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|
if not modules then modules = { } end modules ['tabl-xtb'] = {
version = 1.001,
comment = "companion to tabl-xtb.mkvi",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
--[[
This table mechanism is a combination between TeX and Lua. We do process
cells at the TeX end and inspect them at the Lua end. After some analysis
we have a second pass using the calculated widths, and if needed cells
will go through a third pass to get the heights right. This last pass is
avoided when possible which is why some code below looks a bit more
complex than needed. The reason for such optimizations is that each cells
is actually a framed instance and because tables like this can be hundreds
of pages we want to keep processing time reasonable.
To a large extend the behaviour is comparable with the way bTABLE/eTABLE
works and there is a module that maps that one onto this one. Eventually
this mechamism will be improved so that it can replace its older cousin.
]]--
local texdimen = tex.dimen
local texcount = tex.count
local texbox = tex.box
local texsetcount = tex.setcount
local texsetdimen = tex.setdimen
local format = string.format
local context = context
local context_beginvbox = context.beginvbox
local context_endvbox = context.endvbox
local context_blank = context.blank
local context_nointerlineskip = context.nointerlineskip
local variables = interfaces.variables
local setmetatableindex = table.setmetatableindex
local copy_node_list = node.copy_list
local hpack_node_list = node.hpack
local vpack_node_list = node.vpack
local slide_node_list = node.slide
local flush_node_list = node.flush_list
local new_glue = nodes.pool.glue
local new_kern = nodes.pool.kern
local v_stretch = variables.stretch
local v_normal = variables.normal
local v_width = variables.width
local v_repeat = variables["repeat"]
xtables = { }
local head_mode = 1
local foot_mode = 2
local more_mode = 3
local body_mode = 4
local stack, data = { }, nil
function xtables.create(settings)
table.insert(stack,data)
local rows = { }
local widths = { }
local heights = { }
local depths = { }
local spans = { }
local distances = { }
local autowidths = { }
local modes = { }
local fixedrows = { }
local fixedcolumns = { }
data = {
rows = rows,
widths = widths,
heights = heights,
depths = depths,
spans = spans,
distances = distances,
modes = modes,
autowidths = autowidths,
fixedrows = fixedrows,
fixedcolumns = fixedcolumns,
nofrows = 0,
nofcolumns = 0,
currentrow = 0,
currentcolumn = 0,
settings = settings or { },
}
local function add_zero(t,k)
t[k] = 0
return 0
end
local function add_cell(row,c)
local cell = {
nx = 0,
ny = 0,
list = false,
}
row[c] = cell
if c > data.nofcolumns then
data.nofcolumns = c
end
return cell
end
local function add_row(rows,r)
local row = { }
setmetatableindex(row,add_cell)
rows[r] = row
if r > data.nofrows then
data.nofrows = r
end
return row
end
setmetatableindex(rows,add_row)
setmetatableindex(widths,add_zero)
setmetatableindex(heights,add_zero)
setmetatableindex(depths,add_zero)
setmetatableindex(distances,add_zero)
setmetatableindex(modes,add_zero)
--
settings.columndistance = tonumber(settings.columndistance) or 0
settings.rowdistance = tonumber(settings.rowdistance) or 0
settings.leftmargindistance = tonumber(settings.leftmargindistance) or 0
settings.rightmargindistance = tonumber(settings.rightmargindistance) or 0
settings.options = utilities.parsers.settings_to_hash(settings.option)
settings.textwidth = tonumber(settings.textwidth) or tex.hsize
settings.maxwidth = tonumber(settings.maxwidth) or settings.textwidth/8
-- if #stack > 0 then
-- settings.textwidth = tex.hsize
-- end
end
function xtables.initialize_reflow_width()
local r = data.currentrow
local c = data.currentcolumn + 1
