mirror of
https://github.com/flynx/ImageGrid.git
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696 lines
18 KiB
JavaScript
Executable File
696 lines
18 KiB
JavaScript
Executable File
/**********************************************************************
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*
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*
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*
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**********************************************************************/
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define(function(require){ var module = {}
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//var DEBUG = DEBUG != null ? DEBUG : true
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var args2array = require('lib/util').args2array
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var actions = require('lib/actions')
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var object = require('lib/object')
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/*********************************************************************/
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//
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// Feature attributes:
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// .tag - feature tag (string)
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// this is used to identify the feature, its event handlers
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// and DOM elements.
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//
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// .title - feature name (string | null)
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// .doc - feature description (string | null)
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//
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// .priority - feature priority
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// can be:
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// - 'high' (99) | 'medium' (0) | 'low' (-99)
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// - number
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// - null (0, default)
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// features with higher priority will be setup first,
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// features with the same priority will be run in order of
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// occurrence.
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// .suggested - list of optional suggested features, these are not
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// required but setup if available.
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// This is useful for defining meta features but without
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// making each sub-feature a strict dependency.
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// .depends - feature dependencies -- tags of features that must setup
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// before the feature (list | null)
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// .exclusive - feature exclusivity tags (list | null)
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// an exclusivity group enforces that only one feature in
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// it will be run, i.e. the first / highest priority.
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//
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// .actions - action object containing feature actions (ActionSet | null)
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// this will be mixed into the base object on .setup()
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// and mixed out on .remove()
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// .config - feature configuration, will be merged with base
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// object's .config
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// NOTE: the final .config is an empty object with
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// .__proto__ set to the merged configuration
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// data...
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// .handlers - feature event handlers (list | null)
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//
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//
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//
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// .handlers format:
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// [
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// [ <event-spec>, <handler-function> ],
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// ...
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// ]
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//
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// NOTE: both <event-spec> and <handler-function> must be compatible with
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// Action.on(..)
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//
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//
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// Feature applicability:
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// If feature.isApplicable(..) returns false then the feature will not be
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// considered on setup...
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//
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//
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// XXX this could install the handlers in two locations:
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// - mixin if available...
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// - base object (currently implemented)
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// should the first be done?
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var FeatureProto =
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module.FeatureProto = {
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tag: null,
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isApplicable: function(actions){
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return true
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},
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getPriority: function(){
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var res = this.priority || 0
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return res == 'high' ? 99
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: res == 'low' ? -99
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: res == 'medium' ? 0
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: res
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},
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setup: function(actions){
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var that = this
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// mixin actions...
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if(this.actions != null){
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actions.mixin(this.actions)
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}
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// install handlers...
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if(this.handlers != null){
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this.handlers.forEach(function(h){
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actions.on(h[0], that.tag, h[1])
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})
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}
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// merge config...
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// NOTE: this will merge the actual config in .config.__proto__
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// keeping the .config clean for the user to lay with...
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if(this.config != null
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|| (this.actions != null
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&& this.actions.config != null)){
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var config = this.config = this.config || this.actions.config
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if(actions.config == null){
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actions.config = Object.create({})
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}
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Object.keys(config).forEach(function(n){
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// NOTE: this will overwrite existing values...
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actions.config.__proto__[n] = config[n]
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})
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}
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// custom setup...
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// XXX is this the correct way???
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if(this.hasOwnProperty('setup') && this.setup !== FeatureProto.setup){
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this.setup(actions)
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}
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return this
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},
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remove: function(actions){
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if(this.actions != null){
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actions.mixout(this.actions)
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}
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if(this.handlers != null){
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actions.off('*', this.tag)
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}
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if(this.hasOwnProperty('remove') && this.setup !== FeatureProto.remove){
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this.remove(actions)
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}
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// remove feature DOM elements...
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actions.ribbons.viewer.find('.' + this.tag).remove()
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return this
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},
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}
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// XXX is hard-coded default feature-set a good way to go???
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//
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// Feature(obj)
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// -> feature
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//
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// Feature(feature-set, obj)
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// -> feature
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//
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// Feature(tag, obj)
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// -> feature
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//
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//
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// Feature(tag, actions)
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// -> feature
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//
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// Feature(feature-set, tag, actions)
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// -> feature
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//
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var Feature =
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module.Feature =
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function Feature(feature_set, tag, obj){
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if(arguments.length == 2){
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// Feature(<tag>, <obj>)
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if(typeof(feature_set) == typeof('str')){
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obj = tag
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tag = feature_set
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feature_set = Features
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// Feature(<feature-set>, <obj>)
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} else {
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obj = tag
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tag = null
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}
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// Feature(<obj>)
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} else if(arguments.length == 1){
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obj = feature_set
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feature_set = Features
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}
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if(tag != null && obj.tag != null && obj.tag != tag){
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throw 'Error: tag and obj.tag mismatch, either use one or both must match.'
