// ==UserScript==
// @name         YAML 阅读器 & 编辑器 (分屏实时预览 + 快捷缩进)
// @namespace    http://tampermonkey.net/
// @version      1.0.0
// @description  把 .yaml/.yml 拖到任意网页或空白页即可解析成可折叠树；直接打开本地文件时按地址把字节读回来再解析。编辑器支持 Tab/Shift+Tab 缩进、回车自动续进、选区整行缩进，右侧原文改动实时刷新左侧树。支持多文档(---)、锚点/别名、块标量；可搜索定位、另存为 JSON / 规范化 YAML、Ctrl+S 保存。其它格式一律不拦。
// @author       healer007
// @match        *://*/*
// @match        file:///*
// @include      about:blank
// @grant        GM_addStyle
// @grant        GM_registerMenuCommand
// @grant        GM_xmlhttpRequest
// @grant        unsafeWindow
// @connect      *
// @run-at       document-start
// @noframes
// @license      MIT
// @icon         data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyNCIgaGVpZ2h0PSIyNCIgdmlld0JveD0iMCAwIDI0IDI0Ij48cmVjdCB3aWR0aD0iMjQiIGhlaWdodD0iMjQiIHJ4PSI1IiBmaWxsPSIjMjgyYTM2IiBzdHJva2U9IiM1MGZhN2IiIHN0cm9rZS13aWR0aD0iMS40Ii8+PHRleHQgeD0iMTIiIHk9IjE2LjUiIHRleHQtYW5jaG9yPSJtaWRkbGUiIGZvbnQtZmFtaWx5PSJDb25zb2xhcyxNZW5sbyxtb25vc3BhY2UiIGZvbnQtc2l6ZT0iMTIiIGZvbnQtd2VpZ2h0PSJib2xkIiBmaWxsPSIjNTBmYTdiIj5ZPC90ZXh0Pjwvc3ZnPg==
// ==/UserScript==

/*
 * 用法
 *   1. 浏览器直接打开本地 .yaml / .yml → 自动解析成分屏界面（左侧树形预览，右侧原文编辑）。
 *   2. 编辑右侧原文，左侧实时刷新（解析失败会显示行/列和错误摘录，并保留原文）。
 *   3. 快捷缩进：
 *      · Tab                光标处插入 2 空格；选中多行时整块加缩进
 *      · Shift+Tab          当前行/选区行整体减一级缩进（2 空格）
 *      · Enter              自动延续上一行缩进；行尾是 key: / - / | / > 时自动加 2 空格
 *      · 工具栏 ⇤ / ⇥       对当前行或选区行减/加缩进
 *   4. 保存：Ctrl+S 或「保存」按原格式导出；「另存为」可导出 .json 或规范化 .yml。
 *
 * 范围边界（和 data-reader / markdown-reader / word-reader 协作）
 *   · 脚本注入所有网页只为接住拖放。拖进来的扩展名不是 .yaml/.yml 时不接管 drop，
 *     浏览器照常打开，其他脚本也能接手。
 *   · dragenter/dragover 对文件拖放一律 preventDefault（只保证 drop 能触发，不吞默认行为），
 *     与 data-reader 1.4.0 同一策略，重复取消无副作用。
 *   · 自动铺满页面只发生在 file:// 且扩展名是 yaml/yml 时；http(s) 上的 yaml 接口页不自动接管。
 *   · 声明接管用 documentElement.dataset.fileReader = 'yaml'，
 *     data-reader 的守护看到非 'data' 会停手，互不抢页面。
 *
 * 与浏览器自带查看器的冲突（Chrome / Edge）
 *   · .yaml/.yml 通常没有内置查看器：要么直接下载，要么空白页。
 *   · 对策与 data-reader 一致：<pre> 有内容先抓快照；为空就按 file:// 地址把字节读回来
 *     （UTF-8 失败再试 gb18030）；用 MutationObserver 在界面被冲掉后挂回去。
 *
 * 解析能力
 *   · 内嵌 js-yaml 4.1.0（MIT）浏览器 bundle，完整 YAML 1.1/1.2 子集：
 *     锚点 & / 别名 *、块标量 | >、flow 风格 {} []、多文档 ---、!!binary 等标签。
 *   · 多文档文件在树里按「文档 N」分节；另存为 JSON 时多文档导出为数组。
 *   · 解析错误带行/列定位 + 出错行摘录（js-yaml YAMLException.mark）。
 *   · 搜索：匹配的键/值高亮并自动展开，无关子树收起变暗。
 *   · YAML 文件普遍在百 KB 量级，不做虚拟列表；超过 64MB 拒绝载入。
 */

(function () {
    'use strict';

    /* ============================================================
     * 0. 常量与状态
     * ============================================================ */

    const VERSION = '1.0.0';

    const ROOT_ID = 'yr-reader-root';
    const EXT_YAML = ['yaml', 'yml'];
    const MAX_AUTO_PARSE = 64 * 1024 * 1024;   // 超过 64MB 拒绝载入
    const PREVIEW_DEBOUNCE = 250;

    const state = {
        fileName: 'data',
        original: '',              // 载入时的原文，用于「还原」和未保存判断
        text: '',                  // 当前原文（= textarea.value）
        docs: null,                // loadAll 结果（数组，可能是多文档）
        error: '',                 // 解析错误信息（含行列）
        errLine: -1,               // 出错行（1-based，-1 未知）
        parseMs: 0,
        query: '',
        fold: {},                  // 树节点折叠状态 path -> 'open' | 'closed'
        debounceTimer: 0
    };

    const refs = {};

    /**
     * 浏览器把 file:// 的 yaml 当下载或空白页处理，没有可靠的原生查看器，
     * 但 JSON 查看器的经验表明它可能重建 body —— 依然先把正文抓到手再说。
     */
    let capturedSource = null;

    function captureSource(force) {
        if (!force && capturedSource !== null) return capturedSource;
        let text = '';
        try {
            const pre = document.querySelector('body > pre') || document.querySelector('pre');
            if (pre) text = pre.textContent || '';
            if (!text && location.protocol === 'file:' && document.body && !document.body.firstElementChild) {
                text = document.body.textContent || '';
            }
        } catch (e) {
            text = '';
        }
        // 空读不写入缓存，否则会把后面的 load / 重新读取挡住
        if (text) capturedSource = text;
        return text || capturedSource || '';
    }

    function killNativeViewer() {
        try {
            document.querySelectorAll('.json-formatter-container').forEach(function (el) { el.remove(); });
        } catch (e) { /* 忽略 */ }
    }

    /* ============================================================
     * 1. 小工具
     * ============================================================ */

    function escapeHtml(s) {
        return String(s == null ? '' : s)
            .replace(/&/g, '&amp;')
            .replace(/</g, '&lt;')
            .replace(/>/g, '&gt;')
            .replace(/"/g, '&quot;')
            .replace(/'/g, '&#39;');
    }

    function extOf(name) {
        const i = String(name || '').lastIndexOf('.');
        return i < 0 ? '' : String(name).slice(i + 1).toLowerCase();
    }

    function baseName(name) {
        return String(name || 'data').replace(/\.[^.]+$/, '') || 'data';
    }

    function fmtSize(n) {
        if (n == null) return '';
        const units = ['B', 'KB', 'MB', 'GB'];
        let i = 0, v = Number(n);
        while (v >= 1024 && i < units.length - 1) { v /= 1024; i++; }
        return (i === 0 ? v : v.toFixed(v < 10 ? 2 : 1)) + ' ' + units[i];
    }

    function downloadBlob(blob, filename) {
        const url = URL.createObjectURL(blob);
        const a = document.createElement('a');
        a.href = url;
        a.download = filename;
        a.style.display = 'none';
        document.body.appendChild(a);
        a.click();
        setTimeout(function () {
            try { a.remove(); } catch (e) { /* 忽略 */ }
            URL.revokeObjectURL(url);
        }, 4000);
    }

