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ParserGenerator.cs
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ParserGenerator.cs
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/*
Copyright (C) 2019. rollrat All Rights Reserved.
Author: Jeong HyunJun
*/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ParserGenerator
{
#region Parser Production
public class ParserAction
{
public Action<ParsingTree.ParsingTreeNode> SemanticAction;
public static ParserAction Create(Action<ParsingTree.ParsingTreeNode> action)
=> new ParserAction { SemanticAction = action };
public Action<LPModule, LPFunction, LPBasicBlock, ParsingTree.ParsingTreeNode> TravelAction;
public static ParserAction Create(Action<LPModule, LPFunction, LPBasicBlock, ParsingTree.ParsingTreeNode> action)
=> new ParserAction { TravelAction = action };
}
public class ParserProduction
{
public int index;
public string production_name;
public bool isterminal;
public List<ParserProduction> contents = new List<ParserProduction>();
public List<List<ParserProduction>> sub_productions = new List<List<ParserProduction>>();
public List<ParserAction> temp_actions = new List<ParserAction>();
public List<ParserAction> actions = new List<ParserAction>();
ParserGenerator parent;
public ParserProduction(ParserGenerator parent) { this.parent = parent; }
public static ParserProduction operator +(ParserProduction p1, ParserProduction p2)
{
p1.contents.Add(p2);
return p1;
}
public static ParserProduction operator +(ParserProduction pp, ParserAction ac)
{
pp.temp_actions.Add(ac);
return pp;
}
public static ParserProduction operator +(ParserProduction pp, string name)
{
pp.contents.Add(pp.parent.TryCreateNewProduction(name));
return pp;
}
public static ParserProduction operator +(string name, ParserProduction pp)
{
var p = pp.parent.TryCreateNewProduction(name);
p.contents.Add(pp);
return p;
}
public static ParserProduction operator |(ParserProduction p1, ParserProduction p2)
{
p2.contents.Insert(0, p2);
p1.sub_productions.Add(new List<ParserProduction>(p2.contents));
p1.actions.AddRange(p2.temp_actions);
p2.temp_actions.Clear();
p2.contents.Clear();
return p1;
}
public static ParserProduction operator |(ParserProduction p1, string pt2)
{
var p2 = p1.parent.TryCreateNewProduction(pt2);
p2.contents.Insert(0, p2);
p1.sub_productions.Add(new List<ParserProduction>(p2.contents));
p1.actions.AddRange(p2.temp_actions);
p2.temp_actions.Clear();
p2.contents.Clear();
return p1;
}
#if false
public static ParserProduction operator +(ParserProduction p1, string p2)
{
p1.contents.Add(new ParserProduction { isterminal = true, token_specific = p2 });
return p1;
}
public static ParserProduction operator|(ParserProduction p1, string p2)
{
p1.sub_productions.Add(new List<ParserProduction> { p1, new ParserProduction { isterminal = true, token_specific = p2 } });
return p1;
}
#endif
}
#endregion
/// <summary>
/// LR Parser Generator
/// </summary>
public class ParserGenerator
{
List<ParserProduction> production_rules;
Dictionary<string, ParserProduction> production_dict;
// (production_index, (priority, is_left_associativity?))
Dictionary<int, Tuple<int, bool>> shift_reduce_conflict_solve;
// (production_index, (sub_production_index, (priority, is_left_associativity?)))
