/// <inheritdoc/>
protected override RpnConst GetResultCore(RpnConst array, RpnConst index)
{
if (array.ValueType == RpnConst.Type.String)
{
int idx = index.GetInt();
string str = array.GetString();
if (idx < 0 || idx >= str.Length)
{
throw new InterpretationException("Index is out of range");
}
return(new RpnString(str[idx].ToString()));
}
if (array.ValueType != RpnConst.Type.Variable)
{
throw new InterpretationException("Cannot index not a variable");
}
if (index.ValueType == RpnConst.Type.String ||
index.ValueType == RpnConst.Type.Integer ||
index.ValueType == RpnConst.Type.Float)
{
var indexedName = ConstructName(array.GetString(), index);
return(new RpnVar(indexedName));
}
throw new InterpretationException("Index type should be a number or a string");
}
/// <inheritdoc/>
protected override RpnConst GetResultCore(RpnConst left, RpnConst right)
=> left.ValueType switch
{
/// <inheritdoc/> protected override RpnConst GetResultCore(RpnConst operand) => new RpnInteger(!operand.GetBool());
/// <inheritdoc/>
protected override RpnConst GetResultCore(RpnConst operand)
=> operand.ValueType switch
{
/// <inheritdoc/> protected override RpnConst GetResultCore(RpnConst left, RpnConst right) => new RpnInteger(left.GetBool() || right.GetBool());
/// <summary>
/// Constructs the name of the array item by the collection name and its index.
/// </summary>
private string ConstructName(string arrayName, RpnConst index)
=> $"{arrayName}#{index.ValueType.ToString()[0]}#{index.GetString()}";