    /** UTF-8 严格解码，失败退 gb18030（中文 Windows 导出的文件常见） */
    function decodeText(u8) {
        try {
            return new TextDecoder('utf-8', { fatal: true }).decode(u8);
        } catch (e) {
            try { return new TextDecoder('gb18030').decode(u8); } catch (e2) { return new TextDecoder('utf-8').decode(u8); }
        }
    }

    function stripBom(s) {
        return s.charCodeAt(0) === 0xFEFF ? s.slice(1) : s;
    }

    /* ============================================================
     * 1b. YAML 解析封装（内嵌 js-yaml，见文件末尾的 bundle）
     * ============================================================ */

    const YAML_LIB = (function () {
        const exports = undefined, module = undefined, define = undefined;   // 强制 UMD 走 globalThis 分支
        !function(e,t){"object"==typeof exports&&"undefined"!=typeof module?t(exports):"function"==typeof define&&define.amd?define(["exports"],t):t((e="undefined"!=typeof globalThis?globalThis:e||self).jsyaml={})}(this,function(e){"use strict";function t(e){return e&&e.__esModule&&Object.prototype.hasOwnProperty.call(e,"default")?e.default:e}var n,r,i,o,a,l,u,c,s,p,f,d,h,m,g,y,v,b,A,k,w,x,C,S,I,T,O,j,M,F,E,N,L,_,D,U,q,Y,K,R,H,P,B,W,$={},G={},Z={};function V(){if(n)return Z;function e(t){return(e="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e})(t)}function t(e){return null==e}return n=1,Z.isNothing=t,Z.isObject=function(t){return"object"===e(t)&&null!==t},Z.toArray=function(e){return Array.isArray(e)?e:t(e)?[]:[e]},Z.repeat=function(e,t){for(var n="",r=0;r<t;r+=1)n+=e;return n},Z.isNegativeZero=function(e){return 0===e&&Number.NEGATIVE_INFINITY===1/e},Z.extend=function(e,t){if(t)for(var n=Object.keys(t),r=0,i=n.length;r<i;r+=1){var o=n[r];e[o]=t[o]}return e},Z}function J(){if(i)return r;function e(e,t){var n="",r=e.reason||"(unknown reason)";return e.mark?(e.mark.name&&(n+='in "'+e.mark.name+'" '),n+="("+(e.mark.line+1)+":"+(e.mark.column+1)+")",!t&&e.mark.snippet&&(n+="\n\n"+e.mark.snippet),r+" "+n):r}function t(t,n){Error.call(this),this.name="YAMLException",this.reason=t,this.mark=n,this.message=e(this,!1),Error.captureStackTrace?Error.captureStackTrace(this,this.constructor):this.stack=(new Error).stack||""}return i=1,t.prototype=Object.create(Error.prototype),t.prototype.constructor=t,t.prototype.toString=function(t){return this.name+": "+e(this,t)},r=t}function z(){if(u)return l;u=1;var e=J(),t=["kind","multi","resolve","construct","instanceOf","predicate","represent","representName","defaultStyle","styleAliases"],n=["scalar","sequence","mapping"];return l=function(r,i){var o,a;if(i=i||{},Object.keys(i).forEach(function(n){if(-1===t.indexOf(n))throw new e('Unknown option "'+n+'" is met in definition of "'+r+'" YAML type.')}),this.options=i,this.tag=r,this.kind=i.kind||null,this.resolve=i.resolve||function(){return!0},this.construct=i.construct||function(e){return e},this.instanceOf=i.instanceOf||null,this.predicate=i.predicate||null,this.represent=i.represent||null,this.representName=i.representName||null,this.defaultStyle=i.defaultStyle||null,this.multi=i.multi||!1,this.styleAliases=(o=i.styleAliases||null,a={},null!==o&&Object.keys(o).forEach(function(e){o[e].forEach(function(t){a[String(t)]=e})}),a),-1===n.indexOf(this.kind))throw new e('Unknown kind "'+this.kind+'" is specified for "'+r+'" YAML type.')}}function Q(){if(s)return c;s=1;var e=J(),t=z();function n(e,t){var n=[];return e[t].forEach(function(e){var t=n.length;n.forEach(function(n,r){n.tag===e.tag&&n.kind===e.kind&&n.multi===e.multi&&(t=r)}),n[t]=e}),n}function r(e){return this.extend(e)}return r.prototype.extend=function(i){var o=[],a=[];if(i instanceof t)a.push(i);else if(Array.isArray(i))a=a.concat(i);else{if(!i||!Array.isArray(i.implicit)&&!Array.isArray(i.explicit))throw new e("Schema.extend argument should be a Type, [ Type ], or a schema definition ({ implicit: [...], explicit: [...] })");i.implicit&&(o=o.concat(i.implicit)),i.explicit&&(a=a.concat(i.explicit))}o.forEach(function(n){if(!(n instanceof t))throw new e("Specified list of YAML types (or a single Type object) contains a non-Type object.");if(n.loadKind&&"scalar"!==n.loadKind)throw new e("There is a non-scalar type in the implicit list of a schema. 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"),s+=e.dump,h&&(s+=d(e,t)),T(e,t+1,f,!0,h)&&(e.dump&&10===e.dump.charCodeAt(0)?s+=":":s+=": ",o+=s+=e.dump)}}e.tag=a,e.dump=o||"{}"}(e,t,e.dump,a),f&&(e.dump="&ref_"+p+e.dump)):(!function(e,t,n){for(var r="",i=e.tag,o=Object.keys(n),a=0,l=o.length;a<l;a+=1){var u="";""!==r&&(u+=", "),e.condenseFlow&&(u+='"');var c=o[a],s=n[c];e.replacer&&(s=e.replacer.call(n,c,s)),T(e,t,c,!1,!1)&&(e.dump.length>1024&&(u+="? "),u+=e.dump+(e.condenseFlow?'"':"")+":"+(e.condenseFlow?"":" "),T(e,t,s,!1,!1)&&(r+=u+=e.dump))}e.tag=i,e.dump="{"+r+"}"}(e,t,e.dump),f&&(e.dump="&ref_"+p+" "+e.dump));else if("[object Array]"===c)o&&0!==e.dump.length?(e.noArrayIndent&&!u&&t>0?S(e,t-1,e.dump,a):S(e,t,e.dump,a),f&&(e.dump="&ref_"+p+e.dump)):(!function(e,t,n){for(var r="",i=e.tag,o=0,a=n.length;o<a;o+=1){var l=n[o];e.replacer&&(l=e.replacer.call(n,String(o),l)),(T(e,t,l,!1,!1)||void 0===l&&T(e,t,null,!1,!1))&&(""!==r&&(r+=","+(e.condenseFlow?"":" ")),r+=e.dump)}e.tag=i,e.dump="["+r+"]"}(e,t,e.dump),f&&(e.dump="&ref_"+p+" "+e.dump));else{if("[object String]"!==c){if("[object Undefined]"===c)return!1;if(e.skipInvalid)return!1;throw new n("unacceptable kind of an object to dump "+c)}"?"!==e.tag&&k(e,e.dump,t,l,s)}if(null!==e.tag&&"?"!==e.tag){var m=encodeURI("!"===e.tag[0]?e.tag.slice(1):e.tag).replace(/!/g,"%21");m="!"===e.tag[0]?"!"+m:"tag:yaml.org,2002:"===m.slice(0,18)?"!!"+m.slice(18):"!<"+m+">",e.dump=m+" "+e.dump}}return!0}function O(e,t){var n=[],r=[];j(e,n,r);for(var i=r.length,o=0;o<i;o+=1)t.duplicates.push(n[r[o]]);t.usedDuplicates=new Array(i)}function j(t,n,r){if(null!==t&&"object"===e(t)){var i=n.indexOf(t);if(-1!==i)-1===r.indexOf(i)&&r.push(i);else if(n.push(t),Array.isArray(t))for(var o=0,a=t.length;o<a;o+=1)j(t[o],n,r);else for(var l=Object.keys(t),u=0,c=l.length;u<c;u+=1)j(t[l[u]],n,r)}}return be.dump=function(e,t){var n=new p(t=t||{});n.noRefs||O(e,n);var r=e;return n.replacer&&(r=n.replacer.call({"":r},"",r)),T(n,0,r,!0,!0)?n.dump+"\n":""},be}var ke=t(function(){if(ve)return $;ve=1;var e=ge(),t=Ae();function n(e,t){return function(){throw new Error("Function yaml."+e+" is removed in js-yaml 4. Use yaml."+t+" instead, which is now safe by default.")}}return $.Type=z(),$.Schema=Q(),$.FAILSAFE_SCHEMA=ne(),$.JSON_SCHEMA=le(),$.CORE_SCHEMA=ue(),$.DEFAULT_SCHEMA=me(),$.load=e.load,$.loadAll=e.loadAll,$.dump=t.dump,$.YAMLException=J(),$.types={binary:pe(),float:ae(),map:te(),null:re(),pairs:de(),set:he(),timestamp:ce(),bool:ie(),int:oe(),merge:se(),omap:fe(),seq:ee(),str:X()},$.safeLoad=n("safeLoad","load"),$.safeLoadAll=n("safeLoadAll","loadAll"),$.safeDump=n("safeDump","dump"),$}()),we=ke.Type,xe=ke.Schema,Ce=ke.FAILSAFE_SCHEMA,Se=ke.JSON_SCHEMA,Ie=ke.CORE_SCHEMA,Te=ke.DEFAULT_SCHEMA,Oe=ke.load,je=ke.loadAll,Me=ke.dump,Fe=ke.YAMLException,Ee=ke.types,Ne=ke.safeLoad,Le=ke.safeLoadAll,_e=ke.safeDump;e.CORE_SCHEMA=Ie,e.DEFAULT_SCHEMA=Te,e.FAILSAFE_SCHEMA=Ce,e.JSON_SCHEMA=Se,e.Schema=xe,e.Type=we,e.YAMLException=Fe,e.default=ke,e.dump=Me,e.load=Oe,e.loadAll=je,e.safeDump=_e,e.safeLoad=Ne,e.safeLoadAll=Le,e.types=Ee,Object.defineProperty(e,"__esModule",{value:!0})});
//# sourceMappingURL=js-yaml.min.js.map

