/// <summary>
/// Visit a parse tree produced by <see cref="Generated.Z80AsmParser.shiftExpr"/>.
/// </summary>
/// <param name="context">The parse tree.</param>
/// <return>The visitor result.</return>
public override object VisitShiftExpr(Z80AsmParser.ShiftExprContext context)
{
if (IsInvalidContext(context))
{
return(null);
}
var expr = (ExpressionNode)VisitAddExpr(context.GetChild(0) as Z80AsmParser.AddExprContext);
var nextChildIndex = 2;
while (nextChildIndex < context.ChildCount)
{
var rightExpr = VisitAddExpr(context.GetChild(nextChildIndex)
as Z80AsmParser.AddExprContext);
var opToken = context.GetChild(nextChildIndex - 1).NormalizeToken();
var shiftExpr = opToken == "<<"
? new ShiftLeftOperationNode()
: new ShiftRightOperationNode() as BinaryOperationNode;
shiftExpr.LeftOperand = expr;
shiftExpr.RightOperand = (ExpressionNode)rightExpr;
expr = shiftExpr;
nextChildIndex += 2;
}
return(expr);
}
public override object VisitShiftExpr(Z80AsmParser.ShiftExprContext context)
{
if (context == null)
{
return(null);
}
var subExprs = context.addExpr();
var expr = VisitAddExpr(subExprs[0]);
var opIndex = 1;
for (var i = 1; i < subExprs.Length; i++)
{
var rightExpr = VisitAddExpr(subExprs[i]);
var opToken = context.GetChild(opIndex).GetText();
BinaryOperationNode shiftExpr;
switch (opToken)
{
case "<<":
shiftExpr = new ShiftLeftOperationNode(expr, rightExpr);
break;
default: // >>
shiftExpr = new ShiftRightOperationNode(expr, rightExpr);
break;
}
expr = shiftExpr;
opIndex += 2;
}
return(expr);
}
public ShiftLeftOperationNode(Z80AsmParser.ShiftExprContext context, Z80AsmVisitor visitor)
: base(context, context.expr()[0], context.expr()[1], visitor)
{
}
/// <summary>
/// Visit a parse tree produced by <see cref="Z80AsmParser.shiftExpr"/>.
/// <para>
/// The default implementation returns the result of calling <see cref="AbstractParseTreeVisitor{Result}.VisitChildren(IRuleNode)"/>
/// on <paramref name="context"/>.
/// </para>
/// </summary>
/// <param name="context">The parse tree.</param>
/// <return>The visitor result.</return>
public virtual Result VisitShiftExpr([NotNull] Z80AsmParser.ShiftExprContext context)
{
return(VisitChildren(context));
}
/// <summary>
/// Exit a parse tree produced by <see cref="Z80AsmParser.shiftExpr"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitShiftExpr([NotNull] Z80AsmParser.ShiftExprContext context)
{
}
