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sqlp.y
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sqlp.y
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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.
*
*****************************************************************************/
%{
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <grass/sqlp.h>
#define YYDEBUG 1
#define YYERROR_VERBOSE 1
%}
/* symbolic tokens */
%union {
int intval;
double floatval;
char *strval;
int subtok;
SQLPNODE *node;
}
/* operators */
%type <node> y_column
%type <node> y_value
%type <node> y_atom
%type <node> y_term
%type <node> y_product
%type <node> y_expression
%type <node> y_comparison
%type <node> y_boolean
%type <node> y_sub_condition2
%type <node> y_sub_condition
%type <node> y_condition
/* literal keyword tokens */
%token <strval> COMPARISON_OPERATOR
%token <strval> NAME
%token <strval> STRING
%token <intval> INTNUM
%token <floatval> FLOATNUM
%token ADD
%token DROP
%token COLUMN
%token EQUAL
%token SELECT FROM WHERE
%token DELETE
%token INSERT INTO VALUES
%token UPDATE SET
%token AND
%token OR
%token NOT
%token ALTER TABLE
%token CREATE
%token NULL_VALUE
%token VARCHAR
%token INT
%token INTEGER
%token DOUBLE
%token PRECISION
%token DATE
%token TIME
%token ORDER BY
%token IS
%token ASC
%token DESC
%{
extern int yylex(void);
%}
%%
y_sql:
y_alter
| y_create
| y_drop
| y_insert
| y_select
| y_update
| y_delete
| y_sql ';'
;
y_alter:
ALTER TABLE y_table ADD COLUMN y_columndef { sqpCommand(SQLP_ADD_COLUMN); }
| ALTER TABLE y_table ADD y_columndef { sqpCommand(SQLP_ADD_COLUMN); }
| ALTER TABLE y_table DROP COLUMN NAME { sqpCommand(SQLP_DROP_COLUMN); sqpColumn($6);}
;
y_create:
CREATE TABLE y_table '(' y_columndefs ')' { sqpCommand(SQLP_CREATE); }
;
y_drop:
DROP TABLE y_table { sqpCommand(SQLP_DROP); }
;
y_select:
SELECT y_columns FROM y_table { sqpCommand(SQLP_SELECT); }
| SELECT y_columns FROM y_table WHERE y_condition { sqpCommand(SQLP_SELECT); }
| SELECT y_columns FROM y_table ORDER BY y_order { sqpCommand(SQLP_SELECT); }
| SELECT y_columns FROM y_table WHERE y_condition ORDER BY y_order { sqpCommand(SQLP_SELECT); }
;
y_delete:
DELETE FROM y_table { sqpCommand(SQLP_DELETE); }
| DELETE FROM y_table WHERE y_condition { sqpCommand(SQLP_DELETE); }
;
y_insert:
INSERT INTO y_table y_values { sqpCommand(SQLP_INSERT); }
| INSERT INTO y_table '(' y_columns ')' y_values { sqpCommand(SQLP_INSERT); }
;
y_update:
UPDATE y_table SET y_assignments { sqpCommand(SQLP_UPDATE); }
| UPDATE y_table SET y_assignments WHERE y_condition { sqpCommand(SQLP_UPDATE); }
;
y_columndefs:
y_columndef
| y_columndefs ',' y_columndef
;
y_columndef:
NAME VARCHAR '(' INTNUM ')' { sqpColumnDef( $1, SQLP_VARCHAR, $4, 0 ); }
| NAME INT { sqpColumnDef( $1, SQLP_INTEGER, 0, 0 ); }
| NAME INTEGER { sqpColumnDef( $1, SQLP_INTEGER, 0, 0 ); }
| NAME DOUBLE { sqpColumnDef( $1, SQLP_DOUBLE, 0, 0 ); }
| NAME DOUBLE PRECISION { sqpColumnDef( $1, SQLP_DOUBLE, 0, 0 ); }
| NAME DATE { sqpColumnDef( $1, SQLP_DATE, 0, 0 ); }
| NAME TIME { sqpColumnDef( $1, SQLP_TIME, 0, 0 ); }
;
y_columns:
'*'
| y_column_list
;
y_column_list:
NAME { sqpColumn( $1 ); }
| y_column_list ',' NAME { sqpColumn( $3 ); }
;
y_table:
NAME { sqpTable( $1 ); }
;
y_values:
VALUES '(' y_value_list ')'
;
y_value_list:
