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|
if not modules then modules = { } end modules ['good-mth'] = {
version = 1.000,
comment = "companion to font-lib.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local type, next, tonumber, unpack = type, next, tonumber, unpack
local ceil = math.ceil
local match = string.match
local fonts = fonts
local trace_goodies = false trackers.register("fonts.goodies", function(v) trace_goodies = v end)
local report_goodies = logs.reporter("fonts","goodies")
local registerotffeature = fonts.handlers.otf.features.register
local fontgoodies = fonts.goodies or { }
local fontcharacters = fonts.hashes.characters
local trace_defining = false trackers.register("math.defining", function(v) trace_defining = v end)
local report_math = logs.reporter("mathematics","initializing")
local nuts = nodes.nuts
local setlink = nuts.setlink
local nodepool = nuts.pool
local new_kern = nodepool.kern
local new_glyph = nodepool.glyph
local new_hlist = nodepool.hlist
local new_vlist = nodepool.vlist
local insertnodeafter = nuts.insertafter
local helpers = fonts.helpers
local upcommand = helpers.commands.up
local rightcommand = helpers.commands.right
local charcommand = helpers.commands.char
local prependcommands = helpers.prependcommands
-- experiment, we have to load the definitions immediately as they precede
-- the definition so they need to be initialized in the typescript
local function withscriptcode(tfmdata,unicode,data,action)
if type(unicode) == "string" then
local p, u = match(unicode,"^(.-):(.-)$")
if u then
u = tonumber(u)
if u then
local slots = fonts.helpers.mathscriptslots(tfmdata,u)
if slots then
if p == "*" then
action(u,data)
for i=1,#slots do
action(slots[i],data)
end
else
p = tonumber(p)
if p then
action(slots[p],data)
end
end
end
end
end
else
action(unicode,data)
end
end
local function finalize(tfmdata,feature,value)
-- if tfmdata.mathparameters then -- funny, cambria text has this
local goodies = tfmdata.goodies
if goodies then
local virtualized = mathematics.virtualized
for i=1,#goodies do
local goodie = goodies[i]
local mathematics = goodie.mathematics
local dimensions = mathematics and mathematics.dimensions
if dimensions then
if trace_defining then
report_math("overloading dimensions in %a @ %p",tfmdata.properties.fullname,tfmdata.parameters.size)
end
local characters = tfmdata.characters
local descriptions = tfmdata.descriptions
local parameters = tfmdata.parameters
local factor = parameters.factor
local hfactor = parameters.hfactor
local vfactor = parameters.vfactor
local function overloadone(unicode,data)
local character = characters[unicode]
if not character then
local c = virtualized[unicode]
if c then
character = characters[c]
end
end
if character then
local width = data.width
local height = data.height
local depth = data.depth
if trace_defining and (width or height or depth) then
report_math("overloading dimensions of %C, width %p, height %p, depth %p",
unicode,width or 0,height or 0,depth or 0)
end
if width then character.width = width * hfactor end
if height then character.height = height * vfactor end
if depth then character.depth = depth * vfactor end
--
local xoffset = data.xoffset
local yoffset = data.yoffset
if xoffset == "llx" then
local d = descriptions[unicode]
if d then
xoffset = - d.boundingbox[1] * hfactor
character.width = character.width + xoffset
xoffset = rightcommand[xoffset]
else
xoffset = nil
end
elseif xoffset and xoffset ~= 0 then
xoffset = rightcommand[xoffset * hfactor]
else
xoffset = nil
end
if yoffset and yoffset ~= 0 then
yoffset = upcommand[yoffset * vfactor]
else
yoffset = nil
end
if xoffset or yoffset then
local commands = character.commands
if commands then
prependcommands(commands,yoffset,xoffset)
else
local slot = charcommand[unicode]
if xoffset and yoffset then
