annotate json/json11/test.cpp @ 66:6f160dee1192

Instead of using separate values and b64values entries in JSON serialisations, allow numeric arrays to be replaced by b64 variants wherever they appear (discriminating by type). Also rename values to featureValues in feature throughout, as values turns out to be a hazardous name in a JS context. Finally use Array instead of Text for array encoding (seems clearer).

#include <string>
#include <cstdio>
#include <cstring>
#include <iostream>
#include <sstream>
#include "json11.hpp"
#include <cassert>
#include <list>
#include <set>
#include <unordered_map>

using namespace json11;
using std::string;

// Check that Json has the properties we want.
#include <type_traits>
#define CHECK_TRAIT(x) static_assert(std::x::value, #x)
CHECK_TRAIT(is_nothrow_constructible<Json>);
CHECK_TRAIT(is_nothrow_default_constructible<Json>);
CHECK_TRAIT(is_copy_constructible<Json>);
CHECK_TRAIT(is_nothrow_move_constructible<Json>);
CHECK_TRAIT(is_copy_assignable<Json>);
CHECK_TRAIT(is_nothrow_move_assignable<Json>);
CHECK_TRAIT(is_nothrow_destructible<Json>);

void parse_from_stdin() {
    string buf;
    string line;
    while (std::getline(std::cin, line)) {
        buf += line + "\n";
    }

    string err;
    auto json = Json::parse(buf, err);
    if (!err.empty()) {
        printf("Failed: %s\n", err.c_str());
    } else {
        printf("Result: %s\n", json.dump().c_str());
    }
}

int main(int argc, char **argv) {
    if (argc == 2 && argv[1] == string("--stdin")) {
        parse_from_stdin();
        return 0;
    }

    const string simple_test =
        R"({"k1":"v1", "k2":42, "k3":["a",123,true,false,null]})";

    string err;
    auto json = Json::parse(simple_test, err);

    std::cout << "k1: " << json["k1"].string_value() << "\n";
    std::cout << "k3: " << json["k3"].dump() << "\n";

    for (auto &k : json["k3"].array_items()) {
        std::cout << "    - " << k.dump() << "\n";
    }

    const string comment_test = R"({
      // comment /* with nested comment */
      "a": 1,
      // comment
      // continued
      "b": "text",
      /* multi
         line
         comment */
      // and single-line comment
      "c": [1, 2, 3]
    })";

    string err_comment;
    auto json_comment = Json::parse(
      comment_test, err_comment, JsonParse::COMMENTS);
    if (!err_comment.empty()) {
        printf("Failed: %s\n", err_comment.c_str());
    } else {
        printf("Result: %s\n", json_comment.dump().c_str());
    }

    string failing_comment_test = R"({
      /* bad comment
      "a": 1,
    })";

    string err_failing_comment;
    auto json_failing_comment = Json::parse(
      failing_comment_test, err_failing_comment, JsonParse::COMMENTS);
    if (!err_failing_comment.empty()) {
        printf("Failed: %s\n", err_failing_comment.c_str());
    } else {
        printf("Result: %s\n", json_failing_comment.dump().c_str());
    }

    failing_comment_test = R"({
      / / bad comment })";

    json_failing_comment = Json::parse(
      failing_comment_test, err_failing_comment, JsonParse::COMMENTS);
    if (!err_failing_comment.empty()) {
        printf("Failed: %s\n", err_failing_comment.c_str());
    } else {
        printf("Result: %s\n", json_failing_comment.dump().c_str());
    }

    failing_comment_test = R"({// bad comment })";

    json_failing_comment = Json::parse(
      failing_comment_test, err_failing_comment, JsonParse::COMMENTS);
    if (!err_failing_comment.empty()) {
        printf("Failed: %s\n", err_failing_comment.c_str());
    } else {
        printf("Result: %s\n", json_failing_comment.dump().c_str());
    }

    failing_comment_test = R"({
          "a": 1
        }/)";

    json_failing_comment = Json::parse(
      failing_comment_test, err_failing_comment, JsonParse::COMMENTS);
    if (!err_failing_comment.empty()) {
        printf("Failed: %s\n", err_failing_comment.c_str());
    } else {
        printf("Result: %s\n", json_failing_comment.dump().c_str());
    }

    failing_comment_test = R"({/* bad
                                  comment *})";

    json_failing_comment = Json::parse(
      failing_comment_test, err_failing_comment, JsonParse::COMMENTS);
    if (!err_failing_comment.empty()) {
        printf("Failed: %s\n", err_failing_comment.c_str());
    } else {
        printf("Result: %s\n", json_failing_comment.dump().c_str());
    }

    std::list<int> l1 { 1, 2, 3 };
    std::vector<int> l2 { 1, 2, 3 };
    std::set<int> l3 { 1, 2, 3 };
    assert(Json(l1) == Json(l2));
    assert(Json(l2) == Json(l3));

    std::map<string, string> m1 { { "k1", "v1" }, { "k2", "v2" } };
    std::unordered_map<string, string> m2 { { "k1", "v1" }, { "k2", "v2" } };
    assert(Json(m1) == Json(m2));

    // Json literals
    Json obj = Json::object({
        { "k1", "v1" },
        { "k2", 42.0 },
        { "k3", Json::array({ "a", 123.0, true, false, nullptr }) },
    });

    std::cout << "obj: " << obj.dump() << "\n";

    assert(Json("a").number_value() == 0);
    assert(Json("a").string_value() == "a");
    assert(Json().number_value() == 0);

    assert(obj == json);
    assert(Json(42) == Json(42.0));
    assert(Json(42) != Json(42.1));

    const string unicode_escape_test =
        R"([ "blah\ud83d\udca9blah\ud83dblah\udca9blah\u0000blah\u1234" ])";

    const char utf8[] = "blah" "\xf0\x9f\x92\xa9" "blah" "\xed\xa0\xbd" "blah"
                        "\xed\xb2\xa9" "blah" "\0" "blah" "\xe1\x88\xb4";

    Json uni = Json::parse(unicode_escape_test, err);
    assert(uni[0].string_value().size() == (sizeof utf8) - 1);
    assert(std::memcmp(uni[0].string_value().data(), utf8, sizeof utf8) == 0);

    // Demonstrates the behavior change in Xcode 7 / Clang 3.7 described
    // here: https://llvm.org/bugs/show_bug.cgi?id=23812
    Json nested_array = Json::array { Json::array { 1, 2, 3 } };
    assert(nested_array.is_array());
    assert(nested_array.array_items().size() == 1);
    assert(nested_array.array_items()[0].is_array());
    assert(nested_array.array_items()[0].array_items().size() == 3);

    Json my_json = Json::object {
        { "key1", "value1" },
        { "key2", false },
        { "key3", Json::array { 1, 2, 3 } },
    };
    std::string json_str = my_json.dump();
    printf("%s\n", json_str.c_str());

    class Point {
    public:
        int x;
        int y;
        Point (int x, int y) : x(x), y(y) {}
        Json to_json() const { return Json::array { x, y }; }
    };

    std::vector<Point> points = { { 1, 2 }, { 10, 20 }, { 100, 200 } };
    std::string points_json = Json(points).dump();
    printf("%s\n", points_json.c_str());
}