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341.txt
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341.txt
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* 符号位置 (code point)
** 古い HTML 仕様における定義
[11] 古い [[HTML]] 仕様は独自に「[[符号位置]]」という語を定義していました。現在の [[HTML]]
仕様 ([[HTML]]、[[Web Applications 1.0]]) は独自の定義を含んでいません。
[2]
>
:[DFN[[RUBYB[[[符号位置]]]@en[code position]]]]:
[[符号化文字集合]]の[[変域]]中の[[整数]]。
符号化文字集合は符号位置を[[文字]]に写像する。
;; [10] [[RFC 1866]], [[ISO‐HTML]] <http://purl.org/NET/ISO+IEC.15445/15445.html#DEFS> 4.5
** IDN2003 における定義
[1]
> [DFN[[RUBY[[[符号位置]]][ふごういち]@en[code point]]]]は、
[[符号化文字集合]]中の[[文字]]に関連付けられた[[整数値]]です。
;; [6] [[RFC 3490]] 2.、
[7] [CITE@en[RFC 3492 - Punycode: A Bootstring encoding of Unicode for Internationalized Domain Names in Applications (IDNA)]]
<http://tools.ietf.org/html/rfc3492#section-2>
** IDN2008 における定義
[9]
> [DFN[[RUBYB[符号位置]@en[code point]]]]は、[[符号化文字集合]]の[RUBYB[[[符号空間]]]@en[codespace]]中の[[整数]]値です。
;; [8] [CITE@en[RFC 5890 - Internationalized Domain Names for Applications (IDNA): Definitions and Document Framework]]
<http://tools.ietf.org/html/rfc5890#section-2.1>
** XDM における定義
[12]
> This document uses the term "code point", sometimes spelt "codepoint" (also known as "character number" or "code position") to mean a non-negative integer that represents a character in some encoding.
[5] [CITE@EN[XQuery 1.0 and XPath 2.0 Functions and Operators (Second Edition)]]
<http://www.w3.org/TR/2010/REC-xpath-functions-20101214/#string-types>
* 表記法
[17] [[Unicode]] / [[UCS]] の[[符号位置]]は、 [CODE[[[U+]]]] や [CODE[[[U-]]]]
によって[[符号位置]]を表します。
[19] [[7ビット符号]]や[[8ビット符号]]の[[ビット組合せ]]は、 [CODE[/]]
によって4ビットずつの[[十進数]]を組み合わせて表記して表します。
[18] [[JIS X 0218]] は[[短縮識別名称]]を規定していました。
[4] [[エスケープ]]も参照。
* 関連
[3] 「[[文字]]」、「[[符号位置]]」 (「[[code point]]」、「[[code position]]」)、「[[符号単位]]」
などはしばしば混用されます。
[13] [[Unicodeスカラー値]]は [[Unicode]] における[[符号位置]]を表す語です。
[14] [CITE@EN[XPath and XQuery Functions and Operators 3.0]]
( ([TIME[2014-04-08 07:02:07 +09:00]] 版))
<http://www.w3.org/TR/xpath-functions-3/#codepoint>
[15] [CITE@en[Character Model for the World Wide Web 1.0: Fundamentals]]
( ([TIME[2005-02-15 14:24:00 +09:00]] 版))
<http://www.w3.org/TR/charmod/#def-CCS>
[16] [CITE@en[RFC 6797 - HTTP Strict Transport Security (HSTS)]] ([TIME[2014-06-02 05:16:10 +09:00]] 版) <http://tools.ietf.org/html/rfc6797#section-4>
>
:codepoint:
is a colloquial contraction of Code Point, which is any value in
the Unicode codespace; that is, the range of integers from 0 to
10FFFF(hex) [Unicode].
[FIG(quote)[
[FIGCAPTION[
[20] [CITE[perldelta - search.cpan.org]]
( ([TIME[2016-05-10 17:56:10 +09:00]]))
<http://search.cpan.org/~rjbs/perl-5.24.0/pod/perldelta.pod>
]FIGCAPTION]
> Using code points above the platform's IV_MAX is now deprecated
> Unicode defines code points in the range 0..0x10FFFF. Some standards at one time defined them up to 2**31 - 1, but Perl has allowed them to be as high as anything that will fit in a word on the platform being used. However, use of those above the platform's IV_MAX is broken in some constructs, notably tr///, regular expression patterns involving quantifiers, and in some arithmetic and comparison operations, such as being the upper limit of a loop. Now the use of such code points raises a deprecation warning, unless that warning category is turned off. IV_MAX is typically 2**31 -1 on 32-bit platforms, and 2**63-1 on 64-bit ones.
