1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
|
/**
* Copyright (C) 2019-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* 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 Server Side 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/platform/basic.h"
#include <string>
#include <vector>
#include "mongo/base/string_data.h"
#include "mongo/bson/json.h"
#include "mongo/db/pipeline/aggregation_context_fixture.h"
#include "mongo/db/pipeline/expression.h"
#include "mongo/db/pipeline/expression_walker.h"
#include "mongo/unittest/unittest.h"
namespace mongo {
namespace {
class ExpressionWalkerTest : public AggregationContextFixture {
protected:
auto jsonToPipeline(StringData jsonArray) {
const auto inputBson = fromjson("{pipeline: " + jsonArray + "}");
ASSERT_EQUALS(inputBson["pipeline"].type(), BSONType::Array);
auto rawPipeline =
uassertStatusOK(AggregationRequest::parsePipelineFromBSON(inputBson["pipeline"]));
NamespaceString testNss("test", "collection");
AggregationRequest request(testNss, rawPipeline);
return Pipeline::parse(request.getPipeline(), getExpCtx());
}
auto parseExpression(std::string expressionString) {
return Expression::parseExpression(
getExpCtx(), fromjson(expressionString), getExpCtx()->variablesParseState);
}
};
using namespace std::string_literals;
using namespace expression_walker;
TEST_F(ExpressionWalkerTest, NullTreeWalkSucceeds) {
struct {
void preVisit(Expression*) {}
void inVisit(unsigned long long, Expression*) {}
void postVisit(Expression*) {}
} nothingWalker;
auto expression = boost::intrusive_ptr<Expression>();
walk(¬hingWalker, expression.get());
}
TEST_F(ExpressionWalkerTest, PrintWalkReflectsMutation) {
struct {
void preVisit(Expression* expression) {
if (typeid(*expression) == typeid(ExpressionConcat))
string += "{$concat: [";
if (auto constant = dynamic_cast<ExpressionConstant*>(expression))
string += "\""s + constant->getValue().getString() + "\"";
}
void inVisit(unsigned long long, Expression* expression) {
string += ", ";
}
void postVisit(Expression* expression) {
if (typeid(*expression) == typeid(ExpressionConcat))
string += "]}";
}
std::string string;
} stringWalker;
auto expressionString = "{$concat: [\"black\", \"green\", \"yellow\"]}"s;
auto expression = parseExpression(expressionString);
walk(&stringWalker, expression.get());
ASSERT_EQ(stringWalker.string, expressionString);
}
TEST_F(ExpressionWalkerTest, InVisitCanCount) {
struct {
void preVisit(Expression*) {}
void inVisit(unsigned long long count, Expression*) {
counter.push_back(count);
}
void postVisit(Expression*) {}
std::vector<unsigned long long> counter;
} countWalker;
auto expressionString = "{$and: [true, false, true, true, false, true]}"s;
auto expression = parseExpression(expressionString);
walk(&countWalker, expression.get());
ASSERT(countWalker.counter == std::vector({1ull, 2ull, 3ull, 4ull, 5ull}));
}
} // namespace
} // namespace mongo
|
