private DirectiveTriviaSyntax ParseElifDirective(SyntaxToken hash, SyntaxToken keyword, bool isActive, bool endIsActive)
{
var expr = this.ParseExpression();
var eod = this.ParseEndOfDirective(ignoreErrors: false);
if (_context.HasPreviousIfOrElif())
{
var isTrue = this.EvaluateBool(expr);
var branchTaken = endIsActive && isTrue && !_context.PreviousBranchTaken();
return(SyntaxFactory.ElifDirectiveTrivia(hash, keyword, expr, eod, endIsActive, branchTaken, isTrue));
}
else
{
eod = eod.TokenWithLeadingTrivia(SyntaxList.Concat(SyntaxFactory.DisabledText(expr.ToFullString()), eod.GetLeadingTrivia()));
if (_context.HasUnfinishedRegion())
{
return(this.AddError(SyntaxFactory.BadDirectiveTrivia(hash, keyword, eod, isActive), ErrorCode.ERR_EndRegionDirectiveExpected));
}
else if (_context.HasUnfinishedIf())
{
return(this.AddError(SyntaxFactory.BadDirectiveTrivia(hash, keyword, eod, isActive), ErrorCode.ERR_EndifDirectiveExpected));
}
else
{
return(this.AddError(SyntaxFactory.BadDirectiveTrivia(hash, keyword, eod, isActive), ErrorCode.ERR_UnexpectedDirective));
}
}
}