@talend/react-forms/lib-esm/UIForm/utils/condition.js

React forms library based on json schema form.

/* eslint-disable @typescript-eslint/no-use-before-define */
import jsonLogic from 'json-logic-js';
function lowercase(a) {
  return a.toLowerCase();
}
function toNumber(a) {
  if (typeof a === 'number') {
    return a;
  } else if (typeof a === 'string') {
    return parseInt(a, 10);
  }
  throw new TypeError(`${a.toString()} is not a number`);
}
jsonLogic.add_operation('lowercase', lowercase);
jsonLogic.add_operation('toNumber', toNumber);

/**
 * If in the path [] appears it will be populated
 * with current key indices value.
 */
function replaceArrayNotationByIndexes(path, key) {
  if (!path || !path.includes('[]')) {
    return path;
  }
  return path.split(/\.|\[/).map((part, index) => {
    if (part === ']') {
      return key[index];
    }
    return part;
  }).join('.');
}

/**
 * For all "var" condition, populate generic indices ([]) from key indices.
 */
function resolveConditionVar(item, key) {
  if (!item || typeof item !== 'object') {
    return item;
  } else if (item.var) {
    if (item.var.includes('[]')) {
      return {
        ...item,
        var: replaceArrayNotationByIndexes(item.var, key)
      };
    }
    return item;
  } else if (Array.isArray(item)) {
    return item.map(it => resolveArrayNotation(it, key));
  }
  return resolveArrayNotation(item, key);
}

/**
 * Ensure generic indices ([]) are populated from the key.
 * It is a recursive implementation to support any kind of condition.
 */
function resolveArrayNotation(condition, key) {
  if (typeof condition !== 'object') {
    return condition;
  }
  const acc = {};
  Object.keys(condition).forEach(attribute => {
    const value = condition[attribute];
    if (Array.isArray(value)) {
      acc[attribute] = value.map(it => resolveConditionVar(it, key));
    } else {
      acc[attribute] = resolveConditionVar(value, key);
    }
    return acc;
  });
  return acc;
}

/**
 *
 * @example {
 *		'===': [{ var: 'my.path.title' }, 'Hello world'],
 * }
 *
 * @param properties source of the value provider to evaluate conditions.
 * @param condition array of conditions to evaluate.
 * @param key the widget schema key.
 * @returns true if the conditions are met, false otherwise.
 */
function shouldRender(condition, properties, key) {
  if (condition === undefined) {
    return true;
  }
  const runtimeCondition = resolveArrayNotation(condition, key);
  return jsonLogic.apply(runtimeCondition, properties);
}
export default shouldRender;
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