Creates a JSON string based on headers

Json From Headers.EXCEL.yaml

name: Json From Headers
description: Creates a JSON string based on headers
host: EXCEL
api_set: {}
script:
  content: |-
    /**
     * Evaluate a range of values and calculate a JSON string using headers as parents
     * @customfunction
     * @param {string[][]} fieldsRange
     * @param {string[][]} valuesRange
     * @returns JSON String.
     */
    function rangeJSONTest(fieldsRange, valuesRange) {
      const parents = fieldsRange.reverse();
      
      /**
       * Simple object check.
       * @param item
       * @returns {boolean}
       */
      const isObject = (item) => {
        return (item && typeof item === 'object' && !Array.isArray(item));
      }

      /**
       * Deep merge two objects.
       * @param target
       * @param ...sources
       */
      const mergeDeep = (target, ...sources) => {
        if (!sources.length) return target;
        const source = sources.shift();

        if (isObject(target) && isObject(source)) {
          for (const key in source) {
            if (isObject(source[key])) {
              if (!target[key]) Object.assign(target, { [key]: {} });
              mergeDeep(target[key], source[key]);
            } else {
              Object.assign(target, { [key]: source[key] });
            }
          }
        }
        return mergeDeep(target, ...sources);
      }

      /*
      Look for parent object
      */
      const lookUpForParent = (row, fields, index) => {
        if ((index < 0) || row > fields.length) {
          return;
        }
        if ((row === 0) && (fields[row][index] == "")) {
          return lookUpForParent(row + 1, fields, index);
        }
        if ((fields[row][index] == "") && (index >= 0)) {
          return lookUpForParent(row, fields, index - 1);
        }
        return fields[row][index]
      }
      /*
      Look for Preperty Name
      */
      const lookUpForName = (row, fields, index, value) => {
        const item = {};
        const result = {};
        if ((index < 0) || row > fields.length) {
          return;
        }
        if ((row === 0) && (fields[row][index] == "")) {
          return lookUpForName(row + 1, fields, index, value);
        }
        if ((fields[row][index] == "") && (index >= 0)) {
          return lookUpForName(row, fields, index - 1, value);
        }
        item[fields[row][index]] = value;

        if (row + 1 <= fields.length) {
          const parent = lookUpForParent(row + 1, fields, index);
          result[parent] = Object.assign({}, item);
        }

        return result
      }
      
      /*
      Iterate Objects and headers
      */
      const findParents = (parents, index, value) => {
        let actualRow = 0;
        let actualPos = index;
        if (!isNaN(value)) {
          var x = value;
          var y: number = +x;
          value = y;
        }
        let fieldName = lookUpForName(actualRow, parents, actualPos, value);
        return fieldName;
      };
     
      let globalResult = {};
      let values = valuesRange[0];
      for (let _i = 0; _i < values.length; _i++) {
        let value = values[_i];
        if (value != "") {
          const X = Object.assign({}, findParents(fieldsRange, _i, value));
          globalResult = mergeDeep(globalResult, X);
        }
      }
      return JSON.stringify(globalResult);
    }
  language: typescript
libraries: |
  https://appsforoffice.microsoft.com/lib/1/hosted/office.js
  @types/office-js
  [email protected]/client/core.min.js