// expression_parser_leaf_test.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.
 */

#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kDefault

#include "mongo/unittest/unittest.h"

#include "mongo/db/matcher/expression_parser.h"

#include "mongo/db/jsobj.h"
#include "mongo/db/json.h"
#include "mongo/db/matcher/expression.h"
#include "mongo/db/matcher/expression_leaf.h"
#include "mongo/util/log.h"

namespace mongo {

using std::endl;
using std::string;

TEST(MatchExpressionParserLeafTest, SimpleEQ2) {
    BSONObj query = BSON("x" << BSON("$eq" << 2));
    StatusWithMatchExpression result = MatchExpressionParser::parse(query);
    ASSERT_TRUE(result.isOK());
    std::unique_ptr<MatchExpression> destroy(result.getValue());

    ASSERT(!result.getValue()->matchesBSON(BSON("x" << 1)));
    ASSERT(result.getValue()->matchesBSON(BSON("x" << 2)));
    ASSERT(!result.getValue()->matchesBSON(BSON("x" << 3)));
}

TEST(MatchExpressionParserLeafTest, SimpleEQUndefined) {
    BSONObj query = BSON("x" << BSON("$eq" << BSONUndefined));
    StatusWithMatchExpression result = MatchExpressionParser::parse(query);
    ASSERT_FALSE(result.isOK());
}

TEST(MatchExpressionParserLeafTest, SimpleGT1) {
    BSONObj query = BSON("x" << BSON("$gt" << 2));
    StatusWithMatchExpression result = MatchExpressionParser::parse(query);
    ASSERT_TRUE(result.isOK());
    std::unique_ptr<MatchExpression> destroy(result.getValue());

    ASSERT(!result.getValue()->matchesBSON(BSON("x" << 2)));
    ASSERT(result.getValue()->matchesBSON(BSON("x" << 3)));
}

TEST(MatchExpressionParserLeafTest, SimpleLT1) {
    BSONObj query = BSON("x" << BSON("$lt" << 2));
    StatusWithMatchExpression result = MatchExpressionParser::parse(query);
    ASSERT_TRUE(result.isOK());
    std::unique_ptr<MatchExpression> destroy(result.getValue());

    ASSERT(result.getValue()->matchesBSON(BSON("x" << 1)));
    ASSERT(!result.getValue()->matchesBSON(BSON("x" << 2)));
    ASSERT(!result.getValue()->matchesBSON(BSON("x" << 3)));
}

TEST(MatchExpressionParserLeafTest, SimpleGTE1) {
    BSONObj query = BSON("x" << BSON("$gte" << 2));
    StatusWithMatchExpression result = MatchExpressionParser::parse(query);
    ASSERT_TRUE(result.isOK());
    std::unique_ptr<MatchExpression> destroy(result.getValue());

    ASSERT(!result.getValue()->matchesBSON(BSON("x" << 1)));
    ASSERT(result.getValue()->matchesBSON(BSON("x" << 2)));
    ASSERT(result.getValue()->matchesBSON(BSON("x" << 3)));
}

TEST(MatchExpressionParserLeafTest, SimpleLTE1) {
    BSONObj query = BSON("x" << BSON("$lte" << 2));
    StatusWithMatchExpression result = MatchExpressionParser::parse(query);
    ASSERT_TRUE(result.isOK());
    std::unique_ptr<MatchExpression> destroy(result.getValue());

    ASSERT(result.getValue()->matchesBSON(BSON("x" << 1)));
    ASSERT(result.getValue()->matchesBSON(BSON("x" << 2)));
    ASSERT(!result.getValue()->matchesBSON(BSON("x" << 3)));
}

TEST(MatchExpressionParserLeafTest, SimpleNE1) {
    BSONObj query = BSON("x" << BSON("$ne" << 2));
    StatusWithMatchExpression result = MatchExpressionParser::parse(query);
    ASSERT_TRUE(result.isOK());
    std::unique_ptr<MatchExpression> destroy(result.getValue());

    ASSERT(result.getValue()->matchesBSON(BSON("x" << 1)));
    ASSERT(!result.getValue()->matchesBSON(BSON("x" << 2)));
    ASSERT(result.getValue()->matchesBSON(BSON("x" << 3)));
}

