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if not modules then modules = { } end modules ['x-cals'] = {
version = 1.001,
comment = "companion to x-cals.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local next = next
local format, lower = string.format, string.lower
local xmlcprint, xmlcollected, xmlelements = xml.cprint, xml.collected, xml.elements
local n_todimen, s_todimen = number.todimen, string.todimen
-- there is room for speedups as well as cleanup (using context functions)
local cals = { }
moduledata.cals = cals
lxml.mathml = cals -- for the moment
cals.ignore_widths = false
cals.shrink_widths = false
cals.stretch_widths = false
-- the following flags only apply to columns that have a specified width
--
-- proportional : shrink or stretch proportionally to the width
-- equal : shrink or stretch equaly distributed
-- n < 1 : shrink or stretch proportionally to the width but multiplied by n
--
-- more clever things, e.g. the same but applied to unspecified widths
-- has to happen at the core-ntb level (todo)
local halignments = {
left = "flushleft",
right = "flushright",
center = "middle",
centre = "middle",
justify = "normal",
}
local valignments = {
top = "high",
bottom = "low",
middle = "lohi",
}
local function adapt(widths,b,w,delta,sum,n,what)
if b == "equal" then
delta = delta/n
for k, v in next, w do
widths[k] = n_todimen(v - delta)
end
elseif b == "proportional" then
delta = delta/sum
for k, v in next, w do
widths[k] = n_todimen(v - v*delta)
end
elseif type(b) == "number" and b < 1 then
delta = b*delta/sum
for k, v in next, w do
widths[k] = n_todimen(v - v*delta)
end
end
end
local function getspecs(root, pattern, names, widths)
-- here, but actually we need this in core-ntb.tex
-- but ideally we need an mkiv enhanced core-ntb.tex
local ignore_widths = cals.ignore_widths
-- local shrink_widths = at.option == "shrink" or cals.shrink_widths
-- local stretch_widths = at.option == "stretch" or cals.stretch_widths
local shrink_widths = cals.shrink_widths
local stretch_widths = cals.stretch_widths
for e in xmlcollected(root,pattern) do
local at = e.at
local column = at.colnum
if column then
if not ignore_widths then
local width = at.colwidth
if width then
widths[tonumber(column)] = lower(width)
end
end
local name = at.colname
if name then
names[name] = tonumber(column)
end
end
end
if ignore_width then
-- forget about it
elseif shrink_widths or stretch_widths then
local sum, n, w = 0, 0, { }
for _, v in next, widths do
n = n + 1
v = (type(v) == "string" and s_todimen(v)) or v
if v then
w[n] = v
sum = sum + v
end
end
local hsize = tex.hsize
if type(hsize) == "string" then
hsize = s_todimen(hsize)
end
local delta = sum - hsize
if shrink_widths and delta > 0 then
adapt(widths,shrink_widths,w,delta,sum,n,"shrink")
elseif stretch_widths and delta < 0 then
adapt(widths,stretch_widths,w,delta,sum,n,"stretch")
end
end
end
local function getspans(root, pattern, names, spans)
for e in xmlcollected(root,pattern) do
local at = e.at
local name, namest, nameend = at.colname, names[at.namest or "?"], names[at.nameend or "?"]
if name and namest and nameend then
spans[name] = tonumber(nameend) - tonumber(namest) + 1
end
end
end
local bTR, eTR, bTD, eTD = context.bTR, context.eTR, context.bTD, context.eTD
function cals.table(root,namespace)
local prefix = (namespace or "cals") .. ":"
local prefix = namespace and namespace ~= "" and (namespace .. ":") or ""
local p = "/" .. prefix
local tgroupspec = p .. "tgroup"
local colspec = p .. "colspec"
local spanspec = p .. "spanspec"
local hcolspec = p .. "thead" .. p .. "colspec"
local bcolspec = p .. "tbody" .. p .. "colspec"
local fcolspec = p .. "tfoot" .. p .. "colspec"
local entryspec = p .. "entry" .. "|" .. prefix .. "entrytbl" -- shouldn't that be p ?
local hrowspec = p .. "thead" .. p .. "row"
local browspec = p .. "tbody" .. p .. "row"
local frowspec = p .. "tfoot" .. p .. "row"
local function tablepart(root, xcolspec, xrowspec, before, after) -- move this one outside
before()
local at = root.at
local pphalign, ppvalign = at.align, at.valign
local names, widths, spans = { }, { }, { }
getspecs(root, colspec , names, widths)
getspecs(root, xcolspec, names, widths)
getspans(root, spanspec, names, spans)
for r, d, k in xmlelements(root,xrowspec) do
bTR()
local dk = d[k]
local at = dk.at
local phalign, pvalign = at.align or pphalign, at.valign or ppvalign -- todo: __p__ test
local col = 1
for rr, dd, kk in xmlelements(dk,entryspec) do
local dk = dd[kk]
if dk.tg == "entrytbl" then
-- bTD(function() cals.table(dk) end)
bTD()
context("{")
cals.table(dk)
context("}")
eTD()
col = col + 1
else
local at = dk.at
local b, e, s, m = names[at.namest or "?"], names[at.nameend or "?"], spans[at.spanname or "?"], at.morerows
local halign, valign = at.align or phalign, at.valign or pvalign
if b and e then
s = e - b + 1
end
if halign then
halign = halignments[halign]
end
if valign then
valign = valignments[valign]
end
local width = widths[col]
if s or m or halign or valign or width then -- currently only english interface !
bTD {
nx = s or 1,
ny = (m or 0) + 1,
align = format("{%s,%s}",halign or "flushleft",valign or "high"),
width = width or "fit",
}
else
bTD {
align = "{flushleft,high}",
width = "fit", -- else problems with vertical material
}
end
xmlcprint(dk)
eTD()
col = col + (s or 1)
end
end
eTR()
end
after()
end
for tgroup in lxml.collected(root,tgroupspec) do
context.directsetup("cals:table:before")
lxml.directives.before(root,"cdx") -- "cals:table"
context.bgroup()
lxml.directives.setup(root,"cdx") -- "cals:table"
context.bTABLE()
tablepart(tgroup, hcolspec, hrowspec, context.bTABLEhead, context.eTABLEhead)
tablepart(tgroup, bcolspec, browspec, context.bTABLEbody, context.eTABLEbody)
tablepart(tgroup, fcolspec, frowspec, context.bTABLEfoot, context.eTABLEfoot)
context.eTABLE()
context.egroup()
lxml.directives.after(root,"cdx") -- "cals:table"
context.directsetup("cals:table:after")
end
end
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