lucene/queryparser/src/java/org/apache/lucene/queryparser/flexible/standard/parser/StandardSyntaxParser.java

/* StandardSyntaxParser.java */
/* Generated By:JavaCC: Do not edit this line. StandardSyntaxParser.java */
package org.apache.lucene.queryparser.flexible.standard.parser;

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.io.StringReader;
import java.io.Reader;
import java.util.Collections;
import java.util.ArrayList;

import org.apache.lucene.queryparser.flexible.messages.Message;
import org.apache.lucene.queryparser.flexible.messages.MessageImpl;
import org.apache.lucene.queryparser.flexible.core.QueryNodeParseException;
import org.apache.lucene.queryparser.flexible.core.messages.QueryParserMessages;
import org.apache.lucene.queryparser.flexible.core.parser.SyntaxParser;
import org.apache.lucene.queryparser.flexible.core.nodes.AndQueryNode;
import org.apache.lucene.queryparser.flexible.core.nodes.BooleanQueryNode;
import org.apache.lucene.queryparser.flexible.core.nodes.BoostQueryNode;
import org.apache.lucene.queryparser.flexible.core.nodes.FieldQueryNode;
import org.apache.lucene.queryparser.flexible.core.nodes.FuzzyQueryNode;
import org.apache.lucene.queryparser.flexible.core.nodes.ModifierQueryNode;
import org.apache.lucene.queryparser.flexible.core.nodes.GroupQueryNode;
import org.apache.lucene.queryparser.flexible.core.nodes.OrQueryNode;
import org.apache.lucene.queryparser.flexible.core.nodes.SlopQueryNode;
import org.apache.lucene.queryparser.flexible.core.nodes.QueryNode;
import org.apache.lucene.queryparser.flexible.core.nodes.QuotedFieldQueryNode;
import org.apache.lucene.queryparser.flexible.standard.nodes.TermRangeQueryNode;
import org.apache.lucene.queryparser.flexible.standard.nodes.RegexpQueryNode;
import org.apache.lucene.queryparser.charstream.CharStream;
import org.apache.lucene.queryparser.charstream.FastCharStream;

import static org.apache.lucene.queryparser.flexible.standard.parser.EscapeQuerySyntaxImpl.discardEscapeChar;

/**
 * Parser for the standard Lucene syntax
 */
public class StandardSyntaxParser implements SyntaxParser, StandardSyntaxParserConstants {
  public StandardSyntaxParser() {
    this(new FastCharStream(Reader.nullReader()));
  }

  /**
   * Parses a query string, returning a {@link org.apache.lucene.queryparser.flexible.core.nodes.QueryNode}.
   * @param query  the query string to be parsed.
   * @throws ParseException if the parsing fails
   */
  public QueryNode parse(CharSequence query, CharSequence field) throws QueryNodeParseException {
    ReInit(new FastCharStream(new StringReader(query.toString())));
    try {
      return TopLevelQuery(field);
    } catch (ParseException tme) {
      tme.setQuery(query);
      throw tme;
    } catch (Error tme) {
      Message message = new MessageImpl(QueryParserMessages.INVALID_SYNTAX_CANNOT_PARSE, query, tme.getMessage());
      QueryNodeParseException e = new QueryNodeParseException(tme);
      e.setQuery(query);
      e.setNonLocalizedMessage(message);
      throw e;
    }
  }

  final public QueryNode TopLevelQuery(CharSequence field) throws ParseException {QueryNode q;
    q = Query(field);
    jj_consume_token(0);
{if ("" != null) return q;}
    throw new Error("Missing return statement in function");
}

  final private QueryNode Query(CharSequence field) throws ParseException {ArrayList<QueryNode> clauses = new ArrayList<>();
  QueryNode node;
    label_1:
    while (true) {
      node = DisjQuery(field);
clauses.add(node);
      switch ((jj_ntk==-1)?jj_ntk_f():jj_ntk) {
      case NOT:
      case PLUS:
      case MINUS:
      case LPAREN:
      case QUOTED:
      case NUMBER:
      case TERM:
      case REGEXPTERM:
      case RANGEIN_START:
      case RANGEEX_START:{
        ;
        break;
        }
      default:
        jj_la1[0] = jj_gen;
        break label_1;
      }
    }
// Handle the case of a "pure" negation query which
    // needs to be wrapped as a boolean query, otherwise
    // the returned result drops the negation.
    if (clauses.size() == 1) {
      QueryNode first = clauses.get(0);
      if (first instanceof ModifierQueryNode
          && ((ModifierQueryNode) first).getModifier() == ModifierQueryNode.Modifier.MOD_NOT) {
        clauses.set(0, new BooleanQueryNode(Collections.singletonList(first)));
      }
    }