TEST(MatchExpressionParserLeafTest, SimpleModBad1) {
    BSONObj query = BSON("x" << BSON("$mod" << BSON_ARRAY(3 << 2)));
    StatusWithMatchExpression result = MatchExpressionParser::parse(query);
    ASSERT_TRUE(result.isOK());
    std::unique_ptr<MatchExpression> destroy1(result.getValue());

    query = BSON("x" << BSON("$mod" << BSON_ARRAY(3)));
    result = MatchExpressionParser::parse(query);
    ASSERT_TRUE(!result.isOK());

    query = BSON("x" << BSON("$mod" << BSON_ARRAY(3 << 2 << 4)));
    result = MatchExpressionParser::parse(query);
    ASSERT_TRUE(!result.isOK());

    query = BSON("x" << BSON("$mod" << BSON_ARRAY("q" << 2)));
    result = MatchExpressionParser::parse(query);
    ASSERT_TRUE(!result.isOK());

    query = BSON("x" << BSON("$mod" << 3));
    result = MatchExpressionParser::parse(query);
    ASSERT_TRUE(!result.isOK());

    query = BSON("x" << BSON("$mod" << BSON("a" << 1 << "b" << 2)));
    result = MatchExpressionParser::parse(query);
    ASSERT_TRUE(!result.isOK());
}

TEST(MatchExpressionParserLeafTest, SimpleMod1) {
    BSONObj query = BSON("x" << BSON("$mod" << BSON_ARRAY(3 << 2)));
    StatusWithMatchExpression result = MatchExpressionParser::parse(query);
    ASSERT_TRUE(result.isOK());
    std::unique_ptr<MatchExpression> destroy(result.getValue());

    ASSERT(result.getValue()->matchesBSON(BSON("x" << 5)));
    ASSERT(!result.getValue()->matchesBSON(BSON("x" << 4)));
    ASSERT(result.getValue()->matchesBSON(BSON("x" << 8)));
}

TEST(MatchExpressionParserLeafTest, SimpleModNotNumber) {
    BSONObj query = BSON("x" << BSON("$mod" << BSON_ARRAY(2 << "r")));
    StatusWithMatchExpression result = MatchExpressionParser::parse(query);
    ASSERT_TRUE(result.isOK());
    std::unique_ptr<MatchExpression> destroy(result.getValue());

    ASSERT(result.getValue()->matchesBSON(BSON("x" << 2)));
    ASSERT(result.getValue()->matchesBSON(BSON("x" << 4)));
    ASSERT(!result.getValue()->matchesBSON(BSON("x" << 5)));
    ASSERT(!result.getValue()->matchesBSON(BSON("x"
                                                << "a")));
}


TEST(MatchExpressionParserLeafTest, SimpleIN1) {
    BSONObj query = BSON("x" << BSON("$in" << BSON_ARRAY(2 << 3)));
    StatusWithMatchExpression result = MatchExpressionParser::parse(query);
    ASSERT_TRUE(result.isOK());
    std::unique_ptr<MatchExpression> destroy(result.getValue());

    ASSERT(!result.getValue()->matchesBSON(BSON("x" << 1)));
    ASSERT(result.getValue()->matchesBSON(BSON("x" << 2)));
    ASSERT(result.getValue()->matchesBSON(BSON("x" << 3)));
}

TEST(MatchExpressionParserLeafTest, INSingleDBRef) {
    OID oid = OID::gen();
    BSONObj query = BSON("x" << BSON("$in" << BSON_ARRAY(BSON("$ref"
                                                              << "coll"
                                                              << "$id" << oid << "$db"
                                                              << "db"))));
    StatusWithMatchExpression result = MatchExpressionParser::parse(query);
    ASSERT_TRUE(result.isOK());
    std::unique_ptr<MatchExpression> destroy(result.getValue());

