refactor(multiple-subtitles): [PKG-MULTI-SUB-03] own requests and subtitle resources

packages/artplayer-plugin-multiple-subtitles/ARCHITECTURE.md

@@ -8,9 +8,15 @@ task PKG-MULTI-SUB-04 owns that compatibility work. Do not infer runtime behavio
 
 ## Current module boundaries
 
-- `src/index.js` currently combines download/decode, conversion, parsing, merging, Blob URL
-  replacement and public registration. Task 03 will separate pure merge, requests and owned
-  resources while preserving the factory and CSS hooks.
+- `src/index.js` composes registration, named selection and the unchanged public result.
+- `src/request.js` owns each fetch through byte decoding and delegates SRT/ASS conversion
+  to the existing core utils. Failure aborts the request; registration failure closes siblings.
+- `src/merge.js` parses metadata and serializes selected cues without mutating parsed trees.
+  It depends only on the vendor parser, not the player or browser resource APIs.
+- `src/lifetime.js` owns the destroy listener, request cancellation and resource callbacks.
+  Its cancellation Promise also settles pending operations without AbortController support.
+- `src/render.js` owns generated Blob URLs and synchronous/async host installation outcomes.
+  Reentrant selections and stale host rejections cannot release the latest selected resource.
 - `src/parser.js` is vendored WebVTT parser/serializer code with a CC0 dedication. It is not
   owned plugin code to mechanically migrate to TypeScript. Keep it distinct from task 04.
   The pinned upstream reference and full adaptation check are in
@@ -23,19 +29,22 @@ task PKG-MULTI-SUB-04 owns that compatibility work. Do not infer runtime behavio
 All tracks download concurrently and decode through TextDecoder. Explicit type wins over
 the URL extension; SRT/ASS conversion delegates to existing core utils. `onParser` appears
 in declarations but is not called. Parsing runs in metadata mode. Each track's top-level
-cue text receives a name-based div once; current merging concatenates cue arrays by track
+cue text receives a name-based div in a copied cue; merging concatenates cue arrays by track
 order, whereas 1.0.0 merged by cue index and retained the first track's timestamps.
 
-Each selection serializes a new VTT, revokes the preceding URL, creates a text/vtt Blob,
-sets the live subtitle option's escape to false and calls subtitle.init with the live
-configuration plus URL/type/onVttLoad overrides. The latest URL and pending requests have
-no destroy owner yet. These are explicit future fixes, not behavior to silently call safe.
+Each selection serializes VTT and allocates a text/vtt Blob before replacing the preceding
+URL. It sets the live subtitle option's escape to false and calls subtitle.init with live
+configuration plus URL/type/onVttLoad overrides. Allocation failure preserves the prior URL;
+synchronous installation failure releases the new URL and restores the previous ownership.
+Async host failure is observed and releases only the failed active installation, with a warning
+while alive. The plugin cannot generically undo host side effects after asynchronous failure.
+Registration does not await host media loading, and selection methods remain void.
 
-The failure baseline now reproduces late fetch/body installation, retained and newly allocated
-URLs after destroy, ignored HTTP failures, orphaned URLs after init failures, and revoking the
-old URL before a new allocation can fail. Async init rejection is currently unobserved by the
-plugin. Task 03 must handle these internal failures while retaining the void selection methods.
-Keep the current parser's best-effort behavior separate from these resource fixes: invalid-header
+Destroy cancels pending requests, settles registration with an inert result, releases owned
+URLs and removes its listener. Retained methods become no-ops; restart does not refetch tracks.
+Do not restore the shared escape option on normal destroy: another consumer may now own it.
+The historical failure suite deliberately retains the old outcomes; the candidate lifecycle
+suite verifies their fixes. Preserve parser best-effort behavior independently: invalid-header
 diagnostics can coexist with usable cues, and metadata is intentionally read after download.
 
 ## Vendor boundary and validation
@@ -51,6 +60,7 @@ Use the pinned Node and Yarn 1.22.22:
 ```sh
 yarn test:multiple-subtitles
 yarn test:browser test/browser/multiple-subtitles-history.spec.js
+yarn test:browser test/browser/multiple-subtitles-lifecycle.spec.js
 yarn build artplayer-plugin-multiple-subtitles
 ```
 
@@ -63,5 +73,9 @@ uses actual 1.2.0 main with published/candidate cores: SRT display and selection
 fetch after destroy, and native Blob readability/late reset allocations. It covers Chromium,
 Firefox and Windows WebKit; it is not all historical cores, ASS display or physical Safari.
 The failure unit suite uses real current core converters and TextDecoder for SRT/ASS/encodings.
+Candidate lifecycle and merge suites cover cancellation, failures, resource ownership,
+reentrancy and immutable serialization. The candidate browser suite adds real video source
+switching, HTTP rejection and Blob revocation. For main/legacy validation, set the artifact
+environment variable above before running it; source builds are used when it is absent.
 Tasks 05/06 still own complete core/device combinations and demo acceptance.
 See `../../refactor/baselines/multiple-subtitles-contract.md` for exact historical differences.

