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| /** | |
| * 定根：Chrome 纯文本查看器（body 下仅一个 <pre>）直接用 body； | |
| * 其余走 Readability（预打标 → clone 上跑算法 → data-il-rid 映回）。 | |
| * Readability 失败抛错，不回退启发式。 | |
| */ | |
| (() => { | |
| const ATTR = 'data-il-rid'; | |
| /** 扩展注入的宿主，不算页面内容子节点 */ | |
| function isExtensionHost(el) { | |
| const id = el.id; | |
| return id === 'il-find-root' || id === 'il-overlay-host'; | |
| } | |
| /** | |
| * Chrome/WebKit 对 text/plain 等的包装：<body><pre>…</pre></body> | |
| * @param {Document} doc | |
| * @returns {Element | null} | |
| */ | |
| function findPlainTextRoot(doc) { | |
| const body = doc.body; | |
| if (!body) return null; | |
| const kids = []; | |
| for (const el of body.children) { | |
| if (!isExtensionHost(el)) kids.push(el); | |
| } | |
| if (kids.length === 1 && kids[0].tagName === 'PRE') return body; | |
| return null; | |
| } | |
| function mark(doc) { | |
| if (!doc.body) return; | |
| let seq = 0; | |
| for (const el of doc.body.querySelectorAll('*')) { | |
| el.setAttribute(ATTR, String(++seq)); | |
| } | |
| } | |
| function unmark(doc) { | |
| if (!doc.body) return; | |
| for (const el of doc.body.querySelectorAll(`[${ATTR}]`)) { | |
| el.removeAttribute(ATTR); | |
| } | |
| } | |
| /** | |
| * @param {Document} doc | |
| * @returns {Element} | |
| */ | |
| function findArticleRoot(doc) { | |
| if (!doc?.body) { | |
| throw new Error('document.body missing'); | |
| } | |
| const plain = findPlainTextRoot(doc); | |
| if (plain) return plain; | |
| if (typeof Readability !== 'function') { | |
| throw new Error('Readability missing — inject vendor/Readability.js first'); | |
| } | |
| mark(doc); | |
| try { | |
| const clone = doc.cloneNode(true); | |
| const reader = new Readability(clone); | |
| const parsed = reader.parse(); | |
| if (!parsed) { | |
| throw new Error('Readability: parse failed'); | |
| } | |
| const rid = reader._ilArticleRootRid; | |
| if (rid == null || rid === '') { | |
| throw new Error('Readability: no mappable article root'); | |
| } | |
| const root = doc.querySelector(`[${ATTR}="${CSS.escape(String(rid))}"]`); | |
| if (!root) { | |
| throw new Error(`Readability: live root not found (rid=${rid})`); | |
| } | |
| return root; | |
| } finally { | |
| unmark(doc); | |
| } | |
| } | |
| globalThis.IL_findArticleRoot = findArticleRoot; | |
| })(); | |