    OID oidx = OID::gen();
    ASSERT(!result.getValue()->matchesBSON(BSON("x" << BSON("$ref"
                                                            << "collx"
                                                            << "$id" << oidx << "$db"
                                                            << "db"))));
    ASSERT(!result.getValue()->matchesBSON(BSON("x" << BSON("$ref"
                                                            << "coll"
                                                            << "$id" << oidx << "$db"
                                                            << "db"))));
    ASSERT(!result.getValue()->matchesBSON(BSON("x" << BSON("$id" << oid << "$ref"
                                                                  << "coll"
                                                                  << "$db"
                                                                  << "db"))));
    ASSERT(!result.getValue()->matchesBSON(BSON("x" << BSON("$id" << oid << "$ref"
                                                                  << "coll"
                                                                  << "$db"
                                                                  << "db"))));
    ASSERT(!result.getValue()->matchesBSON(BSON("x" << BSON_ARRAY(BSON("$id" << oid << "$ref"
                                                                             << "coll"
                                                                             << "$db"
                                                                             << "db")))));
    ASSERT(!result.getValue()->matchesBSON(BSON("x" << BSON("$ref"
                                                            << "coll"
                                                            << "$id" << oid << "$db"
                                                            << "dbx"))));
    ASSERT(!result.getValue()->matchesBSON(BSON("x" << BSON("$db"
                                                            << "db"
                                                            << "$ref"
                                                            << "coll"
                                                            << "$id" << oid))));
    ASSERT(result.getValue()->matchesBSON(BSON("x" << BSON("$ref"
                                                           << "coll"
                                                           << "$id" << oid << "$db"
                                                           << "db"))));
    ASSERT(result.getValue()->matchesBSON(BSON("x" << BSON_ARRAY(BSON("$ref"
                                                                      << "coll"
                                                                      << "$id" << oid << "$db"
                                                                      << "db")))));
    ASSERT(result.getValue()->matchesBSON(BSON("x" << BSON_ARRAY(BSON("$ref"
                                                                      << "collx"
                                                                      << "$id" << oidx << "$db"
                                                                      << "db")
                                                                 << BSON("$ref"
                                                                         << "coll"
                                                                         << "$id" << oid << "$db"
                                                                         << "db")))));
}

TEST(MatchExpressionParserLeafTest, INMultipleDBRef) {
    OID oid = OID::gen();
    OID oidy = OID::gen();
    BSONObj query = BSON("x" << BSON("$in" << BSON_ARRAY(BSON("$ref"
                                                              << "colly"
                                                              << "$id" << oidy << "$db"
                                                              << "db")
                                                         << BSON("$ref"
                                                                 << "coll"
                                                                 << "$id" << oid << "$db"
                                                                 << "db"))));
    StatusWithMatchExpression result = MatchExpressionParser::parse(query);
    ASSERT_TRUE(result.isOK());
    std::unique_ptr<MatchExpression> destroy(result.getValue());