packages/artplayer-plugin-multiple-subtitles/dist/artplayer-plugin-multiple-subtitles.js

@@ -55,4 +55,4 @@
  *
  *     d. Affirmer understands and acknowledges that Creative Commons is not a party to this document and has no duty or obligation with respect to this CC0 or use of the Work.
  */
-!function(e,t){"object"===typeof exports&&"undefined"!==typeof module?module.exports=t():"function"==typeof define&&define.amd?(e.artplayerPluginMultipleSubtitles=t(),define(function(){return e.artplayerPluginMultipleSubtitles})):(e="undefined"!==typeof globalThis?globalThis:e||self).artplayerPluginMultipleSubtitles=t()}(this,function(){"use strict";var e={direction:"horizontal",snapToLines:!0,linePosition:"auto",lineAlign:"start",textPosition:"auto",positionAlign:"auto",size:100,alignment:"center"},t=function(t){t||(t={"&amp":"&","&lt":"<","&gt":">","&lrm":"\u200e","&rlm":"\u200f","&nbsp":"\xa0"}),this.entities=t,this.parse=function(a,s){a=a.replace(/\0/g,"\ufffd");var r=Date.now(),o=0,l=a.split(/\r\n|\r|\n/),f=!1,c=[],u=[],d=[];function p(e,t){d.push({message:e,line:o+1,col:t})}var m=l[o],g=m.length,h="WEBVTT",v=0,b=6;for("\ufeff"===m[0]&&(v=1,b+=1),(g<b||m.indexOf(h)!==0+v||g>b&&" "!==m[b]&&"\t"!==m[b])&&p('No valid signature. 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+!function(e,t){"object"===typeof exports&&"undefined"!==typeof module?module.exports=t():"function"==typeof define&&define.amd?(e.artplayerPluginMultipleSubtitles=t(),define(function(){return e.artplayerPluginMultipleSubtitles})):(e="undefined"!==typeof globalThis?globalThis:e||self).artplayerPluginMultipleSubtitles=t()}(this,function(){"use strict";var e={direction:"horizontal",snapToLines:!0,linePosition:"auto",lineAlign:"start",textPosition:"auto",positionAlign:"auto",size:100,alignment:"center"},t=function(t){t||(t={"&amp":"&","&lt":"<","&gt":">","&lrm":"\u200e","&rlm":"\u200f","&nbsp":"\xa0"}),this.entities=t,this.parse=function(s,a){s=s.replace(/\0/g,"\ufffd");var r=Date.now(),o=0,l=s.split(/\r\n|\r|\n/),c=!1,f=[],u=[],d=[];function p(e,t){d.push({message:e,line:o+1,col:t})}var m=l[o],g=m.length,h="WEBVTT",v=0,b=6;for("\ufeff"===m[0]&&(v=1,b+=1),(g<b||m.indexOf(h)!==0+v||g>b&&" "!==m[b]&&"\t"!==m[b])&&p('No valid signature. 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packages/artplayer-plugin-multiple-subtitles/dist/artplayer-plugin-multiple-subtitles.legacy.js