character.commands = { xoffset, yoffset, slot }
elseif xoffset then
character.commands = { xoffset, slot }
else
character.commands = { yoffset, slot }
end
end
end
elseif trace_defining then
report_math("no overloading dimensions of %C, not in font",unicode)
end
end
local function overload(dimensions)
for unicode, data in next, dimensions do
withscriptcode(tfmdata,unicode,data,overloadone)
end
end
if value == nil then
value = { "default" }
end
if value == "all" or value == true then
for name, value in next, dimensions do
overload(value)
end
else
if type(value) == "string" then
value = utilities.parsers.settings_to_array(value)
end
if type(value) == "table" then
for i=1,#value do
local d = dimensions[value[i]]
if d then
overload(d)
end
end
end
end
end
end
end
end
registerotffeature {
name = "mathdimensions",
description = "manipulate math dimensions",
-- default = true,
manipulators = {
base = finalize,
node = finalize,
}
}
local function initialize(goodies)
local mathgoodies = goodies.mathematics
if mathgoodies then
local virtuals = mathgoodies.virtuals
local mapfiles = mathgoodies.mapfiles
local maplines = mathgoodies.maplines
if virtuals then
for name, specification in next, virtuals do
-- beware, they are all constructed ... we should be more selective
mathematics.makefont(name,specification,goodies)
end
end
if mapfiles then
for i=1,#mapfiles do
fonts.mappings.loadfile(mapfiles[i]) -- todo: backend function
end
end
if maplines then
for i=1,#maplines do
fonts.mappings.loadline(maplines[i]) -- todo: backend function
end
end
end
end
fontgoodies.register("mathematics", initialize)
-- local enabled = false directives.register("fontgoodies.mathkerning",function(v) enabled = v end)
local function initialize(tfmdata)
-- if enabled and tfmdata.mathparameters then -- funny, cambria text has this
if tfmdata.mathparameters then -- funny, cambria text has this
local goodies = tfmdata.goodies
if goodies then
local characters = tfmdata.characters
if characters[0x1D44E] then -- 119886
-- we have at least an italic a
for i=1,#goodies do
local mathgoodies = goodies[i].mathematics
if mathgoodies then
local kerns = mathgoodies.kerns
if kerns then
local function kernone(unicode,data)
local chardata = characters[unicode]
if chardata and (not chardata.mathkerns or data.force) then
chardata.mathkerns = data
end
end
for unicode, data in next, kerns do
withscriptcode(tfmdata,unicode,data,kernone)
end
return
end
end
end
else
return -- no proper math font anyway
end
end
end
end
registerotffeature {
name = "mathkerns",
description = "math kerns",
-- default = true,
initializers = {
base = initialize,
node = initialize,
}
}
-- math italics (not really needed)
--
-- it would be nice to have a \noitalics\font option
local function initialize(tfmdata)
local goodies = tfmdata.goodies
if goodies then
local shared = tfmdata.shared
for i=1,#goodies do
local mathgoodies = goodies[i].mathematics
if mathgoodies then
local mathitalics = mathgoodies.italics
if mathitalics then
local properties = tfmdata.properties
if properties.setitalics then
mathitalics = mathitalics[file.nameonly(properties.name)] or mathitalics
if mathitalics then
if trace_goodies then
report_goodies("loading mathitalics for font %a",properties.name)
end
local corrections = mathitalics.corrections
local defaultfactor = mathitalics.defaultfactor
-- properties.mathitalic_defaultfactor = defaultfactor -- we inherit outer one anyway (name will change)
if corrections then
fontgoodies.registerpostprocessor(tfmdata, function(tfmdata) -- this is another tfmdata (a copy)
-- better make a helper so that we have less code being defined
local properties = tfmdata.properties
local parameters = tfmdata.parameters
local characters = tfmdata.characters
properties.mathitalic_defaultfactor = defaultfactor