    {if ("" != null) return clauses.size() == 1 ? clauses.get(0) : new BooleanQueryNode(clauses);}
    throw new Error("Missing return statement in function");
}

  final private QueryNode DisjQuery(CharSequence field) throws ParseException {ArrayList<QueryNode> clauses = new ArrayList<>();
  QueryNode node;
    node = ConjQuery(field);
clauses.add(node);
    label_2:
    while (true) {
      switch ((jj_ntk==-1)?jj_ntk_f():jj_ntk) {
      case OR:{
        ;
        break;
        }
      default:
        jj_la1[1] = jj_gen;
        break label_2;
      }
      jj_consume_token(OR);
      node = ConjQuery(field);
clauses.add(node);
    }
{if ("" != null) return clauses.size() == 1 ? clauses.get(0) : new OrQueryNode(clauses);}
    throw new Error("Missing return statement in function");
}

  final private QueryNode ConjQuery(CharSequence field) throws ParseException {ArrayList<QueryNode> clauses = new ArrayList<>();
  QueryNode node;
    node = ModClause(field);
clauses.add(node);
    label_3:
    while (true) {
      switch ((jj_ntk==-1)?jj_ntk_f():jj_ntk) {
      case AND:{
        ;
        break;
        }
      default:
        jj_la1[2] = jj_gen;
        break label_3;
      }
      jj_consume_token(AND);
      node = ModClause(field);
clauses.add(node);
    }
{if ("" != null) return clauses.size() == 1 ? clauses.get(0) : new AndQueryNode(clauses);}
    throw new Error("Missing return statement in function");
}

  final private QueryNode ModClause(CharSequence field) throws ParseException {QueryNode q;
  ModifierQueryNode.Modifier modifier = ModifierQueryNode.Modifier.MOD_NONE;
    switch ((jj_ntk==-1)?jj_ntk_f():jj_ntk) {
    case NOT:
    case PLUS:
    case MINUS:{
      switch ((jj_ntk==-1)?jj_ntk_f():jj_ntk) {
      case PLUS:{
        jj_consume_token(PLUS);
modifier = ModifierQueryNode.Modifier.MOD_REQ;
        break;
        }
      case NOT:
      case MINUS:{
        switch ((jj_ntk==-1)?jj_ntk_f():jj_ntk) {
        case MINUS:{
          jj_consume_token(MINUS);
          break;
          }
        case NOT:{
          jj_consume_token(NOT);
          break;
          }
        default:
          jj_la1[3] = jj_gen;
          jj_consume_token(-1);
          throw new ParseException();
        }
modifier = ModifierQueryNode.Modifier.MOD_NOT;
        break;
        }
      default:
        jj_la1[4] = jj_gen;
        jj_consume_token(-1);
        throw new ParseException();
      }
      break;
      }
    default:
      jj_la1[5] = jj_gen;
      ;
    }
    q = Clause(field);
if (modifier != ModifierQueryNode.Modifier.MOD_NONE) {
      q = new ModifierQueryNode(q, modifier);
    }
    {if ("" != null) return q;}
    throw new Error("Missing return statement in function");
}

  final private QueryNode Clause(CharSequence field) throws ParseException {QueryNode q;
    if (jj_2_2(2)) {
      q = FieldRangeExpr(field);
    } else {
      switch ((jj_ntk==-1)?jj_ntk_f():jj_ntk) {
      case LPAREN:
      case QUOTED:
      case NUMBER:
      case TERM:
      case REGEXPTERM:
      case RANGEIN_START:
      case RANGEEX_START:{
        if (jj_2_1(2)) {
          field = FieldName();
          switch ((jj_ntk==-1)?jj_ntk_f():jj_ntk) {
          case OP_COLON:{
            jj_consume_token(OP_COLON);
            break;
            }
          case OP_EQUAL:{
            jj_consume_token(OP_EQUAL);
            break;
            }
          default:
            jj_la1[6] = jj_gen;
            jj_consume_token(-1);
            throw new ParseException();
          }
        } else {
          ;
        }
        switch ((jj_ntk==-1)?jj_ntk_f():jj_ntk) {
        case QUOTED:
        case NUMBER:
        case TERM:
        case REGEXPTERM:
        case RANGEIN_START:
        case RANGEEX_START:{
          q = Term(field);
          break;
          }
        case LPAREN:{
          q = GroupingExpr(field);
          break;
          }
        default:
          jj_la1[7] = jj_gen;
          jj_consume_token(-1);
          throw new ParseException();
        }
        break;
        }
      default:
        jj_la1[8] = jj_gen;
        jj_consume_token(-1);
        throw new ParseException();
      }
    }
{if ("" != null) return q;}
    throw new Error("Missing return statement in function");
}

