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ecbb2756fd
json/test/src/unit-json_pointer.cpp
Thomas Braun ecbb2756fd json_pointer::array_index: Use unsigned values for the array index when parsing 
The current code uses std::stoi to convert the input string to an int
array_index. This limits the maximum addressable array size to ~2GB on
most platforms.

But all callers immediately convert the result of array_index to
BasicJsonType::size_type.

So let's parse it as unsigned long long, which allows us to have as
big arrays as available memory. And also makes the call sites nicer to
read.

One complication arises on platforms where size_type is smaller than
unsigned long long. We need to bail out on these if the parsed array
index does not fit into size_type.
2020-06-22 13:42:55 +02:00

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/*
__ _____ _____ _____
__| | __| | | | JSON for Modern C++ (test suite)
| | |__ | | | | | | version 3.8.0
|_____|_____|_____|_|___| https://github.com/nlohmann/json
Licensed under the MIT License <http://opensource.org/licenses/MIT>.
SPDX-License-Identifier: MIT
Copyright (c) 2013-2019 Niels Lohmann <http://nlohmann.me>.
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 "doctest_compatibility.h"
#define private public
#include <nlohmann/json.hpp>
using nlohmann::json;
#undef private
TEST_CASE("JSON pointers")
{
SECTION("errors")
{
CHECK_THROWS_AS(json::json_pointer("foo"), json::parse_error&);
CHECK_THROWS_WITH(json::json_pointer("foo"),
"[json.exception.parse_error.107] parse error at byte 1: JSON pointer must be empty or begin with '/' - was: 'foo'");
CHECK_THROWS_AS(json::json_pointer("/~~"), json::parse_error&);
CHECK_THROWS_WITH(json::json_pointer("/~~"),
"[json.exception.parse_error.108] parse error: escape character '~' must be followed with '0' or '1'");
CHECK_THROWS_AS(json::json_pointer("/~"), json::parse_error&);
CHECK_THROWS_WITH(json::json_pointer("/~"),
"[json.exception.parse_error.108] parse error: escape character '~' must be followed with '0' or '1'");
json::json_pointer p;
CHECK_THROWS_AS(p.top(), json::out_of_range&);
CHECK_THROWS_WITH(p.top(),
"[json.exception.out_of_range.405] JSON pointer has no parent");
CHECK_THROWS_AS(p.pop_back(), json::out_of_range&);
CHECK_THROWS_WITH(p.pop_back(),
"[json.exception.out_of_range.405] JSON pointer has no parent");
SECTION("array index error")
{
json v = {1, 2, 3, 4};
json::json_pointer ptr("/10e");
CHECK_THROWS_AS(v[ptr], json::out_of_range&);
CHECK_THROWS_WITH(v[ptr],
"[json.exception.out_of_range.404] unresolved reference token '10e'");
}
}
SECTION("examples from RFC 6901")
{
SECTION("nonconst access")
{
json j = R"(
{
"foo": ["bar", "baz"],
"": 0,
"a/b": 1,
"c%d": 2,
"e^f": 3,
"g|h": 4,
"i\\j": 5,
"k\"l": 6,
" ": 7,
"m~n": 8
}
)"_json;
// the whole document
CHECK(j[json::json_pointer()] == j);
CHECK(j[json::json_pointer("")] == j);
CHECK(j.contains(json::json_pointer()));
CHECK(j.contains(json::json_pointer("")));
// array access
CHECK(j[json::json_pointer("/foo")] == j["foo"]);
CHECK(j.contains(json::json_pointer("/foo")));
CHECK(j[json::json_pointer("/foo/0")] == j["foo"][0]);
CHECK(j[json::json_pointer("/foo/1")] == j["foo"][1]);
