public SyntaxTree Parse(TokenList tokenList)
{
LRParsingMap parsingMap = GetParsingMap();
RegulationList grammar = GetGrammar();
//TODO:这个convertor以后是可以配置的。
var tokenTypeConvertor = new TokenType2TreeNodeType();
var context = new ParsingContext(tokenList, grammar, parsingMap, tokenTypeConvertor);
while (context.CurrentTokenIndex < context.TokenList.Count + 1)
{
PrintParsingProgress(context);
TreeNodeType nodeType = context.CurrentNodeType();
int stateId = context.StateIdStack.Peek();
LRParsingAction action = parsingMap.GetAction(stateId, nodeType);
int currentTokenIndex = action.Execute(context);
context.CurrentTokenIndex = currentTokenIndex;
}
PrintLastState(context);
if (context.TreeStack.Count > 0)
{
return(context.TreeStack.Peek());
}
else
{
return(new SyntaxTree());
}
}
public ParsingContext(TokenList tokenList,
RegulationList grammar,
LRParsingMap parsingMap,
TokenType2TreeNodeType tokenTypeConvertor)
{
this.StateIdStack = new Stack <int>();
this.StateIdStack.Push(1);
this.TreeStack = new Stack <SyntaxTree>();
this.TokenList = tokenList;
this.Grammar = grammar;
this.ParsingMap = parsingMap;
this.TokenTypeConvertor = tokenTypeConvertor;
}
/// <summary>
/// 用SLR分析法计算分析表
/// </summary>
/// <param name="grammar"></param>
/// <returns></returns>
public static void GetSLRParsingMap(this RegulationList grammar,
out LRParsingMap map,
out LR0StateCollection stateCollection,
out LR0EdgeCollection edgeCollection, TextWriter writer)
{
// 给文法添加一个辅助的开始产生式 S' -> S $
// 如何添加一个外来的结点类型？用Enum是无法做到的。
var decoratedS = new TreeNodeType("__S2", "S'", "<S'>");
var decoratedEnd = TreeNodeType.endOfTokenListNode;
var decoratedRegulation = new Regulation(
decoratedS, grammar[0].Left, decoratedEnd);
var decoratedGrammar = new RegulationList(decoratedRegulation);
decoratedGrammar.AddRange(grammar);
// 初始化T为{ Closure(S' -> S $) }
var firstItem = new LR0Item(decoratedGrammar[0], 0);
var firstState = new LR0State(firstItem);
firstState = decoratedGrammar.Closure(firstState);
stateCollection = new LR0StateCollection(firstState);
edgeCollection = new LR0EdgeCollection(stateCollection);
var queue = new Queue <LR0State>();
queue.Enqueue(firstState);
int lastOutputLength = 0;
int stateListCount = 1;
int queueCount = 1;
while (queue.Count > 0)
{
LR0State fromState = queue.Dequeue(); queueCount--;
int itemIndex = 0;
int itemCount = fromState.Count();
foreach (var item in fromState)
{
{
TextWriter currentWriter = Console.Out;
if (Console.Out != writer)
{
Console.SetOut(writer);
}
for (int i = 0; i < lastOutputLength; i++)
{
Console.Write('\u0008');
}
string output = string.Format("Calculating SLR State List: {0} <-- {1}, working on {2}/{3} ...",
stateListCount, queueCount, 1 + itemIndex++, itemCount);
Console.Write(output);
lastOutputLength = output.Length;
Console.SetOut(currentWriter);
}
TreeNodeType x = item.GetNodeNext2Dot();
if (x == null || x == decoratedEnd)
{
continue;
}
LR0State toState = decoratedGrammar.Goto(fromState, x);
if (stateCollection.TryInsert(toState))
{
queue.Enqueue(toState);
stateListCount++;
queueCount++;
var edge = new LR0Edge(fromState, x, toState);
edgeCollection.TryInsert(edge);
}
else
{
int index = stateCollection.IndexOf(toState);
toState = stateCollection[index];
var edge = new LR0Edge(fromState, x, toState);
edgeCollection.TryInsert(edge);
}
}
}
{
TextWriter currentWriter = Console.Out;
if (Console.Out != writer)
{
Console.SetOut(writer);
}
Console.WriteLine();
Console.SetOut(currentWriter);
}
map = new LRParsingMap();
foreach (var edge in edgeCollection)
{
if (edge.X.IsLeave)
{
int stateId = edge.From.ParsingMapIndex + 1; //stateCollection.IndexOf(edge.From) + 1
int gotoStateId = edge.To.ParsingMapIndex + 1; //stateCollection.IndexOf(edge.To) + 1
map.SetAction(stateId, edge.X, new LR1ShiftInAction(gotoStateId));
}
else
{
int stateId = edge.From.ParsingMapIndex + 1; //stateCollection.IndexOf(edge.From) + 1
int gotoStateId = edge.To.ParsingMapIndex + 1; //stateCollection.IndexOf(edge.To) + 1
map.SetAction(stateId, edge.X, new LR1GotoAction(gotoStateId));
}
}
var endItem = new LR0Item(decoratedRegulation, 1);
FOLLOWCollection followCollection;
decoratedGrammar.GetFollowCollection(out followCollection);
foreach (var state in stateCollection)
{
if (state.Contains(endItem))
{
int stateId = state.ParsingMapIndex + 1;//stateCollection.IndexOf(state) + 1
