92 lines
3.0 KiB
C#
92 lines
3.0 KiB
C#
using System.Text;
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namespace CompilerDesignIFlr1
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{
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internal class LR1Table
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{
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internal List<Row> Rows = [];
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internal LR1Table(LR1Creator creator)
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{
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for (int i = 0; i < creator.Closures.Count; i++)
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{
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LR1Closure closure = creator.Closures[i];
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Dictionary<string, int> @goto = [];
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Dictionary<string, string> action = [];
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foreach (var (by, nextIndex) in closure.Next)
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{
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if (creator.TokenUnit.ContainsKey(by))
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action.Add(by, "s" + nextIndex);
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else
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@goto.Add(by, nextIndex);
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}
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foreach (var unit in closure.GetReduceUnits())
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{
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foreach (string prospect in unit.Prospect)
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{
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if (action.ContainsKey(prospect))
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throw new Exception("Reduce,Reduce/Reduce,Shift error occurred.");
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action.Add(prospect, "r" + unit.Id);
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}
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}
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Rows.Add(new Row(i, @goto, action));
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}
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PrintRow();
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return;
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}
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private void PrintRow()
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{
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foreach (Row row in Rows)
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{
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Console.WriteLine(row);
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}
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}
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}
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internal class Row
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{
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internal int Id;
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internal Dictionary<string, int> GOTO;
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internal Dictionary<string, string> ACTION;
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internal Row(int id, Dictionary<string, int> @goto, Dictionary<string, string> action)
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{
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Id = id;
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GOTO = @goto;
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ACTION = action;
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}
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public override string ToString()
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{
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StringBuilder sb = new StringBuilder();
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sb.Append(Id + " \n");
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sb.Append("ACTION: \n");
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foreach (var (key, value) in ACTION)
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sb.Append(key).Append(": ").Append(value).Append(", ");
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if(GOTO.Count != 0)
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sb.Append("\nGOTO: \n");
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foreach (var (key, value) in GOTO)
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sb.Append(key).Append(": ").Append(value).Append(", ");
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sb.Append('\n');
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return sb.ToString();
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}
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public (string, int) Next(string name)
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{
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if (name == "StatementList" && Id == 0)
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return ("ACC", 0);
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if (GOTO.TryGetValue(name, out var result))
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return ("GOTO", result);
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if (ACTION.TryGetValue(name, out var value))
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if (value.StartsWith("s"))
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return ("GOTO", int.Parse(value.Substring(1)));
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else if (value.StartsWith("r"))
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return ("Reduce", int.Parse(value.Substring(1)));
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else
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throw new Exception($"Value can't be recognized. {value}");
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throw new InvalidOperationException($"Code error in state {Id}: {name} not found");
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}
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}
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}
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