private void PrepareForReading(IScope scope, VariableOptions options)
{
foreach (Variable v in scope.Variables)
{
for (int i = 0; i <= _scopeFactor * v.Parent.FunctionDepth; ++i)
{
_candidates.Add(v);
}
}
}
private void PrepareForWriting(IScope scope, VariableOptions options)
{
foreach (Variable v in scope.Variables)
{
if (v.IsLoopCounter || v.IsConstant)
{
continue;
}
for (int i = 0; i <= _scopeFactor * v.Parent.FunctionDepth; ++i)
{
_candidates.Add(v);
}
}
}
private void PrepareForWriting(IScope scope, VariableOptions options)
{
foreach (Variable v in scope.Variables)
{
if (v.IsLoopCounter || v.IsConstant)
{
continue;
}
if (options.Has(VariableOptions.NonFunctionInitializer) && (v.Initializer is FunctionExpression))
{
continue;
}
for (int i = 0; i <= _scopeFactor * v.Parent.FunctionDepth; ++i)
{
_candidates.Add(v);
}
}
}
public Variable ChooseVariable(IScope scope, VariableOptions options = VariableOptions.None)
{
_candidates.Clear();
if (options.Has(VariableOptions.ForWriting))
{
PrepareForWriting(scope, options);
}
else
{
PrepareForReading(scope, options);
}
var count = _candidates.Count;
if (count > 0)
{
return(_rand.Choose(_candidates));
}
return(null);
}
public static bool Has(this VariableOptions options, VariableOptions vo)
{
return((options & vo) != 0);
}