        return (typeof globalThis !== 'undefined' && globalThis.jsyaml)
            || (typeof self !== 'undefined' && self.jsyaml)
            || null;
    })();

    /** 全部文档解析；空文本返回 []；失败抛出带 mark 的 YAMLException */
    function yamlParseAll(text, fileName) {
        const raw = stripBom(String(text == null ? '': text));
        if (!raw.trim()) return [];
        if (!YAML_LIB) throw new Error('内嵌 js-yaml 加载失败');
        return YAML_LIB.loadAll(raw, null, { filename: fileName || 'data' });
    }

    /** 规范化导出：多文档时用 --- 分隔，indent 2、不折行、不展开引用 */
    function yamlDumpAll(docs) {
        if (!YAML_LIB) throw new Error('内嵌 js-yaml 加载失败');
        const opts = { indent: 2, lineWidth: -1, noRefs: true };
        const arr = Array.isArray(docs) ? docs : [docs];
        let out = '';
        for (let i = 0; i < arr.length; i++) {
            if (i > 0) out += '---\n';
            out += YAML_LIB.dump(arr[i] === undefined ? null : arr[i], opts);
        }
        return out;
    }

    /** 从 YAMLException 提取行/列（1-based）与原因 */
    function parseErrorInfo(e) {
        const mark = e && e.mark;
        return {
            line: mark ? mark.line + 1 : -1,
            col: mark ? mark.column + 1 : -1,
            reason: (e && e.reason) || (e && e.message) || String(e),
            message: (e && e.message) || String(e)
        };
    }

    /* ============================================================
     * 2. 树模型 / 搜索匹配
     * ============================================================ */

    /** 节点自身文本（键名或标量值）是否命中搜索词 */
    function nodeSelfMatch(keyLabel, v, q) {
        if (!q) return true;
        if (keyLabel != null && String(keyLabel).toLowerCase().indexOf(q) >= 0) return true;
        if (v === null || typeof v !== 'object') {
            return String(v == null ? '' : v).toLowerCase().indexOf(q) >= 0;
        }
        return false;
    }

    /** 子树内是否存在任何命中（键名或值） */
    function subtreeHasMatch(v, q) {
        if (!q) return true;
        if (v === null || typeof v !== 'object') {
            return String(v == null ? '' : v).toLowerCase().indexOf(q) >= 0;
        }
        if (Array.isArray(v)) {
            for (let i = 0; i < v.length; i++) if (subtreeHasMatch(v[i], q)) return true;
            return false;
        }
        const keys = Object.keys(v);
        for (let i = 0; i < keys.length; i++) {
            if (keys[i].toLowerCase().indexOf(q) >= 0) return true;
            if (subtreeHasMatch(v[keys[i]], q)) return true;
        }
        return false;
    }

    /** 纯文本搜索高亮：按原始文本切段，段内 escape，避免 & 实体错位 */
    function highlight(text, q) {
        const s = String(text == null ? '' : text);
        if (!q) return escapeHtml(s);
        const low = s.toLowerCase();
        const out = [];
        let i = 0;
        while (i < s.length) {
            const hit = low.indexOf(q, i);
            if (hit < 0) { out.push(escapeHtml(s.slice(i))); break; }
            if (hit > i) out.push(escapeHtml(s.slice(i, hit)));
            out.push('<mark>' + escapeHtml(s.slice(hit, hit + q.length)) + '</mark>');
            i = hit + q.length;
        }
        return out.join('');
    }

    /* ============================================================
     * 3. 样式
     * ============================================================ */

    const CSS = [
        'html,body{height:100%;}',
        'body{margin:0;padding:0;overflow:hidden;background:#1e1f29;color:#f8f8f2;',
        'font:13px/1.55 -apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",Helvetica,Arial,sans-serif;}',
        '.yr-root{display:flex;flex-direction:column;height:100vh;width:100vw;}',

        /* 顶部工具条 */
        '.yr-topbar{display:flex;align-items:center;gap:8px;flex-wrap:wrap;padding:6px 12px;flex:0 0 auto;',
        'position:relative;background:#282a36;border-bottom:1px solid #44475a;}',
        '.yr-badge{display:inline-flex;align-items:center;justify-content:center;height:21px;padding:0 7px;border-radius:5px;',
        'font-size:10.5px;font-weight:700;letter-spacing:.5px;background:rgba(80,250,123,.14);border:1px solid rgba(80,250,123,.45);color:#50fa7b;}',
        '.yr-name{font-weight:600;font-size:13px;max-width:24vw;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}',
        '.yr-meta{color:#6272a4;font-size:12px;white-space:nowrap;}',
        '.yr-dirty{color:#f1fa8c;font-size:12px;white-space:nowrap;}',
        '.yr-grow{flex:1 1 auto;}',
        '.yr-btn{appearance:none;border:1px solid #44475a;background:#313244;color:#f8f8f2;border-radius:6px;',
        'padding:4px 10px;font-size:12px;line-height:1.5;cursor:pointer;white-space:nowrap;transition:.14s;}',
        '.yr-btn:hover{border-color:#50fa7b;color:#50fa7b;}',
        '.yr-btn:active{transform:translateY(1px);}',
        '.yr-btn.primary{background:rgba(80,250,123,.16);border-color:rgba(80,250,123,.55);color:#50fa7b;font-weight:600;}',
        '.yr-sel{appearance:none;background:#313244;color:#f8f8f2;border:1px solid #44475a;border-radius:6px;',
        'padding:4px 6px;font-size:12px;cursor:pointer;}',
        '.yr-search{background:#313244;border:1px solid #44475a;border-radius:6px;color:#f8f8f2;',
        'padding:4px 9px;font-size:12px;width:180px;outline:none;}',
        '.yr-search:focus{border-color:#50fa7b;}',
        '.yr-search::placeholder{color:#6272a4;}',