NULL_VALUE { sqpValue( NULL, 0, 0.0, SQLP_NULL ); }
| STRING { sqpValue( $1, 0, 0.0, SQLP_S ); }
| INTNUM { sqpValue( NULL, $1, 0.0, SQLP_I ); }
| '-' INTNUM { sqpValue( NULL, -$2, 0.0, SQLP_I ); }
| FLOATNUM { sqpValue( NULL, 0, $1, SQLP_D ); }
| '-' FLOATNUM { sqpValue( NULL, 0, -$2, SQLP_D ); }
| y_value_list ',' NULL_VALUE { sqpValue( NULL, 0, 0.0, SQLP_NULL ); }
| y_value_list ',' STRING { sqpValue( $3, 0, 0.0, SQLP_S ); }
| y_value_list ',' INTNUM { sqpValue( NULL, $3, 0.0, SQLP_I ); }
| y_value_list ',' '-' INTNUM { sqpValue( NULL, -$4, 0.0, SQLP_I ); }
| y_value_list ',' FLOATNUM { sqpValue( NULL, 0, $3, SQLP_D ); }
| y_value_list ',' '-' FLOATNUM { sqpValue( NULL, 0, -$4, SQLP_D ); }
;
y_assignments:
y_assignment
| y_assignments ',' y_assignment
;
y_assignment:
NAME EQUAL NULL_VALUE { sqpAssignment( $1, NULL, 0, 0.0, NULL, SQLP_NULL ); }
/* | NAME EQUAL STRING { sqpAssignment( $1, $3, 0, 0.0, NULL, SQLP_S ); }
| NAME EQUAL INTNUM { sqpAssignment( $1, NULL, $3, 0.0, NULL, SQLP_I ); }
| NAME EQUAL FLOATNUM { sqpAssignment( $1, NULL, 0, $3, NULL, SQLP_D ); }
*/ | NAME EQUAL y_expression { sqpAssignment( $1, NULL, 0, 0.0, $3, SQLP_EXPR ); }
;
y_condition:
y_sub_condition {
$$ = $1;
sqlpStmt->upperNodeptr = $$;
}
;
y_sub_condition:
y_sub_condition2 { $$ = $1; }
| y_sub_condition OR y_sub_condition2 { $$ = sqpNewExpressionNode (SQLP_OR, $1, $3); }
;
y_sub_condition2:
y_boolean { $$ = $1; }
| y_sub_condition2 AND y_boolean { $$ = sqpNewExpressionNode (SQLP_AND, $1, $3); }
;
y_boolean:
y_comparison { $$ = $1; }
| '(' y_sub_condition ')' { $$ = $2; }
| NOT y_boolean { $$ = sqpNewExpressionNode ( SQLP_NOT, NULL, $2); }
;
/* Note EQUAL should be one of COMPARISON but there is maybe some reason ... */
y_comparison:
y_expression EQUAL y_expression {
$$ = sqpNewExpressionNode ( SQLP_EQ, $1, $3);
}
| y_expression COMPARISON_OPERATOR y_expression {
$$ = sqpNewExpressionNode ( sqpOperatorCode($2), $1, $3);
}
| y_expression IS NULL_VALUE {
$$ = sqpNewExpressionNode ( SQLP_ISNULL, NULL, $1);
}
| y_expression NOT NULL_VALUE {
$$ = sqpNewExpressionNode ( SQLP_NOTNULL, NULL, $1);
}
;
/* Mathematical expression */
y_expression:
y_product { $$ = $1; }
| y_expression '+' y_product {
$$ = sqpNewExpressionNode ( sqpOperatorCode("+"), $1, $3 );
}
| y_expression '-' y_product {
$$ = sqpNewExpressionNode ( sqpOperatorCode("-"), $1, $3 );
}
;
y_product:
y_term { $$ = $1; }
| y_product '*' y_term {
$$ = sqpNewExpressionNode ( sqpOperatorCode("*"), $1, $3 );
}
| y_product '/' y_term {
$$ = sqpNewExpressionNode ( sqpOperatorCode("/"), $1, $3 );
}
;
y_term:
y_atom { $$ = $1; }
| '-' y_term {
$$ = sqpNewExpressionNode ( sqpOperatorCode("-"), sqpNewValueNode ( NULL, 0, 0.0, SQLP_I ), $2 );
}
;
y_atom:
y_value { $$ = $1; }
| y_column { $$ = $1; }
| '(' y_expression ')' { $$ = $2; }
;
/* Value used in expressions */
y_value:
STRING { $$ = sqpNewValueNode ( $1, 0, 0.0, SQLP_S ); }
| INTNUM { $$ = sqpNewValueNode ( NULL, $1, 0.0, SQLP_I ); }
| FLOATNUM { $$ = sqpNewValueNode ( NULL, 0, $1, SQLP_D ); }
;
/* Column used in expressions */
y_column:
NAME {$$ = sqpNewColumnNode ( $1 );}
;
y_order: y_order_asc | y_order_desc;
y_order_asc:
NAME { sqpOrderColumn( $1, SORT_ASC ); }
| NAME ASC { sqpOrderColumn( $1, SORT_ASC ); }
;
y_order_desc:
NAME DESC { sqpOrderColumn( $1, SORT_DESC ); }
;
%%