excel-remastered/lib/jsonToCsv/getHeaders.js

Enhances readability of complex nested JSON data while converting to CSV

"use strict";
var __assign = (this && this.__assign) || function () {
    __assign = Object.assign || function(t) {
        for (var s, i = 1, n = arguments.length; i < n; i++) {
            s = arguments[i];
            for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
                t[p] = s[p];
        }
        return t;
    };
    return __assign.apply(this, arguments);
};
Object.defineProperty(exports, "__esModule", { value: true });
function flattenAttributes(jsonObject, parentKey, separator) {
    if (parentKey === void 0) { parentKey = ''; }
    if (separator === void 0) { separator = '.'; }
    var attributes = {};
    var _loop_1 = function (key) {
        if (jsonObject.hasOwnProperty(key)) {
            var fullKey_1 = parentKey ? "".concat(parentKey).concat(separator).concat(key) : key;
            if (Array.isArray(jsonObject[key])) {
                jsonObject[key].forEach(function (item, index) {
                    if (typeof item === 'object' && item !== null) {
                        attributes = __assign(__assign({}, attributes), flattenAttributes(item, "".concat(fullKey_1, "[").concat(index, "]"), separator));
                    }
                    else {
                        attributes["".concat(fullKey_1, "[").concat(index, "]")] = null;
                    }
                });
            }
            else if (typeof jsonObject[key] === 'object' &&
                jsonObject[key] !== null) {
                attributes = __assign(__assign({}, attributes), flattenAttributes(jsonObject[key], fullKey_1, separator));
            }
            else {
                attributes[fullKey_1] = null;
            }
        }
    };
    for (var key in jsonObject) {
        _loop_1(key);
    }
    return attributes;
}
function modifyAttributes(attributes) {
    var modifiedAttributes = {};
    for (var key in attributes) {
        var modifiedKey = key.substring(key.indexOf('.') + 1); // Remove everything before the first "." [for attributes of type 10.name.firstname]
        var finalKey = modifiedKey.replace(/\[\d+\]/g, ''); // Remove all occurrences of "[n]"
        modifiedAttributes[finalKey] = attributes[key];
    }
    return modifiedAttributes;
}
function arrangeHeaders(attributes) {
    var csvArray = [];
    var levels = {};
    Object.keys(attributes).forEach(function (attribute) {
        var parts = attribute.split('.');
        var currentLevel = levels;
        parts.forEach(function (part, index) {
            if (!currentLevel[part]) {
                currentLevel[part] = {};
            }
            currentLevel = currentLevel[part];
            if (!csvArray[index]) {
                csvArray[index] = [];
            }
            var parentIndex = csvArray[index - 1]
                ? csvArray[index - 1].indexOf(parts[index - 1])
                : -1;
            var currentIndex = csvArray[index].length;
            while (currentIndex < parentIndex) {
                csvArray[index].push('');
                currentIndex++;
            }
            csvArray[index].push(part);
        });
    });
    return csvArray;
}
function removeDuplicatesInSubArrays(csvArray) {
    var uniqueValuesFirstSubArray = new Set();
    var _loop_2 = function (i) {
        var uniqueValues = new Set();
        csvArray[i].forEach(function (element, j) {
            // Check for duplicates within the sub-array fragment and reset if necessary
            if (element !== '' && csvArray[i - 1][j] !== '') {
                if (uniqueValues.has(element)) {
                    csvArray[i][j] = '';
                }
                else {
                    uniqueValues.add(element);
                }
            }
        });
    };
    // Process subsequent sub-arrays
    for (var i = 1; i < csvArray.length; i++) {
        _loop_2(i);
    }
    // Process the first sub-array
    csvArray[0].forEach(function (element, j) {
        if (j > 0) {
            if (uniqueValuesFirstSubArray.has(element)) {
                csvArray[0][j] = '';
            }
            else {
                uniqueValuesFirstSubArray.add(element);
            }
        }
    });
}
function getHeaders(jsonObject) {
    var flattenedAttributes = flattenAttributes(jsonObject); // extract all attributes from the json object
    var headers = modifyAttributes(flattenedAttributes); // get all unique headers as an array
    var csvHeadersArray = arrangeHeaders(headers); // arrange them in the required formatting for csv
    removeDuplicatesInSubArrays(csvHeadersArray);
    // Extract keys from the headers object
    var headersArray = Object.keys(headers);
    return { csvHeadersArray: csvHeadersArray, headers: headersArray };
}
exports.default = getHeaders;