自定义表达式函数

由于表达式内的函数在前后端都可能执行，所以同一个表达式需要前后端同时定义

后端表达式自定义

package pro.shushi.pamirs.demo.core.fun;

import org.apache.commons.lang3.StringUtils;
import org.joda.time.DateTime;
import pro.shushi.pamirs.meta.annotation.Fun;
import pro.shushi.pamirs.meta.annotation.Function;
import pro.shushi.pamirs.meta.common.constants.NamespaceConstants;

import java.util.Date;
import java.util.List;

import static pro.shushi.pamirs.meta.enmu.FunctionCategoryEnum.TEXT;
import static pro.shushi.pamirs.meta.enmu.FunctionCategoryEnum.TIME;
import static pro.shushi.pamirs.meta.enmu.FunctionLanguageEnum.JAVA;
import static pro.shushi.pamirs.meta.enmu.FunctionOpenEnum.LOCAL;
import static pro.shushi.pamirs.meta.enmu.FunctionSceneEnum.EXPRESSION;

/**
 * 自定义函数
 */
@Fun(NamespaceConstants.expression)
public class DemoCustomFunctions {

    @Function.Advanced(
            displayName = "逗号分隔字符串数组", language = JAVA,
            builtin = true, category = TEXT
    )
    @Function.fun("MY_COMMA")
    @Function(name = "MY_COMMA", scene = {EXPRESSION}, openLevel = LOCAL,
            summary = "函数示例: MY_COMMA(list)\n函数说明: 将字符串数组转为逗号分隔的字符串"
    )
    public String myComma(List<String> list) {
        return StringUtils.join(list, ",");
    }

    @Function.Advanced(
            displayName = "根据出生算年龄", language = JAVA,
            builtin = true, category = TIME
    )
    @Function.fun("CALC_AGE")
    @Function(name = "CALC_AGE", scene = {EXPRESSION}, openLevel = LOCAL,
            summary = "函数示例: CALC_AGE(birthDate)\n函数说明: 根据出生算年龄"
    )
    public Integer calcAge(Date birthDate) {
        if (birthDate == null) {
            return 0;
        }
        return new DateTime().getYear() - new DateTime(birthDate).getYear();
    }
}

前端表达式定义

定义后导入到main.ts里，导入@kunlun/dependencies的代码之后

import { Expression } from '@kunlun/dependencies';
import dayjs from 'dayjs';

Expression.getInstance().registerFunction('MY_COMMA', ['array'], (list: string[]) => {
  return (list || [])
    .map((value) => {
      return `'${value}'`;
    })
    .join(',');
});

Expression.getInstance().registerFunction('CALC_AGE', ['string'], (birthDate: string) => {
  if (birthDate == null) {
    return 0;
  }
  return Math.ceil(dayjs().year() - dayjs(birthDate, 'YYYY-MM-DD HH:mm:ss').year());
});

界面设计器拖入年龄的非存储字段，属性面板的计算公式的函数中选择自定义的函数

注意：不能在时间类型字段的计算公式使用该函数，因为计算后的结果为数字类型，与原字段不一致

表格页可以看到根据发布时间计算的年龄，与预期一致