@@ -55,4 +55,4 @@
  *
  *     d. Affirmer understands and acknowledges that Creative Commons is not a party to this document and has no duty or obligation with respect to this CC0 or use of the Work.
  */
-!function(e,t){"object"===typeof exports&&"undefined"!==typeof module?module.exports=t():"function"==typeof define&&define.amd?(e.artplayerPluginMultipleSubtitles=t(),define(function(){return e.artplayerPluginMultipleSubtitles})):(e="undefined"!==typeof globalThis?globalThis:e||self).artplayerPluginMultipleSubtitles=t()}(this,function(){"use strict";var e=Object.defineProperty,t=Object.defineProperties,n=Object.getOwnPropertyDescriptors,i=Object.getOwnPropertySymbols,a=Object.prototype.hasOwnProperty,s=Object.prototype.propertyIsEnumerable,r=(t,n,i)=>n in t?e(t,n,{enumerable:!0,configurable:!0,writable:!0,value:i}):t[n]=i,o=(e,t)=>{for(var n in t||(t={}))a.call(t,n)&&r(e,n,t[n]);if(i)for(var n of i(t))s.call(t,n)&&r(e,n,t[n]);return e},l=(e,t,n)=>new Promise((i,a)=>{var s=e=>{try{o(n.next(e))}catch(t){a(t)}},r=e=>{try{o(n.throw(e))}catch(t){a(t)}},o=e=>e.done?i(e.value):Promise.resolve(e.value).then(s,r);o((n=n.apply(e,t)).next())}),f={direction:"horizontal",snapToLines:!0,linePosition:"auto",lineAlign:"start",textPosition:"auto",positionAlign:"auto",size:100,alignment:"center"},c=function(e){e||(e={"&amp":"&","&lt":"<","&gt":">","&lrm":"\u200e","&rlm":"\u200f","&nbsp":"\xa0"}),this.entities=e,this.parse=function(t,n){t=t.replace(/\0/g,"\ufffd");var i=Date.now(),a=0,s=t.split(/\r\n|\r|\n/),r=!1,o=[],l=[],c=[];function p(e,t){c.push({message:e,line:a+1,col:t})}var m=s[a],g=m.length,h="WEBVTT",v=0,b=6;for("\ufeff"===m[0]&&(v=1,b+=1),(g<b||m.indexOf(h)!==0+v||g>b&&" "!==m[b]&&"\t"!==m[b])&&p('No valid signature. (File needs to start with "WEBVTT".)'),a++;""!=s[a]&&void 0!=s[a];){if(p("No blank line after the signature."),-1!=s[a].indexOf("--\x3e")){r=!0;break}a++}for(;void 0!=s[a];){for(var x;!r&&""==s[a];)a++;if(!r&&void 0==s[a])break;x=Object.assign({},f,{id:"",startTime:0,endTime:0,pauseOnExit:!1,direction:"horizontal",snapToLines:!0,linePosition:"auto",lineAlign:"start",textPosition:"auto",positionAlign:"auto",size:100,alignment:"center",text:"",tree:null});var T=!0;if(-1==s[a].indexOf("--\x3e")){if(x.id=s[a],/^NOTE($|[ \t])/.test(x.id)){for(a++;""!=s[a]&&void 0!=s[a];)-1!=s[a].indexOf("--\x3e")&&p("Cannot have timestamp in a comment."),a++;continue}if(/^STYLE($|[ \t])/.test(x.id)){var y=[],w=!1;for(a++;""!=s[a]&&void 0!=s[a];)-1!=s[a].indexOf("--\x3e")&&(p("Cannot have timestamp in a style block."),w=!0),y.push(s[a]),a++;if(l.length){p("Style blocks cannot appear after the first cue.");continue}w||o.push(y.join("\n"));continue}if(""==s[++a]||void 0==s[a]){p("Cue identifier cannot be standalone.");continue}if(-1==s[a].indexOf("--\x3e")){T=!1,p("Cue identifier needs to be followed by timestamp.");continue}}r=!1;var O=new u(s[a],p),P=0;if(l.length>0&&(P=l[l.length-1].startTime),!T||O.parse(x,P)){for(a++;""!=s[a]&&void 0!=s[a];){if(-1!=s[a].indexOf("--\x3e")){p("Blank line missing before cue."),r=!0;break}""!=x.text&&(x.text+="\n"),x.text+=s[a],a++}var I=new d(x.text,p,n,e);x.tree=I.parse(x.startTime,x.endTime),l.push(x)}else for(x=null,a++;""!=s[a]&&void 0!=s[a];){if(-1!=s[a].indexOf("--\x3e")){r=!0;break}a++}}return l.sort(function(e,t){return e.startTime<t.startTime?-1:e.startTime>t.startTime?1:e.endTime>t.endTime?