properties.mathitalic_defaultvalue = defaultfactor * parameters.quad
if trace_goodies then
report_goodies("assigning mathitalics for font %a",properties.name)
end
local quad = parameters.quad
local hfactor = parameters.hfactor
for k, v in next, corrections do
local c = characters[k]
if c then
if v > -1 and v < 1 then
c.italic = v * quad
else
c.italic = v * hfactor
end
else
report_goodies("invalid mathitalics entry %U for font %a",k,properties.name)
end
end
end)
end
return -- maybe not as these can accumulate
end
end
end
end
end
end
end
registerotffeature {
name = "mathitalics",
description = "additional math italic corrections",
-- default = true,
initializers = {
base = initialize,
node = initialize,
}
}
-- fontgoodies.register("mathitalics", initialize)
local function mathradicalaction(n,h,v,font,mchar,echar)
local characters = fontcharacters[font]
local mchardata = characters[mchar]
local echardata = characters[echar]
local ewidth = echardata.width
local mwidth = mchardata.width
local delta = h - ewidth
local glyph = new_glyph(font,echar)
local head = glyph
if delta > 0 then
local count = ceil(delta/mwidth)
local kern = (delta - count * mwidth) / count
for i=1,count do
local k = new_kern(kern)
local g = new_glyph(font,mchar)
setlink(k,head)
setlink(g,k)
head = g
end
end
local height = mchardata.height
local list = new_hlist(head)
local kern = new_kern(height-v)
list = setlink(kern,list)
local list = new_vlist(kern)
insertnodeafter(n,n,list)
end
local function mathhruleaction(n,h,v,font,bchar,mchar,echar)
local characters = fontcharacters[font]
local bchardata = characters[bchar]
local mchardata = characters[mchar]
local echardata = characters[echar]
local bwidth = bchardata.width
local mwidth = mchardata.width
local ewidth = echardata.width
local delta = h - ewidth - bwidth
local glyph = new_glyph(font,echar)
local head = glyph
if delta > 0 then
local count = ceil(delta/mwidth)
local kern = (delta - count * mwidth) / (count+1)
for i=1,count do
local k = new_kern(kern)
local g = new_glyph(font,mchar)
setlink(k,head)
setlink(g,k)
head = g
end
local k = new_kern(kern)
setlink(k,head)
head = k
end
local g = new_glyph(font,bchar)
setlink(g,head)
head = g
local height = mchardata.height
local list = new_hlist(head)
local kern = new_kern(height-v)
list = setlink(kern,list)
local list = new_vlist(kern)
insertnodeafter(n,n,list)
end
local function initialize(tfmdata)
local goodies = tfmdata.goodies
if goodies then
local resources = tfmdata.resources
local ruledata = { }
for i=1,#goodies do
local mathematics = goodies[i].mathematics
if mathematics then
local rules = mathematics.rules
if rules then
for tag, name in next, rules do
ruledata[tag] = name
end
end
end
end
if next(ruledata) then
local characters = tfmdata.characters
local unicodes = resources.unicodes
if characters and unicodes then
local mathruleactions = resources.mathruleactions
if not mathruleactions then
mathruleactions = { }
resources.mathruleactions = mathruleactions
end
--
local mchar = unicodes[ruledata["radical.extender"] or false]
local echar = unicodes[ruledata["radical.end"] or false]
if mchar and echar then
mathruleactions.radicalaction = function(n,h,v,font)
mathradicalaction(n,h,v,font,mchar,echar)
end
end
--
local bchar = unicodes[ruledata["hrule.begin"] or false]
local mchar = unicodes[ruledata["hrule.extender"] or false]
local echar = unicodes[ruledata["hrule.end"] or false]
if bchar and mchar and echar then
mathruleactions.hruleaction = function(n,h,v,font)
mathhruleaction(n,h,v,font,bchar,mchar,echar)
end
end
-- not that nice but we need to register it at the tex end
-- context.enablemathrules("\\fontclass")
end
end
end
end
registerotffeature {
name = "mathrules",
description = "check math rules",
default = true,
initializers = {
base = initialize,
node = initialize,
}
}
|