public static bool TryParseNode(IParser parser, out SkipStatement node)
{
node = null;
bool result = false;
if (parser.PeekToken(TokenKind.SkipKeyword))
{
result = true;
node = new SkipStatement();
parser.NextToken();
node.StartIndex = parser.Token.Span.Start;
if (parser.PeekToken(TokenKind.ToKeyword))
{
parser.NextToken();
if (parser.PeekToken(TokenKind.TopKeyword) &&
parser.PeekToken(TokenKind.OfKeyword, 2) &&
parser.PeekToken(TokenKind.PageKeyword, 3))
{
parser.NextToken();
parser.NextToken();
parser.NextToken();
}
else
{
parser.ReportSyntaxError("Expected \"top of page\" in skip statement.");
}
}
else
{
ExpressionNode numLines;
if (FglExpressionNode.TryGetExpressionNode(parser, out numLines))
{
node.NumLines = numLines;
}
else
{
parser.ReportSyntaxError("Invalid expression found in skip statement.");
}
if (parser.PeekToken(TokenKind.LineKeyword) || parser.PeekToken(TokenKind.LinesKeyword))
{
parser.NextToken();
}
}
node.EndIndex = parser.Token.Span.End;
}
return(result);
}
private static bool TryGetReportStatement(IParser parser, out FglStatement node, ReportBlockNode reportNode, bool returnFalseInsteadOfErrors = false)
{
bool result = false;
node = null;
switch (parser.PeekToken().Kind)
{
case TokenKind.PrintKeyword:
{
PrintStatement prtStmt;
if ((result = PrintStatement.TryParseNode(parser, out prtStmt, reportNode)))
{
node = prtStmt;
}
break;
}
case TokenKind.PrintxKeyword:
{
PrintxStatement prtxStmt;
if ((result = PrintxStatement.TryParseNode(parser, out prtxStmt)))
{
node = prtxStmt;
}
break;
}
case TokenKind.NeedKeyword:
{
NeedStatement needStmt;
if ((result = NeedStatement.TryParseNode(parser, out needStmt)))
{
node = needStmt;
}
break;
}
case TokenKind.PauseKeyword:
{
PauseStatement pauseStmt;
if ((result = PauseStatement.TryParseNode(parser, out pauseStmt)))
{
node = pauseStmt;
}
break;
}
case TokenKind.SkipKeyword:
{
SkipStatement skipStmt;
if ((result = SkipStatement.TryParseNode(parser, out skipStmt)))
{
node = skipStmt;
}
break;
}
default:
result = false;
break;
}
return(result);
}
