digitalmars.D.learn - Unicode symbols in the identifiers

Andrey (18/18) Jan 10 2013 Should these variants serve as identifiers?

evilrat (3/21) Jan 10 2013 save module as utf8(or any other enconding from list above) file,

Andrey (7/9) Jan 10 2013 I'm pretty sure I'm saving it in unicode. I can use all unicode

Andrey (1/1) Jan 11 2013 Forgot to mention. Linux 64 bit, D version 2.060
evilrat (4/8) Jan 11 2013 don't have any errors with this code(dmd 2.061, win8)

H. S. Teoh (16/22) Jan 10 2013 Weird, identifiers like "Цвет" and "張" and even "ℝ" all work fin...
Jacob Carlborg (12/29) Jan 11 2013 According to the specification D doesn't necessarly support unicode

Andrey (23/32) Jan 11 2013 http://www.algonet.se/~afb/d/universalalphas/universalalphas.html

Regan Heath (11/12) Jan 11 2013 See:

"Andrey" <andr-sar yandex.ru> writes:

Should these variants serve as identifiers?

auto x²; //fails to compile: char 0x00b2 not allowed in 
identifier, unsupported char 0xb2 (why? is it not a digit?)

Same for ⅀, ∫ and etc.

Official documentations says:
«
D source text can be in one of the following formats:
ASCII
UTF-8
UTF-16BE
UTF-16LE
UTF-32BE
UTF-32LE
»

Math symbols could have a great use compare to just characters 
from other languages (who does code in Greek or Chinese?). Still, 
this function name in russian cause compile error: 2.вквадрате 
(вквадрате(2))

Jan 10 2013

"evilrat" <evilrat666 gmail.com> writes:

On Friday, 11 January 2013 at 02:09:33 UTC, Andrey wrote:
 Should these variants serve as identifiers?

 auto x²; //fails to compile: char 0x00b2 not allowed in 
 identifier, unsupported char 0xb2 (why? is it not a digit?)

 Same for ⅀, ∫ and etc.

 Official documentations says:
 «
 D source text can be in one of the following formats:
 ASCII
 UTF-8
 UTF-16BE
 UTF-16LE
 UTF-32BE
 UTF-32LE
 »

 Math symbols could have a great use compare to just characters 
 from other languages (who does code in Greek or Chinese?). 
 Still, this function name in russian cause compile error: 
 2.вквадрате (вквадрате(2))

save module as utf8(or any other enconding from list above) file, 
from your error description it is ascii

Jan 10 2013

"Andrey" <andr-sar yandex.ru> writes:

 save module as utf8(or any other enconding from list above) 
 file, from your error description it is ascii

I'm pretty sure I'm saving it in unicode. I can use all unicode 
chars easily in string literals ("x²") and output them to 
console. But using them in identifiers leads to compiler error.

Apart from that, try this code:

int в_квадрате(int num) { return num*num; }

writeln(2.в_квадрате);

You get: Error: found 'в_квадрате' when expecting ','

Jan 10 2013

"Andrey" <andr-sar yandex.ru> writes:

Forgot to mention. Linux 64 bit, D version 2.060

Jan 11 2013

"evilrat" <evilrat666 gmail.com> writes:

On Friday, 11 January 2013 at 07:47:03 UTC, Andrey wrote:
 Apart from that, try this code:

 int в_квадрате(int num) { return num*num; }

 writeln(2.в_квадрате);

 You get: Error: found 'в_квадрате' when expecting ','

don't have any errors with this code(dmd 2.061, win8)

but x² as identifier is really gives error. idk maybe it is a 
bug, or maybe not

Jan 11 2013

"H. S. Teoh" <hsteoh quickfur.ath.cx> writes:

On Fri, Jan 11, 2013 at 03:09:29AM +0100, Andrey wrote:
 Should these variants serve as identifiers?
 
 auto x²; //fails to compile: char 0x00b2 not allowed in identifier,
 unsupported char 0xb2 (why? is it not a digit?)

Weird, identifiers like "Цвет" and "張" and even "ℝ" all work fine, but
"⅀" doesn't work. Maybe it's a bug?


[...]
 Still, this function name in russian cause compile error: 2.вквадрате
 (вквадрате(2))

This works for me:

	import std.stdio;
	real плюс(real a, real b) { return a+b; }
	void main() {
		writeln(плюс(1.61803, 3.14159));
		writeln(1.61803.плюс(3.14159));
	}

Both writeln's print 4.75962. Are you sure you saved your source file in
UTF-8 format?


