tokens-sow.js

//     wink-nlp-utils
//     NLP Functions for amplifying negations, managing elisions,
//     creating ngrams, stems, phonetic codes to tokens and more.
//
//     Copyright (C) 2017-18  GRAYPE Systems Private Limited
//
//     This file is part of “wink-nlp-utils”.
//
//     Permission is hereby granted, free of charge, to any person obtaining a
//     copy of this software and associated documentation files (the "Software"),
//     to deal in the Software without restriction, including without limitation
//     the rights to use, copy, modify, merge, publish, distribute, sublicense,
//     and/or sell copies of the Software, and to permit persons to whom the
//     Software is furnished to do so, subject to the following conditions:
//
//     The above copyright notice and this permission notice shall be included
//     in all copies or substantial portions of the Software.
//
//     THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
//     OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//     FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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//     DEALINGS IN THE SOFTWARE.

//

// ## string

// ### setOfWords
/**
 *
 * Generates the set of words from the input string. It also has an alias **`sow()`**.
 *
 * @alias tokens#setOfWords
 * @param {string[]} tokens the input tokens.
 * @param {function} [ifn=undefined] a function to build index; it is called for
 * every **member word of the set **; and it receives the word and the `idx`
 * as input arguments. The `build()` function of [helper.returnIndexer](#helperreturnindexer)
 * may be used as `ifn`. If `undefined` then index is not built.
 * @param {number} [idx=undefined] the index; passed as the second argument to the `ifn`
 * function.
 * @return {set} of words from tokens.
 * @example
 * setOfWords( [ 'rain', 'rain', 'go', 'away' ] );
 * // -> Set { 'rain', 'go', 'away' }
 */
var setOfWords = function ( tokens, ifn, idx ) {
  var tset = new Set( tokens );
  if ( typeof ifn === 'function' ) {
    tset.forEach( function ( m ) {
        ifn( m, idx );
    } );
  }
  return ( tset );
}; // bow()

module.exports = setOfWords;