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if not modules then modules = { } end modules ['math-spa'] = {
version = 1.001,
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"
}
-- for the moment (when testing) we use a penalty 1
local penalty_code = nodes.nodecodes.penalty
local glue_code = nodes.nodecodes.glue
local nuts = nodes.nuts
local tonut = nodes.tonut
local tonode = nodes.tonode
local getid = nuts.getid
local getnext = nuts.getnext
local getwidth = nuts.getwidth
local setglue = nuts.setglue
local getpenalty = nuts.getpenalty
local setpenalty = nuts.setpenalty
local get_dimensions = nuts.dimensions
local nextglue = nuts.traversers.glue
local texsetdimen = tex.setdimen
local v_none = interfaces.variables.none
local v_auto = interfaces.variables.auto
local method = v_none
local distance = 0
function noads.handlers.align(h)
if method ~= v_none then
if method == v_auto then
local s = h
while s do
local id = getid(s)
local n = getnext(s)
if id == penalty_code and getpenalty(s) == 1 then
setpenalty(s,0)
if n and getid(n) == glue_code then
s = n
n = getnext(s)
end
local w = get_dimensions(h,n) + distance
texsetdimen("global","d_strc_math_indent",w)
break
end
s = n
end
else
texsetdimen("global","d_strc_math_indent",distance)
end
for n in nextglue, h do
setglue(n,getwidth(n),0,0)
end
else
-- texsetdimen("global","d_strc_math_indent",0)
end
end
interfaces.implement {
name = "setmathhang",
arguments = {
{
{ "method", "string" },
{ "distance", "dimension" },
}
},
actions = function(t)
method = t.method or v_none
distance = t.distance or 0
end
}
interfaces.implement {
name = "resetmathhang",
actions = function(t)
method = v_none
distance = 0
end
}
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