/usr/lib/ocaml/menhirLib/menhirLib.mli is in libmenhir-ocaml-dev 20171222-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 | module General : sig
(******************************************************************************)
(* *)
(* Menhir *)
(* *)
(* François Pottier, Inria Paris *)
(* Yann Régis-Gianas, PPS, Université Paris Diderot *)
(* *)
(* Copyright Inria. All rights reserved. This file is distributed under the *)
(* terms of the GNU Library General Public License version 2, with a *)
(* special exception on linking, as described in the file LICENSE. *)
(* *)
(******************************************************************************)
(* This module offers general-purpose functions on lists and streams. *)
(* As of 2017/03/31, this module is DEPRECATED. It might be removed in
the future. *)
(* --------------------------------------------------------------------------- *)
(* Lists. *)
(* [take n xs] returns the [n] first elements of the list [xs]. It is
acceptable for the list [xs] to have length less than [n], in
which case [xs] itself is returned. *)
val take: int -> 'a list -> 'a list
(* [drop n xs] returns the list [xs], deprived of its [n] first elements.
It is acceptable for the list [xs] to have length less than [n], in
which case an empty list is returned. *)
val drop: int -> 'a list -> 'a list
(* [uniq cmp xs] assumes that the list [xs] is sorted according to the
ordering [cmp] and returns the list [xs] deprived of any duplicate
elements. *)
val uniq: ('a -> 'a -> int) -> 'a list -> 'a list
(* [weed cmp xs] returns the list [xs] deprived of any duplicate elements. *)
val weed: ('a -> 'a -> int) -> 'a list -> 'a list
(* --------------------------------------------------------------------------- *)
(* A stream is a list whose elements are produced on demand. *)
type 'a stream =
'a head Lazy.t
and 'a head =
| Nil
| Cons of 'a * 'a stream
(* The length of a stream. *)
val length: 'a stream -> int
(* Folding over a stream. *)
val foldr: ('a -> 'b -> 'b) -> 'a stream -> 'b -> 'b
end
module Convert : sig
(******************************************************************************)
(* *)
(* Menhir *)
(* *)
(* François Pottier, Inria Paris *)
(* Yann Régis-Gianas, PPS, Université Paris Diderot *)
(* *)
(* Copyright Inria. All rights reserved. This file is distributed under the *)
(* terms of the GNU Library General Public License version 2, with a *)
(* special exception on linking, as described in the file LICENSE. *)
(* *)
(******************************************************************************)
(* An ocamlyacc-style, or Menhir-style, parser requires access to
the lexer, which must be parameterized with a lexing buffer, and
to the lexing buffer itself, where it reads position information. *)
(* This traditional API is convenient when used with ocamllex, but
inelegant when used with other lexer generators. *)
type ('token, 'semantic_value) traditional =
(Lexing.lexbuf -> 'token) -> Lexing.lexbuf -> 'semantic_value
(* This revised API is independent of any lexer generator. Here, the
parser only requires access to the lexer, and the lexer takes no
parameters. The tokens returned by the lexer may contain position
information. *)
type ('token, 'semantic_value) revised =
(unit -> 'token) -> 'semantic_value
(* --------------------------------------------------------------------------- *)
(* Converting a traditional parser, produced by ocamlyacc or Menhir,
into a revised parser. *)
(* A token of the revised lexer is essentially a triple of a token
of the traditional lexer (or raw token), a start position, and
and end position. The three [get] functions are accessors. *)
(* We do not require the type ['token] to actually be a triple type.
This enables complex applications where it is a record type with
more than three fields. It also enables simple applications where
positions are of no interest, so ['token] is just ['raw_token]
and [get_startp] and [get_endp] return dummy positions. *)
val traditional2revised:
('token -> 'raw_token) ->
('token -> Lexing.position) ->
('token -> Lexing.position) ->
('raw_token, 'semantic_value) traditional ->
('token, 'semantic_value) revised
(* --------------------------------------------------------------------------- *)
(* Converting a revised parser back to a traditional parser. *)
val revised2traditional:
('raw_token -> Lexing.position -> Lexing.position -> 'token) ->
('token, 'semantic_value) revised ->
('raw_token, 'semantic_value) traditional
(* --------------------------------------------------------------------------- *)
(* Simplified versions of the above, where concrete triples are used. *)
module Simplified : sig
val traditional2revised:
('token, 'semantic_value) traditional ->
('token * Lexing.position * Lexing.position, 'semantic_value) revised
val revised2traditional:
('token * Lexing.position * Lexing.position, 'semantic_value) revised ->
('token, 'semantic_value) traditional
end
end
module IncrementalEngine : sig
(******************************************************************************)
(* *)
(* Menhir *)
(* *)
(* François Pottier, Inria Paris *)
(* Yann Régis-Gianas, PPS, Université Paris Diderot *)
(* *)
(* Copyright Inria. All rights reserved. This file is distributed under the *)
(* terms of the GNU Library General Public License version 2, with a *)
(* special exception on linking, as described in the file LICENSE. *)
(* *)
(******************************************************************************)
type position = Lexing.position
open General
(* This signature describes the incremental LR engine. *)
(* In this mode, the user controls the lexer, and the parser suspends
itself when it needs to read a new token. *)
module type INCREMENTAL_ENGINE = sig
type token
(* A value of type [production] is (an index for) a production. The start
productions (which do not exist in an \mly file, but are constructed by
Menhir internally) are not part of this type. *)
type production
(* The type ['a checkpoint] represents an intermediate or final state of the
parser. An intermediate checkpoint is a suspension: it records the parser's
current state, and allows parsing to be resumed. The parameter ['a] is
the type of the semantic value that will eventually be produced if the
parser succeeds. *)
(* [Accepted] and [Rejected] are final checkpoints. [Accepted] carries a
semantic value. *)
(* [InputNeeded] is an intermediate checkpoint. It means that the parser wishes
to read one token before continuing. *)
(* [Shifting] is an intermediate checkpoint. It means that the parser is taking
a shift transition. It exposes the state of the parser before and after
the transition. The Boolean parameter tells whether the parser intends to
request a new token after this transition. (It always does, except when
it is about to accept.) *)
(* [AboutToReduce] is an intermediate checkpoint. It means that the parser is
about to perform a reduction step. It exposes the parser's current
state as well as the production that is about to be reduced. *)
(* [HandlingError] is an intermediate checkpoint. It means that the parser has
detected an error and is currently handling it, in several steps. *)
(* A value of type ['a env] represents a configuration of the automaton:
current state, stack, lookahead token, etc. The parameter ['a] is the
type of the semantic value that will eventually be produced if the parser
succeeds. *)
(* In normal operation, the parser works with checkpoints: see the functions
[offer] and [resume]. However, it is also possible to work directly with
environments (see the functions [pop], [force_reduction], and [feed]) and
to reconstruct a checkpoint out of an environment (see [input_needed]).
