refactor(vtt-thumbnail): [PKG-VTT-THUMB-03] validate cues and separate pure lookup

docs/compiled/artplayer-plugin-vtt-thumbnail.js

@@ -4,4 +4,4 @@
  * (c) 2017-2026 Harvey Zhao
  * Released under the MIT License.
  */
-!function(t,e){"object"===typeof exports&&"undefined"!==typeof module?module.exports=e():"function"==typeof define&&define.amd?(t.artplayerPluginVttThumbnail=e(),define(function(){return t.artplayerPluginVttThumbnail})):(t="undefined"!==typeof globalThis?globalThis:t||self).artplayerPluginVttThumbnail=e()}(this,function(){"use strict";function t(t){const e=t.split("."),n=e[0].split(":")||[],o=(l=e[1]||"0",i=3,r="0",l.length>i?String(l):((i-=l.length)>r.length&&(r+=r.repeat(i/r.length)),String(l)+r.slice(0,i)));var l,i,r;const s=Number(o)/1e3;return 3600*Number(n[n.length-3]||0)+60*Number(n[n.length-2]||0)+Number(n[n.length-1]||0)+s}function e({lifetime:t,thumbnails:e,progress:n,duration:o,setStyle:l,isMobile:i}){let r=null,s=0;function c(e,n,o){t.closed||l(e,n,o)}return t.own(()=>{if(s++,null!==r){const t=r;r=null,clearTimeout(t)}}),l=>async(u,a,d)=>{if(t.closed)return;const f="played"===u&&d&&i;if("hover"!==u&&!f)return;const h=n.clientWidth*a,p=a*o();if(c(l,"display","flex"),t.closed)return;const m=e.find(t=>p>=t.start&&p<=t.end);if(!m)return c(l,"display","none");if(h>0&&h<n.clientWidth?function(t,e,o){c(t,"backgroundImage",`url(${e.url})`),c(t,"height",`${e.h}px`),c(t,"width",`${e.w}px`),c(t,"backgroundPosition",`-${e.x}px -${e.y}px`),o<=e.w/2?c(t,"left",0):o>n.clientWidth-e.w/2?c(t,"left",n.clientWidth-e.w+"px"):c(t,"left",o-e.w/2+"px")}(l,m,h):i||c(l,"display","none"),f&&!t.closed){const e=++s;if(null!==r&&clearTimeout(r),t.closed)return;const n=setTimeout(()=>{e!==s||t.closed||(r=null,c(l,"display","none"))},500);t.closed||e!==s?clearTimeout(n):r=n}}}return function(n){return async o=>{const{constructor:{utils:{setStyle:l,isMobile:i,addClass:r}},template:{$progress:s}}=o,c=function(t){let e=Boolean(t.isDestroy);const n=new Set;let o;const l=new Promise(t=>{o=t}),i={get closed(){return e},own:t=>(e?r(t):n.add(t),()=>n.delete(t)),listen(n,o){e||(i.own(()=>t.off(n,o)),t.on(n,o))},wait:t=>Promise.race([t,l]),dispose(){if(e)return;e=!0,o();const t=[...n].reverse();n.clear();for(const e of t)r(e)}};function r(t){try{t()}catch(e){console.warn("Failed to clean up VTT thumbnails:",e)}}try{i.listen("destroy",i.dispose)}catch(s){throw i.dispose(),s}return i}(o),u={name:"artplayerPluginVttThumbnail"};try{if(c.closed)return u;const a=n.vtt,d=await async function(t="",e){if(e.closed)return;const n="function"===typeof AbortController?new AbortController:null,o=e.own(()=>n?.abort());try{if(e.closed)return;const o=await e.wait(n?fetch(t,{signal:n.signal}):fetch(t));if(e.closed)return;if(!1===o.ok)throw new Error(`Failed to fetch VTT thumbnails: HTTP ${o.status}`);if(e.closed)return;return await e.wait(o.text())}finally{o()}}(a,c);if(c.closed)return u;const f=function(e,n=""){const o=e.split(/[\n\r]/g).filter(t=>t.trim()),l=[];for(let i=1;i<o.length;i+=2){const e=o[i],r=o[i+1];if(!r.trim())continue;const s=/((?:\d{2}:)?