json_handler.cc
3.33 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
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
121
122
123
124
125
126
127
128
#include <qpdf/JSONHandler.hh>
#include <qpdf/QUtil.hh>
#include <iostream>
#include <cassert>
static void print_null(std::string const& path)
{
std::cout << path << ": null" << std::endl;
}
static void print_string(std::string const& path, std::string const& value)
{
std::cout << path << ": string: " << value << std::endl;
}
static void print_number(std::string const& path, std::string const& value)
{
std::cout << path << ": number: " << value << std::endl;
}
static void print_bool(std::string const& path, bool value)
{
std::cout << path << ": bool: " << (value ? "true" : "false") << std::endl;
}
static void print_json(std::string const& path, JSON value)
{
std::cout << path << ": json: " << value.unparse() << std::endl;
}
static void test_scalar()
{
std::cout << "-- scalar --" << std::endl;
JSONHandler h;
h.addStringHandler(print_string);
JSON j = JSON::parse("\"potato\"");
h.handle(".", j);
}
static std::shared_ptr<JSONHandler> make_all_handler()
{
auto h = std::make_shared<JSONHandler>();
auto& m = h->addDictHandlers();
auto h1 = std::make_shared<JSONHandler>();
h1->addStringHandler(print_string);
m["one"] = h1;
auto h2 = std::make_shared<JSONHandler>();
h2->addNumberHandler(print_number);
m["two"] = h2;
auto h3 = std::make_shared<JSONHandler>();
h3->addBoolHandler(print_bool);
m["three"] = h3;
auto h4 = std::make_shared<JSONHandler>();
h4->addAnyHandler(print_json);
m["four"] = h4;
m["phour"] = h4; // share h4
auto h5 = std::make_shared<JSONHandler>();
// Allow to be either string or bool
h5->addBoolHandler(print_bool);
h5->addStringHandler(print_string);
h5->addNullHandler(print_null);
auto h5s = std::make_shared<JSONHandler>();
m["five"] = h5s;
h5s->addArrayHandler(h5);
auto h6 = std::make_shared<JSONHandler>();
auto& m6 = h6->addDictHandlers();
auto h6a = std::make_shared<JSONHandler>();
m6["a"] = h6a;
auto& m6a = h6a->addDictHandlers();
auto h6ab = std::make_shared<JSONHandler>();
m6a["b"] = h6ab;
auto h6ax = std::make_shared<JSONHandler>();
h6ax->addAnyHandler(print_json);
h6a->addFallbackDictHandler(h6ax);
m6["b"] = h6ab; // share
h6ab->addStringHandler(print_string);
m["six"] = h6;
return h;
}
static void test_all()
{
std::cout << "-- all --" << std::endl;
auto h = make_all_handler();
JSON j = JSON::parse(R"({
"one": "potato",
"two": 3.14,
"three": true,
"four": ["a", 1],
"five": ["x", false, "y", null, true],
"phour": null,
"six": {"a": {"b": "quack", "Q": "baaa"}, "b": "moo"}
})");
h->handle(".", j);
}
static void test_errors()
{
std::cout << "-- errors --" << std::endl;
auto h = make_all_handler();
auto t = [h](std::string const& msg, std::function<void()> fn) {
try
{
fn();
assert(false);
}
catch (JSONHandler::Error& e)
{
std::cout << msg << ": " << e.what() << std::endl;
}
};
t("bad type at top", [&h](){
h->handle(".", JSON::makeString("oops"));
});
t("unexpected key", [&h](){
JSON j = JSON::parse(R"({"x": "y"})");
h->handle(".", j);
});
}
int main(int argc, char* argv[])
{
test_scalar();
test_all();
test_errors();
return 0;
}