private void parseFromClause(FromQueryBodyClauseNode from) {
setScannerState(from);
var doParseType = true;
if (isIdentifier(nextLexicalUnit(true))) {
int sp = scanner.StartPosition;
int len = getLexicalUnitLength();
var restorePoint = this.createRestorePoint();
if (nextLexicalUnit(true) == LexicalUnit.Keyword && scanner.Keyword == Keyword.In) {
doParseType = false;
from.NameOffset = sp;
from.NameLength = len;
} else {
this.restore(restorePoint);
}
}
if (doParseType) {
from.Type = parseType(true);
if (!isIdentifier(lexicalUnit)) {
throw error(ParseErrorId.IdentifierExpected);
}
from.NameOffset = scanner.StartPosition;
from.NameLength = getLexicalUnitLength();
nextLexicalUnit(true);
}
if (lexicalUnit != LexicalUnit.Keyword || scanner.Keyword != Keyword.In) {
throw error(ParseErrorId.InExpected);
}
nextLexicalUnit(true);
from.Origin = parseExpression();
from.EndPosition = from.Origin.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;
}