-1:e.endTime<t.endTime?1:0}),{cues:l,errors:c,time:Date.now()-i,styles:o}}},u=function(e,t){var n=/[\u0020\t\f]/,i=/[^\u0020\t\f]/,a=(e=e,0),s=function(e){t(e,a+1)};function r(t){for(;void 0!=e[a]&&t.test(e[a]);)a++}function o(t){for(var n="";void 0!=e[a]&&t.test(e[a]);)n+=e[a],a++;return n}function l(){var t,n,i,r,l="minutes";if(void 0!=e[a])if(/\d/.test(e[a]))if(((t=o(/\d/)).length>2||parseInt(t,10)>59)&&(l="hours"),":"==e[a])if(a++,2==(n=o(/\d/)).length){if("hours"==l||":"==e[a]){if(":"!=e[a])return void s("No seconds found or minutes is greater than 59.");if(a++,2!=(i=o(/\d/)).length)return void s("Must be exactly two digits.")}else{if(2!=t.length)return void s("Must be exactly two digits.");i=n,n=t,t="0"}if("."==e[a])if(a++,3==(r=o(/\d/)).length)if(parseInt(n,10)>59)s("You cannot have more than 59 minutes.");else{if(!(parseInt(i,10)>59))return 60*parseInt(t,10)*60+60*parseInt(n,10)+parseInt(i,10)+parseInt(r,10)/1e3;s("You cannot have more than 59 seconds.")}else s("Milliseconds must be given in three digits.");else s('No decimal separator (".") found.')}else s("Must be exactly two digits.");else s("No time unit separator found.");else s("Timestamp must start with a character in the range 0-9.");else s("No timestamp found.")}this.parse=function(t,o){if(r(n),t.startTime=l(),void 0!=t.startTime)if(t.startTime<o&&s("Start timestamp is not greater than or equal to start timestamp of previous cue."),i.test(e[a])&&s("Timestamp not separated from '--\x3e' by whitespace."),r(n),"-"==e[a])if(a++,"-"==e[a])if(a++,">"==e[a]){if(a++,i.test(e[a])&&s("'--\x3e' not separated from timestamp by whitespace."),r(n),t.endTime=l(),void 0!=t.endTime)return t.endTime<=t.startTime&&s("End timestamp is not greater than start timestamp."),i.test(e[a]),r(n),function(e,t){for(var i=e.split(n),a=[],r=0;r<i.length;r++)ifLine truncated
+!function(e,t){"object"===typeof exports&&"undefined"!==typeof module?module.exports=t():"function"==typeof define&&define.amd?(e.artplayerPluginMultipleSubtitles=t(),define(function(){return e.artplayerPluginMultipleSubtitles})):(e="undefined"!==typeof globalThis?globalThis:e||self).artplayerPluginMultipleSubtitles=t()}(this,function(){"use strict";var e=Object.defineProperty,t=Object.defineProperties,n=Object.getOwnPropertyDescriptors,i=Object.getOwnPropertySymbols,r=Object.prototype.hasOwnProperty,s=Object.prototype.propertyIsEnumerable,a=(t,n,i)=>n in t?e(t,n,{enumerable:!0,configurable:!0,writable:!0,value:i}):t[n]=i,o=(e,t)=>{for(var n in t||(t={}))r.call(t,n)&&a(e,n,t[n]);if(i)for(var n of i(t))s.call(t,n)&&a(e,n,t[n]);return e},l=(e,i)=>t(e,n(i)),c=(e,t,n)=>new Promise((i,r)=>{var s=e=>{try{o(n.next(e))}catch(t){r(t)}},a=e=>{try{o(n.throw(e))}catch(t){r(t)}},o=e=>e.done?i(e.value):Promise.resolve(e.value).then(s,a);o((n=n.apply(e,t)).next())});var f={direction:"horizontal",snapToLines:!0,linePosition:"auto",lineAlign:"start",textPosition:"auto",positionAlign:"auto",size:100,alignment:"center"},u=function(e){e||(e={"&amp":"&","&lt":"<","&gt":">","&lrm":"\u200e","&rlm":"\u200f","&nbsp":"\xa0"}),this.entities=e,this.parse=function(t,n){t=t.replace(/\0/g,"\ufffd");var i=Date.now(),r=0,s=t.split(/\r\n|\r|\n/),a=!1,o=[],l=[],c=[];function u(e,t){c.push({message:e,line:r+1,col:t})}var m=s[r],g=m.length,h="WEBVTT",v=0,b=6;for("\ufeff"===m[0]&&(v=1,b+=1),(g<b||m.indexOf(h)!==0+v||g>b&&" "!==m[b]&&"\t"!==m[b])&&u('No valid signature. (File needs to start with "WEBVTT".)'),r++;""!