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// expression_parser.cpp
/**
* Copyright (C) 2013 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/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/db/matcher/expression_parser.h"
#include "mongo/bson/bsonmisc.h"
#include "mongo/bson/bsonobj.h"
#include "mongo/bson/bsonobjbuilder.h"
#include "mongo/bson/bsonobjiterator.h"
#include "mongo/db/matcher/expression_array.h"
#include "mongo/db/matcher/expression_leaf.h"
#include "mongo/db/matcher/expression_tree.h"
#include "mongo/util/mongoutils/str.h"
namespace {
using namespace mongo;
/**
* Returns true if subtree contains MatchExpression 'type'.
*/
bool hasNode(const MatchExpression* root, MatchExpression::MatchType type) {
if (type == root->matchType()) {
return true;
}
for (size_t i = 0; i < root->numChildren(); ++i) {
if (hasNode(root->getChild(i), type)) {
return true;
}
}
return false;
}
} // namespace
namespace mongo {
using std::string;
StatusWithMatchExpression MatchExpressionParser::_parseComparison( const char* name,
ComparisonMatchExpression* cmp,
const BSONElement& e ) {
std::auto_ptr<ComparisonMatchExpression> temp(cmp);
// Non-equality comparison match expressions cannot have
// a regular expression as the argument (e.g. {a: {$gt: /b/}} is illegal).
if (MatchExpression::EQ != cmp->matchType() && RegEx == e.type()) {
std::stringstream ss;
ss << "Can't have RegEx as arg to predicate over field '" << name << "'.";
return StatusWithMatchExpression(Status(ErrorCodes::BadValue, ss.str()));
}
Status s = temp->init( name, e );
if ( !s.isOK() )
return StatusWithMatchExpression(s);
return StatusWithMatchExpression( temp.release() );
}
StatusWithMatchExpression MatchExpressionParser::_parseSubField( const BSONObj& context,
const AndMatchExpression* andSoFar,
const char* name,
const BSONElement& e,
int level ) {
// TODO: these should move to getGtLtOp, or its replacement
if ( mongoutils::str::equals( "$eq", e.fieldName() ) )
return _parseComparison( name, new EqualityMatchExpression(), e );
if ( mongoutils::str::equals( "$not", e.fieldName() ) ) {
return _parseNot( name, e, level );
}
int x = e.getGtLtOp(-1);
switch ( x ) {
case -1:
// $where cannot be a sub-expression because it works on top-level documents only.
if ( mongoutils::str::equals( "$where", e.fieldName() ) ) {
return StatusWithMatchExpression( ErrorCodes::BadValue,
"$where cannot be applied to a field" );
}
return StatusWithMatchExpression( ErrorCodes::BadValue,
mongoutils::str::stream() << "unknown operator: "
<< e.fieldName() );
case BSONObj::LT:
return _parseComparison( name, new LTMatchExpression(), e );
case BSONObj::LTE:
return _parseComparison( name, new LTEMatchExpression(), e );
case BSONObj::GT:
return _parseComparison( name, new GTMatchExpression(), e );
case BSONObj::GTE:
return _parseComparison( name, new GTEMatchExpression(), e );
case BSONObj::NE: {
if (RegEx == e.type()) {
// Just because $ne can be rewritten as the negation of an
// equality does not mean that $ne of a regex is allowed. See SERVER-1705.
return StatusWithMatchExpression(Status(ErrorCodes::BadValue,
"Can't have regex as arg to $ne."));
}
StatusWithMatchExpression s = _parseComparison( name, new EqualityMatchExpression(), e );
if ( !s.isOK() )
return s;
std::auto_ptr<NotMatchExpression> n( new NotMatchExpression() );
Status s2 = n->init( s.getValue() );
if ( !s2.isOK() )
return StatusWithMatchExpression( s2 );
return StatusWithMatchExpression( n.release() );
}
case BSONObj::Equality:
return _parseComparison( name, new EqualityMatchExpression(), e );
case BSONObj::opIN: {
if ( e.type() != Array )
return StatusWithMatchExpression( ErrorCodes::BadValue, "$in needs an array" );
std::auto_ptr<InMatchExpression> temp( new InMatchExpression() );
Status s = temp->init( name );
if ( !s.isOK() )
return StatusWithMatchExpression( s );
s = _parseArrayFilterEntries( temp->getArrayFilterEntries(), e.Obj() );
if ( !s.isOK() )
return StatusWithMatchExpression( s );
return StatusWithMatchExpression( temp.release() );
}
case BSONObj::NIN: {
if ( e.type() != Array )
return StatusWithMatchExpression( ErrorCodes::BadValue, "$nin needs an array" );
std::auto_ptr<InMatchExpression> temp( new InMatchExpression() );
Status s = temp->init( name );
if ( !s.isOK() )
return StatusWithMatchExpression( s );
s = _parseArrayFilterEntries( temp->getArrayFilterEntries(), e.Obj() );
if ( !s.isOK() )
return StatusWithMatchExpression( s );
std::auto_ptr<NotMatchExpression> temp2( new NotMatchExpression() );
s = temp2->init( temp.release() );
if ( !s.isOK() )
return StatusWithMatchExpression( s );
return StatusWithMatchExpression( temp2.release() );
}
case BSONObj::opSIZE: {
int size = 0;
if ( e.type() == String ) {
// matching old odd semantics
size = 0;
}
else if ( e.type() == NumberInt || e.type() == NumberLong ) {
if (e.numberLong() < 0) {
// SERVER-11952. Setting 'size' to -1 means that no documents
// should match this $size expression.
