流式结构化文本输入
我想从 TextReader 解析格式化的基本值和一些自定义字符串 - 本质上就像 scanf 允许的那样。
- 我的输入可能没有换行符，因此 ReadLine+Regex 不是一个选项。我可以使用其他方式对文本输入进行分块；但问题是我在编译时不知道分隔符（所以这很棘手），并且该分隔符可能与本地化相关。例如，后跟逗号的浮点数可能是“1.5”或“1,5”，但在这两种情况下尝试解析浮点数都应该是“贪婪的”。
- 为了安全起见，我想假设我的输入是积极敌对的（例如，从网络流流入）：即故意缺少分块分隔符。
- 我想避免自定义正则表达式：int.Parse 和 double.Parse 工作良好并且具有本地化意识。不要让我开始使用 DateTime - 无论如何，我可能需要一些自定义模式，但编写正则表达式来覆盖该场景听起来并不有趣。
举一个具体的例子，假设我有一个 TextReader 并且我知道下一个值应该是 double - 我如何提取该 double 以及可能有限数量的前瞻无需读取整个流，也无需手动编写可本地化的双解析器？
类似的问题
有一个上一个问题“寻找与 scanf 等效的 C# ”听起来很相似，但问答集中在 readline+regex （我想避免）。 如何对 TextReader 使用正则表达式？ 没有找到答案（除了分块之外），无论如何我都想避免编写自己的正则表达式。
I'd like to parse formatted basic values and a few custom strings from a TextReader - essentially like scanf allows.
- My input might not have line-breaks, so ReadLine+Regex isn't an option. I could use some other way of chunking text input; but the problem is that I don't know the delimiter at compile time (so that's tricky), and that that delimiter might be localization-dependant. For instance, a float followed by a comma might be "1.5," or "1,5," but in both cases attempting to parse the float should be "greedy".
- To be safe, I'd like to assume my input is actively hostile (say, streaming in from a network stream): i.e. intentionally missing chunking delimiters.
- I'd like to avoid custom Regex's: int.Parse and double.Parse work well and are localization-aware. Don't get me started on DateTime's - I might need a few custom patterns anyhow, but writing Regexes to cover that scenario doesn't sound like fun.
For a concrete example, let's say I have a TextReader and that I know the next value should be a double - how can I extract that double and possibly a limited amount of lookahead without reading the entire stream and without manually writing a localizable double-parser?
Similar Questions
There's a previous question "Looking for C# equivalent of scanf" which sounds similar but the Q+A focus on readline+regex (which I'd like to avoid). How can I use Regex against a TextReader? didn't find an answer (beyond chunking), and in any case I'd like to avoid writing my own Regexes.
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基于缺乏答案并且我自己仍然没有找到任何东西，似乎
Based on that lack of answers and still not having found anything myself, it seems that