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// matcher.h
/* JSMatcher is our boolean expression evaluator for "where" clauses */
/**
* Copyright (C) 2008 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include "jsobj.h"
#include <pcrecpp.h>
namespace mongo {
class RegexMatcher {
public:
const char *fieldName;
pcrecpp::RE *re;
RegexMatcher() {
re = 0;
}
~RegexMatcher() {
delete re;
}
};
class BasicMatcher {
public:
BSONElement toMatch;
int compareOp;
};
// SQL where clause equivalent
class Where;
class DiskLoc;
/* Match BSON objects against a query pattern.
e.g.
db.foo.find( { a : 3 } );
{ a : 3 } is the pattern object.
GT/LT:
{ a : { $gt : 3 } }
Not equal:
{ a : { $ne : 3 } }
TODO: we should rewrite the matcher to be more an AST style.
*/
class JSMatcher : boost::noncopyable {
int matchesDotted(
const char *fieldName,
const BSONElement& toMatch, const BSONObj& obj,
int compareOp, bool *deep, bool isArr = false);
struct element_lt
{
bool operator()(const BSONElement& l, const BSONElement& r) const
{
int x = (int) l.type() - (int) r.type();
if ( x < 0 ) return true;
if ( x > 0 ) return false;
return compareElementValues(l,r) < 0;
}
};
public:
enum {
Equality = 0,
LT = 0x1,
LTE = 0x3,
GTE = 0x6,
GT = 0x4,
opIN = 0x8, // { x : { $in : [1,2,3] } }
NE = 0x9
};
static int opDirection(int op) {
return op <= LTE ? -1 : 1;
}
// Only specify constrainIndexKey if matches() will be called with
// index keys having empty string field names.
JSMatcher(const BSONObj &pattern, const BSONObj &constrainIndexKey = BSONObj());
~JSMatcher();
/* deep - means we looked into arrays for a match
*/
bool matches(const BSONObj& j, bool *deep = 0);
int getN() {
return n;
}
bool trivial() const { return n == 0 && nRegex == 0 && where == 0; }
private:
void addBasic(BSONElement e, int c) {
// TODO May want to selectively ignore these element types based on op type.
if ( e.type() == MinKey || e.type() == MaxKey )
return;
BasicMatcher bm;
bm.toMatch = e;
bm.compareOp = c;
basics.push_back(bm);
n++;
}
int valuesMatch(const BSONElement& l, const BSONElement& r, int op);
set<BSONElement,element_lt> *in; // set if query uses $in
Where *where; // set if query uses $where
BSONObj jsobj; // the query pattern. e.g., { name: "joe" }
BSONObj constrainIndexKey_;
vector<BasicMatcher> basics;
int n; // # of basicmatcher items
RegexMatcher regexs[4];
int nRegex;
// so we delete the mem when we're done:
BSONObjBuilder *builders[8];
int nBuilders;
};
// If match succeeds on index key, then attempt to match full record.
class KeyValJSMatcher : boost::noncopyable {
public:
KeyValJSMatcher(const BSONObj &pattern, const BSONObj &indexKeyPattern);
bool matches(const BSONObj &j, bool *deep = 0);
bool matches(const BSONObj &key, const DiskLoc &recLoc, bool *deep = 0);
private:
JSMatcher keyMatcher_;
JSMatcher recordMatcher_;
};
} // namespace mongo
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