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if not modules then modules = { } end modules ['font-imp-math'] = {
version = 1.001,
comment = "companion to font-ini.mkiv and hand-ini.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local next, type, tonumber = next, type, tonumber
local fonts = fonts
local helpers = fonts.helpers
local registerotffeature = fonts.handlers.otf.features.register
local setmetatableindex = table.setmetatableindex
local texconditionals = tex.conditionals
-- tfmdata.properties.mathnolimitsmode = tonumber(value) or 0
local splitter = lpeg.splitat(",",tonumber)
local lpegmatch = lpeg.match
local function initialize(tfmdata,value)
local mathparameters = tfmdata.mathparameters
if mathparameters then
local sup, sub
if type(value) == "string" then
sup, sub = lpegmatch(splitter,value)
if not sup then
sub, sup = 0, 0
elseif not sub then
sub, sup = sup, 0
end
elseif type(value) == "number" then
sup, sub = 0, value
end
if sup then
mathparameters.NoLimitSupFactor = sup
end
if sub then
mathparameters.NoLimitSubFactor = sub
end
end
end
registerotffeature {
name = "mathnolimitsmode",
description = "influence nolimits placement",
initializers = {
base = initialize,
node = initialize,
}
}
-- this will become a mode in the engine
local function initialize(tfmdata,value)
tfmdata.properties.nostackmath = value and true
end
registerotffeature {
name = "nostackmath",
description = "disable math stacking mechanism",
initializers = {
base = initialize,
node = initialize,
}
}
-- A quick and dirty and low level implementation but okay for testing:
function fonts.helpers.mathscriptslots(tfmdata,textcode)
local rawdata = tfmdata.shared.rawdata
local rawresources = rawdata and rawdata.resources
local rawfeatures = rawresources and rawresources.features
local basesubstitutions = rawfeatures and rawfeatures.gsub
local sequences = basesubstitutions and tfmdata.resources.sequences
if sequences then
local characters = tfmdata.characters
if characters[textcode] then
for s=1,#sequences do
local sequence = sequences[s]
local sfeatures = sequence.features
if sfeatures and sfeatures.ssty then
local steps = sequence.steps
for i=1,#steps do
local coverage = steps[i].coverage
if coverage then
local okay = coverage[textcode]
if okay then
return okay
end
end
end
end
end
end
end
end
local function manipulate(tfmdata,value)
if texconditionals["c_font_compact"] then
local rawdata = tfmdata.shared.rawdata
local rawresources = rawdata and rawdata.resources
local rawfeatures = rawresources and rawresources.features
local basesubstitutions = rawfeatures and rawfeatures.gsub
local sequences = basesubstitutions and tfmdata.resources.sequences
if sequences then
local characters = tfmdata.characters
for s=1,#sequences do
local sequence = sequences[s]
local sfeatures = sequence.features
if sfeatures and sfeatures.ssty then
local steps = sequence.steps
for i=1,#steps do
local coverage = steps[i].coverage
if coverage then
for textcode, v in next, coverage do
local textdata = characters[textcode]
if textdata then
local scriptcode = v[1]
local scriptscriptcode = v[2]
local scriptdata = characters[scriptcode]
local scriptscriptdata = characters[scriptscriptcode]
if scriptdata then
textdata.smaller = scriptcode
end
if scriptscriptdata then
scriptdata.smaller = scriptscriptcode
end
end
end
end
end
end
end
end
end
end
local function initialize(tfmdata,value)
if texconditionals["c_font_compact"] then
local rawdata = tfmdata.shared.rawdata
local rawresources = rawdata and rawdata.resources
local mathconstants = rawresources.mathconstants
if mathconstants then
local parameters = tfmdata.parameters
parameters.textscale = 1000
parameters.scriptscale = mathconstants.ScriptPercentScaleDown * 10
parameters.scriptscriptscale = mathconstants.ScriptScriptPercentScaleDown * 10
end
end
end
local specification = {
name = "compactmath",
description = "use one math font",
manipulators = {
base = manipulate,
node = manipulate,
},
initializers = {
base = initialize,
node = initialize,
}
}
registerotffeature(specification)
-- The problem is that the traditional code path doesn't add an italic to the subscript,
-- simply because it assumes that the width has that already subtracted. So, we cannot
-- compensate in the following way. We're stuck with the fact that the texgyre fonts
-- assume a traditional tex engine.
-- local function manipulate(tfmdata,key,value)
-- if value == "correct" then
-- local chardata = characters.data
-- for unicode, data in next, tfmdata.characters do
-- local italic = data.italic
-- if italic then
-- -- todo: only letters
-- data.width = (data.width or 0) + italic
-- local cd = chardata[unicode]
-- if cd then
-- local visual = cd.visual
-- if visual == "it" or visual == "bi" then
-- italic = -italic
-- else
-- italic = 0
-- end
-- else
-- italic = 0
-- end
-- data.italic = italic
-- end
-- end
-- end
-- end
local function initialize(tfmdata,value)
if value then
local rawdata = tfmdata.shared.rawdata
local rawresources = rawdata and rawdata.resources
local mathconstants = rawresources.mathconstants
if mathconstants then
tfmdata.properties.oldmath = true
end
end
end
local specification = {
name = "oldmath",
description = "deal with fake opentype fonts",
-- manipulators = {
-- base = manipulate,
-- node = manipulate,
-- },
initializers = {
base = initialize,
node = initialize,
}
}
registerotffeature(specification)
local function initialize(tfmdata,value)
if type(value) == "string" then
local rawdata = tfmdata.shared.rawdata
local rawresources = rawdata and rawdata.resources
local mathconstants = rawresources.mathconstants
if mathconstants then
local bitmap = tex.stringtocodesbitmap(value,tex.mathcontrolcodes)
-- logs.report("mathfont","setting math control to %08X",bitmap)
tfmdata.properties.mathcontrol = bitmap
end
end
end
local specification = {
name = "mathcontrol",
description = "control specific old/new math handling",
initializers = {
base = initialize,
node = initialize,
}
}
registerotffeature(specification)
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