/usr/share/texlive/texmf-dist/tex/plain/pitex/fonts.ptxlua is in texlive-plain-extra 2014.20141024-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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local function get_locals (tab)
local tb = {}
for lib, keys in pairs(tab) do
keys = string.explode(keys)
for _, k in ipairs(keys) do
tb[k] = _G[lib][k]
end
end
return tb
end
-- str
-- string manipulation
local str = get_locals {string = "explode gsub match format lower upper"}
-- Removes space at the beginning and end and conflates multiple spaces.
function str.trim (s)
s = str.match(s, "^%s*(.-)%s*$")
s = str.gsub(s, "%s+", " ")
return s
end
-- Extracts a pattern from a string, i.e. removes it and returns it.
-- If "full", then the entire pattern is removed, not only the captures.
function str.extract (s, pat, full)
local cap = str.match(s, pat)
if cap then
if full then
s = str.gsub(s, pat, "")
else
s = str.gsub(s, cap, "")
end
end
return cap, s
end
-- /str
-- lp
-- advanced string manipulation
lpeg.locale(lpeg)
local lp = get_locals {lpeg = "match P C S Ct V alnum"}
lp.space = lpeg.space^0
-- /lp
-- tab
-- table manipulation
local tab = get_locals {table = "insert remove sort"}
-- Adds val to tab, creating it if necessary.
function tab.update (tb, val)
tb = tb or {}
tab.insert(tb, val)
return tb
end
-- Adds subtable (empty, or val) to tb at entry key, unless it already exists.
function tab.subtable (tb, key, val)
tb[key] = tb[key] or val or {}
end
-- Writes a table to an extenal file.
local function write_key (key, ind)
return ind .. '["' .. key .. '"] = '
end
function tab.write (tb, f, ind)
for a, b in pairs (tb) do
if type(a) == "string" then
a = '"' .. a .. '"'
end
a = "[" .. a .. "]"
if type(b) == "table" then
f:write(ind, a, " = {")
tab.write(b, f, ind .. " ")
f:write(ind, "},")
else
if type(b) == "boolean" then
b = b and "true" or "false"
elseif type(b) == "string" then
b = '"' .. b .. '"'
end
f:write(ind, a, " = ", b, ",")
end
end
end
-- Returns a full copy of a table. Not copying of metatables necessary for the
-- moment.
function tab.copy (tb)
local t = {}
for k, v in pairs (tb) do
if type(v) == "table" then
v = tab.copy(v)
end
t[k] = v
end
return t
end
-- Sorts two tables containing modifiers (Italic, etc.).
function tab.sortmods (a, b)
local A, B = "", ""
for _, x in ipairs (a) do
A = A .. " " .. x
end
for _, x in ipairs (b) do
B = B .. " " .. x
end
return A < B
end
-- Turns an array into a hash.
function tab.tohash(tb)
local t = {}
for _, k in ipairs(tb) do
t[k] = true
end
return t
end
-- /tab
-- lfs
-- files etc.
local lfs = get_locals {lfs = "dir isdir isfile mkdir", kpse = "expand_var show_path find_file"}
-- Returns anything after the last dot, i.e. an extension.
function lfs.extension (s)
return str.lower(str.match(s, "%.([^%.]*)$"))
end
local extensions = {
otf = "opentype",
ttf = "truetype",
ttc = "truetype",
}
function lfs.type (s)
return extensions[lfs.extension(s)]
end
local kpse_extensions = {
otf = "opentype fonts",
ttf = "truetype fonts",
ttc = "truetype fonts",
}
function lfs.kpse (s)
return kpse_extensions[lfs.extension(s)]
end
-- Returns anything after the last slash, i.e. a pathless file.
function lfs.nopath (f)
return str.match(f, "[^/]*$")
end
-- Creates a directory; the arguments are the successive subdirectories.
function lfs.ensure_dir (...)
local arg, path = {...}
for _, d in ipairs(arg) do
if path then
path = path .. "/" .. d
else
path = d
end
path = str.gsub(path, "//", "/")
if not lfs.isdir(path) then
lfs.mkdir(path)
end
end
return path
end
-- Turns "foo/blahblah/../" into "foo/" (such going into and leaving
-- directories happens with kpse). Also puts everything to lowercase.
