SQLite

**
*************************************************************************
** This file contains SQLite's grammar for SQL.  Process this file
** using the lemon parser generator to generate C code that runs
** the parser.  Lemon will also generate a header file containing
** numeric codes for all of the tokens.
**
** @(#) $Id: parse.y,v 1.216 2007/03/27 14:44:51 drh Exp $
*/

// 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.

// fallback to ID if they will not parse as their original value.
// This obviates the need for the "id" nonterminal.
//
%fallback ID
  ABORT AFTER ANALYZE ASC ATTACH BEFORE BEGIN CASCADE CAST CONFLICT
  DATABASE DEFERRED DESC DETACH EACH END EXCLUSIVE EXPLAIN FAIL FOR
  IGNORE IMMEDIATE INITIALLY INSTEAD LIKE_KW MATCH PLAN QUERY KEY
  OF OFFSET PRAGMA RAISE REPLACE RESTRICT ROW STATEMENT
  TEMP TRIGGER VACUUM VIEW VIRTUAL
%ifdef SQLITE_OMIT_COMPOUND_SELECT
  EXCEPT INTERSECT UNION
%endif SQLITE_OMIT_COMPOUND_SELECT
  REINDEX RENAME CTIME_KW IF
  .
%wildcard ANY.

typetoken(A) ::= typename(X) LP signed COMMA signed RP(Y). {
  A.z = X.z;
  A.n = &Y.z[Y.n] - X.z;
}
%type typename {Token}
typename(A) ::= ids(X).             {A = X;}
typename(A) ::= typename(X) ids(Y). {A.z=X.z; A.n=Y.n+(Y.z-X.z);}
%type signed {int}
signed(A) ::= plus_num(X).    { A = atoi((char*)X.z); }
signed(A) ::= minus_num(X).   { A = -atoi((char*)X.z); }

// "carglist" is a list of additional constraints that come after the
// column name and column type in a CREATE TABLE statement.
//
carglist ::= carglist carg.
carglist ::= .
carg ::= CONSTRAINT nm ccons.

  all.z = A.z;
  all.n = (Z.z - A.z) + Z.n;
  sqlite3FinishTrigger(pParse, S, &all);
}

trigger_decl(A) ::= temp(T) TRIGGER ifnotexists(NOERR) nm(B) dbnm(Z) 
                    trigger_time(C) trigger_event(D)
                    ON fullname(E) foreach_clause(F) when_clause(G). {
  sqlite3BeginTrigger(pParse, &B, &Z, C, D.a, D.b, E, F, G, T, NOERR);
  A = (Z.n==0?B:Z);
}

%type trigger_time  {int}
trigger_time(A) ::= BEFORE.      { A = TK_BEFORE; }
trigger_time(A) ::= AFTER.       { A = TK_AFTER;  }
trigger_time(A) ::= INSTEAD OF.  { A = TK_INSTEAD;}
trigger_time(A) ::= .            { A = TK_BEFORE; }

%type trigger_event {struct TrigEvent}
%destructor trigger_event {sqlite3IdListDelete($$.b);}
trigger_event(A) ::= DELETE|INSERT(OP).       {A.a = @OP; A.b = 0;}
trigger_event(A) ::= UPDATE(OP).              {A.a = @OP; A.b = 0;}
trigger_event(A) ::= UPDATE OF inscollist(X). {A.a = TK_UPDATE; A.b = X;}

%type foreach_clause {int}
foreach_clause(A) ::= .                   { A = TK_ROW; }
foreach_clause(A) ::= FOR EACH ROW.       { A = TK_ROW; }
foreach_clause(A) ::= FOR EACH STATEMENT. { A = TK_STATEMENT; }

%type when_clause {Expr*}
%destructor when_clause {sqlite3ExprDelete($$);}
when_clause(A) ::= .             { A = 0; }
when_clause(A) ::= WHEN expr(X). { A = X; }

%type trigger_cmd_list {TriggerStep*}

/*
** 2001 September 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.
**
*************************************************************************
** Internal interface definitions for SQLite.
**
** @(#) $Id: sqliteInt.h,v 1.549 2007/04/05 11:25:59 drh Exp $
*/
#ifndef _SQLITEINT_H_
#define _SQLITEINT_H_

#if defined(SQLITE_TCL) || defined(TCLSH)
# include <tcl.h>
#endif

  char *name;             /* The name of the trigger                        */
  char *table;            /* The table or view to which the trigger applies */
  u8 op;                  /* One of TK_DELETE, TK_UPDATE, TK_INSERT         */
  u8 tr_tm;               /* One of TRIGGER_BEFORE, TRIGGER_AFTER */
  Expr *pWhen;            /* The WHEN clause of the expresion (may be NULL) */
  IdList *pColumns;       /* If this is an UPDATE OF <column-list> trigger,
                             the <column-list> is stored here */
  int foreach;            /* One of TK_ROW or TK_STATEMENT */
  Token nameToken;        /* Token containing zName. Use during parsing only */
  Schema *pSchema;        /* Schema containing the trigger */
  Schema *pTabSchema;     /* Schema containing the table */
  TriggerStep *step_list; /* Link list of trigger program steps             */
  Trigger *pNext;         /* Next trigger associated with the table */
};

int sqlite3SafetyOn(sqlite3*);
int sqlite3SafetyOff(sqlite3*);
int sqlite3SafetyCheck(sqlite3*);
void sqlite3ChangeCookie(sqlite3*, Vdbe*, int);

