//raise_stmt: 'raise' [expression [',' expression [',' expression]]]
private RaiseStatement ParseRaiseStmt()
{
Eat(TokenKind.KeywordRaise);
string raiseWhiteSpace = _tokenWhiteSpace;
string commaWhiteSpace = null, secondCommaWhiteSpace = null;
var start = GetStart();
Expression type = null, value = null, traceback = null, cause = null;
bool isFromForm = false;
if (!NeverTestToken(PeekToken())) {
type = ParseExpression();
if (MaybeEat(TokenKind.Comma)) {
var commaStart = GetStart();
commaWhiteSpace = _tokenWhiteSpace;
value = ParseExpression();
if (!_langVersion.Is6x()) {
ReportSyntaxError(commaStart, GetEnd(), "invalid syntax, only exception value is allowed in 3.x.");
}
if (MaybeEat(TokenKind.Comma)) {
secondCommaWhiteSpace = _tokenWhiteSpace;
traceback = ParseExpression();
}
} else if (MaybeEat(TokenKind.KeywordFrom)) {
commaWhiteSpace = _tokenWhiteSpace;
var fromStart = GetStart();
cause = ParseExpression();
isFromForm = true;
if (!_langVersion.Is7x()) {
ReportSyntaxError(fromStart, cause.EndIndex, "invalid syntax, from cause not allowed in 2.x.");
}
}
}
RaiseStatement ret = new RaiseStatement(type, value, traceback, cause);
if (_verbatim) {
AddPreceedingWhiteSpace(ret, raiseWhiteSpace);
AddSecondPreceedingWhiteSpace(ret, commaWhiteSpace);
AddThirdPreceedingWhiteSpace(ret, secondCommaWhiteSpace);
if (isFromForm) {
AddIsAltForm(ret);
}
}
ret.SetLoc(start, GetEnd());
return ret;
}
public override bool Walk(RaiseStatement node)
{
UpdateChildRanges(node);
return base.Walk(node);
}
public override void PostWalk(RaiseStatement node)
{
PostWalkWorker(node);
}
// RaiseStatement
public override bool Walk(RaiseStatement node)
{
return ShouldWalkWorker(node);
}
public override bool Walk(RaiseStatement node)
{
_raises = true;
return base.Walk(node);
}