用什么替换巨大的 switch 语句? [英] Replace giant switch statement with what?
问题描述
我有一个解析一些模板文件的代码，当它找到一个占位符时，它会用一个值替换它.比如:
I have a code that parses some template files and when it finds a placeholder, it replaces it with a value. Something like:
<html>
<head>
<title>%title%</title>
</head>
<body bgcolor="%color%">
...etc.
在代码中，解析器找到这些，调用这个函数:
In code, the parser finds those, calls this function:
string getContent(const string& name)
{
if (name == "title")
return page->getTitle();
else if (name == "color")
return getBodyColor();
...etc.
}
然后用返回值替换原来的占位符.
and then replaces the original placeholder with returned value.
在实际情况下，它不是一个虚拟网页，并且可能出现许多 (50+) 个不同的占位符.
In real case, it is not a dummy web page, and there are many (50+) different placeholders that can occur.
我的代码是 C++，但我猜任何语言都存在这个问题.我猜这更多是关于算法和面向对象设计的.唯一重要的是它必须被编译，即使我想要我不能有任何动态/评估代码.
My code is C++, but I guess this problem exists with any language. It's more about algorithms and OO design I guess. Only important thing is that this must be compiled, even if I wanted I couldn't have any dynamic/eval'd code.
我虽然想实施责任链模式，但似乎不会对这种情况有太大改善.
I though about implementing Chain of Responsibility pattern, but it doesn't seem it would improve the situation much.
更新:我也担心 此评论在另一个线程中.我应该关心它吗?
UPDATE: and I'm also concerned about this comment in another thread. Should I care about it?
推荐答案
使用将标签名称映射到标签处理程序的字典.
Use a dictionary that maps tag names to a tag handler.
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