function lfs.smooth_file (f)
f = str.gsub(f, "/.-/%.%./", "/")
f = str.gsub(f, "^%a", str.lower)
return f
end
-- /lfs
-- wri
-- messages
local wri, write_nl = {}, texio.write_nl
function wri.report (s, ...)
write_nl(str.format(s, unpack(arg)))
end
function wri.error (s, ...)
tex.error(str.format(s, unpack(arg)))
end
-- /wri
-- various
-- the last one is, of course, not the least
local io = get_locals {io = "open lines"}
local os = get_locals {os = "date"}
local num = get_locals {math = "abs tan rad floor pi", tex = "sp"}
local fl = get_locals {fontloader = "open close to_table info", font = "read_tfm"}
-- /various
-- *** END OF UTILITY FUNCTIONS ***
--- *** CREATING THE LIBRARY *** ---
local settings
if lfs.find_file"foundry-settings.lua" then
settings = require"foundry-settings.lua"
else
settings = {normal = {}, features = {}}
end
local font_families = {}
local normal_names = {}
for _, name in ipairs(settings.normal) do
normal_names[name] = true
end
local local_path = lfs.expand_var("$TEXMFLOCAL")
local foundry_path = lfs.ensure_dir (local_path, "tex", "luatex", "foundry")
local library_file = foundry_path .. "/" .. "readable.txt"
--local library_file = "c:/texlive/texmf-local/tex/plain/pitex/readable.txt"
--local library_file = "readable.txt"
-- Analyze a font file and return a name and a table
-- with modifiers.
local function extract_font (file, names)
local fi, subname
-- Trying to open a font in ttc, using the names returned by fontloader.info
if names then
local name = names.fullname
if name then
fi = fl.open (file, name)
end
if not fi then
name = names.fontname
if name then
fi = fl.open
end
if not fi then
fl.error("Can't open %s", file)
return
end
end
subname = name
else
fi = fl.open(file)
end
-- Getting the most precise information. Not necessarily the best
-- solution, but since the user can modify the library, it's not so bad.
local fam, name = fi.names[1].names.preffamilyname or fi.names[1].names.family or fi.familyname, fi.fontname
local spec = fi.names[1].names.prefmodifiers or fi.names[1].names.subfamily or ""
local subfam, _spec
local t = { [0] = file }
-- Removing mods like Regular, Book, etc.
for name in pairs(normal_names) do
spec = str.gsub(spec, name, "")
end
if subname then
tab.insert(t, "[font = " .. subname .. "]")
end
if spec ~= "" then
spec = str.explode(spec)
for _, s in ipairs(spec) do
tab.insert(t, s)
end
end
fl.close(fi)
return fam, t
end
-- Searches directories for font files, and pass them to
-- extract_font. The fonts are collected in a table.
-- The fonts_done table is updated when the library is read,
-- so when a font is missing and one needs to recheck files,
-- only those that arent in the libraries are considered.
local fonts_done = {}
local function check_fonts (rep, tb)
for f in lfs.dir (rep) do
if f ~= "." and f ~= ".." then
f = str.gsub(rep, "/$", "") .. "/" .. f
if lfs.isdir(f) then
check_fonts(f, tb)
elseif lfs.isfile(f) and not fonts_done[lfs.nopath(f)] then
local e = lfs.extension(f)
if e == "ttf" or e == "otf" then
local fam, file = extract_font(f)
if fam then
tab.subtable(tb, fam)
tab.insert(tb[fam], file)
end
elseif e == "ttc" then
local info = fl.info(f)
for _, i in ipairs(info) do
local fam, file = extract_font(f, i)
if fam then
tab.subtable(tb, fam)
tab.insert(tb[fam], file)
end
end
end
end
end
end
end
-- Writes the library to an external file.
