模板引擎实现 [英] template engine implementation

问题描述

我目前正在建设这个小小的模板引擎。 它使用一个包含参数模板的字符串，而标签，价值观的字典，以填补在模板中。

I am currently building this small template engine. It takes a string containing the template in parameter, and a dictionary of "tags,values" to fill in the template.

在发动机，我不知道，这将是模板中的标签和那些不会的。

In the engine, I have no idea of the tags that will be in the template and the ones that won't.

我目前遍历（的foreach）在dictionnary，我解析字符串，我已经把一个字符串生成器，并通过其相应的值替换标记在模板中。

I am currently iterating (foreach) on the dictionnary, parsing my string that I have put in a string builder, and replacing the tags in the template by their corresponding value.

是否有这样做的更有效的/方便的方法？ 我知道这里的​​主要缺点是StringBuilder的解析每次完全是为每个标签，这是相当不错...

Is there a more efficient/convenient way of doing this? I know the main drawback here is that the stringbuilder is parsed everytime entirely for each tag, which is quite bad...

（我也检查，但不包括在样本中，我的模板不包含任何标记了这个过程后，他们都格式化以同样的方式：@@标签@@）

(I am also checking, though not included in the sample, after the process that my template does not contain any tag anymore. They are all formated in the same way: @@tag@@)

//Dictionary<string, string> tagsValueCorrespondence;
//string template;

StringBuilder outputBuilder = new StringBuilder(template);
foreach (string tag in tagsValueCorrespondence.Keys)
{
    outputBuilder.Replace(tag, tagsValueCorrespondence[tag]);
}

template = outputBuilder.ToString();

对策：

@Marc：

string template = "Some @@foobar@@ text in a @@bar@@ template";
StringDictionary data = new StringDictionary();
data.Add("foo", "value1");
data.Add("bar", "value2");
data.Add("foo2bar", "value3");

输出：的中值2模板某些文本

Output: "Some text in a value2 template"

代替的 的中值2模板有些@@ foobar的@@文

instead of: "Some @@foobar@@ text in a value2 template"

推荐答案

怎么样的正则表达式和MatchEvaluator？像这样：

How about a Regex and MatchEvaluator? Like so:

string template = "Some @@Foo@@ text in a @@Bar@@ template";
StringDictionary data = new StringDictionary();
data.Add("foo", "random");
data.Add("bar", "regex");
string result = Regex.Replace(template, @"@@([^@]+)@@", delegate(Match match)
{
    string key = match.Groups[1].Value;
    return data[key];
});

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