/// <summary>
/// Creates a new bottom up rewriter instance with no initial rewrite rule definitions.
/// Collection initializer syntax can be used for the Leaves, Rules, and Fallbacks properties.
/// </summary>
/// <param name="sourceNodeComparer">Equality comparer used to compare source tree nodes during construction of the rule table and during tree matching.</param>
public BottomUpRewriter(IEqualityComparer <TSourceNodeType> sourceNodeComparer)
{
if (sourceNodeComparer == null)
{
throw new ArgumentNullException(nameof(sourceNodeComparer));
}
_wildcardFactory = new TWildcardFactory();
Leaves = new LeafCollection <TSource, TTarget>();
Leaves.Added += OnLeafAdded;
Rules = new RuleCollection <TSource, TTarget>();
Rules.Added += OnRuleAdded;
Fallbacks = new FallbackCollection <TSource, TTarget>();
Fallbacks.Added += OnFallbackAdded;
_forest = new Dictionary <TSource, int>();
_wildcards = new Dictionary <TSource, int>(new EqualityComparerByType <TSource>());
_constants = new Dictionary <TSource, int>();
_states = new Dictionary <TSourceNodeType, NAryMap <int, int> >(sourceNodeComparer);
_leafTests = new Dictionary <Func <TSource, bool>, int>();
_fallbackTests = new Dictionary <Func <TSource, bool>, int>();
_finals = new Dictionary <int, RuleBase <TSource, TTarget> >();
}
internal ExpressionRewriterFallbackCollection(FallbackCollection <ExpressionTreeBase, TTarget> fallbacks) => _fallbacks = fallbacks;