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GeezerVison is showing github.com — sqlite/src/parse.y at version-3.35.5 · sqlite/sqlite Expand file tree/ Copy pathparse.yMore file actions 1872 lines (1692 loc) · 64.5 KB / Copy pathparse.yFile metadata and controls1872 lines (1692 loc) · 64.5 KB 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 %include { /* ** 2001-09-15 ** ** The author disclaims copyright to this source code. In place of ** a legal notice, here is a blessing: ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This file contains SQLite's SQL parser. ** ** The canonical source code to this file ("parse.y") is a Lemon grammar ** file that specifies the input grammar and actions to take while parsing. ** That input file is processed by Lemon to generate a C-language ** implementation of a parser for the given grammer. You might be reading ** this comment as part of the translated C-code. Edits should be made ** to the original parse.y sources. */ } // All token codes are small integers with #defines that begin with "TK_" %token_prefix TK_ // The type of the data attached to each token is Token. This is also the // default type for non-terminals. // %token_type {Token} %default_type {Token} // An extra argument to the constructor for the parser, which is available // to all actions. %extra_context {Parse *pParse} // This code runs whenever there is a syntax error // %syntax_error { UNUSED_PARAMETER(yymajor); /* Silence some compiler warnings */ if( TOKEN.z[0] ){ sqlite3ErrorMsg(pParse, "near \"%T\": syntax error", &TOKEN); }else{ sqlite3ErrorMsg(pParse, "incomplete input"); } } %stack_overflow { sqlite3ErrorMsg(pParse, "parser stack overflow"); } // The name of the generated procedure that implements the parser // is as follows: %name sqlite3Parser // The following text is included near the beginning of the C source // code file that implements the parser. // %include { #include "sqliteInt.h" /* ** Disable all error recovery processing in the parser push-down ** automaton. */ #define YYNOERRORRECOVERY 1 /* ** Make yytestcase() the same as testcase() */ #define yytestcase(X) testcase(X) /* ** Indicate that sqlite3ParserFree() will never be called with a null ** pointer. */ #define YYPARSEFREENEVERNULL 1 /* ** In the amalgamation, the parse.c file generated by lemon and the ** tokenize.c file are concatenated. In that case, sqlite3RunParser() ** has access to the the size of the yyParser object and so the parser ** engine can be allocated from stack. In that case, only the ** sqlite3ParserInit() and sqlite3ParserFinalize() routines are invoked ** and the sqlite3ParserAlloc() and sqlite3ParserFree() routines can be ** omitted. */ #ifdef SQLITE_AMALGAMATION # define sqlite3Parser_ENGINEALWAYSONSTACK 1 #endif /* ** Alternative datatype for the argument to the malloc() routine passed ** into sqlite3ParserAlloc(). The default is size_t. */ #define YYMALLOCARGTYPE u64 /* ** An instance of the following structure describes the event of a ** TRIGGER. "a" is the event type, one of TK_UPDATE, TK_INSERT, ** TK_DELETE, or TK_INSTEAD. If the event is of the form ** ** UPDATE ON (a,b,c) ** ** Then the "b" IdList records the list "a,b,c". */ struct TrigEvent { int a; IdList * b; }; struct FrameBound { int eType; Expr *pExpr; }; /* ** Disable lookaside memory allocation for objects that might be ** shared across database connections. */ static void disableLookaside(Parse *pParse){ sqlite3 *db = pParse->db; pParse->disableLookaside++; DisableLookaside; } #if !defined(SQLITE_ENABLE_UPDATE_DELETE_LIMIT) \ && defined(SQLITE_UDL_CAPABLE_PARSER) /* ** Issue an error message if an ORDER BY or LIMIT clause occurs on an ** UPDATE or DELETE statement. */ static void updateDeleteLimitError( Parse *pParse, ExprList *pOrderBy, Expr *pLimit ){ if( pOrderBy ){ sqlite3ErrorMsg(pParse, "syntax error near \"ORDER BY\""); }else{ sqlite3ErrorMsg(pParse, "syntax error near \"LIMIT\""); } sqlite3ExprListDelete(pParse->db, pOrderBy); sqlite3ExprDelete(pParse->db, pLimit); } #endif /* SQLITE_ENABLE_UPDATE_DELETE_LIMIT */ } // end %include // Input is a single