::eq || c.exit.code != 0)
          {
            switch (c.exit.comparison)
            {
            case exit_comparison::eq: o << " == "; break;
            case exit_comparison::ne: o << " != "; break;
            }

            o << static_cast<uint16_t> (c.exit.code);
          }
        }

        if ((m & command_to_stream::here_doc) == command_to_stream::here_doc)
        {
          // Here-documents.
          //
          if (c.in.type == redirect_type::here_doc_literal ||
              c.in.type == redirect_type::here_doc_regex)
            print_doc (c.in);

          if (c.out.type == redirect_type::here_doc_literal ||
              c.out.type == redirect_type::here_doc_regex)
            print_doc (c.out);

          if (c.err.type == redirect_type::here_doc_literal ||
              c.err.type == redirect_type::here_doc_regex)
            print_doc (c.err);
        }
      }

      void
      to_stream (ostream& o, const command_pipe& p, command_to_stream m)
      {
        if ((m & command_to_stream::header) == command_to_stream::header)
        {
          for (auto b (p.begin ()), i (b); i != p.end (); ++i)
          {
            if (i != b)
              o << " | ";

            to_stream (o, *i, command_to_stream::header);
          }
        }

        if ((m & command_to_stream::here_doc) == command_to_stream::here_doc)
        {
          for (const command& c: p)
            to_stream (o, c, command_to_stream::here_doc);
        }
      }

      void
      to_stream (ostream& o, const command_expr& e, command_to_stream m)
      {
        if ((m & command_to_stream::header) == command_to_stream::header)
        {
          for (auto b (e.begin ()), i (b); i != e.end (); ++i)
          {
            if (i != b)
            {
              switch (i->op)
              {
              case expr_operator::log_or:  o << " || "; break;
              case expr_operator::log_and: o << " && "; break;
              }
            }

            to_stream (o, i->pipe, command_to_stream::header);
          }
        }

        if ((m & command_to_stream::here_doc) == command_to_stream::here_doc)
        {
          for (const expr_term& t: e)
            to_stream (o, t.pipe, command_to_stream::here_doc);
        }
      }

      // redirect
      //
      redirect::
      redirect (redirect_type t)
          : type (t)
      {
        switch (type)
        {
        case redirect_type::none:
        case redirect_type::pass:
        case redirect_type::null:
        case redirect_type::trace:
        case redirect_type::merge: break;

        case redirect_type::here_str_literal:
        case redirect_type::here_doc_literal: new (&str) string (); break;

        case redirect_type::here_str_regex:
        case redirect_type::here_doc_regex:
          {
            new (&regex) regex_lines ();
            break;
          }

        case redirect_type::file: new (&file) file_type (); break;

        case redirect_type::here_doc_ref: assert (false); break;
        }
      }

      redirect::
      redirect (redirect&& r)
          : type (r.type),
            modifiers (move (r.modifiers)),
            end (move (r.end)),
            end_line (r.end_line),
            end_column (r.end_column)
      {
        switch (type)
        {
        case redirect_type::none:
        case redirect_type::pass:
        case redirect_type::null:
        case redirect_type::trace: break;

        case redirect_type::merge: fd = r.fd; break;

        case redirect_type::here_str_literal:
        case redirect_type::here_doc_literal:
          {
            new (&str) string (move (r.str));
            break;
          }
        case redirect_type::here_str_regex:
        case redirect_type::here_doc_regex:
          {
            new (&regex) regex_lines (move (r.regex));
            break;
          }
        case redirect_type::file:
          {
            new (&file) file_type (move (r.file));
            break;
          }
        case redirect_type::here_doc_ref:
          {
            new (&ref) reference_wrapper<const redirect> (r.ref);
            break;
          }
        }
      }

      redirect::
      ~redirect ()
      {
        switch (type)
        {
        case redirect_type::none:
        case redirect_type::pass:
        case redirect_type::null:
        case redirect_type::trace:
        case redirect_type::merge: break;

        case redirect_type::here_str_literal:
        case redirect_type::here_doc_literal: str.~string (); break;

        case redirect_type::here_str_regex:
        case redirect_type::here_doc_regex: regex.~regex_lines (); break;

        case redirect_type::file: file.~file_type (); break;

        case redirect_type::here_doc_ref:
          {
            ref.~reference_wrapper<const redirect> ();
            break;
          }
        }
      }

      redirect& redirect::
      operator= (redirect&& r)
      {
        if (this != &r)
        {
          this->~redirect ();
          new (this) redirect (move (r)); // Assume noexcept move-constructor.
        }
        return *this;
      }