CHECK(j["/foo/1"_json_pointer] == j["foo"][1]);
CHECK(j.contains(json::json_pointer("/foo/0")));
CHECK(j.contains(json::json_pointer("/foo/1")));
CHECK(not j.contains(json::json_pointer("/foo/3")));
CHECK(not j.contains(json::json_pointer("/foo/+")));
CHECK(not j.contains(json::json_pointer("/foo/1+2")));
CHECK(not j.contains(json::json_pointer("/foo/-")));
// checked array access
CHECK(j.at(json::json_pointer("/foo/0")) == j["foo"][0]);
CHECK(j.at(json::json_pointer("/foo/1")) == j["foo"][1]);
// empty string access
CHECK(j[json::json_pointer("/")] == j[""]);
CHECK(j.contains(json::json_pointer("")));
CHECK(j.contains(json::json_pointer("/")));
// other cases
CHECK(j[json::json_pointer("/ ")] == j[" "]);
CHECK(j[json::json_pointer("/c%d")] == j["c%d"]);
CHECK(j[json::json_pointer("/e^f")] == j["e^f"]);
CHECK(j[json::json_pointer("/g|h")] == j["g|h"]);
CHECK(j[json::json_pointer("/i\\j")] == j["i\\j"]);
CHECK(j[json::json_pointer("/k\"l")] == j["k\"l"]);
// contains
CHECK(j.contains(json::json_pointer("/ ")));
CHECK(j.contains(json::json_pointer("/c%d")));
CHECK(j.contains(json::json_pointer("/e^f")));
CHECK(j.contains(json::json_pointer("/g|h")));
CHECK(j.contains(json::json_pointer("/i\\j")));
CHECK(j.contains(json::json_pointer("/k\"l")));
// checked access
CHECK(j.at(json::json_pointer("/ ")) == j[" "]);
CHECK(j.at(json::json_pointer("/c%d")) == j["c%d"]);
CHECK(j.at(json::json_pointer("/e^f")) == j["e^f"]);
CHECK(j.at(json::json_pointer("/g|h")) == j["g|h"]);
CHECK(j.at(json::json_pointer("/i\\j")) == j["i\\j"]);
CHECK(j.at(json::json_pointer("/k\"l")) == j["k\"l"]);
// escaped access
CHECK(j[json::json_pointer("/a~1b")] == j["a/b"]);
CHECK(j[json::json_pointer("/m~0n")] == j["m~n"]);
CHECK(j.contains(json::json_pointer("/a~1b")));
CHECK(j.contains(json::json_pointer("/m~0n")));
// unescaped access
// access to nonexisting values yield object creation
CHECK(not j.contains(json::json_pointer("/a/b")));
CHECK_NOTHROW(j[json::json_pointer("/a/b")] = 42);
CHECK(j.contains(json::json_pointer("/a/b")));
CHECK(j["a"]["b"] == json(42));
CHECK(not j.contains(json::json_pointer("/a/c/1")));
CHECK_NOTHROW(j[json::json_pointer("/a/c/1")] = 42);
CHECK(j["a"]["c"] == json({nullptr, 42}));
CHECK(j.contains(json::json_pointer("/a/c/1")));
CHECK(not j.contains(json::json_pointer("/a/d/-")));
CHECK_NOTHROW(j[json::json_pointer("/a/d/-")] = 42);
CHECK(not j.contains(json::json_pointer("/a/d/-")));
CHECK(j["a"]["d"] == json::array({42}));
// "/a/b" works for JSON {"a": {"b": 42}}
CHECK(json({{"a", {{"b", 42}}}})[json::json_pointer("/a/b")] == json(42));
// unresolved access
json j_primitive = 1;
CHECK_THROWS_AS(j_primitive["/foo"_json_pointer], json::out_of_range&);
CHECK_THROWS_WITH(j_primitive["/foo"_json_pointer],
"[json.exception.out_of_range.404] unresolved reference token 'foo'");
CHECK_THROWS_AS(j_primitive.at("/foo"_json_pointer), json::out_of_range&);
CHECK_THROWS_WITH(j_primitive.at("/foo"_json_pointer),
"[json.exception.out_of_range.404] unresolved reference token 'foo'");
CHECK(not j_primitive.contains(json::json_pointer("/foo")));
}
SECTION("const access")
{
const json j = R"(
{
"foo": ["bar", "baz"],
"": 0,
"a/b": 1,