SQL command input ::= cmdlist. cmdlist ::= cmdlist ecmd. cmdlist ::= ecmd. ecmd ::= SEMI. ecmd ::= cmdx SEMI. %ifndef SQLITE_OMIT_EXPLAIN ecmd ::= explain cmdx SEMI. {NEVER-REDUCE} explain ::= EXPLAIN. { pParse->explain = 1; } explain ::= EXPLAIN QUERY PLAN. { pParse->explain = 2; } %endif SQLITE_OMIT_EXPLAIN cmdx ::= cmd. { sqlite3FinishCoding(pParse); } ///////////////////// Begin and end transactions. //////////////////////////// // cmd ::= BEGIN transtype(Y) trans_opt. {sqlite3BeginTransaction(pParse, Y);} trans_opt ::= . trans_opt ::= TRANSACTION. trans_opt ::= TRANSACTION nm. %type transtype {int} transtype(A) ::= . {A = TK_DEFERRED;} transtype(A) ::= DEFERRED(X). {A = @X; /*A-overwrites-X*/} transtype(A) ::= IMMEDIATE(X). {A = @X; /*A-overwrites-X*/} transtype(A) ::= EXCLUSIVE(X). {A = @X; /*A-overwrites-X*/} cmd ::= COMMIT|END(X) trans_opt. {sqlite3EndTransaction(pParse,@X);} cmd ::= ROLLBACK(X) trans_opt. {sqlite3EndTransaction(pParse,@X);} savepoint_opt ::= SAVEPOINT. savepoint_opt ::= . cmd ::= SAVEPOINT nm(X). { sqlite3Savepoint(pParse, SAVEPOINT_BEGIN, &X); } cmd ::= RELEASE savepoint_opt nm(X). { sqlite3Savepoint(pParse, SAVEPOINT_RELEASE, &X); } cmd ::= ROLLBACK trans_opt TO savepoint_opt nm(X). { sqlite3Savepoint(pParse, SAVEPOINT_ROLLBACK, &X); } ///////////////////// The CREATE TABLE statement //////////////////////////// // cmd ::= create_table create_table_args. create_table ::= createkw temp(T) TABLE ifnotexists(E) nm(Y) dbnm(Z). { sqlite3StartTable(pParse,&Y,&Z,T,0,0,E); } createkw(A) ::= CREATE(A). {disableLookaside(pParse);} %type ifnotexists {int} ifnotexists(A) ::= . {A = 0;} ifnotexists(A) ::= IF NOT EXISTS. {A = 1;} %type temp {int} %ifndef SQLITE_OMIT_TEMPDB temp(A) ::= TEMP. {A = 1;} %endif SQLITE_OMIT_TEMPDB temp(A) ::= . {A = 0;} create_table_args ::= LP columnlist conslist_opt(X) RP(E) table_options(F). { sqlite3EndTable(pParse,&X,&E,F,0); } create_table_args ::= AS select(S). { sqlite3EndTable(pParse,0,0,0,S); sqlite3SelectDelete(pParse->db, S); } %type table_options {int} table_options(A) ::= . {A = 0;} table_options(A) ::= WITHOUT nm(X). { if( X.n==5 && sqlite3_strnicmp(X.z,"rowid",5)==0 ){ A = TF_WithoutRowid | TF_NoVisibleRowid; }else{ A = 0; sqlite3ErrorMsg(pParse, "unknown table option: %.*s", X.n, X.z); } } columnlist ::= columnlist COMMA columnname carglist. columnlist ::= columnname carglist. columnname(A) ::= nm(A) typetoken(Y). {sqlite3AddColumn(pParse,&A,&Y);} // Declare some tokens early in order to influence their values, to // improve performance and reduce the executable size. The goal here is // to get the "jump" operations in ISNULL through ESCAPE to have numeric // values that are early enough so that all jump operations are clustered // at the beginning. // %token ABORT ACTION AFTER ANALYZE ASC ATTACH BEFORE BEGIN BY CASCADE CAST. %token CONFLICT DATABASE DEFERRED DESC DETACH EACH END EXCLUSIVE EXPLAIN FAIL. %token OR AND NOT IS MATCH LIKE_KW BETWEEN IN ISNULL NOTNULL NE EQ. %token GT LE LT GE ESCAPE. // The following directive causes tokens ABORT, AFTER, ASC, etc. to // fallback to ID if they will not parse as their original value. // This obviates the need for the "id" nonterminal. // %fallback ID ABORT ACTION AFTER ANALYZE ASC ATTACH BEFORE BEGIN BY CASCADE CAST COLUMNKW CONFLICT DATABASE DEFERRED DESC DETACH DO EACH END EXCLUSIVE EXPLAIN FAIL FOR IGNORE IMMEDIATE INITIALLY INSTEAD LIKE_KW MATCH NO PLAN QUERY KEY OF OFFSET PRAGMA RAISE RECURSIVE RELEASE REPLACE RESTRICT ROW ROWS ROLLBACK SAVEPOINT TEMP TRIGGER VACUUM VIEW VIRTUAL WITH WITHOUT NULLS FIRST LAST %ifdef SQLITE_OMIT_COMPOUND_SELECT EXCEPT INTERSECT UNION %endif SQLITE_OMIT_COMPOUND_SELECT %ifndef SQLITE_OMIT_WINDOWFUNC CURRENT FOLLOWING PARTITION PRECEDING RANGE UNBOUNDED EXCLUDE GROUPS OTHERS TIES %endif SQLITE_OMIT_WINDOWFUNC %ifndef SQLITE_OMIT_GENERATED_COLUMNS GENERATED ALWAYS %endif MATERIALIZED REINDEX RENAME CTIME_KW IF . %wildcard ANY. // Define operator precedence early so that this is the first occurrence // of the operator tokens in the grammer. Keeping the operators together // causes them to be assigned integer