      // scope
      //
      scope::
      scope (const string& id, scope* p, script* r)
          : parent (p),
            root (r),
            vars (false /* global */),
            id_path (cast<path> (assign (root->id_var) = path ())),
            wd_path (cast<dir_path> (assign (root->wd_var) = dir_path ()))

      {
        // Construct the id_path as a string to ensure POSIX form. In fact,
        // the only reason we keep it as a path is to be able to easily get id
        // by calling leaf().
        //
        {
          string s (p != nullptr ? p->id_path.string () : string ());

          if (!s.empty () && !id.empty ())
            s += '/';

          s += id;
          const_cast<path&> (id_path) = path (move (s));
        }

        // Calculate the working directory path unless this is the root scope
        // (handled in an ad hoc way).
        //
        if (p != nullptr)
          const_cast<dir_path&> (wd_path) = dir_path (p->wd_path) /= id;
      }

      void scope::
      clean (cleanup c, bool implicit)
      {
        using std::find; // Hidden by scope::find().

        assert (!implicit || c.type == cleanup_type::always);

        const path& p (c.path);
        if (!p.sub (root->wd_path))
        {
          if (implicit)
            return;
          else
            assert (false); // Error so should have been checked.
        }

        auto pr = [&p] (const cleanup& v) -> bool {return v.path == p;};
        auto i (find_if (cleanups.begin (), cleanups.end (), pr));

        if (i == cleanups.end ())
          cleanups.emplace_back (move (c));
        else if (!implicit)
          i->type = c.type;
      }

      void scope::
      clean_special (path p)
      {
        special_cleanups.emplace_back (move (p));
      }

      // script_base
      //
      script_base::
      script_base ()
          : // Enter the test.* variables with the same variable types as in
            // buildfiles except for test: while in buildfiles it can be a
            // target name, in testscripts it should be resolved to a path.
            //
            // Note: entering in a custom variable pool.
            //
            test_var      (var_pool.insert<path> ("test")),
            options_var   (var_pool.insert<strings> ("test.options")),
            arguments_var (var_pool.insert<strings> ("test.arguments")),
            redirects_var (var_pool.insert<strings> ("test.redirects")),
            cleanups_var  (var_pool.insert<strings> ("test.cleanups")),

            wd_var (var_pool.insert<dir_path> ("~")),
            id_var (var_pool.insert<path> ("@")),
            cmd_var (var_pool.insert<strings> ("*")),
            cmdN_var {
              &var_pool.insert<path> ("0"),
              &var_pool.insert<string> ("1"),
              &var_pool.insert<string> ("2"),
              &var_pool.insert<string> ("3"),
              &var_pool.insert<string> ("4"),
              &var_pool.insert<string> ("5"),
              &var_pool.insert<string> ("6"),
              &var_pool.insert<string> ("7"),
              &var_pool.insert<string> ("8"),
              &var_pool.insert<string> ("9")} {}

      // script
      //
      script::
      script (const target& tt,
              const testscript& st,
              const dir_path& rwd)
          : group (st.name == "testscript" ? string () : st.name, this),
            test_target (tt),
            target_scope (tt.base_scope ()),
            script_target (st)
      {
        // Set the script working dir ($~) to $out_base/test/<id> (id_path
        // for root is just the id which is empty if st is 'testscript').
        //
        const_cast<dir_path&> (wd_path) = dir_path (rwd) /= id_path.string ();

        // Set the test variable at the script level. We do it even if it's
        // set in the buildfile since they use different types.
        //
        {
          value& v (assign (test_var));

          // Note that the test variable's visibility is target.
          //
          lookup l (find_in_buildfile ("test", false));