This is considered advanced functionality; its purpose is to allow error
recovery strategies to be programmed by the user. *)
type 'a env
type 'a checkpoint = private
| InputNeeded of 'a env
| Shifting of 'a env * 'a env * bool
| AboutToReduce of 'a env * production
| HandlingError of 'a env
| Accepted of 'a
| Rejected
(* [offer] allows the user to resume the parser after it has suspended
itself with a checkpoint of the form [InputNeeded env]. [offer] expects the
old checkpoint as well as a new token and produces a new checkpoint. It does not
raise any exception. *)
val offer:
'a checkpoint ->
token * position * position ->
'a checkpoint
(* [resume] allows the user to resume the parser after it has suspended
itself with a checkpoint of the form [AboutToReduce (env, prod)] or
[HandlingError env]. [resume] expects the old checkpoint and produces a new
checkpoint. It does not raise any exception. *)
val resume:
'a checkpoint ->
'a checkpoint
(* A token supplier is a function of no arguments which delivers a new token
(together with its start and end positions) every time it is called. *)
type supplier =
unit -> token * position * position
(* A pair of a lexer and a lexing buffer can be easily turned into a supplier. *)
val lexer_lexbuf_to_supplier:
(Lexing.lexbuf -> token) ->
Lexing.lexbuf ->
supplier
(* The functions [offer] and [resume] are sufficient to write a parser loop.
One can imagine many variations (which is why we expose these functions
in the first place!). Here, we expose a few variations of the main loop,
ready for use. *)
(* [loop supplier checkpoint] begins parsing from [checkpoint], reading
tokens from [supplier]. It continues parsing until it reaches a
checkpoint of the form [Accepted v] or [Rejected]. In the former case, it
returns [v]. In the latter case, it raises the exception [Error]. *)
val loop: supplier -> 'a checkpoint -> 'a
(* [loop_handle succeed fail supplier checkpoint] begins parsing from
[checkpoint], reading tokens from [supplier]. It continues parsing until
it reaches a checkpoint of the form [Accepted v] or [HandlingError env]
(or [Rejected], but that should not happen, as [HandlingError _] will be
observed first). In the former case, it calls [succeed v]. In the latter
case, it calls [fail] with this checkpoint. It cannot raise [Error].
This means that Menhir's traditional error-handling procedure (which pops
the stack until a state that can act on the [error] token is found) does
not get a chance to run. Instead, the user can implement her own error
handling code, in the [fail] continuation. *)
val loop_handle:
('a -> 'answer) ->
('a checkpoint -> 'answer) ->
supplier -> 'a checkpoint -> 'answer
(* [loop_handle_undo] is analogous to [loop_handle], except it passes a pair
of checkpoints to the failure continuation.
The first (and oldest) checkpoint is the last [InputNeeded] checkpoint that
was encountered before the error was detected. The second (and newest)
checkpoint is where the error was detected, as in [loop_handle]. Going back
to the first checkpoint can be thought of as undoing any reductions that
were performed after seeing the problematic token. (These reductions must
be default reductions or spurious reductions.)
[loop_handle_undo] must initially be applied to an [InputNeeded] checkpoint.
The parser's initial checkpoints satisfy this constraint. *)
val loop_handle_undo:
('a -> 'answer) ->
('a checkpoint -> 'a checkpoint -> 'answer) ->
supplier -> 'a checkpoint -> 'answer
(* [shifts checkpoint] assumes that [checkpoint] has been obtained by
submitting a token to the parser. It runs the parser from [checkpoint],
through an arbitrary number of reductions, until the parser either
accepts this token (i.e., shifts) or rejects it (i.e., signals an error).
If the parser decides to shift, then [Some env] is returned, where [env]
is the parser's state just before shifting. Otherwise, [None] is
returned. *)
(* It is desirable that the semantic actions be side-effect free, or that
their side-effects be harmless (replayable). *)
val shifts: 'a checkpoint -> 'a env option
(* The function [acceptable] allows testing, after an error has been
detected, which tokens would have been accepted at this point. It is
implemented using [shifts]. Its argument should be an [InputNeeded]
checkpoint. *)
(* For completeness, one must undo any spurious reductions before carrying out
this test -- that is, one must apply [acceptable] to the FIRST checkpoint
that is passed by [loop_handle_undo] to its failure continuation. *)
(* This test causes some semantic actions to be run! The semantic actions
should be side-effect free, or their side-effects should be harmless. *)
(* The position [pos] is used as the start and end positions of the
hypothetical token, and may be picked up by the semantic actions. We
suggest using the position where the error was detected. *)
val acceptable: 'a checkpoint -> token -> position -> bool
(* The abstract type ['a lr1state] describes the non-initial states of the
LR(1) automaton. The index ['a] represents the type of the semantic value
associated with this state's incoming symbol. *)
type 'a lr1state
(* The states of the LR(1) automaton are numbered (from 0 and up). *)
val number: _ lr1state -> int
(* Productions are numbered. *)
(* [find_production i] requires the index [i] to be valid. Use with care. *)
val production_index: production -> int
val find_production: int -> production
(* An element is a pair of a non-initial state [s] and a semantic value [v]
associated with the incoming symbol of this state. The idea is, the value
[v] was pushed onto the stack just before the state [s] was entered. Thus,
for some type ['a], the state [s] has type ['a lr1state] and the value [v]
has type ['a]. In other words, the type [element] is an existential type. *)
type element =
| Element: 'a lr1state * 'a * position * position -> element
(* The parser's stack is (or, more precisely, can be viewed as) a stream of
elements. The type [stream] is defined by the module [General]. *)
(* As of 2017/03/31, the types [stream] and [stack] and the function [stack]
are DEPRECATED. They might be removed in the future. An alternative way
of inspecting the stack is via the functions [top] and [pop]. *)
type stack = (* DEPRECATED *)
element stream
(* This is the parser's stack, a stream of elements. This stream is empty if
the parser is in an initial state; otherwise, it is non-empty. The LR(1)
automaton's current state is the one found in the top element of the
stack. *)
val stack: 'a env -> stack (* DEPRECATED *)
(* [top env] returns the parser's top stack element. The state contained in
this stack element is the current state of the automaton. If the stack is
empty, [None] is returned. In that case, the current state of the
automaton must be an initial state. *)
val top: 'a env -> element option
(* [pop_many i env] pops [i] cells off the automaton's stack. This is done
via [i] successive invocations of [pop]. Thus, [pop_many 1] is [pop]. The
index [i] must be nonnegative. The time complexity is O(i). *)
val pop_many: int -> 'a env -> 'a env option