Dictionary<int, Dictionary<int, Tuple<int, bool>>> shift_reduce_conflict_solve_with_production_rule;
public StringBuilder GlobalPrinter = new StringBuilder();
public readonly static ParserProduction EmptyString = new ParserProduction(null) { index = -2 };
public ParserGenerator()
{
production_rules = new List<ParserProduction>();
production_rules.Add(new ParserProduction(this) { index = 0, production_name = "S'" });
production_dict = new Dictionary<string, ParserProduction>();
production_dict.Add("S'", production_rules[0]);
shift_reduce_conflict_solve = new Dictionary<int, Tuple<int, bool>>();
shift_reduce_conflict_solve_with_production_rule = new Dictionary<int, Dictionary<int, Tuple<int, bool>>>();
}
#region Parser Generating Helper
public ParserProduction CreateNewProduction(string name = "", bool is_terminal = true)
{
var pp = new ParserProduction(this) { index = production_rules.Count, production_name = name, isterminal = is_terminal };
if (production_dict.ContainsKey(name))
throw new Exception(name + " is already exsits production!");
production_dict.Add(name, pp);
production_rules.Add(pp);
return pp;
}
public ParserProduction TryCreateNewProduction(string name = "", bool is_terminal = true)
{
if (production_dict.ContainsKey(name))
return production_dict[name];
var pp = new ParserProduction(this) { index = production_rules.Count, production_name = name, isterminal = is_terminal };
production_dict.Add(name, pp);
production_rules.Add(pp);
return pp;
}
/// <summary>
/// A -> B (C D)*
/// =>
/// A -> B CD'
/// CD' -> C D CD'1 { S.add(CD'1) }
/// CD' -> e
/// </summary>
/// <param name="pp"></param>
/// <returns></returns>
public ParserProduction TryCreateZeroOrMoreProduction(ParserProduction pp)
{
pp.contents.Insert(0, pp);
var pp_name = ("zeroormore" + string.Join(",", pp.contents.Select(x => $"{x.index}:{x.production_name}"))).GetHashSHA1();
if (production_dict.ContainsKey(pp_name))
{
pp.contents.Clear();
return production_dict[pp_name];
}
var nt = CreateNewProduction(pp_name);
var nn = new List<ParserProduction>(pp.contents);
nn.Add(nt);
nt.sub_productions.Add(nn);
nt.sub_productions.Add(new List<ParserProduction> { EmptyString });
nt.actions.Add(ParserAction.Create((x) =>
{
var lx = new List<List<ParsingTree.ParsingTreeNode>>();
var ll = new List<ParsingTree.ParsingTreeNode>();
if (x.Childs.Count > 0)
{
for (int i = 0; i < x.Childs.Count - 1; i++)
ll.Add(x.Childs[i]);
lx.Add(ll);
}
if (x.Childs.Last().UserContents != null)
lx.AddRange(x.Childs.Last().UserContents as List<List<ParsingTree.ParsingTreeNode>>);
x.UserContents = lx;
}));
pp.contents.Clear();
return nt;
}
/// <summary>
/// A -> B (C D)+
/// =>
/// A -> B CD'
/// CD' -> C D CD'1 { S.add(CD'1) }
/// CD' -> C D { S.add({C D}) }
/// </summary>
/// <param name="pp"></param>
/// <returns></returns>
public ParserProduction TryCreateOneOrMoreProduction(ParserProduction pp)
{
pp.contents.Insert(0, pp);
var pp_name = ("oneormore" + string.Join(",", pp.contents.Select(x => $"{x.index}:{x.production_name}"))).GetHashSHA1();
if (production_dict.ContainsKey(pp_name))
{
pp.contents.Clear();
return production_dict[pp_name];
}
var nt = CreateNewProduction(pp_name);
var nn = new List<ParserProduction>(pp.contents);
nn.Add(nt);
nt.sub_productions.Add(nn);
nt.sub_productions.Add(new List<ParserProduction>(pp.contents));
nt.actions.Add(ParserAction.Create((x) =>
{
var lx = new List<List<ParsingTree.ParsingTreeNode>>();
var ll = new List<ParsingTree.ParsingTreeNode>();
for (int i = 0; i < x.Childs.Count - 1; i++)
ll.Add(x.Childs[i]);
lx.Add(ll);
if (x.Childs.Last().UserContents != null)
lx.AddRange(x.Childs.Last().UserContents as List<List<ParsingTree.ParsingTreeNode>>);
x.UserContents = lx;
}));
nt.actions.Add(ParserAction.Create((x) =>
{
var lx = new List<List<ParsingTree.ParsingTreeNode>>();
lx.Add(x.Childs);
x.UserContents = lx;
}));
pp.contents.Clear();
return nt;
}
/// <summary>
/// A -> B (C D)?
/// =>
/// A -> B CD'
/// CD' -> C D
/// CD' -> e
/// </summary>
/// <param name="pp"></param>
/// <returns></returns>
public ParserProduction TryCreateZeroOrOneProduction(ParserProduction pp)
{
pp.contents.Insert(0, pp);
var pp_name = ("zeroorone" + string.Join(",", pp.contents.Select(x => $"{x.index}:{x.production_name}"))).GetHashSHA1();
if (production_dict.ContainsKey(pp_name))
{
pp.contents.Clear();
return production_dict[pp_name];
}
var nt = CreateNewProduction(pp_name);
nt.sub_productions.Add(new List<ParserProduction>(pp.contents));
nt.sub_productions.Add(new List<ParserProduction> { EmptyString });
pp.contents.Clear();
return nt;
}
public void PushStarts(ParserProduction pp)
{
// Augment stats node
production_rules[0].sub_productions.Add(new List<ParserProduction> { pp });
}
/// <summary>
/// 터미널들의 Shift-Reduce Conflict solve 정보를 넣습니다.
