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BibtexParser.java

/*
 Copyright (C) 2003-06 David Weitzman, Nizar N. Batada, Morten O. Alver, Christopher Oezbek

 All programs in this directory and
 subdirectories are published under the GNU General Public License as
 described below.

 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation; either version 2 of the License, or (at
 your option) any later version.

 This program is distributed in the hope that it will be useful, but
 WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program; if not, write to the Free Software
 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 USA

 Further information about the GNU GPL is available at:
 http://www.gnu.org/copyleft/gpl.ja.html

 */

package net.sf.jabref.imports;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.PushbackReader;
import java.io.Reader;
import java.io.StringReader;
import java.util.Collection;
import java.util.HashMap;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import net.sf.jabref.BibtexDatabase;
import net.sf.jabref.BibtexEntry;
import net.sf.jabref.BibtexEntryType;
import net.sf.jabref.BibtexFields;
import net.sf.jabref.BibtexString;
import net.sf.jabref.CustomEntryType;
import net.sf.jabref.GUIGlobals;
import net.sf.jabref.Globals;
import net.sf.jabref.JabRefPreferences;
import net.sf.jabref.KeyCollisionException;
import net.sf.jabref.UnknownEntryType;
import net.sf.jabref.Util;

/**
 * Class for importing BibTeX-files.
 * 
 * Use:
 * 
 * BibtexParser parser = new BibtexParser(reader);
 * 
 * ParserResult result = parser.parse();
 * 
 * or
 * 
 * ParserResult result = BibtexParser.parse(reader);
 * 
 * Can be used stand-alone.
 * 
 * @author David Weitzman
 * @author Nizar N. Batada
 * @author Morten O. Alver
 * @author Christopher Oezbek 
 */
00073 public class BibtexParser {
      
      private PushbackReader _in;

      private BibtexDatabase _db;

      private HashMap<String, String> _meta;
      
      private HashMap<String, BibtexEntryType> entryTypes;

      private boolean _eof = false;

      private int line = 1;

      private FieldContentParser fieldContentParser = new FieldContentParser();

      private ParserResult _pr;
      
      private static final Integer LOOKAHEAD = 64;

      public BibtexParser(Reader in) {

            if (in == null) {
                  throw new NullPointerException();
            }
            if (Globals.prefs == null) {
                  Globals.prefs = JabRefPreferences.getInstance();
            }
            _in = new PushbackReader(in, LOOKAHEAD);
      }

      /**
       * Shortcut usage to create a Parser and read the input.
       * 
       * @param in -
       *            Reader to read from
       * @throws IOException
       */
00111       public static ParserResult parse(Reader in) throws IOException {
            BibtexParser parser = new BibtexParser(in);
            return parser.parse();
      }
      
      
      /**
       * Parses BibtexEntries from the given string and returns the collection of all entries found.
       * 
       * @param bibtexString
       * 
       * @return Returns null if an error occurred, returns an empty collection if no entries where found. 
       */
00124       public static Collection<BibtexEntry> fromString(String bibtexString){
            StringReader reader = new StringReader(bibtexString);
            BibtexParser parser = new BibtexParser(reader); 
            try {
                  return parser.parse().getDatabase().getEntries();
            } catch (Exception e){
                  return null;
            }
      }
      
      /**
       * Parses BibtexEntries from the given string and returns one entry found (or null if none found)
       * 
       * It is undetermined which entry is returned, so use this in case you know there is only one entry in the string.
       * 
       * @param bibtexString
       * 
       * @return The bibtexentry or null if non was found or an error occurred.
       */
00143       public static BibtexEntry singleFromString(String bibtexString) {
            Collection<BibtexEntry> c = fromString(bibtexString);
            if (c == null){
                  return null;
            }
            return c.iterator().next();
      }     
      
      /**
       * Check whether the source is in the correct format for this importer.
       */
00154       public static boolean isRecognizedFormat(Reader inOrig) throws IOException {
            // Our strategy is to look for the "@<type>    {" line.
            BufferedReader in = new BufferedReader(inOrig);

