public override ExprNode VisitUnaryExpr(ExprParser.UnaryExprContext context)
{
switch (context.op.Type)
{
case ExprLexer.OP_ADD: return(Visit(context.expr()));
case ExprLexer.OP_SUB: return(new NegNode()
{
InnerNode = Visit(context.expr())
});
default: throw new NotSupportedException($"Unary operator {context.op} is not supported");
}
}
/// <summary>
/// Exit a parse tree produced by the <c>unaryExpr</c>
/// labeled alternative in <see cref="ExprParser.expr"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitUnaryExpr([NotNull] ExprParser.UnaryExprContext context)
{
}
/// <summary>
/// Visit a parse tree produced by the <c>unaryExpr</c>
/// labeled alternative in <see cref="ExprParser.expr"/>.
/// <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 VisitUnaryExpr([NotNull] ExprParser.UnaryExprContext context)
{
return(VisitChildren(context));
}