(* [get i env] returns the parser's [i]-th stack element. The index [i] is
0-based: thus, [get 0] is [top]. If [i] is greater than or equal to the
number of elements in the stack, [None] is returned. The time complexity
is O(i). *)
val get: int -> 'a env -> element option
(* [current_state_number env] is (the integer number of) the automaton's
current state. This works even if the automaton's stack is empty, in
which case the current state is an initial state. This number can be
passed as an argument to a [message] function generated by [menhir
--compile-errors]. *)
val current_state_number: 'a env -> int
(* [equal env1 env2] tells whether the parser configurations [env1] and
[env2] are equal in the sense that the automaton's current state is the
same in [env1] and [env2] and the stack is *physically* the same in
[env1] and [env2]. If [equal env1 env2] is [true], then the sequence of
the stack elements, as observed via [pop] and [top], must be the same in
[env1] and [env2]. Also, if [equal env1 env2] holds, then the checkpoints
[input_needed env1] and [input_needed env2] must be equivalent. The
function [equal] has time complexity O(1). *)
val equal: 'a env -> 'a env -> bool
(* These are the start and end positions of the current lookahead token. If
invoked in an initial state, this function returns a pair of twice the
initial position. *)
val positions: 'a env -> position * position
(* When applied to an environment taken from a checkpoint of the form
[AboutToReduce (env, prod)], the function [env_has_default_reduction]
tells whether the reduction that is about to take place is a default
reduction. *)
val env_has_default_reduction: 'a env -> bool
(* [state_has_default_reduction s] tells whether the state [s] has a default
reduction. This includes the case where [s] is an accepting state. *)
val state_has_default_reduction: _ lr1state -> bool
(* [pop env] returns a new environment, where the parser's top stack cell
has been popped off. (If the stack is empty, [None] is returned.) This
amounts to pretending that the (terminal or nonterminal) symbol that
corresponds to this stack cell has not been read. *)
val pop: 'a env -> 'a env option
(* [force_reduction prod env] should be called only if in the state [env]
the parser is capable of reducing the production [prod]. If this
condition is satisfied, then this production is reduced, which means that
its semantic action is executed (this can have side effects!) and the
automaton makes a goto (nonterminal) transition. If this condition is not
satisfied, [Invalid_argument _] is raised. *)
val force_reduction: production -> 'a env -> 'a env
(* [input_needed env] returns [InputNeeded env]. That is, out of an [env]
that might have been obtained via a series of calls to the functions
[pop], [force_reduction], [feed], etc., it produces a checkpoint, which
can be used to resume normal parsing, by supplying this checkpoint as an
argument to [offer]. *)
(* This function should be used with some care. It could "mess up the
lookahead" in the sense that it allows parsing to resume in an arbitrary
state [s] with an arbitrary lookahead symbol [t], even though Menhir's
reachability analysis (menhir --list-errors) might well think that it is
impossible to reach this particular configuration. If one is using
Menhir's new error reporting facility, this could cause the parser to
reach an error state for which no error message has been prepared. *)
val input_needed: 'a env -> 'a checkpoint
end
(* This signature is a fragment of the inspection API that is made available
to the user when [--inspection] is used. This fragment contains type
definitions for symbols. *)
module type SYMBOLS = sig
(* The type ['a terminal] represents a terminal symbol. The type ['a
nonterminal] represents a nonterminal symbol. In both cases, the index
['a] represents the type of the semantic values associated with this
symbol. The concrete definitions of these types are generated. *)
type 'a terminal
type 'a nonterminal
(* The type ['a symbol] represents a terminal or nonterminal symbol. It is
the disjoint union of the types ['a terminal] and ['a nonterminal]. *)
type 'a symbol =
| T : 'a terminal -> 'a symbol
| N : 'a nonterminal -> 'a symbol
(* The type [xsymbol] is an existentially quantified version of the type
['a symbol]. This type is useful in situations where the index ['a]
is not statically known. *)
type xsymbol =
| X : 'a symbol -> xsymbol
end
(* This signature describes the inspection API that is made available to the
user when [--inspection] is used. *)
module type INSPECTION = sig
(* The types of symbols are described above. *)
include SYMBOLS
(* The type ['a lr1state] is meant to be the same as in [INCREMENTAL_ENGINE]. *)
type 'a lr1state
(* The type [production] is meant to be the same as in [INCREMENTAL_ENGINE].
It represents a production of the grammar. A production can be examined
via the functions [lhs] and [rhs] below. *)
type production
(* An LR(0) item is a pair of a production [prod] and a valid index [i] into
this production. That is, if the length of [rhs prod] is [n], then [i] is
comprised between 0 and [n], inclusive. *)
type item =
production * int
(* Ordering functions. *)
val compare_terminals: _ terminal -> _ terminal -> int
val compare_nonterminals: _ nonterminal -> _ nonterminal -> int
val compare_symbols: xsymbol -> xsymbol -> int
val compare_productions: production -> production -> int
val compare_items: item -> item -> int
(* [incoming_symbol s] is the incoming symbol of the state [s], that is,
the symbol that the parser must recognize before (has recognized when)
it enters the state [s]. This function gives access to the semantic
value [v] stored in a stack element [Element (s, v, _, _)]. Indeed,
by case analysis on the symbol [incoming_symbol s], one discovers the
type ['a] of the value [v]. *)
val incoming_symbol: 'a lr1state -> 'a symbol
(* [items s] is the set of the LR(0) items in the LR(0) core of the LR(1)
state [s]. This set is not epsilon-closed. This set is presented as a
list, in an arbitrary order. *)
val items: _ lr1state -> item list
(* [lhs prod] is the left-hand side of the production [prod]. This is
always a non-terminal symbol. *)
val lhs: production -> xsymbol
(* [rhs prod] is the right-hand side of the production [prod]. This is
a (possibly empty) sequence of (terminal or nonterminal) symbols. *)
val rhs: production -> xsymbol list
(* [nullable nt] tells whether the non-terminal symbol [nt] is nullable.
That is, it is true if and only if this symbol produces the empty
word [epsilon]. *)
val nullable: _ nonterminal -> bool
(* [first nt t] tells whether the FIRST set of the nonterminal symbol [nt]
contains the terminal symbol [t]. That is, it is true if and only if
[nt] produces a word that begins with [t]. *)
val first: _ nonterminal -> _ terminal -> bool
(* [xfirst] is analogous to [first], but expects a first argument of type
[xsymbol] instead of [_ terminal]. *)
val xfirst: xsymbol -> _ terminal -> bool
(* [foreach_terminal] enumerates the terminal symbols, including [error].
