forked from cory/tildefriends
All of the changes that have been sitting on tildepi for ages. For posterity.
git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@3530 ed5197a5-7fde-0310-b194-c3ffbd925b24
This commit is contained in:
269
packages/cory/db/db.js
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269
packages/cory/db/db.js
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@ -0,0 +1,269 @@
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//! {"category": "libraries"}
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class DatabaseList {
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constructor(name) {
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this._name = name;
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}
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_getList() {
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let self = this;
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return database.get(this._name).then(function(node) {
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return JSON.parse(node);
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}).catch(function(error) {
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return self._emptyNode();
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});
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}
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_randomKey() {
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let kAlphabet = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
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let kBytes = 32;
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let result = "";
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for (let i = 0; i < kBytes; i++) {
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result += kAlphabet.charAt(Math.floor(Math.random() * kAlphabet.length));
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}
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return this._name + "_" + result;
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}
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_emptyNode() {
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return {next: null, previous: null};
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}
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_getNode() {
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var self = this;
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var key = self._randomKey();
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return database.get(key).then(function(found) {
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if (!found) {
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return key;
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} else {
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return self._getNode();
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}
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});
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}
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_getRelative(node, next, count) {
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}
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_insertEnd(item, after) {
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let self = this;
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return this._getList().then(function(listNode) {
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let readPromises = [self._getNode()];
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readPromises.push(listNode.previous ? database.get(listNode.previous).then(JSON.parse) : null);
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readPromises.push(listNode.next ? database.get(listNode.next).then(JSON.parse) : null);
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return Promise.all(readPromises).then(function(results) {
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let newNodeName = results[0];
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let previousNode = results[1];
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let nextNode = results[2];
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let newNode = self._emptyNode();
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let oldPrevious = listNode.previous;
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let oldNext = listNode.next;
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newNode.value = item;
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newNode.previous = listNode.previous || newNodeName;
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newNode.next = listNode.next || newNodeName;
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if (after) {
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listNode.previous = newNodeName;
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listNode.next = listNode.next || newNodeName;
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} else {
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listNode.next = newNodeName;
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listNode.previous = listNode.previous || newNodeName;
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}
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let writePromises = [
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database.set(self._name, JSON.stringify(listNode)),
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database.set(newNodeName, JSON.stringify(newNode)),
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];
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if (oldPrevious && oldPrevious == oldNext) {
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previousNode.next = newNodeName;
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previousNode.previous = newNodeName;
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writePromises.push(database.set(oldPrevious, JSON.stringify(previousNode)));
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} else {
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if (previousNode) {
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previousNode.next = newNodeName;
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writePromises.push(database.set(oldPrevious, JSON.stringify(previousNode)));
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}
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if (nextNode) {
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nextNode.previous = newNodeName;
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writePromises.push(database.set(oldNext, JSON.stringify(nextNode)));
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}
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}
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return Promise.all(writePromises);
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});
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});
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}
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_removeEnd(after) {
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let self = this;
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return this._getList().then(function(listNode) {
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if (listNode.next) {
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if (listNode.next == listNode.previous) {
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return database.get(listNode.next).then(JSON.parse).then(function(removedNode) {
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let removedName = listNode.next;
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listNode.next = null;
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listNode.previous = null;
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return Promise.all([
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database.remove(removedName),
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database.set(self._name, JSON.stringify(listNode)),
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]).then(function() {
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return removedNode.value;
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});
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});
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} else {
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let name1 = listNode.previous;
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let name2 = listNode.next;
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return Promise.all([
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database.get(listNode.previous),
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database.get(listNode.next),
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]).then(function(nodes) {
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var node1 = JSON.parse(nodes[0]);
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var node2 = JSON.parse(nodes[1]);
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if (after) {
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let name0 = node1.previous;
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return database.get(name0).then(JSON.parse).then(function(node0) {
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node0.next = name2;
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node2.previous = name0;
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listNode.previous = name0;
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return Promise.all([
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database.set(name0, JSON.stringify(node0)),
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database.remove(name1),
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database.set(name2, JSON.stringify(node2)),
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database.set(self._name, JSON.stringify(listNode)),
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])
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}).then(function() {
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return node1.value;
