public static void GetFirstCollection(
this RegulationList grammar,
out FIRSTCollection firstCollection, Dictionary <TreeNodeType, bool> nullableDict = null)
{
if (nullableDict == null)
{
GetNullableDict(grammar, out nullableDict);
}
FIRSTCollection firstList4Node;
grammar.GetFirstCollection4Node(out firstList4Node, nullableDict);
FIRSTCollection firstList4Regulation;
grammar.GetFirstCollection4Regulation(out firstList4Regulation,
nullableDict, firstList4Node);
firstCollection = new FIRSTCollection();
foreach (var item in firstList4Node)
{
firstCollection.TryInsert(item);
}
foreach (var item in firstList4Regulation)
{
firstCollection.TryInsert(item);
}
}
/// <summary>
/// 计算文法的FIRST和FOLLOW集
/// </summary>
/// <param name="grammar"></param>
/// <returns></returns>
public static FirstListAndFollowList GetFirstListAndFollowList(this RegulationList grammar)
{
Dictionary <TreeNodeType, bool> nullableDict = new Dictionary <TreeNodeType, bool>();
GetNullableDict(grammar, out nullableDict);
FIRSTCollection firstCollection4Node;
grammar.GetFirstCollection4Node(out firstCollection4Node, nullableDict);
FIRSTCollection firstCollection4Regulation;
grammar.GetFirstCollection4Regulation(out firstCollection4Regulation, nullableDict, firstCollection4Node);
FOLLOWCollection followCollection;
grammar.GetFollowCollection(out followCollection, nullableDict, firstCollection4Node);
var firstCollection = new FIRSTCollection();
foreach (var item in firstCollection4Node)
{
firstCollection.TryInsert(item);
}
foreach (var item in firstCollection4Regulation)
{
firstCollection.TryInsert(item);
}
return(new FirstListAndFollowList(firstCollection, followCollection));
}
public static void GetFollowCollection(
this RegulationList grammar,
out FOLLOWCollection followCollection,
Dictionary <TreeNodeType, bool> nullableDict = null,
FIRSTCollection firstCollection = null)
{
if (nullableDict == null)
{
grammar.GetNullableDict(out nullableDict);
}
if (firstCollection == null)
{
grammar.GetFirstCollection(out firstCollection, nullableDict);
}
FIRSTCollection firstList4Node;
grammar.GetFirstCollection4Node(out firstList4Node, nullableDict);
FIRSTCollection firstList4Regulation;
grammar.GetFirstCollection4Regulation(out firstList4Regulation, nullableDict, firstList4Node);
grammar.DoGetFollowList(out followCollection, nullableDict, firstList4Node);
}