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if not modules then modules = { } end modules ['font-aux'] = {
version = 1.001,
comment = "companion to font-ini.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local tonumber, type, next = tonumber, type, next
----- wrap, yield = coroutine.wrap, coroutine.yield
local fonts, font = fonts, font
local fonts = fonts
local handlers = fonts.handlers
local otf = handlers.otf -- brrr
local afm = handlers.afm -- brrr
local iterators = { }
fonts.iterators = iterators
local currentfont = font.current
local identifiers = fonts.hashes.identifiers
local sortedkeys = table.sortedkeys
-- for unicode, character in fonts.iterators.characters () do print(unicode) end
-- for unicode, description in fonts.iterators.descriptions() do print(unicode) end
-- for index, glyph in fonts.iterators.glyphs () do print(index ) end
local function dummy() end
local function checkeddata(data) -- beware, nullfont is the fallback in identifiers
local t = type(data)
if t == "table" then
return data
elseif t ~= "number" then
data = currentfont()
end
return identifiers[data] -- has nullfont as fallback
end
local function getindices(data)
data = checkeddata(data)
local indices = { }
local characters = data.characters
if characters then
for unicode, character in next, characters do
indices[character.index or unicode] = unicode
end
end
return indices
end
-- function iterators.characters(data)
-- data = checkeddata(data)
-- local characters = data.characters
-- if characters then
-- local collected = sortedkeys(characters)
-- return wrap(function()
-- for c=1,#collected do
-- local cc = collected[c]
-- local dc = characters[cc]
-- if dc then
-- yield(cc,dc)
-- end
-- end
-- end)
-- else
-- return wrap(function() end)
-- end
-- end
-- function iterators.descriptions(data)
-- data = checkeddata(data)
-- local characters = data.characters
-- local descriptions = data.descriptions
-- if characters and descriptions then
-- local collected = sortedkeys(characters)
-- return wrap(function()
-- for c=1,#collected do
-- local cc = collected[c]
-- local dc = descriptions[cc]
-- if dc then
-- yield(cc,dc)
-- end
-- end
-- end)
-- else
-- return wrap(function() end)
-- end
-- end
-- function iterators.glyphs(data)
-- data = checkeddata(data)
-- local descriptions = data.descriptions
-- if descriptions then
-- local indices = getindices(data)
-- local collected = sortedkeys(indices)
-- return wrap(function()
-- for c=1,#collected do
-- local cc = collected[c]
-- local dc = descriptions[indices[cc]]
-- if dc then
-- yield(cc,dc)
-- end
-- end
-- end)
-- else
-- return wrap(function() end)
-- end
-- end
function iterators.characters(data)
data = checkeddata(data)
local characters = data.characters
if characters then
local collected = sortedkeys(characters)
local n, i = #collected, 0
return function()
i = i + 1
if i <= n then
local cc = collected[i]
local dc = characters[cc]
return cc, dc or { }
end
end
else
return dummy
end
end
function iterators.descriptions(data)
data = checkeddata(data)
local characters = data.characters
local descriptions = data.descriptions
if characters and descriptions then
local collected = sortedkeys(characters)
local n, i = #collected, 0
return function()
i = i + 1
if i <= n then
local cc = collected[i]
local dc = descriptions[cc]
return cc, dc or { }
end
end
else
return dummy
end
end
function iterators.glyphs(data)
data = checkeddata(data)
local descriptions = data.descriptions
if descriptions then
local indices = getindices(data)
local collected = sortedkeys(indices)
local n, i = #collected, 0
return function()
i = i + 1
if i <= n then
local cc = collected[i]
local dc = descriptions[indices[cc]]
return cc, dc or { }
end
end
else
return dummy
end
end
-- for the moment here, it might move to some other file later
function afm.getkern(tfmdata,left,right)
local c = tfmdata.characters[left]
if c then
local kerns = c.kerns
if kerns then
return kerns[right] -- already scaled
end
end
return 0
end
local getters = { -- maybe better getters[format][...]
kern = {
["type1"] = afm.getkern,
["type3"] = afm.getkern,
["opentype"] = otf.getkern,
},
substitution = {
["opentype"] = otf.getsubstitution,
},
alternate = {
["opentype"] = otf.getalternate,
},
multiple = {
["opentype"] = otf.getmultiple,
}
}
fonts.getters = getters
function fonts.getkern(tfmdata,left,right)
local format = tfmdata.properties.format
local getter = getters.kern[format]
if getter then
return getter(tfmdata,left,right)
else
return 0
end
end
function fonts.getsubstitution(tfmdata,k,kind)
local format = tfmdata.properties.format
local getter = getters.substitution[format]
if getter then
return getter(tfmdata,k,kind,value)
else
return 0
end
end
function fonts.getalternate(tfmdata,k,kind,value)
local format = tfmdata.properties.format
local getter = getters.substitution[format]
if getter then
return getter(tfmdata,k,kind,value)
else
return 0
end
end
function fonts.getmultiple(tfmdata,k,kind)
local format = tfmdata.properties.format
local getter = getters.substitution[format]
if getter then
return getter(tfmdata,k,kind,value)
else
return 0
end
end
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