values that are close together, // which keeps parser tables smaller. // // The token values assigned to these symbols is determined by the order // in which lemon first sees them. It must be the case that ISNULL/NOTNULL, // NE/EQ, GT/LE, and GE/LT are separated by only a single value. See // the sqlite3ExprIfFalse() routine for additional information on this // constraint. // %left OR. %left AND. %right NOT. %left IS MATCH LIKE_KW BETWEEN IN ISNULL NOTNULL NE EQ. %left GT LE LT GE. %right ESCAPE. %left BITAND BITOR LSHIFT RSHIFT. %left PLUS MINUS. %left STAR SLASH REM. %left CONCAT. %left COLLATE. %right BITNOT. %nonassoc ON. // An IDENTIFIER can be a generic identifier, or one of several // keywords. Any non-standard keyword can also be an identifier. // %token_class id ID|INDEXED. // And "ids" is an identifer-or-string. // %token_class ids ID|STRING. // The name of a column or table can be any of the following: // %type nm {Token} nm(A) ::= id(A). nm(A) ::= STRING(A). nm(A) ::= JOIN_KW(A). // A typetoken is really zero or more tokens that form a type name such // as can be found after the column name in a CREATE TABLE statement. // Multiple tokens are concatenated to form the value of the typetoken. // %type typetoken {Token} typetoken(A) ::= . {A.n = 0; A.z = 0;} typetoken(A) ::= typename(A). typetoken(A) ::= typename(A) LP signed RP(Y). { A.n = (int)(&Y.z[Y.n] - A.z); } typetoken(A) ::= typename(A) LP signed COMMA signed RP(Y). { A.n = (int)(&Y.z[Y.n] - A.z); } %type typename {Token} typename(A) ::= ids(A). typename(A) ::= typename(A) ids(Y). {A.n=Y.n+(int)(Y.z-A.z);} signed ::= plus_num. signed ::= minus_num. // The scanpt non-terminal takes a value which is a pointer to the // input text just past the last token that has been shifted into // the parser. By surrounding some phrase in the grammar with two // scanpt non-terminals, we can capture the input text for that phrase. // For example: // // something ::= .... scanpt(A) phrase scanpt(Z). // // The text that is parsed as "phrase" is a string starting at A // and containing (int)(Z-A) characters. There might be some extra // whitespace on either end of the text, but that can be removed in // post-processing, if needed. // %type scanpt {const char*} scanpt(A) ::= . { assert( yyLookahead!=YYNOCODE ); A = yyLookaheadToken.z; } scantok(A) ::= . { assert( yyLookahead!=YYNOCODE ); A = yyLookaheadToken; } // "carglist" is a list of additional constraints that come after the // column name and column type in a CREATE TABLE statement. // carglist ::= carglist ccons. carglist ::= . ccons ::= CONSTRAINT nm(X). {pParse->constraintName = X;} ccons ::= DEFAULT scantok(A) term(X). {sqlite3AddDefaultValue(pParse,X,A.z,&A.z[A.n]);} ccons ::= DEFAULT LP(A) expr(X) RP(Z). {sqlite3AddDefaultValue(pParse,X,A.z+1,Z.z);} ccons ::= DEFAULT PLUS(A) scantok(Z) term(X). {sqlite3AddDefaultValue(pParse,X,A.z,&Z.z[Z.n]);} ccons ::= DEFAULT MINUS(A) scantok(Z) term(X). { Expr *p = sqlite3PExpr(pParse, TK_UMINUS, X, 0); sqlite3AddDefaultValue(pParse,p,A.z,&Z.z[Z.n]); } ccons ::= DEFAULT scantok id(X). { Expr *p = tokenExpr(pParse, TK_STRING, X); if( p ){ sqlite3ExprIdToTrueFalse(p); testcase( p->op==TK_TRUEFALSE && sqlite3ExprTruthValue(p) ); } sqlite3AddDefaultValue(pParse,p,X.z,X.z+X.n); } // In addition to the type name, we also care about the primary key and // UNIQUE constraints. // ccons ::= NULL onconf. ccons ::= NOT NULL onconf(R). {sqlite3AddNotNull(pParse, R);} ccons ::= PRIMARY KEY sortorder(Z) onconf(R) autoinc(I). {sqlite3AddPrimaryKey(pParse,0,R,I,Z);} ccons ::= UNIQUE onconf(R). {sqlite3CreateIndex(pParse,0,0,0,0,R,0,0,0,0, SQLITE_IDXTYPE_UNIQUE);} ccons ::= CHECK LP(A) expr(X) RP(B). {sqlite3AddCheckConstraint(pParse,X,A.z,B.z);} ccons ::= REFERENCES nm(T) eidlist_opt(TA) refargs(R). {sqlite3CreateForeignKey(pParse,0,&T,TA,R);} ccons ::= defer_subclause(D). {sqlite3DeferForeignKey(pParse,D);} ccons ::= COLLATE ids(C). {sqlite3AddCollateType(pParse, &C);} ccons ::= GENERATED ALWAYS AS generated. ccons ::= AS generated. generated ::= LP expr(E) RP. {sqlite3AddGenerated(pParse,E,0);} generated ::= LP