/// <summary>
/// Compiles from strings (see Compile for more details)
/// </summary>
/// <param name="func"></param>
/// <param name="variables"></param>
/// <returns></returns>
internal static FastExpression Compile(Entity func, params string[] variables)
{
var varNamespace = new Dictionary <string, int>();
int id = 0;
foreach (var varName in variables)
{
varNamespace[varName] = id;
id++;
}
func = func.SubstituteConstants();
var res = new FastExpression(variables.Length, func);
func.UpdateHash(); // Count hash for O(N)
Entity.HashOccurancesUpdate(func); // Update occurances for each node for O(N) instead of O(N^2)
InnerCompile(func, res, variables, varNamespace);
res.Seal(); // Creates stack
return(res);
}