/// </summary>
/// <param name="left"></param>
/// <param name="terminals"></param>
public void PushConflictSolver(bool left, params ParserProduction[] terminals)
{
var priority = shift_reduce_conflict_solve.Count + shift_reduce_conflict_solve_with_production_rule.Count;
foreach (var pp in terminals)
shift_reduce_conflict_solve.Add(pp.index, new Tuple<int, bool>(priority, left));
}
/// <summary>
/// 논터미널들의 Shift-Reduce Conflict solve 정보를 넣습니다.
/// </summary>
/// <param name="left"></param>
/// <param name="no"></param>
public void PushConflictSolver(bool left, params Tuple<ParserProduction, int>[] no)
{
var priority = shift_reduce_conflict_solve.Count + shift_reduce_conflict_solve_with_production_rule.Count;
foreach (var ppi in no)
{
if (!shift_reduce_conflict_solve_with_production_rule.ContainsKey(ppi.Item1.index))
shift_reduce_conflict_solve_with_production_rule.Add(ppi.Item1.index, new Dictionary<int, Tuple<int, bool>>());
shift_reduce_conflict_solve_with_production_rule[ppi.Item1.index].Add(ppi.Item2, new Tuple<int, bool>(priority, left));
}
}
#endregion
#region Simple ParserDescription Parser
/// <summary>
/// 문자열로부터 ParserGenerator를 가져옵니다.
/// </summary>
/// <param name="nt_syms">논터미널 심볼</param>
/// <param name="t_syms">터미널 심볼</param>
/// <param name="production_rules">프로덕션 룰</param>
/// <param name="sr_rules">Shift Reduce 규칙</param>
/// <returns></returns>
public static ParserGenerator GetGenerator(string[] nt_syms, Tuple<string, string>[] t_syms, string[] production_rules, string[] sr_rules)
{
var gen = new ParserGenerator();
var non_terminals = new Dictionary<string, ParserProduction>();
var terminals = new Dictionary<string, ParserProduction>();
terminals.Add("''", EmptyString);
foreach (var nt in nt_syms)
non_terminals.Add(nt.Trim(), gen.CreateNewProduction(nt.Trim(), false));
foreach (var t in t_syms)
{
var name = t.Item1;
var pp = t.Item2;
terminals.Add(pp, gen.CreateNewProduction(name.Trim()));
}
var prec = new Dictionary<string, List<Tuple<ParserProduction, int>>>();
foreach (var pp in production_rules)
{
if (pp.Trim() == "") continue;
var split = pp.Split(new[] { "->" }, StringSplitOptions.None);
var left = split[0].Trim();
var right = split[1].Split(' ');
var prlist = new List<ParserProduction>();
bool stay_prec = false;
foreach (var ntt in right)
{
if (string.IsNullOrEmpty(ntt)) continue;
if (ntt == "%prec") { stay_prec = true; continue; }
if (stay_prec)
{
if (!prec.ContainsKey(ntt))
prec.Add(ntt, new List<Tuple<ParserProduction, int>>());
prec[ntt].Add(new Tuple<ParserProduction, int>(non_terminals[left], non_terminals[left].sub_productions.Count));
continue;
}
if (non_terminals.ContainsKey(ntt))
prlist.Add(non_terminals[ntt]);
else if (terminals.ContainsKey(ntt))
prlist.Add(terminals[ntt]);
else
throw new Exception($"Production rule build error!\r\n{ntt} is neither non-terminal nor terminal!\r\nDeclare the token-name!");
}
non_terminals[left].sub_productions.Add(prlist);
}
for (int i = sr_rules.Length - 1; i >= 0; i--)
{
var line = sr_rules[i].Trim();
if (line == "") continue;
var tt = line.Split(' ')[0];
var rr = line.Substring(tt.Length).Trim().Split(',');
var left = true;
var items1 = new List<Tuple<ParserProduction, int>>();
var items2 = new List<ParserProduction>();
if (tt == "%right") left = false;
foreach (var ii in rr.Select(x => x.Trim()))
{
if (string.IsNullOrEmpty(ii)) continue;
if (terminals.ContainsKey(ii))
items2.Add(terminals[ii]);
else if (prec.ContainsKey(ii))
items1.AddRange(prec[ii]);
else
throw new Exception($"Production rule build error!\r\n{ii} is neither non-terminal nor terminal!\r\nDeclare the token-name!");
}
if (items1.Count > 0)
gen.PushConflictSolver(left, items1.ToArray());
else
gen.PushConflictSolver(left, items2.ToArray());
}
gen.PushStarts(non_terminals[nt_syms[0]]);
return gen;
}
#endregion
#region String Hash Function
// 원래 해시가 아니라 set로 구현해야하는게 일반적임
// 집합끼리의 비교연산, 일치여부 교집합을 구해 좀 더 최적화가능하지만 귀찮으니 string-hash를 쓰도록한다.