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}
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// action...
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if(obj instanceof actions.Action){
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if(tag == null){
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throw 'Error: need a tag to make a feature out of an action'
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}
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var f = {
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tag: tag,
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actions: obj,
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}
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obj = f
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// meta-feature...
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} else if(obj.constructor === Array){
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if(tag == null){
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throw 'Error: need a tag to make a meta-feature'
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}
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var f = {
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tag: tag,
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suggested: obj,
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}
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obj = f
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// feature...
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} else {
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obj.__proto__ = FeatureProto
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}
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if(feature_set){
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feature_set[obj.tag] = obj
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}
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return obj
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}
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Feature.prototype = FeatureProto
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Feature.prototype.constructor = Feature
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var FeatureSetProto = {
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__feature__: Feature,
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__actions__: actions.Actions,
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// if true, .setup(..) will report things it's doing...
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__verbose__: null,
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// List of registered features...
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get features(){
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var that = this
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return Object.keys(this)
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.filter(function(e){
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return e != 'features'
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&& that[e] instanceof Feature })
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},
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// Build list of features...
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//
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// Build list of all features for an empty object...
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// .buildFeatureList()
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// .buildFeatureList({})
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// .buildFeatureList({}, '*')
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// -> data
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//
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// Build a list of features for a specific root feature and object...
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// .buildFeatureList(object, feature)
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// -> data
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//
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// Build a list of features for a specific set of root features and object...
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// .buildFeatureList(object, [feature, ..])
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// -> data
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// NOTE: to disable a feature and all of it's dependants prefix
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// it's tag with '-' in the list.
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// e.g. including 'some-feature' will include the feature
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// and its dependants while '-some-feature' will remove
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// it and it's dependants.
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//
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//
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// This will build from user input a loadable list of features taking
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// into account feature dependencies, priorities and suggestions.
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//
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// Roughly this is done in this order starting with the given features:
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// - include all dependencies (recursively)
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// - include all suggested features (recursively)
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// - sort features by priority
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// - sort features by dependency
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// - check for feature applicability
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// - remove non-applicable features and all dependants (recursively)
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// - remove disabled features and all dependants (recursively)
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// - check and resolve exclusivity conflicts (XXX needs revision)
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// - check for missing features and dependencies
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//
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//
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// Return format:
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// {
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// // list of input features...
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// input: [ .. ],
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//
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// // features in correct load order...
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// features: [ .. ],
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//
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// // features disabled explicitly and their dependants...
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// disabled: [ .. ],
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// // unapplicable features and their dependants...
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// unapplicable: [ .. ],
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//
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// // features removed due to exclusivity conflict...
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// excluded: [ .. ],
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//
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// missing: {
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// // features explicitly given by user but missing...
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// USER: [ .. ],
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// // missing <feature> dependencies...
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// <feature>: [ .. ],
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// ...
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// },
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// conflicts: {
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// XXX
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// },
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// }
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//
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//
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// NOTE: obj (action set) here is used only for applicability testing...
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// NOTE: some feature applicability checks (.isApplicable(..)) may
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// require a real action set, thus for correct operation one
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// should be provided.
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// NOTE: all feature sorting is done maintaining relative feature order
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// when possible...
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// NOTE: meta-features are not included in the list as they do not
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// need to be setup.
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// ...this is because they are not Feature objects.
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//
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// XXX should meta-features be MetaFeature objects???
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// XXX not sure about handling excluded features (see inside)...
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// XXX add dependency loops to .conflicts...
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buildFeatureList: function(obj, lst){
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var that = this
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obj = obj || {}
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lst = (lst == null || lst == '*') ? this.features : lst
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lst = lst.constructor !== Array ? [lst] : lst
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var input = lst.slice()
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var disabled = []
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var excluded = []
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var unapplicable = []
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var missing = {}
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var conflicts = {}
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// reverse dependency cache...
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var dependants = {}
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// build dependency list...
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var _buildDepList = function(n, seen){
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seen = seen || []
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return seen.indexOf(n) >= 0 ? []
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: seen.push(n) && dependants[n] ? []
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.concat.apply(
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dependants[n],
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dependants[n]
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.map(function(n){ return _buildDepList(n, seen) }))
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: []
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}
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// missing stage 1: check if all user included features exist...
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// NOTE: we'll ignore missing disabled features too...
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lst.forEach(function(n){
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if(!that[n] && n[0] != '-'){
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var m = missing['USER'] = missing['USER'] || []
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m.push(n)
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}
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})
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// include all dependencies...
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//
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// NOTE: this should never fall into an infinite loop as we do
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// not include feature already seen...
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// ...unless there is an infinite number of features, but
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// I'll try to avoid that big a feature creep.
