shift-jisのサポートがない場合。
using System;
using han_zen;
class Program
{
static void Main(string[] args)
{
//usage
Console.WriteLine("あいうえを ".getWidth());
Console.WriteLine("" + 'ｱ'.isHalfWidth());
Console.WriteLine("" + 'ｱ'.getWidth());
Console.WriteLine("" + '亜'.getWidth());
Console.WriteLine("Hello World!");
}
}//class
namespace han_zen
{
using System.Text.RegularExpressions;
using System.Linq;
static class ZenkakuExtension
{
static Regex ptn = _();
static Regex _()
{
var range = ""
+ "a-z"
+ "A-Z"
+ "0-9"
+ "!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~ "
+ "ｱ-ﾞ" //半角カナ
;
return new Regex($"^[{range}]+$");
}
public static bool isHalfWidth(this string @str) => ptn.IsMatch(@str);
public static bool isFullWidth(this string @str) => !@str.isHalfWidth();
public static bool isHalfWidth(this char @ch) => ("" + @ch).isHalfWidth();
public static bool isFullWidth(this char @ch) => !@ch.isHalfWidth();
public static int getWidth(this char @ch) => @ch.isHalfWidth() ? 1 : 2;
public static int getWidth(this string @str) => @str.Select(getWidth).Sum();
}//class
}//namespace
↧