size = -1;
}
else {
size = e.numberInt();
}
}
else if ( e.type() == NumberDouble ) {
if ( e.numberInt() == e.numberDouble() ) {
size = e.numberInt();
}
else {
// old semantcs require exact numeric match
// so [1,2] != 1 or 2
size = -1;
}
}
else {
return StatusWithMatchExpression( ErrorCodes::BadValue, "$size needs a number" );
}
std::auto_ptr<SizeMatchExpression> temp( new SizeMatchExpression() );
Status s = temp->init( name, size );
if ( !s.isOK() )
return StatusWithMatchExpression( s );
return StatusWithMatchExpression( temp.release() );
}
case BSONObj::opEXISTS: {
if ( e.eoo() )
return StatusWithMatchExpression( ErrorCodes::BadValue, "$exists can't be eoo" );
std::auto_ptr<ExistsMatchExpression> temp( new ExistsMatchExpression() );
Status s = temp->init( name );
if ( !s.isOK() )
return StatusWithMatchExpression( s );
if ( e.trueValue() )
return StatusWithMatchExpression( temp.release() );
std::auto_ptr<NotMatchExpression> temp2( new NotMatchExpression() );
s = temp2->init( temp.release() );
if ( !s.isOK() )
return StatusWithMatchExpression( s );
return StatusWithMatchExpression( temp2.release() );
}
case BSONObj::opTYPE: {
if ( !e.isNumber() )
return StatusWithMatchExpression( ErrorCodes::BadValue, "$type has to be a number" );
int type = e.numberInt();
if ( e.type() != NumberInt && type != e.number() )
type = -1;
std::auto_ptr<TypeMatchExpression> temp( new TypeMatchExpression() );
Status s = temp->init( name, type );
if ( !s.isOK() )
return StatusWithMatchExpression( s );
return StatusWithMatchExpression( temp.release() );
}
case BSONObj::opMOD:
return _parseMOD( name, e );
case BSONObj::opOPTIONS: {
// TODO: try to optimize this
// we have to do this since $options can be before or after a $regex
// but we validate here
BSONObjIterator i( context );
while ( i.more() ) {
BSONElement temp = i.next();
if ( temp.getGtLtOp( -1 ) == BSONObj::opREGEX )
return StatusWithMatchExpression( NULL );
}
return StatusWithMatchExpression( ErrorCodes::BadValue, "$options needs a $regex" );
}
case BSONObj::opREGEX: {
return _parseRegexDocument( name, context );
}
case BSONObj::opELEM_MATCH:
return _parseElemMatch( name, e, level );
case BSONObj::opALL:
return _parseAll( name, e, level );
case BSONObj::opWITHIN:
case BSONObj::opGEO_INTERSECTS:
return expressionParserGeoCallback( name, x, context );
}
return StatusWithMatchExpression( ErrorCodes::BadValue,
mongoutils::str::stream() << "not handled: " << e.fieldName() );
}
StatusWithMatchExpression MatchExpressionParser::_parse( const BSONObj& obj, int level ) {
if (level > kMaximumTreeDepth) {
mongoutils::str::stream ss;
ss << "exceeded maximum query tree depth of " << kMaximumTreeDepth
<< " at " << obj.toString();
return StatusWithMatchExpression( ErrorCodes::BadValue, ss );
}
std::auto_ptr<AndMatchExpression> root( new AndMatchExpression() );
bool topLevel = (level == 0);
level++;
BSONObjIterator i( obj );
while ( i.more() ){
BSONElement e = i.next();
if ( e.fieldName()[0] == '$' ) {
const char * rest = e.fieldName() + 1;
// TODO: optimize if block?
