Parser.js

/**
 * Parser.js
 * Copyright 2012-13 Mayank Lahiri
 * mlahiri@gmail.com
 * Released under the BSD License.
 *
 * A forgiving Bibtex parser that can:
 * 
 * (1) operate in streaming or block mode, extracting entries as dictionaries. 
 * (2) convert Latex special characters to UTF-8.
 * (3) best-effort parse malformed entries.
 * (4) run in a CommonJS environment or a browser, without any dependencies.
 * (5) be advanced-compiled by Google Closure Compiler.
 * 
 * Handwritten as a labor of love, not auto-generated from a grammar. 
 *
 * Modes of usage:
 *
 * (1) Synchronous, string
 *
 *   var entries = BibtexParser(text);
 *   console.log(entries);
 *
 * (2) Asynchronous, stream
 *
 *   var entryCallback = function(entry) { console.log(entry); }
 *   var parser = new BibtexParser(entryCallback);
 *   parser.parse(chunk1);
 *   parser.parse(chunk2);
 *   ...
 * 
 * @param {text|function(Object)} arg Either a Bibtex string or callback 
 *                                    function for processing parsed entries.
 * @constructor
 */
function BibtexParser(arg0) {
  // Determine how this function is to be used
  if (typeof arg0 == 'string') {
    // Passed a string, synchronous call without 'new'
    var tempStorage = {};
    var entries = [];
    function accumulator(entry) {
      entries.push(entry);
    }
    var parser = BibtexParser.call(tempStorage, accumulator);
    parser.parse(arg0);
    return {
      'entries':    entries,
      'errors':     parser.getErrors()
    }
  }
  if (typeof arg0 != 'function') {
    throw 'Invalid parser construction.';
  }

  /** @enum {number} */
  this.STATES_ = {
    ENTRY_OR_JUNK:    0,
    OBJECT_TYPE:      1,
    ENTRY_KEY:        2, 
    KV_KEY:           3, 
    EQUALS:           4,
    KV_VALUE:         5 
  }
  /** @private */ this.DATA_          = {};
  /** @private */ this.CALLBACK_      = arg0;
  /** @private */ this.CHAR_          = 0;
  /** @private */ this.LINE_          = 1;
  /** @private */ this.CHAR_IN_LINE_  = 0;
  /** @private */ this.SKIPWS_        = true;
  /** @private */ this.SKIPCOMMENT_   = true;
  /** @private */ this.PARSETMP_      = {};
  /** @private */ this.SKIPTILLEOL_   = false;
  /** @private */ this.VALBRACES_     = null;
  /** @private */ this.BRACETYPE_     = null;
  /** @private */ this.BRACECOUNT_    = 0;
  /** @private */ this.STATE_         = this.STATES_.ENTRY_OR_JUNK;
  /** @private */ this.ERRORS_        = [];
  /** @private */ this.ENTRY_TYPES_   = {
    'inproceedings'     : 1,
    'proceedings'       : 2,
    'article'           : 3,
    'techreport'        : 4,
    'misc'              : 5,
    'mastersthesis'     : 6,
    'book'              : 7,
    'phdthesis'         : 8,
    'incollection'      : 9,
    'unpublished'       : 10,
    'inbook'            : 11,
    'manual'            : 12,
    'periodical'        : 13,
    'booklet'           : 14,
    'masterthesis'      : 15,
    'conference'        : 16,
    'online'            : 17
  }
  /** @private */ this.MACROS_        = {
    'jan'               : 'January',
    'feb'               : 'February',
    'mar'               : 'March',
    'apr'               : 'April',
    'may'               : 'May',
    'jun'               : 'June',
    'jul'               : 'July',
    'aug'               : 'August',
    'sep'               : 'September',
    'oct'               : 'October',
    'nov'               : 'November',
    'dec'               : 'December',
    'Jan'               : 'January',
    'Feb'               : 'February',
    'Mar'               : 'March',
    'Apr'               : 'April',
    'May'               : 'May',
    'Jun'               : 'June',
    'Jul'               : 'July',
    'Aug'               : 'August',
    'Sep'               : 'September',
    'Oct'               : 'October',
    'Nov'               : 'November',
    'Dec'               : 'December'
  }

  /**
   * Gets an array of all errors encountered during parsing.
   * Array entries are of the format:
   *  [ line number, character in line, character in stream, error text ]
   *
   * @returns Array<Array>
   * @public
   */
  this.getErrors = function() {
    return this.ERRORS_;
  }

