从语言文件创建JSON对象

Question

我有一个看起来像这样的翻译文件：

#: this is just some comment
msgid ""
"this is a line.n"
"this is a newline.n"
"this is another newLine".
msgstr ""
"this can be filled in.n"
"or left blank."
#: just another comment
msgid "Pizza"
msgstr ""

您可以看到msgid可以是多行的或单键的。msgstr。

也是如此

我所有的翻译文件看起来都这样。我将如何使用上述数据示例创建一个包含两个键的JSON对象：

[
    {
        "msgid": "this is a line.nthis is a newline.nthis is another newLine.",
        "msgstr": "this can be filled in.n or left blank."
    },
    {
        "msgid": "Pizza",
        "msgstr": ""
    }
]

我可以访问我知道如何使用的JSON LIBARY。我正在努力通过数据循环（每个）循环循环。

目前我有此代码：

std::ifstream input(findFile("language.po"));
Json::Value jsonRoot = Json:arrayValue;
for( std::string line; getline( input, line ); )
{
    Json::Value Translation = Json::objectValue;
    if(line.find("msgid") == 0) {
        //messageId found
        Translation["msgid"] = line;
    } else if(line.find("msgstr") == 0) {
        //translated string was found
        Translation["msgstr"] = line;
    }
    jsonRoot.append(Translation);
}

但这为我不想要的每一行创建了一个新的JSON数组。

此刻，当前输出（未测试）应如下：

[
    {
        "msgid": ""
    },
    {
        "msgstr": ""
    },
    {
        "msgid": "Pizza"
    },
    {
        "msgstr": ""
    }
]

Answer 1

无论每行的内容如何，您的循环都将每行添加到数组中。您需要的是状态计算机，因此您只需将完整的对象添加到数组，您需要将持续行添加到以前的线上，直到到达下一个字段启动为止，并且您需要分析行以删除行前缀和报价。<<<<<<<<<<<<<<<<<<<<<<<<<</p>

尝试更多类似的东西：

std::ifstream input(findFile("language.po").string());
std::string msgid, msgstr;
std::string *field = NULL;
std::string::size_type start, end;
Json::Value jsonRoot = Json::arrayValue;
for( std::string line; std::getline( input, line ); )
{
    if (line.compare(0, 1, "#") == 0)
        continue;
    if (line.compare(0, 6, "msgid ") == 0)
    {
        if (!msgid.empty())
        {
            Json::Value Translation = Json::objectValue;
            Translation["msgid"] = msgid;
            Translation["msgstr"] = msgstr;
            jsonRoot.append(Translation);
        }
        msgid.clear();
        msgstr.clear();
        field = &msgid;
        start = 6;
    }
    else if (!field)
    {
        continue;
    }
    else if (line.compare(0, 7, "msgstr ") == 0)
    {
        field = &msgstr;
        start = 7;
    }
    else
    {
        start = 0;
    }
    start = line.find('"', start);
    if (start == std::string::npos)
        continue;
    ++start;
    end = line.find('"', start);
    if (end != std::string::npos)
        *field += line.substr(start, end-start);
    else
        *field += line.substr(start);
}
if (!msgid.empty())
{
    Json::Value Translation = Json::objectValue;
    Translation["msgid"] = msgid;
    Translation["msgstr"] = msgstr;
    jsonRoot.append(Translation);
}

Answer 2

我会写一台简单的状态计算机：

enum class State { INIT, ID, STR } state = State::INIT;
std::string buffer;
while (!end_of_file()) {
   auto s = get_next_line();
   if (is_comment(s)) {
      // do nothing
   } else if (is_msgid(s)) {
      if (state != State::STR) {
         buffer += s; // depending on how you read a line, you may have to add EOL here
      } else {
         put_msgid_into_json(buffer);
         buffer = s;
      }
      state = State::ID;
   } else if (is_msgstr(s)) {
      if (state != State::ID) {
         buffer += s; // depending on how you read a line, you may have to add EOL here
      } else {
         put_msgstr_into_json(buffer);
         buffer = s;
      }
      state = State::STR;
   }
}
if (state == State::ID) {
  put_msgid_into_json(buffer);
} else if (state == State::STR) {
  put_msgstr_into_json(buffer);
}