帮助改善此INI解析代码 [英] Help improve this INI parsing code

问题描述

这是我为创建的简单内容这个问题.我对此并不完全满意，我将其视为改善我对STL和基于流的编程的使用的机会.

This is something simple I came up with for this question. I'm not entirely happy with it and I saw it as a chance to help improve my use of STL and streams based programming.

std::wifstream file(L"\\Windows\\myini.ini");
if (file)
{
  bool section=false;
  while (!file.eof())
  {
    std::wstring line;
    std::getline(file, line);
    if (line.empty()) continue;

    switch (line[0])
    {
      // new header
      case L'[':
      {
        std::wstring header;
        size_t pos=line.find(L']');
        if (pos!=std::wstring::npos)
        {
          header=line.substr(1, pos);
          if (header==L"Section")
            section=true;
          else
            section=false;
        }
      }
  break;
      // comments
      case ';':
      case ' ':
      case '#':
      break;
      // var=value
      default:
      {
        if (!section) continue;

// what if the name = value does not have white space?
// what if the value is enclosed in quotes?
        std::wstring name, dummy, value;
        lineStm >> name >> dummy;
        ws(lineStm);
        WCHAR _value[256];
        lineStm.getline(_value, ELEMENTS(_value));
        value=_value;
      }
    }
  }
}

您将如何改善呢?请不要推荐其他库-我只想要一种简单的方法来从INI文件中解析出一些配置字符串.

How would you improve this? Please do not recommend alternative libraries - I just want a simple method for parsing out some config strings from an INI file.

推荐答案

//如果name = value没有空格怎么办?
//如果值用引号引起来怎么办?

// what if the name = value does not have white space?
// what if the value is enclosed in quotes?

我将使用boost :: regex来匹配每种不同类型的元素，例如:

I would use boost::regex to match for every different type of element, something like:

boost::smatch matches;
boost::regex name_value("(\S+)\s*=\s*(\S+)");
if(boost::regex_match(line, matches, name_value))
{
    name = matches[1];
    value = matches[2];
}

正则表达式可能需要进行一些调整.

the regular expressions might need some tweaking.

我还将用std :: getline替换de stream.getline，摆脱静态char数组.

I would also replace de stream.getline with std::getline, getting rid of the static char array.

这篇关于帮助改善此INI解析代码的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！