  final private CharSequence FieldName() throws ParseException {Token name;
    name = jj_consume_token(TERM);
{if ("" != null) return discardEscapeChar(name.image);}
    throw new Error("Missing return statement in function");
}

  final private GroupQueryNode GroupingExpr(CharSequence field) throws ParseException {QueryNode q;
  Token boost;
    jj_consume_token(LPAREN);
    q = Query(field);
    jj_consume_token(RPAREN);
    switch ((jj_ntk==-1)?jj_ntk_f():jj_ntk) {
    case CARAT:{
      q = Boost(q);
      break;
      }
    default:
      jj_la1[9] = jj_gen;
      ;
    }
{if ("" != null) return new GroupQueryNode(q);}
    throw new Error("Missing return statement in function");
}

  final private QueryNode Boost(QueryNode node) throws ParseException {Token boost;
    jj_consume_token(CARAT);
    boost = jj_consume_token(NUMBER);
{if ("" != null) return node == null ? node : new BoostQueryNode(node, Float.parseFloat(boost.image));}
    throw new Error("Missing return statement in function");
}

  final private QueryNode FuzzyOp(CharSequence field, Token term, QueryNode node) throws ParseException {Token similarity = null;
    jj_consume_token(TILDE);
    if (jj_2_3(2)) {
      similarity = jj_consume_token(NUMBER);
    } else {
      ;
    }
float fms = org.apache.lucene.search.FuzzyQuery.defaultMaxEdits;
    if (similarity != null) {
      fms = Float.parseFloat(similarity.image);
      if (fms < 0.0f) {
        {if (true) throw new ParseException(new MessageImpl(QueryParserMessages.INVALID_SYNTAX_FUZZY_LIMITS));}
      } else if (fms >= 1.0f && fms != (int) fms) {
        {if (true) throw new ParseException(new MessageImpl(QueryParserMessages.INVALID_SYNTAX_FUZZY_EDITS));}
      }
    }
    {if ("" != null) return new FuzzyQueryNode(field, discardEscapeChar(term.image), fms, term.beginColumn, term.endColumn);}
    throw new Error("Missing return statement in function");
}

  final private TermRangeQueryNode FieldRangeExpr(CharSequence field) throws ParseException {Token operator, term;
  FieldQueryNode qLower, qUpper;
  boolean lowerInclusive, upperInclusive;
    field = FieldName();
    switch ((jj_ntk==-1)?jj_ntk_f():jj_ntk) {
    case OP_LESSTHAN:{
      jj_consume_token(OP_LESSTHAN);
      break;
      }
    case OP_LESSTHANEQ:{
      jj_consume_token(OP_LESSTHANEQ);
      break;
      }
    case OP_MORETHAN:{
      jj_consume_token(OP_MORETHAN);
      break;
      }
    case OP_MORETHANEQ:{
      jj_consume_token(OP_MORETHANEQ);
      break;
      }
    default:
      jj_la1[10] = jj_gen;
      jj_consume_token(-1);
      throw new ParseException();
    }
operator = token;
    switch ((jj_ntk==-1)?jj_ntk_f():jj_ntk) {
    case TERM:{
      jj_consume_token(TERM);
      break;
      }
    case QUOTED:{
      jj_consume_token(QUOTED);
      break;
      }
    case NUMBER:{
      jj_consume_token(NUMBER);
      break;
      }
    default:
      jj_la1[11] = jj_gen;
      jj_consume_token(-1);
      throw new ParseException();
    }
term = token;
if (term.kind == QUOTED) {
      term.image = term.image.substring(1, term.image.length() - 1);
    }
    switch (operator.kind) {
      case OP_LESSTHAN:
        lowerInclusive = true;
        upperInclusive = false;
        qLower = new FieldQueryNode(field, "*", term.beginColumn, term.endColumn);
        qUpper = new FieldQueryNode(field, discardEscapeChar(term.image), term.beginColumn, term.endColumn);
        break;
      case OP_LESSTHANEQ:
        lowerInclusive = true;
        upperInclusive = true;
        qLower = new FieldQueryNode(field, "*", term.beginColumn, term.endColumn);
        qUpper = new FieldQueryNode(field, discardEscapeChar(term.image), term.beginColumn, term.endColumn);
        break;
      case OP_MORETHAN:
        lowerInclusive = false;
        upperInclusive = true;
        qLower = new FieldQueryNode(field, discardEscapeChar(term.image), term.beginColumn, term.endColumn);
        qUpper = new FieldQueryNode(field, "*", term.beginColumn, term.endColumn);
        break;
      case OP_MORETHANEQ:
        lowerInclusive = true;
        upperInclusive = true;
        qLower = new FieldQueryNode(field, discardEscapeChar(term.image), term.beginColumn, term.endColumn);
        qUpper = new FieldQueryNode(field, "*", term.beginColumn, term.endColumn);
        break;
      default:
        {if (true) throw new Error("Unhandled case, operator=" + operator);}
    }
    {if ("" != null) return new TermRangeQueryNode(qLower, qUpper, lowerInclusive, upperInclusive);}
    throw new Error("Missing return statement in function");
}

