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abcf568 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 | export function nextTypeDelay(target: string, currentLength: number, streamRate: number) {
const nextChar = target[currentLength] ?? ''
const backlog = target.length - currentLength
const targetCharsPerSecond = resolveTypingCharsPerSecond(backlog, streamRate)
if (!nextChar) {
return 18
}
if (nextChar === '\n') {
return 1000 / Math.max(targetCharsPerSecond * 1.4, 1)
}
if (/[，。！？；：,.!?;:]/.test(nextChar)) {
return Math.max(24, 1000 / Math.max(targetCharsPerSecond * 0.55, 1))
}
if (/\s/.test(nextChar)) {
return Math.max(10, 1000 / Math.max(targetCharsPerSecond * 1.25, 1))
}
return Math.max(12, 1000 / Math.max(targetCharsPerSecond, 1))
}
export function nextTypeStep(backlog: number) {
if (backlog >= 28) {
return 3
}
if (backlog >= 16) {
return 2
}
return 1
}
function resolveTypingCharsPerSecond(backlog: number, streamRate: number) {
const minCharsPerSecond = 10
const maxCharsPerSecond = 26
const adaptiveBase = streamRate > 0 ? streamRate * 0.55 + 6 : minCharsPerSecond
if (backlog >= 10) {
return clamp(adaptiveBase, 12, maxCharsPerSecond)
}
return clamp(adaptiveBase, minCharsPerSecond, 18)
}
function clamp(value: number, min: number, max: number) {
return Math.min(max, Math.max(min, value))
}
export function shouldRedirectKeyToInput(event: KeyboardEvent): boolean {
return event.key.length === 1 || event.key === 'Backspace'
}
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