if ( mongoutils::str::equals( "or", rest ) ) {
if ( e.type() != Array )
return StatusWithMatchExpression( ErrorCodes::BadValue,
"$or needs an array" );
std::auto_ptr<OrMatchExpression> temp( new OrMatchExpression() );
Status s = _parseTreeList( e.Obj(), temp.get(), level );
if ( !s.isOK() )
return StatusWithMatchExpression( s );
root->add( temp.release() );
}
else if ( mongoutils::str::equals( "and", rest ) ) {
if ( e.type() != Array )
return StatusWithMatchExpression( ErrorCodes::BadValue,
"and needs an array" );
std::auto_ptr<AndMatchExpression> temp( new AndMatchExpression() );
Status s = _parseTreeList( e.Obj(), temp.get(), level );
if ( !s.isOK() )
return StatusWithMatchExpression( s );
root->add( temp.release() );
}
else if ( mongoutils::str::equals( "nor", rest ) ) {
if ( e.type() != Array )
return StatusWithMatchExpression( ErrorCodes::BadValue,
"and needs an array" );
std::auto_ptr<NorMatchExpression> temp( new NorMatchExpression() );
Status s = _parseTreeList( e.Obj(), temp.get(), level );
if ( !s.isOK() )
return StatusWithMatchExpression( s );
root->add( temp.release() );
}
else if ( mongoutils::str::equals( "atomic", rest ) ||
mongoutils::str::equals( "isolated", rest ) ) {
if ( !topLevel )
return StatusWithMatchExpression( ErrorCodes::BadValue,
"$atomic/$isolated has to be at the top level" );
if ( e.trueValue() )
root->add( new AtomicMatchExpression() );
}
else if ( mongoutils::str::equals( "where", rest ) ) {
StatusWithMatchExpression s = _whereCallback->parseWhere(e);
if ( !s.isOK() )
return s;
root->add( s.getValue() );
}
else if ( mongoutils::str::equals( "text", rest ) ) {
if ( e.type() != Object ) {
return StatusWithMatchExpression( ErrorCodes::BadValue,
"$text expects an object" );
}
StatusWithMatchExpression s = expressionParserTextCallback( e.Obj() );
if ( !s.isOK() ) {
return s;
}
root->add( s.getValue() );
}
else if ( mongoutils::str::equals( "comment", rest ) ) {
}
else if ( mongoutils::str::equals( "ref", rest ) ||
mongoutils::str::equals( "id", rest ) ||
mongoutils::str::equals( "db", rest ) ) {
// DBRef fields.
std::auto_ptr<ComparisonMatchExpression> eq( new EqualityMatchExpression() );
Status s = eq->init( e.fieldName(), e );
if ( !s.isOK() )
return StatusWithMatchExpression( s );
root->add( eq.release() );
}
else {
return StatusWithMatchExpression( ErrorCodes::BadValue,
mongoutils::str::stream()
<< "unknown top level operator: "
<< e.fieldName() );
}
continue;
}
if ( _isExpressionDocument( e, false ) ) {
Status s = _parseSub( e.fieldName(), e.Obj(), root.get(), level );
if ( !s.isOK() )
return StatusWithMatchExpression( s );
continue;
}
if ( e.type() == RegEx ) {
StatusWithMatchExpression result = _parseRegexElement( e.fieldName(), e );
if ( !result.isOK() )
return result;
root->add( result.getValue() );
continue;
}
std::auto_ptr<ComparisonMatchExpression> eq( new EqualityMatchExpression() );
Status s = eq->init( e.fieldName(), e );
if ( !s.isOK() )
return StatusWithMatchExpression( s );
root->add( eq.release() );
}
if ( root->numChildren() == 1 ) {
const MatchExpression* real = root->getChild(0);
root->clearAndRelease();
return StatusWithMatchExpression( const_cast<MatchExpression*>(real) );
}
return StatusWithMatchExpression( root.release() );
}
Status MatchExpressionParser::_parseSub( const char* name,
const BSONObj& sub,
AndMatchExpression* root,
int level ) {
// The one exception to {field : {fully contained argument} } is, of course, geo. Example:
// sub == { field : {$near[Sphere]: [0,0], $maxDistance: 1000, $minDistance: 10 } }
// We peek inside of 'sub' to see if it's possibly a $near. If so, we can't iterate over
// its subfields and parse them one at a time (there is no $maxDistance without $near), so
// we hand the entire object over to the geo parsing routines.