  final private QueryNode Term(CharSequence field) throws ParseException {QueryNode q;
  Token term, fuzzySlop=null;
    switch ((jj_ntk==-1)?jj_ntk_f():jj_ntk) {
    case REGEXPTERM:{
      term = jj_consume_token(REGEXPTERM);
q = new RegexpQueryNode(field, term.image.substring(1, term.image.length() - 1));
      break;
      }
    case NUMBER:
    case TERM:{
      switch ((jj_ntk==-1)?jj_ntk_f():jj_ntk) {
      case TERM:{
        term = jj_consume_token(TERM);
        break;
        }
      case NUMBER:{
        term = jj_consume_token(NUMBER);
        break;
        }
      default:
        jj_la1[12] = jj_gen;
        jj_consume_token(-1);
        throw new ParseException();
      }
q = new FieldQueryNode(field, discardEscapeChar(term.image), term.beginColumn, term.endColumn);
      switch ((jj_ntk==-1)?jj_ntk_f():jj_ntk) {
      case TILDE:{
        q = FuzzyOp(field, term, q);
        break;
        }
      default:
        jj_la1[13] = jj_gen;
        ;
      }
      break;
      }
    case RANGEIN_START:
    case RANGEEX_START:{
      q = TermRangeExpr(field);
      break;
      }
    case QUOTED:{
      q = QuotedTerm(field);
      break;
      }
    default:
      jj_la1[14] = jj_gen;
      jj_consume_token(-1);
      throw new ParseException();
    }
    switch ((jj_ntk==-1)?jj_ntk_f():jj_ntk) {
    case CARAT:{
      q = Boost(q);
      break;
      }
    default:
      jj_la1[15] = jj_gen;
      ;
    }
{if ("" != null) return q;}
    throw new Error("Missing return statement in function");
}

  final private QueryNode QuotedTerm(CharSequence field) throws ParseException {QueryNode q;
  Token term, slop;
    term = jj_consume_token(QUOTED);
String image = term.image.substring(1, term.image.length() - 1);
    q = new QuotedFieldQueryNode(field, discardEscapeChar(image), term.beginColumn + 1, term.endColumn - 1);
    switch ((jj_ntk==-1)?jj_ntk_f():jj_ntk) {
    case TILDE:{
      jj_consume_token(TILDE);
      slop = jj_consume_token(NUMBER);
q = new SlopQueryNode(q, (int) Float.parseFloat(slop.image));
      break;
      }
    default:
      jj_la1[16] = jj_gen;
      ;
    }
{if ("" != null) return q;}
    throw new Error("Missing return statement in function");
}