[foreach_terminal_but_error] enumerates the terminal symbols, excluding
[error]. *)
val foreach_terminal: (xsymbol -> 'a -> 'a) -> 'a -> 'a
val foreach_terminal_but_error: (xsymbol -> 'a -> 'a) -> 'a -> 'a
(* The type [env] is meant to be the same as in [INCREMENTAL_ENGINE]. *)
type 'a env
(* [feed symbol startp semv endp env] causes the parser to consume the
(terminal or nonterminal) symbol [symbol], accompanied with the semantic
value [semv] and with the start and end positions [startp] and [endp].
Thus, the automaton makes a transition, and reaches a new state. The
stack grows by one cell. This operation is permitted only if the current
state (as determined by [env]) has an outgoing transition labeled with
[symbol]. Otherwise, [Invalid_argument _] is raised. *)
val feed: 'a symbol -> position -> 'a -> position -> 'b env -> 'b env
end
(* This signature combines the incremental API and the inspection API. *)
module type EVERYTHING = sig
include INCREMENTAL_ENGINE
include INSPECTION
with type 'a lr1state := 'a lr1state
with type production := production
with type 'a env := 'a env
end
end
module EngineTypes : sig
(******************************************************************************)
(* *)
(* Menhir *)
(* *)
(* François Pottier, Inria Paris *)
(* Yann Régis-Gianas, PPS, Université Paris Diderot *)
(* *)
(* Copyright Inria. All rights reserved. This file is distributed under the *)
(* terms of the GNU Library General Public License version 2, with a *)
(* special exception on linking, as described in the file LICENSE. *)
(* *)
(******************************************************************************)
(* This file defines several types and module types that are used in the
specification of module [Engine]. *)
(* --------------------------------------------------------------------------- *)
(* It would be nice if we could keep the structure of stacks and environments
hidden. However, stacks and environments must be accessible to semantic
actions, so the following data structure definitions must be public. *)
(* --------------------------------------------------------------------------- *)
(* A stack is a linked list of cells. A sentinel cell -- which is its own
successor -- is used to mark the bottom of the stack. The sentinel cell
itself is not significant -- it contains dummy values. *)
type ('state, 'semantic_value) stack = {
(* The state that we should go back to if we pop this stack cell. *)
(* This convention means that the state contained in the top stack cell is
not the current state [env.current]. It also means that the state found
within the sentinel is a dummy -- it is never consulted. This convention
is the same as that adopted by the code-based back-end. *)
state: 'state;
(* The semantic value associated with the chunk of input that this cell
represents. *)
semv: 'semantic_value;
(* The start and end positions of the chunk of input that this cell
represents. *)
startp: Lexing.position;
endp: Lexing.position;
(* The next cell down in the stack. If this is a self-pointer, then this
cell is the sentinel, and the stack is conceptually empty. *)
next: ('state, 'semantic_value) stack;
}
(* --------------------------------------------------------------------------- *)
(* A parsing environment contains all of the parser's state (except for the
current program point). *)
type ('state, 'semantic_value, 'token) env = {
(* If this flag is true, then the first component of [env.triple] should
be ignored, as it has been logically overwritten with the [error]
pseudo-token. *)
error: bool;
(* The last token that was obtained from the lexer, together with its start
and end positions. Warning: before the first call to the lexer has taken
place, a dummy (and possibly invalid) token is stored here. *)
triple: 'token * Lexing.position * Lexing.position;
(* The stack. In [CodeBackend], it is passed around on its own,
whereas, here, it is accessed via the environment. *)
stack: ('state, 'semantic_value) stack;
(* The current state. In [CodeBackend], it is passed around on its
own, whereas, here, it is accessed via the environment. *)
current: 'state;
}
(* --------------------------------------------------------------------------- *)
(* This signature describes the parameters that must be supplied to the LR
engine. *)
module type TABLE = sig
(* The type of automaton states. *)
type state
(* States are numbered. *)
val number: state -> int
(* The type of tokens. These can be thought of as real tokens, that is,
tokens returned by the lexer. They carry a semantic value. This type
does not include the [error] pseudo-token. *)
type token
(* The type of terminal symbols. These can be thought of as integer codes.
They do not carry a semantic value. This type does include the [error]
pseudo-token. *)
type terminal
(* The type of nonterminal symbols. *)
type nonterminal
(* The type of semantic values. *)
type semantic_value
(* A token is conceptually a pair of a (non-[error]) terminal symbol and
a semantic value. The following two functions are the pair projections. *)
val token2terminal: token -> terminal
val token2value: token -> semantic_value
(* Even though the [error] pseudo-token is not a real token, it is a
terminal symbol. Furthermore, for regularity, it must have a semantic
value. *)
val error_terminal: terminal
val error_value: semantic_value
(* [foreach_terminal] allows iterating over all terminal symbols. *)
val foreach_terminal: (terminal -> 'a -> 'a) -> 'a -> 'a
(* The type of productions. *)
type production
val production_index: production -> int
val find_production: int -> production
(* If a state [s] has a default reduction on production [prod], then, upon
entering [s], the automaton should reduce [prod] without consulting the
lookahead token. The following function allows determining which states
have default reductions. *)
(* Instead of returning a value of a sum type -- either [DefRed prod], or
[NoDefRed] -- it accepts two continuations, and invokes just one of
them. This mechanism allows avoiding a memory allocation. *)
val default_reduction:
state ->
('env -> production -> 'answer) ->
('env -> 'answer) ->
'env -> 'answer
(* An LR automaton can normally take three kinds of actions: shift, reduce,
or fail. (Acceptance is a particular case of reduction: it consists in
reducing a start production.) *)
(* There are two variants of the shift action. [shift/discard s] instructs
the automaton to discard the current token, request a new one from the
lexer, and move to state [s]. [shift/nodiscard s] instructs it to move to
state [s] without requesting a new token. This instruction should be used
when [s] has a default reduction on [#]. See [CodeBackend.gettoken] for
details. *)
(* This is the automaton's action table. It maps a pair of a state and a
terminal symbol to an action. *)
(* Instead of returning a value of a sum type -- one of shift/discard,
shift/nodiscard, reduce, or fail -- this function accepts three
continuations, and invokes just one them. This mechanism allows avoiding
a memory allocation. *)
(* In summary, the parameters to [action] are as follows:
- the first two parameters, a state and a terminal symbol, are used to
look up the action table;
- the next parameter is the semantic value associated with the above
terminal symbol; it is not used, only passed along to the shift
continuation, as explained below;
- the shift continuation expects an environment; a flag that tells
whether to discard the current token; the terminal symbol that
is being shifted; its semantic value; and the target state of
the transition;
- the reduce continuation expects an environment and a production;
- the fail continuation expects an environment;
- the last parameter is the environment; it is not used, only passed
along to the selected continuation. *)
val action:
state ->
terminal ->
semantic_value ->
('env -> bool -> terminal -> semantic_value -> state -> 'answer) ->
('env -> production -> 'answer) ->
('env -> 'answer) ->
'env -> 'answer
(* This is the automaton's goto table. This table maps a pair of a state
and a nonterminal symbol to a new state. By extension, it also maps a
pair of a state and a production to a new state. *)
(* The function [goto_nt] can be applied to [s] and [nt] ONLY if the state
[s] has an outgoing transition labeled [nt]. Otherwise, its result is
undefined. Similarly, the call [goto_prod prod s] is permitted ONLY if
the state [s] has an outgoing transition labeled with the nonterminal
symbol [lhs prod]. The function [maybe_goto_nt] involves an additional
dynamic check and CAN be called even if there is no outgoing transition. *)
val goto_nt : state -> nonterminal -> state
val goto_prod: state -> production -> state
val maybe_goto_nt: state -> nonterminal -> state option
(* [is_start prod] tells whether the production [prod] is a start production. *)
val is_start: production -> bool
(* By convention, a semantic action is responsible for:
1. fetching whatever semantic values and positions it needs off the stack;
2. popping an appropriate number of cells off the stack, as dictated
by the length of the right-hand side of the production;
3. computing a new semantic value, as well as new start and end positions;
4. pushing a new stack cell, which contains the three values
computed in step 3;
5. returning the new stack computed in steps 2 and 4.
