2016-04-18 18:03:18 -04:00
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var EventEmitter = require('events');
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var util = require('util');
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2016-04-18 17:20:30 -04:00
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/**
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* A simple runtime for blocks.
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*/
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function Runtime () {
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2016-04-18 18:03:18 -04:00
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// Bind event emitter
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2016-04-26 09:49:52 -04:00
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EventEmitter.call(this);
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2016-04-18 17:20:30 -04:00
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// State
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this.blocks = {};
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this.stacks = [];
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}
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2016-04-18 18:03:18 -04:00
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/**
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* Inherit from EventEmitter
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*/
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util.inherits(Runtime, EventEmitter);
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2016-04-26 09:49:52 -04:00
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Runtime.prototype.createBlock = function (block) {
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// Create new block
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this.blocks[block.id] = block;
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// Walk each field and add any shadow blocks
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// @todo Expand this to cover vertical / nested blocks
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for (var i in block.fields) {
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var shadows = block.fields[i].blocks;
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for (var y in shadows) {
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var shadow = shadows[y];
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this.blocks[shadow.id] = shadow;
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2016-04-26 09:54:14 -04:00
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}
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}
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2016-04-18 17:20:30 -04:00
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// Push block id to stacks array. New blocks are always a stack even if only
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// momentary. If the new block is added to an existing stack this stack will
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// be removed by the `moveBlock` method below.
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2016-04-26 09:49:52 -04:00
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this.stacks.push(block.id);
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};
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Runtime.prototype.changeBlock = function (args) {
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// Validate
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if (args.element !== 'field') return;
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if (typeof this.blocks[args.id] === 'undefined') return;
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if (typeof this.blocks[args.id].fields[args.name] === 'undefined') return;
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// Update block value
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this.blocks[args.id].fields[args.name].value = args.value;
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2016-04-18 17:20:30 -04:00
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};
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Runtime.prototype.moveBlock = function (e) {
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var _this = this;
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// Block has a new parent
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if (e.oldParent === undefined && e.newParent !== undefined) {
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// Remove stack
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_this._deleteStack(e.id);
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// Update new parent
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if (e.newField === undefined) {
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_this.blocks[e.newParent].next = e.id;
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} else {
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_this.blocks[e.newParent].fields[e.newField] = {
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name: e.newField,
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value: e.id,
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blocks: {}
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};
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2016-04-18 17:20:30 -04:00
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}
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}
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// Block was removed from parent
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if (e.newParentId === undefined && e.oldParent !== undefined) {
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// Add stack
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_this.stacks.push(e.id);
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// Update old parent
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if (e.oldField === undefined) {
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_this.blocks[e.oldParent].next = null;
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} else {
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delete _this.blocks[e.oldParent].fields[e.oldField];
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}
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}
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};
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Runtime.prototype.deleteBlock = function (e) {
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// @todo Stop threads running on this stack
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// Get block
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var block = this.blocks[e.id];
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// Delete children
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if (block.next !== null) {
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this.deleteBlock({id: block.next});
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}
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2016-04-26 09:49:52 -04:00
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// Delete substacks and fields
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for (var field in block.fields) {
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if (field === 'SUBSTACK') {
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this.deleteBlock({id: block.fields[field].value});
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} else {
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for (var shadow in block.fields[field].blocks) {
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this.deleteBlock({id: shadow});
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}
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}
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2016-04-18 17:20:30 -04:00
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}
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// Delete stack
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this._deleteStack(e.id);
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// Delete block
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delete this.blocks[e.id];
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};
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// -----------------------------------------------------------------------------
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// -----------------------------------------------------------------------------
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Runtime.prototype._deleteStack = function (id) {
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var i = this.stacks.indexOf(id);
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if (i > -1) this.stacks.splice(i, 1);
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};
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Runtime.prototype._getNextBlock = function (id) {
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if (typeof this.blocks[id] === 'undefined') return null;
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return this.blocks[id].next;
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};
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Runtime.prototype._getSubstack = function (id) {
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if (typeof this.blocks[id] === 'undefined') return null;
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return this.blocks[id].fields['SUBSTACK'];
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2016-04-18 17:20:30 -04:00
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};
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module.exports = Runtime;
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