public bool MoveNext()
{
if( m_nIdx >= m_strarrTokens.Length )
return false;
m_Token = new Token( m_strarrTokens[m_nIdx]);
m_nIdx++;
return true;
}
public void AddToken(Token token)
{
m_Tokens.Add(token); // Add tokens in order of precedence
}
private static SemanticToken OperatorToOpcode(Token token)
{
var t = new SemanticToken() { TokenType = token.TokenType, OperationType = token.OperationType };
switch (t.TokenType)
{
case TokenType.Add:
t.Precedence = 6;
t.OperatorAssociativity = OperatorAssociativity.Left;
break;
case TokenType.Subtract:
t.Precedence = 6;
t.OperatorAssociativity = OperatorAssociativity.Left;
break;
case TokenType.Multiply:
t.Precedence = 7;
t.OperatorAssociativity = OperatorAssociativity.Left;
break;
case TokenType.Divide:
t.Precedence = 7;
t.OperatorAssociativity = OperatorAssociativity.Left;
break;
case TokenType.PowerOf:
t.Precedence = 7;
t.OperatorAssociativity = OperatorAssociativity.Right;
break;
case TokenType.UnaryMinus:
t.Precedence = 8;
t.OperatorAssociativity = OperatorAssociativity.Right;
break;
case TokenType.Negation:
t.Precedence = 8;
t.OperatorAssociativity = OperatorAssociativity.Right;
break;
case TokenType.Modulo:
t.Precedence = 7;
t.OperatorAssociativity = OperatorAssociativity.Left;
break;
case TokenType.GreaterThan:
t.Precedence = 5;
t.OperatorAssociativity = OperatorAssociativity.Left;
break;
case TokenType.GreaterThanOrEqualTo:
t.Precedence = 5;
t.OperatorAssociativity = OperatorAssociativity.Left;
break;
case TokenType.LessThan:
t.Precedence = 5;
t.OperatorAssociativity = OperatorAssociativity.Left;
break;
case TokenType.LessThanOrEqualTo:
t.Precedence = 5;
t.OperatorAssociativity = OperatorAssociativity.Left;
break;
case TokenType.Equal:
t.Precedence = 4;
t.OperatorAssociativity = OperatorAssociativity.Left;
break;
case TokenType.NotEqual:
t.Precedence = 4;
t.OperatorAssociativity = OperatorAssociativity.Left;
break;
case TokenType.LogicalAnd:
t.Precedence = 3;
t.OperatorAssociativity = OperatorAssociativity.Left;
break;
case TokenType.LogicalOr:
t.Precedence = 2;
t.OperatorAssociativity = OperatorAssociativity.Left;
break;
default:
throw new ExpressionParserException(String.Format("Unknown operator{0}", t));
break;
}
return t;
}