-- Type is "a" if what's going on is recheck_fonts.
local function write_lib (fams, file, type)
local read_table = {}
for fam, tb in pairs(fams) do
tab.insert(read_table, fam)
for _, ttb in ipairs(tb) do
tab.sort(ttb)
end
tab.sort(tb, tab.sortmods)
end
tab.sort(read_table)
local readable = io.open(file, type)
for n, fam in ipairs(read_table) do
local log
if type == "a" then
log = true
if n == 1 then
wri.report("\nAdding new font(s):")
readable:write("\n\n% Added automatically " .. os.date() .. "\n\n")
end
wri.report(fam)
end
readable:write(fam .. " :")
for n, f in ipairs(fams[fam]) do
log = log and " "
readable:write("\n ")
for _, t in ipairs(f) do
log = log and log .. " " .. t
readable:write(" " .. t)
end
log = log and log .. " " .. '"' .. f[0] .. '"'
readable:write(" " .. '"' .. lfs.nopath(f[0]) .. '",')
if log then wri.report(log) end
if n == #fams[fam] then
readable:write("\n\n")
end
end
end
readable:close()
end
-- If there is no library, we create it.
local font_paths = lfs.show_path("opentype fonts")
font_paths = str.gsub(font_paths, "\\", "/")
font_paths = str.gsub(font_paths, "/+", "/")
font_paths = str.gsub(font_paths, "!!", "")
font_paths = str.explode(font_paths, ";+")
if not lfs.find_file(library_file) then
wri.report("I must create the library; please wait, that can take some time.")
for _, rep in ipairs(font_paths) do
check_fonts(rep, font_families)
end
write_lib(font_families, library_file, "w")
end
-- Reads the library file, turning it into a table.
local explode_semicolon = lp.P{
lp.Ct(lp.V"data"^1),
data = lp.C(((1 - lp.S";[") + (lp.S"[" * (1 - lp.S"]")^0 * lp.S"]" ))^1) / str.trim * (lp.S";" + -1),
}
local explode_comma = lp.P{
lp.Ct(lp.V"data"^1),
data = lp.C(((1 - lp.S",[") + (lp.S"[" * (1 - lp.S"]")^0 * lp.S"]" ))^1) / str.trim * (lp.S"," + -1),
}
local function load_library (lib)
local LIB = ""
local lib_file = lfs.find_file(lib)
if not lib_file then
wri.error("I can't find library %s.", lib)
return
end
for l in io.lines(lib_file) do
if not str.match(l, "^%s*%%") then
if str.match(l, "^%s*$") then
LIB = LIB .. ";"
else
LIB = LIB .. " " .. l
end
end
end
LIB = str.gsub(LIB, ";%s*;", ";;")
LIB = str.gsub(LIB, ";+", ";")
LIB = str.gsub(LIB, "^;", "")
LIB = str.gsub(LIB, "%s+", " ")
LIB = lp.match(explode_semicolon, LIB)
local newlib = {}
for _, t in ipairs(LIB) do
local fam, files = str.match(t, "(.-):(.*)")
local current_mods
if files then
files = lp.match(explode_comma, files)
fam = str.explode(fam, ",")
local root
for n, f in ipairs (fam) do
f = str.trim(f)
if n == 1 then
root = f
if type(newlib[f]) == "string" then
wri.error("Name `%s' is already used as an alias for `%s'; it is now overwritten to denote a family", f, newlib[f])
newlib[f] = {}
else
newlib[f] = newlib[f] or {}
end
else
if newlib[f] then
wri.error("The name `%s' is already used. I ignore it as an alias for `%s'", f, root)
else
newlib[f] = root
end
end
end
for _, f in ipairs(files) do
local reset
reset, f = str.extract(f, "^%.%.", true)
if reset then current_mods = nil end
local mods, file, feats = str.match(f, '([^"]*)"(.*)"')
if mods then
fonts_done[lfs.nopath(file)] = true
feats, mods = str.extract(mods, "%[([^%]]-)]", true)
mods = str.explode(mods)
if current_mods then
for _, t in ipairs(current_mods) do
tab.insert(mods, t)
end
if current_mods.feats then
feats = feats or ""
feats = current_mods.feats .. "," .. feats
end
end
local sizes, real_mods = {}, {}
for n, s in ipairs(mods) do
if tonumber(s) then
tab.insert(sizes, tonumber(s))
else
tab.insert(real_mods, s)
end
end
sizes = #sizes > 0 and sizes or {0}
tab.sort(real_mods)
local T = newlib[root]
for _, t in ipairs(real_mods) do
t = str.trim(t)
if t ~= "" then
T[t] = T[t] or {}
T = T[t]
end
end
T.__files = T.__files or {}
for _, s in ipairs(sizes) do
T.__files[s] = {str.trim(file), feats}
end
else
feats, mods = str.extract(f, "%[([^%]]-)]", true)
if current_mods then
for _, mod in ipairs(str.explode(mods)) do
tab.insert(current_mods, mod)
end
if feats then
current_mods.feats = current_mods.feats and current_mods.feats .. "," .. feats or feats
end
else
current_mods = str.explode(mods)
current_mods.feats = feats
end
end
end
end
end
return newlib
end
local library = {}
library.default = load_library(library_file)
-- Same as above, but used when rechecking (if a font isn't found in libraries).