//
// # 2019-07-15
// 확인결과 별도의 클래스를 만들어 set를 관리하는 것보다 string-hash가 더 빠르다
// JSParserGenetor의 경우 set의 경우 13초, string-hash의 경우 11초로 string-hash가 더 빠른 속도를 내었다.
// set은 dictionary에서사용하는 GetHashCode 및 Equals 함수와, state의 kernel을 고려하여 만든 클래스였다.
private string t2s(Tuple<int, int, int> t)
{
return $"{t.Item1},{t.Item2},{t.Item3}";
}
private string t2s(Tuple<int, int, int, HashSet<int>> t)
{
var list = t.Item4.ToList();
list.Sort();
return $"{t.Item1},{t.Item2},{t.Item3},({string.Join(",", list)})";
}
private string l2s(List<Tuple<int, int, int>> h)
{
var list = h.ToList();
list.Sort();
return string.Join(",", list.Select(x => $"({x.Item1},{x.Item2},{x.Item3})"));
}
private string l2s(List<Tuple<int, int, int, HashSet<int>>> h)
{
var list = new List<Tuple<int, int, int, List<int>>>();
foreach (var tt in h)
{
var ll = tt.Item4.ToList();
ll.Sort();
list.Add(new Tuple<int, int, int, List<int>>(tt.Item1, tt.Item2, tt.Item3, ll));
}
list.Sort();
return string.Join(",", list.Select(x => $"({x.Item1},{x.Item2},{x.Item3},({(string.Join("/", x.Item4))}))"));
}
private static string l2sl(List<Tuple<int, int, int, HashSet<int>>> h, int kernel_cnt)
{
var list = new List<Tuple<int, int, int>>();
var builder = new StringBuilder();
for (int i = 0; i < kernel_cnt; i++)
list.Add(new Tuple<int, int, int>(h[i].Item1, h[i].Item2, h[i].Item3));
list.Sort();
return string.Join(",", list.Select(x => $"({x.Item1},{x.Item2},{x.Item3})"));
}
private string i2s(int a, int b, int c)
{
return $"{a},{b},{c}";
}
#endregion
#region Debug Printer
private void print_hs(List<HashSet<int>> lhs, string prefix)
{
for (int i = 0; i < lhs.Count; i++)
if (lhs[i].Count > 0)
GlobalPrinter.Append(
$"{prefix}({production_rules[i].production_name})={{{string.Join(",", lhs[i].ToList().Select(x => x == -1 ? "$" : production_rules[x].production_name))}}}\r\n");
}
private void print_header(string head_text)
{
GlobalPrinter.Append("\r\n" + new string('=', 50) + "\r\n\r\n");
int spaces = 50 - head_text.Length;
int padLeft = spaces / 2 + head_text.Length;
GlobalPrinter.Append(head_text.PadLeft(padLeft).PadRight(50));
GlobalPrinter.Append("\r\n\r\n" + new string('=', 50) + "\r\n");
}
private void print_states(int state, List<Tuple<int, int, int, HashSet<int>>> items)
{
var builder = new StringBuilder();
builder.Append("-----" + "I" + state + "-----\r\n");
foreach (var item in items)
{
builder.Append($"{production_rules[item.Item1].production_name.ToString().PadLeft(10)} -> ");
var builder2 = new StringBuilder();
for (int i = 0; i < production_rules[item.Item1].sub_productions[item.Item2].Count; i++)
{
if (i == item.Item3)
builder2.Append("·");
builder2.Append(production_rules[item.Item1].sub_productions[item.Item2][i].production_name + " ");
if (item.Item3 == production_rules[item.Item1].sub_productions[item.Item2].Count && i == item.Item3 - 1)
builder2.Append("·");
}
builder.Append(builder2.ToString().PadRight(30));
builder.Append($"{string.Join("/", item.Item4.ToList().Select(x => x == -1 ? "$" : production_rules[x].production_name))}\r\n");
}
GlobalPrinter.Append(builder.ToString());
}
private void print_merged_states(int state, List<Tuple<int, int, int, HashSet<int>>> items, List<List<List<int>>> external_gotos)
{
var builder = new StringBuilder();
builder.Append("-----" + "I" + state + "-----\r\n");
for (int j = 0; j < items.Count; j++)
{
var item = items[j];
builder.Append($"{production_rules[item.Item1].production_name.ToString().PadLeft(10)} -> ");
var builder2 = new StringBuilder();
for (int i = 0; i < production_rules[item.Item1].sub_productions[item.Item2].Count; i++)
{
if (i == item.Item3)
builder2.Append("·");
builder2.Append(production_rules[item.Item1].sub_productions[item.Item2][i].production_name + " ");
if (item.Item3 == production_rules[item.Item1].sub_productions[item.Item2].Count && i == item.Item3 - 1)
builder2.Append("·");
}
builder.Append(builder2.ToString().PadRight(30));
builder.Append($"[{string.Join("/", item.Item4.ToList().Select(x => x == -1 ? "$" : production_rules[x].production_name))}] ");
for (int i = 0; i < external_gotos.Count; i++)
builder.Append($"[{string.Join("/", external_gotos[i][j].ToList().Select(x => x == -1 ? "$" : production_rules[x].production_name))}] ");
builder.Append("\r\n");
}
GlobalPrinter.Append(builder.ToString());
}
#endregion
int number_of_states = -1;
Dictionary<int, List<Tuple<int, int>>> shift_info;
Dictionary<int, List<Tuple<int, int, int>>> reduce_info;
#region SLR Generator
/// <summary>
