/// <summary>
/// Builds the expression tree from the token queue
/// </summary>
/// <returns></returns>
public Expression BuildTree()
{
if (_tokenQueue.Count == 0)
{
Parse();
}
// make a copy of the queue, so that we don't empty the original queue
Queue <Token> tempQueue = new Queue <Token>(_tokenQueue);
Stack <Expression> exprStack = new Stack <Expression>();
List <Expression> args = new List <Expression>();
Stack <String> literalStack = new Stack <String>();
#if DEBUG
var q = tempQueue.Select(x => x.Value.ToString() + (x.GetType() == typeof(MemberToken) ? ":" + ((MemberToken)x).Name : ""));
System.Diagnostics.Debug.WriteLine(string.Join("][", q.ToArray()));
#endif
int isCastPending = -1;
Type typeCast = null;
while (tempQueue.Count > 0)
{
Token t = tempQueue.Dequeue();
if (isCastPending > -1)
{
isCastPending--;
}
if (isCastPending == 0)
{
exprStack.Push(Expression.Convert(exprStack.Pop(), typeCast));
isCastPending = -1;
}
if (t.IsIdent)
{
// handle numeric literals
exprStack.Push(Expression.Constant(t.Value, t.Type));
}
else if (t.IsType)
{
exprStack.Push(Expression.Constant(t.Value));
}
else if (t.IsOperator)
{
// handle operators
Expression result = null;
IOperator op = _operators[(string)t.Value];
Func <OpFuncArgs, Expression> opfunc = OpFuncServiceLocator.Resolve(op.GetType());
for (int i = 0; i < t.ArgCount; i++)
{
args.Add(exprStack.Pop());
}
// Arguments are in reverse order
args.Reverse();
result = opfunc(new OpFuncArgs()
{
TempQueue = tempQueue, ExprStack = exprStack, T = t, Op = op, Args = args
});
args.Clear();
exprStack.Push(result);
}
else if (t.IsCast)
{
isCastPending = 2;
typeCast = t.Type;
}
}
// we should only have one complete expression on the stack, otherwise, something went wrong
if (exprStack.Count == 1)
{
Expression pop = exprStack.Pop();
#if DEBUG
System.Diagnostics.Debug.WriteLine(pop.ToString());
#endif
return(pop);
}
else
{
throw new Exception("Invalid expression");
}
return(null);
}
/// <summary>
/// Builds the expression tree from the token queue
/// </summary>
/// <returns></returns>
public Expression BuildTree(Expression scopeParam, bool isCall)
{
if (fTokenQueue.Count == 0)
{
Parse(scopeParam != null);
}
// make a copy of the queue, so that we don't empty the original queue
var tempQueue = new Queue <Token>(fTokenQueue);
var exprStack = new Stack <Expression>();
var args = new List <Expression>();
//var literalStack = new Stack<String>();
#if DEBUG
var q = tempQueue.Select(x => (x.Value ?? "<null>").ToString()
+ (x.GetType() == typeof(MemberToken) ? ":" + ((MemberToken)x).Name : ""));
System.Diagnostics.Debug.WriteLine(string.Join("][", q.ToArray()));
#endif
int isCastPending = -1;
Type typeCast = null;
while (tempQueue.Count > 0)
{
Token t = tempQueue.Dequeue();
t.IsCall = isCall && tempQueue.Count == 0;
if (isCastPending > -1)
{
isCastPending--;
}
if (isCastPending == 0)
{
exprStack.Push(Expression.Convert(exprStack.Pop(), typeCast));
isCastPending = -1;
}
if (t.IsIdent)
{
// handle numeric literals
exprStack.Push(Expression.Constant(t.Value, t.Type));
}
else if (t.IsType)
{
exprStack.Push(Expression.Constant(t.Value));
}
else if (t.IsScope)
{
if (scopeParam == null)
{
TkDebug.ThrowToolkitException(string.Format(ObjectUtil.SysCulture,
"不是期望的标识符 {0}或者作用域为空", t.Value), this);
}
exprStack.Push(scopeParam);
}
else if (t.IsOperator)
{
// handle operators
Expression result = null;
var op = fOperators[(string)t.Value];
var opfunc = OpFuncServiceLocator.Resolve(op.GetType());
for (int i = 0; i < t.ArgCount; i++)
{
args.Add(exprStack.Pop());
}
// Arguments are in reverse order
args.Reverse();
result = opfunc(new OpFuncArgs()
{
TempQueue = tempQueue,
ExprStack = exprStack,
T = t,
Op = op,
Args = args,
ScopeParam = scopeParam,
Types = new List <string>()
{
"System.Linq"
}
});
args.Clear();
exprStack.Push(result);
}
else if (t.IsCast)
{
isCastPending = 2;
typeCast = t.Type;
}
}
// we should only have one complete expression on the stack, otherwise, something went wrong
if (exprStack.Count == 1)
{
Expression pop = exprStack.Pop();
#if DEBUG
System.Diagnostics.Debug.WriteLine(pop.ToString());
#endif
return(pop);
}
else
{
TkDebug.ThrowToolkitException("非法的表达式", this);
return(null);
}
}
