public Parser(string filename)
{
AllRegex = new List <GitIgnoreRegex>();
var lines = File.ReadAllLines(filename);
foreach (var line in lines)
{
var reg = GitIgnoreRegex.Create(line);
if (reg != null)
{
AllRegex.Add(reg);
}
}
}
public static GitIgnoreRegex Create(string orig_line)
{
var line = orig_line.TrimEnd('\r');
// 以#开头的是注释
if (line.StartsWith("#"))
{
return(null);
}
line = line.Trim(' ');
if (line.Length == 0)
{
return(null);
}
bool negative = false;
if (line.StartsWith("!"))
{
negative = true;
}
// 以\#或者\!开头的，转化成以#或者!开头
if (Regex.IsMatch(line, @"^(\\#|\\!)"))
{
line = line.Substring(1);
}
// 对于foo/*.blah的，改成/foo/*.blah
if (!line.StartsWith("/") && Regex.IsMatch(line, @"([^\\/]+)/.*\*\."))
{
line = "/" + line;
}
// 把"."转义成"\."
line = Regex.Replace(line, @"\.", ".");
// 随意一个字符
string magicStar = "#$~";
if (line.Contains(magicStar))
{
throw new Exception("此行不合法：" + orig_line);
}
if (line.StartsWith("/**/"))
{
line = line.Substring(1);
}
// 把gitignore语法替换成C#识别的正则表达式
line = Regex.Replace(line, @"/\*\*/", @"(/|/.+/)");
line = Regex.Replace(line, @"\*\*/", @"(|." + magicStar + "/)");
line = Regex.Replace(line, @"/\*\*", @"(|/." + magicStar + ")");
line = Regex.Replace(line, @"\\\*", @"\" + magicStar);
line = Regex.Replace(line, @"\*", "([^/]*)");
line = line.Replace("?", @"\?");
line = line.Replace(magicStar, "*");
//
string expr = "";
if (line.EndsWith("/"))
{
expr = line + @"(|.*)$";
}
else
{
expr = line + @"(|/.*)$";
}
if (expr.StartsWith("/"))
{
expr = "^(|/)" + expr.Substring(1);
}
else
{
expr = "^(|.*/)" + expr;
}
GitIgnoreRegex ret = new GitIgnoreRegex();
ret.MyRegex = new Regex(expr);
ret.Negative = negative;
return(ret);
}