Difference between revisions of "Internationalization/locale"

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(→‎References and useful links)
 
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== Format of locale on OS's ==
 
== Format of locale on OS's ==
−
* windows (for unmanaged code): hexadecimal code consisting of a language code (lower 10 bits) and culture code (upper bits), aka Locale Identifier (LCID)
+
* windows: hexadecimal code consisting of a language code (lower 10 bits) and culture code (upper bits), aka Locale Identifier (LCID). Note: the LCID is the same for different variants of language like Norwegian (Bokmal) and Norwegian (Nynorsk) (they use the same locale settings)
 +
 
 
* linux, unix: defined as [language[_territory][.codeset][@modifier]]
 
* linux, unix: defined as [language[_territory][.codeset][@modifier]]
  
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The LCID for "Language for non-Unicode programs" (aka system locale) can be found in the windows registry.<br>
 
The LCID for "Language for non-Unicode programs" (aka system locale) can be found in the windows registry.<br>
 
The LCID of "standards and formats" (aka user locale) doesn't seem to be in the registry nor in the environment variables of windows.
 
The LCID of "standards and formats" (aka user locale) doesn't seem to be in the registry nor in the environment variables of windows.
 +
There are some macros defined in windows.h that help getting these values.
  
 
== How to access to locale ==
 
== How to access to locale ==
 
=== Linux ===
 
=== Linux ===
 +
The function "get" that fetches the language environment variable (LANG) can be found in class EXECUTION_ENVIRONMENT
 +
 +
SHARED_EXEC_ENVIRONMENT: located [https://eiffelsoftware.origo.ethz.ch/svn/es/branches/soft-arch/Src/Eiffel/eiffel/shared/shared_exec_environment.e here]
  
 
=== Windows ===
 
=== Windows ===
 
In Eiffel there exist a "locale_id" in class WEL_COMPARE_ITEM_STRUCT that uses the macro MAKELCID to get the locale identifier (aka LCID) from the language id.
 
In Eiffel there exist a "locale_id" in class WEL_COMPARE_ITEM_STRUCT that uses the macro MAKELCID to get the locale identifier (aka LCID) from the language id.
−
SUBLANGID takes a language id and returns a sublanguage id like SUBLANG_ITALIAN_SWISS.
 
−
PRIMARYLANGID takes a language id and returns a primary language id like SUBLANG_ITALIAN.
 
  
  
 
Two solutions:<br>
 
Two solutions:<br>
−
* Find out how to get the language id
+
* Get the language id
 
* Use the locale id (convenient if SortID is needed)
 
* Use the locale id (convenient if SortID is needed)
 +
in both cases the solution can be found the macros of windows.h
  
  
−
Notes:
+
Notes:<br>
 
Locale id is formed by SortID and LanguageID.<br>
 
Locale id is formed by SortID and LanguageID.<br>
−
SortID contains info on the language encoding (?) like japanese unicode order, japanese XJIS order, chinese unicode order, chinese BIG5 order,...
+
SortID contains info on the language encoding (?) like japanese unicode order, japanese XJIS order, chinese unicode order, chinese BIG5 order,...<br>
−
As one of the predefined LCIDs there is LOCALE_USER_DEFAULT. Problem: what's his hexadecimal code?<br>
+
 
Macros for windows are contained in "windows.h".
 
Macros for windows are contained in "windows.h".
  
  
−
'''Found the macro needed: GetUserDefaultLCID()'''
+
'''Needed macro (the one that gets the user LCID): GetUserDefaultLCID()'''
 +
 
 +
 
 +
The code looks like this:
  
 +
<code>[eiffel,N]
 +
language_id: NATURAL_32 is
 +
external
 +
"C inline use <windows.h>"
 +
alias
 +
"return GetUserDefaultLCID();"
 +
end
 +
</code>
  
−
The code should then look like this:
+
== OS detection ==
−
language_id: INTEGER is
+
Queries for OS detection cam be found in class PLATFORM
−
<br> -- `GetUserDefaultLCID' C encapsulation.
+
−
<br> external
+
−
<br> "C [macro %"windows.h%"] : EIF_INTEGER"
+
−
<br> -- the macro gives an output of type LCID, ie EIF_INTEGER needs to be changed accordingly if possible
+
−
<br> alias
+
−
<br> "GetUserDefaultLCID"
+
−
<br> end
+
  
 
== References and useful links ==
 
== References and useful links ==
−
* [http://www-950.ibm.com/software/globalization/icu/demo/locales info] about what's contained in a locale (language codes, time format,...)
+
* [http://www.unicode.org/cldr/apps/survey CLDR Survey Tool] Contains info about what a locale can refer to (e.g. language codes, time format, ...)
−
* [http://en.wikipedia.org/wiki/Date_and_time_notation_by_country date and time notations]
+
* [http://www.unicode.org/cldr/ Common Locale Data Repository] main page
 +
* [http://en.wikipedia.org/wiki/Date_and_time_notation_by_country Date and time notations]
 
* [http://en.wikipedia.org/wiki/Locale Locale on wikipedia]
 
* [http://en.wikipedia.org/wiki/Locale Locale on wikipedia]

Latest revision as of 23:12, 2 November 2008


In computing, locale is a set of parameters that defines the user's language, country and any special variant preferences that the user wants to see in their user interface.

Format of locale on OS's

  • windows: hexadecimal code consisting of a language code (lower 10 bits) and culture code (upper bits), aka Locale Identifier (LCID). Note: the LCID is the same for different variants of language like Norwegian (Bokmal) and Norwegian (Nynorsk) (they use the same locale settings)
  • linux, unix: defined as [language[_territory][.codeset][@modifier]]

Where to find locale

Linux

the environment variable is LANG

here is a list for more specific variables:

Locale category Application
LC_COLLATE Collation of strings (sort order.)
LC_CTYPE Classification and conversion of characters.
LC_MESSAGES Translations of yes and no.
LC_MONETARY Format of monetary values.
LC_NUMERIC Format of non-monetary numeric values.
LC_TIME Date and time formats.
LC_ALL Sets all of the above (overrides all of them.)
LANG Sets all the categories, but can be overridden by the individual locale categories.

Windows

The LCID for "Language for non-Unicode programs" (aka system locale) can be found in the windows registry.
The LCID of "standards and formats" (aka user locale) doesn't seem to be in the registry nor in the environment variables of windows. There are some macros defined in windows.h that help getting these values.

How to access to locale

Linux

The function "get" that fetches the language environment variable (LANG) can be found in class EXECUTION_ENVIRONMENT

SHARED_EXEC_ENVIRONMENT: located here

Windows

In Eiffel there exist a "locale_id" in class WEL_COMPARE_ITEM_STRUCT that uses the macro MAKELCID to get the locale identifier (aka LCID) from the language id.


Two solutions:

  • Get the language id
  • Use the locale id (convenient if SortID is needed)

in both cases the solution can be found the macros of windows.h


Notes:
Locale id is formed by SortID and LanguageID.
SortID contains info on the language encoding (?) like japanese unicode order, japanese XJIS order, chinese unicode order, chinese BIG5 order,...
Macros for windows are contained in "windows.h".


Needed macro (the one that gets the user LCID): GetUserDefaultLCID()


The code looks like this: 

language_id: NATURAL_32 is
	external
		"C inline use <windows.h>"
	alias
		"return GetUserDefaultLCID();"
	end

OS detection

Queries for OS detection cam be found in class PLATFORM

References and useful links

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