  final private TermRangeQueryNode TermRangeExpr(CharSequence field) throws ParseException {Token left, right;
  boolean leftInclusive = false;
  boolean rightInclusive = false;
    switch ((jj_ntk==-1)?jj_ntk_f():jj_ntk) {
    case RANGEIN_START:{
      jj_consume_token(RANGEIN_START);
leftInclusive = true;
      break;
      }
    case RANGEEX_START:{
      jj_consume_token(RANGEEX_START);
      break;
      }
    default:
      jj_la1[17] = jj_gen;
      jj_consume_token(-1);
      throw new ParseException();
    }
    switch ((jj_ntk==-1)?jj_ntk_f():jj_ntk) {
    case RANGE_GOOP:{
      jj_consume_token(RANGE_GOOP);
      break;
      }
    case RANGE_QUOTED:{
      jj_consume_token(RANGE_QUOTED);
      break;
      }
    case RANGE_TO:{
      jj_consume_token(RANGE_TO);
      break;
      }
    default:
      jj_la1[18] = jj_gen;
      jj_consume_token(-1);
      throw new ParseException();
    }
left = token;
    jj_consume_token(RANGE_TO);
    switch ((jj_ntk==-1)?jj_ntk_f():jj_ntk) {
    case RANGE_GOOP:{
      jj_consume_token(RANGE_GOOP);
      break;
      }
    case RANGE_QUOTED:{
      jj_consume_token(RANGE_QUOTED);
      break;
      }
    case RANGE_TO:{
      jj_consume_token(RANGE_TO);
      break;
      }
    default:
      jj_la1[19] = jj_gen;
      jj_consume_token(-1);
      throw new ParseException();
    }
right = token;
    switch ((jj_ntk==-1)?jj_ntk_f():jj_ntk) {
    case RANGEIN_END:{
      jj_consume_token(RANGEIN_END);
rightInclusive = true;
      break;
      }
    case RANGEEX_END:{
      jj_consume_token(RANGEEX_END);
      break;
      }
    default:
      jj_la1[20] = jj_gen;
      jj_consume_token(-1);
      throw new ParseException();
    }
if (left.kind == RANGE_QUOTED) {
      left.image = left.image.substring(1, left.image.length() - 1);
    }
    if (right.kind == RANGE_QUOTED) {
      right.image = right.image.substring(1, right.image.length() - 1);
    }

    FieldQueryNode qLower = new FieldQueryNode(field,
      discardEscapeChar(left.image), left.beginColumn, left.endColumn);
    FieldQueryNode qUpper = new FieldQueryNode(field,
      discardEscapeChar(right.image), right.beginColumn, right.endColumn);

    {if ("" != null) return new TermRangeQueryNode(qLower, qUpper, leftInclusive, rightInclusive);}
    throw new Error("Missing return statement in function");
}

  private boolean jj_2_1(int xla)
 {
    jj_la = xla; jj_lastpos = jj_scanpos = token;
    try { return (!jj_3_1()); }
    catch(LookaheadSuccess ls) { return true; }
    finally { jj_save(0, xla); }
  }

  private boolean jj_2_2(int xla)
 {
    jj_la = xla; jj_lastpos = jj_scanpos = token;
    try { return (!jj_3_2()); }
    catch(LookaheadSuccess ls) { return true; }
    finally { jj_save(1, xla); }
  }

  private boolean jj_2_3(int xla)
 {
    jj_la = xla; jj_lastpos = jj_scanpos = token;
    try { return (!jj_3_3()); }
    catch(LookaheadSuccess ls) { return true; }
    finally { jj_save(2, xla); }
  }

  private boolean jj_3R_4()
 {
    if (jj_scan_token(TERM)) return true;
    return false;
  }

  private boolean jj_3_2()
 {
    if (jj_3R_5()) return true;
    return false;
  }

  private boolean jj_3R_5()
 {
    if (jj_3R_4()) return true;
    Token xsp;
    xsp = jj_scanpos;
    if (jj_scan_token(17)) {
    jj_scanpos = xsp;
    if (jj_scan_token(18)) {
    jj_scanpos = xsp;
    if (jj_scan_token(19)) {
    jj_scanpos = xsp;
    if (jj_scan_token(20)) return true;
    }
    }
    }
    return false;
  }

  private boolean jj_3_3()
 {
    if (jj_scan_token(NUMBER)) return true;
    return false;
  }

  private boolean jj_3_1()
 {
    if (jj_3R_4()) return true;
    Token xsp;
    xsp = jj_scanpos;
    if (jj_scan_token(15)) {
    jj_scanpos = xsp;
    if (jj_scan_token(16)) return true;
    }
    return false;
  }

