3

我正在使用 C# 开发从 Winforms RichTextBox 派生的代码编辑器。我已经实现了自动完成和语法高亮，但是代码折叠是一种不同的方法。我想要实现的是：

下面的代码：

public static SomeFunction(EventArgs e)
{
    //Some code
    //Some code
    //Some code
    //Some code
    //Some code
    //Some code
}

应该变成：

public static SomeFunction(EventArgs e)[...]

[...]当您将鼠标悬停在[...] 任何想法或建议如何使用正则表达式或程序代码时，工具提示中显示的缩短代码在哪里？

4

1 回答 1

1

我创建了一个解析器，它将返回代码折叠位置的索引。

  • 折叠分隔符由正则表达式定义。
  • 您可以指定开始和结束索引，以便在更新一个区域时不必检查整个代码。
  • 如果代码格式不正确，它将引发异常，请随意更改该行为。一种选择可能是它不断向上移动堆栈，直到找到适当的结束令牌。

折叠查找器

public class FoldFinder
{
    public static FoldFinder Instance { get; private set; }

    static FoldFinder()
    {
        Instance = new FoldFinder();
    }

    public List<SectionPosition> Find(string code, List<SectionDelimiter> delimiters, int start = 0,
        int end = -1)
    {
        List<SectionPosition> positions = new List<SectionPosition>();
        Stack<SectionStackItem> stack = new Stack<SectionStackItem>();

        int regexGroupIndex;
        bool isStartToken;
        SectionDelimiter matchedDelimiter;
        SectionStackItem currentItem;

        Regex scanner = RegexifyDelimiters(delimiters);

        foreach (Match match in scanner.Matches(code, start))
        {
            // the pattern for every group is that 0 corresponds to SectionDelimter, 1 corresponds to Start
            // and 2, corresponds to End.
            regexGroupIndex = 
                match.Groups.Cast<Group>().Select((g, i) => new {
                    Success = g.Success,
                    Index = i
                })
                .Where(r => r.Success && r.Index > 0).First().Index;

            matchedDelimiter = delimiters[(regexGroupIndex - 1) / 3];
            isStartToken = match.Groups[regexGroupIndex + 1].Success;

            if (isStartToken)
            {
                stack.Push(new SectionStackItem()
                {
                    Delimter = matchedDelimiter,
                    Position = new SectionPosition() { Start = match.Index }
                });
            }
            else
            {
                currentItem = stack.Pop();
                if (currentItem.Delimter == matchedDelimiter)
                {
                    currentItem.Position.End = match.Index + match.Length;
                    positions.Add(currentItem.Position);

                    // if searching for an end, and we've passed it, and the stack is empty then quit.
                    if (end > -1 && currentItem.Position.End >= end && stack.Count == 0) break;
                }
                else
                {
                    throw new Exception(string.Format("Invalid Ending Token at {0}", match.Index)); 
                }
            }
        }

        if (stack.Count > 0) throw new Exception("Not enough closing symbols.");

        return positions;
    }

    public Regex RegexifyDelimiters(List<SectionDelimiter> delimiters)
    {
        return new Regex(
            string.Join("|", delimiters.Select(d =>
                string.Format("(({0})|({1}))", d.Start, d.End))));
    }

}

public class SectionStackItem
{
    public SectionPosition Position;
    public SectionDelimiter Delimter;
}

public class SectionPosition
{
    public int Start;
    public int End;
}

public class SectionDelimiter
{
    public string Start;
    public string End;
}

样品查找

{,}下面的示例匹配由,和符号分隔的折叠[,]直到 a ;。我没有看到太多的 IDE 为每一行折叠，但它可能在很长的代码中很方便，比如 LINQ 查询。

var sectionPositions = 
    FoldFinder.Instance.Find("abc { def { qrt; ghi [ abc ] } qrt }", new List<SectionDelimiter>(
        new SectionDelimiter[3] {
            new SectionDelimiter() { Start = "\\{", End = "\\}" },
            new SectionDelimiter() { Start = "\\[", End = "\\]" },
            new SectionDelimiter() { Start = "(?<=\\[|\\{|;|^)[^[{;]*(?=;)", End = ";" },
        }));
于 2013-10-01T14:37:52.540 回答