  /**
   * Processes a chunk of data
   * @public
   */
  this.parse = function(chunk) {
    for (var i = 0; i < chunk.length; i++)
      this.processCharacter_(chunk[i]);
  }

  /**
   * Logs error at current stream position.
   *
   * @private
   */
  this.error_ = function(text) {
    this.ERRORS_.push([ this.LINE_, 
                        this.CHAR_IN_LINE_,
                        this.CHAR_,
                        text ])
  }

  /**
   * Called after an entire entry has been parsed from the stream.
   * Performs post-processing and invokes the entry callback pointed to by
   * this.CALLBACK_. Parsed (but unprocessed) entry data is in this.DATA_.
   */
  this.processEntry_ = function() {
    var data = this.DATA_;
    if (data.Fields) 
      for (var f in data.Fields) {
        var raw = data.Fields[f];

        // Convert Latex/Bibtex special characters to UTF-8 equivalents
        for (var i = 0; i < this.CHARCONV_.length; i++) {
          var re = this.CHARCONV_[i][0];
          var rep = this.CHARCONV_[i][1];
          raw = raw.replace(re, rep);
        }

        // Basic substitutions
        raw = raw.replace(/[\n\r\t]/g, ' ')
                 .replace(/\s\s+/g, ' ')
                 .replace(/^\s+|\s+$/g, '')

        // Remove braces and backslashes
        var len = raw.length;
        var processed = '';
        for (var i = 0; i < len; i++) {
          var c = raw[i];
          var skip = false;
          if (c == '\\' && i < len-1) 
            c = raw[++i];
          else {
            if (c == '{' || c == '}')
              skip = true;
          }
          if (!skip)
            processed += c;
        }
        data.Fields[f] = processed
      }

    if (data.ObjectType == 'string') {
      for (var f in data.Fields) {  
        this.MACROS_[f] = data.Fields[f];
      }
    } else {
      // Parsed a new Bibtex entry
      this.CALLBACK_(data);
    }
  }


  /**
   * Processes next character in the stream, invoking the callback after 
   * each entry has been found and processed.
   * 
   * @private
   * @param {string} c Next character in input stream
   */
  this.processCharacter_ = function(c) {
    // Housekeeping
    this.CHAR_++;
    this.CHAR_IN_LINE_++;
    if (c == '\n') {
      this.LINE_++;
      this.CHAR_IN_LINE_ = 1;
    }

    // Convenience states for skipping whitespace when needed
    if (this.SKIPTILLEOL_) {
      if (c == '\n')
        this.SKIPTILLEOL_ = false;
      return;
    }
    if (this.SKIPCOMMENT_ && c == '%') {
      this.SKIPTILLEOL_ = true;
      return;
    }
    if (this.SKIPWS_ && /\s/.test(c))
      return;
    this.SKIPWS_ = false;
    this.SKIPCOMMENT_ = false;
    this.SKIPTILLEOL_ = false;

    // Main state machine
    var AnotherIteration = true;
    while (AnotherIteration) {
      //console.log(this.LINE_, this.CHAR_IN_LINE_, this.STATE_, c)
      AnotherIteration = false;
      switch(this.STATE_) {
        // -- Scan for an object marker ('@')
        // -- Reset temporary data structure in case previous entry was garbled
        case this.STATES_.ENTRY_OR_JUNK:
          if (c == '@') {
            // SUCCESS:     Parsed a valid start-of-object marker.
            // NEXT_STATE:  OBJECT_TYPE
            this.STATE_ = this.STATES_.OBJECT_TYPE;
            this.DATA_ = {
              ObjectType    : ''
            };
          }
          this.BRACETYPE_   = null;
          this.SKIPWS_      = true;
          this.SKIPCOMMENT_ = true;
          break;

