parse.c

一个小型嵌入式数据库SQLite的源码,C语言

/* Driver template for the LEMON parser generator.
** The author disclaims copyright to this source code.
*/
/* First off, code is include which follows the "include" declaration
** in the input file. */
#include <stdio.h>
#line 56 "parse.y"

#include "sqliteInt.h"
#include "parse.h"

/*
** An instance of this structure holds information about the
** LIMIT clause of a SELECT statement.
*/
struct LimitVal {
  Expr *pLimit;    /* The LIMIT expression.  NULL if there is no limit */
  Expr *pOffset;   /* The OFFSET expression.  NULL if there is none */
};

/*
** An instance of this structure is used to store the LIKE,
** GLOB, NOT LIKE, and NOT GLOB operators.
*/
struct LikeOp {
  Token eOperator;  /* "like" or "glob" or "regexp" */
  int not;         /* True if the NOT keyword is present */
};

/*
** 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; };

/*
** An instance of this structure holds the ATTACH key and the key type.
*/
struct AttachKey { int type;  Token key; };

#line 48 "parse.c"
/* Next is all token values, in a form suitable for use by makeheaders.
** This section will be null unless lemon is run with the -m switch.
*/
/* 
** These constants (all generated automatically by the parser generator)
** specify the various kinds of tokens (terminals) that the parser
** understands. 
**
** Each symbol here is a terminal symbol in the grammar.
*/
/* Make sure the INTERFACE macro is defined.
*/
#ifndef INTERFACE
# define INTERFACE 1
#endif
/* The next thing included is series of defines which control
** various aspects of the generated parser.
**    YYCODETYPE         is the data type used for storing terminal
**                       and nonterminal numbers.  "unsigned char" is
**                       used if there are fewer than 250 terminals
**                       and nonterminals.  "int" is used otherwise.
**    YYNOCODE           is a number of type YYCODETYPE which corresponds
**                       to no legal terminal or nonterminal number.  This
**                       number is used to fill in empty slots of the hash 
**                       table.
**    YYFALLBACK         If defined, this indicates that one or more tokens
**                       have fall-back values which should be used if the
**                       original value of the token will not parse.
**    YYACTIONTYPE       is the data type used for storing terminal
**                       and nonterminal numbers.  "unsigned char" is
**                       used if there are fewer than 250 rules and
**                       states combined.  "int" is used otherwise.
**    sqlite3ParserTOKENTYPE     is the data type used for minor tokens given 
**                       directly to the parser from the tokenizer.
**    YYMINORTYPE        is the data type used for all minor tokens.
**                       This is typically a union of many types, one of
**                       which is sqlite3ParserTOKENTYPE.  The entry in the union
**                       for base tokens is called "yy0".
**    YYSTACKDEPTH       is the maximum depth of the parser's stack.
**    sqlite3ParserARG_SDECL     A static variable declaration for the %extra_argument
**    sqlite3ParserARG_PDECL     A parameter declaration for the %extra_argument
**    sqlite3ParserARG_STORE     Code to store %extra_argument into yypParser
**    sqlite3ParserARG_FETCH     Code to extract %extra_argument from yypParser
**    YYNSTATE           the combined number of states.
**    YYNRULE            the number of rules in the grammar
**    YYERRORSYMBOL      is the code number of the error symbol.  If not
**                       defined, then do no error processing.
*/
#define YYCODETYPE unsigned char
#define YYNOCODE 248
#define YYACTIONTYPE unsigned short int
#define YYWILDCARD 60
#define sqlite3ParserTOKENTYPE Token
typedef union {
  sqlite3ParserTOKENTYPE yy0;
  int yy46;
  struct LikeOp yy72;
  Expr* yy172;
  ExprList* yy174;
  Select* yy219;
  struct LimitVal yy234;
  TriggerStep* yy243;
  struct TrigEvent yy370;
  SrcList* yy373;
  Expr * yy386;
  struct {int value; int mask;} yy405;
  Token yy410;
  IdList* yy432;
  int yy495;
} YYMINORTYPE;
#define YYSTACKDEPTH 100
#define sqlite3ParserARG_SDECL Parse *pParse;
#define sqlite3ParserARG_PDECL ,Parse *pParse
#define sqlite3ParserARG_FETCH Parse *pParse = yypParser->pParse
#define sqlite3ParserARG_STORE yypParser->pParse = pParse
#define YYNSTATE 586
#define YYNRULE 310
#define YYERRORSYMBOL 139
#define YYERRSYMDT yy495
#define YYFALLBACK 1
#define YY_NO_ACTION      (YYNSTATE+YYNRULE+2)
#define YY_ACCEPT_ACTION  (YYNSTATE+YYNRULE+1)
#define YY_ERROR_ACTION   (YYNSTATE+YYNRULE)