    OID oidx = OID::gen();
    ASSERT(!result.getValue()->matchesBSON(BSON("x" << BSON("$ref"
                                                            << "collx"
                                                            << "$id" << oidx << "$db"
                                                            << "db"))));
    ASSERT(!result.getValue()->matchesBSON(BSON("x" << BSON("$ref"
                                                            << "coll"
                                                            << "$id" << oidx << "$db"
                                                            << "db"))));
    ASSERT(!result.getValue()->matchesBSON(BSON("x" << BSON("$id" << oid << "$ref"
                                                                  << "coll"
                                                                  << "$db"
                                                                  << "db"))));
    ASSERT(!result.getValue()->matchesBSON(BSON("x" << BSON_ARRAY(BSON("$ref"
                                                                       << "coll"
                                                                       << "$id" << oidy << "$db"
                                                                       << "db")))));
    ASSERT(!result.getValue()->matchesBSON(BSON("x" << BSON_ARRAY(BSON("$ref"
                                                                       << "colly"
                                                                       << "$id" << oid << "$db"
                                                                       << "db")))));
    ASSERT(!result.getValue()->matchesBSON(BSON("x" << BSON_ARRAY(BSON("$id" << oid << "$ref"
                                                                             << "coll"
                                                                             << "$db"
                                                                             << "db")))));
    ASSERT(!result.getValue()->matchesBSON(BSON("x" << BSON_ARRAY(BSON("$ref"
                                                                       << "coll"
                                                                       << "$id" << oid << "$db"
                                                                       << "dbx")))));
    ASSERT(!result.getValue()->matchesBSON(BSON("x" << BSON_ARRAY(BSON("$id" << oidy << "$ref"
                                                                             << "colly"
                                                                             << "$db"
                                                                             << "db")))));
    ASSERT(!result.getValue()->matchesBSON(BSON("x" << BSON_ARRAY(BSON("$ref"
                                                                       << "collx"
                                                                       << "$id" << oidx << "$db"
                                                                       << "db")
                                                                  << BSON("$ref"
                                                                          << "coll"
                                                                          << "$id" << oidx << "$db"
                                                                          << "db")))));
    ASSERT(!result.getValue()->matchesBSON(BSON("x" << BSON_ARRAY(BSON("$ref"
                                                                       << "collx"
                                                                       << "$id" << oidx << "$db"
                                                                       << "db")
                                                                  << BSON("$ref"
                                                                          << "colly"
                                                                          << "$id" << oidx << "$db"
                                                                          << "db")))));
    ASSERT(!result.getValue()->matchesBSON(BSON("x" << BSON_ARRAY(BSON("$ref"
                                                                       << "collx"
                                                                       << "$id" << oidx << "$db"
                                                                       << "db")
                                                                  << BSON("$ref"
                                                                          << "coll"
                                                                          << "$id" << oid << "$db"
                                                                          << "dbx")))));
    ASSERT(result.getValue()->matchesBSON(BSON("x" << BSON("$ref"
                                                           << "coll"
                                                           << "$id" << oid << "$db"
                                                           << "db"))));
    ASSERT(result.getValue()->matchesBSON(BSON("x" << BSON("$ref"
                                                           << "colly"
                                                           << "$id" << oidy << "$db"
                                                           << "db"))));
    ASSERT(result.getValue()->matchesBSON(BSON("x" << BSON_ARRAY(BSON("$ref"
                                                                      << "coll"
                                                                      << "$id" << oid << "$db"
                                                                      << "db")))));
    ASSERT(result.getValue()->matchesBSON(BSON("x" << BSON_ARRAY(BSON("$ref"
                                                                      << "colly"
                                                                      << "$id" << oidy << "$db"
                                                                      << "db")))));
    ASSERT(result.getValue()->matchesBSON(BSON("x" << BSON_ARRAY(BSON("$ref"
                                                                      << "collx"
                                                                      << "$id" << oidx << "$db"
                                                                      << "db")
                                                                 << BSON("$ref"
                                                                         << "coll"
                                                                         << "$id" << oid << "$db"
                                                                         << "db")))));
    ASSERT(result.getValue()->matchesBSON(BSON("x" << BSON_ARRAY(BSON("$ref"
                                                                      << "collx"
                                                                      << "$id" << oidx << "$db"
                                                                      << "db")
                                                                 << BSON("$ref"
                                                                         << "colly"
                                                                         << "$id" << oidy << "$db"
                                                                         << "db")))));
}

TEST(MatchExpressionParserLeafTest, INDBRefWithOptionalField1) {
    OID oid = OID::gen();
    BSONObj query = BSON("x" << BSON("$in" << BSON_ARRAY(BSON("$ref"
                                                              << "coll"
                                                              << "$id" << oid << "foo" << 12345))));
    StatusWithMatchExpression result = MatchExpressionParser::parse(query);
    ASSERT_TRUE(result.isOK());
    std::unique_ptr<MatchExpression> destroy(result.getValue());

    OID oidx = OID::gen();
    ASSERT(!result.getValue()->matchesBSON(BSON("x" << BSON("$ref"
                                                            << "coll"
                                                            << "$id" << oidx << "$db"
                                                            << "db"))));
    ASSERT(result.getValue()->matchesBSON(
        BSON("x" << BSON_ARRAY(BSON("$ref"
                                    << "coll"
                                    << "$id" << oid << "foo" << 12345)))));
    ASSERT(result.getValue()->matchesBSON(
        BSON("x" << BSON_ARRAY(BSON("$ref"
                                    << "collx"
                                    << "$id" << oidx << "foo" << 12345)
                               << BSON("$ref"
                                       << "coll"
                                       << "$id" << oid << "foo" << 12345)))));
}

TEST(MatchExpressionParserLeafTest, INInvalidDBRefs) {
    // missing $id
    BSONObj query = BSON("x" << BSON("$in" << BSON_ARRAY(BSON("$ref"
                                                              << "coll"))));
    StatusWithMatchExpression result = MatchExpressionParser::parse(query);
    result = MatchExpressionParser::parse(query);

