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formula-calculator

v0.2.41

Published

A formula calculator

Downloads

23

Readme

公式计算插件,没有任何依赖

Powered By 轻流

  1. 重新生成代码 antlr4 -Dlanguage=JavaScript -no-listener -visitor Formula.g4

使用方法

  1. npm install formula-calculator --save

  2. 需要使用的地方引入

import formula from 'formula-calculator';

  1. 调用计算方法

console.log(formula.calculate('SUM(1,2,3)'));

  1. 本地调试

npm run calc "sum(1, 2)"

  1. 如果有其他需要,可以提交issue

支持的公式类型

  • IF
  • CONCAT
  • LEFT
  • RIGHT
  • REPLACE
  • MID
  • TEXT
  • NUM
  • RMBUPPER
  • SUM
  • SUMIF
  • AVERAGE
  • COUNT
  • COUNTIF
  • MIN
  • MAX
  • ROUND
  • ROUNDUP
  • ROUNDDOWN
  • INT
  • MOD
  • PRODUCT
  • SUMPRODUCT
  • POWER
  • YEAR
  • MONTH
  • DAY
  • HOUR
  • MINUTE
  • SECOND
  • DATE
  • CURDATE
  • NOW
  • RDID
  • UPPER
  • LOWER
  • AND
  • OR
  • NOT
  • XOR
  • ISEMPTY
  • SEARCH
  • LEN
  • DAYS
  • DATEDELTA
  • REGTEST
  • LN
  • IFS
  • BASE64
  • SQRT
  • DATETOTIMESTAMP
  • TIMESTAMPTODATE
  • UNICODEENCODE
  • UNICODEDECODE

公式的具体用法,可参考轻流公式使用说明

规则

  1. 字符串要用双引号包裹
  2. 字符串中如果需要包含双引号,进入公式前需要把 \ 替换成 \,再把 " 替换成"。公式计算出的结果,会自动去掉转义

错误码说明

抛出的错误结构为

参数类型错误:

{
  "errCode": 1,  // 错误码
  "funcName": "SUM",  // 发生错误方法/操作符名称
  "paramIdx": 1,  // 错误参数索引,从1开始
}

参数个数错误

{
  "errCode": 2,
  "funcName": "SUM",  // 参数个数错误方法名称
  "expectNum": 2,  // 正确情况下参数个数
  "actualNum": 3,  // 实际参数个数
}

错误码说明

  • 1: 参数类型错误
  • 2: 参数个数错误
  • 3: 计算出的结果不正确