local function recheck_fonts ()
local tb = {}
for _, rep in ipairs(font_paths) do
check_fonts(rep, tb)
end
write_lib(tb, library_file, "a")
library.default = load_library(library_file)
end
-- This is public.
function new_library (lib)
local l = load_library(lib)
if l then
tab.insert(library, l)
end
end
--- *** END OF LIBRARY MANAGEMENT *** ---
--- *** FONT CREATION *** ---
-- Creates a new substitution for trep.
local function add_sub (f, num, sub)
num, sub = f.map.map[num], f.map.map[sub]
if f.glyphs[num] and f.glyphs[sub] then
local x = f.glyphs[num]
tab.subtable(x, "lookups")
x.lookups.tex_trep = { { type = "substitution", specification = {variant = f.glyphs[sub].name} } }
end
end
-- Creates a new ligature for tlig.
local function add_lig (f, lig, ...)
lig = f.map.map[lig]
if lig then
arg = {...}
local components
for _, c in ipairs(arg) do
c = f.map.map[c]
c = c and f.glyphs[c]
if c then
c = c.name
components = components and components .. " " .. c or c
else
components = nil
break
end
end
if components then
local x = f.glyphs[lig]
tab.subtable(x, "lookups")
tab.subtable(x.lookups, "tex_tlig")
tab.insert(x.lookups.tex_tlig, { type = "ligature",
specification = {char = x.name, components = components} })
end
end
end
-- Loops over all the constitutents of ligatures, creating intermediary
-- ligatures if necessary. E.g. "f f i" is broken into:
-- f + f = ff.lig
-- ff.lig + i = ffi.lig
-- Then when loading the font if the intermediary ligatures do not exist
-- (e.g. "1/" in "1 / 4") a phantom character is added to the font; which might
-- be dangerous (e.g. "1/" will create a node without character if no "4" follows).
-- The ".lig" suffix is arbitrary but all glyphs marked as ligatures are also registered
-- with such a name, so if there's an "f f" ligature in a font, no matter its name, "ff.lig"
-- will point to it.
local function ligature (comp, tb, phantoms)
local i = str.gsub(comp[1], "%.lig$", "") .. comp[2] .. ".lig"
phantoms[i] = true
tab.insert(tb.all_ligs, i)
tab.subtable(tb, comp[1])
tb[comp[1]][comp[2]] = { char = i, type = 0 } -- The type could be something else.
tab.remove(comp, 1)
tab.remove(comp, 1)
if #comp > 0 then
tab.insert(comp, 1, i)
ligature(comp, tb, phantoms)
end
end
local function get_lookups (t, lookup_table)
if t then
for _, tb in pairs(t) do
local _tb = { tags = {} }
if tb.features then
for _, feats in pairs(tb.features) do
local _tag = {}
if feats.scripts then
for _, scr in pairs(feats.scripts) do
_tag[scr.script] = {}
for _, lang in pairs(scr.langs) do
tab.insert (_tag[scr.script], str.trim(lang))
end
end
end
for _, sub in pairs(tb.subtables) do
tab.insert(_tb, sub.name)
end
_tb.tags[feats.tag] = _tag
end
end
if tb.name then
local tp = tb.type or "no_type"
tab.subtable(lookup_table, tp)
lookup_table[tp][tb.name] = _tb
end
end
end
end
function create_font (filename, extension, path, subfont, write)
local data = fl.open(filename, subfont)
fontfile = fl.to_table(data)
fl.close(data)
local lookups = {}
local name_touni = { }
local max_char = 0
for chr, gly in pairs(fontfile.map.map) do
max_char = chr > max_char and chr or max_char
-- Some glyphs have the same name in some fonts,
-- e.g. the several hyphens.