/* Next are that tables used to determine what action to take based on the
** current state and lookahead token.  These tables are used to implement
** functions that take a state number and lookahead value and return an
** action integer.  
**
** Suppose the action integer is N.  Then the action is determined as
** follows
**
**   0 <= N < YYNSTATE                  Shift N.  That is, push the lookahead
**                                      token onto the stack and goto state N.
**
**   YYNSTATE <= N < YYNSTATE+YYNRULE   Reduce by rule N-YYNSTATE.
**
**   N == YYNSTATE+YYNRULE              A syntax error has occurred.
**
**   N == YYNSTATE+YYNRULE+1            The parser accepts its input.
**
**   N == YYNSTATE+YYNRULE+2            No such action.  Denotes unused
**                                      slots in the yy_action[] table.
**
** The action table is constructed as a single large table named yy_action[].
** Given state S and lookahead X, the action is computed as
**
**      yy_action[ yy_shift_ofst[S] + X ]
**
** If the index value yy_shift_ofst[S]+X is out of range or if the value
** yy_lookahead[yy_shift_ofst[S]+X] is not equal to X or if yy_shift_ofst[S]
** is equal to YY_SHIFT_USE_DFLT, it means that the action is not in the table
** and that yy_default[S] should be used instead.  
**
** The formula above is for computing the action when the lookahead is
** a terminal symbol.  If the lookahead is a non-terminal (as occurs after
** a reduce action) then the yy_reduce_ofst[] array is used in place of
** the yy_shift_ofst[] array and YY_REDUCE_USE_DFLT is used in place of
** YY_SHIFT_USE_DFLT.
**
** The following are the tables generated in this section:
**
**  yy_action[]        A single table containing all actions.
**  yy_lookahead[]     A table containing the lookahead for each entry in
**                     yy_action.  Used to detect hash collisions.
**  yy_shift_ofst[]    For each state, the offset into yy_action for
**                     shifting terminals.
**  yy_reduce_ofst[]   For each state, the offset into yy_action for
**                     shifting non-terminals after a reduce.
**  yy_default[]       Default action for each state.
*/
static const YYACTIONTYPE yy_action[] = {
 /*     0 */   290,   67,  294,   69,  150,  168,  206,  435,   61,   61,
 /*    10 */    61,   61,   66,   63,   63,   63,   63,   64,   64,   65,
 /*    20 */    65,   65,   66,  445,  325,  164,  448,  454,   68,   63,
 /*    30 */    63,   63,   63,   64,   64,   65,   65,   65,   66,   64,
 /*    40 */    64,   65,   65,   65,   66,   60,   58,  298,  458,  459,
 /*    50 */   455,  455,   62,   62,   61,   61,   61,   61,  517,   63,
 /*    60 */    63,   63,   63,   64,   64,   65,   65,   65,   66,  290,
 /*    70 */   321,   67,  435,   69,  150,   79,  160,  114,  224,  317,
 /*    80 */   229,  318,  172,  249,  897,  120,  585,  519,  522,    2,
 /*    90 */   250,  571,  426,   35,  223,  448,  454,  532,   20,   57,
 /*   100 */   388,  385,   63,   63,   63,   63,   64,   64,   65,   65,
