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unit-alt-string.cpp
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370 lines (308 loc) · 9.62 KB
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// __ _____ _____ _____
// __| | __| | | | JSON for Modern C++ (supporting code)
// | | |__ | | | | | | version 3.12.0
// |_____|_____|_____|_|___| https://github.com/nlohmann/json
//
// SPDX-FileCopyrightText: 2013-2026 Niels Lohmann <https://nlohmann.me>
// SPDX-FileCopyrightText: 2018 Vitaliy Manushkin <agri@akamo.info>
// SPDX-License-Identifier: MIT
#include "doctest_compatibility.h"
#include <nlohmann/json.hpp>
#include <string>
#include <utility>
/* forward declarations */
class alt_string;
bool operator<(const char* op1, const alt_string& op2) noexcept; // NOLINT(misc-use-internal-linkage)
void int_to_string(alt_string& target, std::size_t value); // NOLINT(misc-use-internal-linkage)
/*
* This is virtually a string class.
* It covers std::string under the hood.
*/
class alt_string
{
public:
using value_type = std::string::value_type;
static constexpr auto npos = (std::numeric_limits<std::size_t>::max)();
alt_string(const char* str): str_impl(str) {}
alt_string(const char* str, std::size_t count): str_impl(str, count) {}
alt_string(size_t count, char chr): str_impl(count, chr) {}
alt_string() = default;
alt_string& append(char ch)
{
str_impl.push_back(ch);
return *this;
}
alt_string& append(const alt_string& str)
{
str_impl.append(str.str_impl);
return *this;
}
alt_string& append(const char* s, std::size_t length)
{
str_impl.append(s, length);
return *this;
}
void push_back(char c)
{
str_impl.push_back(c);
}
template <typename op_type>
bool operator==(const op_type& op) const
{
return str_impl == op;
}
bool operator==(const alt_string& op) const
{
return str_impl == op.str_impl;
}
template <typename op_type>
bool operator!=(const op_type& op) const
{
return str_impl != op;
}
bool operator!=(const alt_string& op) const
{
return str_impl != op.str_impl;
}
std::size_t size() const noexcept
{
return str_impl.size();
}
void resize (std::size_t n)
{
str_impl.resize(n);
}
void resize (std::size_t n, char c)
{
str_impl.resize(n, c);
}
template <typename op_type>
bool operator<(const op_type& op) const noexcept
{
return str_impl < op;
}
bool operator<(const alt_string& op) const noexcept
{
return str_impl < op.str_impl;
}
const char* c_str() const
{
return str_impl.c_str();
}
char& operator[](std::size_t index)
{
return str_impl[index];
}
const char& operator[](std::size_t index) const
{
return str_impl[index];
}
char& back()
{
return str_impl.back();
}
const char& back() const
{
return str_impl.back();
}
void clear()
{
str_impl.clear();
}
const value_type* data() const
{
return str_impl.data();
}
bool empty() const
{
return str_impl.empty();
}
std::size_t find(const alt_string& str, std::size_t pos = 0) const
{
return str_impl.find(str.str_impl, pos);
}
std::size_t find_first_of(char c, std::size_t pos = 0) const
{
return str_impl.find_first_of(c, pos);
}
alt_string substr(std::size_t pos = 0, std::size_t count = npos) const
{
const std::string s = str_impl.substr(pos, count);
return {s.data(), s.size()};
}
alt_string& replace(std::size_t pos, std::size_t count, const alt_string& str)
{
str_impl.replace(pos, count, str.str_impl);
return *this;
}
void reserve( std::size_t new_cap = 0 )
{
str_impl.reserve(new_cap);
}
private:
std::string str_impl {}; // NOLINT(readability-redundant-member-init)
friend bool operator<(const char* /*op1*/, const alt_string& /*op2*/) noexcept;
};
void int_to_string(alt_string& target, std::size_t value)
{
target = std::to_string(value).c_str();
}
using alt_json = nlohmann::basic_json <
std::map,
std::vector,
alt_string,
bool,
std::int64_t,
std::uint64_t,
double,
std::allocator,
nlohmann::adl_serializer >;
