All files / dsv/base/parse/lib/states skipped_comment.js

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/**
* @license Apache-2.0
*
* Copyright (c) 2022 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.
*/
 
/* eslint-disable no-underscore-dangle */
 
'use strict';
 
// MODULES //
 
var logger = require( 'debug' );
var state2enum = require( './state2enum.js' );
 
 
// VARIABLES //
 
var debug = logger( 'state:skipped_comment' );
 
// Possible transition states...
var INIT = state2enum[ 'init' ];
 
 
// MAIN //
 
/**
* Returns a function for processing a skipped commented line.
*
* @private
* @param {Parser} parser - parser instance
* @returns {Function} processing function
*/
function processor( parser ) {
	var newlineLastIndex;
	var newline;

	newlineLastIndex = parser._newlineLastIndex;
	newline = parser._newline;

	return next;

	/**
	* Processes a character.
	*
	* @private
	* @param {string} ch - character
	* @returns {void}
	*/
	function next( ch ) {
		debug( 'Char: %s', ch );

		// Check for the end of the commented line...
		if (
			ch === newline[ newlineLastIndex ] &&
			parser._scan( newline, newlineLastIndex )
		) {
			// Rewind the cursor to point to the last character before the newline character sequence:
			debug( 'Newline.' );
			parser._rewind( newlineLastIndex )._changeState( INIT );
			return;
		}
		// Continue processing until we can transition to a new state:
		parser._push( ch );
	}
}
 
 
// EXPORTS //
 
module.exports = processor;