Point 1 is essentially forced upon us: if semantic values were fetched
off the stack by this interpreter, then the calling convention for
semantic actions would be variadic: not all semantic actions would have
the same number of arguments. The rest follows rather naturally. *)
(* Semantic actions are allowed to raise [Error]. *)
exception Error
type semantic_action =
(state, semantic_value, token) env -> (state, semantic_value) stack
val semantic_action: production -> semantic_action
(* [may_reduce state prod] tests whether the state [state] is capable of
reducing the production [prod]. This function is currently costly and
is not used by the core LR engine. It is used in the implementation
of certain functions, such as [force_reduction], which allow the engine
to be driven programmatically. *)
val may_reduce: state -> production -> bool
(* The LR engine requires a number of hooks, which are used for logging. *)
(* The comments below indicate the conventional messages that correspond
to these hooks in the code-based back-end; see [CodeBackend]. *)
(* If the flag [log] is false, then the logging functions are not called.
If it is [true], then they are called. *)
val log : bool
module Log : sig
(* State %d: *)
val state: state -> unit
(* Shifting (<terminal>) to state <state> *)
val shift: terminal -> state -> unit
(* Reducing a production should be logged either as a reduction
event (for regular productions) or as an acceptance event (for
start productions). *)
(* Reducing production <production> / Accepting *)
val reduce_or_accept: production -> unit
(* Lookahead token is now <terminal> (<pos>-<pos>) *)
val lookahead_token: terminal -> Lexing.position -> Lexing.position -> unit
(* Initiating error handling *)
val initiating_error_handling: unit -> unit
(* Resuming error handling *)
val resuming_error_handling: unit -> unit
(* Handling error in state <state> *)
val handling_error: state -> unit
end
end
(* --------------------------------------------------------------------------- *)
(* This signature describes the monolithic (traditional) LR engine. *)
(* In this interface, the parser controls the lexer. *)
module type MONOLITHIC_ENGINE = sig
type state
type token
type semantic_value
(* An entry point to the engine requires a start state, a lexer, and a lexing
buffer. It either succeeds and produces a semantic value, or fails and
raises [Error]. *)
exception Error
val entry:
state ->
(Lexing.lexbuf -> token) ->
Lexing.lexbuf ->
semantic_value
end
(* --------------------------------------------------------------------------- *)
(* The following signatures describe the incremental LR engine. *)
(* First, see [INCREMENTAL_ENGINE] in the file [IncrementalEngine.ml]. *)
(* The [start] function is set apart because we do not wish to publish
it as part of the generated [parser.mli] file. Instead, the table
back-end will publish specialized versions of it, with a suitable
type cast. *)
module type INCREMENTAL_ENGINE_START = sig
(* [start] is an entry point. It requires a start state and a start position
and begins the parsing process. If the lexer is based on an OCaml lexing
buffer, the start position should be [lexbuf.lex_curr_p]. [start] produces
a checkpoint, which usually will be an [InputNeeded] checkpoint. (It could
be [Accepted] if this starting state accepts only the empty word. It could
be [Rejected] if this starting state accepts no word at all.) It does not
raise any exception. *)
(* [start s pos] should really produce a checkpoint of type ['a checkpoint],
for a fixed ['a] that depends on the state [s]. We cannot express this, so
we use [semantic_value checkpoint], which is safe. The table back-end uses
[Obj.magic] to produce safe specialized versions of [start]. *)
type state
type semantic_value
type 'a checkpoint
val start:
state ->
Lexing.position ->
semantic_value checkpoint
end
(* --------------------------------------------------------------------------- *)
(* This signature describes the LR engine, which combines the monolithic
and incremental interfaces. *)
module type ENGINE = sig
include MONOLITHIC_ENGINE
include IncrementalEngine.INCREMENTAL_ENGINE
with type token := token
and type 'a lr1state = state (* useful for us; hidden from the end user *)
include INCREMENTAL_ENGINE_START
with type state := state
and type semantic_value := semantic_value
and type 'a checkpoint := 'a checkpoint
end
end
module Engine : sig
(******************************************************************************)
(* *)
(* Menhir *)
(* *)
(* François Pottier, Inria Paris *)
(* Yann Régis-Gianas, PPS, Université Paris Diderot *)
(* *)
(* Copyright Inria. All rights reserved. This file is distributed under the *)
(* terms of the GNU Library General Public License version 2, with a *)
(* special exception on linking, as described in the file LICENSE. *)
(* *)
(******************************************************************************)
open EngineTypes
(* The LR parsing engine. *)
module Make (T : TABLE)
: ENGINE
with type state = T.state
and type token = T.token
and type semantic_value = T.semantic_value
and type production = T.production
and type 'a env = (T.state, T.semantic_value, T.token) EngineTypes.env
(* We would prefer not to expose the definition of the type [env].