=s[r]&&void 0!=s[r];){if(u("No blank line after the signature."),-1!=s[r].indexOf("--\x3e")){a=!0;break}r++}for(;void 0!=s[r];){for(var y;!a&&""==s[r];)r++;if(!a&&void 0==s[r])break;y=Object.assign({},f,{id:"",startTime:0,endTime:0,pauseOnExit:!1,direction:"horizontal",snapToLines:!0,linePosition:"auto",lineAlign:"start",textPosition:"auto",positionAlign:"auto",size:100,alignment:"center",text:"",tree:null});var x=!0;if(-1==s[r].indexOf("--\x3e")){if(y.id=s[r],/^NOTE($|[ \t])/.test(y.id)){for(r++;""!=s[r]&&void 0!=s[r];)-1!=s[r].indexOf("--\x3e")&&u("Cannot have timestamp in a comment."),r++;continue}if(/^STYLE($|[ \t])/.test(y.id)){var T=[],w=!1;for(r++;""!=s[r]&&void 0!=s[r];)-1!=s[r].indexOf("--\x3e")&&(u("Cannot have timestamp in a style block."),w=!0),T.push(s[r]),r++;if(l.length){u("Style blocks cannot appear after the first cue.");continue}w||o.push(T.join("\n"));continue}if(""==s[++r]||void 0==s[r]){u("Cue identifier cannot be standalone.");continue}if(-1==s[r].indexOf("--\x3e")){x=!1,u("Cue identifier needs to be followed by timestamp.");continue}}a=!1;var O=new d(s[r],u),P=0;if(l.length>0&&(P=l[l.length-1].startTime),!x||O.parse(y,P)){for(r++;""!=s[r]&&void 0!=s[r];){if(-1!=s[r].indexOf("--\x3e")){u("Blank line missing before cue."),a=!0;break}""!=y.text&&(y.text+="\n"),y.text+=s[r],r++}var A=new p(y.text,u,n,e);y.tree=A.parse(y.startTime,y.endTime),l.push(y)}else for(y=null,r++;""!=s[r]&&void 0!=s[r];){if(-1!=s[r].indexOf("--\x3e")){a=!0;break}r++}}return l.sort(function(e,t){return e.startTime<t.startTime?-1:e.startTime>t.startTime?1:e.endTime>t.endTime?-1:e.endTime<t.endTime?1:0}),{cues:l,errors:c,time:Date.now()-i,styles:o}}},d=function(e,t){var n=/[\u0020\t\f]/,i=/[^\u0020\t\f]/,r=(e=e,0),s=function(e){t(e,r+1)};function a(t){for(;void 0!=e[r]&&t.test(e[r]);)r++}function o(t){for(var n="";void 0!=e[r]&&t.test(e[r]);)n+=e[r],r++;return n}function l(){var t,n,i,a,l="minutes";if(void 0!=e[r])if(/\d/.test(e[r]))if(((t=o(/\d/)).length>2||parseInt(t,10)>59)&&(l="hours"),":"==e[r])if(r++,2==(n=o(/\d/)).length){if("hours"==l||":"==e[r]){if(":"!=e[r])return void s("No seconds found or minutes is greater than 59.");if(r++,2!=(i=o(/\d/)).length)return void s("Must be exactly two digits.")}else{if(2!=t.length)return void s("Must be exactly two digits.");i=n,n=t,t="0"}if("."==e[r])if(r++,3==(a=o(/\d/)).length)if(parseInt(n,10)>59)s("You cannot have more than 59 minutes.");else{if(!(parseInt(i,10)>59))return 60*parseInt(t,10)*60+60*parseInt(n,10)+parseInt(i,10)+parseInt(a,10)/1e3;s("You cannot have more than 59 seconds.")}else s("Milliseconds must be given in three digits.");else s('No decimal separator (".") found.')}else s("Must be exactly two digits.");else s("No time unit separator found.");else s("Timestamp must start with a character in the range 0-9.");else s("No timestamp found.")}this.parse=function(t,o){if(a(n),t.startTime=l(),void 0!=t.startTime)if(t.startTime<o&&s("Start timestamp is not greater than or equal to start timestamp of previous cue."),i.test(e[r])&&s("Timestamp not separated from '--\x3e' by whitespace."),a(n),"-"==e[r])if(r++,"-"==e[r])if(r++,">"==e[r]){if(r++,i.test(e[r])&&s("'--\x3e' not separated from timestamp by whitespace."),a(n),t.endTime=l(),void 0!=t.endTime)return t.endTime<=t.startTime&&s("End timestamp is not greater than start timestamp."),i.test(e[r]),a(n),function(e,t){for(var i=e.split(n),r=[Line truncated