  /** Generated Token Manager. */
  public StandardSyntaxParserTokenManager token_source;
  /** Current token. */
  public Token token;
  /** Next token. */
  public Token jj_nt;
  private int jj_ntk;
  private Token jj_scanpos, jj_lastpos;
  private int jj_la;
  private int jj_gen;
  final private int[] jj_la1 = new int[21];
  static private int[] jj_la1_0;
  static private int[] jj_la1_1;
  static {
       jj_la1_init_0();
       jj_la1_init_1();
    }
    private static void jj_la1_init_0() {
       jj_la1_0 = new int[] {0x1f803c00,0x200,0x100,0x1400,0x1c00,0x1c00,0x18000,0x1f802000,0x1f802000,0x200000,0x1e0000,0x3800000,0x3000000,0x400000,0x1f800000,0x200000,0x400000,0x18000000,0x20000000,0x20000000,0xc0000000,};
    }
    private static void jj_la1_init_1() {
       jj_la1_1 = new int[] {0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x3,0x3,0x0,};
    }
  final private JJCalls[] jj_2_rtns = new JJCalls[3];
  private boolean jj_rescan = false;
  private int jj_gc = 0;

  /** Constructor with user supplied CharStream. */
  public StandardSyntaxParser(CharStream stream) {
     token_source = new StandardSyntaxParserTokenManager(stream);
     token = new Token();
     jj_ntk = -1;
     jj_gen = 0;
     for (int i = 0; i < 21; i++) jj_la1[i] = -1;
     for (int i = 0; i < jj_2_rtns.length; i++) jj_2_rtns[i] = new JJCalls();
  }

  /** Reinitialise. */
  public void ReInit(CharStream stream) {
     token_source.ReInit(stream);
     token = new Token();
     jj_ntk = -1;
     jj_gen = 0;
     for (int i = 0; i < 21; i++) jj_la1[i] = -1;
     for (int i = 0; i < jj_2_rtns.length; i++) jj_2_rtns[i] = new JJCalls();
  }

  /** Constructor with generated Token Manager. */
  public StandardSyntaxParser(StandardSyntaxParserTokenManager tm) {
     token_source = tm;
     token = new Token();
     jj_ntk = -1;
     jj_gen = 0;
     for (int i = 0; i < 21; i++) jj_la1[i] = -1;
     for (int i = 0; i < jj_2_rtns.length; i++) jj_2_rtns[i] = new JJCalls();
  }

  /** Reinitialise. */
  public void ReInit(StandardSyntaxParserTokenManager tm) {
     token_source = tm;
     token = new Token();
     jj_ntk = -1;
     jj_gen = 0;
     for (int i = 0; i < 21; i++) jj_la1[i] = -1;
     for (int i = 0; i < jj_2_rtns.length; i++) jj_2_rtns[i] = new JJCalls();
  }

  private Token jj_consume_token(int kind) throws ParseException {
     Token oldToken;
     if ((oldToken = token).next != null) token = token.next;
     else token = token.next = token_source.getNextToken();
     jj_ntk = -1;
     if (token.kind == kind) {
       jj_gen++;
       if (++jj_gc > 100) {
         jj_gc = 0;
         for (int i = 0; i < jj_2_rtns.length; i++) {
           JJCalls c = jj_2_rtns[i];
           while (c != null) {
             if (c.gen < jj_gen) c.first = null;
             c = c.next;
           }
         }
       }
       return token;
     }
     token = oldToken;
     jj_kind = kind;
     throw generateParseException();
  }

  @SuppressWarnings("serial")
  static private final class LookaheadSuccess extends java.lang.Error { }
  final private LookaheadSuccess jj_ls = new LookaheadSuccess();
  private boolean jj_scan_token(int kind) {
     if (jj_scanpos == jj_lastpos) {
       jj_la--;
       if (jj_scanpos.next == null) {
         jj_lastpos = jj_scanpos = jj_scanpos.next = token_source.getNextToken();
       } else {
         jj_lastpos = jj_scanpos = jj_scanpos.next;
       }
     } else {
       jj_scanpos = jj_scanpos.next;
     }
     if (jj_rescan) {
       int i = 0; Token tok = token;
       while (tok != null && tok != jj_scanpos) { i++; tok = tok.next; }
       if (tok != null) jj_add_error_token(kind, i);
     }
     if (jj_scanpos.kind != kind) return true;
     if (jj_la == 0 && jj_scanpos == jj_lastpos) throw jj_ls;
     return false;
  }


