internal static HashSet <Expression> Nominate(Func <Expression, bool> fnCanBeEvaluated, Expression expression)
{
var nominator = new Nominator(fnCanBeEvaluated);
nominator.Visit(expression);
return(nominator.candidates);
}
/// <summary>
/// Performs evaluation and replacement of independent sub-trees
/// </summary>
/// <param name="expression">The root of the expression tree.</param>
/// <param name="fnCanBeEvaluated">A function that decides whether a given expression node can be part of the local function.</param>
/// <param name="fnPostEval">A function to apply to each newly formed <see cref="ConstantExpression"/>.</param>
/// <returns>A new tree with sub-trees evaluated and replaced.</returns>
public static Expression Eval(Expression expression, Func <Expression, bool> fnCanBeEvaluated, Func <ConstantExpression, Expression> fnPostEval)
{
if (fnCanBeEvaluated == null)
{
fnCanBeEvaluated = PartialEvaluator.CanBeEvaluatedLocally;
}
return(SubtreeEvaluator.Eval(Nominator.Nominate(fnCanBeEvaluated, expression), fnPostEval, expression));
}
public static HashSet <Expression> Nominate(Func <Expression, bool> fnCanBeEvaluated, Expression expression)
{
var nominator = new Nominator(fnCanBeEvaluated);
if (nominator != null)
{
nominator.Visit(expression);
}
return(nominator.candidates);
}
/// <summary>
/// Performs evaluation and replacement of independent sub-trees
/// </summary>
/// <param name="expression">The root of the expression tree.</param>
/// <param name="fnCanBeEvaluated">A function that decides whether a given expression node can be part of the local function.</param>
/// <returns>A new tree with sub-trees evaluated and replaced.</returns>
public static Expression Eval(Expression expression, Func <Expression, bool> fnCanBeEvaluated)
{
return(SubtreeEvaluator.Eval(Nominator.Nominate(fnCanBeEvaluated, expression), expression));
}