226 lines
8.1 KiB
JavaScript
226 lines
8.1 KiB
JavaScript
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/**
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* 将列索引 (0, 1, 2...) 转换为字母 (A, B, C...)
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*/
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export const indexToColName = (index) => {
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let label = ''
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let i = index
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while (i >= 0) {
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label = String.fromCharCode(65 + (i % 26)) + label
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i = Math.floor(i / 26) - 1
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}
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return label
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}
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/**
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* 将坐标 (A1) 解析为 {r, c}
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*/
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export const parseCellCoord = (coord) => {
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const match = coord.match(/^([A-Z]+)([0-9]+)$/)
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if (!match) return null
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const colStr = match[1]
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const rowStr = match[2]
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let c = 0
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for (let i = 0; i < colStr.length; i++) {
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c = c * 26 + (colStr.charCodeAt(i) - 64)
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}
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return { r: parseInt(rowStr) - 1, c: c - 1 }
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}
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/**
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* 函数注册表：包含实现逻辑、描述和语法提示
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* 用于公式计算和 UI 提示
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*/
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export const FUNCTION_REGISTRY = {
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// --- 数学与统计 ---
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SUM: {
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description: '计算单元格区域中所有数值的和',
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syntax: 'SUM(number1, [number2], ...)',
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impl: (...args) => {
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return args.flat(Infinity).reduce((a, b) => {
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const num = Number(b)
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return isNaN(num) ? a : a + num
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}, 0)
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}
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},
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AVERAGE: {
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description: '返回参数的平均值（算术平均值）',
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syntax: 'AVERAGE(number1, [number2], ...)',
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impl: (...args) => {
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const nums = args.flat(Infinity).map(Number).filter(n => !isNaN(n))
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if (nums.length === 0) return 0
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return nums.reduce((a, b) => a + b, 0) / nums.length
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}
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},
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MAX: {
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description: '返回一组值中的最大值',
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syntax: 'MAX(number1, [number2], ...)',
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impl: (...args) => {
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const nums = args.flat(Infinity).map(Number).filter(n => !isNaN(n))
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return nums.length ? Math.max(...nums) : 0
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}
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},
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MIN: {
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description: '返回一组值中的最小值',
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syntax: 'MIN(number1, [number2], ...)',
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impl: (...args) => {
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const nums = args.flat(Infinity).map(Number).filter(n => !isNaN(n))
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return nums.length ? Math.min(...nums) : 0
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}
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},
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COUNT: {
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description: '计算区域中包含数字的单元格个数',
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syntax: 'COUNT(value1, [value2], ...)',
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impl: (...args) => {
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return args.flat(Infinity).filter(v => typeof v === 'number' || (typeof v === 'string' && !isNaN(Number(v)) && v.trim() !== '')).length
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}
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},
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ROUND: {
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description: '将数字四舍五入到指定的位数',
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syntax: 'ROUND(number, num_digits)',
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impl: (number, digits = 0) => {
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const n = Number(number)
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const d = Number(digits)
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if (isNaN(n) || isNaN(d)) return '#VALUE!'
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return Math.round(n * (10 ** d)) / (10 ** d)
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}
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},
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ABS: {
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description: '返回数字的绝对值',
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syntax: 'ABS(number)',
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impl: (number) => Math.abs(Number(number))
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},
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// --- 逻辑 ---
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IF: {
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description: '判断是否满足某个条件，如果满足返回一个值，如果不满足返回另一个值',
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syntax: 'IF(logical_test, value_if_true, [value_if_false])',
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impl: (condition, trueVal, falseVal) => {
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return condition ? trueVal : (falseVal === undefined ? false : falseVal)
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}
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},
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AND: {
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description: '如果所有参数都为 TRUE，则返回 TRUE',
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syntax: 'AND(logical1, [logical2], ...)',
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impl: (...args) => args.flat(Infinity).every(Boolean)
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},
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OR: {
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description: '如果任一参数为 TRUE，则返回 TRUE',
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syntax: 'OR(logical1, [logical2], ...)',
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impl: (...args) => args.flat(Infinity).some(Boolean)
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},
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// --- 文本 ---
