remove whitespace in JSON

removeWhitespaceInJSON.ts

/**
 * ### 基础空白字符
 * - \s: 匹配所有空白字符包括空格、制表符、换页符等
 * ### Unicode空白字符
 * - \u00A0: 不间断空格 (NO-BREAK SPACE)
 * - \u1680: OGHAM SPACE MARK
 * - \u180E: MONGOLIAN VOWEL SEPARATOR
 * - \u2000-\u200F: 包含了多个空格和方向控制符
 * - \u2028: LINE SEPARATOR
 * - \u2029: PARAGRAPH SEPARATOR
 * - \u202F: NARROW NO-BREAK SPACE
 * - \u205F: MEDIUM MATHEMATICAL SPACE
 * - \u3000: IDEOGRAPHIC SPACE (中日韩全角空格)
 * ### 零宽字符
 * - \uFEFF: ZERO WIDTH NO-BREAK SPACE (BOM)
 * - \u200B: ZERO WIDTH SPACE
 * - \u200C: ZERO WIDTH NON-JOINER
 * - \u200D: ZERO WIDTH JOINER
 * ### 其他
 * - \x00: NULL字符
 * - \u2060: WORD JOINER
 * - \uFFF9-\uFFFB: 交互格式控制字符
 */
const reg = /[\s\x00\u00A0\u1680\u180E\u2000-\u200F\u2028-\u202F\u205F\u2060\u3000\uFEFF\u200B-\u200D\uFFF9-\uFFFB]+/;

/**
 * 移除字符串中非字符串字面量内的空白字符
 * 注: 适用于JSON结构, 不会删除key或value里的空格
 */
export default function removeWhitespaceInJSON(jsonString: string) {
    let result = '';
    let inString = false;
    let escaped = false;

    for (let i = 0; i < jsonString.length; i++) {
        const char = jsonString[i];
        // 遇到未转义的双引号则进入或离开字符串
        if (char === '"' && !escaped) {
            inString = !inString;
            result += char;
        }
        // 不在字符串里时, 过滤空白
        else if (!inString && reg.test(char)) {
            continue;
        } else {
            result += char;
        }
        // 检查是否是转义符
        escaped = !escaped && char === '\\';
    }
    return result;
}