local drc = data.rows[r][c]
drc.nx = texcount.x_table_nx
drc.ny = texcount.x_table_ny
local distances = data.distances
local distance = texdimen.x_table_distance
if distance > distances[c] then
distances[c] = distance
end
data.currentcolumn = c
end
function xtables.initialize_reflow_height()
local r = data.currentrow
local c = data.currentcolumn + 1
local rows = data.rows
local row = rows[r]
while row[c].span do -- can also be previous row ones
c = c + 1
end
data.currentcolumn = c
local widths = data.widths
local w = widths[c]
local drc = row[c]
for x=1,drc.nx-1 do
w = w + widths[c+x]
end
texdimen.x_table_width = w
local dimensionstate = drc.dimensionstate or 0
if dimensionstate == 1 or dimensionstate == 3 then
-- width was fixed so height is known
texcount.x_table_skip_mode = 1
elseif dimensionstate == 2 then
-- height is enforced
texcount.x_table_skip_mode = 1
elseif data.autowidths[c] then
-- width has changed so we need to recalculate the height
texcount.x_table_skip_mode = 0
else
texcount.x_table_skip_mode = 1
end
end
function xtables.set_reflow_width()
local r = data.currentrow
local c = data.currentcolumn
local rows = data.rows
local row = rows[r]
while row[c].span do -- can also be previous row ones
c = c + 1
end
local tb = texbox.x_table_box
local drc = row[c]
--
drc.list = true -- we don't need to keep the content around as we're in trial mode (no: copy_node_list(tb))
--
local widths, width = data.widths, tb.width
if width > widths[c] then
widths[c] = width
end
local heights, height = data.heights, tb.height
if height > heights[r] then
heights[r] = height
end
local depths, depth = data.depths, tb.depth
if depth > depths[r] then
depths[r] = depth
end
--
local dimensionstate = texcount.frameddimensionstate
if dimensionstate == 1 then
data.fixedcolumns[c] = width
elseif dimensionstate == 2 then
data.fixedrows[r] = height
elseif dimensionstate == 3 then
data.fixedrows[r] = width
data.fixedcolumns[c] = height
end
drc.dimensionstate = dimensionstate
--
local nx, ny = drc.nx, drc.ny
if nx > 1 or ny > 1 then
local spans = data.spans
local self = true
for y=1,ny do
for x=1,nx do
if self then
self = false
else
local ry = r + y - 1
local cx = c + x - 1
if y > 1 then
spans[ry] = true
end
rows[ry][cx].span = true
end
end
end
c = c + nx - 1
end
if c > data.nofcolumns then
data.nofcolumns = c
end
data.currentcolumn = c
end
function xtables.set_reflow_height()
local r = data.currentrow
local c = data.currentcolumn
local rows = data.rows
local row = rows[r]
while row[c].span do -- we could adapt drc.nx instead
c = c + 1
end
local tb = texbox.x_table_box
local drc = row[c]
if not data.fixedrows[r] then -- and drc.dimensionstate < 2
local heights, height = data.heights, tb.height
if height > heights[r] then
heights[r] = height
end
local depths, depth = data.depths, tb.depth
if depth > depths[r] then
depths[r] = depth
end
end
c = c + drc.nx - 1
data.currentcolumn = c
end
function xtables.initialize_construct()
local r = data.currentrow
local c = data.currentcolumn + 1
local rows = data.rows
local row = rows[r]
while row[c].span do -- can also be previous row ones
c = c + 1
end
data.currentcolumn = c
local widths = data.widths
local heights = data.heights
local depths = data.depths
local w = widths[c]
local h = heights[r]
local d = depths[r]
local drc = row[c]
for x=1,drc.nx-1 do
w = w + widths[c+x]
end
for y=1,drc.ny-1 do
h = h + heights[r+y]
d = d + depths[r+y]
end
texdimen.x_table_width = w
texdimen.x_table_height = h + d
texdimen.x_table_depth = 0
end
function xtables.set_construct()
local r = data.currentrow
local c = data.currentcolumn
local rows = data.rows
local row = rows[r]
while row[c].span do -- can also be previous row ones
c = c + 1
end
local drc = row[c]
-- this will change as soon as in luatex we can reset a box list without freeing