/// Generate SimpleLR Table
/// </summary>
public void Generate()
{
// --------------- Expand EmptyString ---------------
for (int i = 0; i < production_rules.Count; i++)
if (!production_rules[i].isterminal)
for (int j = 0; j < production_rules[i].sub_productions.Count; j++)
if (production_rules[i].sub_productions[j][0].index == EmptyString.index)
{
production_rules[i].sub_productions.RemoveAt(j--);
for (int ii = 0; ii < production_rules.Count; ii++)
if (!production_rules[ii].isterminal)
for (int jj = 0; jj < production_rules[ii].sub_productions.Count; jj++)
for (int kk = 0; kk < production_rules[ii].sub_productions[jj].Count; kk++)
if (production_rules[ii].sub_productions[jj][kk].index == production_rules[i].index)
{
var ll = new List<ParserProduction>(production_rules[ii].sub_productions[jj]);
ll.RemoveAt(kk);
production_rules[ii].sub_productions.Add(ll);
}
}
// --------------------------------------------------
// --------------- Collect FIRST,FOLLOW Set ---------------
var FIRST = new List<HashSet<int>>();
foreach (var rule in production_rules)
FIRST.Add(first_terminals(rule.index));
var FOLLOW = follow_terminals(FIRST);
#if true
print_header("FISRT, FOLLOW SETS");
print_hs(FIRST, "FIRST");
print_hs(FOLLOW, "FOLLOW");
#endif
// --------------------------------------------------------
// (state_index, (production_rule_index, sub_productions_pos, dot_position)
var states = new Dictionary<int, List<Tuple<int, int, int>>>();
// (state_specify, state_index)
var state_index = new Dictionary<string, int>();
// (state_index, (reduce_what, state_index))
shift_info = new Dictionary<int, List<Tuple<int, int>>>();
// (state_index, (shift_what, production_rule_index, sub_productions_pos))
reduce_info = new Dictionary<int, List<Tuple<int, int, int>>>();
var index_count = 0;
// -------------------- Put first eater -------------------
var first_l = first_nonterminals(0);
state_index.Add(l2s(first_l), 0);
states.Add(0, first_l);
// --------------------------------------------------------
// Create all LR states
// (states)
var q = new Queue<int>();
q.Enqueue(index_count++);
while (q.Count != 0)
{
var p = q.Dequeue();
// Collect goto
// (state_index, (production_rule_index, sub_productions_pos, dot_position))
var gotos = new Dictionary<int, List<Tuple<int, int, int>>>();
foreach (var transition in states[p])
if (production_rules[transition.Item1].sub_productions[transition.Item2].Count > transition.Item3)
{
var pi = production_rules[transition.Item1].sub_productions[transition.Item2][transition.Item3].index;
if (!gotos.ContainsKey(pi))
gotos.Add(pi, new List<Tuple<int, int, int>>());
gotos[pi].Add(new Tuple<int, int, int>(transition.Item1, transition.Item2, transition.Item3 + 1));
}
// Populate empty-string closure
foreach (var goto_unit in gotos)
{
var set = new HashSet<string>();
// Push exists transitions
foreach (var psd in goto_unit.Value)
set.Add(t2s(psd));
// Find all transitions
var new_trans = new List<Tuple<int, int, int>>();
foreach (var psd in goto_unit.Value)
{
if (production_rules[psd.Item1].sub_productions[psd.Item2].Count == psd.Item3) continue;
if (production_rules[psd.Item1].sub_productions[psd.Item2][psd.Item3].isterminal) continue;
var first_nt = first_nonterminals(production_rules[psd.Item1].sub_productions[psd.Item2][psd.Item3].index);
foreach (var nts in first_nt)
if (!set.Contains(t2s(nts)))
{
new_trans.Add(nts);
set.Add(t2s(nts));
}
}
goto_unit.Value.AddRange(new_trans);
}
// Build shift transitions ignore terminal, non-terminal
foreach (var pp in gotos)
{
var hash = l2s(pp.Value);
if (!state_index.ContainsKey(hash))
{
states.Add(index_count, pp.Value);
state_index.Add(hash, index_count);
q.Enqueue(index_count++);
}
var index = state_index[hash];
if (!shift_info.ContainsKey(p))
shift_info.Add(p, new List<Tuple<int, int>>());
shift_info[p].Add(new Tuple<int, int>(pp.Key, index));
}
// Check require reduce and build reduce transitions
foreach (var transition in states[p])
if (production_rules[transition.Item1].sub_productions[transition.Item2].Count == transition.Item3)
{
if (!reduce_info.ContainsKey(p))
reduce_info.Add(p, new List<Tuple<int, int, int>>());
foreach (var term in FOLLOW[transition.Item1])
reduce_info[p].Add(new Tuple<int, int, int>(term, transition.Item1, transition.Item2));
}
}
number_of_states = states.Count;
}
#endregion
#region LR(1) Generator
/// <summary>
/// Generate LR(1) Table
///
/// There is a lookahead propagation error while trying to get the LR(1) item, and it is under review.
