// wink-nlp-utils
// NLP Functions for amplifying negations, managing elisions,
// creating ngrams, stems, phonetic codes to tokens and more.
//
// Copyright (C) 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
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
var removeElisions = require( './string-remove-elisions.js' );
var amplifyNotElision = require( './string-amplify-not-elision.js' );
var rgx = require( './util_regexes.js' );
// ## string
// ### tokenize0
/**
*
* Tokenizes by splitting the input string on **non-words**. This means tokens would
* consists of only alphas, numerals and underscores; all other characters will
* be stripped as they are treated as separators. It also removes all elisions;
* however negations are retained and amplified.
*
* @alias string#tokenize0
* @param {string} str the input string.
* @return {string[]} of tokens.
* @example
* tokenize0( "someone's wallet, isn't it?" );
* // -> [ 'someone', 's', 'wallet', 'is', 'not', 'it' ]
*/
var tokenize0 = function ( str ) {
var tokens = removeElisions( amplifyNotElision( str ) )
.replace( rgx.cannot, '$1 $2' )
.split( rgx.nonWords );
// Check the 0th and last element of array for empty string because if
// fisrt/last characters are non-words then these will be empty stings!
if ( tokens[ 0 ] === '' ) tokens.shift();
if ( tokens[ tokens.length - 1 ] === '' ) tokens.pop();
return tokens;
}; // tokenize0()
module.exports = tokenize0;