        // Start at first non-whitespace character after start-of-object '@'
        // -- Accept [A-Za-z], break on non-matching character
        // -- Populate this.DATA_.EntryType and this.DATA_.ObjectType
        case this.STATES_.OBJECT_TYPE:
          if (/[A-Za-z]/.test(c)) {
            this.DATA_.ObjectType += c.toLowerCase();
            this.SKIPWS_      = true;
            this.SKIPCOMMENT_ = true;
          } else {
            // Break from state and validate object type
            var ot = this.DATA_.ObjectType;
            if (ot == 'comment') {
              this.STATE_ = this.STATES_.ENTRY_OR_JUNK;
            } else {
              if (ot == 'string') {
                this.DATA_.ObjectType = ot;
                this.DATA_.Fields = {};
                this.BRACETYPE_ = c;
                this.BRACECOUNT_ = 1;
                this.STATE_ = this.STATES_.KV_KEY;
                this.SKIPWS_      = true;
                this.SKIPCOMMENT_ = true;
                this.PARSETMP_ = {
                  Key:    ''
                }
              } else {
                if (ot == 'preamble') {
                  this.STATE_ = this.STATES_.ENTRY_OR_JUNK;
                } else {
                  if (ot in this.ENTRY_TYPES_) {
                    // SUCCESS:     Parsed a valid object type.
                    // NEXT_STATE:  ENTRY_KEY
                    this.DATA_.ObjectType = 'entry';
                    this.DATA_.EntryType  = ot;
                    this.DATA_.EntryKey   = '';
                    this.STATE_           = this.STATES_.ENTRY_KEY;
                    AnotherIteration      = true;
                  } else {
                    // ERROR:       Unrecognized object type.
                    // NEXT_STATE:  ENTRY_OR_JUNK
                    this.error_('Unrecognized object type: "' +
                                this.DATA_.ObjectType + '"')
                    this.STATE_ = this.STATES_.ENTRY_OR_JUNK;
                  }
                }
              }
            }
          }
          break;

          // Start at first non-alphabetic character after an entry type
          // -- Populate this.DATA_.EntryKey
          case this.STATES_.ENTRY_KEY:
            if ((c === '{' || c === '(') && this.BRACETYPE_ == null) {
              this.BRACETYPE_   = c;
              this.BRACECOUNT_  = 1;
              this.SKIPWS_      = true;
              this.SKIPCOMMENT_ = true;
              break;
            }
            if (/[,%\s]/.test(c)) {
              if (this.DATA_.EntryKey.length < 1) { 
                // Skip comments and whitespace before entry key
                this.SKIPWS_      = true;
                this.SKIPCOMMENT_ = true;
              } else {
                if (this.BRACETYPE_ == null) {
                  // ERROR:       No opening brace for object
                  // NEXT_STATE:  ENTRY_OR_JUNK
                  this.error_('No opening brace for object.');
                  this.STATE_ = this.STATES_.ENTRY_OR_JUNK;
                } else {
                  // SUCCESS:     Parsed an entry key
                  // NEXT_STATE:  KV_KEY
                  this.SKIPWS_      = true;
                  this.SKIPCOMMENT_ = true;
                  AnotherIteration  = true;
                  this.STATE_       = this.STATES_.KV_KEY;
                  this.PARSETMP_.Key= '';
                  this.DATA_.Fields = {};
                }
              }
            } else {
              this.DATA_.EntryKey += c;
              this.SKIPWS_        = false;
              this.SKIPCOMMENT_   = false;
            }
            break;

          // Start at first non-whitespace/comment character after entry key.
          // -- Populate this.PARSETMP_.Key
          case this.STATES_.KV_KEY:
            // Test for end of entry
            if ((c == '}' && this.BRACETYPE_ == '{') ||
                (c == ')' && this.BRACETYPE_ == '(')) {
              // SUCCESS:       Parsed an entry, possible incomplete
              // NEXT_STATE:    ENTRY_OR_JUNK
              this.processEntry_();
              this.SKIPWS_      = true;
              this.SKIPCOMMENT_ = true;
              this.STATE_ = this.STATES_.ENTRY_OR_JUNK;
              break;
            }
            if (/[\-A-Za-z:]/.test(c)) {
              // Add to key
              this.PARSETMP_.Key  += c;
              this.SKIPWS_        = false;
              this.SKIPCOMMENT_   = false;
            } else {
              // Either end of key or we haven't encountered start of key
              if (this.PARSETMP_.Key.length < 1) {
                // Keep going till we see a key
                this.SKIPWS_      = true;
                this.SKIPCOMMENT_ = true;
              } else {
                // SUCCESS:       Found full key in K/V pair
                // NEXT_STATE:    EQUALS
                this.SKIPWS_      = true;
                this.SKIPCOMMENT_ = true;
                this.STATE_       = this.STATES_.EQUALS;
                AnotherIteration  = true;
              }
            }
            break;