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// XXX should we check for dependency loops here???
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for(var i=0; i < lst.length; i++){
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var k = lst[i]
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// skip disabled or missing features....
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if(k[0] == '-' || !that[k]){
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continue
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}
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var deps = that[k].depends || []
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var refs = that[k].suggested || []
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deps.forEach(function(n){
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// expand lst with dependencies....
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lst.indexOf(n) < 0 && lst.push(n)
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// build reverse dependency index...
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var d = dependants[n] = dependants[n] || []
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d.indexOf(k) < 0 && d.push(k)
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})
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// expand lst with suggenstions....
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refs.forEach(function(n){
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lst.indexOf(n) < 0 && lst.push(n)
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})
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}
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// sort features by priority or position...
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lst = lst
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// remove undefined and non-features...
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.filter(function(n){
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// feature disabled -> record and skip...
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if(n[0] == '-'){
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disabled.push(n.slice(1))
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return false
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}
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var f = that[n]
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// feature not defined or is not a feature...
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if(f == null || !(f instanceof Feature)){
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return false
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}
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// check applicability...
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if(f.isApplicable && !f.isApplicable.call(that, obj)){
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unapplicable.push(n)
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return false
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}
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return true
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})
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// remove disabled...
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.filter(function(e){ return disabled.indexOf(e) < 0 })
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// build the sort table: [ <priority>, <index>, <elem> ]
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.map(function(e, i){ return [ that[e].getPriority(), i, e ] })
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// do the sort...
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// NOTE: JS compares lists as strings so we have to compare
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// the list manually...
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.sort(function(a, b){ return a[0] - b[0] || a[1] - b[1] })
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// cleanup -- drop the sort table...
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.map(function(e){ return e[2] })
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// remove dependants on not applicable and on disabled...
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var _unapplicable = unapplicable.slice()
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var _disabled = disabled.slice()
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// build the full lists of features to remove...
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_unapplicable
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.forEach(function(n){ _unapplicable = _unapplicable.concat(_buildDepList(n)) })
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_disabled
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.forEach(function(n){ _disabled = _disabled.concat(_buildDepList(n)) })
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// clear...
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// NOTE: in case of intersection disabled has priority...
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lst = lst
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.filter(function(n){
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return _disabled.indexOf(n) >= 0 ?
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disabled.push(n) && false
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: _unapplicable.indexOf(n) >= 0 ?
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unapplicable.push(n) && false
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: true })
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// missing stage 2: dependencies...
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lst.forEach(function(k){
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(that[k].depends || []).forEach(function(d){
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// NOTE: we do not need to check disabled or unapplicable
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// here as if the feature depended on dropped feature
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// it would have been already dropped too...
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if(!that[k]){
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var m = missing[k] = missing[k] || []
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m.push(d)
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}
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})
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})
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// check exclusive -> excluded...
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//
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// NOTE: this is the right spot for this, just after priority
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// sorting and clearing but before dependency sorting.
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//
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// XXX do we need to clear dependencies pulled by excluded features???
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// ways to go:
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// - drop excluded and continue (current state)
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// - disable excluded, add to original input and rebuild
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// - err and let the user decide
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var _exclusive = []
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lst = lst.filter(function(n){
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var e = that[n]
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// keep non-exclusive stuff...
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if(!e || e.exclusive == null){
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return true
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}
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// count the number of exclusive features already present...
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var res = e.exclusive
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.filter(function(n){
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if(_exclusive.indexOf(n) < 0){
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_exclusive.push(n)
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return false
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}
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return true
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})
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.length == 0
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!res
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&& excluded.push(n)
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// warn the user...
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// XXX not sure if this is the right place for this...
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&& console.warn(
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'Excluding unaplicable:', n, '(reccomended to exclude manually)')
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return res
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})
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// sort by dependency...
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var l = lst.length
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// get maximum possible length...
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// ...the worst case length appears to be (for full reversal):
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// S(2*(n-1) + 1)
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// S = n => n > 0 ? 2*(n-1)+1 + S(n-1) : 0
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// S = n => n > 0 ? 2*n-1 + S(n-1) : 0
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//
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// 2 * S(n) - n
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// S = n => n > 0 ? n + S(n-1) : 0
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// f = n => 2 * S(n) - n
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//
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// N^2 + C
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// S = n => n * n
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//
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// NOTE: this is the brute force way to check if we have a
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// dependency loop, need something faster...
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//
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// XXX is O(n^2) good enough worst case here?
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// ...at this point I think it is acceptable as we'll not
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// expect dependency graphs too saturated, and the average
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// complexity is far better...
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var max = l * l
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for(var i=0; i < lst.length; i++){
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var k = lst[i]
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var depends = that[k].depends || []
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// list of dependencies to move...
