/// <summary>
/// 匹配Host
/// </summary>
/// <param name="route">路由条目</param>
/// <param name="request">请求</param>
private static void BindHostParameters(Route route, Request request)
{
MatchToKeys(route, request, route.Compiled.HostRegex.Match(request.RouteUri.Host));
}
/// <summary>
/// 编译参数
/// </summary>
/// <param name="route">路由条目</param>
/// <param name="uri">uri</param>
/// <param name="isHost">是否是host</param>
/// <returns>编译数据</returns>
private static Hashtable CompilePattern(Route route, string uri, bool isHost)
{
int[] parametersIndex = null;
var defaultSeparator = isHost ? "." : "/";
//可选参数
var optionalParameters = new List <string>(MatchParameters(route.Uri.FullPath, @"\{(\w+?)\?\}", ref parametersIndex));
//所有参数
var parameters = MatchParameters(uri, @"\{(\w+?)\}", ref parametersIndex);
//已经被使用的变量名
var variables = new List <string>();
var tokens = new List <string[]>();
var pos = 0;
string varName, precedingText, precedingChar, where, followingPattern, nextSeparator;
bool isSeparator;
for (var i = 0; i < parameters.Length; i++)
{
varName = parameters[i];
// 获取当前匹配的变量之前的静态文本
precedingText = uri.Substring(pos, parametersIndex[i] - pos);
pos = parametersIndex[i] + parameters[i].Length + 2;
precedingChar = precedingText.Length <= 0 ? string.Empty : precedingText.Substring(precedingText.Length - 1);
isSeparator = string.Empty != precedingChar && SEPARATORS.Contains(precedingChar);
if (IsMatch(@"^\d", varName))
{
throw new DomainException(string.Format("variable name {0} cannot start with a digit in route pattern {1}. please use a different name.", varName, uri));
}
if (variables.Contains(varName))
{
throw new DomainException(string.Format("route pattern {0} cannot reference variable name {1} more than once.", varName, uri));
}
if (varName.Length > VARIABLE_MAXIMUM_LENGTH)
{
throw new DomainException(string.Format("variable name {0} cannot be longer than {1} characters in route pattern {2}. please use a shorter name.", varName, VARIABLE_MAXIMUM_LENGTH, uri));
}
if (isSeparator && precedingText != precedingChar)
{
tokens.Add(new[] { "text", precedingText.Substring(0, precedingText.Length - precedingChar.Length) });
}
else if (!isSeparator && precedingText.Length > 0)
{
tokens.Add(new[] { "text", precedingText });
}
//获取where的约束条件
where = route.GetWhere(varName);
if (where == null)
{
//获取之后的内容
followingPattern = uri.Substring(pos);
//下一个分隔符
nextSeparator = FindNextSeparator(followingPattern);
where = string.Format(
"[^{0}{1}]+",
RegexQuote(defaultSeparator),
defaultSeparator != nextSeparator && nextSeparator != string.Empty ? RegexQuote(nextSeparator) : string.Empty
);
}
tokens.Add(new[] { "variable", isSeparator ? precedingChar : string.Empty, where, varName });
variables.Add(varName);
}
//如果不是全部内容则追加入后续内容
if (pos < uri.Length)
{
tokens.Add(new[] { "text", uri.Substring(pos) });
}
var firstOptional = int.MaxValue;
if (!isHost)
{
string[] token;
for (var i = tokens.Count - 1; i >= 0; --i)
{
token = tokens[i];
if ("variable" == token[0] && optionalParameters.Contains(token[3]))
{
firstOptional = i;
}
else
{
break;
}
}
}
//计算并生成最终的表达式
var regexp = string.Empty;
for (int i = 0, nbToken = tokens.Count; i < nbToken; ++i)
{
regexp += ComputeRegexp(tokens, i, firstOptional);
}
regexp = '^' + regexp + "$";
var hash = new Hashtable
{
{ "staticPrefix", "text" == tokens[0][0] ? tokens[0][1] : string.Empty },
{ "regex", regexp },
{ "variables", variables.ToArray() }
};
tokens.Reverse();
hash.Add("tokens", tokens.ToArray());
return(hash);
}
/// <summary>
/// 匹配路径
/// </summary>
/// <param name="route">路由条目</param>
/// <param name="request">请求</param>
private static void BindPathParameters(Route route, Request request)
{
MatchToKeys(route, request, route.Compiled.RouteRegex.Match(request.RouteUri.NoParamFullPath));
}