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{ type Disposable, ResourceTracker } from \"../disposable.js\";\r\nimport {\r\n type LasciiErrorContext,\r\n type LasciiErrorType,\r\n logLasciiError,\r\n toError,\r\n} from \"../errors.js\";\r\nimport { LasciiEmitter } from \"../events.js\";\r\nimport {\r\n beginAccessibleTransition,\r\n endAccessibleTransition,\r\n ensureLiveRegion,\r\n prefersReducedMotion,\r\n} from \"../a11y.js\";\r\n\r\nexport type {\r\n LasciiCompleteDetail,\r\n LasciiErrorDetail,\r\n LasciiProgressDetail,\r\n LasciiStartDetail,\r\n} from \"../events.js\";\r\nexport { LasciiEvent } from \"../events.js\";\r\n\r\nexport type RevealOriginValue = \"start\" | \"middle\";\r\n\r\nexport interface LasciiTextEffectOptions {\r\n introChars?: string;\r\n introPhaseFrames?: number;\r\n chars?: string;\r\n frameStartMax?: number;\r\n frameEndMax?: number;\r\n randomCharChance?: number;\r\n phraseDelay?: number;\r\n separator?: string;\r\n revealOrigin?: RevealOriginValue;\r\n reducedMotion?: boolean;\r\n}\r\n\r\nexport interface LasciiTextEffectDefaults\r\n extends Required> {}\r\n\r\ninterface QueueItem {\r\n from: string;\r\n to: string;\r\n start: number;\r\n end: number;\r\n char: string;\r\n}\r\n\r\nclass LasciiTextEffect extends LasciiEmitter implements Disposable {\r\n static RevealOrigin = Object.freeze({\r\n START: \"start\",\r\n MIDDLE: \"middle\",\r\n }) as Readonly<{\r\n readonly START: \"start\";\r\n readonly MIDDLE: \"middle\";\r\n }>;\r\n\r\n static DEFAULTS: LasciiTextEffectDefaults = {\r\n introChars: \"█▓▒░x92\",\r\n introPhaseFrames: 10,\r\n chars: \"!<>-_\\\\/[]{}—=+*^?#________\",\r\n frameStartMax: 40,\r\n frameEndMax: 40,\r\n randomCharChance: 0.28,\r\n phraseDelay: 800,\r\n separator: \"|:|\",\r\n revealOrigin: LasciiTextEffect.RevealOrigin.START,\r\n };\r\n\r\n el: HTMLElement;\r\n config: LasciiTextEffectDefaults;\r\n queue: QueueItem[];\r\n frame: number;\r\n frameRequest: number | null;\r\n resolve: (() => void) | null;\r\n safetyTimeout: ReturnType | null;\r\n phraseTimeout: ReturnType | null;\r\n rawText: string;\r\n phrases: string[];\r\n shouldLoop: boolean;\r\n counter: number;\r\n failed: boolean;\r\n private readonly tracker = new ResourceTracker();\r\n private readonly reduceMotion: boolean;\r\n\r\n constructor(element: HTMLElement, options: LasciiTextEffectOptions = {}) {\r\n super();\r\n this.el = element;\r\n this.config = { ...LasciiTextEffect.DEFAULTS, ...options };\r\n this.queue = [];\r\n this.frame = 0;\r\n this.frameRequest = null;\r\n this.resolve = null;\r\n this.safetyTimeout = null;\r\n this.phraseTimeout = null;\r\n this.rawText = (this.el.textContent ?? \"\").trim();\r\n this.phrases = [];\r\n this.shouldLoop = false;\r\n this.counter = 0;\r\n this.failed = false;\r\n this.reduceMotion = prefersReducedMotion(options.reducedMotion);\r\n\r\n this.tracker.track(() => {\r\n this.stopActiveWork();\r\n endAccessibleTransition(this.el);\r\n });\r\n\r\n try {\r\n this.phrases = this.extractPhrases();\r\n this.shouldLoop = this.rawText.includes(this.config.separator);\r\n this.clearInitialText();\r\n } catch (error) {\r\n this.handleError(\"text_effect_initialization_failed\", error);\r\n return;\r\n }\r\n\r\n queueMicrotask(() => {\r\n if (this.failed || this.tracker.isDisposed) return;\r\n try {\r\n this.start();\r\n } catch (error) {\r\n this.handleError(\"text_effect_initialization_failed\", error);\r\n }\r\n });\r\n }\r\n\r\n get disposed(): boolean {\r\n return this.tracker.isDisposed;\r\n }\r\n\r\n dispose(): void {\r\n if (this.tracker.isDisposed) return;\r\n this.failed = true;\r\n this.tracker.dispose();\r\n }\r\n\r\n private ensureNotDisposed(): void {\r\n if (this.tracker.isDisposed) {\r\n throw new Error(\"LasciiTextEffect has been disposed\");\r\n }\r\n }\r\n\r\n private handleError(\r\n type: LasciiErrorType | string,\r\n error: unknown,\r\n context: LasciiErrorContext = {},\r\n ): void {\r\n if (this.failed || this.tracker.isDisposed) return;\r\n this.failed = true;\r\n const err = toError(error);\r\n logLasciiError(type, err, {\r\n element: this.el,\r\n config: this.config,\r\n ...context,\r\n });\r\n this.stopActiveWork();\r\n this.fallbackToOriginal();\r\n endAccessibleTransition(this.el);\r\n this.emit(\"error\", { error: err });\r\n }\r\n\r\n private stopActiveWork(): void {\r\n if (this.frameRequest !== null) {\r\n cancelAnimationFrame(this.frameRequest);\r\n this.frameRequest = null;\r\n }\r\n if (this.safetyTimeout !== null) {\r\n clearTimeout(this.safetyTimeout);\r\n this.safetyTimeout = null;\r\n }\r\n if (this.phraseTimeout !== null) {\r\n clearTimeout(this.phraseTimeout);\r\n this.phraseTimeout = null;\r\n }\r\n this.resolve?.();\r\n this.resolve = null;\r\n }\r\n\r\n private fallbackToOriginal(): void {\r\n const fallbackText = this.phrases[0] ?? this.rawText;\r\n this.el.textContent = fallbackText;\r\n }\r\n\r\n extractPhrases(): string[] {\r\n return this.rawText\r\n .split(this.config.separator)\r\n .map((text) => text.trim())\r\n .filter(Boolean);\r\n }\r\n\r\n clearInitialText(): void {\r\n this.el.textContent = \"\";\r\n }\r\n\r\n start(): void {\r\n this.ensureNotDisposed();\r\n if (this.failed || !this.phrases.length) return;\r\n if (this.shouldLoop) {\r\n this.displayNextPhrase();\r\n } else {\r\n this.setText(this.phrases[0]);\r\n }\r\n }\r\n\r\n displayNextPhrase(): void {\r\n if (this.failed || this.tracker.isDisposed) return;\r\n const currentPhrase = this.phrases[this.counter];\r\n this.setText(currentPhrase).then(() => {\r\n if (this.failed || this.tracker.isDisposed) return;\r\n this.phraseTimeout = setTimeout(() => {\r\n this.phraseTimeout = null;\r\n if (this.failed || this.tracker.isDisposed) return;\r\n this.updateCounter();\r\n this.displayNextPhrase();\r\n }, this.config.phraseDelay);\r\n });\r\n }\r\n\r\n updateCounter(): void {\r\n this.counter = (this.counter + 1) % this.phrases.length;\r\n }\r\n\r\n setText(newText: string): Promise {\r\n this.ensureNotDisposed();\r\n if (this.failed) {\r\n return Promise.resolve();\r\n }\r\n\r\n try {\r\n const oldText = this.el.innerText;\r\n const length = Math.max(oldText.length, newText.length);\r\n const promise = new Promise((resolve) => {\r\n this.resolve = resolve;\r\n });\r\n this.queue = this.buildQueue(oldText, newText, length);\r\n ensureLiveRegion(this.el);\r\n this.emit(\"start\", { text: newText });\r\n this.emit(\"progress\", { progress: 0 });\r\n if (this.reduceMotion) {\r\n this.completeAnimation(newText);\r\n return Promise.resolve();\r\n }\r\n beginAccessibleTransition(this.el, newText);\r\n this.resetAnimation();\r\n\r\n this.safetyTimeout = setTimeout(() => {\r\n this.safetyTimeout = null;\r\n if (this.frameRequest) {\r\n cancelAnimationFrame(this.frameRequest);\r\n this.frameRequest = null;\r\n this.completeAnimation(newText);\r\n }\r\n }, 3000);\r\n\r\n return promise;\r\n } catch (error) {\r\n this.handleError(\"text_effect_animation_failed\", error, { newText });\r\n return Promise.resolve();\r\n }\r\n }\r\n\r\n buildQueue(oldText: