public bool TryGetValue(string key, out KalkUnit value)
{
value = null;
if (TryGetValue(null, new SourceSpan(), key, out var valueObj))
{
value = (KalkUnit)valueObj;
return(true);
}
return(false);
}
public KalkExpression RegisterUnit(KalkUnit unit, string description = null, string symbol = null, KalkExpression value = null, string plural = null, string prefix = null, bool isUser = false)
{
if (unit == null)
{
throw new ArgumentNullException(nameof(unit));
}
var name = unit.Name;
symbol ??= name;
// Override isUser
if (_registerAsSystem)
{
isUser = false;
}
CheckVariableAvailable(name, nameof(name), false);
var prefixList = new List <KalkUnitPrefix>();
if (prefix != null)
{
var prefixes = prefix.Split(new[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
foreach (var prefixItem in prefixes)
{
if (prefixItem == "decimal")
{
prefixList.AddRange(KalkUnitPrefix.GetDecimals());
}
else if (prefixItem == "binary")
{
prefixList.AddRange(KalkUnitPrefix.GetBinaries());
}
else if (KalkUnitPrefix.TryGet(prefixItem, out var descriptor))
{
prefixList.Add(descriptor);
}
else
{
throw new ArgumentException($"The prefix `{prefixItem}` does not exist.", nameof(prefix));
}
}
prefixList = prefixList.Distinct().ToList();
}
// Pre-check all prefix with name/symbol
foreach (var prefixDesc in prefixList)
{
var prefixWithName = $"{prefixDesc.Name}{name}";
CheckVariableAvailable(prefixWithName, nameof(name), false);
var prefixWithSymbol = $"{prefixDesc.Prefix}{symbol}";
CheckVariableAvailable(prefixWithSymbol, nameof(name), false);
}
unit.Description = description;
unit.Symbol = symbol;
unit.Value = value;
unit.IsUser = isUser;
unit.Prefix = prefix;
if (plural != null)
{
unit.Plural = plural;
}
if (unit.Symbol != unit.Name)
{
CheckVariableAvailable(unit.Symbol, nameof(symbol), false);
}
if (unit.Plural != unit.Name)
{
CheckVariableAvailable(unit.Plural, nameof(plural), false);
}
// Here we are all done after checking everything
Units.Add(name, unit);
if (unit.Symbol != unit.Name)
{
Units.Add(unit.Symbol, unit);
}
if (unit.Plural != unit.Name)
{
Units.Add(unit.Plural, unit);
}
// Register prefixes
foreach (var prefixDesc in prefixList)
{
var prefixWithName = $"{prefixDesc.Name}{unit.Name}";
var prefixWithSymbol = $"{prefixDesc.Prefix}{unit.Symbol}";
var unitPrefix = new KalkUnit(prefixWithName)
{
Description = description,
Symbol = prefixWithSymbol,
Value = new KalkBinaryExpression(Math.Pow(prefixDesc.Base, prefixDesc.Exponent), ScriptBinaryOperator.Multiply, unit),
IsUser = isUser,
Parent = unit,
};
unit.Derived.Add(unitPrefix);
Units.Add(prefixWithName, unitPrefix);
Units.Add(prefixWithSymbol, unitPrefix);
}
return(unit);
}
