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Dir : ~/usr/share/nodejs/strip-json-comments/

View File Name : index.cjs

const singleComment = Symbol('singleComment');
const multiComment = Symbol('multiComment');

const stripWithoutWhitespace = () => '';

const stripWithWhitespace = (string, start, end) => string.slice(start, end).replace(/\S/g, ' ');

const isEscaped = (jsonString, quotePosition) => {
  let index = quotePosition - 1;
  let backslashCount = 0;

  while (jsonString[index] === '\\') {
    index -= 1;
    backslashCount += 1;
  }

  return Boolean(backslashCount % 2);
};

module.exports = function stripJsonComments(jsonString, {
  whitespace = true
} = {}) {
  if (typeof jsonString !== 'string') {
    throw new TypeError(`Expected argument \`jsonString\` to be a \`string\`, got \`${typeof jsonString}\``);
  }

  const strip = whitespace ? stripWithWhitespace : stripWithoutWhitespace;
  let isInsideString = false;
  let isInsideComment = false;
  let offset = 0;
  let result = '';

  for (let index = 0; index < jsonString.length; index++) {
    const currentCharacter = jsonString[index];
    const nextCharacter = jsonString[index + 1];

    if (!isInsideComment && currentCharacter === '"') {
      const escaped = isEscaped(jsonString, index);

      if (!escaped) {
        isInsideString = !isInsideString;
      }
    }

    if (isInsideString) {
      continue;
    }

    if (!isInsideComment && currentCharacter + nextCharacter === '//') {
      result += jsonString.slice(offset, index);
      offset = index;
      isInsideComment = singleComment;
      index++;
    } else if (isInsideComment === singleComment && currentCharacter + nextCharacter === '\r\n') {
      index++;
      isInsideComment = false;
      result += strip(jsonString, offset, index);
      offset = index;
      continue;
    } else if (isInsideComment === singleComment && currentCharacter === '\n') {
      isInsideComment = false;
      result += strip(jsonString, offset, index);
      offset = index;
    } else if (!isInsideComment && currentCharacter + nextCharacter === '/*') {
      result += jsonString.slice(offset, index);
      offset = index;
      isInsideComment = multiComment;
      index++;
      continue;
    } else if (isInsideComment === multiComment && currentCharacter + nextCharacter === '*/') {
      index++;
      isInsideComment = false;
      result += strip(jsonString, offset, index + 1);
      offset = index + 1;
      continue;
    }
  }

  return result + (isInsideComment ? strip(jsonString.slice(offset)) : jsonString.slice(offset));
}