1 | 'use strict';
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2 | const singleComment = Symbol('singleComment');
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3 | const multiComment = Symbol('multiComment');
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4 | const stripWithoutWhitespace = () => '';
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5 | const stripWithWhitespace = (string, start, end) => string.slice(start, end).replace(/\S/g, ' ');
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6 |
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7 | const isEscaped = (jsonString, quotePosition) => {
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8 | let index = quotePosition - 1;
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9 | let backslashCount = 0;
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10 |
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11 | while (jsonString[index] === '\\') {
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12 | index -= 1;
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13 | backslashCount += 1;
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14 | }
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15 |
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16 | return Boolean(backslashCount % 2);
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17 | };
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18 |
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19 | module.exports = (jsonString, options = {}) => {
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20 | if (typeof jsonString !== 'string') {
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21 | throw new TypeError(`Expected argument \`jsonString\` to be a \`string\`, got \`${typeof jsonString}\``);
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22 | }
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23 |
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24 | const strip = options.whitespace === false ? stripWithoutWhitespace : stripWithWhitespace;
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25 |
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26 | let insideString = false;
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27 | let insideComment = false;
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28 | let offset = 0;
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29 | let result = '';
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30 |
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31 | for (let i = 0; i < jsonString.length; i++) {
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32 | const currentCharacter = jsonString[i];
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33 | const nextCharacter = jsonString[i + 1];
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34 |
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35 | if (!insideComment && currentCharacter === '"') {
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36 | const escaped = isEscaped(jsonString, i);
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37 | if (!escaped) {
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38 | insideString = !insideString;
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39 | }
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40 | }
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41 |
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42 | if (insideString) {
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43 | continue;
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44 | }
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45 |
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46 | if (!insideComment && currentCharacter + nextCharacter === '//') {
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47 | result += jsonString.slice(offset, i);
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48 | offset = i;
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49 | insideComment = singleComment;
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50 | i++;
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51 | } else if (insideComment === singleComment && currentCharacter + nextCharacter === '\r\n') {
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52 | i++;
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53 | insideComment = false;
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54 | result += strip(jsonString, offset, i);
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55 | offset = i;
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56 | continue;
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57 | } else if (insideComment === singleComment && currentCharacter === '\n') {
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58 | insideComment = false;
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59 | result += strip(jsonString, offset, i);
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60 | offset = i;
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61 | } else if (!insideComment && currentCharacter + nextCharacter === '/*') {
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62 | result += jsonString.slice(offset, i);
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63 | offset = i;
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64 | insideComment = multiComment;
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65 | i++;
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66 | continue;
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67 | } else if (insideComment === multiComment && currentCharacter + nextCharacter === '*/') {
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68 | i++;
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69 | insideComment = false;
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70 | result += strip(jsonString, offset, i + 1);
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71 | offset = i + 1;
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72 | continue;
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73 | }
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74 | }
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75 |
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76 | return result + (insideComment ? strip(jsonString.slice(offset)) : jsonString.slice(offset));
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77 | };
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