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var move = []
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lst
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.slice(0, i)
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.forEach(function(n, j){
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// if n is a dependency of k, prepare to move...
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if(depends.indexOf(n) >= 0){
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delete lst[j]
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move.push(n)
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}
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})
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// move the dependencies after k...
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// NOTE: this will keep the order within the dependencies...
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move.length > 0
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&& lst.splice.apply(lst, [i+1, 0].concat(move))
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// check for cyclic dependencies...
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// XXX loop signs:
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// - the tail length stops changing -- we stop progressing to list end
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// - the loop is packed
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// - each element includes a set of dependencies
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// - this set is of the same length when at a specific element
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// - we only shift the same set of N elements over N iterations
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// - ...
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if(lst.length >= max){
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// XXX get the actual cycle...
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console.error('Feature cyclic dependency...')
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break
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}
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}
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// cleanup after sort...
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lst = lst
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// remove undefined and non-features...
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.filter(function(e){
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return that[e] != null && that[e] instanceof Feature })
|
|
.reverse()
|
|
|
|
|
|
return {
|
|
input: input,
|
|
|
|
features: lst,
|
|
|
|
disabled: disabled,
|
|
unapplicable: unapplicable,
|
|
excluded: excluded,
|
|
|
|
missing: missing,
|
|
conflicts: conflicts,
|
|
}
|
|
},
|
|
|
|
|
|
//
|
|
// .setup(<actions>, [<feature>, ...])
|
|
// -> <actions>
|
|
//
|
|
// .setup([<feature>, ...])
|
|
// -> <actions>
|
|
//
|
|
setup: function(obj, lst){
|
|
// if no explicit object is given, just the list...
|
|
if(lst == null){
|
|
lst = obj
|
|
obj = null
|
|
}
|
|
|
|
obj = obj || (this.__actions__ || actions.Actions)()
|
|
|
|
lst = lst.constructor !== Array ? [lst] : lst
|
|
var features = this.buildFeatureList(obj, lst)
|
|
lst = features.features
|
|
|
|
// check for conflicts...
|
|
if(Object.keys(features.conflicts).length != 0
|
|
|| Object.keys(features.missing).length != 0){
|
|
var m = features.missing
|
|
var c = features.conflicts
|
|
|
|
// build a report...
|
|
var report = []
|
|
|
|
// missing deps...
|
|
Object.keys(m).forEach(function(k){
|
|
report.push(k + ': missing but required by:\n ' + m[k].join(', '))
|
|
})
|
|
report.push('\n')
|
|
|
|
// conflicts...
|
|
Object.keys(c).forEach(function(k){
|
|
report.push(k + ': must setup after:\n ' + c[k].join(', '))
|
|
})
|
|
|
|
// break...
|
|
throw 'Feature dependency error:\n ' + report.join('\n ')
|
|
}
|
|
|
|
// report excluded features...
|
|
if(this.__verbose__ && features.excluded.length > 0){
|
|
console.warn('Excluded features due to exclusivity conflict:',
|
|
features.excluded.join(', '))
|
|
}
|
|
|
|
// report unapplicable features...
|
|
if(this.__verbose__ && features.unapplicable.length > 0){
|
|
console.log('Features not applicable in current context:',
|
|
features.unapplicable.join(', '))
|
|
}
|
|
|
|
// do the setup...
|
|
var that = this
|
|
var setup = FeatureProto.setup
|
|
lst.forEach(function(n){
|
|
// setup...
|
|
if(that[n] != null){
|
|
this.__verbose__ && console.log('Setting up feature:', n)
|
|
setup.call(that[n], obj)
|
|
}
|
|
})
|
|
|
|
// XXX should we extend this if it already was in the object???
|
|
obj.features = features
|
|
|
|
return obj
|
|
},
|
|
remove: function(obj, lst){
|
|
lst = lst.constructor !== Array ? [lst] : lst
|
|
var that = this
|
|
lst.forEach(function(n){
|
|
if(that[n] != null){
|
|
console.log('Removing feature:', n)
|
|
that[n].remove(obj)
|
|
}
|
|
})
|
|
},
|
|
|
|
// shorthand for: Feature(<feature-set>, ...)
|
|
// XXX should this return this?
|
|
Feature: function(){
|
|
return this.__feature__.apply(null, [this].concat(args2array(arguments)))
|
|
},
|
|
}
|
|
|
|
|
|
var FeatureSet =
|
|
module.FeatureSet = object.makeConstructor('FeatureSet', FeatureSetProto)
|
|
|
|
|
|
//---------------------------------------------------------------------
|
|
|
|
var Features =
|
|
module.Features = new FeatureSet()
|
|
|
|
|
|
|
|
|
|
/**********************************************************************
|
|
* vim:set ts=4 sw=4 : */
|
|
return module })
|