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* @license Apache-2.0
*
* Copyright (c) 2018 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var isStringArray = require( '@stdlib/assert/is-string-array' );
var uppercase = require( '@stdlib/string/uppercase' );
var isBoolean = require( '@stdlib/assert/is-boolean' ).isPrimitive;
var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
var tokenize = require( '@stdlib/nlp/tokenize' );
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* Removes a list of words from a string.
*
* @param {string} str - input string
* @param {StringArray} words - array of words to be removed
* @param {boolean} [ignoreCase=false] - boolean indicating whether to perform a case-insensitive operation
* @throws {TypeError} first argument must be a string
* @throws {TypeError} second argument must be an array of strings
* @throws {TypeError} third argument must be a boolean
* @returns {string} output string
*
* @example
* var str = 'beep boop Foo bar';
* var out = removeWords( str, [ 'boop', 'foo' ] );
* // returns 'beep Foo bar'
*
* @example
* var str = 'beep boop Foo bar';
* var out = removeWords( str, [ 'boop', 'foo' ], true );
* // returns 'beep bar'
*/
function removeWords( str, words, ignoreCase ) {
var tokens;
var token;
var list;
var flg;
var out;
var N;
var i;
var j;
if ( !isString( str ) ) {
throw new TypeError( format( 'invalid argument. First argument must be a string. Value: `%s`.', str ) );
}
if ( !isStringArray( words ) ) {
throw new TypeError( format( 'invalid argument. Second argument must be an array of strings. Value: `%s`.', words ) );
}
if ( arguments.length > 2 ) {
if ( !isBoolean( ignoreCase ) ) {
throw new TypeError( format( 'invalid argument. Third argument must be a boolean. Value: `%s`.', ignoreCase ) );
}
}
tokens = tokenize( str, true );
N = words.length;
out = [];
if ( ignoreCase ) {
list = words.slice();
for ( i = 0; i < N; i++ ) {
list[ i ] = uppercase( list[ i ] );
}
for ( i = 0; i < tokens.length; i++ ) {
flg = true;
token = uppercase( tokens[ i ] );
for ( j = 0; j < N; j++ ) {
if ( list[ j ] === token ) {
flg = false;
break;
}
}
if ( flg ) {
out.push( tokens[ i ] );
}
}
return out.join( '' );
}
// Case: case-sensitive
for ( i = 0; i < tokens.length; i++ ) {
token = tokens[ i ];
flg = true;
for ( j = 0; j < N; j++ ) {
if ( words[ j ] === token ) {
flg = false;
break;
}
}
if ( flg ) {
out.push( token );
}
}
return out.join( '' );
}
// EXPORTS //
module.exports = removeWords;
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