74 lines
2.5 KiB
TypeScript
74 lines
2.5 KiB
TypeScript
/**
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* 金额格式化工具模块
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* 提供千分位分隔、输入清洗、展示格式化、数值解析等功能
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*/
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/** 字符串分段拼接千分位，禁止使用前瞻正则 */
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export function addThousandSeparators(intStr: string): string {
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if (!intStr) return ''
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const isNegative = intStr.startsWith('-')
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const absStr = isNegative ? intStr.slice(1) : intStr
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const parts: string[] = []
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const len = absStr.length
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for (let i = len; i > 0; i -= 3) {
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const start = Math.max(0, i - 3)
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parts.unshift(absStr.slice(start, i))
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}
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const result = parts.join(',')
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return isNegative ? `-${result}` : result
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}
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/** 输入清洗：去逗号、仅保留数字与一个点、截断小数位 */
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export function sanitizeMoneyInput(value: string, precision = 2): string {
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if (!value) return ''
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// 去逗号
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let cleaned = value.replace(/,/g, '')
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// 去非数字非点字符
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cleaned = cleaned.replace(/[^0-9.]/g, '')
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// 只保留第一个小数点
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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
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}
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// 截断小数到 precision 位
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if (dotIndex !== -1) {
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const dotIdx = cleaned.indexOf('.')
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const intPart = cleaned.slice(0, dotIdx + 1)
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let decPart = cleaned.slice(dotIdx + 1)
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if (decPart.length > precision) {
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decPart = decPart.slice(0, precision)
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}
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cleaned = intPart + decPart
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}
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return cleaned
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}
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/** 展示：整数部分千分位 + 最多 precision 位小数 */
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export function formatMoneyDisplay(
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value: string | number | null | undefined,
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precision = 2
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): string {
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if (value === null || value === undefined || value === '') return '0.00'
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const num = typeof value === 'string' ? parseFloat(value) : value
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if (isNaN(num)) return '0.00'
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const isNegative = num < 0
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const absNum = Math.abs(num)
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const fixed = absNum.toFixed(precision)
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const [intStr, decStr] = fixed.split('.')
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const formatted = addThousandSeparators(intStr)
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const result = `${formatted}.${decStr}`
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return isNegative ? `-${result}` : result
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}
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/** 提交：number | null；空串 / 仅 '.' → null */
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export function parseMoneyToNumber(value: string, precision = 2): number | null {
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const sanitized = sanitizeMoneyInput(value, precision)
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if (!sanitized || sanitized === '.') return null
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const num = Number(sanitized)
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if (isNaN(num)) return null
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const factor = Math.pow(10, precision)
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return Math.round(num * factor) / factor
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}
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