]FIG]
[21] [CITE@en[Editorial: start using the Infra Standard]]
([[annevk]]著, [TIME[2016-11-18 20:21:54 +09:00]])
<https://github.com/whatwg/encoding/commit/a26f76889bf393999e9caad84a3647ab09c39e09>
[22] [CITE@en[Change Unicode \u -> U+ (Fix #127)]]
([[garykac]]著, [TIME[2016-12-17 12:11:30 +09:00]])
<https://github.com/w3c/uievents/commit/2cfeb1f351f18e9eb3318563267b87b3e2e8f3f3>
[23] [CITE@en[Convert 'codepoint' to 'code point' to match the Unicode Standard]]
([[vkatsikaros]]著, [TIME[2017-01-16 23:36:01 +09:00]])
<https://github.com/w3c/webdriver/commit/a230a6144089c8a3558ea7101d2b4adb51531aa5>
[24] [CITE@en[XQuery and XPath Data Model 3.1]]
([TIME[2017-03-20 07:26:25 +09:00]])
<https://www.w3.org/TR/2017/REC-xpath-datamodel-31-20170321/#dt-codepoint>
[25] [CITE@EN[XPath and XQuery Functions and Operators 3.1]]
([TIME[2017-03-21 16:02:06 +09:00]])
<https://www.w3.org/TR/2017/REC-xpath-functions-31-20170321/#codepoint>
[26] [CITE@en[Improve representation guidelines for bytes and code points]]
([[annevk]]著, [TIME[2017-03-23 22:25:17 +09:00]])
<https://github.com/whatwg/infra/commit/543b2c48b6e1babb50d77e5a3ba5b86be8b56eb9>
[27] [CITE@en[Define character as alias for code point]]
([[annevk]]著, [TIME[2017-03-27 16:14:19 +09:00]])
<https://github.com/whatwg/infra/commit/034569bc45594f30a903cb348f9fde35c2a27609>
[28] [CITE@en[Define character as alias for code point by annevk · Pull Request #104 · whatwg/infra]]
([TIME[2017-03-28 18:34:52 +09:00]])
<https://github.com/whatwg/infra/pull/104>
[29] [CITE@en[Editorial: format bytes and code points per Infra]]
([[annevk]]著, [TIME[2017-03-28 21:14:42 +09:00]])
<https://github.com/whatwg/url/commit/91cb2aa532bc2b217e6237d23649aed0d2c566bb>
[30] [CITE@en[Editorial: let code point and friends be defined by Infra]]
([[annevk]]著, [TIME[2017-03-29 17:47:15 +09:00]])
<https://github.com/whatwg/html/commit/59595d9c2ccadb9332c15048be5d30174532ee70>
[31] [CITE@en[Deal with the parentheses exception for code point/byte display]]
([[annevk]]著, [TIME[2017-03-30 13:25:34 +09:00]])
<https://github.com/whatwg/infra/commit/a743dbd7f1c9d6200d8eaae127aeeb85a701fb02>
[32] [CITE@en['''['''css-syntax''']''' Remove 'code point' and 'surrogate code point' in favor …]]
([[tabatkins]]著, [TIME[2017-06-10 03:59:51 +09:00]])
<https://github.com/w3c/csswg-drafts/commit/320a990184a331057a56a17cdf627fee81bdc5d3>
[FIG(quote)[
[FIGCAPTION[
[33] [CITE@EN[XSL Transformations (XSLT) Version 3.0]]
([TIME[2017-06-06 21:59:56 +09:00]])
<https://www.w3.org/TR/2017/REC-xslt-30-20170608/#analyze-string>
]FIGCAPTION]
> The term character, here as elsewhere in this specification, means a Unicode codepoint.
]FIG]
[34] [CITE@en[Allow decimals with no leading 0 as the time in refresh <meta>]]
([[domenic]]著, [TIME[2017-07-22 06:10:04 +09:00]])
<https://github.com/whatwg/html/commit/b8a34e302cdf0289f5403a02905629bb358519a6>