          // Start at first non-alphabetic character after K/V pair key.
          case this.STATES_.EQUALS:
            if ((c == '}' && this.BRACETYPE_ == '{') ||
                (c == ')' && this.BRACETYPE_ == '(')) {
              // ERROR:         K/V pair with key but no value
              // NEXT_STATE:    ENTRY_OR_JUNK
              this.error_('Key-value pair has key "' +
                          this.PARSETMP_.Key + '", but no value.');
              this.processEntry_();
              this.SKIPWS_      = true;
              this.SKIPCOMMENT_ = true;
              this.STATE_ = this.STATES_.ENTRY_OR_JUNK;
              break;
            }
            if (c == '=') {
              // SUCCESS:       found an equal signs separating key and value
              // NEXT_STATE:    KV_VALUE
              this.SKIPWS_          = true;
              this.SKIPCOMMENT_     = true;
              this.STATE_           = this.STATES_.KV_VALUE;
              this.PARSETMP_.Value  = '';
              this.VALBRACES_       = { '"' : [], '{' : [] };
            }
            break;

          // Start at first non-whitespace/comment character after '=' 
          // -- Populate this.PARSETMP_.Value
          case this.STATES_.KV_VALUE:
            var delim             = this.VALBRACES_;
            var val               = this.PARSETMP_.Value;
            var doneParsingValue  = false;

            // Test for special characters
            if (c == '"' || c == '{' || c == '}' || c == ',') {
              if (c == ',') {
                // This comma can mean:
                // (1) just another comma literal
                // (2) end of a macro reference
                if (0 === delim['"'].length + delim['{'].length) {
                  // end of a macro reference
                  var macro = this.PARSETMP_.Value.trim();
                  if (macro in this.MACROS_) {
                    // Successful macro reference
                    this.PARSETMP_.Value = this.MACROS_[macro];
                  } else {
                    // Reference to an undefined macro
                    this.error_('Reference to an undefined macro: '+macro);
                  }
                  doneParsingValue = true;
                }
              }
              if (c == '"') {
                // This quote can mean:
                // (1) opening delimiter
                // (2) closing delimiter
                // (3) literal, if we have a '{' on the stack
                if (0 === delim['"'].length + delim['{'].length) {
                  // opening delimiter
                  delim['"'].push(this.CHAR_)
                  this.SKIPWS_        = false;
                  this.SKIPCOMMENT_   = false;
                  break;
                }
                if (delim['"'].length == 1 && delim['{'].length == 0 &&
                    (val.length==0 || val[val.length-1] != '\\')) {
                  // closing delimiter
                  doneParsingValue = true;
                } else {
                  // literal, add to value
                }
              }
              if (c == '{') {
                // This brace can mean:
                // (1) opening delimiter
                // (2) stacked verbatim delimiter
                if (val.length == 0 || val[val.length-1] != '\\') {
                  delim['{'].push(this.CHAR_)
                  this.SKIPWS_        = false;
                  this.SKIPCOMMENT_   = false;
                } else {
                  // literal, add to value
                }
              }
              if (c == '}') {
                // This brace can mean:
                // (1) closing delimiter
                // (2) closing stacked verbatim delimiter
                // (3) end of object definition if value was a macro
                if (0 === delim['"'].length + delim['{'].length) {
                  // end of object definition, after macro
                  var macro = this.PARSETMP_.Value.trim();
                  if (macro in this.MACROS_) {
                    // Successful macro reference
                    this.PARSETMP_.Value = this.MACROS_[macro];
                  } else {
                    // Reference to an undefined macro
                    this.error_('Reference to an undefined macro: '+macro);
                  }
                  AnotherIteration = true;
                  doneParsingValue = true;
                } else {
                  if (val.length == 0 || val[val.length-1] != '\\') {
                    if (delim['{'].length > 0) {
                      // pop stack for stacked verbatim delimiter
                      delim['{'].splice(delim['{'].length-1, 1)
                      if (0 == delim['{'].length + delim['"'].length) {
                        // closing delimiter
                        doneParsingValue = true;
                      } else {
                        // end verbatim block
                      }
                    }
                  } else {
                    // literal, add to value
                  }
                }
              }
            }