However, it must be exposed because some of the code in the
inspection API needs access to the engine's internals; see
[InspectionTableInterpreter]. Everything would be simpler if
--inspection was always ON, but that would lead to bigger parse
tables for everybody. *)
end
module ErrorReports : sig
(******************************************************************************)
(* *)
(* Menhir *)
(* *)
(* François Pottier, Inria Paris *)
(* Yann Régis-Gianas, PPS, Université Paris Diderot *)
(* *)
(* Copyright Inria. All rights reserved. This file is distributed under the *)
(* terms of the GNU Library General Public License version 2, with a *)
(* special exception on linking, as described in the file LICENSE. *)
(* *)
(******************************************************************************)
(* -------------------------------------------------------------------------- *)
(* The following functions help keep track of the start and end positions of
the last two tokens in a two-place buffer. This is used to nicely display
where a syntax error took place. *)
type 'a buffer
(* [wrap lexer] returns a pair of a new (initially empty) buffer and a lexer
which internally relies on [lexer] and updates [buffer] on the fly whenever
a token is demanded. *)
open Lexing
val wrap:
(lexbuf -> 'token) ->
(position * position) buffer * (lexbuf -> 'token)
(* [show f buffer] prints the contents of the buffer, producing a string that
is typically of the form "after '%s' and before '%s'". The function [f] is
used to print an element. The buffer MUST be nonempty. *)
val show: ('a -> string) -> 'a buffer -> string
(* [last buffer] returns the last element of the buffer. The buffer MUST be
nonempty. *)
val last: 'a buffer -> 'a
(* -------------------------------------------------------------------------- *)
end
module Printers : sig
(******************************************************************************)
(* *)
(* Menhir *)
(* *)
(* François Pottier, Inria Paris *)
(* Yann Régis-Gianas, PPS, Université Paris Diderot *)
(* *)
(* Copyright Inria. All rights reserved. This file is distributed under the *)
(* terms of the GNU Library General Public License version 2, with a *)
(* special exception on linking, as described in the file LICENSE. *)
(* *)
(******************************************************************************)
(* This module is part of MenhirLib. *)
module Make
(I : IncrementalEngine.EVERYTHING)
(User : sig
(* [print s] is supposed to send the string [s] to some output channel. *)
val print: string -> unit
(* [print_symbol s] is supposed to print a representation of the symbol [s]. *)
val print_symbol: I.xsymbol -> unit
(* [print_element e] is supposed to print a representation of the element [e].
This function is optional; if it is not provided, [print_element_as_symbol]
(defined below) is used instead. *)
val print_element: (I.element -> unit) option
end)
: sig
open I
(* Printing a list of symbols. *)
val print_symbols: xsymbol list -> unit
(* Printing an element as a symbol. This prints just the symbol
that this element represents; nothing more. *)
val print_element_as_symbol: element -> unit
(* Printing a stack as a list of elements. This function needs an element
printer. It uses [print_element] if provided by the user; otherwise
it uses [print_element_as_symbol]. (Ending with a newline.) *)
val print_stack: 'a env -> unit
(* Printing an item. (Ending with a newline.) *)
val print_item: item -> unit
(* Printing a production. (Ending with a newline.) *)
val print_production: production -> unit
(* Printing the current LR(1) state. The current state is first displayed
as a number; then the list of its LR(0) items is printed. (Ending with
a newline.) *)
val print_current_state: 'a env -> unit
(* Printing a summary of the stack and current state. This function just
calls [print_stack] and [print_current_state] in succession. *)
val print_env: 'a env -> unit
end
end
module InfiniteArray : sig
(******************************************************************************)
(* *)
(* Menhir *)
(* *)
(* François Pottier, Inria Paris *)
(* Yann Régis-Gianas, PPS, Université Paris Diderot *)
(* *)
(* Copyright Inria. All rights reserved. This file is distributed under the *)
(* terms of the GNU Library General Public License version 2, with a *)
(* special exception on linking, as described in the file LICENSE. *)
(* *)
(******************************************************************************)
(** This module implements infinite arrays. **)
type 'a t
(** [make x] creates an infinite array, where every slot contains [x]. **)
val make: 'a -> 'a t
(** [get a i] returns the element contained at offset [i] in the array [a].
Slots are numbered 0 and up. **)
val get: 'a t -> int -> 'a
(** [set a i x] sets the element contained at offset [i] in the array
[a] to [x]. Slots are numbered 0 and up. **)
val set: 'a t -> int -> 'a -> unit
(** [extent a] is the length of an initial segment of the array [a]
that is sufficiently large to contain all [set] operations ever
performed. In other words, all elements beyond that segment have
the default value. *)
val extent: 'a t -> int
(** [domain a] is a fresh copy of an initial segment of the array [a]
whose length is [extent a]. *)
val domain: 'a t -> 'a array
end
module PackedIntArray : sig
(******************************************************************************)
(* *)
(* Menhir *)
(* *)
(* François Pottier, Inria Paris *)
(* Yann Régis-Gianas, PPS, Université Paris Diderot *)
(* *)
(* Copyright Inria. All rights reserved. This file is distributed under the *)
(* terms of the GNU Library General Public License version 2, with a *)
(* special exception on linking, as described in the file LICENSE. *)
(* *)
(******************************************************************************)
(* A packed integer array is represented as a pair of an integer [k] and
a string [s]. The integer [k] is the number of bits per integer that we
use. The string [s] is just an array of bits, which is read in 8-bit
chunks. *)
(* The ocaml programming language treats string literals and array literals
in slightly different ways: the former are statically allocated, while
the latter are dynamically allocated. (This is rather arbitrary.) In the
context of Menhir's table-based back-end, where compact, immutable
integer arrays are needed, ocaml strings are preferable to ocaml arrays. *)
type t =
int * string
(* [pack a] turns an array of integers into a packed integer array. *)
(* Because the sign bit is the most significant bit, the magnitude of
any negative number is the word size. In other words, [pack] does
not achieve any space savings as soon as [a] contains any negative
numbers, even if they are ``small''. *)
val pack: int array -> t
(* [get t i] returns the integer stored in the packed array [t] at index [i]. *)
(* Together, [pack] and [get] satisfy the following property: if the index [i]
is within bounds, then [get (pack a) i] equals [a.(i)]. *)
val get: t -> int -> int
(* [get1 t i] returns the integer stored in the packed array [t] at index [i].