if (level > kMaximumTreeDepth) {
mongoutils::str::stream ss;
ss << "exceeded maximum query tree depth of " << kMaximumTreeDepth
<< " at " << sub.toString();
return Status( ErrorCodes::BadValue, ss );
}
level++;
BSONObjIterator geoIt(sub);
if (geoIt.more()) {
BSONElement firstElt = geoIt.next();
if (firstElt.isABSONObj()) {
const char* fieldName = firstElt.fieldName();
// TODO: Having these $fields here isn't ideal but we don't want to pull in anything
// from db/geo at this point, since it may not actually be linked in...
if (mongoutils::str::equals(fieldName, "$near")
|| mongoutils::str::equals(fieldName, "$nearSphere")
|| mongoutils::str::equals(fieldName, "$geoNear")
|| mongoutils::str::equals(fieldName, "$maxDistance")
|| mongoutils::str::equals(fieldName, "$minDistance")) {
StatusWithMatchExpression s = expressionParserGeoCallback(name,
firstElt.getGtLtOp(),
sub);
if (s.isOK()) {
root->add(s.getValue());
}
// Propagate geo parsing result to caller.
return s.getStatus();
}
}
}
BSONObjIterator j( sub );
while ( j.more() ) {
BSONElement deep = j.next();
StatusWithMatchExpression s = _parseSubField( sub, root, name, deep, level );
if ( !s.isOK() )
return s.getStatus();
if ( s.getValue() )
root->add( s.getValue() );
}
return Status::OK();
}
bool MatchExpressionParser::_isExpressionDocument( const BSONElement& e,
bool allowIncompleteDBRef ) {
if ( e.type() != Object )
return false;
BSONObj o = e.Obj();
if ( o.isEmpty() )
return false;
const char* name = o.firstElement().fieldName();
if ( name[0] != '$' )
return false;
if ( _isDBRefDocument( o, allowIncompleteDBRef ) ) {
return false;
}
return true;
}
/**
* DBRef fields are ordered in the collection.
* In the query, we consider an embedded object a query on
* a DBRef as long as it contains $ref and $id.
* Required fields: $ref and $id (if incomplete DBRefs are not allowed)
*
* If incomplete DBRefs are allowed, we accept the BSON object as long as it
* contains $ref, $id or $db.
*
* Field names are checked but not field types.
*/
bool MatchExpressionParser::_isDBRefDocument( const BSONObj& obj, bool allowIncompleteDBRef ) {
bool hasRef = false;
bool hasID = false;
bool hasDB = false;
BSONObjIterator i( obj );
while ( i.more() && !( hasRef && hasID ) ) {
BSONElement element = i.next();
const char *fieldName = element.fieldName();
// $ref
if ( !hasRef && mongoutils::str::equals( "$ref", fieldName ) ) {
hasRef = true;
}
// $id
else if ( !hasID && mongoutils::str::equals( "$id", fieldName ) ) {
hasID = true;
}
// $db
else if ( !hasDB && mongoutils::str::equals( "$db", fieldName ) ) {
hasDB = true;
}
}
if (allowIncompleteDBRef) {
return hasRef || hasID || hasDB;
}
return hasRef && hasID;
}
StatusWithMatchExpression MatchExpressionParser::_parseMOD( const char* name,
const BSONElement& e ) {
if ( e.type() != Array )
return StatusWithMatchExpression( ErrorCodes::BadValue, "malformed mod, needs to be an array" );
BSONObjIterator i( e.Obj() );
if ( !i.more() )
return StatusWithMatchExpression( ErrorCodes::BadValue, "malformed mod, not enough elements" );
BSONElement d = i.next();
if ( !d.isNumber() )
return StatusWithMatchExpression( ErrorCodes::BadValue, "malformed mod, divisor not a number" );
if ( !i.more() )
return StatusWithMatchExpression( ErrorCodes::BadValue, "malformed mod, not enough elements" );
BSONElement r = i.next();
if ( !d.isNumber() )
return StatusWithMatchExpression( ErrorCodes::BadValue, "malformed mod, remainder not a number" );
if ( i.more() )
return StatusWithMatchExpression( ErrorCodes::BadValue, "malformed mod, too many elements" );
std::auto_ptr<ModMatchExpression> temp( new ModMatchExpression() );
Status s = temp->init( name, d.numberInt(), r.numberInt() );
if ( !s.isOK() )
return StatusWithMatchExpression( s );
return StatusWithMatchExpression( temp.release() );
