@stryke/json/dist/utils/strip-comments.mjs

A package containing JSON parsing/stringify utilities used by Storm Software.

import { EMPTY_STRING } from "@stryke/types/base";

//#region src/utils/strip-comments.ts
const singleComment = Symbol("singleComment");
const multiComment = Symbol("multiComment");
function stripWithoutWhitespace() {
	return "";
}
function stripWithWhitespace(value, start, end) {
	return value.slice(start, end).replace(/\S/g, " ");
}
function isEscaped(value, quotePosition) {
	let index = quotePosition - 1;
	let backslashCount = 0;
	while (value[index] === "\\") {
		index -= 1;
		backslashCount += 1;
	}
	return Boolean(backslashCount % 2);
}
function stripComments(value, { whitespace = true, trailingCommas = false } = {}) {
	if (typeof value !== "string") throw new TypeError(`Expected argument \`jsonString\` to be a \`string\`, got \`${typeof value}\``);
	const strip = whitespace ? stripWithWhitespace : stripWithoutWhitespace;
	let isInsideString = false;
	let isInsideComment = false;
	let offset = 0;
	let buffer = "";
	let result = "";
	let commaIndex = -1;
	for (let index = 0; index < value.length; index++) {
		const currentCharacter = value[index];
		const nextCharacter = value[index + 1];
		if (!isInsideComment && currentCharacter === "\"") {
			if (!isEscaped(value, index)) isInsideString = !isInsideString;
		}
		if (isInsideString) continue;
		if (!isInsideComment && currentCharacter + (nextCharacter ?? EMPTY_STRING) === "//") {
			buffer += value.slice(offset, index);
			offset = index;
			isInsideComment = singleComment;
			index++;
		} else if (isInsideComment === singleComment && currentCharacter + (nextCharacter ?? EMPTY_STRING) === "\r\n") {
			index++;
			isInsideComment = false;
			buffer += strip(value, offset, index);
			offset = index;
		} else if (isInsideComment === singleComment && currentCharacter === "\n") {
			isInsideComment = false;
			buffer += strip(value, offset, index);
			offset = index;
		} else if (!isInsideComment && currentCharacter + (nextCharacter ?? EMPTY_STRING) === "/*") {
			buffer += value.slice(offset, index);
			offset = index;
			isInsideComment = multiComment;
			index++;
		} else if (isInsideComment === multiComment && currentCharacter + (nextCharacter ?? EMPTY_STRING) === "*/") {
			index++;
			isInsideComment = false;
			buffer += strip(value, offset, index + 1);
			offset = index + 1;
		} else if (trailingCommas && !isInsideComment) {
			if (commaIndex !== -1) {
				if (currentCharacter === "}" || currentCharacter === "]") {
					buffer += value.slice(offset, index);
					result += strip(buffer, 0, 1) + buffer.slice(1);
					buffer = "";
					offset = index;
					commaIndex = -1;
				} else if (currentCharacter !== " " && currentCharacter !== "	" && currentCharacter !== "\r" && currentCharacter !== "\n") {
					buffer += value.slice(offset, index);
					offset = index;
					commaIndex = -1;
				}
			} else if (currentCharacter === ",") {
				result += buffer + value.slice(offset, index);
				buffer = "";
				offset = index;
				commaIndex = index;
			}
		}
	}
	return result + buffer + (isInsideComment ? strip(value.slice(offset)) : value.slice(offset));
}

//#endregion
export { stripComments };
//# sourceMappingURL=strip-comments.mjs.map