Lexer.java

package com.hypixel.hytale.server.npc.util.expression.compile;

import it.unimi.dsi.fastutil.objects.ObjectArrayList;
import java.text.ParseException;
import java.util.List;
import java.util.function.Supplier;
import java.util.stream.Stream;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;

public class Lexer<Token extends Supplier<String>> {
   public static final String UNTERMINATED_STRING = "Unterminated string";
   public static final String INVALID_NUMBER_FORMAT = "Invalid number format";
   public static final String INVALID_CHARACTER_IN_EXPRESSION = "Invalid character in expression :";
   private final Token tokenEnd;
   private final Token tokenIdent;
   private final Token tokenString;
   private  Token tokenNumber;
     CharacterSequenceMatcher<Token> characterSequenceMatcher;

     {
      .tokenEnd = tokenEnd;
      .tokenIdent = tokenIdent;
      .tokenString = tokenString;
      .tokenNumber = tokenNumber;
      .characterSequenceMatcher =  <Token>();
      operators.forEach((token) -> .characterSequenceMatcher.addToken(token, (String)token.get()));
   }

    Token   ParseException {
      context.resetToken();
       (!context.eatWhiteSpace()) {
          context.setToken(.tokenEnd);
      }  {
            context.currentChar();
          (!Character.isLetter(ch) && ch != ) {
             (context.isNumber(ch)) {
               context.parseNumber(ch);
                context.setToken(.tokenNumber);
            }   (ch !=  && ch != ) {
               CharacterSequenceMatcher<Token> lastTerminal = ;
               CharacterSequenceMatcher<Token> matcher = .characterSequenceMatcher.matchLetter(ch);

                lastValidPosition;
               (lastValidPosition = context.getPosition(); matcher != ; matcher = matcher.matchLetter(ch)) {
                   (matcher.token != ) {
                     lastValidPosition = context.getPosition();
                     lastTerminal = matcher;
                  }

                  ch = context.addTokenCharacter(ch);
                   (!context.haveChar()) {
                     ;
                  }
               }

                (lastTerminal != ) {
                  context.adjustPosition(lastValidPosition + );
                   context.setToken(lastTerminal.token);
               }  {
                    ( + ch, context.getTokenPosition());
               }
            }  {
               context.parseString(ch);
                context.setToken(.tokenString);
            }
         }  {
            context.parseIdent(ch);
             context.setToken(.tokenIdent);
         }
      }
   }

      <Token> {
      
          ;
        letter;
      
       List<CharacterSequenceMatcher<Token>> children;

        {
         .letter = ;
         .children = ;
      }

        {
         .letter = letter;
         .children = ;
      }

         {
            text.charAt(depth);
          (.children == ) {
            .children =  <CharacterSequenceMatcher<Token>>();
            .append(token, depth, text, maxDepth, ch);
         }  {
               ;

             size;
            (size = .children.size(); index < size && ((CharacterSequenceMatcher).children.get(index)).letter < ch; ++index) {
            }

             (index == size) {
               .append(token, depth, text, maxDepth, ch);
            }  {
               CharacterSequenceMatcher<Token> child = (CharacterSequenceMatcher).children.get(index);
                (child.letter == ch) {
                   (depth == maxDepth) {
                      (child.token != ) {
                          ( + text);
                     }

                     child.token = token;
                  }  {
                     child.addToken(token, depth + , text, maxDepth);
                  }
               }  {
                  CharacterSequenceMatcher<Token> lookup =  <Token>(ch);
                  .children.add(index, lookup);
                  .addTail(token, depth, text, maxDepth, lookup);
               }
            }

         }
      }

         {
         .addToken(token, , text, text.length() - );
      }

         {
         CharacterSequenceMatcher<Token> lookup =  <Token>(ch);
         .children.add(lookup);
         .addTail(token, depth, text, maxDepth, lookup);
      }

         {
          (depth == maxDepth) {
            lookup.token = token;
         }  {
            lookup.addToken(token, depth + , text, maxDepth);
         }

      }

      
       CharacterSequenceMatcher<Token>  {
          (.children != ) {
               ;

            (   .children.size(); index < size; ++index) {
               CharacterSequenceMatcher<Token> characterSequenceMatcher = (CharacterSequenceMatcher).children.get(index);
                  characterSequenceMatcher.letter;
                (letter == ch) {
                   characterSequenceMatcher;
               }

                (letter > ch) {
                   ;
               }
            }
         }

          ;
      }
   }
}