/** Get the next Token. */
  final public Token getNextToken() {
     if (token.next != null) token = token.next;
     else token = token.next = token_source.getNextToken();
     jj_ntk = -1;
     jj_gen++;
     return token;
  }

/** Get the specific Token. */
  final public Token getToken(int index) {
     Token t = token;
     for (int i = 0; i < index; i++) {
       if (t.next != null) t = t.next;
       else t = t.next = token_source.getNextToken();
     }
     return t;
  }

  private int jj_ntk_f() {
     if ((jj_nt=token.next) == null)
       return (jj_ntk = (token.next=token_source.getNextToken()).kind);
     else
       return (jj_ntk = jj_nt.kind);
  }

  private java.util.List<int[]> jj_expentries = new java.util.ArrayList<>();
  private int[] jj_expentry;
  private int jj_kind = -1;
  private int[] jj_lasttokens = new int[100];
  private int jj_endpos;

  private void jj_add_error_token(int kind, int pos) {
     if (pos >= 100) {
        return;
     }

     if (pos == jj_endpos + 1) {
       jj_lasttokens[jj_endpos++] = kind;
     } else if (jj_endpos != 0) {
       jj_expentry = new int[jj_endpos];

       for (int i = 0; i < jj_endpos; i++) {
         jj_expentry[i] = jj_lasttokens[i];
       }

       for (int[] oldentry : jj_expentries) {
         if (oldentry.length == jj_expentry.length) {
           boolean isMatched = true;

           for (int i = 0; i < jj_expentry.length; i++) {
             if (oldentry[i] != jj_expentry[i]) {
               isMatched = false;
               break;
             }

           }
           if (isMatched) {
             jj_expentries.add(jj_expentry);
             break;
           }
         }
       }

       if (pos != 0) {
         jj_lasttokens[(jj_endpos = pos) - 1] = kind;
       }
     }
  }

  /** Generate ParseException. */
  public ParseException generateParseException() {
     jj_expentries.clear();
     boolean[] la1tokens = new boolean[34];
     if (jj_kind >= 0) {
       la1tokens[jj_kind] = true;
       jj_kind = -1;
     }
     for (int i = 0; i < 21; i++) {
       if (jj_la1[i] == jj_gen) {
         for (int j = 0; j < 32; j++) {
           if ((jj_la1_0[i] & (1<<j)) != 0) {
             la1tokens[j] = true;
           }
           if ((jj_la1_1[i] & (1<<j)) != 0) {
             la1tokens[32+j] = true;
           }
         }
       }
     }
     for (int i = 0; i < 34; i++) {
       if (la1tokens[i]) {
         jj_expentry = new int[1];
         jj_expentry[0] = i;
         jj_expentries.add(jj_expentry);
       }
     }
     jj_endpos = 0;
     jj_rescan_token();
     jj_add_error_token(0, 0);
     int[][] exptokseq = new int[jj_expentries.size()][];
     for (int i = 0; i < jj_expentries.size(); i++) {
       exptokseq[i] = jj_expentries.get(i);
     }
     return new ParseException(token, exptokseq, tokenImage);
  }

  private int trace_indent = 0;
  private boolean trace_enabled;

/** Trace enabled. */
  final public boolean trace_enabled() {
     return trace_enabled;
  }

  /** Enable tracing. */
  final public void enable_tracing() {
  }

  /** Disable tracing. */
  final public void disable_tracing() {
  }

  private void jj_rescan_token() {
     jj_rescan = true;
     for (int i = 0; i < 3; i++) {
       try {
         JJCalls p = jj_2_rtns[i];

         do {
           if (p.gen > jj_gen) {
             jj_la = p.arg; jj_lastpos = jj_scanpos = p.first;
             switch (i) {
               case 0: jj_3_1(); break;
               case 1: jj_3_2(); break;
               case 2: jj_3_3(); break;
             }
           }
           p = p.next;
         } while (p != null);

         } catch(LookaheadSuccess ls) { }
     }
     jj_rescan = false;
  }

  private void jj_save(int index, int xla) {
     JJCalls p = jj_2_rtns[index];
     while (p.gen > jj_gen) {
       if (p.next == null) { p = p.next = new JJCalls(); break; }
       p = p.next;
     }

     p.gen = jj_gen + xla - jj_la; 
     p.first = token;
     p.arg = xla;
  }

  static final class JJCalls {
     int gen;
     Token first;
     int arg;
     JJCalls next;
  }

}