            Pattern pat1 = Pattern.compile("@[a-zA-Z]*\\s*\\{");

            String str;

            while ((str = in.readLine()) != null) {

                  if (pat1.matcher(str).find())
                        return true;
                  else if (str.startsWith(GUIGlobals.SIGNATURE))
                        return true;
            }

            return false;
      }

      private void skipWhitespace() throws IOException {
            int c;

            while (true) {
                  c = read();
                  if ((c == -1) || (c == 65535)) {
                        _eof = true;
                        return;
                  }

                  if (Character.isWhitespace((char) c)) {
                        continue;
                  } else
                        // found non-whitespace char
                        // Util.pr("SkipWhitespace, stops: "+c);
                        unread(c);
                  /*
                   * try { Thread.currentThread().sleep(500); } catch
                   * (InterruptedException ex) {}
                   */
                  break;
            }
      }

      private String skipAndRecordWhitespace(int j) throws IOException {
            int c;
            StringBuffer sb = new StringBuffer();
            if (j != ' ')
                  sb.append((char) j);
            while (true) {
                  c = read();
                  if ((c == -1) || (c == 65535)) {
                        _eof = true;
                        return sb.toString();
                  }

                  if (Character.isWhitespace((char) c)) {
                        if (c != ' ')
                              sb.append((char) c);
                        continue;
                  } else
                        // found non-whitespace char
                        // Util.pr("SkipWhitespace, stops: "+c);
                        unread(c);
                  /*
                   * try { Thread.currentThread().sleep(500); } catch
                   * (InterruptedException ex) {}
                   */
                  break;
            }
            return sb.toString();
      }

      /**
       * Will parse the BibTex-Data found when reading from reader.
       * 
       * The reader will be consumed.
       * 
       * Multiple calls to parse() return the same results
       * 
       * @return ParserResult
       * @throws IOException
       */
00236       public ParserResult parse() throws IOException {

            // If we already parsed this, just return it.
            if (_pr != null)
                  return _pr;

        _db = new BibtexDatabase(); // Bibtex related contents.
            _meta = new HashMap<String, String>(); // Metadata in comments for Bibkeeper.
            entryTypes = new HashMap<String, BibtexEntryType>(); // To store custem entry types parsed.
            _pr = new ParserResult(_db, _meta, entryTypes);

        // First see if we can find the version number of the JabRef version that
        // wrote the file:
        String versionNum = readJabRefVersionNumber();
        if (versionNum != null) {
            _pr.setJabrefVersion(versionNum);
            setMajorMinorVersions();
        }
        else {
            // No version number found. However, we have only
        }

        skipWhitespace();

            try {
                  while (!_eof) {
                        boolean found = consumeUncritically('@');
                        if (!found)
                              break;
                        skipWhitespace();
                        String entryType = parseTextToken();
                        BibtexEntryType tp = BibtexEntryType.getType(entryType);
                        boolean isEntry = (tp != null);
                        // Util.pr(tp.getName());
                        if (!isEntry) {
                              // The entry type name was not recognized. This can mean
                              // that it is a string, preamble, or comment. If so,
                              // parse and set accordingly. If not, assume it is an entry
                              // with an unknown type.
                              if (entryType.toLowerCase().equals("preamble")) {
                                    _db.setPreamble(parsePreamble());
                              } else if (entryType.toLowerCase().equals("string")) {
                                    BibtexString bs = parseString();
                                    try {
                                          _db.addString(bs);
                                    } catch (KeyCollisionException ex) {
                                          _pr.addWarning(Globals.lang("Duplicate string name") + ": "
                                                + bs.getName());
                                          // ex.printStackTrace();
                                    }
                              } else if (entryType.toLowerCase().equals("comment")) {
                                    StringBuffer commentBuf = parseBracketedTextExactly();
                                    /**
                                     * 
                                     * Metadata are used to store Bibkeeper-specific
                                     * information in .bib files.
                                     * 
                                     * Metadata are stored in bibtex files in the format
                                     * 
                                     * @comment{jabref-meta: type:data0;data1;data2;...}
                                     * 
                                     * Each comment that starts with the META_FLAG is stored
                                     * in the meta HashMap, with type as key. Unluckily, the
                                     * old META_FLAG bibkeeper-meta: was used in JabRef 1.0
                                     * and 1.1, so we need to support it as well. At least
                                     * for a while. We'll always save with the new one.
                                     */
                                    String comment = commentBuf.toString().replaceAll("[\\x0d\\x0a]", "");
                                    if (comment.substring(0,
                                          Math.min(comment.length(), GUIGlobals.META_FLAG.length())).equals(
                                          GUIGlobals.META_FLAG)
                                          || comment.substring(0,
                                                Math.min(comment.length(), GUIGlobals.META_FLAG_OLD.length()))
                                                .equals(GUIGlobals.META_FLAG_OLD)) {