 /*   110 */    65,   66,  290,  477,   60,   58,  298,  458,  459,  455,
 /*   120 */   455,   62,   62,   61,   61,   61,   61,  393,   63,   63,
 /*   130 */    63,   63,   64,   64,   65,   65,   65,   66,  448,  454,
 /*   140 */    91,  314,  389,  484,  236,  387,  271,  204,    2,   83,
 /*   150 */   586,  388,  385,  474,  196,  443,  209,   60,   58,  298,
 /*   160 */   458,  459,  455,  455,   62,   62,   61,   61,   61,   61,
 /*   170 */   170,   63,   63,   63,   63,   64,   64,   65,   65,   65,
 /*   180 */    66,  290,  490,  443,  209,  274,  109,  272,  427,  447,
 /*   190 */   406,  284,  394,  395,  445,  521,  164,  321,  511,   67,
 /*   200 */   530,   69,  150,  567,  427,  143,  520,  448,  454,  145,
 /*   210 */   146,  583,  888,  376,  888,  515,  171,  156,  518,  426,
 /*   220 */    40,  340,  430,   19,  290,  140,   60,   58,  298,  458,
 /*   230 */   459,  455,  455,   62,   62,   61,   61,   61,   61,  384,
 /*   240 */    63,   63,   63,   63,   64,   64,   65,   65,   65,   66,
 /*   250 */   448,  454,  580,  408,  409,  432,  432,  432,  332,  335,
 /*   260 */   240,  549,   67,  472,   69,  150,  273,  290,  294,   60,
 /*   270 */    58,  298,  458,  459,  455,  455,   62,   62,   61,   61,
 /*   280 */    61,   61,  124,   63,   63,   63,   63,   64,   64,   65,
 /*   290 */    65,   65,   66,  448,  454,  405,  514,  393,  293,  548,
 /*   300 */    65,   65,   65,   66,  511,  393,  546,  409,  447,  297,
 /*   310 */   438,  439,   60,   58,  298,  458,  459,  455,  455,   62,
 /*   320 */    62,   61,   61,   61,   61,  206,   63,   63,   63,   63,
 /*   330 */    64,   64,   65,   65,   65,   66,  523,  518,  369,  290,
 /*   340 */    75,  430,  148,  494,  224,  317,  229,  318,  172,  249,
 /*   350 */   370,  267,  266,    1,  579,  289,  250,  393,  420,  449,
 /*   360 */   450,  206,  394,  395,  177,  448,  454,  343,  346,  347,
 /*   370 */   394,  395,  208,  360,  432,  432,  432,  363,  168,  348,
 /*   380 */   435,  452,  453,   78,   60,   58,  298,  458,  459,  455,
 /*   390 */   455,   62,   62,   61,   61,   61,   61,  480,   63,   63,
 /*   400 */    63,   63,   64,   64,   65,   65,   65,   66,  290,  451,
 /*   410 */   177,  566,  497,  343,  346,  347,   21,  321,  522,  321,
 /*   420 */   435,  321,  394,  395,  321,  348,  479,  404,   20,  568,
 /*   430 */   569,  493,  151,  177,  448,  454,  343,  346,  347,  426,
 /*   440 */    34,  426,   34,  426,   34,  435,  426,   34,  348,  197,
 /*   450 */   237,  147,  531,   60,   58,  298,  458,  459,  455,  455,
 /*   460 */    62,   62,   61,   61,   61,   61,  427,   63,   63,   63,
 /*   470 */    63,   64,   64,   65,   65,   65,   66,  290,  230,  351,
 /*   480 */   412,  516,  301,  427,  337,  435,  321,  155,  321,  299,
 /*   490 */   321,  208,  413,  154,  469,    9,  469,  462,  468,  393,
 /*   500 */    74,  469,   76,  448,  454,  414,  173,  410,  426,   40,
 /*   510 */   426,   48,  426,   48,  324,  438,  439,  411,  327,  479,
 /*   520 */   461,  461,   60,   58,  298,  458,  459,  455,  455,   62,