expr(E) RP ID(TYPE). {sqlite3AddGenerated(pParse,E,&TYPE);} // The optional AUTOINCREMENT keyword %type autoinc {int} autoinc(X) ::= . {X = 0;} autoinc(X) ::= AUTOINCR. {X = 1;} // The next group of rules parses the arguments to a REFERENCES clause // that determine if the referential integrity checking is deferred or // or immediate and which determine what action to take if a ref-integ // check fails. // %type refargs {int} refargs(A) ::= . { A = OE_None*0x0101; /* EV: R-19803-45884 */} refargs(A) ::= refargs(A) refarg(Y). { A = (A & ~Y.mask) | Y.value; } %type refarg {struct {int value; int mask;}} refarg(A) ::= MATCH nm. { A.value = 0; A.mask = 0x000000; } refarg(A) ::= ON INSERT refact. { A.value = 0; A.mask = 0x000000; } refarg(A) ::= ON DELETE refact(X). { A.value = X; A.mask = 0x0000ff; } refarg(A) ::= ON UPDATE refact(X). { A.value = X<<8; A.mask = 0x00ff00; } %type refact {int} refact(A) ::= SET NULL. { A = OE_SetNull; /* EV: R-33326-45252 */} refact(A) ::= SET DEFAULT. { A = OE_SetDflt; /* EV: R-33326-45252 */} refact(A) ::= CASCADE. { A = OE_Cascade; /* EV: R-33326-45252 */} refact(A) ::= RESTRICT. { A = OE_Restrict; /* EV: R-33326-45252 */} refact(A) ::= NO ACTION. { A = OE_None; /* EV: R-33326-45252 */} %type defer_subclause {int} defer_subclause(A) ::= NOT DEFERRABLE init_deferred_pred_opt. {A = 0;} defer_subclause(A) ::= DEFERRABLE init_deferred_pred_opt(X). {A = X;} %type init_deferred_pred_opt {int} init_deferred_pred_opt(A) ::= . {A = 0;} init_deferred_pred_opt(A) ::= INITIALLY DEFERRED. {A = 1;} init_deferred_pred_opt(A) ::= INITIALLY IMMEDIATE. {A = 0;} conslist_opt(A) ::= . {A.n = 0; A.z = 0;} conslist_opt(A) ::= COMMA(A) conslist. conslist ::= conslist tconscomma tcons. conslist ::= tcons. tconscomma ::= COMMA. {pParse->constraintName.n = 0;} tconscomma ::= . tcons ::= CONSTRAINT nm(X). {pParse->constraintName = X;} tcons ::= PRIMARY KEY LP sortlist(X) autoinc(I) RP onconf(R). {sqlite3AddPrimaryKey(pParse,X,R,I,0);} tcons ::= UNIQUE LP sortlist(X) RP onconf(R). {sqlite3CreateIndex(pParse,0,0,0,X,R,0,0,0,0, SQLITE_IDXTYPE_UNIQUE);} tcons ::= CHECK LP(A) expr(E) RP(B) onconf. {sqlite3AddCheckConstraint(pParse,E,A.z,B.z);} tcons ::= FOREIGN KEY LP eidlist(FA) RP REFERENCES nm(T) eidlist_opt(TA) refargs(R) defer_subclause_opt(D). { sqlite3CreateForeignKey(pParse, FA, &T, TA, R); sqlite3DeferForeignKey(pParse, D); } %type defer_subclause_opt {int} defer_subclause_opt(A) ::= . {A = 0;} defer_subclause_opt(A) ::= defer_subclause(A). // The following is a non-standard extension that allows us to declare the // default behavior when there is a constraint conflict. // %type onconf {int} %type orconf {int} %type resolvetype {int} onconf(A) ::= . {A = OE_Default;} onconf(A) ::= ON CONFLICT resolvetype(X). {A = X;} orconf(A) ::= . {A = OE_Default;} orconf(A) ::= OR resolvetype(X). {A = X;} resolvetype(A) ::= raisetype(A). resolvetype(A) ::= IGNORE. {A = OE_Ignore;} resolvetype(A) ::= REPLACE. {A = OE_Replace;} ////////////////////////// The DROP TABLE ///////////////////////////////////// // cmd ::= DROP TABLE ifexists(E) fullname(X). { sqlite3DropTable(pParse, X, 0, E); } %type ifexists {int} ifexists(A) ::= IF EXISTS. {A = 1;} ifexists(A) ::= . {A = 0;} ///////////////////// The CREATE VIEW statement ///////////////////////////// // %ifndef SQLITE_OMIT_VIEW cmd ::= createkw(X) temp(T) VIEW ifnotexists(E) nm(Y) dbnm(Z) eidlist_opt(C) AS select(S). { sqlite3CreateView(pParse, &X, &Y, &Z, C, S, T, E); } cmd ::= DROP VIEW ifexists(E) fullname(X). { sqlite3DropTable(pParse, X, 1, E); } %endif SQLITE_OMIT_VIEW //////////////////////// The SELECT statement ///////////////////////////////// // cmd ::= select(X). { SelectDest dest = {SRT_Output, 0, 0, 0, 0, 0, 0}; sqlite3Select(pParse, X, &dest); sqlite3SelectDelete(pParse->db, X); } %type select {Select*} %destructor select {sqlite3SelectDelete(pParse->db, $$);} %type selectnowith {Select*} %destructor selectnowith {sqlite3SelectDelete(pParse->db, $$);} %type oneselect {Select*} %destructor oneselect {sqlite3SelectDelete(pParse->db, $$);} %include { /* ** For a compound SELECT statement, make sure p->pPrior->pNext==p for ** all elements in the list. And make sure list length does not exceed ** SQLITE_LIMIT_COMPOUND_SELECT. */ static void parserDoubleLinkSelect(Parse *pParse, Select *p){ assert( p!