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if not modules then modules = { } end modules ['math-pre'] = {
version = 1.001,
optimize = true,
comment = "companion to math-ini.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local type, tonumber = type, tonumber
local gmatch, find, topattern = string.gmatch, string.find, string.topattern
local parameterlist = tex.getmathparametervalues()
local mathstylelist = tex.getmathstylenamevalues()
local parameterhash = table.swapped(parameterlist)
local mathstylehash = table.swapped(mathstylelist)
local axis = parameterhash.axis
local getmath = tex.getmath
local setmath = tex.setmath
local function expandparameters(t)
local result = { }
local kind = type(t)
local function expand(s)
s = topattern(s)
for i=1,#parameterlist do
local p = parameterlist[i]
if find(p,s) then
result[#result+1] = p
end
end
end
if kind == "string" then
for s in gmatch(t,"[^%s,]+") do
expand(s)
end
elseif kind == "table" then
for i=1,#t do
expand(t[i])
end
end
return result
end
function setmathparameters(t)
if t then
for i=1,#t do
local ti = t[i]
local list = ti.list
local factor = ti.factor or 1
local style = ti.style
local value = ti.value
local unit = ti.unit
local function set(li,si,value)
if value then
setmath(li,si,value)
elseif factor == 0 then
setmath(li,si,0)
elseif unit == "axis" then
setmath(li,si,factor * getmath(axis,i))
else
setmath(li,si,factor * getmath(li,i))
end
end
for i=1,#list do
local li = parameterhash[list[i]]
if li then
if style == "all" then
for si=0,7 do
set(li,si,value)
end
elseif type(style) == "string" then
local si = mathstylehash[style]
if si then
set(li,si,value)
end
else
for s=1,#style do
local si = mathstylehash[style[s]]
if si then
set(li,si,value)
end
end
end
end
end
end
end
end
-- example
local stacklist = {
"fractionnumvgap",
"fractiondenomvgap",
"fractionnumup",
"fractiondenomdown",
"stackdenomdown",
"stacknumup",
"stackvgap",
}
local presets = {
less = {
{
factor = .5,
-- factor = 0,
-- value = 655360,
-- unit = "axis",
list = stacklist,
-- style = { "display" },
-- style = "display",
style = "all"
},
},
more = {
{
factor = 2,
list = stacklist,
style = "all"
},
},
zero = {
{
factor = 0,
list = stacklist,
style = "all"
},
},
}
mathematics.presets = presets -- we might need to store these in the format file
function mathematics.preset(list)
for s in gmatch(list,"[^%s,]+") do
setmathparameters(presets[s])
end
end
-- todo: append, prepend, inherit
interfaces.implement {
name = "definemathpreset",
public = true,
protected = true,
arguments = { "optional", "hash" },
actions = function(name,t)
if next(t) then
local factor = t.factor
local style = t.style
local list = t.list
local unit = t.unit
if factor then
t.factor = tonumber(factor)
end
if style and style ~= "all" then
t.style = utilities.parsers.settings_to_array(style)
end
if list then
-- t.list = utilities.parsers.settings_to_array(list)
t.list = expandparameters(list)
end
if unit and unit ~= "axis" then
t.unit = nil
end
-- todo: value
local p = presets[name]
if p then
p[#p+1] = t
else
presets[name] = t
end
else
presets[name] = nil
end
end,
}
interfaces.implement {
name = "presetmathematics",
public = true,
protected = true,
arguments = "optional",
actions = mathematics.preset,
}
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