enigma-bbs/core/menu_stack.js

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