local name = fontfile.glyphs[gly].name
while name_touni[name] do
name = name .. "_"
end
name_touni[name] = chr
end
if fontfile.gsub then
tab.insert(fontfile.gsub,
{ type = "gsub_single",
name = "tex_trep",
subtables = { {name = "tex_trep"} },
features = { { tag = "trep"} } })
tab.insert(fontfile.gsub,
{ type = "gsub_ligature",
name = "tex_tlig",
subtables = { {name = "tex_tlig"} },
features = { { tag = "tlig"} } })
for _, tb in ipairs(fontfile.gsub) do
for __, ttb in ipairs(tb.subtables) do
if tb.type == "gsub_contextchain" then
lookups[tb.name] = lookups[tb.name] or { type = tb.type }
tab.insert(lookups[tb.name], ttb.name)
end
lookups[ttb.name] = { type = tb.type }
lookups["-" .. ttb.name] = { type = tb.type }
end
end
end
if fontfile.gpos then
for _, tb in ipairs(fontfile.gpos) do
for __, ttb in ipairs(tb.subtables) do
lookups[ttb.name] = { type = tb.type }
lookups["-" .. ttb.name] = { type = tb.type }
end
end
end
if fontfile.kerns then
for _, class in ipairs(fontfile.kerns) do
local max = 0
for a in pairs (class.seconds) do
max = max < a and a or max
end
if type(class.lookup) == "string" then
lookups[class.lookup] = { type = "gpos_pair", firsts = class.firsts, seconds = class.seconds, offsets = class.offsets, max = max}
else
for _, lk in ipairs(class.lookup) do
lookups[lk] = { type = "gpos_pair", firsts = class.firsts, seconds = class.seconds, offsets = class.offsets, max = max}
end
end
end
end
add_sub(fontfile, 96, 8216) -- ` to quoteleft
add_sub(fontfile, 39, 8217) -- ' to apostrophe (quoteright)
add_lig(fontfile, 8220, 8216, 8216) -- quoteleft + quoteleft to quotedblleft
add_lig(fontfile, 8221, 8217, 8217) -- quoteright + quoteright to quotedblright
add_lig(fontfile, 8211, 45, 45) -- -- to endash
add_lig(fontfile, 8212, 8211, 45) -- --- (i.e. endash + -) to emdash
add_lig(fontfile, 161, 63, 96) -- ?` to inverted question mark
add_lig(fontfile, 161, 63, 8216) -- The same, with `turned to quoteleft.
add_lig(fontfile, 191, 33, 96) -- !` to inverted exclamation mark
add_lig(fontfile, 191, 33, 8216) -- Idem.
local characters, phantom_ligatures = {}, {}
for chr, gly in pairs(fontfile.map.map) do
local glyph, char = fontfile.glyphs[gly], {}
char.index = gly
char.name = glyph.name
char.width = glyph.width
if glyph.boundingbox then
char.depth = -glyph.boundingbox[2]
char.height = glyph.boundingbox[4]
end
if glyph.italic_correction then
char.italic = glyph.italic_correction
elseif glyph.width and glyph.boundingbox then
char.italic = glyph.boundingbox[3] - glyph.width
end
tab.subtable(characters, chr)
characters[chr] = char
if glyph.lookups then
for lk, tb in pairs(glyph.lookups) do
local _lk = "-" .. lk
if lookups[lk] and lookups[_lk] then
for _, l in ipairs(tb) do
if l.type == "substitution" then
tab.subtable(lookups[lk], "pairs")
lookups[lk].pairs[glyph.name] = l.specification.variant
tab.subtable(lookups[_lk], "pairs")
lookups[_lk].pairs[l.specification.variant] = glyph.name
elseif l.type == "ligature" then
local comp, lig = str.explode(l.specification.components), l.specification.char
local lig = ""
for _, c in ipairs(comp) do
lig = lig .. c
end
tab.subtable(lookups, lk)
tab.subtable(lookups[lk], "ligs", {all_ligs = {}})
ligature(comp, lookups[lk].ligs, phantom_ligatures)
name_touni[lig .. ".lig"] = chr
end
end
end
end
end
if glyph.kerns then
for _, kern in pairs(glyph.kerns) do
local lks = type(kern.lookup) == "table" and kern.lookup or {kern.lookup}
for _, lk in ipairs(lks) do
tab.subtable(lookups[lk], "kerns")
