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SQLite training in Houston TX on 2019-11-05 (details)
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Overview
Comment:Size optimization in the parser. (CVS 2004)
Downloads: Tarball | ZIP archive | SQL archive
Timelines: family | ancestors | descendants | both | trunk
Files: files | file ages | folders
SHA1: 8e2ae2449882f70fe4e77c100193c053d7669ae6
User & Date: drh 2004-10-06 14:39:29
Context
2004-10-06
15:03
Move some work out of the makefiles and into awk scripts in separate files. Ticket #940. (CVS 2005) check-in: 4d0f29d5 user: drh tags: trunk
14:39
Size optimization in the parser. (CVS 2004) check-in: 8e2ae244 user: drh tags: trunk
14:39
Fix the ".import" command of the command-line shell so that it ignores \n and \r at the end of a line. Ticket #939. (CVS 2003) check-in: dcbf4817 user: drh tags: trunk
Changes
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Changes to src/parse.y. 

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**
*************************************************************************
** 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 1.142 2004/10/05 02:41:43 drh Exp $
*/
%token_prefix TK_
%token_type {Token}
%default_type {Token}
%extra_argument {Parse *pParse}
%syntax_error {
  if( pParse->zErrMsg==0 ){
................................................................................
** An instance of this structure holds information about the
** LIMIT clause of a SELECT statement.
*/
struct LimitVal {
  int limit;    /* The LIMIT value.  -1 if there is no limit */
  int offset;   /* The OFFSET.  0 if there is none */
};










/*
** 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)
................................................................................
expr(A) ::= expr(X) BITOR(OP) expr(Y).  {A = sqlite3Expr(@OP, X, Y, 0);}
expr(A) ::= expr(X) LSHIFT(OP) expr(Y). {A = sqlite3Expr(@OP, X, Y, 0);}
expr(A) ::= expr(X) RSHIFT(OP) expr(Y). {A = sqlite3Expr(@OP, X, Y, 0);}
expr(A) ::= expr(X) likeop(OP) expr(Y).  [LIKE]  {
  ExprList *pList = sqlite3ExprListAppend(0, Y, 0);
  pList = sqlite3ExprListAppend(pList, X, 0);
  A = sqlite3ExprFunction(pList, 0);
  if( A ) A->op = OP;
  sqlite3ExprSpan(A, &X->span, &Y->span);
}
expr(A) ::= expr(X) NOT likeop(OP) expr(Y). [LIKE] {
  ExprList *pList = sqlite3ExprListAppend(0, Y, 0);
  pList = sqlite3ExprListAppend(pList, X, 0);
  A = sqlite3ExprFunction(pList, 0);
  if( A ) A->op = OP;
  A = sqlite3Expr(TK_NOT, A, 0, 0);
  sqlite3ExprSpan(A,&X->span,&Y->span);
}
%type likeop {int}
likeop(A) ::= LIKE. {A = TK_LIKE;}
likeop(A) ::= GLOB. {A = TK_GLOB;}