/// Don't use this function
/// </summary>
public void GenerateLR1()
{
// --------------- Delete EmptyString ---------------
for (int i = 0; i < production_rules.Count; i++)
if (!production_rules[i].isterminal)
for (int j = 0; j < production_rules[i].sub_productions.Count; j++)
if (production_rules[i].sub_productions[j][0].index == EmptyString.index)
production_rules[i].sub_productions[j].Clear();
// --------------------------------------------------
// --------------- Collect FIRST,FOLLOW Set ---------------
var FIRST = new List<HashSet<int>>();
foreach (var rule in production_rules)
FIRST.Add(first_terminals(rule.index));
var FOLLOW = follow_terminals(FIRST);
#if true
print_header("FISRT, FOLLOW SETS");
print_hs(FIRST, "FIRST");
print_hs(FOLLOW, "FOLLOW");
#endif
// --------------------------------------------------------
// (state_index, (production_rule_index, sub_productions_pos, dot_position, (lookahead))
var states = new Dictionary<int, List<Tuple<int, int, int, HashSet<int>>>>();
// (state_specify, state_index)
var state_index = new Dictionary<string, int>();
var goto_table = new List<Tuple<int, List<Tuple<int, int>>>>();
// (state_index, (reduce_what, state_index))
shift_info = new Dictionary<int, List<Tuple<int, int>>>();
// (state_index, (shift_what, production_rule_index, sub_productions_pos))
reduce_info = new Dictionary<int, List<Tuple<int, int, int>>>();
var index_count = 0;
// -------------------- Put first eater -------------------
var first_l = first_with_lookahead(0, 0, 0, new HashSet<int>());
state_index.Add(l2s(first_l), 0);
states.Add(0, first_l);
// --------------------------------------------------------
// Create all LR states
// (states)
var q = new Queue<int>();
q.Enqueue(index_count++);
while (q.Count != 0)
{
var p = q.Dequeue();
// Collect goto
// (state_index, (production_rule_index, sub_productions_pos, dot_position, lookahead))
var gotos = new Dictionary<int, List<Tuple<int, int, int, HashSet<int>>>>();
foreach (var transition in states[p])
if (production_rules[transition.Item1].sub_productions[transition.Item2].Count > transition.Item3)
{
var pi = production_rules[transition.Item1].sub_productions[transition.Item2][transition.Item3].index;
if (!gotos.ContainsKey(pi))
gotos.Add(pi, new List<Tuple<int, int, int, HashSet<int>>>());
gotos[pi].Add(new Tuple<int, int, int, HashSet<int>>(transition.Item1, transition.Item2, transition.Item3 + 1, transition.Item4));
}
// Populate empty-string closure
foreach (var goto_unit in gotos)
{
var set = new HashSet<string>();
// Push exists transitions
foreach (var psd in goto_unit.Value)
set.Add(t2s(psd));
// Find all transitions
var new_trans = new List<Tuple<int, int, int, HashSet<int>>>();
var trans_dic = new Dictionary<string, int>();
foreach (var psd in goto_unit.Value)
{
if (production_rules[psd.Item1].sub_productions[psd.Item2].Count == psd.Item3) continue;
if (production_rules[psd.Item1].sub_productions[psd.Item2][psd.Item3].isterminal) continue;
var first_nt = first_with_lookahead(psd.Item1, psd.Item2, psd.Item3, psd.Item4);
foreach (var nts in first_nt)
if (!set.Contains(t2s(nts)))
{
var ts = t2s(new Tuple<int, int, int>(nts.Item1, nts.Item2, nts.Item3));
if (trans_dic.ContainsKey(ts))
{
nts.Item4.ToList().ForEach(x => new_trans[trans_dic[ts]].Item4.Add(x));
}
else
{
trans_dic.Add(ts, new_trans.Count);
new_trans.Add(nts);
set.Add(t2s(nts));
}
}
}
goto_unit.Value.AddRange(new_trans);
}
//// Build shift transitions ignore terminal, non-terminal
//foreach (var pp in gotos)
//{
// var hash = l2s(pp.Value);
// if (!state_index.ContainsKey(hash))
// {
// states.Add(index_count, pp.Value);
// state_index.Add(hash, index_count);
// q.Enqueue(index_count++);
