public override bool Scan(SyntaxTreeBuilder pSyntaxTreeBuilder)
{
if (!pSyntaxTreeBuilder.KeepScanning)
{
return(true);
}
if (FirstSet.Contains(pSyntaxTreeBuilder.TokenScanner.Current))
{
return(rhs.Scan(pSyntaxTreeBuilder));
}
else if (!FirstSet.ContainsEmpty())
{
return(false);
}
return(true);
}
public override ParseNode_Base Parse(SyntaxTreeBuilder pSyntaxTreeBuilder)
{
foreach (var node in nodes)
{
if (node.Matches(pSyntaxTreeBuilder))
{
return(node.Parse(pSyntaxTreeBuilder));
}
}
if (FirstSet.ContainsEmpty())
{
return(NextAfterChild(this, pSyntaxTreeBuilder));
}
pSyntaxTreeBuilder.SyntaxErrorExpected(FirstSet);
return(this);
}
public override bool Scan(SyntaxTreeBuilder pSyntaxTreeBuilder)
{
if (!pSyntaxTreeBuilder.KeepScanning)
{
return(true);
}
foreach (var node in nodes)
{
if (node.Matches(pSyntaxTreeBuilder))
{
return(node.Scan(pSyntaxTreeBuilder));
}
}
if (!FirstSet.ContainsEmpty())
{
return(false);
}
return(true);
}
public override ParseNode_Base Parse(SyntaxTreeBuilder pSyntaxTreeBuilder)
{
bool wasError = pSyntaxTreeBuilder.ErrorMessage != null;
ParseNode_Base ret = null;
if (FirstSet.Contains(pSyntaxTreeBuilder.TokenScanner.Current))
{
ret = rhs.Parse(pSyntaxTreeBuilder);
}
if ((ret == null || !wasError && pSyntaxTreeBuilder.ErrorMessage != null) && !FirstSet.ContainsEmpty())
{
pSyntaxTreeBuilder.SyntaxErrorExpected(FirstSet);
return(ret ?? this);
}
if (ret != null)
{
return(ret);
}
return(NextAfterChild(rhs, pSyntaxTreeBuilder)); // ready to be reduced
}