                                          String rest;
                                          if (comment.substring(0, GUIGlobals.META_FLAG.length()).equals(
                                                GUIGlobals.META_FLAG))
                                                rest = comment.substring(GUIGlobals.META_FLAG.length());
                                          else
                                                rest = comment.substring(GUIGlobals.META_FLAG_OLD.length());

                                          int pos = rest.indexOf(':');

                                          if (pos > 0)
                                                _meta.put(rest.substring(0, pos), rest.substring(pos + 1));
                                          // We remove all line breaks in the metadata - these
                                          // will have been inserted
                                          // to prevent too long lines when the file was
                                          // saved, and are not part of the data.
                                    }

                                    /**
                                     * A custom entry type can also be stored in a
                                     * 
                                     * @comment:
                                     */
                                    if (comment.substring(0,
                                          Math.min(comment.length(), GUIGlobals.ENTRYTYPE_FLAG.length())).equals(
                                          GUIGlobals.ENTRYTYPE_FLAG)) {

                                          CustomEntryType typ = CustomEntryType.parseEntryType(comment);
                                          entryTypes.put(typ.getName().toLowerCase(), typ);

                                    }
                              } else {
                                    // The entry type was not recognized. This may mean that
                                    // it is a custom entry type whose definition will
                                    // appear
                                    // at the bottom of the file. So we use an
                                    // UnknownEntryType
                                    // to remember the type name by.
                                    tp = new UnknownEntryType(entryType.toLowerCase());
                                    // System.out.println("unknown type: "+entryType);
                                    isEntry = true;
                              }
                        }

                        if (isEntry) // True if not comment, preamble or string.
                        {
                              /**
                               * Morten Alver 13 Aug 2006: Trying to make the parser more
                               * robust. If an exception is thrown when parsing an entry,
                               * drop the entry and try to resume parsing. Add a warning
                               * for the user.
                               * 
                               * An alternative solution is to try rescuing the entry for
                               * which parsing failed, by returning the entry with the
                               * exception and adding it before parsing is continued.
                               */
                              try {
                                    BibtexEntry be = parseEntry(tp);

                                    boolean duplicateKey = _db.insertEntry(be);
                                    if (duplicateKey) // JZTODO lyrics
                                          _pr.addWarning(Globals.lang("duplicate BibTeX key") + ": "
                                                + be.getCiteKey() + " ("
                                                + Globals.lang("grouping may not work for this entry") + ")");
                                    else if (be.getCiteKey() == null || be.getCiteKey().equals("")) {
                                          _pr.addWarning(Globals.lang("empty BibTeX key") + ": "
                                                + be.getAuthorTitleYear(40) + " ("
                                                + Globals.lang("grouping may not work for this entry") + ")");
                                    }
                              } catch (IOException ex) {
                                    ex.printStackTrace();
                                    _pr.addWarning(Globals.lang("Error occured when parsing entry") + ": '"
                                          + ex.getMessage() + "'. " + Globals.lang("Skipped entry."));

