文字種判定

コード

<input type="button" value="判定" onclick="judge()">

<script>
"use strict";
(function(window, document, undefined){
function $(id, val){
	var el = document.getElementById(id);
	if( val!==undefined) {
		val = val.replace(/\\n/g, "\n");
		el.value=val;
	}
	return el.value;
}

var Judge = (function(){
	
	var _results = [];
	var _methods = [];
	
	function Judge(searchLetter, text, option) {
		if( this.constructor !== Judge ){
			return new Judge(searchLetter, text, option);
		}
		
		this.source = escapeRegExpString(searchLetter);
		this.leftContext = ''; // 前文字
		this.rightContext = ''; // 後文字
		this.$1 = ''; // 検査結果 前
		this.$2 = ''; // 検査結果 後
		
		if( arguments.length > 1 ){
			this.exec(text, option);
			//_judge.call(this, text, option);
			return [this.$1, this.$2];
		}
		return this;
	};
	Judge.add = function(pattern, type){
		_results.push(arguments[arguments.length-1]);
		_methods.push(arguments.length>2 ? Array.prototype.slice.call(arguments, 0, arguments.length-1) : pattern);
	};
	
	Judge.prototype = {
		constructor: Judge,
		exec: function(text, option){
			option = String(option) || "";
			text = String(text) || "";
			_judge.call(this, text, option);
			return (this.$1 !== undefined || this.$2 !== undefined);
		},
		
		toString: function(){
			return this.source;
		}
	};
	
	
	/****
	text: String
	option: String
	****/
	function _judge(text, option){
		var len = ( option.match(/1/) )? c.length: 1;
		var c = this.source.substring(0, len);
		
		if( option.match(/m/) ){
		}
		
		var r1, r2;
		var code = c.charCodeAt(0);
		var leftCode = -1, rightCode = -1;
		
		var re = text.match( RegExp("(^|.?)"+c+"(.?|$)") );
		if( re ){
			leftCode = re[1].charCodeAt(0),
			rightCode = re[2].charCodeAt(0);
			
			this.leftContext = re[1];
			this.rightContext = re[2];
			
		}
		
		re && _methods.forEach(function(item, index, array){
			if( item.constructor === Array ){
				if( item[0] <= leftCode && leftCode <= item[1] ){
					r1 = _results[index];
					
				}
				if( item[0] <= rightCode && rightCode <= item[1] ){
					r2 = _results[index];
					
				}
				
			}else if( item.constructor === RegExp ){
				if( item.toString() === "/^/" ){
					r1 =  _isFirst(c, text)? _results[index]: r1;
					
				}else if( item.toString() === "/$/" ){
					r2 = _isLast(c, text)? _results[index]: r2;
					
				}else{
					if( !r1 && item.exec(re[1]) ){
						r1 = _results[index];
						
					}
					if( !r2 && item.exec(re[2]) ){
						r2 = _results[index];
						
					}
					
				}
				
			}
			
		});
		
		this.$1 = r1;
		this.$2 = r2;
		return [r1, r2];
	}
	
	
	function escapeRegExpString(s){
		return s.replace(/([\.+*[|?{<>:=-])/g, "\\$1");
								 
	}
	function _isFirst(c, text){
		return text.indexOf(c)===0;
	
	}
	function _isLast(c, text){
		return text.indexOf(c)===text.length-1;
	
	}
	
	return Judge;
	
})();


function judge(){
	
	var c = $('ipt_c'),
	    text = $('ipt_text'),
	    result = '';
	
	
	var judge = new Judge(c);
	
	var judge_result1 = judge.exec(text);
	if( !judge_result1 ){
		result += "マッチしません。";

	}else if( judge.$1 === judge.$2 ){
		result += judge.$1 + "です。";

	}else{
		result += "前が" + judge.$1 + "("+judge.leftContext + ")"+ "で後ろが" + judge.$2 + "("+judge.rightContext+")" + "です。";

	}
	
	result += "\n";
	$('ipt_out', result);

}

window.Judge = Judge;
window.$ = $;
window.judge = judge;
})(this, document, void(0));

Judge.add(/[a-zA-Z]/, "アルファベット");
Judge.add(/[あ-ん]/, "ひらがな");
Judge.add(/[　\s]/, "空白");
Judge.add(/^/, "先頭");
Judge.add(/$/, "終端");
Judge.add(128, 256, "半角カナ");
Judge.add(65393, 65473, "半角カナ");

</script>

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