78 lines
2.2 KiB
JavaScript
78 lines
2.2 KiB
JavaScript
'use strict';
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const singleComment = Symbol('singleComment');
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const multiComment = Symbol('multiComment');
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const stripWithoutWhitespace = () => '';
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const stripWithWhitespace = (string, start, end) => string.slice(start, end).replace(/\S/g, ' ');
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const isEscaped = (jsonString, quotePosition) => {
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let index = quotePosition - 1;
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let backslashCount = 0;
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while (jsonString[index] === '\\') {
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index -= 1;
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backslashCount += 1;
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}
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return Boolean(backslashCount % 2);
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};
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module.exports = (jsonString, options = {}) => {
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if (typeof jsonString !== 'string') {
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throw new TypeError(`Expected argument \`jsonString\` to be a \`string\`, got \`${typeof jsonString}\``);
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}
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const strip = options.whitespace === false ? stripWithoutWhitespace : stripWithWhitespace;
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let insideString = false;
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let insideComment = false;
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let offset = 0;
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let result = '';
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for (let i = 0; i < jsonString.length; i++) {
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const currentCharacter = jsonString[i];
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const nextCharacter = jsonString[i + 1];
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if (!insideComment && currentCharacter === '"') {
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const escaped = isEscaped(jsonString, i);
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if (!escaped) {
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insideString = !insideString;
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}
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}
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if (insideString) {
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continue;
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}
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if (!insideComment && currentCharacter + nextCharacter === '//') {
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result += jsonString.slice(offset, i);
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offset = i;
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insideComment = singleComment;
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i++;
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} else if (insideComment === singleComment && currentCharacter + nextCharacter === '\r\n') {
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i++;
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insideComment = false;
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result += strip(jsonString, offset, i);
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offset = i;
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continue;
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} else if (insideComment === singleComment && currentCharacter === '\n') {
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insideComment = false;
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result += strip(jsonString, offset, i);
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offset = i;
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} else if (!insideComment && currentCharacter + nextCharacter === '/*') {
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result += jsonString.slice(offset, i);
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offset = i;
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insideComment = multiComment;
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i++;
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continue;
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} else if (insideComment === multiComment && currentCharacter + nextCharacter === '*/') {
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i++;
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insideComment = false;
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result += strip(jsonString, offset, i + 1);
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offset = i + 1;
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continue;
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}
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}
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return result + (insideComment ? strip(jsonString.slice(offset)) : jsonString.slice(offset));
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};
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