                              }
                        }

                        skipWhitespace();
                  }

                  // Before returning the database, update entries with unknown type
                  // based on parsed type definitions, if possible.
                  checkEntryTypes(_pr);

                  return _pr;
            } catch (KeyCollisionException kce) {
                  // kce.printStackTrace();
                  throw new IOException("Duplicate ID in bibtex file: " + kce.toString());
            }
      }

      private int peek() throws IOException {
            int c = read();
            unread(c);

            return c;
      }

      private int read() throws IOException {
            int c = _in.read();
            if (c == '\n')
                  line++;
            return c;
      }

      private void unread(int c) throws IOException {
            if (c == '\n')
                  line--;
            _in.unread(c);
      }

      public BibtexString parseString() throws IOException {
            // Util.pr("Parsing string");
            skipWhitespace();
            consume('{', '(');
            // while (read() != '}');
            skipWhitespace();
            // Util.pr("Parsing string name");
            String name = parseTextToken();
            // Util.pr("Parsed string name");
            skipWhitespace();
            // Util.pr("Now the contents");
            consume('=');
            String content = parseFieldContent(name);
            // Util.pr("Now I'm going to consume a }");
            consume('}', ')');
            // Util.pr("Finished string parsing.");
            String id = Util.createNeutralId();
            return new BibtexString(id, name, content);
      }

      public String parsePreamble() throws IOException {
            return parseBracketedText().toString();
      }

      public BibtexEntry parseEntry(BibtexEntryType tp) throws IOException {
            String id = Util.createNeutralId();// createId(tp, _db);
            BibtexEntry result = new BibtexEntry(id, tp);
            skipWhitespace();
            consume('{', '(');
        int c = peek();
        if ((c != '\n') && (c != '\r'))
            skipWhitespace();
            String key = null;
            boolean doAgain = true;
            while (doAgain) {
                  doAgain = false;
                  try {
                        if (key != null)
                              key = key + parseKey();// parseTextToken(),
                        else
                              key = parseKey();
                  } catch (NoLabelException ex) {
                        // This exception will be thrown if the entry lacks a key
                        // altogether, like in "@article{ author = { ...".
                        // It will also be thrown if a key contains =.
                        c = (char) peek();
                        if (Character.isWhitespace(c) || (c == '{') || (c == '\"')) {
                              String fieldName = ex.getMessage().trim().toLowerCase();
                              String cont = parseFieldContent(fieldName);
                              result.setField(fieldName, cont);
                        } else {
                              if (key != null)
                                    key = key + ex.getMessage() + "=";
                              else
                                    key = ex.getMessage() + "=";
                              doAgain = true;
                        }
                  }
            }

            if ((key != null) && key.equals(""))
                  key = null;

            result.setField(BibtexFields.KEY_FIELD, key);
            skipWhitespace();

            while (true) {
                  c = peek();
                  if ((c == '}') || (c == ')')) {
                        break;
                  }

                  if (c == ',')
                        consume(',');

                  skipWhitespace();

                  c = peek();
                  if ((c == '}') || (c == ')')) {
                        break;
                  }
                  parseField(result);
            }

            consume('}', ')');
            return result;
      }

      private void parseField(BibtexEntry entry) throws IOException {
            String key = parseTextToken().toLowerCase();
            // Util.pr("Field: _"+key+"_");
            skipWhitespace();
            consume('=');
            String content = parseFieldContent(key);
            // Now, if the field in question is set up to be fitted automatically
            // with braces around
            // capitals, we should remove those now when reading the field:
            if (Globals.prefs.putBracesAroundCapitals(key)) {
                  content = Util.removeBracesAroundCapitals(content);
            }
            if (content.length() > 0) {
                  if (entry.getField(key) == null)
                        entry.setField(key, content);
                  else {
                        // The following hack enables the parser to deal with multiple
                        // author or
                        // editor lines, stringing them together instead of getting just
                        // one of them.
                        // Multiple author or editor lines are not allowed by the bibtex
                        // format, but
                        // at least one online database exports bibtex like that, making
                        // it inconvenient
                        // for users if JabRef didn't accept it.
                        if (key.equals("author") || key.equals("editor"))
                              entry.setField(key, entry.getField(key) + " and " + content);
                  }
            }
      }