packages/artplayer-plugin-multiple-subtitles/dist/artplayer-plugin-multiple-subtitles.mjs

@@ -55,6 +55,56 @@
  *
  *     d. Affirmer understands and acknowledges that Creative Commons is not a party to this document and has no duty or obligation with respect to this CC0 or use of the Work.
  */
+function createLifetime(art) {
+  let closed = Boolean(art.isDestroy);
+  const cleanups = /* @__PURE__ */ new Set();
+  let cancel;
+  const cancelled = new Promise((resolve) => {
+    cancel = resolve;
+  });
+  function run(cleanup) {
+    try {
+      cleanup();
+    } catch (error) {
+      console.warn("Failed to clean up multiple subtitles:", error);
+    }
+  }
+  const lifetime = {
+    get closed() {
+      return closed;
+    },
+    own(cleanup) {
+      if (closed)
+        run(cleanup);
+      else
+        cleanups.add(cleanup);
+      return () => cleanups.delete(cleanup);
+    },
+    wait(value) {
+      return Promise.race([value, cancelled]);
+    },
+    dispose() {
+      if (closed)
+        return;
+      closed = true;
+      cancel();
+      const pending = [...cleanups].reverse();
+      cleanups.clear();
+      for (const cleanup of pending)
+        run(cleanup);
+    }
+  };
+  if (!closed) {
+    lifetime.own(() => art.off("destroy", lifetime.dispose));
+    try {
+      art.on("destroy", lifetime.dispose);
+    } catch (error) {
+      lifetime.dispose();
+      throw error;
+    }
+  }
+  return lifetime;
+}
 var defaultCueSettings = {
   direction: "horizontal",
   snapToLines: true,
@@ -799,85 +849,166 @@ var WebVTTSerializer = function() {
     return result;
   };
 };
-async function loadVtt(option, { getExt, srtToVtt, assToVtt }) {
-  const response = await fetch(option.url);
-  const buffer = await response.arrayBuffer();
-  const decoder = new TextDecoder(option.encoding || "utf-8");
-  const text = decoder.decode(buffer);
-  switch (option.type || getExt(option.url)) {
-    case "srt": {
-      return srtToVtt(text);
-    }
-    case "ass": {
-      return assToVtt(text);
-    }
-    case "vtt": {
-      return text;
-    }
-    default:
-      return "";
-  }
-}
-function mergeTrees(trees) {
+function parseTracks(vtts, subtitles) {
   const parser = new WebVTTParser();
-  const result = parser.parse("", "metadata");
-  for (let i = 0; i < trees.length; i++) {
-    const tree = trees[i];
-    if (!tree.updated) {
-      tree.updated = true;
-      for (let j = 0; j < tree.cues.length; j++) {
-        const cue = tree.cues[j];
-        for (let k = 0; k < cue.tree.children.length; k++) {
-          const children = cue.tree.children[k];
-          children.value = `<div class="art-subtitle-${tree.name}">${children.value}</div>`;
+  return vtts.map((vtt, index) => {
+    const tree = parser.parse(vtt, "metadata");
+    tree.url = subtitles[index].url;
+    tree.name = subtitles[index].name;
+    return tree;
+  });
+}
+function serializeTracks(trees) {
+  const cues = [];
+  for (const tree of trees) {
+    for (const cue of tree.cues) {
+      cues.push({
+        ...cue,
+        tree: {
+          ...cue.tree,
+          children: cue.tree.children.map((child) => ({
+            ...child,
+            value: `<div class="art-subtitle-${tree.name}">${child.value}</div>`
+          }))
         }
-      }
+      });
     }
-    result.cues.push(...tree.cues);
   }
-  return result;
+  return new WebVTTSerializer().serialize(cues);
+}
+function createRenderer(art, lifetime, unescape) {
+  let current = null;
+  function own(url) {
+    let freed = false;
+    let release = () => {
+    };
+    const entry = {
+      free() {
+        if (freed)
+          return;
+        freed = true;
+        release();
+        URL.revokeObjectURL(url);
+      }
+    };
+    release = lifetime.own(entry.free);
+    return entry;
+  }
+  return (vtt) => {
+    if (lifetime.closed)
+      return;
+    const url = URL.createObjectURL(new Blob([vtt], { type: "text/vtt" }));
+    const entry = own(url);
+    if (lifetime.closed)
+      return;
+    const previous = current;
+    let option;
+    let escape;
+    let configured = false;
+    current = entry;
+    try {
+      option = art.option.subtitle;
+      escape = option.escape;
+      if (lifetime.closed || current !== entry)
+        return;
+      option.escape = false;
+      configured = true;
+      const config = { ...option, url, type: "vtt", onVttLoad: unescape };
+      if (lifetime.closed || current !== entry)
+        return;
+      const pending = art.subtitle.init(config);
+      Promise.resolve(pending).catch((error) => {
+        if (current === entry) {
+          current = null;
+          entry.free();
+        }
+        if (!lifetime.closed)
+          console.warn("Failed to initialize multiple subtitles:", error);
+      });
+    } catch (error) {
+      if (current === entry) {
+        current = previous;
+        if (configured && option.escape === false)
+          option.escape = escape;
+      }
+      entry.free();
+      throw error;
+    } finally {
+      if (previous !== current)
+        previous?.free();
+      if (entry !== current)
+        entry.free();
+    }
+  };
+}
+async function loadVtt(option, { getExt, srtToVtt, assToVtt }, lifetime) {
+  if (lifetime.closed)
+    return;
+  const controller = typeof AbortController === "function" ? new AbortController() : null;
+  const release = lifetime.own(() => controller?.abort());
+  try {
+    const url = option.url;
+    if (lifetime.closed)
+      return;
+    const response = await lifetime.wait(controller ? fetch(url, { signal: controller.signal }) : fetch(url));
+    if (lifetime.closed)
+      return;
+    if (response.ok === false)
+      throw new Error(`Failed to fetch multiple subtitles: HTTP ${response.status}`);
+    const buffer = await lifetime.wait(response.arrayBuffer());
+    if (lifetime.closed)
+      return;
+    const text = new TextDecoder(option.encoding || "utf-8").decode(buffer);
+    switch (option.type || getExt(option.url)) {
+      case "srt":
+        return srtToVtt(text);
+      case "ass":
+        return assToVtt(text);
+      case "vtt":
+        return text;
+      default:
+        return "";
+    }
+  } catch (error) {
+    controller?.abort();
+    throw error;
+  } finally {
+    release();
+  }
 }
 function artplayerPluginMultipleSubtitles({ subtitles = [] }) {
   return async (art) => {
     const { unescape, getExt, srtToVtt, assToVtt } = art.constructor.utils;
-    const parser = new WebVTTParser();
-    const seri = new WebVTTSerializer();
-    const vtts = await Promise.all(
-      subtitles.map((option) => {
-        return loadVtt(option, { getExt, srtToVtt, assToVtt });
-      })
-    );
-    const trees = vtts.map((vtt, index) => {
-      const tree = parser.parse(vtt, "metadata");
-      tree.url = subtitles[index].url;
-      tree.name = subtitles[index].name;
-      return tree;
-    });
-    let lastUrl = "";
-    function setTracks(trees2 = []) {
-      const tree = mergeTrees(trees2);
-      const vtt = seri.serialize(tree.cues);
-      URL.revokeObjectURL(lastUrl);
-      const url = URL.createObjectURL(new Blob([vtt], { type: "text/vtt" }));
-      lastUrl = url;
-      art.option.subtitle.escape = false;
-      art.subtitle.init({
-        ...art.option.subtitle,
-        url,
-        type: "vtt",
-        onVttLoad: unescape
-      });
+    const lifetime = createLifetime(art);
+    const render = createRenderer(art, lifetime, unescape);
+    let trees = [];
+    function setTracks(selected) {
+      if (!lifetime.closed)
+        render(serializeTracks(selected));
     }
-    setTracks(trees);
-    return {
+    const result = {
       name: "multipleSubtitles",
       tracks(names = []) {
-        return setTracks(names.map((name) => trees.find((tree) => tree.name === name)));
+        if (!lifetime.closed)
+          setTracks(names.map((name) => trees.find((tree) => tree.name === name)));
       },
       reset() {
-        return setTracks(trees);
+        setTracks(trees);
       }
     };
+    try {
+      if (lifetime.closed)
+        return result;
+      const vtts = await Promise.all(subtitles.map((option) => loadVtt(option, { getExt, srtToVtt, assToVtt }, lifetime)));
+      if (lifetime.closed)
+        return result;
+      trees = parseTracks(vtts, subtitles);
+      setTracks(trees);
+      return result;
+    } catch (error) {
+      lifetime.dispose();
+      throw error;
+    }
   };
 }
 export {