            // If here, then we are either done parsing the value or 
            // have a literal that should be added to the value.
            if (doneParsingValue) {
              // SUCCESS:     value parsed
              // NEXT_STATE:  KV_KEY
              this.SKIPWS_        = true;
              this.SKIPCOMMENT_   = true;
              this.STATE_         = this.STATES_.KV_KEY;
              this.DATA_.Fields[this.PARSETMP_.Key] = this.PARSETMP_.Value;
              this.PARSETMP_      = { Key: '' };
              this.VALBRACES_     = null;
            } else {
              this.PARSETMP_.Value += c;
            }
            break;
      } // end switch (this.STATE_)
    } // end while(AnotherIteration)
  } // end function processCharacter 

  /** @private */ this.CHARCONV_ = [
    [ /\\space /g, '\u0020' ],
    [ /\\textdollar /g, '\u0024' ],
    [ /\\textquotesingle /g, '\u0027' ],
    [ /\\ast /g, '\u002A' ],
    [ /\\textbackslash /g, '\u005C' ],
    [ /\\\^\{\}/g, '\u005E' ],
    [ /\\textasciigrave /g, '\u0060' ],
    [ /\\lbrace /g, '\u007B' ],
    [ /\\vert /g, '\u007C' ],
    [ /\\rbrace /g, '\u007D' ],
    [ /\\textasciitilde /g, '\u007E' ],
    [ /\\textexclamdown /g, '\u00A1' ],
    [ /\\textcent /g, '\u00A2' ],
    [ /\\textsterling /g, '\u00A3' ],
    [ /\\textcurrency /g, '\u00A4' ],
    [ /\\textyen /g, '\u00A5' ],
    [ /\\textbrokenbar /g, '\u00A6' ],
    [ /\\textsection /g, '\u00A7' ],
    [ /\\textasciidieresis /g, '\u00A8' ],
    [ /\\textcopyright /g, '\u00A9' ],
    [ /\\textordfeminine /g, '\u00AA' ],
    [ /\\guillemotleft /g, '\u00AB' ],
    [ /\\lnot /g, '\u00AC' ],
    [ /\\textregistered /g, '\u00AE' ],
    [ /\\textasciimacron /g, '\u00AF' ],
    [ /\\textdegree /g, '\u00B0' ],
    [ /\\pm /g, '\u00B1' ],
    [ /\\textasciiacute /g, '\u00B4' ],
    [ /\\mathrm\{\\mu\}/g, '\u00B5' ],
    [ /\\textparagraph /g, '\u00B6' ],
    [ /\\cdot /g, '\u00B7' ],
    [ /\\c\{\}/g, '\u00B8' ],
    [ /\\textordmasculine /g, '\u00BA' ],
    [ /\\guillemotright /g, '\u00BB' ],
    [ /\\textonequarter /g, '\u00BC' ],
    [ /\\textonehalf /g, '\u00BD' ],
    [ /\\textthreequarters /g, '\u00BE' ],
    [ /\\textquestiondown /g, '\u00BF' ],
    [ /\\`\{A\}/g, '\u00C0' ],
    [ /\\'\{A\}/g, '\u00C1' ],
    [ /\\\^\{A\}/g, '\u00C2' ],
    [ /\\~\{A\}/g, '\u00C3' ],
    [ /\\"\{A\}/g, '\u00C4' ],
    [ /\\AA /g, '\u00C5' ],
    [ /\\AE /g, '\u00C6' ],
    [ /\\c\{C\}/g, '\u00C7' ],
    [ /\\`\{E\}/g, '\u00C8' ],
    [ /\\'\{E\}/g, '\u00C9' ],
    [ /\\\^\{E\}/g, '\u00CA' ],
    [ /\\"\{E\}/g, '\u00CB' ],
    [ /\\`\{I\}/g, '\u00CC' ],
