mirror of
https://github.com/flynx/ImageGrid.git
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451 lines
12 KiB
JavaScript
Executable File
451 lines
12 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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console.log('>>> features')
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//var DEBUG = DEBUG != null ? DEBUG : true
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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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// .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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// .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 true 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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// XXX should this use inheritance???
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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.actions.config
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if(actions.config == null){
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actions.config = {}
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}
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Object.keys(config).forEach(function(n){
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// keep existing keys...
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if(actions.config[n] === undefined){
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actions.config[n] = config[n]
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}
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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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var Feature =
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module.Feature =
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function Feature(feature_set, obj){
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if(obj == null){
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obj = feature_set
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// XXX is this a good default???
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feature_set = Features
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}
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obj.__proto__ = FeatureProto
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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 FeatureSet =
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module.FeatureSet = {
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// Build feature list...
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//
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// Build a list of all registered features
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// .buildFeatureList()
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// .buildFeatureList(actions)
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// -> list
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//
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// Build a list of given features
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// .buildFeatureList(null, list)
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// .buildFeatureList(actions, list)
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// -> list
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//
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//
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// NOTE: some feature .isApplicable(..) may expect the action set thus
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// making it required for building a feature list.
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// NOTE: this will try and keep the order as close as possible to the
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// original as possible, this if the list is correctly ordered
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// it will not be affected...
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// NOTE: this will fix most dependency ordering errors except for two:
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// - cyclic dependencies
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// e.g. a -> b and b -> a, here there is no way to reorder
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// a and b to resolve this.
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// - dependency / priority conflict
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// e.g. a -> b but a has a higher priority that b thus
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// making it impossible to order the two without
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// breaking either the dependency or priority ordering.
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//
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//
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// Dependency sorting:
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//
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// These are order dependencies, i.e. for a dependency to be
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// resolved it must satisfy ALL of the folowing:
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// - all dependencies must exist in the list.
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// - all dependencies must be positiond/setup before the dependant.
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//
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// The general algorithm is as folows:
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// 1) place the dependencies befeore the dependant for each element
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// 2) remove the duplicate features except fot the first occurance
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// 3) repeat 1 and 2 for 2 to depth times or until the feature list
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// stabelizes, i.e. no new features are added on the last run.
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//
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// NOTE: if auto_include is true (default) this will add dependencies
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// as they are needed...
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// This is useful for "meta-features" that do nothing other than
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// depend/include sets of other features, for exmale: 'ui',
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// 'core', 'browser', ...etc.
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// NOTE: dependency chains larger than depth will be dropped, this
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// can be fixed by setting a greater depth (default: 8)...
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// NOTE: conflicts that can occur and can not be recovered from:
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// - cyclic dependency
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// X will be before one of its dependencies...
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// - dependency / priority conflict
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// X will have higher priority than one of its dependencies...
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buildFeatureList: function(obj, lst, auto_include, depth){
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lst = lst == null ? Object.keys(this) : lst
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lst = lst.constructor !== Array ? [lst] : lst
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auto_include = auto_include == null ? true : false
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depth = depth || 8
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var that = this
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// helpers...
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// NOTE: _skipMissing(..) will add missing dependencies to missing...
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var _skipMissing = function(feature, deps, missing){
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return deps.filter(function(d){
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if(lst.indexOf(d) < 0){
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if(missing[d] == null){
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missing[d] = []
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}
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if(missing[d].indexOf(feature) < 0){
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missing[d].push(feature)
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}
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}
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return missing[d] == null
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})
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}
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var _sortDep = function(lst, missing){
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var res = []
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lst.forEach(function(n){
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var e = that[n]
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// no dependencies...
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if(e.depends == null || e.depends.length == 0){
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res.push(n)
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} else {
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// auto-include dependencies...
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if(auto_include){
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var deps = e.depends
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// skip dependencies that are not in list...
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} else {
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var deps = _skipMissing(n, e.depends, missing)
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}
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// place dependencies before the depended...