        /* 分屏 */
        '.yr-split{flex:1 1 auto;display:flex;min-height:0;}',
        '.yr-pane{overflow:auto;box-sizing:border-box;height:100%;}',
        '.yr-pane-left{flex:1 1 0;min-width:0;background:#21222c;}',
        '.yr-pane-right{flex:1 1 0;min-width:0;background:#282a36;border-left:0;}',
        '.yr-editor{width:100%;height:100%;background:transparent;color:#f8f8f2;border:none;resize:none;outline:none;padding:12px 14px;',
        'box-sizing:border-box;white-space:pre;overflow-wrap:normal;tab-size:2;',
        'font:12.5px/1.6 "SFMono-Regular",Consolas,"Liberation Mono",Menlo,monospace;}',
        '.yr-splitter{flex:0 0 6px;background:#44475a;cursor:col-resize;position:relative;z-index:5;transition:background .15s;}',
        '.yr-splitter:hover,.yr-splitter.dragging{background:#50fa7b;}',
        '.yr-splitter::after{content:"⋮";position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);color:#888;font-size:16px;line-height:1;}',

        /* 树视图 */
        '.yr-treewrap{padding:12px 14px;font-family:"SFMono-Regular",Consolas,Menlo,monospace;font-size:12.5px;line-height:1.7;}',
        '.yr-doclabel{display:block;color:#8be9fd;font-weight:600;border-bottom:1px dashed #44475a;margin:10px 0 4px;padding-bottom:2px;}',
        '.yr-doclabel:first-child{margin-top:0;}',
        '.yr-tree details{margin-left:14px;border-left:1px dotted #44475a;padding-left:10px;}',
        '.yr-tree summary{cursor:pointer;list-style:none;outline:none;white-space:pre-wrap;word-break:break-all;}',
        '.yr-tree summary::-webkit-details-marker{display:none;}',
        '.yr-tree summary::before{content:"▸";display:inline-block;width:12px;color:#6272a4;transition:transform .12s;}',
        '.yr-tree details[open]>summary::before{transform:rotate(90deg);}',
        '.yr-line{white-space:pre-wrap;word-break:break-all;}',
        '.yr-k{color:#bd93f9;}',
        '.yr-s{color:#50fa7b;}',
        '.yr-n{color:#ffb86c;}',
        '.yr-b{color:#ff79c6;}',
        '.yr-null{color:#6272a4;font-style:italic;}',
        '.yr-cnt{color:#6272a4;font-size:11px;margin-left:6px;}',
        '.yr-dim{opacity:.32;}',
        '.yr-tree mark{background:rgba(241,250,140,.35);color:#f1fa8c;border-radius:2px;padding:0 1px;}',

        /* 底栏 */
        '.yr-foot{flex:0 0 auto;display:flex;align-items:center;gap:9px;flex-wrap:wrap;padding:5px 12px;',
        'background:#282a36;border-top:1px solid #44475a;color:#6272a4;font-size:12px;}',
        '.yr-foot b{color:#f8f8f2;font-weight:600;}',

        /* 空态 / 错误 */
        '.yr-empty{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;gap:9px;',
        'color:#6272a4;text-align:center;padding:40px;}',
        '.yr-empty .yr-big{font-size:40px;line-height:1;}',
        '.yr-err{margin:14px;padding:12px 14px;border-radius:9px;background:rgba(255,85,85,.1);',
        'border:1px solid rgba(255,85,85,.45);color:#ffb3b3;font-size:12.5px;}',
        '.yr-err b{display:block;margin-bottom:6px;color:#ff6b6b;font-size:13px;}',
        '.yr-err pre{margin:8px 0 0;padding:8px 10px;background:rgba(0,0,0,.3);border-radius:6px;overflow:auto;',
        'font:12px/1.6 Consolas,Menlo,monospace;color:#cfd3e0;}',
        '.yr-err pre .yr-errline{color:#ff8f8f;font-weight:600;}',

        /* 拖放遮罩 */
        '#yr-drop-overlay{position:fixed;top:0;left:0;right:0;bottom:0;z-index:2147483646;display:flex;align-items:center;',
        'justify-content:center;background:rgba(40,42,54,.95);opacity:0;pointer-events:none;transition:opacity .2s;}',
        '#yr-drop-overlay.show{opacity:1;pointer-events:auto;}',
        '#yr-drop-overlay .yr-box{text-align:center;border:3px dashed #50fa7b;padding:52px 74px;border-radius:22px;background:rgba(30,31,41,.8);}',
        '#yr-drop-overlay .yr-ico{font-size:64px;margin-bottom:16px;}',
        '#yr-drop-overlay .yr-tx{font-size:24px;font-weight:600;margin-bottom:8px;}',
        '#yr-drop-overlay .yr-hi{font-size:14px;color:#6272a4;}',

        /* 滚动条 */
        '.yr-pane::-webkit-scrollbar{width:10px;height:10px;}',
        '.yr-pane::-webkit-scrollbar-track{background:#1e1f29;}',
        '.yr-pane::-webkit-scrollbar-thumb{background:#44475a;border-radius:5px;border:2px solid #1e1f29;}',
        '.yr-pane::-webkit-scrollbar-thumb:hover{background:#6272a4;}',

        '#yr-drop-overlay,#yr-drop-overlay *{box-sizing:border-box;}'
    ].join('\n');

    let stylesInjected = false;
    function injectStyles() {
        if (stylesInjected) return;
        stylesInjected = true;
        try {
            if (typeof GM_addStyle === 'function') { GM_addStyle(CSS); return; }
        } catch (e) { /* 走兜底 */ }
        const st = document.createElement('style');
        st.textContent = CSS;
        (document.head || document.documentElement).appendChild(st);
    }

    /** 声明当前页面归本脚本。data-reader / markdown-reader 的守护看到非自家标记会停手。 */
    function claimReader() {
        try { document.documentElement.dataset.fileReader = 'yaml'; } catch (e) { /* 忽略 */ }
    }

    function readerStillOurs() {
        try { return document.documentElement.dataset.fileReader === 'yaml'; } catch (e) { return false; }
    }

    /* ============================================================
     * 4. 界面
     * ============================================================ */

    function buildUi() {
        const existing = document.getElementById(ROOT_ID);
        if (existing && existing.parentNode === document.body) return;
        if (existing) existing.remove();

        // 先抓原文再动 DOM（同 data-reader 的教训：先清空就读不到 <pre> 了）
        if (autoTarget()) captureSource();
        claimReader();

        injectStyles();

        document.body.innerHTML = '';
        document.documentElement.style.height = '100%';

        const root = document.createElement('div');
        root.className = 'yr-root';
        root.id = ROOT_ID;