"c%d": 2,
"e^f": 3,
"g|h": 4,
"i\\j": 5,
"k\"l": 6,
" ": 7,
"m~n": 8
}
)"_json;
// the whole document
CHECK(j[json::json_pointer()] == j);
CHECK(j[json::json_pointer("")] == j);
// array access
CHECK(j[json::json_pointer("/foo")] == j["foo"]);
CHECK(j[json::json_pointer("/foo/0")] == j["foo"][0]);
CHECK(j[json::json_pointer("/foo/1")] == j["foo"][1]);
CHECK(j["/foo/1"_json_pointer] == j["foo"][1]);
// checked array access
CHECK(j.at(json::json_pointer("/foo/0")) == j["foo"][0]);
CHECK(j.at(json::json_pointer("/foo/1")) == j["foo"][1]);
// empty string access
CHECK(j[json::json_pointer("/")] == j[""]);
// other cases
CHECK(j[json::json_pointer("/ ")] == j[" "]);
CHECK(j[json::json_pointer("/c%d")] == j["c%d"]);
CHECK(j[json::json_pointer("/e^f")] == j["e^f"]);
CHECK(j[json::json_pointer("/g|h")] == j["g|h"]);
CHECK(j[json::json_pointer("/i\\j")] == j["i\\j"]);
CHECK(j[json::json_pointer("/k\"l")] == j["k\"l"]);
// checked access
CHECK(j.at(json::json_pointer("/ ")) == j[" "]);
CHECK(j.at(json::json_pointer("/c%d")) == j["c%d"]);
CHECK(j.at(json::json_pointer("/e^f")) == j["e^f"]);
CHECK(j.at(json::json_pointer("/g|h")) == j["g|h"]);
CHECK(j.at(json::json_pointer("/i\\j")) == j["i\\j"]);
CHECK(j.at(json::json_pointer("/k\"l")) == j["k\"l"]);
// escaped access
CHECK(j[json::json_pointer("/a~1b")] == j["a/b"]);
CHECK(j[json::json_pointer("/m~0n")] == j["m~n"]);
// unescaped access
CHECK_THROWS_AS(j.at(json::json_pointer("/a/b")), json::out_of_range&);
CHECK_THROWS_WITH(j.at(json::json_pointer("/a/b")),
"[json.exception.out_of_range.403] key 'a' not found");
// unresolved access
const json j_primitive = 1;
CHECK_THROWS_AS(j_primitive["/foo"_json_pointer], json::out_of_range&);
CHECK_THROWS_WITH(j_primitive["/foo"_json_pointer],
"[json.exception.out_of_range.404] unresolved reference token 'foo'");
CHECK_THROWS_AS(j_primitive.at("/foo"_json_pointer), json::out_of_range&);
CHECK_THROWS_WITH(j_primitive.at("/foo"_json_pointer),
"[json.exception.out_of_range.404] unresolved reference token 'foo'");
}
SECTION("user-defined string literal")
{
json j = R"(
{
"foo": ["bar", "baz"],
"": 0,
"a/b": 1,
"c%d": 2,
"e^f": 3,
"g|h": 4,
"i\\j": 5,
"k\"l": 6,
" ": 7,
"m~n": 8
}
)"_json;
// the whole document
CHECK(j[""_json_pointer] == j);
CHECK(j.contains(""_json_pointer));
// array access
CHECK(j["/foo"_json_pointer] == j["foo"]);
CHECK(j["/foo/0"_json_pointer] == j["foo"][0]);
CHECK(j["/foo/1"_json_pointer] == j["foo"][1]);
CHECK(j.contains("/foo"_json_pointer));
CHECK(j.contains("/foo/0"_json_pointer));
CHECK(j.contains("/foo/1"_json_pointer));
CHECK(not j.contains("/foo/-"_json_pointer));
}
}
SECTION("array access")
{
SECTION("nonconst access")
{
json j = {1, 2, 3};
const json j_const = j;
// check reading access
CHECK(j["/0"_json_pointer] == j[0]);
CHECK(j["/1"_json_pointer] == j[1]);
CHECK(j["/2"_json_pointer] == j[2]);
// assign to existing index
j["/1"_json_pointer] = 13;
CHECK(j[1] == json(13));
// assign to nonexisting index
j["/3"_json_pointer] = 33;
CHECK(j[3] == json(33));
// assign to nonexisting index (with gap)
j["/5"_json_pointer] = 55;
CHECK(j == json({1, 13, 3, 33, nullptr, 55}));
// error with leading 0