expr(A) ::= expr(X) PLUS(OP) expr(Y).   {A = sqlite3Expr(@OP, X, Y, 0);}
expr(A) ::= expr(X) MINUS(OP) expr(Y).  {A = sqlite3Expr(@OP, X, Y, 0);}
expr(A) ::= expr(X) STAR(OP) expr(Y).   {A = sqlite3Expr(@OP, X, Y, 0);}
expr(A) ::= expr(X) SLASH(OP) expr(Y).  {A = sqlite3Expr(@OP, X, Y, 0);}
expr(A) ::= expr(X) REM(OP) expr(Y).    {A = sqlite3Expr(@OP, X, Y, 0);}
expr(A) ::= expr(X) CONCAT(OP) expr(Y). {A = sqlite3Expr(@OP, X, Y, 0);}
expr(A) ::= expr(X) ISNULL(E). {
................................................................................
  sqlite3ExprSpan(A,&B,&X->span);
}
expr(A) ::= LP(B) select(X) RP(E). {
  A = sqlite3Expr(TK_SELECT, 0, 0, 0);
  if( A ) A->pSelect = X;
  sqlite3ExprSpan(A,&B,&E);
}
expr(A) ::= expr(W) BETWEEN expr(X) AND expr(Y). {
  ExprList *pList = sqlite3ExprListAppend(0, X, 0);
  pList = sqlite3ExprListAppend(pList, Y, 0);
  A = sqlite3Expr(TK_BETWEEN, W, 0, 0);
  if( A ) A->pList = pList;
  sqlite3ExprSpan(A,&W->span,&Y->span);
}
expr(A) ::= expr(W) NOT BETWEEN expr(X) AND expr(Y). {
  ExprList *pList = sqlite3ExprListAppend(0, X, 0);
  pList = sqlite3ExprListAppend(pList, Y, 0);
  A = sqlite3Expr(TK_BETWEEN, W, 0, 0);
  if( A ) A->pList = pList;
  A = sqlite3Expr(TK_NOT, A, 0, 0);
  sqlite3ExprSpan(A,&W->span,&Y->span);
}
expr(A) ::= expr(X) IN LP exprlist(Y) RP(E).  {
  A = sqlite3Expr(TK_IN, X, 0, 0);
  if( A ) A->pList = Y;
  sqlite3ExprSpan(A,&X->span,&E);
}
expr(A) ::= expr(X) IN LP select(Y) RP(E).  {
  A = sqlite3Expr(TK_IN, X, 0, 0);
  if( A ) A->pSelect = Y;
  sqlite3ExprSpan(A,&X->span,&E);
}
expr(A) ::= expr(X) NOT IN LP exprlist(Y) RP(E).  {
  A = sqlite3Expr(TK_IN, X, 0, 0);
  if( A ) A->pList = Y;
  A = sqlite3Expr(TK_NOT, A, 0, 0);
  sqlite3ExprSpan(A,&X->span,&E);
}
expr(A) ::= expr(X) NOT IN LP select(Y) RP(E).  {
  A = sqlite3Expr(TK_IN, X, 0, 0);
  if( A ) A->pSelect = Y;
  A = sqlite3Expr(TK_NOT, A, 0, 0);
  sqlite3ExprSpan(A,&X->span,&E);
}
expr(A) ::= expr(X) IN nm(Y) dbnm(D). {
  SrcList *pSrc = sqlite3SrcListAppend(0, &Y, &D);
  A = sqlite3Expr(TK_IN, X, 0, 0);
  if( A ) A->pSelect = sqlite3SelectNew(0,pSrc,0,0,0,0,0,-1,0);
  sqlite3ExprSpan(A,&X->span,D.z?&D:&Y);
}
expr(A) ::= expr(X) NOT IN nm(Y) dbnm(D). {
  SrcList *pSrc = sqlite3SrcListAppend(0, &Y, &D);
  A = sqlite3Expr(TK_IN, X, 0, 0);
  if( A ) A->pSelect = sqlite3SelectNew(0,pSrc,0,0,0,0,0,-1,0);
  A = sqlite3Expr(TK_NOT, A, 0, 0);
  sqlite3ExprSpan(A,&X->span,D.z?&D:&Y);
}


/* CASE expressions */
expr(A) ::= CASE(C) case_operand(X) case_exprlist(Y) case_else(Z) END(E). {
  A = sqlite3Expr(TK_CASE, X, Z, 0);








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**
*************************************************************************
** 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 1.143 2004/10/06 14:39:29 drh Exp $
*/
%token_prefix TK_
%token_type {Token}
%default_type {Token}
%extra_argument {Parse *pParse}
%syntax_error {
  if( pParse->zErrMsg==0 ){
................................................................................
** An instance of this structure holds information about the
** LIMIT clause of a SELECT statement.
*/
struct LimitVal {
  int limit;    /* The LIMIT value.  -1 if there is no limit */
  int offset;   /* The OFFSET.  0 if there is none */
};

/*
** An instance of this structure is used to store the LIKE,
** GLOB, NOT LIKE, and NOT GLOB operators.
*/
struct LikeOp {
  int opcode;   /* Either TK_GLOB or TK_LIKE */
  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)
................................................................................
expr(A) ::= expr(X) BITOR(OP) expr(Y).  {A = sqlite3Expr(@OP, X, Y, 0);}
expr(A) ::= expr(X) LSHIFT(OP) expr(Y). {A = sqlite3Expr(@OP, X, Y, 0);}
expr(A) ::= expr(X) RSHIFT(OP) expr(Y). {A = sqlite3Expr(@OP, X, Y, 0);}
expr(A) ::= expr(X) likeop(OP) expr(Y).  [LIKE]  {
  ExprList *pList = sqlite3ExprListAppend(0, Y, 0);
  pList = sqlite3ExprListAppend(pList, X, 0);
  A = sqlite3ExprFunction(pList, 0);
  if( A ) A->op = OP.opcode;







