@tabular-json/tabular-json/lib/tabular.js

Tabular-JSON: a superset of JSON with CSV-like tables

import { isObject } from './objects.js';
const leaf = Symbol();
export function isTabular(value) {
    return Array.isArray(value) && value.length > 0 && value.every(isObject);
}
export function collectFields(array) {
    const merged = {};
    array.forEach((item) => {
        if (isObject(item)) {
            _mergeObject(item, merged);
        }
        else {
            _mergeValue(item, merged);
        }
    });
    const paths = [];
    _collectPaths(merged, [], paths);
    return paths;
}
// internal function for collectNestedPaths
// mutates the argument `merged`
function _mergeObject(object, merged) {
    for (const key in object) {
        const value = object[key];
        const valueMerged = merged[key] || (merged[key] = (Array.isArray(value) ? [] : {}));
        if (isObject(value)) {
            _mergeObject(value, valueMerged);
        }
        else {
            _mergeValue(value, valueMerged);
        }
    }
}
// internal function for collectNestedPaths
// mutates the argument `merged`
function _mergeValue(value, merged) {
    if (merged[leaf] === undefined) {
        merged[leaf] = value === null || value === undefined ? null : true;
    }
}
// internal function for collectNestedPaths
// mutates the argument `paths`
function _collectPaths(merged, parentPath, paths) {
    if (merged[leaf] === true || (merged[leaf] === null && isEmpty(merged))) {
        paths.push(parentPath);
    }
    else if (Array.isArray(merged)) {
        merged.forEach((item, index) => _collectPaths(item, parentPath.concat(index), paths));
    }
    else if (isObject(merged)) {
        for (const key in merged) {
            _collectPaths(merged[key], parentPath.concat(key), paths);
        }
    }
}
function isEmpty(object) {
    return Object.keys(object).length === 0;
}
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