解析VB6 code。在.NET [英] parsing VB6 code in .NET

问题描述

我已经写在C＃中的WPF项目，以获取有关外部依赖的一些信息，我需要解析VB6的脚本。该脚本的位置变化，其含量改变了一些，但主要code我感兴趣的将是格式为：

I have a WPF project written in C#, and in order to get some information about an external dependency, I need to parse a VB6 script. The script's location changes and its content changes some, but the main code I'm interested in will be of the format:

Select Case Fields("blah").Value
    Case "Some value"
        Fields("other blah").List = Lists("a list name")
    ...
End Select

我需要从这种提取物，当现场嗒嗒设置为某些价值，名单现场等嗒嗒的变化，列出清单名称。我试图谷歌搜索周围VB6的语法分析器写成一个.NET库，但没有发现任何东西。在得到像<一个答案的风险href="http://stackoverflow.com/questions/1732348/regex-match-open-tags-except-xhtml-self-contained-tags/1732454#1732454">this 之一，我应该只是使用普通的EX pressions找到这样的code在VB6脚本，并提取我需要的数据？在code是一个子程序，这样我可以不通过在胡说，一些价值，并取回等胡说，列表名称中。我已经在这个VB6脚本的内容没有控制权。

I need to extract from this that when field 'blah' is set to 'some value', the list for field 'other blah' changes to list 'a list name'. I tried Googling around for a VB6 parser written as a .NET library but haven't found anything yet. At the risk of getting an answer like this one, should I just use regular expressions to find the code like this in the VB6 script, and extract the data I need? The code is found in a subroutine such that I can't pass in 'blah', 'some value' and get back 'other blah', 'a list name'. I have no control over the contents of this VB6 script.

推荐答案

您可以通过几个步骤解析它。请注意，正则表达式错过字符串和注释，所以小心使用。

You can parse it in a few steps. Please note the regex misses strings and comments, so use with care.

首先，我们将使用一个辅助类的字段（目标）列出=列表（值）行：

First, we'll use a helper class for the Fields("Target").List = Lists("Value") lines:

class ListData
{
    public string Target { get; set; }
    public string Value { get; set; }
}

输出方式：

string patternSelectCase = @"
Select\s+Case\s+Fields\(""(?<CaseField>[\w\s]+)""\)\.Value
(?<Cases>.*?)
End\s+Select
";

string patternCase = @"
Case\s+""(?<Case>[\w\s]+)""\s+
(?:Fields\(""(?<Target>[\w\s]+)""\)\.List\s*=\s*Lists\(""(?<Value>[\w\s]+)""\)\s+)*
";

接下来，我们可以尝试分析文本，分两次（在code是有点丑，顺便说一下，但还算基本）：

Next, we can try to parse the text in two passes (the code is a little ugly, by the way, but fairly basic):

MatchCollection matches = Regex.Matches(vb, patternSelectCase,
        RegexOptions.IgnoreCase | RegexOptions.IgnorePatternWhitespace | 
        RegexOptions.Singleline);

Console.WriteLine(matches.Count);

var data = new Dictionary<String, Dictionary<String, List<ListData>>>();
foreach (Match match in matches)
{
    var caseData = new Dictionary<String, List<ListData>>();
    string caseField = match.Groups["CaseField"].Value;
    string cases = match.Groups["Cases"].Value;

    MatchCollection casesMatches = Regex.Matches(cases, patternCase,
             RegexOptions.IgnoreCase | RegexOptions.IgnorePatternWhitespace | 
             RegexOptions.Singleline);
    foreach (Match caseMatch in casesMatches)
    {
        string caseTitle = caseMatch.Groups["Case"].Value;
        var targetCaptures = caseMatch.Groups["Target"].Captures.Cast<Capture>();
        var valueCaptures = caseMatch.Groups["Value"].Captures.Cast<Capture>();
        caseData.Add(caseTitle, targetCaptures.Zip(valueCaptures, (t, v) =>
            new ListData
            {
                Target = t.Value,
                Value = v.Value
            }).ToList());
    }

    data.Add(caseField, caseData);
}

现在你有一个与所有的数据字典。例如：

Now you have a dictionary with all data. For example:

string s = data["foo"]["Some value2"].First().Value;

下面是一个工作的例子： https://gist.github.com/880148

Here's a working example: https://gist.github.com/880148

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