  if( OP.not ) A = sqlite3Expr(TK_NOT, A, 0, 0);
  sqlite3ExprSpan(A, &X->span, &Y->span);
}
%type likeop {struct LikeOp}
likeop(A) ::= LIKE.     {A.opcode = TK_LIKE; A.not = 0;}
likeop(A) ::= GLOB.     {A.opcode = TK_GLOB; A.not = 0;}
likeop(A) ::= NOT LIKE. {A.opcode = TK_LIKE; A.not = 1;}
likeop(A) ::= NOT GLOB. {A.opcode = TK_GLOB; A.not = 1;}
expr(A) ::= expr(X) PLUS(OP) expr(Y).   {A = sqlite3Expr(@OP, X, Y, 0);}
expr(A) ::= expr(X) MINUS(OP) expr(Y).  {A = sqlite3Expr(@OP, X, Y, 0);}
expr(A) ::= expr(X) STAR(OP) expr(Y).   {A = sqlite3Expr(@OP, X, Y, 0);}
expr(A) ::= expr(X) SLASH(OP) expr(Y).  {A = sqlite3Expr(@OP, X, Y, 0);}
expr(A) ::= expr(X) REM(OP) expr(Y).    {A = sqlite3Expr(@OP, X, Y, 0);}
expr(A) ::= expr(X) CONCAT(OP) expr(Y). {A = sqlite3Expr(@OP, X, Y, 0);}
expr(A) ::= expr(X) ISNULL(E). {
................................................................................
  sqlite3ExprSpan(A,&B,&X->span);
}
expr(A) ::= LP(B) select(X) RP(E). {
  A = sqlite3Expr(TK_SELECT, 0, 0, 0);
  if( A ) A->pSelect = X;
  sqlite3ExprSpan(A,&B,&E);
}
%type between_op {int}
between_op(A) ::= BETWEEN.     {A = 0;}
between_op(A) ::= NOT BETWEEN. {A = 1;}
expr(A) ::= expr(W) between_op(N) expr(X) AND expr(Y). [BETWEEN] {




  ExprList *pList = sqlite3ExprListAppend(0, X, 0);
  pList = sqlite3ExprListAppend(pList, Y, 0);
  A = sqlite3Expr(TK_BETWEEN, W, 0, 0);
  if( A ) A->pList = pList;
  if( N ) A = sqlite3Expr(TK_NOT, A, 0, 0);
  sqlite3ExprSpan(A,&W->span,&Y->span);
}
%type in_op {int}
in_op(A) ::= IN.      {A = 0;}
in_op(A) ::= NOT IN.  {A = 1;}







expr(A) ::= expr(X) in_op(N) LP exprlist(Y) RP(E). [IN] {
  A = sqlite3Expr(TK_IN, X, 0, 0);
  if( A ) A->pList = Y;
  if( N ) A = sqlite3Expr(TK_NOT, A, 0, 0);
  sqlite3ExprSpan(A,&X->span,&E);
}
expr(A) ::= expr(X) in_op(N) LP select(Y) RP(E).  [IN] {
  A = sqlite3Expr(TK_IN, X, 0, 0);
  if( A ) A->pSelect = Y;
  if( N ) A = sqlite3Expr(TK_NOT, A, 0, 0);
  sqlite3ExprSpan(A,&X->span,&E);
}
expr(A) ::= expr(X) in_op(N) nm(Y) dbnm(D). [IN] {
  SrcList *pSrc = sqlite3SrcListAppend(0, &Y, &D);
  A = sqlite3Expr(TK_IN, X, 0, 0);
  if( A ) A->pSelect = sqlite3SelectNew(0,pSrc,0,0,0,0,0,-1,0);






  if( N ) A = sqlite3Expr(TK_NOT, A, 0, 0);
  sqlite3ExprSpan(A,&X->span,D.z?&D:&Y);
}


/* CASE expressions */
expr(A) ::= CASE(C) case_operand(X) case_exprlist(Y) case_else(Z) END(E). {
  A = sqlite3Expr(TK_CASE, X, Z, 0);

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