      private String parseFieldContent(String key) throws IOException {
            skipWhitespace();
            StringBuffer value = new StringBuffer();
            int c = '.';

            while (((c = peek()) != ',') && (c != '}') && (c != ')')) {

                  if (_eof) {
                        throw new RuntimeException("Error in line " + line + ": EOF in mid-string");
                  }
                  if (c == '"') {
                        StringBuffer text = parseQuotedFieldExactly();
                        value.append(fieldContentParser.format(text));
                        /*
                         * 
                         * The following code doesn't handle {"} correctly: // value is
                         * a string consume('"');
                         * 
                         * while (!((peek() == '"') && (j != '\\'))) { j = read(); if
                         * (_eof || (j == -1) || (j == 65535)) { throw new
                         * RuntimeException("Error in line "+line+ ": EOF in
                         * mid-string"); }
                         * 
                         * value.append((char) j); }
                         * 
                         * consume('"');
                         */
                  } else if (c == '{') {
                        // Value is a string enclosed in brackets. There can be pairs
                        // of brackets inside of a field, so we need to count the
                        // brackets to know when the string is finished.
                        StringBuffer text = parseBracketedTextExactly();
                        value.append(fieldContentParser.format(text, key));

                  } else if (Character.isDigit((char) c)) { // value is a number

                        String numString = parseTextToken();
                // Morten Alver 2007-07-04: I don't see the point of parsing the integer
                // and converting it back to a string, so I'm removing the construct below
                // the following line:
                value.append(numString);
                /*
                try {
                              // Fixme: What is this for?
                              value.append(String.valueOf(Integer.parseInt(numString)));
                        } catch (NumberFormatException e) {
                              // If Integer could not be parsed then just add the text
                              // Used to fix [ 1594123 ] Failure to import big numbers
                              value.append(numString);
                        }
                        */
                  } else if (c == '#') {
                        consume('#');
                  } else {
                        String textToken = parseTextToken();
                        if (textToken.length() == 0)
                              throw new IOException("Error in line " + line + " or above: "
                                    + "Empty text token.\nThis could be caused "
                                    + "by a missing comma between two fields.");
                        value.append("#").append(textToken).append("#");
                        // Util.pr(parseTextToken());
                        // throw new RuntimeException("Unknown field type");
                  }
                  skipWhitespace();
            }
            // Util.pr("Returning field content: "+value.toString());

            // Check if we are to strip extra pairs of braces before returning:
            if (Globals.prefs.getBoolean("autoDoubleBraces")) {
                  // Do it:
                  while ((value.length() > 1) && (value.charAt(0) == '{')
                        && (value.charAt(value.length() - 1) == '}')) {
                        value.deleteCharAt(value.length() - 1);
                        value.deleteCharAt(0);
                  }
                  // Problem: if the field content is "{DNA} blahblah {EPA}", one pair
                  // too much will be removed.
                  // Check if this is the case, and re-add as many pairs as needed.
                  while (hasNegativeBraceCount(value.toString())) {
                        value.insert(0, '{');
                        value.append('}');
                  }

            }
            return value.toString();

      }

      /**
       * Originalinhalt nach parseFieldContent(String) verschoben.
       * @return
       * @throws IOException
       */
//    private String parseFieldContent() throws IOException {
//          return parseFieldContent(null);
//    }

      /**
       * Check if a string at any point has had more ending braces (}) than
       * opening ones ({). Will e.g. return true for the string "DNA} blahblal
       * {EPA"
       * 
       * @param s
       *            The string to check.
       * @return true if at any index the brace count is negative.
       */
00646       private boolean hasNegativeBraceCount(String s) {
            // System.out.println(s);
            int i = 0, count = 0;
            while (i < s.length()) {
                  if (s.charAt(i) == '{')
                        count++;
                  else if (s.charAt(i) == '}')
                        count--;
                  if (count < 0)
                        return true;
                  i++;
            }
            return false;
      }