CHECK_THROWS_AS(j["/01"_json_pointer], json::parse_error&);
CHECK_THROWS_WITH(j["/01"_json_pointer],
"[json.exception.parse_error.106] parse error: array index '01' must not begin with '0'");
CHECK_THROWS_AS(j_const["/01"_json_pointer], json::parse_error&);
CHECK_THROWS_WITH(j_const["/01"_json_pointer],
"[json.exception.parse_error.106] parse error: array index '01' must not begin with '0'");
CHECK_THROWS_AS(j.at("/01"_json_pointer), json::parse_error&);
CHECK_THROWS_WITH(j.at("/01"_json_pointer),
"[json.exception.parse_error.106] parse error: array index '01' must not begin with '0'");
CHECK_THROWS_AS(j_const.at("/01"_json_pointer), json::parse_error&);
CHECK_THROWS_WITH(j_const.at("/01"_json_pointer),
"[json.exception.parse_error.106] parse error: array index '01' must not begin with '0'");
CHECK(not j.contains("/01"_json_pointer));
CHECK(not j.contains("/01"_json_pointer));
CHECK(not j_const.contains("/01"_json_pointer));
CHECK(not j_const.contains("/01"_json_pointer));
// error with incorrect numbers
CHECK_THROWS_AS(j["/one"_json_pointer] = 1, json::parse_error&);
CHECK_THROWS_WITH(j["/one"_json_pointer] = 1,
"[json.exception.parse_error.109] parse error: array index 'one' is not a number");
CHECK_THROWS_AS(j_const["/one"_json_pointer] == 1, json::parse_error&);
CHECK_THROWS_WITH(j_const["/one"_json_pointer] == 1,
"[json.exception.parse_error.109] parse error: array index 'one' is not a number");
CHECK_THROWS_AS(j.at("/one"_json_pointer) = 1, json::parse_error&);
CHECK_THROWS_WITH(j.at("/one"_json_pointer) = 1,
"[json.exception.parse_error.109] parse error: array index 'one' is not a number");
CHECK_THROWS_AS(j_const.at("/one"_json_pointer) == 1, json::parse_error&);
CHECK_THROWS_WITH(j_const.at("/one"_json_pointer) == 1,
"[json.exception.parse_error.109] parse error: array index 'one' is not a number");
CHECK_THROWS_AS(j["/+1"_json_pointer] = 1, json::parse_error&);
CHECK_THROWS_WITH(j["/+1"_json_pointer] = 1,
"[json.exception.parse_error.109] parse error: array index '+1' is not a number");
CHECK_THROWS_AS(j_const["/+1"_json_pointer] == 1, json::parse_error&);
CHECK_THROWS_WITH(j_const["/+1"_json_pointer] == 1,
"[json.exception.parse_error.109] parse error: array index '+1' is not a number");
CHECK_THROWS_AS(j["/1+1"_json_pointer] = 1, json::out_of_range&);
CHECK_THROWS_WITH(j["/1+1"_json_pointer] = 1,
"[json.exception.out_of_range.404] unresolved reference token '1+1'");
CHECK_THROWS_AS(j_const["/1+1"_json_pointer] == 1, json::out_of_range&);
CHECK_THROWS_WITH(j_const["/1+1"_json_pointer] == 1,
"[json.exception.out_of_range.404] unresolved reference token '1+1'");
{
auto too_large_index = std::to_string((std::numeric_limits<unsigned long long>::max)()) + "1";
json::json_pointer jp(std::string("/") + too_large_index);
std::string throw_msg = std::string("[json.exception.out_of_range.404] unresolved reference token '") + too_large_index + "'";
CHECK_THROWS_AS(j[jp] = 1, json::out_of_range&);
CHECK_THROWS_WITH(j[jp] = 1, throw_msg.c_str());
CHECK_THROWS_AS(j_const[jp] == 1, json::out_of_range&);
CHECK_THROWS_WITH(j_const[jp] == 1, throw_msg.c_str());
}
if (sizeof(typename json::size_type) < sizeof(unsigned long long))
{