=0 ); if( p->pPrior ){ Select *pNext = 0, *pLoop = p; int mxSelect, cnt = 1; while(1){ pLoop->pNext = pNext; pLoop->selFlags |= SF_Compound; pNext = pLoop; pLoop = pLoop->pPrior; if( pLoop==0 ) break; cnt++; if( pLoop->pOrderBy || pLoop->pLimit ){ sqlite3ErrorMsg(pParse,"%s clause should come after %s not before", pLoop->pOrderBy!=0 ? "ORDER BY" : "LIMIT", sqlite3SelectOpName(pNext->op)); break; } } if( (p->selFlags & SF_MultiValue)==0 && (mxSelect = pParse->db->aLimit[SQLITE_LIMIT_COMPOUND_SELECT])>0 && cnt>mxSelect ){ sqlite3ErrorMsg(pParse, "too many terms in compound SELECT"); } } } /* Attach a With object describing the WITH clause to a Select ** object describing the query for which the WITH clause is a prefix. */ static Select *attachWithToSelect(Parse *pParse, Select *pSelect, With *pWith){ if( pSelect ){ pSelect->pWith = pWith; parserDoubleLinkSelect(pParse, pSelect); }else{ sqlite3WithDelete(pParse->db, pWith); } return pSelect; } } %ifndef SQLITE_OMIT_CTE select(A) ::= WITH wqlist(W) selectnowith(X). {A = attachWithToSelect(pParse,X,W);} select(A) ::= WITH RECURSIVE wqlist(W) selectnowith(X). {A = attachWithToSelect(pParse,X,W);} %endif /* SQLITE_OMIT_CTE */ select(A) ::= selectnowith(X). { Select *p = X; if( p ){ parserDoubleLinkSelect(pParse, p); } A = p; /*A-overwrites-X*/ } selectnowith(A) ::= oneselect(A). %ifndef SQLITE_OMIT_COMPOUND_SELECT selectnowith(A) ::= selectnowith(A) multiselect_op(Y) oneselect(Z). { Select *pRhs = Z; Select *pLhs = A; if( pRhs && pRhs->pPrior ){ SrcList *pFrom; Token x; x.n = 0; parserDoubleLinkSelect(pParse, pRhs); pFrom = sqlite3SrcListAppendFromTerm(pParse,0,0,0,&x,pRhs,0,0); pRhs = sqlite3SelectNew(pParse,0,pFrom,0,0,0,0,0,0); } if( pRhs ){ pRhs->op = (u8)Y; pRhs->pPrior = pLhs; if( ALWAYS(pLhs) ) pLhs->selFlags &= ~SF_MultiValue; pRhs->selFlags &= ~SF_MultiValue; if( Y!=TK_ALL ) pParse->hasCompound = 1; }else{ sqlite3SelectDelete(pParse->db, pLhs); } A = pRhs; } %type multiselect_op {int} multiselect_op(A) ::= UNION(OP). {A = @OP; /*A-overwrites-OP*/} multiselect_op(A) ::= UNION ALL. {A = TK_ALL;} multiselect_op(A) ::= EXCEPT|INTERSECT(OP). {A = @OP; /*A-overwrites-OP*/} %endif SQLITE_OMIT_COMPOUND_SELECT oneselect(A) ::= SELECT distinct(D) selcollist(W) from(X) where_opt(Y) groupby_opt(P) having_opt(Q) orderby_opt(Z) limit_opt(L). { A = sqlite3SelectNew(pParse,W,X,Y,P,Q,Z,D,L); } %ifndef SQLITE_OMIT_WINDOWFUNC oneselect(A) ::= SELECT distinct(D) selcollist(W) from(X) where_opt(Y) groupby_opt(P) having_opt(Q) window_clause(R) orderby_opt(Z) limit_opt(L). { A = sqlite3SelectNew(pParse,W,X,Y,P,Q,Z,D,L); if( A ){ A->pWinDefn = R; }else{ sqlite3WindowListDelete(pParse->db, R); } } %endif oneselect(A) ::= values(A). %type values {Select*} %destructor values {sqlite3SelectDelete(pParse->db, $$);} values(A) ::= VALUES LP nexprlist(X) RP. { A = sqlite3SelectNew(pParse,X,0,0,0,0,0,SF_Values,0); } values(A) ::= values(A) COMMA LP nexprlist(Y) RP. { Select *pRight, *pLeft = A; pRight = sqlite3SelectNew(pParse,Y,0,0,0,0,0,SF_Values|SF_MultiValue,0); if( ALWAYS(pLeft) ) pLeft->selFlags &= ~SF_MultiValue; if( pRight ){ pRight->op = TK_ALL; pRight->pPrior = pLeft; A = pRight; }else{ A = pLeft; } } // The "distinct" nonterminal is true (1) if the DISTINCT keyword is // present and false (0) if it is not. // %type distinct {int} distinct(A) ::= DISTINCT. {A = SF_Distinct;} distinct(A) ::= ALL. {A = SF_All;} distinct(A) ::= . {A = 0;} // selcollist is a list of expressions that are to become the return // values of the SELECT statement. The "*" in statements like // "SELECT * FROM ..." is encoded as a special expression with an // opcode of TK_ASTERISK. // %type selcollist {ExprList*} %destructor selcollist {sqlite3ExprListDelete(pParse->db, $$);} %type sclp {ExprList*} %destructor sclp {sqlite3ExprListDelete(pParse->db, $$);} sclp(A) ::= selcollist(A) COMMA. sclp(A) ::= . {A = 