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sqlp.l
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sqlp.l
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%{
/*****************************************************************************
*
* MODULE: SQL statement parser library
*
* AUTHOR(S): lex.l and yac.y were originally taken from unixODBC and
* probably written by Peter Harvey <pharvey@codebydesigns.com>,
* modifications and other code by Radim Blazek
*
* PURPOSE: Parse input string containing SQL statement to
* SQLPSTMT structure.
* SQL parser may be used by simple database drivers.
*
* COPYRIGHT: (C) 2000 by the GRASS Development Team
*
* This program is free software under the GNU General Public
* License (>=v2). Read the file COPYING that comes with GRASS
* for details.
*
*****************************************************************************/
/**************** C-CODE *****************/
%}
%{
#include <grass/sqlp.h>
#include "sqlp.tab.h"
#include <string.h>
#undef YY_INPUT
#define YY_INPUT(b, r, ms) (r = my_yyinput(b, ms))
%}
%{
/*************** LEX HEADER **************/
%}
%e 1200
%{
/**************** LEX BODY ****************/
%}
%%
%{
/***************************************
* LITERALS KEYWORDS TOKENS
***************************************/
/* following case insensitives are ugly
but I do not know better at this time */
%}
[Aa][Dd][Dd] { return ADD; }
[Aa][Ll][Tt][Ee][Rr] { return ALTER; }
[Cc][Oo][Ll][Uu][Mm][Nn] { return COLUMN; }
[Dd][Ee][Ll][Ee][Tt][Ee] { return DELETE; }
[Ff][Rr][Oo][Mm] { return FROM; }
[Ii][Nn][Ss][Ee][Rr][Tt] { return INSERT; }
[Ii][Nn][Tt][Oo] { return INTO; }
[Ss][Ee][Ll][Ee][Cc][Tt] { return SELECT; }
[Ss][Ee][Tt] { return SET; }
[Uu][Pp][Dd][Aa][Tt][Ee] { return UPDATE; }
[Vv][Aa][Ll][Uu][Ee][Ss] { return VALUES; }
[Ww][Hh][Ee][Rr][Ee] { return WHERE; }
[Aa][Nn][Dd] { return AND; }
[Cc][Rr][Ee][Aa][Tt][Ee] { return CREATE; }
[Dd][Rr][Oo][Pp] { return DROP; }
[Tt][Aa][Bb][Ll][Ee] { return TABLE; }
[Nn][Uu][Ll][Ll] { return NULL_VALUE; }
[Vv][Aa][Rr][Cc][Hh][Aa][Rr] { return VARCHAR; }
[Ii][Nn][Tt] { return INT; }
[Ii][Nn][Tt][Ee][Gg][Ee][Rr] { return INTEGER; }
[Dd][Oo][Uu][Bb][Ll][Ee] { return DOUBLE; }
[Pp][Rr][Ee][Cc][Ii][Ss][Ii][Oo][Nn] { return PRECISION; }
[Dd][Aa][Tt][Ee] { return DATE; }
[Tt][Ii][Mm][Ee] { return TIME; }
[Oo][Rr] { return OR; }
[Nn][Oo][Tt] { return NOT; }
[Oo][Rr][Dd][Ee][Rr] { return ORDER; }
[Bb][Yy] { return BY; }
[Aa][Ss][Cc] { return ASC; }
[Dd][Ee][Ss][Cc] { return DESC; }
[Ii][Ss] { return IS; }
[Ll][Ii][Kk][Ee] {
yylval.strval = (char*)strdup("~");
return COMPARISON_OPERATOR;
}
%{
/* [Dd][Ii][Ss][Tt][Ii][Nn][Cc][Tt] { return DISTINCT; } */
/***************************************
* EQUAL
***************************************/
%}
"=" {
return EQUAL;
}
%{
/***************************************
* COMPARISON OPERATOR
***************************************/
%}
"<>" |
"<" |
">" |
"<=" |
">=" |
"~" {
yylval.strval = (char*)strdup(yytext);
return COMPARISON_OPERATOR;
}
%{
/***************************************
* PUNCTUATION
***************************************/
%}
[-+*/:(),.;] {
yylval.strval = (char*)strdup(yytext);
return yytext[0];
}
%{
/***************************************
* NAMES
***************************************/
%}
[A-Za-z][A-Za-z0-9_]* {
