80 lines
2.4 KiB
JavaScript
80 lines
2.4 KiB
JavaScript
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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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export default function stripJsonComments(jsonString, { whitespace = true } = {}) {
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if (typeof jsonString !== 'string') {
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throw new TypeError(
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`Expected argument \`jsonString\` to be a \`string\`, got \`${typeof jsonString}\``,
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);
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}
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const strip = whitespace ? stripWithWhitespace : stripWithoutWhitespace;
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let isInsideString = false;
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let isInsideComment = false;
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let offset = 0;
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let result = '';
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for (let index = 0; index < jsonString.length; index++) {
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const currentCharacter = jsonString[index];
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const nextCharacter = jsonString[index + 1];
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if (!isInsideComment && currentCharacter === '"') {
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const escaped = isEscaped(jsonString, index);
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if (!escaped) {
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isInsideString = !isInsideString;
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}
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}
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if (isInsideString) {
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continue;
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}
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if (!isInsideComment && currentCharacter + nextCharacter === '//') {
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result += jsonString.slice(offset, index);
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offset = index;
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isInsideComment = singleComment;
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index++;
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} else if (isInsideComment === singleComment && currentCharacter + nextCharacter === '\r\n') {
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index++;
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isInsideComment = false;
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result += strip(jsonString, offset, index);
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offset = index;
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continue;
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} else if (isInsideComment === singleComment && currentCharacter === '\n') {
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isInsideComment = false;
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result += strip(jsonString, offset, index);
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offset = index;
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} else if (!isInsideComment && currentCharacter + nextCharacter === '/*') {
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result += jsonString.slice(offset, index);
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offset = index;
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isInsideComment = multiComment;
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index++;
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continue;
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} else if (isInsideComment === multiComment && currentCharacter + nextCharacter === '*/') {
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index++;
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isInsideComment = false;
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result += strip(jsonString, offset, index + 1);
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offset = index + 1;
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continue;
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}
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}
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return result + (isInsideComment ? strip(jsonString.slice(offset)) : jsonString.slice(offset));
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}
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