}
StatusWithMatchExpression MatchExpressionParser::_parseRegexElement( const char* name,
const BSONElement& e ) {
if ( e.type() != RegEx )
return StatusWithMatchExpression( ErrorCodes::BadValue, "not a regex" );
std::auto_ptr<RegexMatchExpression> temp( new RegexMatchExpression() );
Status s = temp->init( name, e.regex(), e.regexFlags() );
if ( !s.isOK() )
return StatusWithMatchExpression( s );
return StatusWithMatchExpression( temp.release() );
}
StatusWithMatchExpression MatchExpressionParser::_parseRegexDocument( const char* name,
const BSONObj& doc ) {
string regex;
string regexOptions;
BSONObjIterator i( doc );
while ( i.more() ) {
BSONElement e = i.next();
switch ( e.getGtLtOp() ) {
case BSONObj::opREGEX:
if ( e.type() == String ) {
regex = e.String();
}
else if ( e.type() == RegEx ) {
regex = e.regex();
regexOptions = e.regexFlags();
}
else {
return StatusWithMatchExpression( ErrorCodes::BadValue,
"$regex has to be a string" );
}
break;
case BSONObj::opOPTIONS:
if ( e.type() != String )
return StatusWithMatchExpression( ErrorCodes::BadValue,
"$options has to be a string" );
regexOptions = e.String();
break;
default:
break;
}
}
std::auto_ptr<RegexMatchExpression> temp( new RegexMatchExpression() );
Status s = temp->init( name, regex, regexOptions );
if ( !s.isOK() )
return StatusWithMatchExpression( s );
return StatusWithMatchExpression( temp.release() );
}
Status MatchExpressionParser::_parseArrayFilterEntries( ArrayFilterEntries* entries,
const BSONObj& theArray ) {
BSONObjIterator i( theArray );
while ( i.more() ) {
BSONElement e = i.next();
// allow DBRefs but reject all fields with names starting wiht $
if ( _isExpressionDocument( e, false ) ) {
return Status( ErrorCodes::BadValue, "cannot nest $ under $in" );
}
if ( e.type() == RegEx ) {
std::auto_ptr<RegexMatchExpression> r( new RegexMatchExpression() );
Status s = r->init( "", e );
if ( !s.isOK() )
return s;
s = entries->addRegex( r.release() );
if ( !s.isOK() )
return s;
}
else {
Status s = entries->addEquality( e );
if ( !s.isOK() )
return s;
}
}
return Status::OK();
}
StatusWithMatchExpression MatchExpressionParser::_parseElemMatch( const char* name,
const BSONElement& e,
int level ) {
if ( e.type() != Object )
return StatusWithMatchExpression( ErrorCodes::BadValue, "$elemMatch needs an Object" );
BSONObj obj = e.Obj();
// $elemMatch value case applies when the children all
// work on the field 'name'.
// This is the case when:
// 1) the argument is an expression document; and
// 2) expression is not a AND/NOR/OR logical operator. Children of
// these logical operators are initialized with field names.
// 3) expression is not a WHERE operator. WHERE works on objects instead
// of specific field.
bool isElemMatchValue = false;
if ( _isExpressionDocument( e, true ) ) {
BSONObj o = e.Obj();
BSONElement elt = o.firstElement();
invariant( !elt.eoo() );
isElemMatchValue = !mongoutils::str::equals( "$and", elt.fieldName() ) &&
!mongoutils::str::equals( "$nor", elt.fieldName() ) &&
!mongoutils::str::equals( "$or", elt.fieldName() ) &&
!mongoutils::str::equals( "$where", elt.fieldName() );
}
if ( isElemMatchValue ) {
// value case
AndMatchExpression theAnd;
Status s = _parseSub( "", obj, &theAnd, level );
if ( !s.isOK() )
return StatusWithMatchExpression( s );
std::auto_ptr<ElemMatchValueMatchExpression> temp( new ElemMatchValueMatchExpression() );
s = temp->init( name );
if ( !s.isOK() )
return StatusWithMatchExpression( s );
for ( size_t i = 0; i < theAnd.numChildren(); i++ ) {
temp->add( theAnd.getChild( i ) );
}
theAnd.clearAndRelease();
return StatusWithMatchExpression( temp.release() );
}
// DBRef value case
// A DBRef document under a $elemMatch should be treated as an object case
// because it may contain non-DBRef fields in addition to $ref, $id and $db.
