Create ID lookup cache for manifest

chrox · chrox · commit d5286aeccf4c · 2025-06-08T20:49:58.000+08:00
diff --git a/epub.js b/epub.js
@@ -681,7 +681,10 @@ class Resources {
         this.cfis = CFI.fromElements($$itemref)
     }
     getItemByID(id) {
-        return this.manifest.find(item => item.id === id)
+        if (!this.manifestById) {
+            this.manifestById = new Map(this.manifest.map(item => [item.id, item]))
+        }
+        return this.manifestById.get(id)
     }
     getItemByHref(href) {
         return this.manifest.find(item => item.href === href)

Original file line number	Diff line number	Diff line change
`@@ -681,7 +681,10 @@ class Resources {`
`681`	`681`	`this.cfis = CFI.fromElements($$itemref)`
`682`	`682`	`}`
`683`	`683`	`getItemByID(id) {`
`684`		`- return this.manifest.find(item => item.id === id)`
	`684`	`+ if (!this.manifestById) {`
	`685`	`+ this.manifestById = new Map(this.manifest.map(item => [item.id, item]))`
	`686`	`+ }`
	`687`	`+ return this.manifestById.get(id)`
`685`	`688`	`}`
`686`	`689`	`getItemByHref(href) {`
`687`	`690`	`return this.manifest.find(item => item.href === href)`