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@eli-oat

eli-oat/ldb.js

Created Feb 7, 2020
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An itsy-bitsy database for the browser. useful for web apps and other toy projects.
/* =============================
================================
/$$ /$$ /$$
| $$ | $$| $$
| $$ /$$$$$$$| $$$$$$$
| $$ /$$__ $$| $$__ $$
| $$| $$ | $$| $$ \ $$
| $$| $$ | $$| $$ | $$
| $$| $$$$$$$| $$$$$$$/
|__/ \_______/|_______/
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();
}
};
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