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Defoma::Id - Defoma module to handle Id cache.
$Id = defoma_id_open_cache( suffix, package_name );
defoma_id_close_cache( id_object );
defoma_id_register(
id_object,
type => type,
font => font,
id => id,
priority => priority,
category => category,
origin => origin,
depend => depend,
hints => hints
);
defoma_id_unregister(
id_object,
type => type,
font => font,
id => id
);
@index = defoma_id_grep_cache(
id_object,
search-type,
id => id,
font => font,
type => type,
category => category,
depid => depid,
depfont => depfont
);
@hints = defoma_id_get_hints( id_object, index );
defoma_id_set( id_object, id, font, flag );
defoma_id_unset( id_object, id, font );
id-cache is sort of a database and its aim is to avoid name space conflict. Applications often access fonts through their identifiers, so it is desirable that one identifier point only one font. It is a difficult requirement for automatic configuration because it can easily happen that two or more fonts have the same identifier. Automatic configuration scripts can hardly detect which font is the best to be named the identifier, or even such a situation occur. Defoma::Id is help for this problem.
The rough flow of how Defoma::Id works is:
1. open an id-cache at
init
command of a Defoma-configuration script.
2. register identifier(s) of a font at
register
command of the script.
3. Defoma::Id looks up the id-cache to check if there's any other
font that has the same identifier, and calls back the script to make
the most appropriate font have the identifier, by do-install- command
and do-remove- command.
RealName
is a real name of a font and is usually taken from the FontName hint.
If you want to register a font to an id-cache, at least one RealName
must be registered. You can pass the hints to
options
when you register a RealName.
Alias
is another name of a font and is usually taken from the Alias hint.
You have to specify the RealName of the font with
origin
when you register an Alias.
Substituted
is yet another name of a font, but unlike Alias, it is not taken from the
hints of the font, nor directly registered to an id-cache by
Defoma-configuration scripts. It is rather taken from a subst-rule,
which is handled by Defoma::Subst module, and is registered by the module.
If you want a certain font to substitute for another id, you should
register the font (and its RealName) to a subst-cache. For more detail,
please refer the Defoma::Subst manpage.
These processes make only one, more appropriate font provide an certain id, so the name-space conflict would be avoided.
type represents the type of the entry in a combination of some letters. id-cache handles font entry and mark entry. The latter is used to have a certain less prior font installed for a certain id (i.e. marked as USE), or to keep a certain font from being installed for a certain id (i.e. marked as EXCLUDE), and is supposed to be set by users and not to be referred from Defoma-configuration scripts, just for internal use. On the other hand, font entry holds information of a certain id of a font and may be referred from the scripts.
type consists of two or three letters. The first letter represents the type of the entry and is either S or M (font entry or mark entry, respectively). If the first letter is S, which means it is font entry, the second letter represents the type of the font and is either r, a, S (real, alias or subst respectively). If the first letter is M, which means it is mark entry, the second letter represents the type of the mark and either of u or x (use or exclude respectively). If the entry is font entry, which means the first letter is S, and the font and the id of the entry is INSTALLED, there's a third letter and it is I.
depid and depfont represent dependency of the id of the font. The font never gets installed unless the depfont is installed for the depid. origin and depend arguments of defoma_id_register affect these items. If the id of the font doesn't depend on any other id and/or font, these items are set to '.'.
hints represents the hints of the id of the font. It is specified by hints argument of defoma_id_register. You must use defoma_id_get_hints to access the value of this item.
An item of each entry of an id-cache are accessible as an element of id-object whose key is e_id, e_font, e_type, e_priority, e_category, e_depid, e_depfont. For example, $Id->{e_font}->[3] accesses the font of entry #3 of id-object $Id.
Here's an example of an id-cache. # e_id e_font e_type e_priority e_category ... 0 Helvetica a.pfa SrI 20 type1 ... 1 Courier a.pfa Sa 20 type1 ... 2 Times-Roman b.ttf SrI 30 truetype ... 3 Courier b.ttf SaI 30 truetype ...It show a.pfa has two identifiers: Helvetica for RealName and Courier for Alias, and b.ttf has two identifiers: Times-Roman for RealName and Courier For Alias.
defoma_id_close_cache is a function used to close an id-cache. Internally it writes the content of an id-cache to the file which is identified by id_object.
defoma_id_register is a function used to register a font and one of its ids to an id-cache identified by id_object. You must at least pass type, font, id and priority as its arguments. type is either of 'real', 'alias' or 'subst', which corresponds to RealName, Alias or Substituted mentioned above, respectively. 'subst' should be specified only by Defoma::Subst module, so 'real' and 'alias' are possible choices. If 'alias' is specified as the type of a font, you must specify the RealName of the font by origin. Specifying the origin is required for non-RealName ids because they should not be installed unless the RealName of the font is installed. If 'real' is specified as the type, you can specify the hints of the font by hints.
defoma_id_unregister is a function used to unregister one or all registered id(s) of a certain font from and id-cache. If id is specified, only the id of the specified font is unregistered from the id-cache specified by id_object. Otherwise, all ids of the font are unregistered.
defoma_id_grep_cache is a function that searches the id-cache specified by id_object for the specified id/font/category/depid/depfont, and returns a list of indexes. search-type is either of real, alias, subst, font, installed or mark, which narrows down the subjects of searching. id ,font ,type ,category ,depid and depfont decides the subjects of searching more specifically. Not all of these, nor none of these are required.
defoma_id_get_hints is a function that returns hints of the index of the id-cache specified by id_object . If the index of Alias or Substituted is specified, it returns the hints of its RealName that is specified in the origin argument of defoma_id_register when the Alias/Substituted identifier was registered.
defoma_id_set is a function used to make the specified font provide the specified id, or to prevent the specified font from providing the specifid id. install or exclude may be given to the flag. defoma_id_unset is a function used to unset the set flag of the specified idandfont.
# Open an id-cache with 'test' as its suffix.
$Id = defoma_id_open_cache('test');
# register ids in register command.
my $font = shift;
my $h = parse_hints_start('Alias', @_);
my $fontname = $h->{FontName};
my @alias = split(/ /, $h->{Alias});
my $pri = $h->{Priority};
defoma_id_register($Id,
type => 'real',
font => $font,
id => $fontname,
priority => $pri,
hints => join(' ', @_));
foreach my $i (@alias) {
defoma_id_register($Id,
type => 'alias',
font => $font,
id => $i,
priority => $pri,
origin => $fontname);
}
# unregister ids.
defoma_id_unregister($Id, type => 'alias', font => $font);
defoma_id_unregister($Id, type => 'real', font => $font);
# close an id-cache
defoma_id_close_cache($Id);
# get a list of indexes of installed fonts that have
#'Helvetica' for the id.
my @list = defoma_id_grep_cache($Id, 'installed', id => 'Helvetica');
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