public TernaryOperatorNode Build()
{
TernaryOperatorNode ternaryNode = new TernaryOperatorNode();
while (_reader.HasNext())
{
var node = new AstNodeBuilder(_reader, _block, _interceptChars).Build();
if (node == null)
{
throwError("ternary empty expression is not allowed!");
}
/*
* expression end
*
*/
if (_reader.Current().Value == ";")
{
if (ternaryNode.Operands.Count == 2)//more two
{
throwError("ternary expression incorrect!");
}
else if (ternaryNode.Operands.Count == 0)// only one
{
throwError("ternary expression incorrect!");
}
else
{
ternaryNode.Operands.Add(node);
return(ternaryNode);
}
}
/*
* start a new ternary builder
*
*/
else if (_reader.Current().Value == "?")
{
if (!node.OutputType.IsBool())
{
throwError("before '?' require a expression which output is bool! ");
}
var ternaryNode2 = new TerbaryBuilder(_reader, _block).Build();
ternaryNode2.Operands.Insert(0, node);
ternaryNode.Operands.Add(ternaryNode2);
if (_reader.Current().Value == ";")
{
if (ternaryNode.Operands.Count != 2)
{
throwError("incompleted ternary exception!");
}
return(ternaryNode);
}
}
else if (_reader.Current().Value == ":")
{
if (ternaryNode.Operands.Count == 1)
{
ternaryNode.Operands.Add(node);
return(ternaryNode);
}
else
{
ternaryNode.Operands.Add(node);
}
}
}
throwError("incompleted ternary expression!");
return(ternaryNode);
}
public OperatorNode Build()
{
while (_reader.HasNext())
{
_reader.Next();
if (_interceptChars.Contains(_reader.Current().Value))
{
return(finishBuild());
}
switch (_reader.Current().TokenType)
{
/*
* in this builder keywords are not allowed
*/
case TokenType.Keyword:
throwUnexceptedError();
break;
case TokenType.Operator:
/*
* check priority
*
* 1. if current operator is higher than current
* start a builder,reader go back and reset current operator 's right operand
* 2. if current operator's priority is lower than current and has parent builder ,Back one token and return
* 3. main build loop.
*/
var priority = _reader.Current().OperatorType.GetPriority();
/*
*
* first set priority
*/
if (_currentPriority == -2)
{
_currentPriority = priority;
}
else
{
/*
* start a new priority builder
*
*/
if (priority > _currentPriority)
{
buildNewPriority();
continue;
}
else if (priority < _currentPriority && _hasParent && _reader.Current().OperatorType != OperatorType.LeftParenthesis)
{
return(finishBuild());
}
}
switch (_reader.Current().OperatorType)
{
//can not post to here
//those operator should be handled or intercepted by higher level builder
case OperatorType.Binary:
case OperatorType.Function:
case OperatorType.Coma:
case OperatorType.Declare:
case OperatorType.ExpressionEnd:
case OperatorType.Break:
case OperatorType.Continue:
case OperatorType.RightParenthesis:
case OperatorType.RightBrace:
case OperatorType.RightSquare:
throwUnexceptedError();
break;
case OperatorType.Assignment:
pushOrderedNode(OperatorNodeFactory.CreateAssigment(_block));
break;
case OperatorType.AddAsignment:
pushOrderedNode(OperatorNodeFactory.CreateAddAssignment(_block));
break;
case OperatorType.SubtractAsignment:
pushOrderedNode(OperatorNodeFactory.CreateSubtractAssignment(_block));
break;
case OperatorType.MutiplyAsignment:
pushOrderedNode(OperatorNodeFactory.CreateMultiplyAssignment(_block));
break;
case OperatorType.DevideAsignment:
pushOrderedNode(OperatorNodeFactory.CreateDevideAsignmentOperatorNode(_block));
break;
case OperatorType.Ternary:
var ternaryNode = new TerbaryBuilder(_reader, _block).Build();
ternaryNode.Operands.Insert(0, _currentNode);
/*
* back one token ,because ';' has been intercepted by ternary builder;
*
*/
// _reader.Back();
return(ternaryNode);
case OperatorType.Minus:
break;
case OperatorType.And:
pushOrderedNode(OperatorNodeFactory.CreateAnd());
break;
case OperatorType.Or:
pushOrderedNode(OperatorNodeFactory.CreateOr());
break;
case OperatorType.Not:
pushNot(OperatorNodeFactory.CreateNot());
break;
case OperatorType.Equel:
pushOrderedNode(OperatorNodeFactory.CreateCompareEquel());
break;
case OperatorType.NotEquel:
pushOrderedNode(OperatorNodeFactory.CreateCompareNotEquel());
break;
case OperatorType.MemberAccess:
pushOrderedNode(OperatorNodeFactory.CreateMemeber());
break;
case OperatorType.LeftParenthesis:
/*
* maybe new heighest priority operator or method call
*
* method call intercepted by push identifier
*
*/
if (_currentNode == null)
{
/*
* expressiomn starts with "("
*/
_currentNode = new ParenthesisBuilder(_reader, _block).Build();
/*
* _current priority has been set by "(",we should ignore that operator
*/
_currentPriority = -2;
}
else
{
if (_reader.Last().TokenType == TokenType.Identifier)
{
/*
* call at epression start
*/
if (_currentPriority == -1)
{
var node = new CallBuilder(_reader, _block).Build();
node.Operands.Insert(0, _currentNode);
_currentNode = node;
_currentPriority = 8;
}
/*
* member call
*/
else if (_currentPriority == 8)
{
var node = new CallBuilder(_reader, _block).Build();
node.Operands.Insert(0, _currentNode);
_currentNode = node;
}
/*
* start a new priority then build call
*/
else
{
buildNewPriority();
}
}
else if (_reader.Last().TokenType != TokenType.Operator) //"ssss"(5+8)
{
throwUnexceptedError();
}
else
{
//start a new builder
var node = new ParenthesisBuilder(_reader, _block).Build();
_currentNode.Operands.Add(node);
}
}
break;
/*
* can just be object literal
*/
case OperatorType.LeftBrace:
if (_currentNode != null)
{
throwUnexceptedError();
}
else
{
_currentNode = new OperandNode(new ObjectLiteralBuilder(_reader, _block).Build());
}
break;
/*
* array index call or array literal
*
* array index call intercepted by pushidentifier
*
*/
case OperatorType.LeftSquare:
if (_currentNode != null)
{
if (_reader.Last().TokenType != TokenType.Identifier)
{
throwUnexceptedError();
}
else
{
/*
* call at epression start
*/
if (_currentPriority == -1)
{
var node = new ArrayIndexBuilder(_reader, _block).Build();
node.Operands.Insert(0, _currentNode);
_currentNode = node;
_currentPriority = 8;
}
/*
* member call
*/
else if (_currentPriority == 8)
{
var node = new ArrayIndexBuilder(_reader, _block).Build();
node.Operands.Insert(0, _currentNode);
_currentNode = node;
}
/*
* start a new priority
*/
else
{
buildNewPriority();
}
}
}
else
{
_currentNode = new OperandNode(new JMappingObject(new ArrayLiteralBuilder(_reader, _block).Build()));
}
break;
case OperatorType.Add:
pushOrderedNode(OperatorNodeFactory.CreateAdd());
break;
case OperatorType.Subtract:
pushOrderedNode(OperatorNodeFactory.CreateReduce());
break;
case OperatorType.Mod:
pushOrderedNode(OperatorNodeFactory.CreateMod());
break;
case OperatorType.Mutiply:
pushOrderedNode(OperatorNodeFactory.CreateMutiply());
break;
case OperatorType.Devide:
pushOrderedNode(OperatorNodeFactory.CreateDevide());
break;
case OperatorType.Bigger:
pushOrderedNode(OperatorNodeFactory.CreateBigger());
break;
case OperatorType.BiggerEquel:
pushOrderedNode(OperatorNodeFactory.CreateBiggerEquelNode());
break;
case OperatorType.Less:
pushOrderedNode(OperatorNodeFactory.CreateLess());
break;
case OperatorType.LessEquel:
pushOrderedNode(OperatorNodeFactory.CreateLessEquel());
break;
// just suppoort left increment and decrement
case OperatorType.Increment:
pushUnaryOperator(OperatorNodeFactory.CreateIncrement(_block));
break;
case OperatorType.Decrement:
pushUnaryOperator(OperatorNodeFactory.CreateDecremnet(_block));
break;
case OperatorType.NewInstance:
pushNew(OperatorNodeFactory.CreateNew());
break;
}
break;
case TokenType.Identifier:
pushIdentifier(OperatorNodeFactory.CreateOperrand(new JString(_reader.Current().Value)));
break;
case TokenType.String:
pushValue(OperatorNodeFactory.CreateOperrand(new JString(_reader.Current().Value)));
break;
case TokenType.Number:
pushValue(OperatorNodeFactory.CreateOperrand(new JNumber(_reader.Current().Value)));
break;
case TokenType.Bool:
pushValue(OperatorNodeFactory.CreateOperrand(new JBool(_reader.Current().Value)));
break;
}
}
/*
* this builder should finish by interceptor not by finsh iteration
*
*
*/
throwError("expression incomplete;");
return(null);
}