(?:\d{2}:)?\d{2}(?:.\d{3})?) ?--> ?((?:\d{2}:)?(?:\d{2}:)?\d{2}(?:.\d{3})?)/,c=e.match(s),u=/(.*)#(\w{4})=(.*)/,a=r.match(u),d=Math.floor(t(c[1])),f=Math.floor(t(c[2]));let h=a[1];if(!/^\/|(?:https?|ftp|file):\/\//i.test(h)){const t=n.split("/");t.pop(),t.push(h),h=t.join("/")}const p={start:d,end:f,url:h},m=a[2].split(""),y=a[3].split(",");for(let t=0;t<m.length;t++)p[m[t]]=y[t];l.push(p)}return l}(d,a),h=e({lifetime:c,thumbnails:f,progress:s,duration:()=>o.duration,setStyle:l,isMobile:i}),p=n.style||{};return c.closed||o.controls.add({name:"vtt-thumbnail",position:"top",index:20,style:p,mounted(t){c.own(()=>{o.controls["vtt-thumbnail"]===t&&o.controls.remove("vtt-thumbnail")}),c.closed||(r(t,"art-control-thumbnails"),c.listen("setBar",h(t)))}}),u}catch(a){throw c.dispose(),a}}}});
+!function(t,e){"object"===typeof exports&&"undefined"!==typeof module?module.exports=e():"function"==typeof define&&define.amd?(t.artplayerPluginVttThumbnail=e(),define(function(){return t.artplayerPluginVttThumbnail})):(t="undefined"!==typeof globalThis?globalThis:t||self).artplayerPluginVttThumbnail=e()}(this,function(){"use strict";function t(t,e){throw new TypeError(`Invalid VTT thumbnail at line ${t}: ${e}`)}function e(e,n){/^\d{2,}(?::\d{2}){0,2}(?:\.\d{3})?$/.test(e)||t(n,"invalid timestamp");const[i,o="0"]=e.split("."),r=i.split(":").reduce((t,e)=>60*t+Number(e),0)+Number(o)/1e3;return Number.isSafeInteger(Math.floor(r))||t(n,"timestamp exceeds the supported numeric range"),r}function n(e,n,i){const o=e.match(/^(.+)#([xywh]{4})=(.*)$/);o&&4===new Set(o[2]).size||t(i,"expected an image URL and four distinct xywh keys");const r=o[3].split(",").map(t=>t.trim());4!==r.length&&t(i,"expected four rectangle coordinates");const s={};for(let c=0;c<4;c++){const e=o[2][c],n=r[c];/^(?:\d+(?:\.\d+)?|\.\d+)$/.test(n)&&Number.isFinite(Number(n))||t(i,"rectangle coordinates must be finite non-negative decimals"),"w"!==e&&"h"!==e||0!==Number(n)||t(i,"rectangle width and height must be positive"),s[e]=n}let l=o[1];if(!/^\/|(?:https?|ftp|file):\/\//i.test(l)){const t=n.split("/");t.pop(),t.push(l),l=t.join("/")}return{url:l,...s}}function i({lifetime:t,thumbnails:e,progress:n,duration:i,setStyle:o,isMobile:r}){let s=null,l=0;function c(e,n,i){t.closed||o(e,n,i)}return t.own(()=>{if(l++,null!==s){const t=s;s=null,clearTimeout(t)}}),o=>async(u,a,d)=>{if(t.closed)return;const f="played"===u&&d&&r;if("hover"!