map.SetAction(stateId, decoratedEnd, new LR1AceptAction());
}
foreach (var lr0Item in state)
{
if (lr0Item.GetNodeNext2Dot() == null)
{
FOLLOW follow = FindFollow(followCollection, lr0Item.Regulation.Left);
foreach (var value in follow.Values)
{
int stateId = state.ParsingMapIndex + 1;// stateCollection.IndexOf(state) + 1;
int reductionId = decoratedGrammar.IndexOf(lr0Item.Regulation);
var action = new LR1ReducitonAction(reductionId);
map.SetAction(stateId, value, action);
}
}
}
}
}
/// <summary>
/// 用LR(1)分析法计算分析表
/// </summary>
/// <param name="grammar"></param>
/// <returns></returns>
public static void GetLR1ParsingMap(this RegulationList grammar,
out LRParsingMap map,
out LR1StateCollection stateCollection,
out LR1EdgeCollection edgeCollection, TextWriter originalOut)
{
// 给文法添加一个辅助的开始产生式 S' -> S $
// 如何添加一个外来的结点类型？用Enum是无法做到的。
var decoratedS = new TreeNodeType("__S2", "S'", "<S'>");
var decoratedEnd = TreeNodeType.endOfTokenListNode;
var decoratedRegulation = new Regulation(
decoratedS, grammar[0].Left, decoratedEnd);
var decoratedGrammar = new RegulationList(decoratedRegulation);
decoratedGrammar.AddRange(grammar);
// 初始化T为{ Closure(S' -> S $) }
var firstItem = new LR1Item(decoratedGrammar[0], 0, decoratedEnd);
var firstState = new SmallerLR1State(firstItem);
Dictionary <TreeNodeType, bool> nullableDict;
decoratedGrammar.GetNullableDict(out nullableDict);
FIRSTCollection firstCollection;
decoratedGrammar.GetFirstCollection(out firstCollection, nullableDict);
firstState = decoratedGrammar.Closure(firstState, nullableDict, firstCollection);
stateCollection = new LR1StateCollection(firstState);
edgeCollection = new LR1EdgeCollection(stateCollection);
var queue = new Queue <SmallerLR1State>();
queue.Enqueue(firstState);
int lastOutputLength = 0;
int stateListCount = 1;
int queueCount = 1;
while (queue.Count > 0)
{
SmallerLR1State fromState = queue.Dequeue(); queueCount--;
int itemIndex = 0;
int groupCount = fromState.GroupCount;
foreach (var group in fromState.GetGroups())
{
{
TextWriter currentWriter = Console.Out;
if (Console.Out != originalOut)
{
Console.SetOut(originalOut);
}
for (int i = 0; i < lastOutputLength; i++)
{
Console.Write('\u0008');
}
string output = string.Format("Calculating LR(1) State List: {0} <-- {1}, working on group {2}/{3} ...",
stateListCount, queueCount, 1 + itemIndex++, groupCount);
Console.Write(output);
lastOutputLength = output.Length;
Console.SetOut(currentWriter);
}
TreeNodeType x = group.Item1.GetNodeNext2Dot();
if (x == null || x == decoratedEnd)
{
continue;
}
SmallerLR1State toState = decoratedGrammar.Goto(fromState, x, nullableDict, firstCollection);
if (stateCollection.TryInsert(toState))//融入组织之中吧
{
int index = stateCollection.IndexOf(toState);
toState = stateCollection[index];
queue.Enqueue(toState);
stateListCount++;
queueCount++;
var edge = new LR1Edge(fromState, x, toState);
edgeCollection.TryInsert(edge);
}
else
{
int index = stateCollection.IndexOf(toState);
toState = stateCollection[index];
var edge = new LR1Edge(fromState, x, toState);
edgeCollection.TryInsert(edge);
}
}
}
{
TextWriter currentWriter = Console.Out;
if (Console.Out != originalOut)
{
Console.SetOut(originalOut);
}
Console.WriteLine();
Console.SetOut(currentWriter);
}
map = new LRParsingMap();
foreach (var edge in edgeCollection)
{
if (edge.X.IsLeave)
{
int stateId = edge.From.ParsingMapIndex + 1; // stateCollection.IndexOf(edge.From) + 1;
int gotoId = edge.To.ParsingMapIndex + 1; //stateCollection.IndexOf(edge.To) + 1
map.SetAction(stateId, edge.X, new LR1ShiftInAction(gotoId));
}
else
{
int stateId = edge.From.ParsingMapIndex + 1; // stateCollection.IndexOf(edge.From) + 1;
int gotoId = edge.To.ParsingMapIndex + 1; //stateCollection.IndexOf(edge.To) + 1
map.SetAction(stateId, edge.X, new LR1GotoAction(gotoId));
}
}
// TODO: not implemented
var endItem = new LR1Item(decoratedRegulation, 1, decoratedEnd);
foreach (var state in stateCollection)
{
if (state.Contains(endItem))
{
int stateId = state.ParsingMapIndex + 1;// stateCollection.IndexOf(state) + 1;
map.SetAction(stateId, decoratedEnd, new LR1AceptAction());
}
foreach (var LR1Item in state)
{
if (LR1Item.GetNodeNext2Dot() == null)
{
int stateId = state.ParsingMapIndex + 1;// stateCollection.IndexOf(state) + 1;
map.SetAction(stateId, LR1Item.LookAheadNodeType,
new LR1ReducitonAction(decoratedGrammar.IndexOf(LR1Item.Regulation)));
}
}
}
}