#ifndef SQLITE_OMIT_TRIGGER
  void sqlite3BeginTrigger(Parse*, Token*,Token*,int,int,IdList*,SrcList*,
                           int,Expr*,int, int);
  void sqlite3FinishTrigger(Parse*, TriggerStep*, Token*);
  void sqlite3DropTrigger(Parse*, SrcList*, int);
  void sqlite3DropTriggerPtr(Parse*, Trigger*);
  int sqlite3TriggersExist(Parse*, Table*, int, ExprList*);
  int sqlite3CodeRowTrigger(Parse*, int, ExprList*, int, Table *, int, int, 
                           int, int);
  void sqliteViewTriggers(Parse*, Table*, Expr*, int, ExprList*);

  Parse *pParse,      /* The parse context of the CREATE TRIGGER statement */
  Token *pName1,      /* The name of the trigger */
  Token *pName2,      /* The name of the trigger */
  int tr_tm,          /* One of TK_BEFORE, TK_AFTER, TK_INSTEAD */
  int op,             /* One of TK_INSERT, TK_UPDATE, TK_DELETE */
  IdList *pColumns,   /* column list if this is an UPDATE OF trigger */
  SrcList *pTableName,/* The name of the table/view the trigger applies to */
  int foreach,        /* One of TK_ROW or TK_STATEMENT */
  Expr *pWhen,        /* WHEN clause */
  int isTemp,         /* True if the TEMPORARY keyword is present */
  int noErr           /* Suppress errors if the trigger already exists */
){
  Trigger *pTrigger = 0;
  Table *pTab;
  char *zName = 0;        /* Name of the trigger */

  pTrigger->table = sqliteStrDup(pTableName->a[0].zName);
  pTrigger->pSchema = db->aDb[iDb].pSchema;
  pTrigger->pTabSchema = pTab->pSchema;
  pTrigger->op = op;
  pTrigger->tr_tm = tr_tm==TK_BEFORE ? TRIGGER_BEFORE : TRIGGER_AFTER;
  pTrigger->pWhen = sqlite3ExprDup(pWhen);
  pTrigger->pColumns = sqlite3IdListDup(pColumns);
  pTrigger->foreach = foreach;
  sqlite3TokenCopy(&pTrigger->nameToken,pName);
  assert( pParse->pNewTrigger==0 );
  pParse->pNewTrigger = pTrigger;

trigger_cleanup:
  sqliteFree(zName);
  sqlite3SrcListDelete(pTableName);

      y TEXT
    );
  }
} {}
do_test fkey1-1.2 {
  execsql {
    CREATE TABLE t3(
      a INTEGER REFERENCES t2,
      b INTEGER REFERENCES t1,
      FOREIGN KEY (a,b) REFERENCES t2(x,y)
    );
  }
} {}

do_test fkey1-2.1 {

     } 
  } {1 {no such table: no_such_table}}
}

execsql {
    CREATE TABLE t1(a);
}







execsql {
	CREATE TRIGGER tr1 INSERT ON t1 BEGIN
	  INSERT INTO t1 values(1);
 	END;
}
do_test trigger1-1.2.0 {
    catchsql {

** A header comment placed at the beginning of generated code.
*/
static const char zHdr[] = 
  "/***** This file contains automatically generated code ******\n"
  "**\n"
  "** The code in this file has been automatically generated by\n"
  "**\n"
  "**     $Header: /home/drh/sqlite/trans/cvs/sqlite/sqlite/tool/mkkeywordhash.c,v 1.26 2007/03/27 14:44:52 drh Exp $\n"
  "**\n"
  "** The code in this file implements a function that determines whether\n"
  "** or not a given identifier is really an SQL keyword.  The same thing\n"
  "** might be implemented more directly using a hand-written hash table.\n"
  "** But by using this automatically generated code, the size of the code\n"
  "** is substantially reduced.  This is important for embedded applications\n"
  "** on platforms with limited memory.\n"

  { "REPLACE",          "TK_REPLACE",      CONFLICT               },
  { "RESTRICT",         "TK_RESTRICT",     FKEY                   },
  { "RIGHT",            "TK_JOIN_KW",      ALWAYS                 },
  { "ROLLBACK",         "TK_ROLLBACK",     ALWAYS                 },
  { "ROW",              "TK_ROW",          TRIGGER                },
  { "SELECT",           "TK_SELECT",       ALWAYS                 },
  { "SET",              "TK_SET",          ALWAYS                 },
  { "STATEMENT",        "TK_STATEMENT",    TRIGGER                },
  { "TABLE",            "TK_TABLE",        ALWAYS                 },
  { "TEMP",             "TK_TEMP",         ALWAYS                 },
  { "TEMPORARY",        "TK_TEMP",         ALWAYS                 },
  { "THEN",             "TK_THEN",         ALWAYS                 },
  { "TO",               "TK_TO",           ALTER                  },
  { "TRANSACTION",      "TK_TRANSACTION",  ALWAYS                 },
  { "TRIGGER",          "TK_TRIGGER",      TRIGGER                },

#
# Run this Tcl script to generate the lang-*.html files.
#
set rcsid {$Id: lang.tcl,v 1.127 2007/03/27 15:00:31 drh Exp $}
source common.tcl

if {[llength $argv]>0} {
  set outputdir [lindex $argv 0]
} else {
  set outputdir ""
}

DELETE | 
INSERT | 
UPDATE | 
UPDATE OF <column-list>
}

Syntax {trigger-action} {
[ FOR EACH ROW | FOR EACH STATEMENT ] [ WHEN <expression> ] 
BEGIN 
  <trigger-step> ; [ <trigger-step> ; ]*
END
}

Syntax {trigger-step} {
<update-statement> | <insert-statement> | 

   REPLACE*
   RESTRICT*
   RIGHT
   ROLLBACK
   ROW*
   SELECT
   SET
   STATEMENT*
   TABLE
   TEMP*
   TEMPORARY*
   THEN
   TO
   TRANSACTION
   TRIGGER*