==u&&!f)return;const m=n.clientWidth*a,h=a*i();if(c(o,"display","flex"),t.closed)return;const p=function(t,e){return t.find(t=>e>=t.start&&e<=t.end)}(e,h);if(!p)return c(o,"display","none");if(m>0&&m<n.clientWidth?function(t,e,i){c(t,"backgroundImage",`url(${e.url})`),c(t,"height",`${e.h}px`),c(t,"width",`${e.w}px`),c(t,"backgroundPosition",`-${e.x}px -${e.y}px`),i<=e.w/2?c(t,"left",0):i>n.clientWidth-e.w/2?c(t,"left",n.clientWidth-e.w+"px"):c(t,"left",i-e.w/2+"px")}(o,p,m):r||c(o,"display","none"),f&&!t.closed){const e=++l;if(null!==s&&clearTimeout(s),t.closed)return;const n=setTimeout(()=>{e!==l||t.closed||(s=null,c(o,"display","none"))},500);t.closed||e!==l?clearTimeout(n):s=n}}}return function(o){return async r=>{const{constructor:{utils:{setStyle:s,isMobile:l,addClass:c}},template:{$progress:u}}=r,a=function(t){let e=Boolean(t.isDestroy);const n=new Set;let i;const o=new Promise(t=>{i=t}),r={get closed(){return e},own:t=>(e?s(t):n.add(t),()=>n.delete(t)),listen(n,i){e||(r.own(()=>t.off(n,i)),t.on(n,i))},wait:t=>Promise.race([t,o]),dispose(){if(e)return;e=!0,i();const t=[...n].reverse();n.clear();for(const e of t)s(e)}};function s(t){try{t()}catch(e){console.warn("Failed to clean up VTT thumbnails:",e)}}try{r.listen("destroy",r.dispose)}catch(l){throw r.dispose(),l}return r}(r),d={name:"artplayerPluginVttThumbnail"};try{if(a.closed)return d;const f=o.vtt,m=await async function(t="",e){if(e.closed)return;const n="function"===typeof AbortController?new AbortController:null,i=e.own(()=>n?.abort());try{if(e.closed)return;const i=await e.wait(n?fetch(t,{signal:n.signal}):fetch(t));if(e.closed)return;if(!1===i.ok)throw new Error(`Failed to fetch VTT thumbnails: HTTP ${i.status}`);if(e.closed)return;return await e.wait(i.text())}finally{i()}}(f,a);if(a.closed)return d;const h=function(i,o=""){"string"!==typeof i&&t(1,"expected text");const r=i.replace(/^\uFEFF/,"").split(/\r\n|\r|\n/);let s=0;function l(){for(;s<r.length&&!r[s].trim();)s++}if(l(),s===r.length)return[];/^WEBVTT(?:[\t ].*)?$/.test(r[s].trim())&&!r[s].includes("--\x3e")||t(s+1,"expected WEBVTT header"),s++;const c=[];for(;s<r.length&&(l(),s!==r.length);){const i=r[s].trim();if(/^NOTE(?:[\t ]|$)/.test(i)||"STYLE"===i||"REGION"===i){for(;s<r.length&&r[s].trim();)s++;continue}const u=s+1;i.includes("--\x3e")||(s++,s!==r.length&&r[s].trim()||t(u,"cue identifier must be followed by timing"));const a=s+1,d=r[s].trim().match(/^([\d:.]+)[\t ]*-->[\t ]*([\d:.]+)(?:[\t ].*)?$/);d||t(a,"invalid cue timing");const f=e(d[1],a),m=e(d[2],a);m<f&&t(a,"cue end precedes its start"),s++,l(),s===r.length&&t(a,"missing sprite image");const h=n(r[s].trim(),o,s+1);c.push({start:Math.floor(f),end:Math.floor(m),...h}),s++}return c}(m,f),p=i({lifetime:a,thumbnails:h,progress:u,duration:()=>r.duration,setStyle:s,isMobile:l}),g=o.style||{};return a.closed||r.controls.add({name:"vtt-thumbnail",position:"top",index:20,style:g,mounted(t){a.own(()=>{r.controls["vtt-thumbnail"]===t&&r.controls.remove("vtt-thumbnail")}),a.closed||(c(t,"art-control-thumbnails"),a.listen("setBar",p(t)))}}),d}catch(f){throw a.dispose(),f}}}});