      /**
       * This method is used to parse string labels, field names, entry type and
       * numbers outside brackets.
       */
00665       private String parseTextToken() throws IOException {
            StringBuffer token = new StringBuffer(20);

            while (true) {
                  int c = read();
                  // Util.pr(".. "+c);
                  if (c == -1) {
                        _eof = true;

                        return token.toString();
                  }

                  if (Character.isLetterOrDigit((char) c) || (c == ':') || (c == '-') || (c == '_')
                        || (c == '*') || (c == '+') || (c == '.') || (c == '/') || (c == '\'')) {
                        token.append((char) c);
                  } else {
                        unread(c);
                        // Util.pr("Pasted text token: "+token.toString());
                        return token.toString();
                  }
            }
      }
      
      
      /**
       * Tries to restore the key
       * 
       * @return rest of key on success, otherwise empty string
       * @throws IOException
       *             on Reader-Error
       */
00696     private String fixKey() throws IOException {
        StringBuilder key = new StringBuilder();
        int lookahead_used = 0;
        char currentChar;

        // Find a char which ends key (','&&'\n') or entryfield ('='):
        do {
            currentChar = (char) read();
            key.append(currentChar);
            lookahead_used++;
        } while ((currentChar != ',' && currentChar != '\n' && currentChar != '=')
                && (lookahead_used < LOOKAHEAD));

        // Consumed a char too much, back into reader and remove from key:
        unread(currentChar);
        key.deleteCharAt(key.length() - 1);

        // Restore if possible:
        switch (currentChar) {
            case '=':

                // Get entryfieldname, push it back and take rest as key
                key = key.reverse();

                boolean matchedAlpha = false;
                for (int i = 0; i < key.length(); i++) {
                    currentChar = key.charAt(i);

                    /// Skip spaces:
                    if (!matchedAlpha && currentChar == ' ') {
                        continue;
                    }
                    matchedAlpha = true;

                    // Begin of entryfieldname (e.g. author) -> push back:
                    unread(currentChar);
                    if (currentChar == ' ' || currentChar == '\n') {

                        /*
                         * found whitespaces, entryfieldname completed -> key in
                         * keybuffer, skip whitespaces
                         */
                        StringBuilder newKey = new StringBuilder();
                        for (int j = i; j < key.length(); j++) {
                            currentChar = key.charAt(j);
                            if (!Character.isWhitespace(currentChar)) {
                                newKey.append(currentChar);
                            }
                        }

                        // Finished, now reverse newKey and remove whitespaces:
                        _pr.addWarning(Globals.lang("Line %0: Found corrupted BibTeX-key.",
                                String.valueOf(line)));
                        key = newKey.reverse();
                    }
                }
                break;

            case ',':

                _pr.addWarning(Globals.lang("Line %0: Found corrupted BibTeX-key (contains whitespaces).",
                        String.valueOf(line)));

            case '\n':

                _pr.addWarning(Globals.lang("Line %0: Found corrupted BibTeX-key (comma missing).",
                        String.valueOf(line)));

                break;

            default:

                // No more lookahead, give up:
                unreadBuffer(key);
                return "";
        }

        return removeWhitespaces(key).toString();
    }

      /**
       * removes whitespaces from <code>sb</code>
       * 
       * @param sb
       * @return
       */
00782       private StringBuilder removeWhitespaces(StringBuilder sb) {
            StringBuilder newSb = new StringBuilder();
            char current;
            for (int i = 0; i < sb.length(); ++i) {
                  current = sb.charAt(i);
                  if (!Character.isWhitespace(current))
                        newSb.append(current);
            }
            return newSb;
      }

      /**
       * pushes buffer back into input
       * 
       * @param sb
       * @throws IOException
       *             can be thrown if buffer is bigger than LOOKAHEAD
       */
00800       private void unreadBuffer(StringBuilder sb) throws IOException {
            for (int i = sb.length() - 1; i >= 0; --i) {
                  unread(sb.charAt(i));
            }
      }
      