auto size_type_max_uul = static_cast<unsigned long long>((std::numeric_limits<json::size_type>::max)());
auto too_large_index = std::to_string(size_type_max_uul);
json::json_pointer jp(std::string("/") + too_large_index);
std::string throw_msg = std::string("[json.exception.out_of_range.410] array index ") + too_large_index + " exceeds size_type";
CHECK_THROWS_AS(j[jp] = 1, json::out_of_range&);
CHECK_THROWS_WITH(j[jp] = 1, throw_msg.c_str());
CHECK_THROWS_AS(j_const[jp] == 1, json::out_of_range&);
CHECK_THROWS_WITH(j_const[jp] == 1, throw_msg.c_str());
}
CHECK_THROWS_AS(j.at("/one"_json_pointer) = 1, json::parse_error&);
CHECK_THROWS_WITH(j.at("/one"_json_pointer) = 1,
"[json.exception.parse_error.109] parse error: array index 'one' is not a number");
CHECK_THROWS_AS(j_const.at("/one"_json_pointer) == 1, json::parse_error&);
CHECK_THROWS_WITH(j_const.at("/one"_json_pointer) == 1,
"[json.exception.parse_error.109] parse error: array index 'one' is not a number");
CHECK(not j.contains("/one"_json_pointer));
CHECK(not j.contains("/one"_json_pointer));
CHECK(not j_const.contains("/one"_json_pointer));
CHECK(not j_const.contains("/one"_json_pointer));
CHECK_THROWS_AS(json({{"/list/0", 1}, {"/list/1", 2}, {"/list/three", 3}}).unflatten(), json::parse_error&);
CHECK_THROWS_WITH(json({{"/list/0", 1}, {"/list/1", 2}, {"/list/three", 3}}).unflatten(),
"[json.exception.parse_error.109] parse error: array index 'three' is not a number");
// assign to "-"
j["/-"_json_pointer] = 99;
CHECK(j == json({1, 13, 3, 33, nullptr, 55, 99}));
// error when using "-" in const object
CHECK_THROWS_AS(j_const["/-"_json_pointer], json::out_of_range&);
CHECK_THROWS_WITH(j_const["/-"_json_pointer],
"[json.exception.out_of_range.402] array index '-' (3) is out of range");
CHECK(not j_const.contains("/-"_json_pointer));
// error when using "-" with at
CHECK_THROWS_AS(j.at("/-"_json_pointer), json::out_of_range&);
CHECK_THROWS_WITH(j.at("/-"_json_pointer),
"[json.exception.out_of_range.402] array index '-' (7) is out of range");
CHECK_THROWS_AS(j_const.at("/-"_json_pointer), json::out_of_range&);
CHECK_THROWS_WITH(j_const.at("/-"_json_pointer),
"[json.exception.out_of_range.402] array index '-' (3) is out of range");
CHECK(not j_const.contains("/-"_json_pointer));
}
SECTION("const access")
{
const json j = {1, 2, 3};
// check reading access
CHECK(j["/0"_json_pointer] == j[0]);
CHECK(j["/1"_json_pointer] == j[1]);
CHECK(j["/2"_json_pointer] == j[2]);
// assign to nonexisting index
CHECK_THROWS_AS(j.at("/3"_json_pointer), json::out_of_range&);
CHECK_THROWS_WITH(j.at("/3"_json_pointer),
"[json.exception.out_of_range.401] array index 3 is out of range");
CHECK(not j.contains("/3"_json_pointer));
// assign to nonexisting index (with gap)
CHECK_THROWS_AS(j.at("/5"_json_pointer), json::out_of_range&);
CHECK_THROWS_WITH(j.at("/5"_json_pointer),
"[json.exception.out_of_range.401] array index 5 is out of range");
CHECK(not j.contains("/5"_json_pointer));
// assign to "-"
CHECK_THROWS_AS(j["/-"_json_pointer], json::out_of_range&);
CHECK_THROWS_WITH(j["/-"_json_pointer],
"[json.exception.out_of_range.402] array index '-' (3) is out of range");
CHECK_THROWS_AS(j.at("/-"_json_pointer), json::out_of_range&);