tab.subtable(lookups[lk].kerns, glyph.name)
lookups[lk].kerns[glyph.name][kern.char] = kern.off
end
end
end
end
for lig in pairs(phantom_ligatures) do
if not name_touni[lig] then
max_char = max_char + 1
name_touni[lig] = max_char
characters[max_char] = {name = lig}
end
end
local lookup_table = {}
get_lookups(fontfile.gsub, lookup_table)
get_lookups(fontfile.gpos, lookup_table)
get_lookups(fontfile.lookups, lookup_table, true)
if fontfile.lookups then
for name, lk in pairs(fontfile.lookups) do
local tb, format = {}, lk.format
for _, rule in ipairs(lk.rules) do
local ttb = { lookups = rule.lookups }
for pos, seq in pairs(rule[format]) do
ttb[pos] = {}
for _, glyfs in ipairs(seq) do
glyfs = str.explode(glyfs)
glyfs = tab.tohash(glyfs)
tab.insert(ttb[pos], glyfs)
end
end
tab.insert(tb, ttb)
end
lookups[name] = tb
end
end
local loaded_font = {
direction = 0,
filename = filename,
format = extension,
fullname = fontfile.names[1].names.fullname,
name = fontfile.fontname,
psname = fontfile.fontname,
type = "real",
units_per_em = fontfile.units_per_em,
auto_expand = true,
cidinfo = fontfile.cidinfo,
-- Used only to adjust absoluteslant.
italicangle = -fontfile.italicangle,
name_to_unicode = name_touni,
max_char = max_char,
lookups = lookups,
lookup_table = lookup_table,
characters = characters
}
if write then
local f = io.open(path, "w")
f:write("return {")
tab.write(loaded_font, f, "\n")
f:write("}")
f:close()
end
return loaded_font
end
-- GETTING A FONT
-- Finds a font file, and returns the original
-- file and the Lua version.
local name_luafile, get_features
local function is_font (name, mods, size)
local lib, library_filename
for l, t in ipairs(library) do
if t[name] then
library_filename = t[name]
lib = t
break
end
end
if not library_filename then
library_filename = library.default[name]
lib = library.default
end
if library_filename then
if type(library_filename) == "string" then
library_filename = lib[library_filename]
end
tab.sort(mods)
local T = library_filename
for _, t in ipairs(mods) do
local found
for tag in pairs(T) do
if str.match(tag, "^" .. t) then
T = T[tag]
found = true
break
end
end
if not found then
T = nil
break
end
end
if T and T.__files then
local file, feats
local diff = 10000
for s, f in pairs(T.__files) do
if num.abs(s - size) < diff then
diff = num.abs(s - size)
file, feats = f[1], f[2]
end
end
file, _file = lfs.find_file(file, lfs.kpse(file)), file
if file then
file = str.gsub(file, "\\", "/")
else
return 1, _file
end
local features = {}
if feats then
get_features(feats, features)
end
local lua = name_luafile(file, features.font)
lua = lfs.isfile(lua) and lua
return file, lua, feats
end
end
end
-- Returns the full path to the Lua version of the font.
-- "sub" is a font in ttc.
function name_luafile (file, sub)
local lua
sub = sub and "_" .. sub or ""
sub = str.gsub(sub, " ", "_")
if str.match(file, "/") then
lua = str.match(file, ".*/(.-)%....$")
else
lua = str.match(file, "(.-)%....$")
end
lua = lua .. sub
return foundry_path .. "/" .. lua .. ".lua"
end
local function apply_size (font, size, letterspacing, parameters)
if (size < 0) then size = (- 655.36) * size end
local to_size = size / font.units_per_em
font.size = size
font.designsize = size
font.to_size = to_size
local italic = font.italicangle or 0
local space, stretch, shrink, extra
if parameters == "mono" then -- Creates a monospaced font with space equal to the
-- width of an "m" and no stretch or shrink.