      
      /**
       * This method is used to parse the bibtex key for an entry.
       */
00810       private String parseKey() throws IOException, NoLabelException {
            StringBuffer token = new StringBuffer(20);

            while (true) {
                  int c = read();
                  // Util.pr(".. '"+(char)c+"'\t"+c);
                  if (c == -1) {
                        _eof = true;

                        return token.toString();
                  }

                  // Ikke: #{}\uFFFD~\uFFFD
                  //
                  // G\uFFFDr: $_*+.-\/?"^
                  if (!Character.isWhitespace((char) c)
                        && (Character.isLetterOrDigit((char) c) || ((c != '#') && (c != '{') && (c != '}')
                              && (c != '\uFFFD') && (c != '~') && (c != '\uFFFD') && (c != ',') && (c != '=')))) {
                        token.append((char) c);
                  } else {

                        if (Character.isWhitespace((char) c)) {
                              // We have encountered white space instead of the comma at
                              // the end of
                              // the key. Possibly the comma is missing, so we try to
                              // return what we
                              // have found, as the key and try to restore the rest in fixKey().
                              return token.toString()+fixKey();
                        } else if (c == ',') {
                              unread(c);
                              return token.toString();
                              // } else if (Character.isWhitespace((char)c)) {
                              // throw new NoLabelException(token.toString());
                        } else if (c == '=') {
                              // If we find a '=' sign, it is either an error, or
                              // the entry lacked a comma signifying the end of the key.

                              return token.toString();
                              // throw new NoLabelException(token.toString());

                        } else
                              throw new IOException("Error in line " + line + ":" + "Character '" + (char) c
                                    + "' is not " + "allowed in bibtex keys.");

                  }
            }

      }

      private class NoLabelException extends Exception {
            public NoLabelException(String hasRead) {
                  super(hasRead);
            }
      }

      private StringBuffer parseBracketedText() throws IOException {
            // Util.pr("Parse bracketed text");
            StringBuffer value = new StringBuffer();

            consume('{');

            int brackets = 0;

            while (!((peek() == '}') && (brackets == 0))) {

                  int j = read();
                  if ((j == -1) || (j == 65535)) {
                        throw new RuntimeException("Error in line " + line + ": EOF in mid-string");
                  } else if (j == '{')
                        brackets++;
                  else if (j == '}')
                        brackets--;

                  // If we encounter whitespace of any kind, read it as a
                  // simple space, and ignore any others that follow immediately.
                  /*
                   * if (j == '\n') { if (peek() == '\n') value.append('\n'); } else
                   */
                  if (Character.isWhitespace((char) j)) {
                        String whs = skipAndRecordWhitespace(j);

                        // System.out.println(":"+whs+":");

                        if (!whs.equals("") && !whs.equals("\n\t")) { // &&
                                                                                                // !whs.equals("\n"))

                              whs = whs.replaceAll("\t", ""); // Remove tabulators.

                              // while (whs.endsWith("\t"))
                              // whs = whs.substring(0, whs.length()-1);

                              value.append(whs);

                        } else {
                              value.append(' ');
                        }

                  } else
                        value.append((char) j);

            }

            consume('}');

            return value;
      }

      private StringBuffer parseBracketedTextExactly() throws IOException {

            StringBuffer value = new StringBuffer();

            consume('{');

            int brackets = 0;

            while (!((peek() == '}') && (brackets == 0))) {

                  int j = read();
                  if ((j == -1) || (j == 65535)) {
                        throw new RuntimeException("Error in line " + line + ": EOF in mid-string");
                  } else if (j == '{')
                        brackets++;
                  else if (j == '}')
                        brackets--;

                  value.append((char) j);

            }

            consume('}');

            return value;
      }

      private StringBuffer parseQuotedFieldExactly() throws IOException {

            StringBuffer value = new StringBuffer();

            consume('"');

            int brackets = 0;

            while (!((peek() == '"') && (brackets == 0))) {

                  int j = read();
                  if ((j == -1) || (j == 65535)) {
                        throw new RuntimeException("Error in line " + line + ": EOF in mid-string");
                  } else if (j == '{')
                        brackets++;
                  else if (j == '}')
                        brackets--;

                  value.append((char) j);