0;} selcollist(A) ::= sclp(A) scanpt(B) expr(X) scanpt(Z) as(Y). { A = sqlite3ExprListAppend(pParse, A, X); if( Y.n>0 ) sqlite3ExprListSetName(pParse, A, &Y, 1); sqlite3ExprListSetSpan(pParse,A,B,Z); } selcollist(A) ::= sclp(A) scanpt STAR. { Expr *p = sqlite3Expr(pParse->db, TK_ASTERISK, 0); A = sqlite3ExprListAppend(pParse, A, p); } selcollist(A) ::= sclp(A) scanpt nm(X) DOT STAR. { Expr *pRight = sqlite3PExpr(pParse, TK_ASTERISK, 0, 0); Expr *pLeft = sqlite3ExprAlloc(pParse->db, TK_ID, &X, 1); Expr *pDot = sqlite3PExpr(pParse, TK_DOT, pLeft, pRight); A = sqlite3ExprListAppend(pParse,A, pDot); } // An option "AS <id>" phrase that can follow one of the expressions that // define the result set, or one of the tables in the FROM clause. // %type as {Token} as(X) ::= AS nm(Y). {X = Y;} as(X) ::= ids(X). as(X) ::= . {X.n = 0; X.z = 0;} %type seltablist {SrcList*} %destructor seltablist {sqlite3SrcListDelete(pParse->db, $$);} %type stl_prefix {SrcList*} %destructor stl_prefix {sqlite3SrcListDelete(pParse->db, $$);} %type from {SrcList*} %destructor from {sqlite3SrcListDelete(pParse->db, $$);} // A complete FROM clause. // from(A) ::= . {A = 0;} from(A) ::= FROM seltablist(X). { A = X; sqlite3SrcListShiftJoinType(A); } // "seltablist" is a "Select Table List" - the content of the FROM clause // in a SELECT statement. "stl_prefix" is a prefix of this list. // stl_prefix(A) ::= seltablist(A) joinop(Y). { if( ALWAYS(A && A->nSrc>0) ) A->a[A->nSrc-1].fg.jointype = (u8)Y; } stl_prefix(A) ::= . {A = 0;} seltablist(A) ::= stl_prefix(A) nm(Y) dbnm(D) as(Z) indexed_opt(I) on_opt(N) using_opt(U). { A = sqlite3SrcListAppendFromTerm(pParse,A,&Y,&D,&Z,0,N,U); sqlite3SrcListIndexedBy(pParse, A, &I); } seltablist(A) ::= stl_prefix(A) nm(Y) dbnm(D) LP exprlist(E) RP as(Z) on_opt(N) using_opt(U). { A = sqlite3SrcListAppendFromTerm(pParse,A,&Y,&D,&Z,0,N,U); sqlite3SrcListFuncArgs(pParse, A, E); } %ifndef SQLITE_OMIT_SUBQUERY seltablist(A) ::= stl_prefix(A) LP select(S) RP as(Z) on_opt(N) using_opt(U). { A = sqlite3SrcListAppendFromTerm(pParse,A,0,0,&Z,S,N,U); } seltablist(A) ::= stl_prefix(A) LP seltablist(F) RP as(Z) on_opt(N) using_opt(U). { if( A==0 && Z.n==0 && N==0 && U==0 ){ A = F; }else if( F->nSrc==1 ){ A = sqlite3SrcListAppendFromTerm(pParse,A,0,0,&Z,0,N,U); if( A ){ SrcItem *pNew = &A->a[A->nSrc-1]; SrcItem *pOld = F->a; pNew->zName = pOld->zName; pNew->zDatabase = pOld->zDatabase; pNew->pSelect = pOld->pSelect; if( pOld->fg.isTabFunc ){ pNew->u1.pFuncArg = pOld->u1.pFuncArg; pOld->u1.pFuncArg = 0; pOld->fg.isTabFunc = 0; pNew->fg.isTabFunc = 1; } pOld->zName = pOld->zDatabase = 0; pOld->pSelect = 0; } sqlite3SrcListDelete(pParse->db, F); }else{ Select *pSubquery; sqlite3SrcListShiftJoinType(F); pSubquery = sqlite3SelectNew(pParse,0,F,0,0,0,0,SF_NestedFrom,0); A = sqlite3SrcListAppendFromTerm(pParse,A,0,0,&Z,pSubquery,N,U); } } %endif SQLITE_OMIT_SUBQUERY %type dbnm {Token} dbnm(A) ::= . {A.z=0; A.n=0;} dbnm(A) ::= DOT nm(X). {A = X;} %type fullname {SrcList*} %destructor fullname {sqlite3SrcListDelete(pParse->db, $$);} fullname(A) ::= nm(X). { A = sqlite3SrcListAppend(pParse,0,&X,0); if( IN_RENAME_OBJECT && A ) sqlite3RenameTokenMap(pParse, A->a[0].zName, &X); } fullname(A) ::= nm(X) DOT nm(Y). { A = sqlite3SrcListAppend(pParse,0,&X,&Y); if( IN_RENAME_OBJECT && A ) sqlite3RenameTokenMap(pParse, A->a[0].zName, &Y); } %type xfullname {SrcList*} %destructor xfullname {sqlite3SrcListDelete(pParse->db, $$);} xfullname(A) ::= nm(X). {A = sqlite3SrcListAppend(pParse,0,&X,0); /*A-overwrites-X*/} xfullname(A) ::= nm(X) DOT nm(Y). {A = sqlite3SrcListAppend(pParse,0,&X,&Y); /*A-overwrites-X*/} xfullname(A) ::= nm(X) DOT nm(Y) AS nm(Z). { A = sqlite3SrcListAppend(pParse,0,&X,&Y); /*A-overwrites-X*/ if( A ) A->a[0].zAlias = sqlite3NameFromToken(pParse->db, &Z); } xfullname(A) ::= nm(X) AS nm(Z). { A = sqlite3SrcListAppend(pParse,0,&X,0); /*A-overwrites-X*/ if( A ) A->a[0].zAlias = sqlite3NameFromToken(pParse->db, &Z); } %type joinop {int} joinop(X) ::= COMMA|JOIN. { X = JT_INNER; } joinop(X) ::= JOIN_KW(A) JOIN. {X = sqlite3JoinType(pParse,&A,0,0); /*X-overwrites-A*/} joinop(X) ::= JOIN_KW(A) nm(B) JOIN. {X = sqlite3JoinType(pParse,&A,&B,0); /*X-overwrites-A*/} joinop(X) ::= JOIN_KW(A) nm(B) nm(C) JOIN. {X = sqlite3JoinType(pParse,&A,&B,&C);/*X-overwrites-A*/} // There is a parsing abiguity in an upsert statement that uses a // SELECT on the RHS of a the INSERT: // // INSERT INTO tab SELECT * FROM aaa JOIN bbb ON CONFLICT ... // here ----^^ // // When the ON token is encountered, the parser does not know if it is // the beginning of an ON CONFLICT clause, or the beginning of an ON // clause associated with the JOIN. The conflict is resolved in favor // of the JOIN. If an ON CONFLICT clause is intended, insert a dummy // WHERE clause in between, like this: // // INSERT INTO tab SELECT * FROM aaa JOIN bbb WHERE true ON CONFLICT ... // // The [AND] and [OR] precedence marks in the rules for on_opt cause the // ON in this context to always be interpreted as belonging to the JOIN. // %type on_opt {Expr*} %destructor on_opt {sqlite3ExprDelete(pParse->db, $$);} on_opt(N) ::= ON expr(E). {N = E;} on_opt(N) ::= . [OR] {N = 0;} // Note that this block abuses the Token type just a little. If there is // no "INDEXED BY" clause, the returned token is empty (z==0 && n==0). If // there is an INDEXED BY clause, then the token is populated as per normal, // with z pointing to the token data and n containing the number of bytes // in the token. // // If there is a "NOT INDEXED" clause, then (z==0 && n==1), which is // normally illegal. The sqlite3SrcListIndexedBy() function // recognizes and interprets this as a special case. // %type indexed_opt {Token} indexed_opt(A) ::= . {A.z=0; A.n=0;} indexed_opt(A) ::= INDEXED BY nm(X). {A = X;} indexed_opt(A) ::= NOT INDEXED. {A.z=0; A.n=1;} %type using_opt {IdList*} %destructor using_opt {sqlite3IdListDelete(pParse->db, $$);} using_opt(U) ::= USING LP idlist(L) RP. {U = L;} using_opt(U) ::= . {U = 0;} %type orderby_opt {ExprList*} %destructor orderby_opt {sqlite3ExprListDelete(pParse->db, $$);} // the sortlist non-terminal stores a list of expression where each // expression is optionally followed by ASC or DESC to indicate the // sort order. // %type sortlist {ExprList*} %destructor sortlist {sqlite3ExprListDelete(pParse->db, $$);} orderby_opt(A) ::= . {A = 0;} orderby_opt(A) ::= ORDER BY sortlist(X). {A = X;} sortlist(A) ::= sortlist(A) COMMA expr(Y) sortorder(Z) nulls(X). { A = sqlite3ExprListAppend(pParse,A,Y); sqlite3ExprListSetSortOrder(A,Z,X); } sortlist(A) ::= expr(Y) sortorder(Z) nulls(X). { A = sqlite3ExprListAppend(pParse,0,Y); /*A-overwrites-Y*/ sqlite3ExprListSetSortOrder(A,Z,X); } %type sortorder {int} sortorder(A) ::= ASC. {A = SQLITE_SO_ASC;} sortorder(A) ::= DESC. {A = SQLITE_SO_DESC;} sortorder(A) ::= . {A = SQLITE_SO_UNDEFINED;} %type nulls {int} nulls(A) ::= NULLS FIRST. {A = SQLITE_SO_ASC;} nulls(A) ::= NULLS LAST. {A = SQLITE_SO_DESC;} nulls(A) ::= . {A = SQLITE_SO_UNDEFINED;} %type groupby_opt {ExprList*} %destructor groupby_opt {sqlite3ExprListDelete(pParse->db, $$);} groupby_opt(A) ::= . {A = 0;} groupby_opt(A) ::= GROUP BY nexprlist(X). {A = X;} %type having_opt {Expr*} %destructor having_opt {sqlite3ExprDelete(pParse->db, $$);} having_opt(A) ::= . {A = 0;} having_opt(A) ::= HAVING expr(X). {A = X;} %type limit_opt {Expr*} // The destructor for limit_opt will never fire in the current grammar. // The limit_opt non-terminal only occurs at the end of a single production // rule for SELECT statements. As soon as the rule that create the // limit_opt non-terminal reduces, the SELECT statement rule will also // reduce. So there is never a limit_opt non-terminal on the stack // except as a transient. So there is never anything to destroy. // //%destructor limit_opt {sqlite3ExprDelete(pParse->db, $$);} limit_opt(A) ::= . {A = 0;} limit_opt(A) ::= LIMIT expr(X). {A = sqlite3PExpr(pParse,TK_LIMIT,X,0);} limit_opt(A) ::= LIMIT expr(X) OFFSET expr(Y). {A = sqlite3PExpr(pParse,TK_LIMIT,X,Y);} limit_opt(A) ::= LIMIT expr(X) COMMA expr(Y). {A = sqlite3PExpr(pParse,TK_LIMIT,Y,X);} /////////////////////////// The DELETE statement ///////////////////////////// // %if SQLITE_ENABLE_UPDATE_DELETE_LIMIT || SQLITE_UDL_CAPABLE_PARSER cmd ::= with DELETE FROM xfullname(X) indexed_opt(I) where_opt_ret(W) orderby_opt(O) limit_opt(L). { sqlite3SrcListIndexedBy(pParse, X, &I); #ifndef SQLITE_ENABLE_UPDATE_DELETE_LIMIT if( O || L ){ updateDeleteLimitError(pParse,O,L); O = 0; L = 0; } #endif sqlite3DeleteFrom(pParse,X,W,O,L); } %else cmd ::= with DELETE FROM xfullname(X) indexed_opt(I) where_opt_ret(W). { sqlite3SrcListIndexedBy(pParse, X, &I); sqlite3DeleteFrom(pParse,X,W,0,0); } %endif %type where_opt {Expr*} %destructor where_opt {sqlite3ExprDelete(pParse->db, $$);} %type where_opt_ret {Expr*} %destructor where_opt_ret {sqlite3ExprDelete(pParse->db, $$);} where_opt(A) ::= . {A = 0;} where_opt(A) ::= WHERE expr(X). {A = X;} where_opt_ret(A) ::= . {A = 0;} where_opt_ret(A) ::= WHERE expr(X). {A = X;} where_opt_ret(A) ::= RETURNING selcollist(X). {sqlite3AddReturning(pParse,X); A = 0;} where_opt_ret(A) ::= WHERE expr(X) RETURNING selcollist(Y). {sqlite3AddReturning(pParse,Y); A = X;} ////////////////////////// The UPDATE command //////////////////////////////// // %if SQLITE_ENABLE_UPDATE_DELETE_LIMIT || SQLITE_UDL_CAPABLE_PARSER cmd ::= with UPDATE orconf(R) xfullname(X) indexed_opt(I) SET setlist(Y) from(F) where_opt_ret(W) orderby_opt(O) limit_opt(L). { sqlite3SrcListIndexedBy(pParse, X, &I); X = sqlite3SrcListAppendList(pParse, X, F); sqlite3ExprListCheckLength(pParse,Y,"set list"); #ifndef SQLITE_ENABLE_UPDATE_DELETE_LIMIT if( O || L ){ updateDeleteLimitError(pParse,O,L); O = 0; L = 0; } #endif sqlite3Update(pParse,X,Y,W,R,O,L,0); } %else cmd ::= with UPDATE orconf(R) xfullname(X) indexed_opt(I) SET setlist(Y) from(F) where_opt_ret(W). { sqlite3SrcListIndexedBy(pParse, X, &I); sqlite3ExprListCheckLength(pParse,Y,"set list"); X = sqlite3SrcListAppendList(pParse, X, F); sqlite3Update(pParse,X,Y,W,R,0,0,0); } %endif %type setlist {ExprList*} %destructor setlist {sqlite3ExprListDelete(pParse->db, $$);} setlist(A) ::= setlist(A) COMMA nm(X) EQ expr(Y). { A = sqlite3ExprListAppend(pParse, A, Y); sqlite3ExprListSetName(pParse, A, &X, 1); } setlist(A) ::= setlist(A) COMMA LP idlist(X) RP EQ expr(Y). { A = sqlite3ExprListAppendVector(pParse, A, X, Y); } setlist(A) ::= nm(X) EQ expr(Y). { A = sqlite3ExprListAppend(pParse, 0, Y); sqlite3ExprListSetName(pParse, A, &X, 1); } setlist(A) ::= LP idlist(X) RP EQ expr(Y). { A = sqlite3ExprListAppendVector(pParse, 0, X, Y); } ////////////////////////// The INSERT command ///////////////////////////////// // cmd ::= with insert_cmd(R) INTO xfullname(X) idlist_opt(F) select(S) upsert(U). { sqlite3Insert(pParse, X, S, F, R, U); } cmd ::= with insert_cmd(R) INTO xfullname(X) idlist_opt(F) DEFAULT VALUES returning. { sqlite3Insert(pParse, X, 0, F, R, 0); } %type upsert {Upsert*} // Because upsert only occurs at the tip end of the INSERT rule for cmd, // there is never a case where the value of the upsert pointer will not // be destroyed by the cmd action. So comment-out the destructor to // avoid unreachable code. //%destructor upsert {sqlite3UpsertDelete(pParse->db,$$);} upsert(A) ::= . { A = 0; } upsert(A) ::= RETURNING selcollist(X). { A = 0; sqlite3AddReturning(pParse,X); } upsert(A) ::= ON CONFLICT LP sortlist(T) RP where_opt(TW) DO UPDATE SET setlist(Z) where_opt(W) upsert(N). { A = sqlite3UpsertNew(pParse->db,T,TW,Z,W,N);} upsert(A) ::= ON CONFLICT LP sortlist(T) RP where_opt(TW) DO NOTHING upsert(N). { A = sqlite3UpsertNew(pParse->db,T,TW,0,0,N); } upsert(A) ::= ON CONFLICT DO NOTHING returning. { A = sqlite3UpsertNew(pParse->db,0,0,0,0,0); } upsert(A) ::= ON CONFLICT DO UPDATE SET setlist(Z) where_opt(W) returning. { A = sqlite3UpsertNew(pParse->db,0,0,Z,W,0);} returning ::= RETURNING selcollist(X). {sqlite3AddReturning(pParse,X);} returning ::= . %type insert_cmd {int} insert_cmd(A) ::= INSERT orconf(R). {A = R;} insert_cmd(A) ::= REPLACE. {A = OE_Replace;} %type idlist_opt {IdList*} %destructor idlist_opt {sqlite3IdListDelete(pParse->db, $$);} %type idlist {IdList*} %destructor idlist {sqlite3IdListDelete(pParse->db, $$);} idlist_opt(A) ::= . {A = 0;} |
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