54 lines
1.9 KiB
TypeScript
54 lines
1.9 KiB
TypeScript
/**
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* 小数输入：保留用户输入形态，不强制补尾零；precision 表示最多小数位数。
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*/
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/** 输入清洗：仅保留数字与小数点，截断到 maxPrecision 位小数 */
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export function sanitizeDecimalInput(value: string, maxPrecision = 4): string {
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if (!value) return ''
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let cleaned = value.replace(/,/g, '').replace(/[^0-9.-]/g, '')
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const isNegative = cleaned.startsWith('-')
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if (isNegative) cleaned = cleaned.slice(1).replace(/-/g, '')
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cleaned = cleaned.replace(/[^0-9.]/g, '')
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if (maxPrecision <= 0) {
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return (isNegative ? '-' : '') + cleaned.replace(/\./g, '')
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}
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const dotIndex = cleaned.indexOf('.')
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if (dotIndex !== -1) {
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const intPart = cleaned.slice(0, dotIndex + 1)
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const decPart = cleaned.slice(dotIndex + 1).replace(/\./g, '')
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cleaned = intPart + decPart.slice(0, maxPrecision)
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}
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return (isNegative ? '-' : '') + cleaned
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}
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/** 外部数值同步到输入框：去掉无意义的尾零，不补零 */
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export function formatDecimalDisplayNatural(
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value: number | null | undefined,
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maxPrecision = 4
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): string {
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if (value === null || value === undefined) return ''
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if (Number.isNaN(value)) return ''
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if (maxPrecision <= 0) return String(Math.trunc(value))
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const factor = Math.pow(10, maxPrecision)
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const rounded = Math.round(value * factor) / factor
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return String(rounded)
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}
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/** 解析为 number；空串 / 仅符号或点 → undefined */
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export function parseDecimalToNumber(
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value: string,
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maxPrecision = 4
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): number | undefined {
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const sanitized = sanitizeDecimalInput(value, maxPrecision)
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if (!sanitized || sanitized === '.' || sanitized === '-' || sanitized === '-.') {
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return undefined
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}
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const num = Number(sanitized)
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if (Number.isNaN(num)) return undefined
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if (maxPrecision <= 0) return Math.trunc(num)
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const factor = Math.pow(10, maxPrecision)
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return Math.round(num * factor) / factor
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}
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