T

-- 
"I'm not childish; I'm just in touch with the child within!" - RL

Jan 10 2013

Jacob Carlborg <doob me.com> writes:

On 2013-01-11 03:09, Andrey wrote:
 Should these variants serve as identifiers?

 auto x²; //fails to compile: char 0x00b2 not allowed in identifier,
 unsupported char 0xb2 (why? is it not a digit?)

 Same for ⅀, ∫ and etc.

 Official documentations says:
 «
 D source text can be in one of the following formats:
 ASCII
 UTF-8
 UTF-16BE
 UTF-16LE
 UTF-32BE
 UTF-32LE
 »

 Math symbols could have a great use compare to just characters from
 other languages (who does code in Greek or Chinese?). Still, this
 function name in russian cause compile error: 2.вквадрате
(вквадрате(2))

According to the specification D doesn't necessarly support unicode 
identifiers:

"Identifiers start with a letter, _, or universal alpha, and are 
followed by any number of letters, _, digits, or universal alphas. 
Universal alphas are as defined in ISO/IEC 9899:1999(E) Appendix D. 
(This is the C99 Standard.) Identifiers can be arbitrarily long, and are 
case sensitive. Identifiers starting with __ (two underscores) are 
reserved."

http://dlang.org/lex.html#Identifier

-- 
/Jacob Carlborg

Jan 11 2013

"Andrey" <andr-sar yandex.ru> writes:

 According to the specification D doesn't necessarly support 
 unicode identifiers:

 "Identifiers start with a letter, _, or universal alpha, and 
 are followed by any number of letters, _, digits, or universal 
 alphas. Universal alphas are as defined in ISO/IEC 9899:1999(E) 
 Appendix D. (This is the C99 Standard.) Identifiers can be 
 arbitrarily long, and are case sensitive. Identifiers starting 
 with __ (two underscores) are reserved."

 http://dlang.org/lex.html#Identifier

http://www.algonet.se/~afb/d/universalalphas/universalalphas.html

I can't understand logic why there are such symbols allowed

µ·ʰʱʲʳʴʵʶʷʸʻʽʾʿˀˁːˑˠˡˢˣˤͺՙऽଽι‿⁀ℂℇℊℋℌℍℎℏℐℑℒℓℕ℘ℙℚℛℜℝℤΩℨKÅℬℭ℮ℯℰℱℳℴℵℶℷℸⅠⅡⅢⅣⅤⅥⅦⅧⅨⅩⅪⅫⅬⅭⅮⅯⅰⅱⅲⅳⅴⅵⅶⅷⅸⅹⅺⅻⅼⅽⅾⅿↀↁↂ々〆〇〡〢〣〤〥〦〧〨〩

and very useful math symbols completely ignored.

C++11 standard allows these:
²³⁴⁵⁶⁷⁸⁹₀₁₂₃₄₅₆₇₈₉

Annex E (normative)
Universal character names for identifier
characters
[charname]

E.1
Ranges of characters allowed
[charname.allowed]
00A8, 00AA, 00AD, 00AF, 00B2-00B5, 00B7-00BA, 00BC-00BE, 
00C0-00D6, 00D8-00F6, 00F8-00FF
0100-167F, 1681-180D, 180F-1FFF
200B-200D, 202A-202E, 203F-2040, 2054, 2060-206F
2070-218F, 2460-24FF, 2776-2793, 2C00-2DFF, 2E80-2FFF
3004-3007, 3021-302F, 3031-303F
3040-D7FF
F900-FD3D, FD40-FDCF, FDF0-FE44, FE47-FFFD
10000-1FFFD, 20000-2FFFD, 30000-3FFFD, 40000-4FFFD, 50000-5FFFD,
60000-6FFFD, 70000-7FFFD, 80000-8FFFD, 90000-9FFFD, A0000-AFFFD,
B0000-BFFFD, C0000-CFFFD, D0000-DFFFD, E0000-EFFFD

Jan 11 2013

"Regan Heath" <regan netmail.co.nz> writes:

On Fri, 11 Jan 2013 02:09:29 -0000, Andrey <andr-sar yandex.ru> wrote:

 Should these variants serve as identifiers?

See:
http://dlang.org/lex.html#Identifier

"Identifiers start with a letter, _, or universal alpha, and are followed  
by any number of letters, _, digits, or universal alphas. Universal alphas  
are as defined in ISO/IEC 9899:1999(E) Appendix D. (This is the C99  
Standard.) Identifiers can be arbitrarily long, and are case sensitive.  
Identifiers starting with __ (two underscores) are reserved."

Regan

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Jan 11 2013

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digitalmars.D.learn - Unicode symbols in the identifiers