    // second field is not $id
    query = BSON("x" << BSON("$in" << BSON_ARRAY(BSON("$ref"
                                                      << "coll"
                                                      << "$foo" << 1))));
    result = MatchExpressionParser::parse(query);
    ASSERT_FALSE(result.isOK());

    OID oid = OID::gen();

    // missing $ref field
    query = BSON("x" << BSON("$in" << BSON_ARRAY(BSON("$id" << oid << "foo" << 3))));
    result = MatchExpressionParser::parse(query);
    ASSERT_FALSE(result.isOK());

    // missing $id and $ref field
    query = BSON("x" << BSON("$in" << BSON_ARRAY(BSON("$db"
                                                      << "test"
                                                      << "foo" << 3))));
    result = MatchExpressionParser::parse(query);
    ASSERT_FALSE(result.isOK());
}

TEST(MatchExpressionParserLeafTest, INExpressionDocument) {
    BSONObj query = BSON("x" << BSON("$in" << BSON_ARRAY(BSON("$foo" << 1))));
    StatusWithMatchExpression result = MatchExpressionParser::parse(query);
    ASSERT_FALSE(result.isOK());
}

TEST(MatchExpressionParserLeafTest, INNotArray) {
    BSONObj query = BSON("x" << BSON("$in" << 5));
    StatusWithMatchExpression result = MatchExpressionParser::parse(query);
    ASSERT_FALSE(result.isOK());
}

TEST(MatchExpressionParserLeafTest, INUndefined) {
    BSONObj query = BSON("x" << BSON("$in" << BSON_ARRAY(BSONUndefined)));
    StatusWithMatchExpression result = MatchExpressionParser::parse(query);
    ASSERT_FALSE(result.isOK());
}

TEST(MatchExpressionParserLeafTest, INNotElemMatch) {
    BSONObj query = BSON("x" << BSON("$in" << BSON_ARRAY(BSON("$elemMatch" << 1))));
    StatusWithMatchExpression result = MatchExpressionParser::parse(query);
    ASSERT_FALSE(result.isOK());
}

TEST(MatchExpressionParserLeafTest, INRegexTooLong) {
    string tooLargePattern(50 * 1000, 'z');
    BSONObjBuilder inArray;
    inArray.appendRegex("0", tooLargePattern, "");
    BSONObjBuilder operand;
    operand.appendArray("$in", inArray.obj());
    BSONObj query = BSON("x" << operand.obj());
    StatusWithMatchExpression result = MatchExpressionParser::parse(query);
    ASSERT_FALSE(result.isOK());
}

TEST(MatchExpressionParserLeafTest, INRegexTooLong2) {
    string tooLargePattern(50 * 1000, 'z');
    BSONObj query = BSON("x" << BSON("$in" << BSON_ARRAY(BSON("$regex" << tooLargePattern))));
    StatusWithMatchExpression result = MatchExpressionParser::parse(query);
    ASSERT_FALSE(result.isOK());
}

TEST(MatchExpressionParserLeafTest, INRegexStuff) {
    BSONObjBuilder inArray;
    inArray.appendRegex("0", "^a", "");
    inArray.appendRegex("1", "B", "i");
    inArray.append("2", 4);
    BSONObjBuilder operand;
    operand.appendArray("$in", inArray.obj());

    BSONObj query = BSON("a" << operand.obj());
    StatusWithMatchExpression result = MatchExpressionParser::parse(query);
    ASSERT_TRUE(result.isOK());
    std::unique_ptr<MatchExpression> destroy(result.getValue());

    BSONObj matchFirst = BSON("a"
                              << "ax");
    BSONObj matchFirstRegex = BSONObjBuilder().appendRegex("a", "^a", "").obj();
    BSONObj matchSecond = BSON("a"
                               << "qqb");
    BSONObj matchSecondRegex = BSONObjBuilder().appendRegex("a", "B", "i").obj();
    BSONObj matchThird = BSON("a" << 4);
    BSONObj notMatch = BSON("a"
                            << "l");
    BSONObj notMatchRegex = BSONObjBuilder().appendRegex("a", "B", "").obj();