        // ---- 顶部工具条 ----
        const top = document.createElement('div');
        top.className = 'yr-topbar';
        top.innerHTML = [
            '<span class="yr-badge" data-ref="badge">YAML</span>',
            '<span class="yr-name" data-ref="name">data</span>',
            '<span class="yr-meta" data-ref="meta"></span>',
            '<span class="yr-dirty" data-ref="dirty"></span>',
            '<span class="yr-grow"></span>',
            '<input class="yr-search" data-ref="search" type="search" placeholder="搜索键 / 值…">',
            '<button class="yr-btn" data-act="pick" title="选择 .yaml / .yml 文件">📂 打开</button>',
            '<button class="yr-btn" data-act="outdent" title="当前行/选区行减一级缩进（Shift+Tab）">⇤</button>',
            '<button class="yr-btn" data-act="indent" title="当前行/选区行加一级缩进（Tab）">⇥</button>',
            '<button class="yr-btn" data-act="revert" title="丢弃修改，回到载入时的内容">还原</button>',
            '<button class="yr-btn" data-act="reparse" title="强制重新解析（也可按 Ctrl+Enter）">重新解析</button>',
            '<select class="yr-sel" data-ref="savefmt" title="保存时使用的格式">',
            '  <option value="origin">保存（原格式）</option>',
            '  <option value="json">另存为 .json</option>',
            '  <option value="yml">规范化 .yml</option>',
            '</select>',
            '<button class="yr-btn primary" data-act="save" title="导出文件（Ctrl+S）">保存</button>'
        ].join('');

        // ---- 分屏 ----
        const split = document.createElement('div');
        split.className = 'yr-split';

        const left = document.createElement('div');
        left.className = 'yr-pane yr-pane-left';
        left.setAttribute('data-ref', 'left');

        const splitter = document.createElement('div');
        splitter.className = 'yr-splitter';

        const right = document.createElement('div');
        right.className = 'yr-pane yr-pane-right';
        const editor = document.createElement('textarea');
        editor.className = 'yr-editor';
        editor.spellcheck = false;
        editor.setAttribute('data-ref', 'editor');
        editor.setAttribute('wrap', 'off');
        editor.placeholder = '在此粘贴 / 编辑 YAML，左侧实时预览…';
        right.appendChild(editor);

        split.appendChild(left);
        split.appendChild(splitter);
        split.appendChild(right);

        // ---- 底栏 ----
        const foot = document.createElement('div');
        foot.className = 'yr-foot';
        foot.setAttribute('data-ref', 'foot');

        root.appendChild(top);
        root.appendChild(split);
        root.appendChild(foot);
        document.body.appendChild(root);

        // ---- 拖放遮罩 ----
        const overlay = document.createElement('div');
        overlay.id = 'yr-drop-overlay';
        overlay.innerHTML = [
            '<div class="yr-box">',
            '  <div class="yr-ico">Y</div>',
            '  <div class="yr-tx">将 YAML 文件拖放到此处</div>',
            '  <div class="yr-hi">支持 .yaml .yml（多文档 / 锚点别名均可）</div>',
            '</div>'
        ].join('');
        document.body.appendChild(overlay);

        root.querySelectorAll('[data-ref]').forEach(function (el) {
            refs[el.getAttribute('data-ref')] = el;
        });
        refs.root = root;
        refs.top = top;
        refs.left = left;
        refs.right = right;
        refs.editor = editor;
        refs.splitter = splitter;
        refs.foot = foot;
        refs.overlay = overlay;

        bindUiEl();
        bindUi();
    }

    /* ============================================================
     * 5. 渲染
     * ============================================================ */

    function scalarHtml(v, q) {
        if (v === null || v === undefined) return '<span class="yr-null">null</span>';
        if (typeof v === 'boolean') return '<span class="yr-b">' + highlight(v ? 'true' : 'false', q) + '</span>';
        if (typeof v === 'number') return '<span class="yr-n">' + highlight(String(v), q) + '</span>';
        const s = String(v);
        if (s.indexOf('\n') >= 0) {
            const first = s.split('\n')[0];
            return '<span class="yr-s" title="' + escapeHtml(s) + '">' + highlight(first, q) +
                '<span class="yr-cnt">⏎ ' + (s.split('\n').length) + ' 行</span></span>';
        }
        return '<span class="yr-s">' + highlight(s, q) + '</span>';
    }

    /**
     * 递归渲染一个节点。
     * keyLabel：键名或数组下标 [0]；path：折叠状态路径（\u0001 分隔）。
     * 搜索时：自身命中 → 高亮；子树有命中 → 展开；都无 → 收起变暗。
     */
    function renderNode(keyLabel, v, path, depth, q) {
        const selfMatch = nodeSelfMatch(keyLabel, v, q);
        const childMatch = q && v !== null && typeof v === 'object' ? subtreeHasMatch(v, q) : false;
        const dim = q && !selfMatch && !childMatch;

        const keyHtml = keyLabel != null
            ? '<span class="yr-k">' + highlight(keyLabel, q) + '</span>' + (typeof v === 'object' && v !== null ? '' : ': ')
            : '';

        if (v === null || typeof v !== 'object') {
            return '<div class="yr-line' + (dim ? ' yr-dim' : '') + '">' + keyHtml + scalarHtml(v, q) + '</div>';
        }

        const isArray = Array.isArray(v);
        const keys = isArray ? v.map(function (x, i) { return i; }) : Object.keys(v);
        const countHtml = '<span class="yr-cnt">' + (isArray ? keys.length + ' 项' : keys.length + ' 键') + '</span>';

        let open;
        if (q) open = childMatch || selfMatch;              // 搜索：有命中的展开
        else if (state.fold[path] === 'closed') open = false;
        else if (state.fold[path] === 'open') open = true;
        else open = depth < 2;                              // 默认展开前两层

        let children = '';
        for (let i = 0; i < keys.length; i++) {
            const k = keys[i];
            const label = isArray ? '[' + k + ']' : String(k);
            children += renderNode(label, v[k], path + '\u0001' + k, depth + 1, q);
        }

        return '<details class="' + (dim ? 'yr-dim' : '') + '"' + (open ? ' open' : '') +
            ' data-path="' + escapeHtml(path) + '">' +
            '<summary>' + keyHtml + countHtml + '</summary>' + children + '</details>';
    }

    function renderTree() {
        const left = refs.left;

        if (state.error) {
            left.innerHTML = buildErrorHtml();
            return;
        }

        if (!state.docs) {
            left.innerHTML = [
                '<div class="yr-empty">',
                '  <div class="yr-big">Y</div>',
                '  <div>拖入 .yaml / .yml 文件，或在右侧直接粘贴内容</div>',
                '</div>'
            ].join('');
            return;
        }

        if (!state.docs.length) {
            left.innerHTML = [
                '<div class="yr-empty">',
                '  <div class="yr-big">∅</div>',
                '  <div>这是一个空 YAML（没有文档内容）</div>',
                '</div>'
            ].join('');
            return;
        }

        const q = state.query.trim().toLowerCase();
        let html = '<div class="yr-treewrap yr-tree">';
        for (let d = 0; d < state.docs.length; d++) {
            if (state.docs.length > 1) html += '<span class="yr-doclabel">📄 文档 ' + (d + 1) + '</span>';
            html += renderNode(null, state.docs[d], String(d), 0, q);
        }
        html += '</div>';
        left.innerHTML = html;
    }

