internal Type ReadType(string typeName = null, bool ignoreException = false)
{
Type type = null;
StringBuilder sbValue = new StringBuilder(string.IsNullOrEmpty(typeName) ? spResult.Next().Text : typeName);
do
{
// 读取参数
if (spResult.IsGenericType())
{
spResult.Skip();
List <Type> types = new List <Type>();
while (true)
{
types.Add(ReadType());
if (spResult.PeekNext().Is(OperatorWord.Comma))
{
spResult.Skip();
}
else
{
break;
}
}
spResult.Next().Is(OperatorWord.RightAngleBracket, true);
sbValue.AppendFormat("`{0}[{1}]", types.Count, string.Join(",", types.Select(p => "[" + p.AssemblyQualifiedName + "]").ToArray()));
}
type = GetType(sbValue.ToString());
if (type == null)
{
var token = spResult.Next();
if (!token.Is(OperatorWord.Dot))
{
if (ignoreException)
{
break;
}
throw new ArgumentException(string.Format("Unsupported {0}", token.Text));
}
sbValue.Append(".");
sbValue.Append(spResult.Next().Text);
}
} while (type == null);
return(type);
}
/// <summary>
/// 处理表达式前缀.
/// </summary>
private void ProcessLambdaPrefix()
{
// 检查是否有 Lambda 前置符(如: m => )
if (spResult.Any(p => p.Is(OperatorWord.LambdaPrefix)))
{
Token token = spResult.Next();
if (token.Is(OperatorWord.LeftBracket))
{
// 有括号时，可以有多个参数
var bracketContent = spResult.SkipUntil(p => p.Is(OperatorWord.RightBracket));
bracketContent.RemoveAt(bracketContent.Count - 1);
// 检测下一个Token是否为LambdaPrefix
if (!spResult.Next().Is(OperatorWord.LambdaPrefix))
{
spResult.ReturnToIndex();
return;
}
// 解析参数
IEnumerable <Token> parameters = ResolveParameters(bracketContent);
int index = 0;
foreach (var item in parameters)
{
expParams.Add(Expression.Parameter(parameterTypes[index++], item.Text));
}
}
else if (token.Type == TokenType.Identifier && (char.IsLetter(token.Text[0]) || token.Text[0] == MarkChar.Underline) && !OperatorWord.Contains(token.Text))
{
// 无括号时，最多只有一个参数
// 检测下一个Token是否为LambdaPrefix
if (!spResult.Next().Is(OperatorWord.LambdaPrefix))
{
spResult.ReturnToIndex();
return;
}
expParams.Add(Expression.Parameter(parameterTypes[0], token.Text));
}
// 参数表达式个数和传入委托参数个数不匹配判断
if (expParams.Count != parameterTypes.Length)
{
throw new ArgumentOutOfRangeException("The count of parameters is not equal.");
}
}
}