    ASSERT(result.getValue()->matchesBSON(matchFirst));
    ASSERT(result.getValue()->matchesBSON(matchFirstRegex));
    ASSERT(result.getValue()->matchesBSON(matchSecond));
    ASSERT(result.getValue()->matchesBSON(matchSecondRegex));
    ASSERT(result.getValue()->matchesBSON(matchThird));
    ASSERT(!result.getValue()->matchesBSON(notMatch));
    ASSERT(!result.getValue()->matchesBSON(notMatchRegex));
}

TEST(MatchExpressionParserLeafTest, SimpleNIN1) {
    BSONObj query = BSON("x" << BSON("$nin" << BSON_ARRAY(2 << 3)));
    StatusWithMatchExpression result = MatchExpressionParser::parse(query);
    ASSERT_TRUE(result.isOK());
    std::unique_ptr<MatchExpression> destroy(result.getValue());

    ASSERT(result.getValue()->matchesBSON(BSON("x" << 1)));
    ASSERT(!result.getValue()->matchesBSON(BSON("x" << 2)));
    ASSERT(!result.getValue()->matchesBSON(BSON("x" << 3)));
}

TEST(MatchExpressionParserLeafTest, NINNotArray) {
    BSONObj query = BSON("x" << BSON("$nin" << 5));
    StatusWithMatchExpression result = MatchExpressionParser::parse(query);
    ASSERT_FALSE(result.isOK());
}


TEST(MatchExpressionParserLeafTest, Regex1) {
    BSONObjBuilder b;
    b.appendRegex("x", "abc", "i");
    BSONObj query = b.obj();
    StatusWithMatchExpression result = MatchExpressionParser::parse(query);
    ASSERT_TRUE(result.isOK());
    std::unique_ptr<MatchExpression> destroy(result.getValue());

    ASSERT(result.getValue()->matchesBSON(BSON("x"
                                               << "abc")));
    ASSERT(result.getValue()->matchesBSON(BSON("x"
                                               << "ABC")));
    ASSERT(!result.getValue()->matchesBSON(BSON("x"
                                                << "AC")));
}

TEST(MatchExpressionParserLeafTest, Regex2) {
    BSONObj query = BSON("x" << BSON("$regex"
                                     << "abc"
                                     << "$options"
                                     << "i"));
    StatusWithMatchExpression result = MatchExpressionParser::parse(query);
    ASSERT_TRUE(result.isOK());
    std::unique_ptr<MatchExpression> destroy(result.getValue());

    ASSERT(result.getValue()->matchesBSON(BSON("x"
                                               << "abc")));
    ASSERT(result.getValue()->matchesBSON(BSON("x"
                                               << "ABC")));
    ASSERT(!result.getValue()->matchesBSON(BSON("x"
                                                << "AC")));
}

TEST(MatchExpressionParserLeafTest, Regex3) {
    BSONObj query = BSON("x" << BSON("$options"
                                     << "i"
                                     << "$regex"
                                     << "abc"));
    StatusWithMatchExpression result = MatchExpressionParser::parse(query);
    log() << "result: " << result.getStatus() << endl;
    ASSERT_TRUE(result.isOK());
    std::unique_ptr<MatchExpression> destroy(result.getValue());

    ASSERT(result.getValue()->matchesBSON(BSON("x"
                                               << "abc")));
    ASSERT(result.getValue()->matchesBSON(BSON("x"
                                               << "ABC")));
    ASSERT(!result.getValue()->matchesBSON(BSON("x"
                                                << "AC")));
}


TEST(MatchExpressionParserLeafTest, RegexBad) {
    BSONObj query = BSON("x" << BSON("$regex"
                                     << "abc"
                                     << "$optionas"
                                     << "i"));
    StatusWithMatchExpression result = MatchExpressionParser::parse(query);
    ASSERT_FALSE(result.isOK());

    // $regex does not with numbers
    query = BSON("x" << BSON("$regex" << 123));
    result = MatchExpressionParser::parse(query);
    ASSERT_FALSE(result.isOK());

    query = BSON("x" << BSON("$regex" << BSON_ARRAY("abc")));
    result = MatchExpressionParser::parse(query);
    ASSERT_FALSE(result.isOK());

    query = BSON("x" << BSON("$optionas"
                             << "i"));
    result = MatchExpressionParser::parse(query);
    ASSERT_FALSE(result.isOK());

    query = BSON("x" << BSON("$options"
                             << "i"));
    result = MatchExpressionParser::parse(query);
    ASSERT_FALSE(result.isOK());
}