// object case
StatusWithMatchExpression subRaw = _parse( obj, level );
if ( !subRaw.isOK() )
return subRaw;
std::auto_ptr<MatchExpression> sub( subRaw.getValue() );
// $where is not supported under $elemMatch because $where
// applies to top-level document, not array elements in a field.
if ( hasNode( sub.get(), MatchExpression::WHERE ) ) {
return StatusWithMatchExpression( ErrorCodes::BadValue,
"$elemMatch cannot contain $where expression" );
}
std::auto_ptr<ElemMatchObjectMatchExpression> temp( new ElemMatchObjectMatchExpression() );
Status status = temp->init( name, sub.release() );
if ( !status.isOK() )
return StatusWithMatchExpression( status );
return StatusWithMatchExpression( temp.release() );
}
StatusWithMatchExpression MatchExpressionParser::_parseAll( const char* name,
const BSONElement& e,
int level ) {
if ( e.type() != Array )
return StatusWithMatchExpression( ErrorCodes::BadValue, "$all needs an array" );
BSONObj arr = e.Obj();
std::auto_ptr<AndMatchExpression> myAnd( new AndMatchExpression() );
BSONObjIterator i( arr );
if ( arr.firstElement().type() == Object &&
mongoutils::str::equals( "$elemMatch",
arr.firstElement().Obj().firstElement().fieldName() ) ) {
// $all : [ { $elemMatch : {} } ... ]
while ( i.more() ) {
BSONElement hopefullyElemMatchElement = i.next();
if ( hopefullyElemMatchElement.type() != Object ) {
// $all : [ { $elemMatch : ... }, 5 ]
return StatusWithMatchExpression( ErrorCodes::BadValue,
"$all/$elemMatch has to be consistent" );
}
BSONObj hopefullyElemMatchObj = hopefullyElemMatchElement.Obj();
if ( !mongoutils::str::equals( "$elemMatch",
hopefullyElemMatchObj.firstElement().fieldName() ) ) {
// $all : [ { $elemMatch : ... }, { x : 5 } ]
return StatusWithMatchExpression( ErrorCodes::BadValue,
"$all/$elemMatch has to be consistent" );
}
StatusWithMatchExpression inner =
_parseElemMatch( name, hopefullyElemMatchObj.firstElement(), level );
if ( !inner.isOK() )
return inner;
myAnd->add( inner.getValue() );
}
return StatusWithMatchExpression( myAnd.release() );
}
while ( i.more() ) {
BSONElement e = i.next();
if ( e.type() == RegEx ) {
std::auto_ptr<RegexMatchExpression> r( new RegexMatchExpression() );
Status s = r->init( name, e );
if ( !s.isOK() )
return StatusWithMatchExpression( s );
myAnd->add( r.release() );
}
else if ( e.type() == Object && e.Obj().firstElement().getGtLtOp(-1) != -1 ) {
return StatusWithMatchExpression( ErrorCodes::BadValue, "no $ expressions in $all" );
}
else {
std::auto_ptr<EqualityMatchExpression> x( new EqualityMatchExpression() );
Status s = x->init( name, e );
if ( !s.isOK() )
return StatusWithMatchExpression( s );
myAnd->add( x.release() );
}
}
if ( myAnd->numChildren() == 0 ) {
return StatusWithMatchExpression( new FalseMatchExpression() );
}
return StatusWithMatchExpression( myAnd.release() );
}
StatusWithMatchExpression MatchExpressionParser::WhereCallback::parseWhere(
const BSONElement& where) const {
return StatusWithMatchExpression(ErrorCodes::NoWhereParseContext,
"no context for parsing $where");
}
// Geo
StatusWithMatchExpression expressionParserGeoCallbackDefault( const char* name,
int type,
const BSONObj& section ) {
return StatusWithMatchExpression( ErrorCodes::BadValue, "geo not linked in" );
}
MatchExpressionParserGeoCallback expressionParserGeoCallback =
expressionParserGeoCallbackDefault;
// Text
StatusWithMatchExpression expressionParserTextCallbackDefault( const BSONObj& queryObj ) {
return StatusWithMatchExpression( ErrorCodes::BadValue, "$text not linked in" );
}
MatchExpressionParserTextCallback expressionParserTextCallback =
expressionParserTextCallbackDefault;
}
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