public bool VariableIsRemovable(Variable variable)
{
return !(variable is BoundVariable);
}
/// <summary>
/// Try to make a new local variable at the localmost scoping level and
/// give it a starting value. It errors out of there is already one there
/// by the same name.<br/>
/// <br/>
/// This does NOT scan up the scoping stack like SetValue() does.
/// It operates at the local level only.<br/>
/// <br/>
/// This is the normal way to make a new local variable. You cannot make a
/// local variable without attempting to give it a value.
/// </summary>
/// <param name="identifier">variable name to attempt to store into</param>
/// <param name="value">value to put into it</param>
public void SetNewLocal(string identifier, object value)
{
Variable variable;
VariableScope localDict = GetNestedDictionary(0);
if (!localDict.Variables.TryGetValue(identifier, out variable))
{
variable = new Variable { Name = identifier };
AddVariable(variable, identifier, true);
}
variable.Value = value;
}
/// <summary>
/// Make a new global variable at the localmost scoping level and
/// give it a starting value, or overwrite an existing variable
/// at the localmost level with a starting value.<br/>
/// <br/>
/// This does NOT scan up the scoping stack like SetValue() does.
/// It operates at the global level only.<br/>
/// </summary>
/// <param name="identifier">variable name to attempt to store into</param>
/// <param name="value">value to put into it</param>
public void SetGlobal(string identifier, object value)
{
Variable variable;
// Attempt to get it as a global. Make a new one if it's not found.
// This preserves the "bound-ness" of the variable if it's a
// BoundVariable, whereas unconditionally making a new Variable wouldn't:
if (!globalVariables.Variables.TryGetValue(identifier, out variable))
{
variable = new Variable { Name = identifier };
AddVariable(variable, identifier, false, true);
}
variable.Value = value;
}
/// <summary>
/// Make a new variable at either the local depth or the
/// global depth depending.
/// throws exception if it already exists as a boundvariable at the desired
/// scope level, unless overwrite = true.
/// </summary>
/// <param name="variable">variable to add</param>
/// <param name="identifier">name of variable to add</param>
/// <param name="local">true if you want to make it at local depth</param>
/// <param name="overwrite">true if it's okay to overwrite an existing variable</param>
public void AddVariable(Variable variable, string identifier, bool local, bool overwrite = false)
{
identifier = identifier.ToLower();
if (!identifier.StartsWith("$"))
{
identifier = "$" + identifier;
}
VariableScope whichDict = local ? GetNestedDictionary(0) : globalVariables;
if (whichDict.Variables.ContainsKey(identifier))
{
if (whichDict.Variables[identifier].Value is BoundVariable)
if (!overwrite)
throw new KOSIdentiferClashException(identifier);
whichDict.Variables.Remove(identifier);
}
whichDict.Variables.Add(identifier, variable);
}
/// <summary>
/// Get the value of a variable or create it at global scope if not found.
/// </summary>
/// <param name="identifier"></param>
/// <returns></returns>
private Variable GetOrCreateVariable(string identifier)
{
Variable variable = GetVariable(identifier, false, true);
if (variable == null)
{
variable = new Variable { Name = identifier };
AddVariable(variable, identifier, false);
}
return variable;
}
public void AddVariable(Variable variable, string identifier, bool local, bool overwrite = false)
{
throw new NotImplementedException();
}