/// <summary>
/// Converts the given GD into preconditions. A root AND-expression is split into a list of precondition expressions.
/// </summary>
/// <param name="gdAstNode">AST node.</param>
/// <returns>Converted preconditions.</returns>
public static Preconditions ToPreconditions(GdAstNode gdAstNode)
{
Preconditions preconditions = new Preconditions();
Expression expression = ToExpression(gdAstNode);
var andExpression = expression as AndExpression;
if (andExpression != null)
{
preconditions.AddRange(andExpression.Arguments);
}
else if (expression != null)
{
preconditions.Add(expression);
}
return(preconditions);
}