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#include <iostream>
#include <wchar.h>
#include "Expressions.hpp"
using namespace std;
COMPILER Query
private:
Expression *expressions;
public:
Expression *getExpressions( ) {
return expressions;
}
CHARACTERS
letter = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz".
digit = "0123456789".
cr = '\r'.
lf = '\n'.
tab = '\t'.
TOKENS
ident = letter { letter | digit }.
COMMENTS FROM "/*" TO "*/" NESTED
IGNORE cr + lf + tab
PRODUCTIONS
Query (. expressions = 0; .)
=
[ BinaryExpr<expressions> ]
EOF
.
BinaryExpr<Expression *&expr> (. expr = 0; Expression *right = 0; .)
=
NotExpr<expr> { (. bool is_and; .)
(
"OR" (. is_and = false; .)
| "AND" (. is_and = true; .)
)
NotExpr<right> (.
if( is_and ) {
expr = new AndExpression( expr, right );
} else {
expr = new OrExpression( expr, right );
}
.)
}
.
NotExpr<Expression *&expr> (. expr = 0; int nots = 0; .)
=
{
"NOT" (. nots++; .)
}
(
"(" BinaryExpr<expr> ")"
|
ident (.
char *ident = coco_string_create_char( t->val );
expr = new Predicate( ident );
coco_string_delete( ident ); .)
) (.
for( int i = 0; i < nots; ++i ) {
expr = new NotExpression( expr );
}
.)
.
END Query.
|
