|
protected ParseToken ( List |
||
| tokenList | List |
Token list. |
| curIndex | int | Current index. |
| owner | the equation that this node is part of. required to pull function delegates out of the dictionary | |
| return | void | |
/// <summary>
/// Given a list of tokens and the index, get an operator node based on whatever is at that index.
/// </summary>
/// <returns>The oper node, or null if it hit the end of the equation.</returns>
/// <param name="tokenList">Token list.</param>
/// <param name="curIndex">Current index.</param>
/// <param name="owner">the equation that this node is part of. required to pull function delegates out of the dictionary</param>
static protected BaseNode ParseOperNode(List <Token> tokenList, ref int curIndex, Equation owner)
{
Debug.Assert(null != tokenList);
Debug.Assert(null != owner);
Debug.Assert(curIndex < tokenList.Count);
//what kind of token do I have at that index?
switch (tokenList[curIndex].TypeOfToken)
{
case TokenType.Operator:
{
//ok create an operator node
OperatorNode operNode = new OperatorNode();
//parse into that node
operNode.ParseToken(tokenList, ref curIndex, owner);
//return the thing
return(operNode);
}
case TokenType.CloseParen:
{
//close paren, just eat it and return null. It means this equation is finished parsing
curIndex++;
return(null);
}
default:
{
//should just be close paren nodes in here, which we should never get
throw new FormatException("Expected a \"operator\" token, but got a " + tokenList[curIndex].TypeOfToken.ToString());
}
}
}
/// <summary>
/// Given a list of tokens and the index, get an operator node based on whatever is at that index.
/// </summary>
/// <returns>The oper node, or null if it hit the end of the equation.</returns>
/// <param name="tokenList">Token list.</param>
/// <param name="curIndex">Current index.</param>
/// <param name="owner">the equation that this node is part of. required to pull function delegates out of the dictionary</param>
protected static BaseNode ParseOperNode(List<Token> tokenList, ref int curIndex, Equation owner)
{
Debug.Assert(null != tokenList);
Debug.Assert(null != owner);
Debug.Assert(curIndex < tokenList.Count);
//what kind of token do I have at that index?
switch (tokenList[curIndex].TypeOfToken)
{
case TokenType.Operator:
{
//ok create an operator node
OperatorNode operNode = new OperatorNode();
//parse into that node
operNode.ParseToken(tokenList, ref curIndex, owner);
//return the thing
return operNode;
}
case TokenType.CloseParen:
{
//close paren, just eat it and return null. It means this equation is finished parsing
curIndex++;
return null;
}
default:
{
//should just be close paren nodes in here, which we should never get
throw new FormatException("Expected a \"operator\" token, but got a " + tokenList[curIndex].TypeOfToken.ToString());
}
}
}
