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ひあるび日記

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2005年11月[全文表示|タイトル一覧表示]

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2005年11月19日(土): 考えてみりゃ…ねぇ。

問．以下のJavaScriptの関数が示すものは？
答．虚無感。

function encodeString(string) {
	var encodedString = '';
	var ii;
	for (ii = 0;ii < string.length;ii++) {
		var ucsCode = string.charCodeAt(ii);
		var encodedCharacter = '';
		if ((0x00 <= ucsCode) && (ucsCode <= 0x7F)) {
			encodedCharacter += '%' + ('0' + ucsCode.toString(0x10)).substr(-2);
		} else if (ucsCode <= 0x7FF) {
			encodedCharacter += '%' + (0xC0 | ((ucsCode & 0x7C0) >> 6)).toString(0x10);
			encodedCharacter += '%' + (0x80 | ((ucsCode & 0x03F) >> 0)).toString(0x10); // 行をそろえたいだけ
		} else if (ucsCode <= 0xFFFF) {
			encodedCharacter += '%' + (0xE0 | ((ucsCode & 0xF000) >> 12)).toString(0x10);
			encodedCharacter += '%' + (0x80 | ((ucsCode & 0x0FC0) >>  6)).toString(0x10);
			encodedCharacter += '%' + (0x80 | ((ucsCode & 0x003F) >>  0)).toString(0x10);
		} else if (ucsCode <= 0x1FFFFF) {
			encodedCharacter += '%' + (0xF0 | ((ucsCode & 0x1C0000) >> 18)).toString(0x10);
			encodedCharacter += '%' + (0x80 | ((ucsCode & 0x03F000) >> 12)).toString(0x10);
			encodedCharacter += '%' + (0x80 | ((ucsCode & 0x000FC0) >>  6)).toString(0x10);
			encodedCharacter += '%' + (0x80 | ((ucsCode & 0x00003F) >>  0)).toString(0x10);
		} else if (ucsCode <= 0x3FFFFFF) {
			encodedCharacter += '%' + (0xF8 | ((ucsCode & 0x3000000) >> 24)).toString(0x10);
			encodedCharacter += '%' + (0x80 | ((ucsCode & 0x0FC0000) >> 18)).toString(0x10);
			encodedCharacter += '%' + (0x80 | ((ucsCode & 0x003F000) >> 12)).toString(0x10);
			encodedCharacter += '%' + (0x80 | ((ucsCode & 0x0000FC0) >>  6)).toString(0x10);
			encodedCharacter += '%' + (0x80 | ((ucsCode & 0x000003F) >>  0)).toString(0x10);
		} else /* if (ucsCode <= 7FFFFFFF) */ {
			encodedCharacter += '%' + (0xFC | ((ucsCode & 0x40000000) >> 30)).toString(0x10);
			encodedCharacter += '%' + (0x80 | ((ucsCode & 0x3F000000) >> 24)).toString(0x10);
			encodedCharacter += '%' + (0x80 | ((ucsCode & 0x00FC0000) >> 18)).toString(0x10);
			encodedCharacter += '%' + (0x80 | ((ucsCode & 0x0003F000) >> 12)).toString(0x10);
			encodedCharacter += '%' + (0x80 | ((ucsCode & 0x00000FC0) >>  6)).toString(0x10);
			encodedCharacter += '%' + (0x80 | ((ucsCode & 0x0000003F) >>  0)).toString(0x10);
		}
		encodedString += encodedCharacter;
	}
	return encodedString;
}