 /*   530 */    62,   61,   61,   61,   61,  463,   63,   63,   63,   63,
 /*   540 */    64,   64,   65,   65,   65,   66,  290,  321,  503,  238,
 /*   550 */   253,  484,  393,  341,  412,  149,  425,  309,  338,  310,
 /*   560 */   424,  393,  292,  393,  394,  395,  413,  250,  504,  426,
 /*   570 */    27,  241,  448,  454,  435,  426,    3,  208,  543,  414,
 /*   580 */   322,  331,  583,  887,  327,  887,  461,  461,  488,  427,
 /*   590 */   242,   60,   58,  298,  458,  459,  455,  455,   62,   62,
 /*   600 */    61,   61,   61,   61,  255,   63,   63,   63,   63,   64,
 /*   610 */    64,   65,   65,   65,   66,  290,  371,  394,  395,  492,
 /*   620 */    90,  302,  327,  580,  461,  461,  394,  395,  394,  395,
 /*   630 */   321,  529,  498,  321,  396,  397,  398,  522,  528,  435,
 /*   640 */   219,  448,  454,  259,  481,  257,  576,   20,  327,  300,
 /*   650 */   461,  461,  426,   28,  545,  426,   23,  509,  290,  342,
 /*   660 */    60,   58,  298,  458,  459,  455,  455,   62,   62,   61,
 /*   670 */    61,   61,   61,  321,   63,   63,   63,   63,   64,   64,
 /*   680 */    65,   65,   65,   66,  448,  454,  425,  539,  357,  539,
 /*   690 */   424,  261,  303,  509,  822,  426,   32,  436,  509,   22,
 /*   700 */   188,  290,  509,   60,   58,  298,  458,  459,  455,  455,
 /*   710 */    62,   62,   61,   61,   61,   61,  321,   63,   63,   63,
 /*   720 */    63,   64,   64,   65,   65,   65,   66,  448,  454,  174,
 /*   730 */   175,  176,  381,  216,  427,  484,  248,  304,  426,   53,
 /*   740 */   509,  509,  261,  261,  290,  261,   60,   70,  298,  458,
 /*   750 */   459,  455,  455,   62,   62,   61,   61,   61,   61,  368,
 /*   760 */    63,   63,   63,   63,   64,   64,   65,   65,   65,   66,
 /*   770 */   448,  454,  247,  392,  244,  305,  307,  248,  167,  156,
 /*   780 */   364,  248,  383,  262,  556,  261,  558,  290,  261,  115,
 /*   790 */    58,  298,  458,  459,  455,  455,   62,   62,   61,   61,
 /*   800 */    61,   61,  321,   63,   63,   63,   63,   64,   64,   65,
 /*   810 */    65,   65,   66,  448,  454,  488,  467,  488,   12,  248,
 /*   820 */   248,  207,    5,  367,  426,   24,  559,  367,   54,  560,
 /*   830 */   312,  119,  441,  441,  298,  458,  459,  455,  455,   62,
 /*   840 */    62,   61,   61,   61,   61,  321,   63,   63,   63,   63,
 /*   850 */    64,   64,   65,   65,   65,   66,   71,  328,  321,    4,
 /*   860 */   321,  541,  321,  296,  261,  540,  261,  426,   51,  321,
 /*   870 */   161,  323,   71,  328,  321,    4,  358,  359,  308,  296,
 /*   880 */   426,   96,  426,   93,  426,   98,  225,  323,  330,  217,
 /*   890 */   431,  426,   99,  218,  444,  321,  426,  110,  226,  447,
 /*   900 */   321,  261,  321,  421,  330,  275,  190,  375,  321,  333,
 /*   910 */   422,  321,  417,  418,  470,  447,  321,  426,  111,   73,
 /*   920 */    72,  192,  426,   16,  426,   97,  152,   71,  319,  320,
 /*   930 */   426,   33,  430,  426,   94,   73,   72,  491,  426,   52,
 /*   940 */   321,  478,  277,   71,  319,  320,   71,  328,  430,    4,