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Merge pull request #1469 from garethsb-sony/json_pointer-append

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Add operator/= and operator/ to construct a JSON pointer by appending two JSON pointers
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Niels Lohmann 2019-03-11 22:47:08 +01:00 • committed by GitHub
commit c983b67112
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4 changed files with 238 additions and 26 deletions
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92
test/src/unit-json_pointer.cpp
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@ -438,6 +438,7 @@ TEST_CASE("JSON pointers")
})
{
CHECK(json::json_pointer(ptr).to_string() == ptr);
CHECK(std::string(json::json_pointer(ptr)) == ptr);
}
}
@ -460,7 +461,79 @@ TEST_CASE("JSON pointers")
}
}
SECTION("push and pop")
SECTION("empty, push, pop and parent")
{
const json j =
{
{"", "Hello"},
{"pi", 3.141},
{"happy", true},
{"name", "Niels"},
{"nothing", nullptr},
{
"answer", {
{"everything", 42}
}
},
{"list", {1, 0, 2}},
{
"object", {
{"currency", "USD"},
{"value", 42.99},
{"", "empty string"},
{"/", "slash"},
{"~", "tilde"},
{"~1", "tilde1"}
}
}
};
// empty json_pointer returns the root JSON-object
auto ptr = ""_json_pointer;
CHECK(ptr.empty());
CHECK(j[ptr] == j);
// simple field access
ptr.push_back("pi");
CHECK(!ptr.empty());
CHECK(j[ptr] == j["pi"]);
ptr.pop_back();
CHECK(ptr.empty());
CHECK(j[ptr] == j);
// object and children access
const std::string answer("answer");
ptr.push_back(answer);
ptr.push_back("everything");
CHECK(!ptr.empty());
CHECK(j[ptr] == j["answer"]["everything"]);
ptr.pop_back();
ptr.pop_back();
CHECK(ptr.empty());
CHECK(j[ptr] == j);
// push key which has to be encoded
ptr.push_back("object");
ptr.push_back("/");
CHECK(j[ptr] == j["object"]["/"]);
CHECK(ptr.to_string() == "/object/~1");
CHECK(j[ptr.parent_pointer()] == j["object"]);
ptr = ptr.parent_pointer().parent_pointer();
CHECK(ptr.empty());
CHECK(j[ptr] == j);
// parent-pointer of the empty json_pointer is empty
ptr = ptr.parent_pointer();
CHECK(ptr.empty());
CHECK(j[ptr] == j);
CHECK_THROWS_WITH(ptr.pop_back(),
"[json.exception.out_of_range.405] JSON pointer has no parent");
}
SECTION("operators")
{
const json j =
{
@ -492,24 +565,31 @@ TEST_CASE("JSON pointers")
CHECK(j[ptr] == j);
// simple field access
ptr.push_back("pi");
ptr = ptr / "pi";
CHECK(j[ptr] == j["pi"]);
ptr.pop_back();
CHECK(j[ptr] == j);
// object and children access
ptr.push_back("answer");
ptr.push_back("everything");
const std::string answer("answer");
ptr /= answer;
ptr = ptr / "everything";
CHECK(j[ptr] == j["answer"]["everything"]);
ptr.pop_back();
ptr.pop_back();
CHECK(j[ptr] == j);
CHECK(ptr / ""_json_pointer == ptr);
CHECK(j["/answer"_json_pointer / "/everything"_json_pointer] == j["answer"]["everything"]);
// list children access
CHECK(j["/list"_json_pointer / 1] == j["list"][1]);
// push key which has to be encoded
ptr.push_back("object");
ptr.push_back("/");
ptr /= "object";
ptr = ptr / "/";
CHECK(j[ptr] == j["object"]["/"]);
CHECK(ptr.to_string() == "/object/~1");
}