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CONCAT: {
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description: '将两个或多个文本字符串联接为一个字符串',
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syntax: 'CONCAT(text1, [text2], ...)',
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impl: (...args) => args.flat(Infinity).join('')
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},
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LEN: {
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description: '返回文本字符串中的字符个数',
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syntax: 'LEN(text)',
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impl: (text) => String(text || '').length
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},
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TRIM: {
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description: '移除文本中多余的空格',
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syntax: 'TRIM(text)',
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impl: (text) => String(text || '').trim()
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},
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UPPER: {
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description: '将文本转换为大写',
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syntax: 'UPPER(text)',
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impl: (text) => String(text || '').toUpperCase()
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},
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LOWER: {
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description: '将文本转换为小写',
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syntax: 'LOWER(text)',
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impl: (text) => String(text || '').toLowerCase()
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},
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// --- 日期与时间 ---
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NOW: {
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description: '返回当前日期和时间',
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syntax: 'NOW()',
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impl: () => new Date().toLocaleString()
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},
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TODAY: {
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description: '返回当前日期',
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syntax: 'TODAY()',
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impl: () => new Date().toLocaleDateString()
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}
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}
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/**
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* 简易公式求值器
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* @param {String} formula 公式字符串 (e.g. "=SUM(A1:B2) + 10")
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* @param {Function} getValueCb 回调函数，用于获取指定单元格的值 (r, c) => val
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*/
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export const evaluateFormula = (formula, getValueCb) => {
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if (!formula || typeof formula !== 'string' || !formula.startsWith('=')) return formula
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const expression = formula.substring(1).trim()
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if (!expression) return ''
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// 1. 预处理范围引用：将 A1:B2 转换为数值数组 [1, 2, 3, 4]
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// 注意：为了支持文本函数，如果单元格内容是文本，也需要正确提取
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const rangeRegex = /([A-Z]+[0-9]+):([A-Z]+[0-9]+)/g
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const parsedExpressionWithRanges = expression.replace(rangeRegex, (match, start, end) => {
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const s = parseCellCoord(start)
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const e = parseCellCoord(end)
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if (!s || !e) return match
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const values = []
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const minR = Math.min(s.r, e.r), maxR = Math.max(s.r, e.r)
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const minC = Math.min(s.c, e.c), maxC = Math.max(s.c, e.c)
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for(let r=minR; r<=maxR; r++) {
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for(let c=minC; c<=maxC; c++) {
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let val = getValueCb(r, c)
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// 尝试转为数字，如果不仅是数字字符则保留原值（用于文本处理）
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const numVal = Number(val)
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if (!isNaN(numVal) && val !== '') {
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values.push(numVal)
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} else {
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// 简单的转义处理，防止字符串破坏数组结构
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values.push(`"${String(val).replace(/"/g, '\\"')}"`)
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}
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}
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}
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return `[${values.join(',')}]`
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})
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// 2. 预处理单个单元格引用：将 A1 转换为具体值
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// 复杂的正则用于避免匹配到已经是字符串中的内容，这里做简化处理
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// 我们假设单元格引用不会出现在引号内部（这是一个简易引擎的限制）
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const cellRegex = /(?<!["'[a-zA-Z0-9_])([A-Z]+[0-9]+)(?!["'[a-zA-Z0-9_])/g
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const finalExpression = parsedExpressionWithRanges.replace(cellRegex, (match) => {
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const coords = parseCellCoord(match)
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if (!coords) return 0
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const val = getValueCb(coords.r, coords.c)
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const numVal = Number(val)
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// 如果是纯数字，返回数字；否则返回带引号的字符串
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return (!isNaN(numVal) && val !== '') ? numVal : `"${String(val).replace(/"/g, '\\"')}"`
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})
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// 3. 构建执行上下文
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// 将 FUNCTION_REGISTRY 中的 impl 提取出来作为参数传递给 Function 构造器
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const funcNames = Object.keys(FUNCTION_REGISTRY)
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const funcImpls = funcNames.map(name => FUNCTION_REGISTRY[name].impl)
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try {
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// 注入所有支持的函数到执行作用域
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// e.g. new Function('SUM', 'AVERAGE', ..., 'return SUM(1, 2)')
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const func = new Function(...funcNames, `return ${finalExpression}`)
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const result = func(...funcImpls)
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// 如果结果是 NaN 或 Infinity，做一些友好的处理
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if (typeof result === 'number' && isNaN(result)) return '#VALUE!'
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if (typeof result === 'number' && !isFinite(result)) return '#DIV/0!'
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return result
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} catch (e) {
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console.warn(`Formula Eval Error: ${formula}`, e)
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return '#ERROR!'
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}
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}
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