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))

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

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

> 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 ','

Forgot to mention. Linux 64 bit, D version 2.060

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

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

> 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

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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