string, newText: string, length: number): QueueItem[] {\r\n const queue: QueueItem[] = [];\r\n const origin =\r\n this.config.revealOrigin ?? LasciiTextEffect.RevealOrigin.START;\r\n const cap = this.config.frameStartMax;\r\n const scrambleLen = Math.max(\r\n 1,\r\n Math.floor(Math.random() * this.config.frameEndMax),\r\n );\r\n\r\n for (let i = 0; i < length; i++) {\r\n const from = oldText[i] || \"\";\r\n const to = newText[i] || \"\";\r\n let start = 0;\r\n\r\n if (origin === LasciiTextEffect.RevealOrigin.MIDDLE) {\r\n const mid = (length - 1) / 2;\r\n const dist = Math.abs(i - mid);\r\n const maxDist = Math.max(mid, length - 1 - mid) || 1;\r\n start = Math.floor((dist / maxDist) * cap);\r\n } else if (length > 1) {\r\n start = Math.floor((i / (length - 1)) * cap);\r\n }\r\n\r\n const end = start + scrambleLen;\r\n queue.push({ from, to, start, end, char: \"\" });\r\n }\r\n return queue;\r\n }\r\n\r\n resetAnimation(): void {\r\n if (this.frameRequest !== null) {\r\n cancelAnimationFrame(this.frameRequest);\r\n this.frameRequest = null;\r\n }\r\n this.frame = 0;\r\n this.update();\r\n }\r\n\r\n update = (): void => {\r\n if (this.failed || this.tracker.isDisposed) return;\r\n\r\n try {\r\n let output = \"\";\r\n let complete = 0;\r\n for (let i = 0; i < this.queue.length; i++) {\r\n const item = this.queue[i];\r\n const { from, to, start, end } = item;\r\n let char = item.char;\r\n if (this.frame >= end) {\r\n complete++;\r\n output += to;\r\n } else if (this.frame >= start) {\r\n const local = this.frame - start;\r\n const intro = this.config.introChars ?? \"\";\r\n const introPhase = this.config.introPhaseFrames ?? 10;\r\n if (intro.length && local < introPhase) {\r\n const last = intro.length - 1;\r\n const idx =\r\n last <= 0\r\n ? 0\r\n : Math.min(\r\n last,\r\n Math.floor((local / Math.max(introPhase - 1, 1)) * last),\r\n );\r\n char = intro[idx];\r\n this.queue[i].char = char;\r\n } else if (!char || Math.random() < this.config.randomCharChance) {\r\n char = this.randomChar();\r\n this.queue[i].char = char;\r\n }\r\n output += `${char}`;\r\n } else {\r\n output += from;\r\n }\r\n }\r\n this.el.innerHTML = output;\r\n const progress =\r\n this.queue.length === 0 ? 1 : complete / this.queue.length;\r\n this.emit(\"progress\", { progress });\r\n if (complete === this.queue.length) {\r\n this.completeAnimation(this.queue.map((item) => item.to).join(\"\"));\r\n } else {\r\n this.frameRequest = requestAnimationFrame(this.update);\r\n this.frame++;\r\n }\r\n } catch (error) {\r\n this.handleError(\"text_effect_animation_failed\", error);\r\n }\r\n };\r\n\r\n randomChar(): string {\r\n return this.config.chars[\r\n Math.floor(Math.random() * this.config.chars.length)\r\n ];\r\n }\r\n\r\n private completeAnimation(text: string): void {\r\n if (this.failed || this.tracker.isDisposed) {\r\n this.resolve?.();\r\n this.resolve = null;\r\n return;\r\n }\r\n this.el.textContent = text;\r\n endAccessibleTransition(this.el);\r\n if (this.safetyTimeout !== null) {\r\n clearTimeout(this.safetyTimeout);\r\n this.safetyTimeout = null;\r\n }\r\n this.emit(\"progress\", { progress: 1 });\r\n this.emit(\"complete\", { text });\r\n this.resolve?.();\r\n this.resolve = null;\r\n }\r\n\r\n static init(selector = \"[data-lascii-text]\"): LasciiTextEffect[] {\r\n const elements = document.querySelectorAll(selector);\r\n return Array.from(\r\n elements,\r\n (element) => new LasciiTextEffect(element as HTMLElement),\r\n );\r\n }\r\n}\r\n\r\nexport default LasciiTextEffect;\r\n"]}