jQuery.spamChecker.js

/* jQuery SpamChecker Js
 
 *----------------------------------------------------
 * The MIT License (MIT) Copyright (c) 2014          |
 * copyright : Mistuki Suzuki                        |
 *                                                   |
 *----------------------------------------------------
*/

;!function(j){
	j.fn.spamChecker = function spamChecker(options)
	{	
		return this.each(function(){
			new spamChecker.init(this, options);
		});		
	},
	j.fn.spamChecker.init = function(elements, options)
	{	
		var self = this,
		queryElems, fncs=[];
		
		j.extend(self.options, options),
		queryElems = j(elements).find(self.options.query),
		
		j.each(queryElems, function(i){
			var element = this,
			text = j(element).text();
			
		    fncs[i] = j.ajax({
		        url:'http://ajax.googleapis.com/ajax/services/search/web?v=1.0&q='+encodeURIComponent(text),
		        dataType:'jsonp'
		    }).then(
		    	function(res){
			        self.jury(res, text, element)
		        },
		        function(){
				self.options.error.call(element, arguments)
			}
		    )
		}),
						
		j.when.apply(j,fncs).done(
			function(){
				self.options.complete.call(elements, arguments)
			}
		);
	},
	j.fn.spamChecker.init.prototype = 
	{
		jury : function( resultData, text, element )
		{	
			var self = this,
			i, j, result, similarRes = {}
			, threshold = self.options.threshold, spamPoint = 0
			, resultData = resultData.responseData.results;
			
			
			for( i = 0; (result = resultData[i] ) != null; i++ )
			{
				
				for(j = 0; j < self.spamWords.length; j = j++ )
				{
					if( text.match( RegExp(self.spamWords[j]) ) )
					{
						threshold = threshold - 2;
					}	
				};
				
				similarRes = self.similar_text(result.content, text);
								
				if( similarRes.similar > threshold )
				{
					spamPoint = spamPoint + 1;
				};
			};
				
			if( spamPoint > 3 )
			{
				self.options.correct.call( element, similarRes, spamPoint );
			}
			else
			{
				self.options.incorrect.call( element, similarRes, spamPoint );
			};

		},
		similar_str : function(text1, len1, text2, len2)
		{
	        var pos1 = 0,
	            pos2 = 0,
	            max = 0,
	            i, j, l;
	
	        for (i = 0; i < len1; ++i)
	        {
	            for (j = 0; j < len2; ++j)
	            {
	                for (l = 0;
	                    (i + l < len1) && (j + l < len2) &&
	                    (text1.charAt(i + l) == text2.charAt(j + l)); ++l);
	                if (l > max)
	                {
	                    max = l;
	                    pos1 = i;
	                    pos2 = j;
	                }
	            }
	        }
	
	        return {
	            'pos1': pos1,
	            'pos2': pos2,
	            'max': max
	        };
	    },
		similar_char : function(text1, len1, text2, len2)
		{
	        var r = this.similar_str(text1, len1, text2, len2),
	        sum = r.max;
	        if (sum)
	        {
	            if (r.pos1 && r.pos2)
	            {
	                sum += this.similar_char(text1, r.pos1, text2, r.pos2);
	            }
	            if ((r.pos1 + r.max < len1) && (r.pos2 + r.max < len2))
	            {
	                sum += this.similar_char(
	                    text1.substr(r.pos1 + r.max),
	                    len1 - r.pos1 - r.max,
	                    text2.substr(r.pos2 + r.max),
	                    len2 - r.pos2 - r.max);
	            }
	        }
	        return sum;
	    },
		similar_text : function(text1, text2)
		{
		    var sim = this.similar_char(text1, text1.length, text2, text2.length);
		    return {
		        'similar': sim,
		        'percent': sim * 200.0 / (text1.length + text2.length)
		    };
		},
		spamWords : [
			'他の人の意見',
			'ameblo.jp',
			'芸能プロダクション',
			'色んなブログ',
			'いろんな方のブログ',
			'読者登録',
			'また遊び',
			'また来ま',
			'更新楽し',
			'ぜひ遊びに',
			'また覗かせ',
			'交流できれば',
			'無料プレゼント'
		],
		options : {
			correct : function(){},
			incorrect : function(){},
			complete : function(){},
			error : this.incorrect,
			threshold : 20,
			query : 'li'
		}
	}
}(jQuery);