space = font.characters[109].width * to_size
stretch, shrink, extra = 0, 0, 0
else
parameters = parameters and str.explode(parameters) or {}
space = (parameters[1] or 0.25) * size
stretch = (parameters[2] or 0.166666) * size
shrink = (parameters[3] or 0.111111) * size
extra = (parameters[4] or 0.111111) * size
end
font.parameters = {
slant = size * num.floor(num.tan(italic * num.pi/180)), -- \fontdimen 1
space = space, -- \fontdimen 2
space_stretch = stretch, -- \fontdimen 3
space_shrink = shrink, -- \fontdimen 4
x_height = size * 0.4, -- \fontdimen 5
quad = size, -- \fontdimen 6
extra_space = extra -- \fontdimen 7
}
letterspacing = letterspacing or 1
for c, t in pairs(font.characters) do
if t.width then
t.width, t.height, t.depth = t.width * to_size * letterspacing, t.height * to_size, t.depth * to_size
t.expansion_factor = 1000
if t.italic then
t.italic = t.italic * to_size
end
end
end
return font
end
local get_mods = lp.Ct((lp.space * lp.S"/" * lp.C(lp.alnum^1))^0)
local get_feats = lp.Ct((lp.C((1 - lp.S",;")^1) * (lp.S",;" + -1))^1)
function get_features (features, tb)
features = lp.match(get_feats, features) or {}
for _, f in ipairs(features) do
if str.match(f, "=") then
local key, val = str.match(f, "%s*(.-)%s*=%s*(.*)")
val = str.trim(val)
if val == "false" then
tb[key] = nil
else
tb[key] = val
end
else
f = str.trim(f)
neg, f = str.extract(f, "^%-")
if neg then
tb[f] = nil
else
_, f = str.extract(f, "^%+")
tb[f] = true
end
end
end
end
local lookup_functions = {}
function lookup_functions.gsub_single (tb, f)
local name_touni = f.name_to_unicode
for a, b in pairs(tb.pairs) do
local _a, _b = name_touni[a], name_touni[b]
f.max_char = f.max_char + 1
f.characters[f.max_char] = f.characters[_a]
f.characters[_a] = f.characters[_b]
name_touni[a], name_touni[b] = f.max_char, _a
end
return f
end
function lookup_functions.gsub_ligature (tb, f)
local name_touni = f.name_to_unicode
tb.ligs.all_ligs = nil
for a, tb in pairs(tb.ligs) do
a = name_touni[a]
tab.subtable(f.characters[a], "ligatures")
for b, ttb in pairs(tb) do
b, c = name_touni[b], name_touni[ttb.char]
f.characters[a].ligatures[b] = {char = c, type = ttb.type}
end
end
return f
end
local function kern_pairs (tb, firsts, seconds, offset)
for _, c1 in ipairs(str.explode(firsts)) do
for __, c2 in ipairs(str.explode(seconds)) do
tab.subtable(tb, c1)
tb[c1][c2] = offset
end
end
end
local function kern_classes (firsts, seconds, offsets, max)
local kerns = {}
for f, F in pairs (firsts) do
for s, S in pairs (seconds) do
local off = offsets[(f-1) * max + s]
if off then
kern_pairs (kerns, F, S, off)
end
end
end
return kerns
end
local function apply_kerns (f, kerns, to_size)
local name_touni = f.name_to_unicode
to_size = to_size or 1
for c1, ttb in pairs(kerns) do
for c2, off in pairs(ttb) do
tab.subtable(f.characters[name_touni[c1]], "kerns")
f.characters[name_touni[c1]].kerns[name_touni[c2]] = off * to_size
end
end
end
function lookup_functions.gpos_pair (tb, f)
-- These are the big kern classes.
if tb.offsets then
local name_touni = f.name_to_unicode
for n, off in pairs(tb.offsets) do
tb.offsets[n] = off * f.to_size
end
local kerns = kern_classes(tb.firsts, tb.seconds, tb.offsets, tb.max)
apply_kerns(f, kerns)
end
-- These are the ones retrieved from individual glyphs.
