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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"
}
if not context then return end
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
-- requested for latex but not supported unless really needed in context:
--
-- registerotffeature {
-- name = "ignoremathconstants",
-- description = "ignore math constants table",
-- initializers = {
-- base = function(tfmdata,value)
-- if value then
-- tfmdata.mathparameters = nil
-- end
-- end
-- }
-- }
-- 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,
}
}
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,
}
}
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 initialize(tfmdata,key,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",
initializers = {
base = initialize,
node = initialize,
}
}
registerotffeature(specification)
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