packages/artplayer-plugin-multiple-subtitles/src/index.js

@@ -1,95 +1,41 @@
-import { WebVTTParser, WebVTTSerializer } from './parser'
-
-async function loadVtt(option, { getExt, srtToVtt, assToVtt }) {
-  const response = await fetch(option.url)
-  const buffer = await response.arrayBuffer()
-  const decoder = new TextDecoder(option.encoding || 'utf-8')
-  const text = decoder.decode(buffer)
-  switch (option.type || getExt(option.url)) {
-    case 'srt': {
-      return srtToVtt(text)
-    }
-    case 'ass': {
-      return assToVtt(text)
-    }
-    case 'vtt': {
-      return text
-    }
-    default:
-      return ''
-  }
-}
-
-function mergeTrees(trees) {
-  const parser = new WebVTTParser()
-  const result = parser.parse('', 'metadata')
-
-  for (let i = 0; i < trees.length; i++) {
-    const tree = trees[i]
-
-    if (!tree.updated) {
-      tree.updated = true
-      for (let j = 0; j < tree.cues.length; j++) {
-        const cue = tree.cues[j]
-        for (let k = 0; k < cue.tree.children.length; k++) {
-          const children = cue.tree.children[k]
-          children.value = `<div class="art-subtitle-${tree.name}">${children.value}</div>`
-        }
-      }
-    }
-
-    result.cues.push(...tree.cues)
-  }
-
-  return result
-}
+import createLifetime from './lifetime'
+import { parseTracks, serializeTracks } from './merge'
+import createRenderer from './render'
+import loadVtt from './request'
 
 export default function artplayerPluginMultipleSubtitles({ subtitles = [] }) {
   return async (art) => {
     const { unescape, getExt, srtToVtt, assToVtt } = art.constructor.utils
-
-    const parser = new WebVTTParser()
-    const seri = new WebVTTSerializer()
-
-    const vtts = await Promise.all(
-      subtitles.map((option) => {
-        return loadVtt(option, { getExt, srtToVtt, assToVtt })
-      }),
-    )
-
-    const trees = vtts.map((vtt, index) => {
-      const tree = parser.parse(vtt, 'metadata')
-      tree.url = subtitles[index].url
-      tree.name = subtitles[index].name
-      return tree
-    })
-
-    let lastUrl = ''
-    function setTracks(trees = []) {
-      const tree = mergeTrees(trees)
-      const vtt = seri.serialize(tree.cues)
-      URL.revokeObjectURL(lastUrl)
-      const url = URL.createObjectURL(new Blob([vtt], { type: 'text/vtt' }))
-      lastUrl = url
-      art.option.subtitle.escape = false
-      art.subtitle.init({
-        ...art.option.subtitle,
-        url,
-        type: 'vtt',
-        onVttLoad: unescape,
-      })
+    const lifetime = createLifetime(art)
+    const render = createRenderer(art, lifetime, unescape)
+    let trees = []
+    function setTracks(selected) {
+      if (!lifetime.closed)
+        render(serializeTracks(selected))
     }
-
-    setTracks(trees)
-
-    return {
+    const result = {
       name: 'multipleSubtitles',
       tracks(names = []) {
-        return setTracks(names.map(name => trees.find(tree => tree.name === name)))
+        if (!lifetime.closed)
+          setTracks(names.map(name => trees.find(tree => tree.name === name)))
       },
       reset() {
-        return setTracks(trees)
+        setTracks(trees)
       },
     }
+    try {
+      if (lifetime.closed)
+        return result
+      const vtts = await Promise.all(subtitles.map(option => loadVtt(option, { getExt, srtToVtt, assToVtt }, lifetime)))
+      if (lifetime.closed)
+        return result
+      trees = parseTracks(vtts, subtitles)
+      setTracks(trees)
+      return result
+    }
+    catch (error) {
+      lifetime.dispose()
+      throw error
+    }
   }
 }