    [ /\\'\{I\}/g, '\u00CD' ],
    [ /\\\^\{I\}/g, '\u00CE' ],
    [ /\\"\{I\}/g, '\u00CF' ],
    [ /\\DH /g, '\u00D0' ],
    [ /\\~\{N\}/g, '\u00D1' ],
    [ /\\`\{O\}/g, '\u00D2' ],
    [ /\\'\{O\}/g, '\u00D3' ],
    [ /\\\^\{O\}/g, '\u00D4' ],
    [ /\\~\{O\}/g, '\u00D5' ],
    [ /\\"\{O\}/g, '\u00D6' ],
    [ /\\texttimes /g, '\u00D7' ],
    [ /\\O /g, '\u00D8' ],
    [ /\\`\{U\}/g, '\u00D9' ],
    [ /\\'\{U\}/g, '\u00DA' ],
    [ /\\\^\{U\}/g, '\u00DB' ],
    [ /\\"\{U\}/g, '\u00DC' ],
    [ /\\'\{Y\}/g, '\u00DD' ],
    [ /\\TH /g, '\u00DE' ],
    [ /\\ss /g, '\u00DF' ],
    [ /\\`\{a\}/g, '\u00E0' ],
    [ /\\'\{a\}/g, '\u00E1' ],
    [ /\\\^\{a\}/g, '\u00E2' ],
    [ /\\~\{a\}/g, '\u00E3' ],
    [ /\\"\{a\}/g, '\u00E4' ],
    [ /\\aa /g, '\u00E5' ],
    [ /\\ae /g, '\u00E6' ],
    [ /\\c\{c\}/g, '\u00E7' ],
    [ /\\`\{e\}/g, '\u00E8' ],
    [ /\\'\{e\}/g, '\u00E9' ],
    [ /\\\^\{e\}/g, '\u00EA' ],
    [ /\\"\{e\}/g, '\u00EB' ],
    [ /\\`\{\\i\}/g, '\u00EC' ],
    [ /\\'\{\\i\}/g, '\u00ED' ],
    [ /\\\^\{\\i\}/g, '\u00EE' ],
    [ /\\"\{\\i\}/g, '\u00EF' ],
    [ /\\dh /g, '\u00F0' ],
    [ /\\~\{n\}/g, '\u00F1' ],
    [ /\\`\{o\}/g, '\u00F2' ],
    [ /\\'\{o\}/g, '\u00F3' ],
    [ /\\\^\{o\}/g, '\u00F4' ],
    [ /\\~\{o\}/g, '\u00F5' ],
    [ /\\"\{o\}/g, '\u00F6' ],
    [ /\\div /g, '\u00F7' ],
    [ /\\o /g, '\u00F8' ],
    [ /\\`\{u\}/g, '\u00F9' ],
    [ /\\'\{u\}/g, '\u00FA' ],
    [ /\\\^\{u\}/g, '\u00FB' ],
    [ /\\"\{u\}/g, '\u00FC' ],
    [ /\\'\{y\}/g, '\u00FD' ],
    [ /\\th /g, '\u00FE' ],
    [ /\\"\{y\}/g, '\u00FF' ],
    [ /\\=\{A\}/g, '\u0100' ],
    [ /\\=\{a\}/g, '\u0101' ],
    [ /\\u\{A\}/g, '\u0102' ],
    [ /\\u\{a\}/g, '\u0103' ],
    [ /\\k\{A\}/g, '\u0104' ],
    [ /\\k\{a\}/g, '\u0105' ],
    [ /\\'\{C\}/g, '\u0106' ],
    [ /\\'\{c\}/g, '\u0107' ],
    [ /\\\^\{C\}/g, '\u0108' ],
    [ /\\\^\{c\}/g, '\u0109' ],
    [ /\\.\{C\}/g, '\u010A' ],
    [ /\\.\{c\}/g, '\u010B' ],
    [ /\\v\{C\}/g, '\u010C' ],
    [ /\\v\{c\}/g, '\u010D' ],
    [ /\\v\{D\}/g, '\u010E' ],
    [ /\\v\{d\}/g, '\u010F' ],
    [ /\\DJ /g, '\u0110' ],
    [ /\\dj /g, '\u0111' ],
    [ /\\=\{E\}/g, '\u0112' ],
    [ /\\=\{e\}/g, '\u0113' ],
    [ /\\u\{E\}/g, '\u0114' ],
    [ /\\u\{e\}/g, '\u0115' ],
    [ /\\.\{E\}/g, '\u0116' ],
    [ /\\.\{e\}/g, '\u0117' ],
    [ /\\k\{E\}/g, '\u0118' ],
    [ /\\k\{e\}/g, '\u0119' ],
    [ /\\v\{E\}/g, '\u011A' ],
    [ /\\v\{e\}/g, '\u011B' ],
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  return this;
} // end function BibtexParser

if (typeof module !== 'undefined' && module.exports) {
  module.exports = BibtexParser;
}