started work on tagging...

Signed-off-by: Alex A. Naanou <alex.nanou@gmail.com>

ui/tags.js

@@ -0,0 +1,129 @@
+/**********************************************************************
+* 
+*
+*
+**********************************************************************/
+
+// format:
+// 	{
+// 		tag: [ gid, ... ],
+// 		...
+// 	}
+//
+TAGS = {
+
+}
+
+
+
+/*********************************************************************/
+
+function buildTagsFromImages(images){
+}
+
+
+/*********************************************************************/
+
+function addTag(tags, gid, tagset, images){
+	tags = typeof(tag) == typeof('str') ? [ tags ] : tag
+	gid = gid == null ? getImageGID() : gid
+	tagset = tagset == null ? TAGS : tagset
+	images = images == null ? IMAGES : images
+	
+	// add tags to tagset...
+	tags.map(function(tag){
+		var set = tagset[tag]
+		if(set == null){
+			set = []
+			tagset[tag] = set
+		}
+		set.push(tag)
+		set.sort()
+	})
+
+	// add tag to image...
+	var img = images[gid]
+	img.tags = img.tags == null ? tags : img.tags.concat(tags)
+
+	// XXX hardcoded and not customizable...
+	IMAGES_UPDATED.push(gid)
+}
+
+
+function removeTag(tags, gid, tagset, images){
+	tags = typeof(tag) == typeof('str') ? [ tags ] : tag
+	gid = gid == null ? getImageGID() : gid
+	tagset = tagset == null ? TAGS : tagset
+	images = images == null ? IMAGES : images
+
+	var updated = false
+	var img = images[gid]
+
+	// remove tags to tagset...
+	tags.map(function(tag){
+		var set = tagset[tag]
+		if(set != null && set.indexOf(tag) >= 0){
+			updated = true
+
+			set.splice(set.indexOf(tag), 1)
+			img.tags.splice(img.tags.indexOf(tag), 1)
+
+			// clear the tags...
+			if(img.tags.length == 0){
+				delete img.tags
+			}
+		}
+	})
+
+	if(updated){
+		// XXX hardcoded and not customizable...
+		IMAGES_UPDATED.push(gid)
+	}
+}
+
+
+// this implements the AND selector...
+// NOTE: do not like this algorithm as it can get O(n^2)-ish
+function selectByTags(tags, tagset){
+	var subtagset = []
+	var res = []
+
+	// populate the subtagset...
+	tags.map(function(tag){
+		subtagset.push(tagset[tag])
+	})
+	subtagset.sort(function(a, b){ 
+		return a.length - b.length 
+	})
+
+	// set the res to the shortest subset...
+	var cur = subtagset.pop().splice()
+
+	// filter out the result...
+	cur.map(function(gid){
+		for(var i=0; i<subtagset.length; i++){
+			if(subtagset[i].indexOf(gid) < 0){
+				gid = null
+				break
+			}
+		}
+		if(gid != null){
+			res.push(gid)
+		}
+	})
+
+	return res
+}
+
+
+function getTags(){
+}
+
+
+function getRelatedTags(){
+}
+
+
+
+/**********************************************************************
+* vim:set ts=4 sw=4 :                                                */