An itsy-bitsy database for the browser. useful for web apps and other toy projects.

ldb.js

/* =============================
================================

	 /$$       /$$ /$$
	| $$      | $$| $$
	| $$  /$$$$$$$| $$$$$$$
	| $$ /$$__  $$| $$__  $$
	| $$| $$  | $$| $$  \ $$
	| $$| $$  | $$| $$  | $$
	| $$|  $$$$$$$| $$$$$$$/
	|__/ \_______/|_______/

 An itsy-bitsy database for the
 browser, useful for web apps and
 other sorts of toy projects.
 
================================
============================== */

'use strict';

const ldb = {

	// Utils
	_uuid: () => {
		return ([1e7] + -1e3 + -4e3 + -8e3 + -1e11)
			.replace(/[018]/g, c =>
				(c ^ crypto.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4).toString(16));
	},
	_makeDocument: (document, dateCreated = null) => {
		const rightNow = new Date();
		let editedDate = null;
		if (dateCreated === null) {
			dateCreated = rightNow.toISOString();
		} else {
			dateCreated = dateCreated;
			editedDate = rightNow.toISOString();
		}
		const newDoc = {
			"created": dateCreated,
			"edited": editedDate,
			"doc": document
		};
		return newDoc;
	},
	_table: () => {
		const dump = JSON.parse(localStorage.getItem('ldb'));
		console.log('Number of rows: ' + Object.keys(dump).length);
		console.table(dump);
		return null;
	},
	_destroy: (confirm) => {
		if (confirm === true) {
			localStorage.removeItem('ldb');
		} else {
			console.error('You must confirm this action.');
		}
	},

	// GET
	Get: (idToGet) => {
		let returnData = null;
		if (idToGet) {
			const data = JSON.parse(localStorage.getItem('ldb'));
			returnData = data[idToGet];
			if (returnData === undefined) {
				console.error('Unable to find record with id "' + idToGet + '"');
				returnData = null;
			}
		} else {
			if (localStorage.getItem('ldb') === null) {
				const defaultData = {};
				localStorage.setItem('ldb', JSON.stringify(defaultData));
			}
			returnData = JSON.parse(localStorage.getItem('ldb'));
		}
		return returnData;
	},

	// PUT
	Put: (newDocumentData) => {
		if (typeof newDocumentData === 'object') {
			let pagesData = ldb.Get();
			const uuid = ldb._uuid();
			const row = ldb._makeDocument(newDocumentData);
			Object.assign(pagesData, {
				[uuid]: row
			});
			const preFlight = JSON.stringify(pagesData);
			localStorage.setItem('ldb', preFlight);
		} else {
			console.error('Data must be an object.');
			console.log('Data is ' + typeof newDocumentData);
			console.log(newDocumentData);
		}
	},

	// UPDATE
	Update: (idToModify, newDocumentData = null) => {
		let pagesData = ldb.Get();
		let targetRow = pagesData[idToModify];
		const updatedRow = ldb._makeDocument(newDocumentData, targetRow.created);
		Object.assign(pagesData, {
			[idToModify]: updatedRow
		});
		const preFlight = JSON.stringify(pagesData);
		localStorage.setItem('ldb', preFlight);
	},

	// DELETE
	Delete: (idToRemove) => {
		// TODO: UNTESTED!
		let pagesData = ldb.Get();
		let targetRow = pagesData[idToRemove];
		Object.assign(pagesData, {
			[idToRemove]: null
		}); // FIXME: this will leave an empty ID
		const preFlight = JSON.stringify(pagesData);
		localStorage.setItem('ldb', preFlight);
	},

	// EXPORT
	Export: () => {
		const rightNow = new Date();
		const pagesData = JSON.stringify(ldb.Get());
		const dataUri = 'data:application/json;charset=utf-8,' + encodeURIComponent(pagesData);
		const exportFileDefaultName = rightNow.toISOString() + '--ldb_export.json';
		let linkElement = document.createElement('a');
		linkElement.setAttribute('href', dataUri);
		linkElement.setAttribute('download', exportFileDefaultName);
		linkElement.click();
	}

};