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#!/usr/bin/env texlua
-----------------------------------------------------------------------
-- FILE: luaotfload-resolvers.lua
-- USAGE: ./luaotfload-resolvers.lua
-- DESCRIPTION: Resolvers for hooking into the fontloader
-- REQUIREMENTS: Luaotfload and a decent bit of courage
-- AUTHOR: Philipp Gesang (Phg), <phg@phi-gamma.net>
-----------------------------------------------------------------------
--
--- The bare fontloader uses a set of simplistic file name resolvers
--- that must be overloaded by the user (i. e. us).
if not lualibs then error "this module requires Luaotfload" end
if not luaotfload then error "this module requires Luaotfload" end
--[[doc--
Relying on the \verb|name:| resolver for everything has been the
source of permanent trouble with the database.
With the introduction of the new syntax parser we now have enough
granularity to distinguish between the \XETEX emulation layer and
the genuine \verb|name:| and \verb|file:| lookups of \LUATEX-Fonts.
Another benefit is that we can now easily plug in or replace new
lookup behaviors if necessary.
The name resolver remains untouched, but it calls
\luafunction{fonts.names.resolve()} internally anyways (see
\fileent{luaotfload-database.lua}).
--doc]]--
local next = next
local kpsefind_file = kpse.find_file
local lfsisfile = lfs.isfile
local stringlower = string.lower
local stringformat = string.format
local filesuffix = file.suffix
local fileremovesuffix = file.removesuffix
local luatexbase = luatexbase
local logreport = luaotfload.log.report
--[[doc--
\identifier{luaotfload} promises easy access to system fonts.
Without additional precautions, this cannot be achieved by
\identifier{kpathsea} alone, because it searches only the
\fileent{texmf} directories by default.
Although it is possible for \identifier{kpathsea} to include extra
paths by adding them to the \verb|OSFONTDIR| environment variable,
this is still short of the goal »\emphasis{it just works!}«.
When building the font database \identifier{luaotfload} scans
system font directories anyways, so we already have all the
information for looking sytem fonts.
With the release version 2.2 the file names are indexed in the
database as well and we are ready to resolve \verb|file:| lookups
this way.
Thus we no longer need to call the \identifier{kpathsea} library in
most cases when looking up font files, only when generating the
database, and when verifying the existence of a file in the
\fileent{texmf} tree.
--doc]]--
local resolve_file
resolve_file = function (specification)
local name = fonts.names.lookup_font_file (specification.name)
local suffix = filesuffix (name)
if fonts.formats[suffix] then
specification.forced = stringlower (suffix)
specification.forcedname = fileremovesuffix(name)
else
specification.name = name
end
end
--[[doc--
Prior to version 2.2, \identifier{luaotfload} did not distinguish
\verb|file:| and \verb|path:| lookups, causing complications with
the resolver.
Now we test if the requested name is an absolute path in the file
system, otherwise we fall back to the \verb|file:| lookup.
--doc]]--
local resolve_path
resolve_path = function (specification)
local name = specification.name
local exists, _ = lfsisfile(name)
if not exists then -- resort to file: lookup
logreport ("log", 0, "load",
"path lookup of %q unsuccessful, falling back to file:",
name)
resolve_file (specification)
else
local suffix = filesuffix (name)
if fonts.formats[suffix] then
specification.forced = stringlower (suffix)
specification.name = fileremovesuffix(name)
specification.forcedname = name
else
specification.name = name
end
end
end
--[[doc--
The \verb|name:| resolver.