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});
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} else {
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let name3 = node2.next;
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return database.get(name3).then(JSON.parse).then(function(node3) {
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node1.next = name3;
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node3.previous = name1;
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listNode.next = name3;
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terminal.print(name1, " ", name2, " ", name3, " ", self._name);
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terminal.print(JSON.stringify(listNode));
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return Promise.all([
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database.set(name1, JSON.stringify(node1)),
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database.remove(name2),
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database.set(name3, JSON.stringify(node3)),
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database.set(self._name, JSON.stringify(listNode)),
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])
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}).then(function() {
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return node2.value;
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});
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}
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});
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}
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}
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});
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}
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push(item) {
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return this._insertEnd(item, true);
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}
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pop() {
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return this._removeEnd(true);
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}
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shift() {
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return this._removeEnd(false);
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}
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unshift(item) {
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return this._insertEnd(item, false);
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}
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_sliceInternal(head, count, next, end, result) {
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let self = this;
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if (head[next] == end && count > 0) {
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result.push(head.value);
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return new Promise(function(resolve, reject) { resolve(result); });
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} else {
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if (count > 0) {
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return database.get(head[next]).then(JSON.parse).then(function(retrieved) {
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return self._sliceInternal(retrieved, count - 1, next, end, result).then(function(result) {
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result.push(head.value);
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return result;
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});
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});
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} else {
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return new Promise(function(resolve, reject) { resolve(result); });
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}
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}
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}
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get(count) {
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let self = this;
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return self._getList().then(function(listNode) {
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if (listNode.next) {
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return database.get(count > 0 ? listNode.next : listNode.previous).then(JSON.parse).then(function(head) {
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if (head) {
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return self._sliceInternal(
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head,
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Math.abs(count),
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count > 0 ? "next" : "previous",
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count > 0 ? listNode.next : listNode.previous,
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[]).then(function(result) {
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result.reverse();
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return result;
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});
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} else {
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return null;
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}
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});
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}
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});
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}
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}
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function wipeDatabase() {
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let promises = [];
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return database.getAll().then(function(list) {
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for (let i = 0; i < list.length; i++) {
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promises.push(database.remove(list[i]));
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}
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});
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return Promise.all(promises);
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}
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function dumpDatabase() {
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return database.getAll().then(function(list) {
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let promises = [];
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for (let i = 0; i < list.length; i++) {
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promises.push(database.get(list[i]));
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}
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return Promise.all(promises).then(function(values) {
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for (let i = 0; i < list.length; i++) {
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terminal.print(list[i], " ", values[i]);
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}
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});
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}).catch(function(error) {
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terminal.print(error);
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});
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}
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if (imports.terminal) {
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x = new DatabaseList("list");
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core.register("onInput", function(input) {
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if (input == "clear") {
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wipeDatabase().then(function() {
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terminal.print("Database is now empty.");
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});
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} else if (input.substring(0, "push ".length) == "push ") {
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x.push(input.substring("push ".length)).then(dumpDatabase).catch(terminal.print);
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} else if (input.substring(0, "unshift ".length) == "unshift ") {
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x.unshift(input.substring("unshift ".length)).then(dumpDatabase).catch(terminal.print);
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} else if (input == "pop") {
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x.pop().then(function(out) {
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terminal.print("POPPED: ", out);
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}).then(dumpDatabase).catch(terminal.print);
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} else if (input == "shift") {
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x.shift().then(function(out) {
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terminal.print("SHIFTED: ", out);
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}).then(dumpDatabase).catch(terminal.print);
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} else if (input.substring(0, "get ".length) == "get ") {
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let parts = input.split(" ");
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x.get(parseInt(parts[1])).then(function(result) {
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terminal.print(JSON.stringify(result))
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}).catch(terminal.print);
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} else {
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dumpDatabase();
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}
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});
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}
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