packages/artplayer-plugin-multiple-subtitles/src/lifetime.js

@@ -0,0 +1,48 @@
+export default function createLifetime(art) {
+  let closed = Boolean(art.isDestroy)
+  const cleanups = new Set()
+  let cancel
+  const cancelled = new Promise((resolve) => {
+    cancel = resolve
+  })
+  function run(cleanup) {
+    try {
+      cleanup()
+    }
+    catch (error) {
+      console.warn('Failed to clean up multiple subtitles:', error)
+    }
+  }
+  const lifetime = {
+    get closed() { return closed },
+    own(cleanup) {
+      if (closed)
+        run(cleanup)
+      else
+        cleanups.add(cleanup)
+      return () => cleanups.delete(cleanup)
+    },
+    wait(value) { return Promise.race([value, cancelled]) },
+    dispose() {
+      if (closed)
+        return
+      closed = true
+      cancel()
+      const pending = [...cleanups].reverse()
+      cleanups.clear()
+      for (const cleanup of pending)
+        run(cleanup)
+    },
+  }
+  if (!closed) {
+    lifetime.own(() => art.off('destroy', lifetime.dispose))
+    try {
+      art.on('destroy', lifetime.dispose)
+    }
+    catch (error) {
+      lifetime.dispose()
+      throw error
+    }
+  }
+  return lifetime
+}

packages/artplayer-plugin-multiple-subtitles/src/merge.js

@@ -0,0 +1,30 @@
+import { WebVTTParser, WebVTTSerializer } from './parser'
+
+export function parseTracks(vtts, subtitles) {
+  const parser = new WebVTTParser()
+  return vtts.map((vtt, index) => {
+    const tree = parser.parse(vtt, 'metadata')
+    tree.url = subtitles[index].url
+    tree.name = subtitles[index].name
+    return tree
+  })
+}
+
+export function serializeTracks(trees) {
+  const cues = []
+  for (const tree of trees) {
+    for (const cue of tree.cues) {
+      cues.push({
+        ...cue,
+        tree: {
+          ...cue.tree,
+          children: cue.tree.children.map(child => ({
+            ...child,
+            value: `<div class="art-subtitle-${tree.name}">${child.value}</div>`,
+          })),
+        },
+      })
+    }
+  }
+  return new WebVTTSerializer().serialize(cues)
+}

packages/artplayer-plugin-multiple-subtitles/src/render.js

@@ -0,0 +1,68 @@
+export default function createRenderer(art, lifetime, unescape) {
+  let current = null
+  function own(url) {
+    let freed = false
+    let release = () => {}
+    const entry = {
+      free() {
+        if (freed)
+          return
+        freed = true
+        release()
+        URL.revokeObjectURL(url)
+      },
+    }
+    release = lifetime.own(entry.free)
+    return entry
+  }
+  return (vtt) => {
+    if (lifetime.closed)
+      return
+    // Allocate before replacing the active URL so allocation failure preserves it.
+    const url = URL.createObjectURL(new Blob([vtt], { type: 'text/vtt' }))
+    const entry = own(url)
+    if (lifetime.closed)
+      return
+    const previous = current
+    let option
+    let escape
+    let configured = false
+    current = entry
+    try {
+      option = art.option.subtitle
+      escape = option.escape
+      if (lifetime.closed || current !== entry)
+        return
+      option.escape = false
+      configured = true
+      const config = { ...option, url, type: 'vtt', onVttLoad: unescape }
+      if (lifetime.closed || current !== entry)
+        return
+      const pending = art.subtitle.init(config)
+      // Selection stays void and registration does not await the host's media loading.
+      Promise.resolve(pending).catch((error) => {
+        if (current === entry) {
+          current = null
+          entry.free()
+        }
+        if (!lifetime.closed)
+          console.warn('Failed to initialize multiple subtitles:', error)
+      })
+    }
+    catch (error) {
+      if (current === entry) {
+        current = previous
+        if (configured && option.escape === false)
+          option.escape = escape
+      }
+      entry.free()
+      throw error
+    }
+    finally {
+      if (previous !== current)
+        previous?.free()
+      if (entry !== current)
+        entry.free()
+    }
+  }
+}

packages/artplayer-plugin-multiple-subtitles/src/request.js

@@ -0,0 +1,33 @@
+export default async function loadVtt(option, { getExt, srtToVtt, assToVtt }, lifetime) {
+  if (lifetime.closed)
+    return
+  const controller = typeof AbortController === 'function' ? new AbortController() : null
+  const release = lifetime.own(() => controller?.abort())
+  try {
+    const url = option.url
+    if (lifetime.closed)
+      return
+    const response = await lifetime.wait(controller ? fetch(url, { signal: controller.signal }) : fetch(url))
+    if (lifetime.closed)
+      return
+    if (response.ok === false)
+      throw new Error(`Failed to fetch multiple subtitles: HTTP ${response.status}`)
+    const buffer = await lifetime.wait(response.arrayBuffer())
+    if (lifetime.closed)
+      return
+    const text = new TextDecoder(option.encoding || 'utf-8').decode(buffer)
+    switch (option.type || getExt(option.url)) {
+      case 'srt': return srtToVtt(text)
+      case 'ass': return assToVtt(text)
+      case 'vtt': return text
+      default: return ''
+    }
+  }
+  catch (error) {
+    controller?.abort()
+    throw error
+  }
+  finally {
+    release()
+  }
+}