public JsVariableDeclarator HoistVariable(LiftedVariableKey symbol)
{
var identifier = symbol.Identifier;
if (hoistedVariables.ContainsKey(symbol) || hoistedVariables.ContainsKey(new LiftedVariableKey(symbol.Identifier)))
{
identifier = GenerateNewNamePrivate(symbol);
symbol = new LiftedVariableKey(identifier, symbol.Symbol);
}
// Register the variable so we avoid collisions.
hoistedVariables[symbol] = identifier;
if (symbol.Symbol == null)
{
hoistedVariables[new LiftedVariableKey(symbol.Identifier)] = identifier;
}
// Declare a local variable (of the top-level function so available as closures to the state
// machine) to store the symbol.
var declaration = stateMachineBody.Local(identifier, Js.Null());
// If we have a true symbol associated with the key, then declare it in the base transformer
if (symbol.Symbol != null)
{
transformer.DeclareInCurrentScope(symbol.Symbol, declaration);
}
return(declaration);
}
protected string UniqueName(string identifier)
{
var key = new LiftedVariableKey(identifier);
if (hoistedVariables.ContainsKey(key))
{
identifier = GenerateNewNamePrivate(key);
hoistedVariables[key] = identifier;
}
return(identifier);
}
private string GenerateNewNamePrivate(LiftedVariableKey symbol)
{
var counter = 2;
do
{
var currentName = symbol.Identifier + counter++;
if (!hoistedVariables.ContainsKey(new LiftedVariableKey(SyntaxFactory.Identifier(currentName))))
{
return(currentName);
}
}while (true);
}
public bool Equals(LiftedVariableKey other)
{
return(string.Equals(identifier, other.identifier) && (Equals(symbol, other.symbol) || symbol == null || other.symbol == null));
}