    /** 错误面板：行列定位 + 出错行摘录（前后各一行） */
    function buildErrorHtml() {
        const lines = String(state.text || '').split('\n');
        let snippet = '';
        if (state.errLine > 0) {
            const from = Math.max(0, state.errLine - 2);
            const to = Math.min(lines.length, state.errLine + 1);
            for (let i = from; i < to; i++) {
                const mark = (i + 1) === state.errLine;
                snippet += (i + 1) + ' | ' + (mark ? '<span class="yr-errline">' + escapeHtml(lines[i]) + '</span>' : escapeHtml(lines[i])) + '\n';
            }
        }
        return [
            '<div class="yr-err"><b>解析失败</b>',
            escapeHtml(state.error),
            snippet ? '<pre>' + snippet + '</pre>' : '',
            '<div style="margin-top:8px;color:#6272a4">左侧预览已暂停，右侧原文可继续编辑；改好后点「重新解析」。</div>',
            '</div>'
        ].join('');
    }

    function renderHead() {
        const docs = state.docs;
        refs.name.textContent = state.fileName;
        refs.dirty.textContent = state.text === state.original ? '' : '● 未保存';

        if (state.error) {
            refs.meta.textContent = state.text.length.toLocaleString('en-US') + ' 字符 · 解析失败';
        } else if (!docs) {
            refs.meta.textContent = '';
        } else {
            const docN = docs.length;
            const topKeys = docN === 1 && docs[0] !== null && typeof docs[0] === 'object' && !Array.isArray(docs[0])
                ? Object.keys(docs[0]).length : null;
            refs.meta.textContent = fmtSize(state.text.length) + ' · ' +
                (docN === 1 ? '1 个文档' : docN + ' 个文档') +
                (topKeys != null ? ' · 顶层 ' + topKeys + ' 键' : '') +
                (state.parseMs ? ' · ' + state.parseMs.toFixed(1) + ' ms' : '');
        }
    }

    function renderFoot() {
        const docs = state.docs;
        if (state.error || !docs || !docs.length) { refs.foot.innerHTML = ''; return; }
        refs.foot.innerHTML = [
            '<span>树节点实时预览 · <b>' + state.text.split('\n').length.toLocaleString('en-US') + '</b> 行原文</span>',
            '<span class="yr-grow"></span>',
            '<span class="yr-meta">Tab / Shift+Tab 缩进 · Enter 自动续进 · Ctrl+S 保存</span>'
        ].join('');
    }

    function renderAll() {
        renderHead();
        renderTree();
        renderFoot();
    }

    /* ============================================================
     * 6. 解析调度 / 加载 / 保存
     * ============================================================ */

    function reparse() {
        const text = refs.editor ? refs.editor.value : state.text;
        state.text = text;
        const t0 = performance.now();
        try {
            state.docs = yamlParseAll(text, state.fileName);
            state.error = '';
            state.errLine = -1;
        } catch (e) {
            const info = parseErrorInfo(e);
            state.docs = null;
            state.errLine = info.line;
            state.error = (info.line > 0 ? '第 ' + info.line + ' 行 第 ' + info.col + ' 列 · ' : '') + info.reason;
        }
        state.parseMs = performance.now() - t0;
        renderAll();
    }

    function scheduleReparse() {
        clearTimeout(state.debounceTimer);
        state.debounceTimer = setTimeout(function () { reparse(); }, PREVIEW_DEBOUNCE);
    }

    function loadText(text, fileName) {
        if (!refs.editor) ensureUi();
        state.fileName = fileName || 'data';
        state.original = stripBom(String(text == null ? '' : text));
        state.text = state.original;
        state.query = '';
        state.fold = {};
        state.error = '';
        state.errLine = -1;
        state.parseMs = 0;

        showOverlay(false);

        const ta = refs.editor;
        const pos = { top: ta.scrollTop, left: ta.scrollLeft };
        ta.value = state.original;
        ta.scrollTop = pos.top;
        ta.scrollLeft = pos.left;
        if (refs.search) refs.search.value = '';
        reparse();
    }

    async function loadFile(file) {
        if (!file) return;
        const ext = extOf(file.name);
        if (EXT_YAML.indexOf(ext) < 0) {
            alert('只支持 .yaml / .yml 文件！');
            return;
        }
        if (file.size > MAX_AUTO_PARSE) {
            alert('文件超过 64 MB，暂不支持载入。请拆分文件。');
            return;
        }
        if (state.text !== state.original && !confirm('当前内容有未保存的修改，确定丢弃并打开 ' + file.name + ' 吗？')) return;
        ensureUi();
        try {
            const buf = await file.arrayBuffer();
            loadText(decodeText(new Uint8Array(buf)), file.name);
        } catch (e) {
            alert('读取文件失败：' + (e && e.message ? e.message : e));
        }
    }

    function pickFiles() {
        const input = document.createElement('input');
        input.type = 'file';
        input.accept = '.yaml,.yml';
        input.style.display = 'none';
        input.addEventListener('change', function () {
            const f = input.files && input.files[0];
            try { input.remove(); } catch (e) { /* 忽略 */ }
            if (f) loadFile(f);
        });
        document.body.appendChild(input);
        input.click();
    }

    /** 按目标格式拿到最终要写出的文本；解析失败时原样写原文，绝不吞内容 */
    function buildOutput(fmt) {
        const target = fmt || 'origin';
        if (target === 'json') {
            if (state.docs && state.docs.length) {
                const value = state.docs.length === 1 ? state.docs[0] : state.docs;
                return { text: JSON.stringify(value, null, 2) + '\n', ext: 'json' };
            }
            return { text: state.text, ext: 'yaml' };
        }
        if (target === 'yml') {
            if (state.docs && state.docs.length) {
                return { text: yamlDumpAll(state.docs), ext: 'yaml' };
            }
            return { text: state.text, ext: 'yaml' };
        }
        return { text: state.text, ext: 'yaml' };
    }

    function save(fmt) {
        const out = buildOutput(fmt);
        if (!out.text) return;
        const name = baseName(state.fileName) + '.' + out.ext;
        const mime = out.ext === 'json' ? 'application/json;charset=utf-8' : 'application/yaml;charset=utf-8';
        downloadBlob(new Blob([out.text], { type: mime }), name);

        // 只有「按原格式保存」才认为已保存
        if (!fmt || fmt === 'origin') {
            state.original = out.text;
            state.text = out.text;
            if (refs.editor) refs.editor.value = out.text;
            renderHead();
        }
    }

    /* ============================================================
     * 6b. 编辑器快捷缩进
     * ============================================================ */

    function afterEdit(ta) {
        state.text = ta.value;
        if (!refs.editor) return;      // 无界面（控制台 / 自动化驱动）时只更新状态不渲染
        renderHead();
        scheduleReparse();
    }

    /** 光标处插入文本并收起选区 */
    function insertAtCursor(ta, str) {
        const s = ta.selectionStart, e = ta.selectionEnd;
        ta.value = ta.value.slice(0, s) + str + ta.value.slice(e);
        ta.selectionStart = ta.selectionEnd = s + str.length;
    }

    /**
     * 选区覆盖的行（无选区 = 当前行）整体加/减一级缩进（2 空格）。
     * 空行不动；减缩进最多去掉行首 2 空格。
     */
    function indentSelection(ta, delta) {
        const v = ta.value;
        const s = ta.selectionStart, e = ta.selectionEnd;
        const lineStart = v.lastIndexOf('\n', s - 1) + 1;
        let lineEnd = v.indexOf('\n', e);
        if (lineEnd < 0) lineEnd = v.length;

        const lines = v.slice(lineStart, lineEnd).split('\n');
        for (let i = 0; i < lines.length; i++) {
            if (!lines[i].trim()) continue;
            if (delta > 0) lines[i] = '  ' + lines[i];
            else lines[i] = lines[i].replace(/^ {1,2}/, '');
        }
        const out = lines.join('\n');
        ta.value = v.slice(0, lineStart) + out + v.slice(lineEnd);
        ta.selectionStart = lineStart;
        ta.selectionEnd = lineStart + out.length;
        afterEdit(ta);
    }

    /**
     * 回车自动续进：
     *   · 继承当前行缩进
     *   · 行尾是 key: / - / | / > 时额外 +2 空格（进入子级 / 块标量正文）
     *   · 当前行只有 "- " 时也 +2（列表项内容对齐）
     */
    function enterAutoIndent(ta) {
        const v = ta.value;
        const s = ta.selectionStart, e = ta.selectionEnd;
        const lineStart = v.lastIndexOf('\n', s - 1) + 1;
        const line = v.slice(lineStart, s);
        const indent = (line.match(/^[ \t]*/) || [''])[0];
        // 先剥掉行尾空白再判断（Tab 插入的空格 / 手敲空格都不能影响判定）
        const trimmed = line.replace(/\s+$/, '');
        const extra = /[:\-|>]$/.test(trimmed) ? '  ' : '';
        const ins = '\n' + indent + extra;
        ta.value = v.slice(0, s) + ins + v.slice(e);
        ta.selectionStart = ta.selectionEnd = s + ins.length;
        afterEdit(ta);
    }

