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cppdraft/lex/universal/char.md

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+[lex.universal.char]
+
+# 5 Lexical conventions [[lex]](./#lex)
+
+## 5.3 Characters [[lex.char]](lex.char#lex.universal.char)
+
+### 5.3.2 Universal character names [lex.universal.char]
+
+[n-char:](#nt:n-char "5.3.2 Universal character names [lex.universal.char]")  
+any member of the translation character set except the U+007d right curly bracket or new-line character
+
+[n-char-sequence:](#nt:n-char-sequence "5.3.2 Universal character names [lex.universal.char]")  
+[*n-char*](#nt:n-char "5.3.2 Universal character names [lex.universal.char]") [*n-char-sequence*](#nt:n-char-sequence "5.3.2 Universal character names [lex.universal.char]")opt
+
+[named-universal-character:](#nt:named-universal-character "5.3.2 Universal character names [lex.universal.char]")  
+\N{ [*n-char-sequence*](#nt:n-char-sequence "5.3.2 Universal character names [lex.universal.char]") }
+
+[hex-quad:](#nt:hex-quad "5.3.2 Universal character names [lex.universal.char]")  
+[*hexadecimal-digit*](lex.icon#nt:hexadecimal-digit "5.13.2 Integer literals [lex.icon]") [*hexadecimal-digit*](lex.icon#nt:hexadecimal-digit "5.13.2 Integer literals [lex.icon]") [*hexadecimal-digit*](lex.icon#nt:hexadecimal-digit "5.13.2 Integer literals [lex.icon]") [*hexadecimal-digit*](lex.icon#nt:hexadecimal-digit "5.13.2 Integer literals [lex.icon]")
+
+[simple-hexadecimal-digit-sequence:](#nt:simple-hexadecimal-digit-sequence "5.3.2 Universal character names [lex.universal.char]")  
+[*hexadecimal-digit*](lex.icon#nt:hexadecimal-digit "5.13.2 Integer literals [lex.icon]") [*simple-hexadecimal-digit-sequence*](#nt:simple-hexadecimal-digit-sequence "5.3.2 Universal character names [lex.universal.char]")opt
+
+[universal-character-name:](#nt:universal-character-name "5.3.2 Universal character names [lex.universal.char]")  
+\u [*hex-quad*](#nt:hex-quad "5.3.2 Universal character names [lex.universal.char]")  
+\U [*hex-quad*](#nt:hex-quad "5.3.2 Universal character names [lex.universal.char]") [*hex-quad*](#nt:hex-quad "5.3.2 Universal character names [lex.universal.char]")  
+\u{ [*simple-hexadecimal-digit-sequence*](#nt:simple-hexadecimal-digit-sequence "5.3.2 Universal character names [lex.universal.char]") }  
+[*named-universal-character*](#nt:named-universal-character "5.3.2 Universal character names [lex.universal.char]")
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/lex.tex#L467)
+
+The [*universal-character-name*](#nt:universal-character-name "5.3.2 Universal character names [lex.universal.char]") construct provides a way to name any
+element in the translation character set using just the basic character set[.](#1.sentence-1)
+
+If a [*universal-character-name*](#nt:universal-character-name "5.3.2 Universal character names [lex.universal.char]") outside
+the [*c-char-sequence*](lex.ccon#nt:c-char-sequence "5.13.3 Character literals [lex.ccon]"), [*s-char-sequence*](lex.string#nt:s-char-sequence "5.13.5 String literals [lex.string]"), or[*r-char-sequence*](lex.string#nt:r-char-sequence "5.13.5 String literals [lex.string]") of a [*character-literal*](lex.ccon#nt:character-literal "5.13.3 Character literals [lex.ccon]") or[*string-literal*](lex.string#nt:string-literal "5.13.5 String literals [lex.string]") (in either case, including within a [*user-defined-literal*](lex.ext#nt:user-defined-literal "5.13.9 User-defined literals [lex.ext]"))
+corresponds to a control character or to a character in the basic character set,
+the program is ill-formed[.](#1.sentence-2)
+
+[*Note [1](#note-1)*:
+
+A sequence of characters resembling a [*universal-character-name*](#nt:universal-character-name "5.3.2 Universal character names [lex.universal.char]") in an[*r-char-sequence*](lex.string#nt:r-char-sequence "5.13.5 String literals [lex.string]") ([[lex.string]](lex.string "5.13.5 String literals")) does not form a[*universal-character-name*](#nt:universal-character-name "5.3.2 Universal character names [lex.universal.char]")[.](#1.sentence-3)
+
+— *end note*]
+
+[2](#2)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/lex.tex#L483)
+
+A [*universal-character-name*](#nt:universal-character-name "5.3.2 Universal character names [lex.universal.char]") of the form \u [*hex-quad*](#nt:hex-quad "5.3.2 Universal character names [lex.universal.char]"),\U [*hex-quad*](#nt:hex-quad "5.3.2 Universal character names [lex.universal.char]") [*hex-quad*](#nt:hex-quad "5.3.2 Universal character names [lex.universal.char]"), or\u{[*simple-hexadecimal-digit-sequence*](#nt:simple-hexadecimal-digit-sequence "5.3.2 Universal character names [lex.universal.char]")} designates the character in the translation character set
+whose Unicode scalar value is the hexadecimal number represented by
+the sequence of [*hexadecimal-digit*](lex.icon#nt:hexadecimal-digit "5.13.2 Integer literals [lex.icon]")*s* in the [*universal-character-name*](#nt:universal-character-name "5.3.2 Universal character names [lex.universal.char]")[.](#2.sentence-1)
+
+The program is ill-formed if that number is not a Unicode scalar value[.](#2.sentence-2)
+
+[3](#3)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/lex.tex#L494)
+
+A [*universal-character-name*](#nt:universal-character-name "5.3.2 Universal character names [lex.universal.char]") that is a [*named-universal-character*](#nt:named-universal-character "5.3.2 Universal character names [lex.universal.char]") designates the corresponding character
+in the Unicode Standard (chapter 4.8 Name)
+if the [*n-char-sequence*](#nt:n-char-sequence "5.3.2 Universal character names [lex.universal.char]") is equal
+to its character name or
+to one of its character name aliases of
+type “control”, “correction”, or “alternate”;
+otherwise, the program is ill-formed[.](#3.sentence-1)
+
+[*Note [2](#note-2)*:
+
+These aliases are listed in
+the Unicode Character Database's NameAliases.txt[.](#3.sentence-2)
+
+None of these names or aliases have leading or trailing spaces[.](#3.sentence-3)
+
+— *end note*]