153 lines
3.2 KiB
JavaScript
153 lines
3.2 KiB
JavaScript
/* jslint node: true */
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'use strict';
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// ENiGMA½
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var loadMenu = require('./menu_util.js').loadMenu;
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var acsUtil = require('./acs_util.js');
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var _ = require('lodash');
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var assert = require('assert');
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module.exports = MenuStack;
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function MenuStack(client) {
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this.client = client;
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this.stack = [];
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var self = this;
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this.push = function(moduleInfo) {
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return self.stack.push(moduleInfo);
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};
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this.pop = function() {
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return self.stack.pop();
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};
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this.peekPrev = function() {
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if(this.stackSize() > 1) {
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return self.stack[self.stack.length - 2];
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}
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};
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this.top = function() {
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if(self.stackSize() > 0) {
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return self.stack[self.stack.length - 1];
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}
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};
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this.stackSize = function() {
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return self.stack.length;
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};
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}
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MenuStack.prototype.next = function(cb) {
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var currentModuleInfo = this.top();
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assert(currentModuleInfo, 'Empty menu stack!');
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var menuConfig = currentModuleInfo.instance.menuConfig;
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var next;
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if(_.isArray(menuConfig.next)) {
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next = acsUtil.getConditionalValue(this.client, menuConfig.next, 'next');
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if(!next) {
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cb(new Error('No matching condition for \'next\'!'));
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return;
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}
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} else if(_.isString(menuConfig.next)) {
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next = menuConfig.next;
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} else {
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cb(new Error('Invalid or missing \'next\' member in menu config!'));
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return;
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}
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if(next === currentModuleInfo.name) {
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cb(new Error('Menu config \'next\' specifies current menu!'));
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return;
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}
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this.goto(next, { }, cb);
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};
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MenuStack.prototype.prev = function(cb) {
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this.pop().instance.leave(); // leave & remove current
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var previousModuleInfo = this.pop(); // get previous
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if(previousModuleInfo) {
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this.goto(previousModuleInfo.name, { extraArgs : previousModuleInfo.extraArgs, savedState : previousModuleInfo.savedState }, cb);
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} else {
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cb(new Error('No previous menu available!'));
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}
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};
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MenuStack.prototype.goto = function(name, options, cb) {
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var currentModuleInfo = this.top();
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if(!cb && _.isFunction(options)) {
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cb = options;
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}
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var self = this;
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if(currentModuleInfo && name === currentModuleInfo.name) {
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if(cb) {
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cb(new Error('Already at supplied menu!'));
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}
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return;
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}
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var loadOpts = {
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name : name,
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client : self.client,
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};
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if(options) {
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loadOpts.extraArgs = options.extraArgs;
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}
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loadMenu(loadOpts, function menuLoaded(err, modInst) {
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if(err) {
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var errCb = cb || self.client.defaultHandlerMissingMod();
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errCb(err);
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} else {
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// :TODO: Move this log to caller
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self.client.log.debug( { menuName : name }, 'Goto menu module');
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if(currentModuleInfo) {
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// save stack state
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currentModuleInfo.savedState = currentModuleInfo.instance.getSaveState();
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currentModuleInfo.instance.leave();
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}
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self.push({
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name : name,
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instance : modInst,
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extraArgs : loadOpts.extraArgs,
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});
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// restore previous state if requested
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if(options && options.savedState) {
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modInst.restoreSavedState(options.savedState);
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}
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modInst.enter(self.client);
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self.client.log.trace(
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{ stack : _.map(self.stack, function(si) { return si.name; } ) },
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'Updated menu stack');
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if(cb) {
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cb(null);
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}
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}
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});
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};
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MenuStack.prototype.getCurrentModule = function() {
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var top = this.top();
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if(top) {
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return top.instance;
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}
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};
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