// }
// var index = state_index[hash];
//
// if (!shift_info.ContainsKey(p))
// shift_info.Add(p, new List<Tuple<int, int>>());
// shift_info[p].Add(new Tuple<int, int>(pp.Key, index));
//}
//
//// Check require reduce and build reduce transitions
//foreach (var transition in states[p])
// if (production_rules[transition.Item1].sub_productions[transition.Item2].Count == transition.Item3)
// {
// if (!reduce_info.ContainsKey(p))
// reduce_info.Add(p, new List<Tuple<int, int, int>>());
// foreach (var term in transition.Item4)
// reduce_info[p].Add(new Tuple<int, int, int>(term, transition.Item1, transition.Item2));
// }
// Build goto transitions ignore terminal, non-terminal anywhere
var index_list = new List<Tuple<int, int>>();
foreach (var pp in gotos)
{
var hash = l2s(pp.Value);
if (!state_index.ContainsKey(hash))
{
states.Add(index_count, pp.Value);
state_index.Add(hash, index_count);
q.Enqueue(index_count++);
}
index_list.Add(new Tuple<int, int>(pp.Key, state_index[hash]));
}
goto_table.Add(new Tuple<int, List<Tuple<int, int>>>(p, index_list));
}
var occurred_conflict = false;
// ------------- Find Shift-Reduce Conflict ------------
foreach (var ms in states)
{
// (shift_what, state_index)
var small_shift_info = new List<Tuple<int, int>>();
// (reduce_what, production_rule_index, sub_productions_pos)
var small_reduce_info = new List<Tuple<int, int, int>>();
// Fill Shift Info
foreach (var pp in goto_table[ms.Key].Item2)
small_shift_info.Add(new Tuple<int, int>(pp.Item1, pp.Item2));
// Fill Reduce Info
foreach (var transition in ms.Value)
if (production_rules[transition.Item1].sub_productions[transition.Item2].Count == transition.Item3)
{
foreach (var term in transition.Item4)
small_reduce_info.Add(new Tuple<int, int, int>(term, transition.Item1, transition.Item2));
}
// Conflict Check
// (shift_what, small_shift_info_index)
var shift_tokens = new Dictionary<int, int>();
for (int i = 0; i < small_shift_info.Count; i++)
shift_tokens.Add(small_shift_info[i].Item1, i);
var completes = new HashSet<int>();
foreach (var tuple in small_reduce_info)
{
if (completes.Contains(tuple.Item1))
{
// It's already added so do not have to work anymore.
continue;
}
if (shift_tokens.ContainsKey(tuple.Item1))
{
#if true
print_header("SHIFT-REDUCE CONFLICTS");
GlobalPrinter.Append($"Shift-Reduce Conflict! {(tuple.Item1 == -1 ? "$" : production_rules[tuple.Item1].production_name)}\r\n");
GlobalPrinter.Append($"States: {ms.Key} {small_shift_info[shift_tokens[tuple.Item1]].Item2}\r\n");
print_states(ms.Key, states[ms.Key]);
print_states(small_shift_info[shift_tokens[tuple.Item1]].Item2, states[small_shift_info[shift_tokens[tuple.Item1]].Item2]);
#endif
Tuple<int, bool> p1 = null, p2 = null;
try
{
var pp = get_first_on_right_terminal(production_rules[tuple.Item2], tuple.Item3);
if (shift_reduce_conflict_solve.ContainsKey(pp.index))
p1 = shift_reduce_conflict_solve[pp.index];
}
catch (Exception e)
{
GlobalPrinter.Append(e.Message + "\r\n");
}
if (shift_reduce_conflict_solve.ContainsKey(tuple.Item1))
p2 = shift_reduce_conflict_solve[tuple.Item1];
if (shift_reduce_conflict_solve_with_production_rule.ContainsKey(tuple.Item2))
if (shift_reduce_conflict_solve_with_production_rule[tuple.Item2].ContainsKey(tuple.Item3))
p1 = shift_reduce_conflict_solve_with_production_rule[tuple.Item2][tuple.Item3];
//if (shift_reduce_conflict_solve_with_production_rule.ContainsKey(states[tuple.Item1][0].Item1))
// if (shift_reduce_conflict_solve_with_production_rule[states[tuple.Item1][0].Item1].ContainsKey(states[tuple.Item1][0].Item2))
// p2 = shift_reduce_conflict_solve_with_production_rule[states[tuple.Item1][0].Item1][states[tuple.Item1][0].Item2];
