public AssignmentResult CheckAssignment(int startLine, string variableName, SqlTypeInfo other)
{
if (this == SqlTypeInfo.Unknown)
{
return AssignmentResult.OK;
}
if (other == SqlTypeInfo.Unknown)
{
return AssignmentResult.OK;
}
var fullOther = (FullSqlTypeInfo)other;
return ((FullSqlTypeInfo)this).CheckFullAssignment(startLine, variableName, fullOther);
}
internal static SqlTypeInfo CreateFromBinaryExpression(SqlTypeInfo leftType, SqlTypeInfo rightType, BinaryExpressionType binaryExpressionType)
{
if (leftType == SqlTypeInfo.Unknown || rightType == SqlTypeInfo.Unknown)
{
return SqlTypeInfo.Unknown;
}
// these binary expressions produce a result of the highest-precedence type of their operands
if (binaryExpressionType == BinaryExpressionType.Add
|| binaryExpressionType == BinaryExpressionType.Subtract
|| binaryExpressionType == BinaryExpressionType.Multiply
|| binaryExpressionType == BinaryExpressionType.Divide)
{
return ((FullSqlTypeInfo)leftType).GetHigherPrecedenceType((FullSqlTypeInfo)rightType);
}
return SqlTypeInfo.Unknown; // TODO: support other expressions
}