digitalmars.D.bugs - [Issue 3455] New: Some Unicode characters not allowed in identifiers
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http://d.puremagic.com/issues/show_bug.cgi?id=3455
Summary: Some Unicode characters not allowed in identifiers
Product: D
Version: unspecified
Platform: Other
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: DMD
AssignedTo: nobody puremagic.com
ReportedBy: andrei metalanguage.com
09:30:44 PDT ---
Consider:
void main() {
auto aλ = "９";
auto a９ = "９";
}
The first identifier is an "a" followed by this:
http://www.fileformat.info/info/unicode/char/03bb/index.htm
The second identifier is an "a" followed by this:
http://www.fileformat.info/info/unicode/char/ff19/index.htm
Both string literals contain the latter.
The second identifier does not compile, although I checked that my editor
inserted the correct three-byte UTF-8 code.
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Matti Niemenmaa <matti.niemenmaa+dbugzilla iki.fi> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |spec
CC| |matti.niemenmaa+dbugzilla i
| |ki.fi
Platform|Other |All
OS/Version|Linux |All
Severity|normal |enhancement
2009-10-30 09:51:09 PDT ---
As http://www.digitalmars.com/d/1.0/lex.html#identifier very clearly states,
the allowed characters in identifiers are those defined in the C99 standard,
ISO/IEC 9899:1999(E) Annex D. Have a look at it:
http://www.open-std.org/JTC1/SC22/wg14/www/docs/n1124.pdf
９, code point 0xff19, is not in that list. The maximum one is 0xd7a3, in
fact.
This is not a bug, this is an enhancement.
However, rather than an arbitrary and frozen list, I /would/ prefer basing it
simply on Unicode properties, such as Java's choice: identifiers may start with
letters or numeric letters, and may contain, in addition to those, connecting
punctuation, decimal digits, and combining and non-spacing marks. In other
words:
Identifiers may start with code points from the general categories Ll, Lm, Lo,
Lt, Lu, Nl.
Identifiers may contain code points from the general categories Ll, Lm, Lo, Lt,
Lu, Mc, Mn, Nd, Nl, No, Pc.
Java also allows Cc and Cf, of whose usefulness I'm not so convinced. These are
control characters and things like "soft hyphen", which isn't even supposed to
be displayed unless the word line-wraps. Too much potential for confusion IMHO.
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http://d.puremagic.com/issues/show_bug.cgi?id=3455 11:40:05 PDT ---As http://www.digitalmars.com/d/1.0/lex.html#identifier very clearly states, the allowed characters in identifiers are those defined in the C99 standard, ISO/IEC 9899:1999(E) Annex D. Have a look at it: http://www.open-std.org/JTC1/SC22/wg14/www/docs/n1124.pdf ９, code point 0xff19, is not in that list. The maximum one is 0xd7a3, in fact. This is not a bug, this is an enhancement. However, rather than an arbitrary and frozen list, I /would/ prefer basing it simply on Unicode properties, such as Java's choice: identifiers may start with letters or numeric letters, and may contain, in addition to those, connecting punctuation, decimal digits, and combining and non-spacing marks. In other words: Identifiers may start with code points from the general categories Ll, Lm, Lo, Lt, Lu, Nl. Identifiers may contain code points from the general categories Ll, Lm, Lo, Lt, Lu, Mc, Mn, Nd, Nl, No, Pc. Java also allows Cc and Cf, of whose usefulness I'm not so convinced. These are control characters and things like "soft hyphen", which isn't even supposed to be displayed unless the word line-wraps. Too much potential for confusion IMHO.Oh ok. Thanks Matti. I'm leaving this as an enhancement request. Currently the error message is: invalid UTF-8 sequence unsupported char 0x99 This is factually incorrect because the UTF-8 sequence is correct. I suggest instead: Unicode character 0xFF19 not allowed in a symbol Andrei -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: -------
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Walter Bright <bugzilla digitalmars.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |bugzilla digitalmars.com
00:17:37 PST ---
I'm slowly becoming convinced that allowing unicode characters in identifiers
is just a bad idea anyway. While there is plenty of interest in writing code
that manipulates unicode and has unicode strings, there is little interest in
writing the code itself in unicode. There's a growing consensus that code
should be written in ascii, for a long list of reasons.
For C compatibility, D should support the C identifiers, but I don't think
there's an advantage to going beyond that. For instance, the unicode character
used in Andrei's test case won't even display properly in Explorer.
I'll fix the error message, then call it resolved.
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Dec 12 2009
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Kosmonaut <Kosmonaut tempinbox.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |Kosmonaut tempinbox.com
---
[leandro]Relevant SVN commit:[/leandro]
http://www.dsource.org/projects/dmd/changeset/292
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Walter Bright <bugzilla digitalmars.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
11:11:58 PST ---
Fixed dmd 1.054 and 2.038
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Dec 31 2009
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Ali Cehreli <acehreli yahoo.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |acehreli yahoo.com
there is little interest in writing the code itself in unicode.
There's a growing consensus that code should be written in ascii,
for a long list of reasons.
Thank you very much for allowing us to program in UTF-8. There is a yet-to-grow
Turkish D community out there who have tremendous joy in being able to program
in Turkish.
I may be in the minority here, but UTF-8 identifiers has been the most
important feature for me to consider D.
Ali
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