bool operator<(const char* op1, const alt_string& op2) noexcept
{
return op1 < op2.str_impl;
}
TEST_CASE("alternative string type")
{
SECTION("dump")
{
{
alt_json doc;
doc["pi"] = 3.141;
const alt_string dump = doc.dump();
CHECK(dump == R"({"pi":3.141})");
}
{
alt_json doc;
doc["happy"] = true;
const alt_string dump = doc.dump();
CHECK(dump == R"({"happy":true})");
}
{
alt_json doc;
doc["name"] = "I'm Batman";
const alt_string dump = doc.dump();
CHECK(dump == R"({"name":"I'm Batman"})");
}
{
alt_json doc;
doc["nothing"] = nullptr;
const alt_string dump = doc.dump();
CHECK(dump == R"({"nothing":null})");
}
{
alt_json doc;
doc["answer"]["everything"] = 42;
const alt_string dump = doc.dump();
CHECK(dump == R"({"answer":{"everything":42}})");
}
{
alt_json doc;
doc["list"] = { 1, 0, 2 };
const alt_string dump = doc.dump();
CHECK(dump == R"({"list":[1,0,2]})");
}
{
alt_json doc;
doc["object"] = { {"currency", "USD"}, {"value", 42.99} };
const alt_string dump = doc.dump();
CHECK(dump == R"({"object":{"currency":"USD","value":42.99}})");
}
}
SECTION("parse")
{
auto doc = alt_json::parse(R"({"foo": "bar"})");
const alt_string dump = doc.dump();
CHECK(dump == R"({"foo":"bar"})");
}
SECTION("items")
{
auto doc = alt_json::parse(R"({"foo": "bar"})");
for (const auto& item : doc.items())
{
CHECK(item.key() == "foo");
CHECK(item.value() == "bar");
}
auto doc_array = alt_json::parse(R"(["foo", "bar"])");
for (const auto& item : doc_array.items())
{
if (item.key() == "0" )
{
CHECK( item.value() == "foo" );
}
else if (item.key() == "1" )
{
CHECK(item.value() == "bar");
}
else
{
CHECK(false);
}
}
}
SECTION("equality")
{
alt_json doc;
doc["Who are you?"] = "I'm Batman";
CHECK("I'm Batman" == doc["Who are you?"]);
CHECK(doc["Who are you?"] == "I'm Batman");
CHECK_FALSE("I'm Batman" != doc["Who are you?"]);
CHECK_FALSE(doc["Who are you?"] != "I'm Batman");
CHECK("I'm Bruce Wayne" != doc["Who are you?"]);
CHECK(doc["Who are you?"] != "I'm Bruce Wayne");
CHECK_FALSE("I'm Bruce Wayne" == doc["Who are you?"]);
CHECK_FALSE(doc["Who are you?"] == "I'm Bruce Wayne");
{
const alt_json& const_doc = doc;
CHECK("I'm Batman" == const_doc["Who are you?"]);
CHECK(const_doc["Who are you?"] == "I'm Batman");
CHECK_FALSE("I'm Batman" != const_doc["Who are you?"]);
CHECK_FALSE(const_doc["Who are you?"] != "I'm Batman");
CHECK("I'm Bruce Wayne" != const_doc["Who are you?"]);
CHECK(const_doc["Who are you?"] != "I'm Bruce Wayne");
CHECK_FALSE("I'm Bruce Wayne" == const_doc["Who are you?"]);
CHECK_FALSE(const_doc["Who are you?"] == "I'm Bruce Wayne");
}
}
SECTION("JSON pointer")
{
// conversion from json to alt_json fails to compile (see #3425);
// attempted fix(*) produces: [[['b','a','r'],['b','a','z']]] (with each char being an integer)
// (*) disable implicit conversion for json_refs of any basic_json type
// alt_json j = R"(
// {
// "foo": ["bar", "baz"]
// }
// )"_json;
auto j = alt_json::parse(R"({"foo": ["bar", "baz"]})");
CHECK(j.at(alt_json::json_pointer("/foo/0")) == j["foo"][0]);
CHECK(j.at(alt_json::json_pointer("/foo/1")) == j["foo"][1]);
}
SECTION("patch")
{
alt_json const patch1 = alt_json::parse(R"([{ "op": "add", "path": "/a/b", "value": [ "foo", "bar" ] }])");
alt_json const doc1 = alt_json::parse(R"({ "a": { "foo": 1 } })");
CHECK_NOTHROW(doc1.patch(patch1));
alt_json doc1_ans = alt_json::parse(R"(
{
"a": {
"foo": 1,
"b": [ "foo", "bar" ]
}
}
)");
CHECK(doc1.patch(patch1) == doc1_ans);
}
SECTION("diff")
{
alt_json const j1 = {"foo", "bar", "baz"};
alt_json const j2 = {"foo", "bam"};
CHECK(alt_json::diff(j1, j2).dump() == "[{\"op\":\"replace\",\"path\":\"/1\",\"value\":\"bam\"},{\"op\":\"remove\",\"path\":\"/2\"}]");
}
SECTION("flatten")
{
// a JSON value
const alt_json j = alt_json::parse(R"({"foo": ["bar", "baz"]})");
const auto j2 = j.flatten();
CHECK(j2.dump() == R"({"/foo/0":"bar","/foo/1":"baz"})");
}
}