protected virtual void EmitCalculusFromClause(CalculusFromClause clause)
{
NewLine();
Indent();
AppendFormat("{0} ", Keywords.From);
for (int index = 0; index < clause.TableSpecifiers.Count; index++)
{
if (index > 0)
{
EmitListSeparator();
}
EmitTableSpecifier(clause.TableSpecifiers[index]);
}
}
public object Translate(TranslationContext context, ASTNode node)
{
var selectExpression = new SQLModel.SelectExpression();
var fromClause = new SQLModel.CalculusFromClause();
selectExpression.FromClause = fromClause;
var queryExpression = new SQLModel.QueryExpression();
queryExpression.SelectExpression = selectExpression;
var selectStatement = new SQLModel.SelectStatement();
selectStatement.QueryExpression = queryExpression;
// 1..* source: AliasedQuerySource
foreach (var child in ((Node)node).Children.Where(n => n.Name == "source"))
{
var tableSpecifier = TranslateAliasedQuerySource(context, child);
fromClause.TableSpecifiers.Add(tableSpecifier);
}
// 0..* define: DefineClause
foreach (var child in ((Node)node).Children.Where(n => n.Name == "define"))
{
// TODO: This would need to be nested to be accessible within context in the SQL query
throw new NotImplementedException("Define clause translation is not yet implemented");
}
// 0..* relationship: With | Without
Model.Expression relationshipConditions = null;
foreach (var child in ((Node)node).Children.Where(n => n.Name == "relationship"))
{
var relationshipCondition = TranslateRelationshipClause(context, child);
if (relationshipConditions != null)
{
relationshipConditions = new Model.BinaryExpression(relationshipConditions, "iAnd", relationshipCondition);
}
else
{
relationshipConditions = relationshipCondition;
}
}
// 0..1 where: Expression
Model.Expression whereCondition = null;
var whereConditionNode = node.Children.SingleOrDefault(n => n.Name == "where");
if (whereConditionNode != null)
{
whereCondition = (Model.Expression)context.TranslateNode(whereConditionNode);
}
// 0..1 return: ReturnClause
var returnClause = ((Node)node).Children.SingleOrDefault(n => n.Name == "return");
if (returnClause != null)
{
var selectClause = TranslateReturnClause(context, returnClause);
selectExpression.SelectClause = selectClause;
}
if (selectExpression.SelectClause == null)
{
selectExpression.SelectClause = new SQLModel.SelectClause();
selectExpression.SelectClause.NonProject = true;
}
// 0..1 sort: SortClause
var sortClause = ((Node)node).Children.SingleOrDefault(n => n.Name == "sort");
if (sortClause != null)
{
var orderClause = TranslateSortClause(context, sortClause);
selectStatement.OrderClause = orderClause;
}
return selectStatement;
}