            }

            consume('"');

            return value;
      }

      private void consume(char expected) throws IOException {
            int c = read();

            if (c != expected) {
                  throw new RuntimeException("Error in line " + line + ": Expected " + expected
                        + " but received " + (char) c);
            }

      }

      private boolean consumeUncritically(char expected) throws IOException {
            int c;
            while (((c = read()) != expected) && (c != -1) && (c != 65535)){
                // do nothing
            }
                  
            if ((c == -1) || (c == 65535))
                  _eof = true;

            // Return true if we actually found the character we were looking for:
            return c == expected;
      }

      private void consume(char expected1, char expected2) throws IOException {
            // Consumes one of the two, doesn't care which appears.

            int c = read();

            if ((c != expected1) && (c != expected2)) {
                  throw new RuntimeException("Error in line " + line + ": Expected " + expected1 + " or "
                        + expected2 + " but received " + c);

            }

      }

      public void checkEntryTypes(ParserResult _pr) {
            
            for (BibtexEntry be : _db.getEntries()){
                  if (be.getType() instanceof UnknownEntryType) {
                        // Look up the unknown type name in our map of parsed types:

                        Object o = entryTypes.get(be.getType().getName().toLowerCase());
                        if (o != null) {
                              BibtexEntryType type = (BibtexEntryType) o;
                              be.setType(type);
                        } else {
                              // System.out.println("Unknown entry type:
                              // "+be.getType().getName());
                              _pr
                                    .addWarning(Globals.lang("unknown entry type") + ": "
                                          + be.getType().getName() + ". " + Globals.lang("Type set to 'other'")
                                          + ".");
                              be.setType(BibtexEntryType.OTHER);
                        }
                  }
            }
      }

    /**
     * Read the JabRef signature, if any, and find what version number is given.
     * This method advances the file reader only as far as the end of the first line of
     * the JabRef signature, or up until the point where the read characters don't match
     * the signature. This should ensure that the parser can continue from that spot without
     * resetting the reader, without the risk of losing important contents.
     *
     * @return The version number, or null if not found.
     * @throws IOException
     */
01040     private String readJabRefVersionNumber() throws IOException {
        StringBuffer headerText = new StringBuffer();
        
        boolean keepon = true;
        int piv = 0;
        int c;

        // We start by reading the standard part of the signature, which precedes
        // the version number:
        //                     This file was created with JabRef X.y.
        while (keepon) {
            c = peek();
            headerText.append((char) c);
            if ((piv == 0) && (Character.isWhitespace((char) c) || (c == '%')))
                read();
            else if (c == GUIGlobals.SIGNATURE.charAt(piv)) {
                piv++;
                read();
            }
            else {
                keepon = false;
                return null;
            }

            // Check if we've reached the end of the signature's standard part:
            if (piv == GUIGlobals.SIGNATURE.length()) {
                keepon = false;

                // Found the standard part. Now read the version number:
                StringBuilder sb = new StringBuilder();
                while (((c=read()) != '\n') && (c != -1))
                    sb.append((char)c);
                String versionNum = sb.toString().trim();
                // See if it fits the X.y. pattern:
                if (Pattern.compile("[1-9]+\\.[1-9A-Za-z ]+\\.").matcher(versionNum).matches()) {
                    // It matched. Remove the last period and return:
                    return versionNum.substring(0, versionNum.length()-1);
                }

            }
        }

        return null;
    }

    /**
     * After a JabRef version number has been parsed and put into _pr,
     * parse the version number to determine the JabRef major and minor version
     * number
     */
01090     private void setMajorMinorVersions() {
        String v = _pr.getJabrefVersion();
        Pattern p = Pattern.compile("([0-9]+)\\.([0-9]+).*");
        Matcher m = p.matcher(v);
        if (!m.matches())
            return;
        if (m.groupCount() >= 2) {
            _pr.setJabrefMajorVersion(Integer.parseInt(m.group(1)));
            _pr.setJabrefMinorVersion(Integer.parseInt(m.group(2)));
        }
    }
}

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