[Bug 18726] New: RFE: help write locale-specific tests

http://bugs.freedesktop.org/show_bug.cgi?id=18726

Summary: RFE: help write locale-specific tests
           Product: fontconfig
           Version: 2.6
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: medium
         Component: library
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]
                CC: [e-mail]

Due to Han unification there is often a need for font distributors to test if a
font name is requested in a chinese, japanese or korean context. However, there
are many chinese locales and writing an exact match is not possible.

The current pattern (used by Debian, Ubuntu, Fedora, etc) in this case is

<test compare="contains" name="lang">
   <string>zh</string>
</test>

but we do not really want to match every locale containing "ze". We want to
match every ze-foo locale, not jze-foo or foo-ze

Please add a documented fonts.conf pattern to fontconfig that allows
distributors to specify such an exact match.

[Bug 18726] RFE: help write locale-specific tests

https://bugs.freedesktop.org/show_bug.cgi?id=18726

Akira TAGOH  changed:

What    |Removed                     |Added
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         AssignedTo|[e-mail]           |[e-mail]
                   |                            |esktop.org
          QAContact|                            |[e-mail]
                 CC|                            |[e-mail]

[Bug 18726] RFE: help write locale-specific tests

https://bugs.freedesktop.org/show_bug.cgi?id=18726

--- Comment #1 from Akira TAGOH  2012-04-24 02:55:12 PDT ---
lang-matching rule isn't necessarily based on the string comparison. when using
"eq" operator, the mapping table in FcLangSet is compared as long as the lang
matches to what fontconfig has as the orthography files. otherwise the string
comparison is used for last resort.  When using "contains" operator, the
minimal requirements in the mapping tables are compared if it's provided as the
orthography files. otherwise the string comparison is used though, it still
matches even if only one of values contains the territory but not in other.
e.g. "contains" operator considers "en" matches "en-us" and vice versa.

So what you need to do for:

(In reply to comment #0)
> but we do not really want to match every locale containing "ze". We want to
> match every ze-foo locale, not jze-foo or foo-ze

is:

<test name="lang" compare="contains">
    <string>ze</string>
  </test>

in that case. "contains" may still helps if any apps adds the lang from current
locale with ll-cc but the orth file is ll.orth.

[Bug 18726] RFE: help write locale-specific tests

https://bugs.freedesktop.org/show_bug.cgi?id=18726

Akira TAGOH  changed:

What    |Removed                     |Added
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             Status|NEW                         |ASSIGNED
         AssignedTo|[e-mail] |[e-mail]
                   |esktop.org                  |
                 CC|                            |[e-mail]
                   |                            |esktop.org

--- Comment #2 from Akira TAGOH  2012-04-24 03:13:42 PDT ---
Added an example:
http://cgit.freedesktop.org/~tagoh/fontconfig/commit/?h=bz18726

Please review.

[Bug 18726] RFE: help write locale-specific tests

https://bugs.freedesktop.org/show_bug.cgi?id=18726

Akira TAGOH  changed:

What    |Removed                     |Added
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             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED

--- Comment #3 from Akira TAGOH  2012-06-21 22:33:00 PDT ---
Added some comments about compare stuff and committed into git master.