It assumes (and does not check) that the array's bit width is [1]. The
parameter [t] is just a string. *)
val get1: string -> int -> int
(* [unflatten1 (n, data) i j] accesses the two-dimensional bitmap
represented by [(n, data)] at indices [i] and [j]. The integer
[n] is the width of the bitmap; the string [data] is the second
component of the packed array obtained by encoding the table as
a one-dimensional array. *)
val unflatten1: int * string -> int -> int -> int
end
module RowDisplacement : sig
(******************************************************************************)
(* *)
(* Menhir *)
(* *)
(* François Pottier, Inria Paris *)
(* Yann Régis-Gianas, PPS, Université Paris Diderot *)
(* *)
(* Copyright Inria. All rights reserved. This file is distributed under the *)
(* terms of the GNU Library General Public License version 2, with a *)
(* special exception on linking, as described in the file LICENSE. *)
(* *)
(******************************************************************************)
(* This module compresses a two-dimensional table, where some values
are considered insignificant, via row displacement. *)
(* A compressed table is represented as a pair of arrays. The
displacement array is an array of offsets into the data array. *)
type 'a table =
int array * (* displacement *)
'a array (* data *)
(* [compress equal insignificant dummy m n t] turns the two-dimensional table
[t] into a compressed table. The parameter [equal] is equality of data
values. The parameter [wildcard] tells which data values are insignificant,
and can thus be overwritten with other values. The parameter [dummy] is
used to fill holes in the data array. [m] and [n] are the integer
dimensions of the table [t]. *)
val compress:
('a -> 'a -> bool) ->
('a -> bool) ->
'a ->
int -> int ->
'a array array ->
'a table
(* [get ct i j] returns the value found at indices [i] and [j] in the
compressed table [ct]. This function call is permitted only if the
value found at indices [i] and [j] in the original table is
significant -- otherwise, it could fail abruptly. *)
(* Together, [compress] and [get] have the property that, if the value
found at indices [i] and [j] in an uncompressed table [t] is
significant, then [get (compress t) i j] is equal to that value. *)
val get:
'a table ->
int -> int ->
'a
(* [getget] is a variant of [get] which only requires read access,
via accessors, to the two components of the table. *)
val getget:
('displacement -> int -> int) ->
('data -> int -> 'a) ->
'displacement * 'data ->
int -> int ->
'a
end
module LinearizedArray : sig
(******************************************************************************)
(* *)
(* Menhir *)
(* *)
(* François Pottier, Inria Paris *)
(* Yann Régis-Gianas, PPS, Université Paris Diderot *)
(* *)
(* Copyright Inria. All rights reserved. This file is distributed under the *)
(* terms of the GNU Library General Public License version 2, with a *)
(* special exception on linking, as described in the file LICENSE. *)
(* *)
(******************************************************************************)
(* An array of arrays (of possibly different lengths!) can be ``linearized'',
i.e., encoded as a data array (by concatenating all of the little arrays)
and an entry array (which contains offsets into the data array). *)
type 'a t =
(* data: *) 'a array *
(* entry: *) int array
(* [make a] turns the array of arrays [a] into a linearized array. *)
val make: 'a array array -> 'a t
(* [read la i j] reads the linearized array [la] at indices [i] and [j].
Thus, [read (make a) i j] is equivalent to [a.(i).(j)]. *)
val read: 'a t -> int -> int -> 'a
(* [write la i j v] writes the value [v] into the linearized array [la]
at indices [i] and [j]. *)
val write: 'a t -> int -> int -> 'a -> unit
(* [length la] is the number of rows of the array [la]. Thus, [length (make
a)] is equivalent to [Array.length a]. *)
val length: 'a t -> int
(* [row_length la i] is the length of the row at index [i] in the linearized
array [la]. Thus, [row_length (make a) i] is equivalent to [Array.length
a.(i)]. *)
val row_length: 'a t -> int -> int
(* [read_row la i] reads the row at index [i], producing a list. Thus,
[read_row (make a) i] is equivalent to [Array.to_list a.(i)]. *)
val read_row: 'a t -> int -> 'a list
(* The following variants read the linearized array via accessors
[get_data : int -> 'a] and [get_entry : int -> int]. *)
val row_length_via:
(* get_entry: *) (int -> int) ->
(* i: *) int ->
int
val read_via:
(* get_data: *) (int -> 'a) ->
(* get_entry: *) (int -> int) ->
(* i: *) int ->
(* j: *) int ->
'a
val read_row_via:
(* get_data: *) (int -> 'a) ->
(* get_entry: *) (int -> int) ->
(* i: *) int ->
'a list
end
module TableFormat : sig
(******************************************************************************)
(* *)
(* Menhir *)
(* *)
(* François Pottier, Inria Paris *)
(* Yann Régis-Gianas, PPS, Université Paris Diderot *)
(* *)
(* Copyright Inria. All rights reserved. This file is distributed under the *)
(* terms of the GNU Library General Public License version 2, with a *)
(* special exception on linking, as described in the file LICENSE. *)
(* *)
(******************************************************************************)
(* This signature defines the format of the parse tables. It is used as
an argument to [TableInterpreter.Make]. *)
module type TABLES = sig
(* This is the parser's type of tokens. *)
type token
(* This maps a token to its internal (generation-time) integer code. *)
val token2terminal: token -> int
(* This is the integer code for the error pseudo-token. *)
val error_terminal: int
(* This maps a token to its semantic value. *)
val token2value: token -> Obj.t
(* Traditionally, an LR automaton is described by two tables, namely, an
action table and a goto table. See, for instance, the Dragon book.
The action table is a two-dimensional matrix that maps a state and a
lookahead token to an action. An action is one of: shift to a certain
state, reduce a certain production, accept, or fail.
The goto table is a two-dimensional matrix that maps a state and a
non-terminal symbol to either a state or undefined. By construction, this
table is sparse: its undefined entries are never looked up. A compression
technique is free to overlap them with other entries.
In Menhir, things are slightly different. If a state has a default
reduction on token [#], then that reduction must be performed without
consulting the lookahead token. As a result, we must first determine
whether that is the case, before we can obtain a lookahead token and use it
as an index in the action table.
Thus, Menhir's tables are as follows.
A one-dimensional default reduction table maps a state to either ``no
default reduction'' (encoded as: 0) or ``by default, reduce prod''
(encoded as: 1 + prod). The action table is looked up only when there
is no default reduction. *)
val default_reduction: PackedIntArray.t
(* Menhir follows Dencker, Dürre and Heuft, who point out that, although the
action table is not sparse by nature (i.e., the error entries are
significant), it can be made sparse by first factoring out a binary error
matrix, then replacing the error entries in the action table with undefined
entries. Thus:
A two-dimensional error bitmap maps a state and a terminal to either
``fail'' (encoded as: 0) or ``do not fail'' (encoded as: 1). The action
table, which is now sparse, is looked up only in the latter case. *)
(* The error bitmap is flattened into a one-dimensional table; its width is
recorded so as to allow indexing. The table is then compressed via
[PackedIntArray]. The bit width of the resulting packed array must be
[1], so it is not explicitly recorded. *)
(* The error bitmap does not contain a column for the [#] pseudo-terminal.