TEST(MatchExpressionParserLeafTest, ExistsYes1) {
    BSONObjBuilder b;
    b.appendBool("$exists", true);
    BSONObj query = BSON("x" << b.obj());
    StatusWithMatchExpression result = MatchExpressionParser::parse(query);
    ASSERT_TRUE(result.isOK());
    std::unique_ptr<MatchExpression> destroy(result.getValue());

    ASSERT(result.getValue()->matchesBSON(BSON("x"
                                               << "abc")));
    ASSERT(!result.getValue()->matchesBSON(BSON("y"
                                                << "AC")));
}

TEST(MatchExpressionParserLeafTest, ExistsNO1) {
    BSONObjBuilder b;
    b.appendBool("$exists", false);
    BSONObj query = BSON("x" << b.obj());
    StatusWithMatchExpression result = MatchExpressionParser::parse(query);
    ASSERT_TRUE(result.isOK());
    std::unique_ptr<MatchExpression> destroy(result.getValue());

    ASSERT(!result.getValue()->matchesBSON(BSON("x"
                                                << "abc")));
    ASSERT(result.getValue()->matchesBSON(BSON("y"
                                               << "AC")));
}

TEST(MatchExpressionParserLeafTest, Type1) {
    BSONObj query = BSON("x" << BSON("$type" << String));
    StatusWithMatchExpression result = MatchExpressionParser::parse(query);
    ASSERT_TRUE(result.isOK());
    std::unique_ptr<MatchExpression> destroy(result.getValue());

    ASSERT(result.getValue()->matchesBSON(BSON("x"
                                               << "abc")));
    ASSERT(!result.getValue()->matchesBSON(BSON("x" << 5)));
}

TEST(MatchExpressionParserLeafTest, Type2) {
    BSONObj query = BSON("x" << BSON("$type" << (double)NumberDouble));
    StatusWithMatchExpression result = MatchExpressionParser::parse(query);
    ASSERT_TRUE(result.isOK());
    std::unique_ptr<MatchExpression> destroy(result.getValue());

    ASSERT(result.getValue()->matchesBSON(BSON("x" << 5.3)));
    ASSERT(!result.getValue()->matchesBSON(BSON("x" << 5)));
}

TEST(MatchExpressionParserLeafTest, TypeDoubleOperator) {
    BSONObj query = BSON("x" << BSON("$type" << 1.5));
    StatusWithMatchExpression result = MatchExpressionParser::parse(query);
    ASSERT_TRUE(result.isOK());
    std::unique_ptr<MatchExpression> destroy(result.getValue());

    ASSERT(!result.getValue()->matchesBSON(BSON("x" << 5.3)));
    ASSERT(!result.getValue()->matchesBSON(BSON("x" << 5)));
}

TEST(MatchExpressionParserLeafTest, TypeNull) {
    BSONObj query = BSON("x" << BSON("$type" << jstNULL));
    StatusWithMatchExpression result = MatchExpressionParser::parse(query);
    ASSERT_TRUE(result.isOK());
    std::unique_ptr<MatchExpression> destroy(result.getValue());

    ASSERT(!result.getValue()->matchesBSON(BSONObj()));
    ASSERT(!result.getValue()->matchesBSON(BSON("x" << 5)));
    BSONObjBuilder b;
    b.appendNull("x");
    ASSERT(result.getValue()->matchesBSON(b.obj()));
}

TEST(MatchExpressionParserLeafTest, TypeBadType) {
    BSONObjBuilder b;
    b.append("$type", (JSTypeMax + 1));
    BSONObj query = BSON("x" << b.obj());
    StatusWithMatchExpression result = MatchExpressionParser::parse(query);
    ASSERT_TRUE(result.isOK());
    std::unique_ptr<MatchExpression> destroy(result.getValue());

    ASSERT(!result.getValue()->matchesBSON(BSON("x" << 5.3)));
    ASSERT(!result.getValue()->matchesBSON(BSON("x" << 5)));
}

TEST(MatchExpressionParserLeafTest, TypeBad) {
    BSONObj query = BSON("x" << BSON("$type" << BSON("x" << 1)));
    StatusWithMatchExpression result = MatchExpressionParser::parse(query);
    ASSERT_FALSE(result.isOK());
}
}