1  'use strict';
 2  
 3  const stringReplaceAll = (string, substring, replacer) => {
 4  	let index = string.indexOf(substring);
 5  	if (index === -1) {
 6  		return string;
 7  	}
 8  
 9  	const substringLength = substring.length;
10  	let endIndex = 0;
11  	let returnValue = '';
12  	do {
13  		returnValue += string.substr(endIndex, index - endIndex) + substring + replacer;
14  		endIndex = index + substringLength;
15  		index = string.indexOf(substring, endIndex);
16  	} while (index !== -1);
17  
18  	returnValue += string.substr(endIndex);
19  	return returnValue;
20  };
21  
22  const stringEncaseCRLFWithFirstIndex = (string, prefix, postfix, index) => {
23  	let endIndex = 0;
24  	let returnValue = '';
25  	do {
26  		const gotCR = string[index - 1] === '\r';
27  		returnValue += string.substr(endIndex, (gotCR ? index - 1 : index) - endIndex) + prefix + (gotCR ? '\r\n' : '\n') + postfix;
28  		endIndex = index + 1;
29  		index = string.indexOf('\n', endIndex);
30  	} while (index !== -1);
31  
32  	returnValue += string.substr(endIndex);
33  	return returnValue;
34  };
35  
36  module.exports = {
37  	stringReplaceAll,
38  	stringEncaseCRLFWithFirstIndex
39  };