Thus, its width is [Terminal.n - 1]. We exploit the fact that the integer
code assigned to [#] is greatest: the fact that the right-most column
in the bitmap is missing does not affect the code for accessing it. *)
val error: int (* width of the bitmap *) * string (* second component of [PackedIntArray.t] *)
(* A two-dimensional action table maps a state and a terminal to one of
``shift to state s and discard the current token'' (encoded as: s | 10),
``shift to state s without discarding the current token'' (encoded as: s |
11), or ``reduce prod'' (encoded as: prod | 01). *)
(* The action table is first compressed via [RowDisplacement], then packed
via [PackedIntArray]. *)
(* Like the error bitmap, the action table does not contain a column for the
[#] pseudo-terminal. *)
val action: PackedIntArray.t * PackedIntArray.t
(* A one-dimensional lhs table maps a production to its left-hand side (a
non-terminal symbol). *)
val lhs: PackedIntArray.t
(* A two-dimensional goto table maps a state and a non-terminal symbol to
either undefined (encoded as: 0) or a new state s (encoded as: 1 + s). *)
(* The goto table is first compressed via [RowDisplacement], then packed
via [PackedIntArray]. *)
val goto: PackedIntArray.t * PackedIntArray.t
(* The number of start productions. A production [prod] is a start
production if and only if [prod < start] holds. This is also the
number of start symbols. A nonterminal symbol [nt] is a start
symbol if and only if [nt < start] holds. *)
val start: int
(* A one-dimensional semantic action table maps productions to semantic
actions. The calling convention for semantic actions is described in
[EngineTypes]. This table contains ONLY NON-START PRODUCTIONS, so the
indexing is off by [start]. Be careful. *)
val semantic_action: ((int, Obj.t, token) EngineTypes.env ->
(int, Obj.t) EngineTypes.stack) array
(* The parser defines its own [Error] exception. This exception can be
raised by semantic actions and caught by the engine, and raised by the
engine towards the final user. *)
exception Error
(* The parser indicates whether to generate a trace. Generating a
trace requires two extra tables, which respectively map a
terminal symbol and a production to a string. *)
val trace: (string array * string array) option
end
end
module InspectionTableFormat : sig
(******************************************************************************)
(* *)
(* Menhir *)
(* *)
(* François Pottier, Inria Paris *)
(* Yann Régis-Gianas, PPS, Université Paris Diderot *)
(* *)
(* Copyright Inria. All rights reserved. This file is distributed under the *)
(* terms of the GNU Library General Public License version 2, with a *)
(* special exception on linking, as described in the file LICENSE. *)
(* *)
(******************************************************************************)
(* This signature defines the format of the tables that are produced (in
addition to the tables described in [TableFormat]) when the command line
switch [--inspection] is enabled. It is used as an argument to
[InspectionTableInterpreter.Make]. *)
module type TABLES = sig
(* The types of symbols. *)
include IncrementalEngine.SYMBOLS
(* The type ['a lr1state] describes an LR(1) state. The generated parser defines
it internally as [int]. *)
type 'a lr1state
(* Some of the tables that follow use encodings of (terminal and
nonterminal) symbols as integers. So, we need functions that
map the integer encoding of a symbol to its algebraic encoding. *)
val terminal: int -> xsymbol
val nonterminal: int -> xsymbol
(* The left-hand side of every production already appears in the
signature [TableFormat.TABLES], so we need not repeat it here. *)
(* The right-hand side of every production. This a linearized array
of arrays of integers, whose [data] and [entry] components have
been packed. The encoding of symbols as integers in described in
[TableBackend]. *)
val rhs: PackedIntArray.t * PackedIntArray.t
(* A mapping of every (non-initial) state to its LR(0) core. *)
val lr0_core: PackedIntArray.t
(* A mapping of every LR(0) state to its set of LR(0) items. Each item is
represented in its packed form (see [Item]) as an integer. Thus the
mapping is an array of arrays of integers, which is linearized and
packed, like [rhs]. *)
val lr0_items: PackedIntArray.t * PackedIntArray.t
(* A mapping of every LR(0) state to its incoming symbol, if it has one. *)
val lr0_incoming: PackedIntArray.t
(* A table that tells which non-terminal symbols are nullable. *)
val nullable: string
(* This is a packed int array of bit width 1. It can be read
using [PackedIntArray.get1]. *)
(* A two-table dimensional table, indexed by a nonterminal symbol and
by a terminal symbol (other than [#]), encodes the FIRST sets. *)
val first: int (* width of the bitmap *) * string (* second component of [PackedIntArray.t] *)
end
end
module InspectionTableInterpreter : sig
(******************************************************************************)
(* *)
(* Menhir *)
(* *)
(* François Pottier, Inria Paris *)
(* Yann Régis-Gianas, PPS, Université Paris Diderot *)
(* *)
(* Copyright Inria. All rights reserved. This file is distributed under the *)
(* terms of the GNU Library General Public License version 2, with a *)
(* special exception on linking, as described in the file LICENSE. *)
(* *)
(******************************************************************************)
(* This functor is invoked inside the generated parser, in [--table] mode. It
produces no code! It simply constructs the types [symbol] and [xsymbol] on
top of the generated types [terminal] and [nonterminal]. *)
module Symbols (T : sig
type 'a terminal
type 'a nonterminal
end)
: IncrementalEngine.SYMBOLS
with type 'a terminal := 'a T.terminal
and type 'a nonterminal := 'a T.nonterminal
(* This functor is invoked inside the generated parser, in [--table] mode. It
constructs the inspection API on top of the inspection tables described in
[InspectionTableFormat]. *)
module Make
(TT : TableFormat.TABLES)
(IT : InspectionTableFormat.TABLES
with type 'a lr1state = int)
(ET : EngineTypes.TABLE
with type terminal = int
and type nonterminal = int
and type semantic_value = Obj.t)
(E : sig
type 'a env = (ET.state, ET.semantic_value, ET.token) EngineTypes.env
end)
: IncrementalEngine.INSPECTION
with type 'a terminal := 'a IT.terminal
and type 'a nonterminal := 'a IT.nonterminal
and type 'a lr1state := 'a IT.lr1state
and type production := int
and type 'a env := 'a E.env
end
module TableInterpreter : sig
(******************************************************************************)
(* *)
(* Menhir *)
(* *)
(* François Pottier, Inria Paris *)
(* Yann Régis-Gianas, PPS, Université Paris Diderot *)
(* *)
(* Copyright Inria. All rights reserved. This file is distributed under the *)
(* terms of the GNU Library General Public License version 2, with a *)
(* special exception on linking, as described in the file LICENSE. *)
(* *)
(******************************************************************************)
(* This module provides a thin decoding layer for the generated tables, thus
providing an API that is suitable for use by [Engine.Make]. It is part of
[MenhirLib]. *)
(* The exception [Error] is declared within the generated parser. This is
preferable to pre-declaring it here, as it ensures that each parser gets
its own, distinct [Error] exception. This is consistent with the code-based
back-end. *)
(* This functor is invoked by the generated parser. *)
module MakeEngineTable
(T : TableFormat.TABLES)
: EngineTypes.TABLE
with type state = int
and type token = T.token
and type semantic_value = Obj.t
and type production = int
and type terminal = int
and type nonterminal = int
end
module StaticVersion : sig
val require_20171222 : unit
end
|