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(function(root,factory){if(typeof define==="function"&&define.amd){define("sifter",factory)}else if(typeof exports==="object"){module.exports=factory()}else{root.Sifter=factory()}})(this,function(){var Sifter=function(items,settings){this.items=items;this.settings=settings||{diacritics:true}};Sifter.prototype.tokenize=function(query){query=trim(String(query||"").toLowerCase());if(!query||!query.length)return[];var i,n,regex,letter;var tokens=[];var words=query.split(/ +/);for(i=0,n=words.length;i<n;i++){regex=escape_regex(words[i]);if(this.settings.diacritics){for(letter in DIACRITICS){if(DIACRITICS.hasOwnProperty(letter)){regex=regex.replace(new RegExp(letter,"g"),DIACRITICS[letter])}}}tokens.push({string:words[i],regex:new RegExp(regex,"i")})}return tokens};Sifter.prototype.iterator=function(object,callback){var iterator;if(is_array(object)){iterator=Array.prototype.forEach||function(callback){for(var i=0,n=this.length;i<n;i++){callback(this[i],i,this)}}}else{iterator=function(callback){for(var key in this){if(this.hasOwnProperty(key)){callback(this[key],key,this)}}}}iterator.apply(object,[callback])};Sifter.prototype.getScoreFunction=function(search,options){var self,fields,tokens,token_count,nesting;self=this;search=self.prepareSearch(search,options);tokens=search.tokens;fields=search.options.fields;token_count=tokens.length;nesting=search.options.nesting;var scoreValue=function(value,token){var score,pos;if(!value)return 0;value=String(value||"");pos=value.search(token.regex);if(pos===-1)return 0;score=token.string.length/value.length;if(pos===0)score+=.5;return score};var scoreObject=function(){var field_count=fields.length;if(!field_count){return function(){return 0}}if(field_count===1){return function(token,data){return scoreValue(getattr(data,fields[0],nesting),token)}}return function(token,data){for(var i=0,sum=0;i<field_count;i++){sum+=scoreValue(getattr(data,fields[i],nesting),token)}return sum/field_count}}();if(!token_count){return function(){return 0}}if(token_count===1){return function(data){return scoreObject(tokens[0],data)}}if(search.options.conjunction==="and"){return function(data){var score;for(var i=0,sum=0;i<token_count;i++){score=scoreObject(tokens[i],data);if(score<=0)return 0;sum+=score}return sum/token_count}}else{return function(data){for(var i=0,sum=0;i<token_count;i++){sum+=scoreObject(tokens[i],data)}return sum/token_count}}};Sifter.prototype.getSortFunction=function(search,options){var i,n,self,field,fields,fields_count,multiplier,multipliers,get_field,implicit_score,sort;self=this;search=self.prepareSearch(search,options);sort=!search.query&&options.sort_empty||options.sort;get_field=function(name,result){if(name==="$score")return result.score;return getattr(self.items[result.id],name,options.nesting)};fields=[];if(sort){for(i=0,n=sort.length;i<n;i++){if(search.query||sort[i].field!=="$score"){fields.push(sort[i])}}}if(search.query){implicit_score=true;for(i=0,n=fields.length;i<n;i++){if(fields[i].field==="$score"){implicit_score=false;break}}if(implicit_score){fields.unshift({field:"$score",direction:"desc"})}}else{for(i=0,n=fields.length;i<n;i++){if(fields[i].field==="$score"){fields.splice(i,1);break}}}multipliers=[];for(i=0,n=fields.length;i<n;i++){multipliers.push(fields[i].direction==="desc"?-1:1)}fields_count=fields.length;if(!fields_count){return null}else if(fields_count===1){field=fields[0].field;multiplier=multipliers[0];return function(a,b){return multiplier*cmp(get_field(field,a),get_field(field,b))}}else{return function(a,b){var i,result,a_value,b_value,field;for(i=0;i<fields_count;i++){field=fields[i].field;result=multipliers[i]*cmp(get_field(field,a),get_field(field,b));if(result)return result}return 0}}};Sifter.prototype.prepareSearch=function(query,options){if(typeof query==="object")return query;options=extend({},options);var option_fields=options.fields;var option_sort=options.sort;var option_sort_empty=options.sort_empty;if(option_fields&&!is_array(option_fields))options.fields=[option_fields];if(option_sort&&!is_array(option_sort))options.sort=[option_sort];if(opti
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