HIsheR
71 lines
3.7 KiB
JavaScript
71 lines
3.7 KiB
JavaScript
/*** @ui-arch 动效兜底审计：带 `infinite` 的动画必须在 prefers-reduced-motion 下被显式关掉
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*
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* 为什么单独成门禁：`audit:visual` 只管字面量、`verify` 只管「动效时长走令牌」，没人管「无限循环动画有没有降级」。
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* 循环动画（转圈、扫光、进度条流纹、时间线脉冲）是前庭敏感用户的硬伤，漏一条就等于把整页交给抖动；
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* 有限时长的过渡（hover 上浮之类）危害小得多，不在本门禁范围——只盯 infinite 才有明确可执行的判定。
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*/
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import fs from 'node:fs';
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import path from 'node:path';
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/*** 作用：被审计的样式表相对仓库根的路径 ***/
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const CSS_REL = 'packages/skin/ui/ui.css';
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/*** 作用：极简 CSS 规则扫描器——按大括号层级切出 { 选择器, 规则体, 是否在减少动效媒体块内 }（尾缓冲在 ; 与 } 处清空，遇 { 即为选择器） ***/
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export function scanRules(css) {
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const rules = [];
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const stack = [];
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let tail = ''; // 当前块内自上个 ; 或 } 以来的文本：遇 { 即为选择器
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const clean = (text) => text.replace(/\/\*[\s\S]*?\*\//g, '').trim(); // 剥掉前导注释再比对
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for (const ch of css) {
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if (ch === '{') {
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const prelude = clean(tail);
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stack.push({ prelude, reduced: prelude.startsWith('@media') && /prefers-reduced-motion/.test(prelude), body: '' });
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tail = '';
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continue;
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}
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if (ch === '}') {
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const frame = stack.pop();
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if (!frame) { tail = ''; continue; }
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const parentReduced = stack.length ? stack[stack.length - 1].reduced : false;
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if (frame.prelude && !frame.prelude.startsWith('@')) {
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rules.push({ selector: frame.prelude, body: frame.body, reduced: frame.reduced || parentReduced });
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}
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tail = '';
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continue;
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}
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if (stack.length) stack[stack.length - 1].body += ch;
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tail += ch;
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if (ch === ';') tail = '';
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}
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return rules;
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}
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/*** 作用：拆选择器组（`.a, .b` → 两项），去掉伪元素后缀，便于与降级块里的写法对齐 ***/
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const splitSelectors = (selector) => selector.split(',').map((s) => s.trim().replace(/::?(before|after)/g, '')).filter(Boolean);
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/*** 作用：跑一遍审计：返回无限动画清单与缺口（有 animation 声明但没在降级块里关掉的） ***/
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export function auditMotion(root) {
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const file = path.join(root, CSS_REL);
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if (!fs.existsSync(file)) throw new Error(`找不到 ${CSS_REL}`);
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const css = fs.readFileSync(file, 'utf8').replace(/\r\n/g, '\n');
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const rules = scanRules(css);
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// 无限动画：动画名后面带 infinite（本项目写法固定，正则认出关键片段即可）
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const infinite = rules.filter((r) => !r.reduced && /animation\s*:[^;]*\binfinite\b/.test(r.body));
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// 降级：减少动效块里把动画关掉的规则（animation: none 或 duration 归零两种写法都算达标）
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const offline = new Set(
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rules.filter((r) => r.reduced && /animation\s*:\s*none|animation-duration\s*:\s*0/.test(r.body))
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.flatMap((r) => splitSelectors(r.selector)),
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);
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const entries = infinite.flatMap((r) => splitSelectors(r.selector).map((selector) => ({ selector, covered: offline.has(selector) })));
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return { total: entries.length, entries, gaps: entries.filter((e) => !e.covered) };
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}
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/*** 作用：把审计结果打成文本表（人读模式） ***/
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export function formatMotionReport({ entries, gaps }) {
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const lines = ['无限动画的减少动效兜底：'];
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for (const e of entries) lines.push(` ${e.covered ? 'OK ' : 'MISS'} ${e.selector}`);
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lines.push('');
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lines.push(gaps.length ? `缺兜底 ${gaps.length} 处：${gaps.map((g) => g.selector).join(' / ')}` : `全部 ${entries.length} 处无限动画都有 prefers-reduced-motion 兜底`);
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return lines.join('\n');
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}
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