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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);
};
export default 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));
}
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