forked from robertmrk/jmespath.cpp
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathjmespath.cpp
More file actions
75 lines (70 loc) · 3 KB
/
jmespath.cpp
File metadata and controls
75 lines (70 loc) · 3 KB
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
/****************************************************************************
**
** Author: Róbert Márki <[email protected]>
** Copyright (c) 2016 Róbert Márki
**
** This file is part of the jmespath.cpp project which is distributed under
** the MIT License (MIT).
**
** Permission is hereby granted, free of charge, to any person obtaining a copy
** of this software and associated documentation files (the "Software"), to
** deal in the Software without restriction, including without limitation the
** rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
** sell copies of the Software, and to permit persons to whom the Software is
** furnished to do so, subject to the following conditions:
**
** The above copyright notice and this permission notice shall be included in
** all copies or substantial portions of the Software.
**
** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
** IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
** FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
** AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
** LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
** FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
** DEALINGS IN THE SOFTWARE.
**
****************************************************************************/
#include "jmespath/jmespath.h"
#include "src/interpreter/interpreter.h"
#include <boost/hana.hpp>
namespace jmespath {
template <typename JsonT>
std::enable_if_t<std::is_same<std::decay_t<JsonT>, Json>::value, Json>
search(const Expression &expression, JsonT&& document)
{
using interpreter::Interpreter;
using interpreter::JsonRef;
if (expression.isEmpty())
{
return {};
}
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wexit-time-destructors"
thread_local Interpreter s_interpreter;
#pragma clang diagnostic pop
s_interpreter.setContext(std::forward<JsonT>(document));
// evaluate the expression by calling visit with the root of the AST
s_interpreter.visit(expression.astRoot());
// copy the context value from the interpreter if it's a reference or move
// it into the local result variable if it's a value, and return the result
// of the function by value. this approach leaves open the possibility for
// the compiler to use copy elision to optimize away any further copies or
// moves
Json result;
auto visitor = boost::hana::overload(
[&result](const JsonRef& value) mutable {
result = value.get();
},
[&result](Json& value) mutable {
result = std::move(value);
}
);
boost::apply_visitor(visitor, s_interpreter.currentContextValue());
return result;
}
// explicit instantion
template Json search<const Json&>(const Expression&, const Json&);
template Json search<Json&>(const Expression&, Json&);
template Json search<Json>(const Expression&, Json&&);
} // namespace jmespath