public override ExprNode VisitInfixExpr(ExprParser.InfixExprContext context)
{
InfixNode node;
switch (context.op.Type)
{
case ExprLexer.OP_ADD: node = new AddNode(); break;
case ExprLexer.OP_SUB: node = new SubNode(); break;
case ExprLexer.OP_DIV: node = new DivNode(); break;
case ExprLexer.OP_MUL: node = new MulNode(); break;
case ExprLexer.OP_POW: node = new PowNode(); break;
default: throw new NotSupportedException($"Operation type {context.op.Type} is not supported");
}
node.Left = Visit(context.left);
node.Right = Visit(context.right);
return(node);
}
public override double Visit(SubNode node)
{
return(Visit(node.Left) - Visit(node.Right));
}