          // Note that we have similar code for simple tests.
          //
          const target* t (nullptr);

          if (l.defined ())
          {
            const name* n (cast_null<name> (l));

            if (n == nullptr)
              v = nullptr;
            else if (n->empty ())
              v = path ();
            else if (n->simple ())
            {
              // Ignore the special 'true' value.
              //
              if (n->value != "true")
                v = path (n->value);
              else
                t = &tt;
            }
            else if (n->directory ())
              v = path (n->dir);
            else
            {
              // Must be a target name.
              //
              // @@ OUT: what if this is a @-qualified pair of names?
              //
              t = search_existing (*n, target_scope);

              if (t == nullptr)
                fail << "unknown target '" << *n << "' in test variable";
            }
          }
          else
            // By default we set it to the test target's path.
            //
            t = &tt;

          // If this is a path-based target, then we use the path. If this
          // is an alias target (e.g., dir{}), then we use the directory
          // path. Otherwise, we leave it NULL expecting the testscript to
          // set it to something appropriate, if used.
          //
          if (t != nullptr)
          {
            if (auto* pt = t->is_a<path_target> ())
            {
              // Do some sanity checks: the target better be up-to-date with
              // an assigned path.
              //
              v = pt->path ();

              if (v.empty ())
                fail << "target " << *pt << " specified in the test variable "
                     << "is out of date" <<
                  info << "consider specifying it as a prerequisite of " << tt;
            }
            else if (t->is_a<alias> ())
              v = path (t->dir);
            else if (t != &tt)
              fail << "target " << *t << " specified in the test variable "
                   << "is not path-based";
          }
        }

        // Set the special $*, $N variables.
        //
        reset_special ();
      }

      lookup scope::
      find (const variable& var) const
      {
        // Search script scopes until we hit the root.
        //
        const scope* s (this);

        do
        {
          auto p (s->vars.find (var));
          if (p.first != nullptr)
            return lookup (*p.first, p.second, s->vars);
        }
        while ((s->parent != nullptr ? (s = s->parent) : nullptr) != nullptr);

        return find_in_buildfile (var.name);
      }


      lookup scope::
      find_in_buildfile (const string& n, bool target_only) const
      {
        // Switch to the corresponding buildfile variable. Note that we don't
        // want to insert a new variable into the pool (we might be running
        // in parallel). Plus, if there is no such variable, then we cannot
        // possibly find any value.
        //
        const variable* pvar (build2::var_pool.find (n));

        if (pvar == nullptr)
          return lookup ();

        const script& s (static_cast<const script&> (*root));
        const variable& var (*pvar);

        // First check the target we are testing.
        //
        {
          // Note that we skip applying the override if we did not find any
          // value. In this case, presumably the override also affects the
          // script target and we will pick it up there. A bit fuzzy.
          //
          auto p (s.test_target.find_original (var, target_only));

          if (p.first)
          {
            if (var.overrides != nullptr)
              p = s.target_scope.find_override (var, move (p), true);

            return p.first;
          }
        }

        // Then the script target followed by the scopes it is in. Note that
        // while unlikely it is possible the test and script targets will be
        // in different scopes which brings the question of which scopes we
        // should search.
        //
        return s.script_target[var];
      }

      value& scope::
      append (const variable& var)
      {
        lookup l (find (var));

        if (l.defined () && l.belongs (*this)) // Existing var in this scope.
          return vars.modify (l);

        value& r (assign (var)); // NULL.

        if (l.defined ())
          r = *l; // Copy value (and type) from the outer scope.

        return r;
      }

      void scope::
      reset_special ()
      {
        // First assemble the $* value.
        //
        strings s;

        auto append = [&s] (const strings& v)
        {
          s.insert (s.end (), v.begin (), v.end ());
        };

        if (lookup l = find (root->test_var))
          s.push_back (cast<path> (l).representation ());

        if (lookup l = find (root->options_var))
          append (cast<strings> (l));

        if (lookup l = find (root->arguments_var))
          append (cast<strings> (l));

        // Keep redirects/cleanups out of $N.
        //
        size_t n (s.size ());

        if (lookup l = find (root->redirects_var))
          append (cast<strings> (l));

        if (lookup l = find (root->cleanups_var))
          append (cast<strings> (l));

        // Set the $N values if present.
        //
        for (size_t i (0); i <= 9; ++i)
        {
          value& v (assign (*root->cmdN_var[i]));

          if (i < n)
          {
            if (i == 0)
              v = path (s[i]);
            else
              v = s[i];
          }
          else
            v = nullptr; // Clear any old values.
        }

        // Set $*.
        //
        assign (root->cmd_var) = move (s);
      }
    }
  }
}