yylval.strval = (char*)strdup(yytext);
return NAME;
}
%{
/***************************************
* INTEGER
***************************************/
%}
[0-9]+ {
yylval.intval = atoi(yytext);
/* yylval.strval = (char*)strdup(yytext); */
return INTNUM;
}
%{
/***************************************
* FLOATING POINT NUM
***************************************/
%}
"."[0-9]* |
[0-9]+"."[0-9]* |
[0-9]+[eE][+-]?[0-9]+ |
[0-9]+"."[0-9]*[eE][+-]?[0-9]+ |
"."[0-9]*[eE][+-]?[0-9]+ {
yylval.floatval = atof(yytext);
/* yylval.strval = (char*)strdup(yytext); */
return FLOATNUM;
}
%{
/***************************************
* STRINGS (single quotes)
***************************************/
%}
'[^']*' {
char *Buffer, *ptra, *ptrb;
int c = input();
int len;
Buffer = (char*)strdup(yytext); /* store here because we lose it when unput() */
unput( c ); /* just peeking - checking for a double quote... embedded quote */
if ( c != '\'' )
{
len = strlen (Buffer);
Buffer[len-1] = '\0';
/* Hopefully replace all '' by ' */
ptrb = Buffer + 1;
while ( (ptra = strchr(ptrb, '\'')) != NULL ) {
ptra++; ptrb = ptra;
while ( ptra[1] != 0 ) { ptra[0] = ptra[1]; ptra++; }
ptra[0] = 0;
}
yylval.strval = (char*)strdup(Buffer+1);
free( Buffer );
return STRING;
}
else
{
free( Buffer );
yymore();
}
}
%{
/***************************************
* STRINGS (unterminated)
***************************************/
%}
'[^'\n]*$ { yyerror("Unterminated string"); }
%{
/***************************************
* NEW LINE (ignored)
***************************************/
%}
\n ;
%{
/***************************************
* WHITE SPACE (ignored)
***************************************/
%}
[ \t\r]+ ; /* white space */
%{
/***************************************
* COMMENTS (ignored)
***************************************/
%}
"--".*$ ; /* comment */
%{
/***************************************
* DEFAULT RULE
***************************************/
%}
. { yyerror("Syntax error"); }
%%
/**********************************************************************
*
* C-CODE
*
**********************************************************************/
/**********************************************************************
* my_yyinput
*
* Lexer will ask this function for input when it requires more.
*
**********************************************************************/
int my_yyinput(char *buf, int max_size)
{
int rest, n;
rest = sqlpStmt->stmt + strlen( sqlpStmt->stmt) - sqlpStmt->cur;
n = ( max_size < rest ? max_size : rest );
if ( n > 0 )
{
memcpy( buf, sqlpStmt->cur, n );
sqlpStmt->cur += n;
}
return n;
}
/**********************************************************************
* yyerror
*
* This should be called just before failing. It formats a meaningful
* message and deposits it in a useful place.
*
**********************************************************************/
void yyerror( const char *s )
{
snprintf( sqlpStmt->errmsg, 500, "%s processing '%s'", s, yytext );
#ifdef YY_CURRENT_BUFFER
yy_flush_buffer(YY_CURRENT_BUFFER);
#endif
}
/**********************************************************************
* yywrap
*
* We are not doing any buffer switching but lets not use the Flex version of
* of this func anyway so we can avoid the link dependency.
*
**********************************************************************/
int yywrap()
{
return 1;
}