--doc]]--
--- fonts.names.resolvers.name -- Customized version of the
--- generic name resolver.
local resolve_name
resolve_name = function (specification)
local resolver = fonts.names.lookup_font_name_cached
if config.luaotfload.run.resolver == "normal" then
resolver = fonts.names.lookup_font_name
end
local resolved, subfont = resolver (specification)
if resolved then
logreport ("log", 0, "load", "Lookup/name: %q -> \"%s%s\"",
specification.name,
resolved,
subfont and stringformat ("(%d)", subfont) or "")
specification.resolved = resolved
specification.sub = subfont
specification.forced = stringlower (filesuffix (resolved) or "")
specification.forcedname = resolved
specification.name = fileremovesuffix (resolved)
else
resolve_file (specification)
end
end
--[[doc--
We classify as \verb|anon:| those requests that have neither a
prefix nor brackets. According to Khaled\footnote{%
% XXX dead link‽
\url{https://github.com/phi-gamma/luaotfload/issues/4#issuecomment-17090553}.
}
they are the \XETEX equivalent of a \verb|name:| request, so we
will be treating them as such or, at least, in a similar fashion.
Not distinguishing between “anon” and “name” requests has a serious
drawback: The syntax is overloaded for requesting fonts in
\identifier{Type1} (\abbrev{tfm}, \abbrev{ofm}) format.
These are essentially \verb|file:| lookups and must be caught
before the \verb|name:| resolver kicks in, lest they cause the
database to update.
Even if we were to require the \verb|file:| prefix for all
\identifier{Type1} requests, tests have shown that certain fonts
still include further fonts (e.~g. \fileent{omlgcb.ofm} will ask
for \fileent{omsecob.tfm}) \emphasis{using the old syntax}.
For this reason, we introduce an extra check with an early return.
--doc]]--
local type1_formats = { "tfm", "ofm", "TFM", "OFM", }
local resolve_anon
resolve_anon = function (specification)
local name = specification.name
for i=1, #type1_formats do
local format = type1_formats[i]
local suffix = filesuffix (name)
if resolvers.findfile(name, format) then
local usename = suffix == format and fileremovesuffix (name) or name
specification.forcedname = file.addsuffix (usename, format)
specification.forced = format
return
end
end
--- under some weird circumstances absolute paths get
--- passed to the definer; we have to catch them
--- before the name: resolver misinterprets them.
name = specification.specification
local exists, _ = lfsisfile(name)
if exists then --- garbage; we do this because we are nice,
--- not because it is correct
logreport ("log", 1, "load", "file %q exists", name)
logreport ("log", 1, "load",
"... overriding borked anon: lookup with path: lookup")
specification.name = name
resolve_path (specification)
return
end
resolve_name (specification)
end
--[[doc--
{\bfseries EXPERIMENTAL}:
\identifier{kpse}-only resolver, for those who can do without
system fonts.
--doc]]--
local resolve_kpse
resolve_kpse = function (specification)
local name = specification.name
local suffix = filesuffix (name)
if suffix and fonts.formats[suffix] then
name = fileremovesuffix (name)
if resolvers.findfile (name, suffix) then
specification.forced = stringlower (suffix)
specification.forcedname = name
return
end
end
for t, format in next, fonts.formats do --- brute force
if kpsefind_file (name, format) then
specification.forced = t
specification.name = name
return
end
end
end
--[[doc--
Also {\bfseries EXPERIMENTAL}: custom file resolvers via callback.
--doc]]--
local resolve_my = function (specification)
luatexbase.call_callback ("luaotfload.resolve_font", specification)
end
return {
init = function ( )
if luatexbase and luatexbase.create_callback then
luatexbase.create_callback ("luaotfload.resolve_font",
"simple", function () end)
end
logreport ("log", 5, "resolvers", "installing font resolvers", name)
local request_resolvers = fonts.definers.resolvers
request_resolvers.file = resolve_file
request_resolvers.name = resolve_name
request_resolvers.anon = resolve_anon
request_resolvers.path = resolve_path
request_resolvers.kpse = resolve_kpse
request_resolvers.my = resolve_my
fonts.formats.ofm = "type1"
fonts.encodings = fonts.encodings or { }
fonts.encodings.known = fonts.encodings.known or { }
return true
end, --- [.init]
}
--- vim:ft=lua:ts=8:sw=4:et
|
