private void parseOrderbyClause(OrderbyQueryBodyClauseNode orderby) {
setScannerState(orderby);
int endPosition;
do {
nextLexicalUnit(true);
var ordering = new OrderingNode();
setScannerState(ordering);
ordering.KeySelector = parseExpression();
endPosition = ordering.KeySelector.EndPosition;
if (lexicalUnit == LexicalUnit.ContextualKeyword) {
switch (scanner.Keyword) {
case Ascending:
endPosition = scanner.EndPosition;
nextLexicalUnit(true);
break;
case Descending:
endPosition = scanner.EndPosition;
nextLexicalUnit(true);
ordering.Descending = true;
break;
}
}
ordering.EndPosition = endPosition;
orderby.Orderings.add(ordering);
} while (lexicalUnit == LexicalUnit.Comma);
orderby.EndPosition = endPosition;
}
private void parseQueryBody(QueryBodyNode body, int endPosition) {
var done = false;
do {
switch (lexicalUnit) {
case ContextualKeyword:
case Keyword:
switch (scanner.Keyword) {
case From:
var from = new FromQueryBodyClauseNode();
parseFromClause(from);
body.Clauses.add(from);
endPosition = from.EndPosition;
break;
case Join:
var join = new JoinQueryBodyClauseNode();
parseJoinClause(join);
body.Clauses.add(join);
endPosition = join.EndPosition;
break;
case Let:
var let = new LetQueryBodyClauseNode();
parseLetClause(let);
body.Clauses.add(let);
endPosition = let.EndPosition;
break;
case Orderby:
var orderby = new OrderbyQueryBodyClauseNode();
parseOrderbyClause(orderby);
body.Clauses.add(orderby);
endPosition = orderby.EndPosition;
break;
case Where:
var where = new WhereQueryBodyClauseNode();
parseWhereClause(where);
body.Clauses.add(where);
endPosition = where.EndPosition;
break;
default:
done = true;
break;
}
break;
default:
done = true;
break;
}
} while (!done);
switch (lexicalUnit) {
case ContextualKeyword:
case Keyword:
switch (scanner.Keyword) {
case Select:
nextLexicalUnit(true);
body.SelectOrGroup = parseExpression();
endPosition = body.SelectOrGroup.EndPosition;
break;
case Group:
nextLexicalUnit(true);
body.SelectOrGroup = parseExpression();
if (lexicalUnit != LexicalUnit.ContextualKeyword || scanner.Keyword != Keyword.By) {
throw error(ParseErrorId.ByExpected);
}
nextLexicalUnit(true);
body.By = parseExpression();
endPosition = body.By.EndPosition;
break;
default:
throw error(ParseErrorId.SelectOrGroupExpected);
}
break;
default:
throw error(ParseErrorId.SelectOrGroupExpected);
}
if (lexicalUnit == LexicalUnit.ContextualKeyword && scanner.Keyword == Keyword.Into) {
if (!isIdentifier(nextLexicalUnit(true))) {
throw error(ParseErrorId.IdentifierExpected);
}
body.Continuation = new QueryContinuationNode { NameOffset = scanner.StartPosition, NameLength = getLexicalUnitLength() };
endPosition = scanner.EndPosition;
nextLexicalUnit(true);
parseQueryBody(body.Continuation.Body, endPosition);
endPosition = body.Continuation.Body.EndPosition;
}
body.EndPosition = endPosition;
}