if (p1 == null || p2 == null)
{
occurred_conflict = true;
continue;
}
if (p1.Item1 < p2.Item1 || (p1.Item1 == p2.Item1 && p1.Item2))
{
// Reduce
if (!reduce_info.ContainsKey(ms.Key))
reduce_info.Add(ms.Key, new List<Tuple<int, int, int>>());
reduce_info[ms.Key].Add(new Tuple<int, int, int>(tuple.Item1, tuple.Item2, tuple.Item3));
}
else
{
// Shift
if (!shift_info.ContainsKey(ms.Key))
shift_info.Add(ms.Key, new List<Tuple<int, int>>());
shift_info[ms.Key].Add(new Tuple<int, int>(tuple.Item1, small_shift_info[shift_tokens[tuple.Item1]].Item2));
}
completes.Add(tuple.Item1);
}
else
{
// Just add reduce item
if (!reduce_info.ContainsKey(ms.Key))
reduce_info.Add(ms.Key, new List<Tuple<int, int, int>>());
reduce_info[ms.Key].Add(new Tuple<int, int, int>(tuple.Item1, tuple.Item2, tuple.Item3));
completes.Add(tuple.Item1);
}
}
foreach (var pair in shift_tokens)
{
if (completes.Contains(pair.Key)) continue;
var shift = small_shift_info[pair.Value];
if (!shift_info.ContainsKey(ms.Key))
shift_info.Add(ms.Key, new List<Tuple<int, int>>());
shift_info[ms.Key].Add(new Tuple<int, int>(shift.Item1, shift.Item2));
}
}
// -----------------------------------------------------
if (occurred_conflict)
throw new Exception("Specify the rules to resolve Shift-Reduce Conflict!");
number_of_states = states.Count;
#if true
print_header("STATES INFO");
foreach (var s in states)
print_states(s.Key, s.Value);
#endif
}
#endregion
#region LALR Generator
/// <summary>
/// Generate LALR Table
/// </summary>
public void GenerateLALR()
{
// --------------- Delete EmptyString ---------------
for (int i = 0; i < production_rules.Count; i++)
if (!production_rules[i].isterminal)
for (int j = 0; j < production_rules[i].sub_productions.Count; j++)
if (production_rules[i].sub_productions[j][0].index == EmptyString.index)
production_rules[i].sub_productions[j].Clear();
// --------------------------------------------------
// --------------- Collect FIRST,FOLLOW Set ---------------
var FIRST = new List<HashSet<int>>();
foreach (var rule in production_rules)
FIRST.Add(first_terminals(rule.index));
var FOLLOW = follow_terminals(FIRST);
#if true
print_header("FISRT, FOLLOW SETS");
print_hs(FIRST, "FIRST");
print_hs(FOLLOW, "FOLLOW");
#endif
// --------------------------------------------------------
// (state_index, (production_rule_index, sub_productions_pos, dot_position, (lookahead))
var states = new Dictionary<int, List<Tuple<int, int, int, HashSet<int>>>>();
// (state_specify, state_index)
var state_index = new Dictionary<string, int>();
var goto_table = new List<Tuple<int, List<Tuple<int, int>>>>();
// (state_index, (shift_what, state_index))
shift_info = new Dictionary<int, List<Tuple<int, int>>>();
// (state_index, (reduce_what, production_rule_index, sub_productions_pos))
reduce_info = new Dictionary<int, List<Tuple<int, int, int>>>();
var index_count = 0;
// -------------------- Put first eater -------------------
var first_l = first_with_lookahead(0, 0, 0, new HashSet<int>());
state_index.Add(l2s(first_l), 0);
states.Add(0, first_l);
// --------------------------------------------------------
// Create all LR states
// (states)
var q = new Queue<int>();
q.Enqueue(index_count++);
while (q.Count != 0)
{
var p = q.Dequeue();
// Collect goto
// (state_index, (production_rule_index, sub_productions_pos, dot_position, lookahead))
var gotos = new Dictionary<int, List<Tuple<int, int, int, HashSet<int>>>>();
foreach (var transition in states[p])
if (production_rules[transition.Item1].sub_productions[transition.Item2].Count > transition.Item3)
{
var pi = production_rules[transition.Item1].sub_productions[transition.Item2][transition.Item3].index;
if (!gotos.ContainsKey(pi))