    /* ============================================================
     * 7. 事件
     * ============================================================ */

    function onAction(act) {
        switch (act) {
            case 'save': save(undefined); break;
            case 'reparse': reparse(); break;
            case 'revert':
                if (state.text !== state.original && !confirm('确定丢弃所有修改，回到载入时的内容吗？')) return;
                if (refs.editor) refs.editor.value = state.original;
                reparse();
                break;
            case 'indent': if (refs.editor) indentSelection(refs.editor, 1); break;
            case 'outdent': if (refs.editor) indentSelection(refs.editor, -1); break;
            case 'pick': pickFiles(); break;
            default: break;
        }
    }

    function bindUi() {
        // document/window 级监听只挂一次（remount 后不重复）
        if (bindUi._done) return;
        bindUi._done = true;

        // 顶部按钮统一委托
        document.addEventListener('click', function (e) {
            const el = e.target && e.target.closest ? e.target.closest('[data-act]') : null;
            if (!el) return;
            const act = el.dataset.act;
            if (act === 'save' || act === 'reparse' || act === 'revert' || act === 'indent' || act === 'outdent' || act === 'pick') {
                e.preventDefault();
                onAction(act);
            }
        });

        // 树折叠状态：details 的 toggle 不冒泡，用捕获监听接住
        document.addEventListener('toggle', function (e) {
            const t = e.target;
            if (!t || !t.dataset || t.dataset.path === undefined) return;
            state.fold[t.dataset.path] = t.open ? 'open' : 'closed';
        }, true);

        // 点击面板外什么都不做（没有浮动面板），占位保持结构对称

        // 未保存离开提醒
        window.addEventListener('beforeunload', function (e) {
            if (state.text === state.original) return;
            e.preventDefault();
            e.returnValue = '';
            return '';
        });
    }

    /** 元素级绑定，随 buildUi 重挂（remount 后节点是新的） */
    function bindUiEl() {
        // 搜索（作用于左侧树）
        let searchTimer = 0;
        refs.search.addEventListener('input', function () {
            const v = this.value;
            clearTimeout(searchTimer);
            searchTimer = setTimeout(function () {
                state.query = v;
                renderTree();
                renderHead();
            }, 120);
        });

        // 保存格式选择
        refs.top.querySelector('[data-ref="savefmt"]').addEventListener('change', function () {
            save(this.value === 'origin' ? undefined : this.value);
            this.value = 'origin';
        });

        // 编辑区
        refs.editor.addEventListener('input', function () {
            state.text = this.value;
            renderHead();
            scheduleReparse();
        });

        refs.editor.addEventListener('keydown', function (e) {
            const ta = e.target;
            // Tab：插入 2 空格；多行选区整块缩进；Shift+Tab 减缩进
            if (e.key === 'Tab' && !e.ctrlKey && !e.metaKey && !e.altKey) {
                e.preventDefault();
                const multiLine = ta.selectionStart !== ta.selectionEnd &&
                    ta.value.slice(ta.selectionStart, ta.selectionEnd).indexOf('\n') >= 0;
                if (e.shiftKey) indentSelection(ta, -1);
                else if (multiLine) indentSelection(ta, 1);
                else insertAtCursor(ta, '  ');
                return;
            }
            // Enter：自动续进
            if (e.key === 'Enter' && !e.ctrlKey && !e.metaKey && !e.altKey) {
                e.preventDefault();
                enterAutoIndent(ta);
                return;
            }
            // Ctrl+S 保存 / Ctrl+Enter 强制重新解析
            if ((e.ctrlKey || e.metaKey) && (e.key === 's' || e.key === 'S')) {
                e.preventDefault();
                save(undefined);
                return;
            }
            if ((e.ctrlKey || e.metaKey) && e.key === 'Enter') {
                e.preventDefault();
                clearTimeout(state.debounceTimer);
                reparse();
            }
        });

        // 分割条拖动
        let dragging = false, startX = 0, startW = 0;
        refs.splitter.addEventListener('mousedown', function (e) {
            dragging = true;
            startX = e.clientX;
            startW = refs.left.getBoundingClientRect().width;
            refs.splitter.classList.add('dragging');
            document.body.style.cursor = 'col-resize';
            e.preventDefault();
        });
        document.addEventListener('mousemove', function (e) {
            if (!dragging) return;
            const total = refs.root.querySelector('.yr-split').getBoundingClientRect().width;
            const spW = refs.splitter.getBoundingClientRect().width;
            const w = Math.min(Math.max(startW + (e.clientX - startX), total * 0.1), total * 0.9 - spW);
            refs.left.style.flex = '0 0 ' + w + 'px';
            refs.right.style.flex = '0 0 ' + (total - w - spW) + 'px';
        });
        document.addEventListener('mouseup', function () {
            if (!dragging) return;
            dragging = false;
            refs.splitter.classList.remove('dragging');
            document.body.style.cursor = '';
        });
    }

    /* ---------------- 拖放：只接管 .yaml / .yml ---------------- */

    function isFileDrag(e) {
        const dt = e.dataTransfer;
        if (!dt) return false;
        const types = dt.types || [];
        for (let i = 0; i < types.length; i++) if (types[i] === 'Files') return true;
        return false;
    }

    /** 拖动中能不能确认是 YAML 文件。dragover 阶段拿不到文件名，只用于显示遮罩。 */
    function dragHasYamlFile(e) {
        const dt = e.dataTransfer;
        if (!dt) return false;
        const items = dt.items ? Array.prototype.slice.call(dt.items) : [];
        for (let i = 0; i < items.length; i++) {
            if (items[i].kind && items[i].kind !== 'file') continue;
            let f = null;
            try { f = items[i].getAsFile(); } catch (err) { f = null; }
            if (f && f.name) {
                if (EXT_YAML.indexOf(extOf(f.name)) >= 0) return true;
                continue;
            }
            const type = String(items[i].type || '').toLowerCase().split(';')[0].trim();
            if (type === 'text/yaml' || type === 'application/yaml' || type === 'text/x-yaml' ||
                type === 'application/x-yaml') return true;
        }
        return false;
    }

    /** 拖放提示层。不走 buildUi，在别人的页面上拖一下不会把整页清掉。 */
    function ensureOverlay() {
        if (refs.overlay && refs.overlay.parentNode) return refs.overlay;
        if (!document.body) return null;
        injectStyles();
        const overlay = document.createElement('div');
        overlay.id = 'yr-drop-overlay';
        overlay.innerHTML = [
            '<div class="yr-box">',
            '  <div class="yr-ico">Y</div>',
            '  <div class="yr-tx">将 YAML 文件拖放到此处</div>',
            '  <div class="yr-hi">支持 .yaml .yml（多文档 / 锚点别名均可）</div>',
            '</div>'
        ].join('');
        document.body.appendChild(overlay);
        refs.overlay = overlay;
        return overlay;
    }

    function showOverlay(on) {
        if (on) ensureOverlay();
        if (!refs.overlay) return;
        refs.overlay.classList.toggle('show', !!on);
    }

    function bindDrop() {
        // 与 data-reader 1.4.0 同一策略：dragenter/dragover 对所有文件拖放 preventDefault，
        // 保证 drop 能触发且不吞默认行为；drop 阶段按真实文件名决定是否接管。
        document.addEventListener('dragenter', function (e) {
            if (!isFileDrag(e)) return;
            e.preventDefault();
            if (dragHasYamlFile(e)) showOverlay(true);
        }, true);
        document.addEventListener('dragover', function (e) {
            if (!isFileDrag(e)) return;
            e.preventDefault();
            try { e.dataTransfer.dropEffect = 'copy'; } catch (err) { /* 忽略 */ }
        }, true);
        document.addEventListener('dragleave', function (e) {
            if (e.relatedTarget) return;
            showOverlay(false);
        }, true);
        document.addEventListener('drop', function (e) {
            if (!isFileDrag(e)) return;
            showOverlay(false);
            const files = Array.prototype.slice.call((e.dataTransfer && e.dataTransfer.files) || []);
            const hit = files.filter(function (f) { return EXT_YAML.indexOf(extOf(f.name)) >= 0; });
            if (!hit.length) return;                 // 不是 yaml → 不取消默认动作
            e.preventDefault();
            e.stopPropagation();
            loadFile(hit[0]);
        }, true);
    }

