@imtf/rjsf-conditionals/lib/rulesRunner.js

Extension of @rjsf/core with conditional field support

import execute from "./actions";
import { cloneDeep } from "lodash";
import { deepEquals } from "@rjsf/utils";
function doRunRules(engine, formData, schema, uiSchema, extraActions = {}) {
  let schemaCopy = cloneDeep(schema);
  let uiSchemaCopy = cloneDeep(uiSchema);
  let formDataCopy = cloneDeep(formData);

  // Exclude undefined values as they are note valid facts
  const formDataSanitized = cloneDeep(formData);
  Object.keys(formDataSanitized).forEach(key => formDataSanitized[key] === undefined && delete formDataSanitized[key]);
  let res = engine.run(formDataSanitized).then(result => {
    let events;
    if (Array.isArray(result)) {
      events = result;
    } else if (typeof result === "object" && result.events && Array.isArray(result.events)) {
      events = result.events;
    } else {
      throw new Error("Unrecognized result from rules engine");
    }
    events.forEach(event => execute(event, schemaCopy, uiSchemaCopy, formDataCopy, extraActions));
  });
  return res.then(() => {
    return {
      schema: schemaCopy,
      uiSchema: uiSchemaCopy,
      formData: formDataCopy
    };
  });
}
export function normRules(rules) {
  return rules.sort(function (a, b) {
    if (a.order === undefined) {
      return b.order === undefined ? 0 : 1;
    }
    return b.order === undefined ? -1 : a.order - b.order;
  });
}
export default function rulesRunner(schema, uiSchema, rules, engine, extraActions) {
  engine = typeof engine === "function" ? new engine([], schema) : engine;
  normRules(rules).forEach(rule => engine.addRule(rule));
  return formData => {
    if (formData === undefined || formData === null) {
      return {
        schema,
        uiSchema,
        formData
      };
    }
    return doRunRules(engine, formData, schema, uiSchema, extraActions).then(conf => {
      if (deepEquals(conf.formData, formData)) {
        return conf;
      } else {
        return doRunRules(engine, conf.formData, schema, uiSchema, extraActions);
      }
    });
  };
}