textract/lib/extractors/docx.js

Extracting text from files of various type including html, pdf, doc, docx, xls, xlsx, csv, pptx, png, jpg, gif, rtf, text/*, and various open office.

var xpath = require( 'xpath' )
  , Dom = require( 'xmldom' ).DOMParser
  , yauzl = require( 'yauzl' )
  , util = require( '../util' )
  , includeRegex = /.xml$/
  , excludeRegex = /^(word\/media\/|word\/_rels\/)/
  ;

function _calculateExtractedText( inText, preserveLineBreaks ) {
  var doc = new Dom().parseFromString( inText )
    , ps = xpath.select( "//*[local-name()='p']", doc )
    , text = ''
    ;

  ps.forEach( function( paragraph ) {
    var ts
      , localText = ''
      ;

    paragraph = new Dom().parseFromString( paragraph.toString() );
    ts = xpath.select(
      "//*[local-name()='t' or local-name()='tab' or local-name()='br']", paragraph );
    ts.forEach( function( t ) {
      if ( t.localName === 't' && t.childNodes.length > 0 ) {
        localText += t.childNodes[0].data;
      } else {
        if ( t.localName === 'tab' ) {
          localText += ' ';
        } else if ( t.localName === 'br' ) {
          if ( preserveLineBreaks !== true ) {
            localText += ' ';
          } else {
            localText += '\n';
          }
        }
      }
    });
    text += localText + '\n';
  });

  return text;
}

function extractText( filePath, options, cb ) {
  var result = '';

  yauzl.open( filePath, function( err, zipfile ) {
    var processEnd
      , processedEntries = 0
      ;

    if ( err ) {
      util.yauzlError( err, cb );
      return;
    }

    processEnd = function() {
      var text;
      if ( zipfile.entryCount === ++processedEntries ) {
        if ( result.length ) {
          text = _calculateExtractedText( result, options.preserveLineBreaks );
          cb( null, text );
        } else {
          cb( new Error(
            'Extraction could not find content in file, are you' +
            ' sure it is the mime type it says it is?' ),
            null );
        }
      }
    };

    zipfile.on( 'entry', function( entry ) {
      if ( includeRegex.test( entry.fileName ) && !excludeRegex.test( entry.fileName ) ) {
        util.getTextFromZipFile( zipfile, entry, function( err2, text ) {
          result += text + '\n';
          processEnd();
        });
      } else {
        processEnd();
      }
    });

    zipfile.on( 'error', function( err3 ) {
      cb( err3 );
    });
  });
}

module.exports = {
  types: ['application/vnd.openxmlformats-officedocument.wordprocessingml.document'],
  extract: extractText
};