    /* ============================================================
     * 8. 启动
     * ============================================================ */

    /** 当前页面是不是「直接打开的本地 yaml 文件」 */
    function autoTarget() {
        if (location.protocol !== 'file:') return '';
        const pathname = decodeURIComponent(location.pathname || '');
        const name = pathname.split('/').pop() || '';
        if (!name || EXT_YAML.indexOf(extOf(name)) < 0) return '';
        return name;
    }

    function registerMenus() {
        if (typeof GM_registerMenuCommand !== 'function') return;
        try {
            GM_registerMenuCommand('📂 打开 YAML 文件…', pickFiles);
            GM_registerMenuCommand('💾 保存当前内容', function () { save(undefined); });
            GM_registerMenuCommand('🔄 重新解析', function () { reparse(); });
        } catch (e) { /* 忽略 */ }
    }

    /** 对外暴露口子，方便控制台 / 自动化驱动（与 data-reader 的 DataReader 同款） */
    function exposeApi() {
        const api = {
            version: VERSION,
            loadText: loadText,
            open: pickFiles,
            save: save,
            reparse: reparse,
            state: state
        };
        try { window.YamlReader = api; } catch (e) { /* 忽略 */ }
        try { (typeof unsafeWindow !== 'undefined' ? unsafeWindow : window).YamlReader = api; } catch (e) { /* 忽略 */ }
    }

    function guardNativeViewer() {
        let scheduled = false;
        let observer = null;
        const check = function () {
            scheduled = false;
            if (!readerStillOurs()) {
                try { if (observer) observer.disconnect(); } catch (e) { /* 忽略 */ }
                return;
            }
            const root = document.getElementById(ROOT_ID);
            if (!root || root.parentNode !== document.body) remount();
            else killNativeViewer();
        };
        const schedule = function () {
            if (scheduled) return;
            scheduled = true;
            const raf = window.requestAnimationFrame || function (fn) { setTimeout(fn, 16); };
            raf(check);
        };
        try {
            observer = new MutationObserver(schedule);
            observer.observe(document.documentElement, { childList: true, subtree: true });
        } catch (e) { /* 忽略 */ }
    }

    /** 界面被冲掉后重建：用已抓在手里的正文快照恢复 */
    function remount() {
        const fileName = state.fileName;
        buildUi();
        killNativeViewer();
        if (state.text) {
            loadText(state.text, fileName);
        } else if (capturedSource && capturedSource.trim() && fileName && fileName !== 'data') {
            loadText(capturedSource, fileName);
        } else {
            renderAll();
            showOverlay(true);
        }
    }

    /** 取不到原文也给出界面（错误面板本身就是指引），绝不留白让人以为脚本没装 */
    function showEmptyState(auto, msg) {
        state.fileName = auto;
        state.error = msg;
        state.text = '';
        state.docs = null;
        refs.editor.value = '';
        renderAll();
    }

    let viewerGuarding = false;
    function ensureUi() {
        if (!document.body) return;
        buildUi();
        if (viewerGuarding) return;
        viewerGuarding = true;
        guardNativeViewer();
    }

    function bufferToText(buf) {
        if (buf == null || buf === '') return '';
        if (typeof buf === 'string') return buf;
        try {
            if (buf instanceof ArrayBuffer) return decodeText(new Uint8Array(buf));
            if (typeof ArrayBuffer !== 'undefined' && ArrayBuffer.isView && ArrayBuffer.isView(buf)) {
                return decodeText(new Uint8Array(buf.buffer, buf.byteOffset, buf.byteLength));
            }
        } catch (e) { /* 忽略 */ }
        return '';
    }

    /** 页面自己的 XHR。油猴沙箱里的 XHR 经常读不到 file://，必须借页面的。 */
    function pageXhr(url, done, binary) {
        const XHR = (typeof unsafeWindow !== 'undefined' && unsafeWindow && unsafeWindow.XMLHttpRequest)
            ? unsafeWindow.XMLHttpRequest
            : XMLHttpRequest;
        let xhr;
        try { xhr = new XHR(); } catch (e) { done(''); return; }
        try { xhr.open('GET', url, true); } catch (e) { done(''); return; }
        if (binary) { try { xhr.responseType = 'arraybuffer'; } catch (e) { /* 退回文本 */ } }
        xhr.onload = function () {
            if (xhr.status && xhr.status !== 200 && xhr.status !== 0) { done(''); return; }
            if (binary) {
                const text = bufferToText(xhr.response);
                if (text && text.trim()) { done(text); return; }
                pageXhr(url, done, false);
                return;
            }
            done(xhr.responseText || '');
        };
        xhr.onerror = function () {
            if (binary) pageXhr(url, done, false);
            else done('');
        };
        try { xhr.send(); } catch (e) {
            if (binary) pageXhr(url, done, false);
            else done('');
        }
    }

    /** 按文件地址把字节读回来（file:// 的 yaml 常常没有 <pre>） */
    function readFileUrl(url, done) {
        let settled = false;
        const finish = function (text) {
            if (settled) return;
            settled = true;
            try { done(text || ''); } catch (e) { /* 忽略 */ }
        };
        pageXhr(url, function (text) {
            if (text && String(text).trim()) { finish(text); return; }
            if (typeof GM_xmlhttpRequest !== 'function') { finish(''); return; }
            try {
                GM_xmlhttpRequest({
                    method: 'GET',
                    url: url,
                    responseType: 'arraybuffer',
                    timeout: 20000,
                    onload: function (res) {
                        const bufText = bufferToText(res && res.response);
                        finish(bufText || (res && res.responseText) || '');
                    },
                    onerror: function () { finish(''); },
                    ontimeout: function () { finish(''); }
                });
            } catch (e) { finish(''); }
        }, true);
    }

    function init() {
        bindDrop();
        registerMenus();
        exposeApi();

        const auto = autoTarget();
        if (!auto) return;

        const bootFromText = function (text) {
            if (!text || !text.trim()) return false;
            capturedSource = text;
            ensureUi();
            if (text.length > MAX_AUTO_PARSE) {
                showEmptyState(auto, '文件超过 64 MB，已跳过自动解析。可以把内容粘贴到右侧再点「重新解析」。');
                showOverlay(true);
                return true;
            }
            loadText(text, auto);
            return true;
        };
        const fail = function () {
            ensureUi();
            showEmptyState(auto, '没能从这个页面读到文件原文（浏览器可能把它当成下载处理了）。'
                + '点「📂 打开」选择文件，或直接把 ' + auto + ' 拖进这个页面。');
        };

        if (bootFromText(captureSource(true))) return;

        readFileUrl(location.href, function (text) {
            if (bootFromText(text) || bootFromText(captureSource(true))) return;
            fail();
        });
    }

    if (document.readyState === 'loading') {
        document.addEventListener('DOMContentLoaded', init, { once: true });
    } else {
        init();
    }
})();