CHECK_THROWS_WITH(j.at("/-"_json_pointer),
"[json.exception.out_of_range.402] array index '-' (3) is out of range");
CHECK(not j.contains("/-"_json_pointer));
}
}
SECTION("flatten")
{
json j =
{
{"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"}
}
}
};
json j_flatten =
{
{"/pi", 3.141},
{"/happy", true},
{"/name", "Niels"},
{"/nothing", nullptr},
{"/answer/everything", 42},
{"/list/0", 1},
{"/list/1", 0},
{"/list/2", 2},
{"/object/currency", "USD"},
{"/object/value", 42.99},
{"/object/", "empty string"},
{"/object/~1", "slash"},
{"/object/~0", "tilde"},
{"/object/~01", "tilde1"}
};
// check if flattened result is as expected
CHECK(j.flatten() == j_flatten);
// check if unflattened result is as expected
CHECK(j_flatten.unflatten() == j);
// error for nonobjects
CHECK_THROWS_AS(json(1).unflatten(), json::type_error&);
CHECK_THROWS_WITH(json(1).unflatten(),
"[json.exception.type_error.314] only objects can be unflattened");
// error for nonprimitve values
CHECK_THROWS_AS(json({{"/1", {1, 2, 3}}}).unflatten(), json::type_error&);
CHECK_THROWS_WITH(json({{"/1", {1, 2, 3}}}).unflatten(),
"[json.exception.type_error.315] values in object must be primitive");
// error for conflicting values
json j_error = {{"", 42}, {"/foo", 17}};
CHECK_THROWS_AS(j_error.unflatten(), json::type_error&);
CHECK_THROWS_WITH(j_error.unflatten(),
"[json.exception.type_error.313] invalid value to unflatten");
// explicit roundtrip check
CHECK(j.flatten().unflatten() == j);
// roundtrip for primitive values
json j_null;
CHECK(j_null.flatten().unflatten() == j_null);
json j_number = 42;
CHECK(j_number.flatten().unflatten() == j_number);
json j_boolean = false;
CHECK(j_boolean.flatten().unflatten() == j_boolean);
json j_string = "foo";
CHECK(j_string.flatten().unflatten() == j_string);
// roundtrip for empty structured values (will be unflattened to null)
json j_array(json::value_t::array);
CHECK(j_array.flatten().unflatten() == json());
json j_object(json::value_t::object);
CHECK(j_object.flatten().unflatten() == json());
}
SECTION("string representation")
{
for (auto ptr :
{"", "/foo", "/foo/0", "/", "/a~1b", "/c%d", "/e^f", "/g|h", "/i\\j", "/k\"l", "/ ", "/m~0n"
})
{
CHECK(json::json_pointer(ptr).to_string() == ptr);
CHECK(std::string(json::json_pointer(ptr)) == ptr);
}
}
SECTION("conversion")
{
SECTION("array")
{
json j;
// all numbers -> array
j["/12"_json_pointer] = 0;
CHECK(j.is_array());
}
SECTION("object")
{
json j;
// contains a number, but is not a number -> object
j["/a12"_json_pointer] = 0;
CHECK(j.is_object());
}
}
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"]);
// check access via const pointer
const auto cptr = ptr;
CHECK(cptr.back() == "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 =
{
{"", "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(j[ptr] == j);
// simple field access
ptr = ptr / "pi";
CHECK(j[ptr] == j["pi"]);
ptr.pop_back();
CHECK(j[ptr] == j);
// object and children access
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 /= "object";
ptr = ptr / "/";
CHECK(j[ptr] == j["object"]["/"]);
CHECK(ptr.to_string() == "/object/~1");
}
}
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