if tb.kerns then
apply_kerns(f, tb.kerns, f.to_size)
end
return f
end
function lookup_functions.gsub_contextchain (tb, f)
local name_touni = f.name_to_unicode
local T = f.contextchain or {}
for _, llk in ipairs(tb) do
if fontfile.lookups then
local sub, Sub = fontfile.lookups[llk].rules[1].lookups
local chain = fontfile.lookups[llk].rules[1].coverage
local cur, current = str.explode(chain.current[1]), {}
local aft, after = chain.after and str.explode(chain.after[1]) or {}, {}
for _, c in ipairs(cur) do
c = name_touni[c]
if sub then
Sub = {}
for n, x in ipairs(sub) do
Sub[n] = name_touni[fontfile.glyphs[f.characters[c].index].lookups[x .. "_s"][1].specification.variant]
end
end
local t = { lookup = Sub}
tab.subtable(T, C)
for __, a in ipairs(aft) do
tab.subtable(t, "after")
t.after[name_touni[a]] = true
end
tab.insert(T[c], t)
end
end
end
f.contextchain = T
return f
end
local function _isactive (tb, ft, sc, lg)
for t in pairs(tb.tags) do
if ft[t] then
if t[sc] then
for _, lang in pairs(tb[sc]) do
if lang == lg then
return true
end
end
else
return true
end
end
end
end
local lookup_types = {
"gsub_single",
"gsub_ligature",
"gpos_pair"
}
local function activate_lookups (font, features, script, lang)
for _, type in ipairs(lookup_types) do
if font.lookup_table and font.lookup_table[type] then
for l, tb in pairs(font.lookup_table[type]) do
if _isactive(tb, features, script, lang) then
for _, lk in ipairs(tb) do
local lt = font.lookups[lk]
if lt then
font = lookup_functions[type](lt, font)
end
end
end
end
end
end
return font
end
local function load_font (name, size, id, done)
local loaded_font = lfs.find_file(name, "tfm")
if loaded_font then
loaded_font = fl.read_tfm(loaded_font, size)
else
local original = str.trim(str.match(name, "[^:]*"))
local family, mods, feats
family, name = str.extract(name, "([^/:]*)")
family = str.trim(family)
mods, name = str.extract(name, "[^:]*")
mods = lp.match(get_mods, mods) or {}
feats = str.extract(name, ":(.*)") or ""
local features = tab.copy(settings.features)
get_features(feats, features)
local at_size
if features.size then
at_size = features.size
else
at_size = size
at_size = at_size > 0 and at_size or at_size * - 655.36
at_size = at_size / 65536
end
local source, lua, add_feats = is_font(family, mods, at_size)
if add_feats then get_features(add_feats, features) end
if type(source) == "string" then
local cache = features.cache or "yes"
if lua then
if cache == "no" or cache == "rewrite" then
loaded_font = create_font(source, lfs.type(source), lua, features.font, cache == "rewrite")
else
loaded_font = dofile(lua)
end
else
lua = name_luafile(source, features.font)
loaded_font = create_font(source, lfs.type(source), lua, features.font, cache ~= "no")
end
else
if not done then
if type(source) == "number" then
wri.error("The library says `%s' matches `%s', but I can't find that file anywhere. Clean up your library!", original, lua)
else
recheck_fonts()
return load_font(original, size, id, true)
end
else
wri.error("I can't find `%s'. I return a default font to avoid further errors.", original)
end
end
if loaded_font then
local expansion = features.expansion and str.explode(features.expansion) or {}
loaded_font.stretch = expansion[1] or 0
loaded_font.shrink = expansion[2] or 0
loaded_font.step = expansion[3] or 0
local extend = features.extend or 1
loaded_font.extend = extend * 1000
local slant
if features.absoluteslant then
local italic = loaded_font.italicangle or 0
slant = features.absoluteslant - italic
else
slant = features.slant or 0
end
loaded_font.slant = num.tan(num.rad(slant)) * 1000
loaded_font = apply_size(loaded_font, size, features.letterspacing, features.space)
loaded_font = activate_lookups(loaded_font, features, features.script, features.lang)
loaded_font.name = loaded_font.name .. id
loaded_font.fullname = loaded_font.fullname .. id
local embedding = features.embedding or "subset"
if embedding ~= "no" and embedding ~= "subset" and embedding ~= "full" then
wri.error("Invalid value `%s' for the `embedding' feature. Value should be `no', `subset' or `full'.", embedding)
embedding = "subset"
end
loaded_font.embedding = embedding
else
loaded_font = fl.read_tfm(lfs.find_file("cmr10", "tfm"), size)
end
end
return loaded_font
end
callback.register("define_font", load_font)
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