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res = res.concat(deps)
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res.push(n)
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}
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})
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return res
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}
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// expand and sort dependencies...
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// 2+ times untill depth is 0 or length stabelizes...
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var missing = {}
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lst = _sortDep(lst, missing).unique()
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var l
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do {
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l = lst.length
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lst = _sortDep(lst, missing).unique()
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depth -= 1
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} while(l != lst.length && depth > 0)
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// sort features via priority keeping the order as close to
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// manual as possible...
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var l = lst.length
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lst = lst
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// remove undefined and non-features...
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.filter(function(e){ return that[e] != null
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&& that[e] instanceof Feature })
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// build the sort table: [ <priority>, <rev-index>, <elem> ]
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// NOTE: <rev-index> is element number from the tail...
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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: for some reason JS compares lists as strings so we
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// have to comare 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 -- drom the table...
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.map(function(e){ return e[2] })
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// clasify features...
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var unapplicable = []
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var conflicts = {}
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lst = lst.filter(function(n, i){
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var e = that[n]
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if(e == null){
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return true
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}
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// check applicability...
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if(!e.isApplicable(obj)){
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unapplicable.push(n)
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return false
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}
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// no dependencies...
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if(e.depends == null || e.depends.length == 0){
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return true
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}
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// keep only conflicting...
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var deps = e.depends.filter(function(dep){
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dep = lst.indexOf(dep)
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return dep == -1 || dep > i
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})
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// skip missing dependencies...
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// NOTE: we need to check for missing again as a feature
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// could have been removed due to inapplicability or
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// being undefined...
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deps = _skipMissing(n, deps, missing)
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// no conflicts...
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if(deps.length == 0){
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return true
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}
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// dependency exists but in wrong order -- can't fix...
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conflicts[n] = deps
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return false
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})
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// skip duplicate exclusive features...
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var exclusive = []
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var excluded = []
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lst = lst.filter(function(n){
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var e = that[n]
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if(e == null || 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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if(!res){
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excluded.push(n)
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}
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return res
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})
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return {
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features: lst,
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excluded: excluded,
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missing: missing,
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conflicts: conflicts,
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unapplicable: unapplicable,
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}
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},
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setup: function(obj, lst){
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lst = lst.constructor !== Array ? [lst] : lst
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var features = this.buildFeatureList(obj, lst)
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lst = features.features
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// check for conflicts...
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if(Object.keys(features.conflicts).length != 0
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|| Object.keys(features.missing).length != 0){
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var m = features.missing
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var c = features.conflicts
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// build a report...
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var report = []
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// missing deps...
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Object.keys(m).forEach(function(k){
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report.push(k + ': missing but required by:\n ' + m[k].join(', '))
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})
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report.push('\n')
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// conflicts...
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Object.keys(c).forEach(function(k){
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report.push(k + ': must setup after:\n ' + c[k].join(', '))
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})
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// break...
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throw 'Feature dependency error:\n ' + report.join('\n ')
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}
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// report excluded features...
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if(features.excluded.length > 0){
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console.warn('Excluded features due to exclusivity conflict:',
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features.excluded.join(', '))
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}
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// report unapplicable features...
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if(features.unapplicable.length > 0){
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console.log('Features not applicable in current context:',
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features.unapplicable.join(', '))
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}
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// do the setup...
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var that = this
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var setup = FeatureProto.setup
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lst.forEach(function(n){
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// setup...
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if(that[n] != null){
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console.log('Setting up feature:', n)
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setup.call(that[n], obj)
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}
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})
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},
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remove: function(obj, lst){
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lst = lst.constructor !== Array ? [lst] : lst
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var that = this
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lst.forEach(function(n){
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if(that[n] != null){
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console.log('Removing feature:', n)
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that[n].remove(obj)
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}
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})
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},
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}
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//---------------------------------------------------------------------
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var Features =
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module.Features = Object.create(FeatureSet)
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/**********************************************************************
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* vim:set ts=4 sw=4 : */
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return module })
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