drc.list = copy_node_list(texbox.x_table_box)
c = c + drc.nx - 1
data.currentcolumn = c
end
function xtables.reflow_width()
local nofrows = data.nofrows
local nofcolumns = data.nofcolumns
local rows = data.rows
for r=1,nofrows do
local row = rows[r]
for c=1,nofcolumns do
local drc = row[c]
if drc.list then
--- flush_node_list(drc.list)
drc.list = false
end
end
end
-- spread
local settings = data.settings
local options = settings.options
local maxwidth = settings.maxwidth
-- calculate width
local widths = data.widths
local distances = data.distances
local autowidths = data.autowidths
local fixedcolumns = data.fixedcolumns
local width = 0
local distance = 0
local nofwide = 0
local widetotal = 0
if options[variables.max] then
for c=1,nofcolumns do
width = width + widths[c]
if width > maxwidth then
autowidths[c] = true
nofwide = nofwide + 1
widetotal = widetotal + widths[c]
end
if c < nofcolumns then
distance = distance + distances[c]
end
end
else
for c=1,nofcolumns do -- also keep track of forced
local fixedwidth = fixedcolumns[c]
if fixedwidth then
widths[c] = fixedwidth
width = width + fixedwidth
else
width = width + widths[c]
if width > maxwidth then
autowidths[c] = true
nofwide = nofwide + 1
widetotal = widetotal + widths[c]
end
end
if c < nofcolumns then
distance = distance + distances[c]
end
end
end
local delta = settings.textwidth - width - distance - (nofcolumns-1) * settings.columndistance
- settings.leftmargindistance - settings.rightmargindistance
--
if delta == 0 then
-- nothing to be done
elseif delta > 0 then
-- we can distribute some
if not options[v_stretch] then
-- not needed
elseif options[v_width] then
for c=1,nofcolumns do
widths[c] = widths[c] + delta * widths[c] / width
end
else
local plus = delta / nofcolumns
for c=1,nofcolumns do
widths[c] = widths[c] + plus
end
end
elseif nofwide > 0 then
if options[v_width] then
-- proportionally
for c=1,nofcolumns do
local minus = - delta / nofwide
if autowidths[c] then
widths[c] = widths[c] - minus
end
end
else
-- we can also consider a loop adding small amounts till
-- we have a fit etc which is sometimes nicer
local available = (widetotal + delta) / nofwide
for c=1,nofcolumns do
if autowidths[c] and available >= widths[c] then
autowidths[c] = nil
nofwide = nofwide - 1
widetotal = widetotal - widths[c]
end
end
local available = (widetotal + delta) / nofwide
for c=1,nofcolumns do
if autowidths[c] then
widths[c] = available
end
end
-- maybe stretch
end
end
--
data.currentrow = 0
data.currentcolumn = 0
end
function xtables.reflow_height()
data.currentrow = 0
data.currentcolumn = 0
end
function xtables.construct()
local rows = data.rows
local heights = data.heights
local depths = data.depths
local widths = data.widths
local spans = data.spans
local distances = data.distances
local modes = data.modes
local settings = data.settings
local nofcolumns = data.nofcolumns
local nofrows = data.nofrows
local columndistance = settings.columndistance
local rowdistance = settings.rowdistance
local leftmargindistance = settings.leftmargindistance
local rightmargindistance = settings.rightmargindistance
-- ranges can be mixes so we collect
local ranges = {
[head_mode] = { },
[foot_mode] = { },
[more_mode] = { },
[body_mode] = { },
}
for r=1,nofrows do
local m = modes[r]
if m == 0 then
m = body_mode
end
local range = ranges[m]
range[#range+1] = r
end
-- todo: hook in the splitter ... the splitter can ask for a chunk of
-- a certain size ... no longer a split memory issue then and header
-- footer then has to happen here too .. target height
local function packaged_column(r)
local row = rows[r]
local start = nil
local stop = nil
if leftmargindistance > 0 then
start = new_kern(leftmargindistance)
stop = start
end
for c=1,nofcolumns do
local drc = row[c]
local list = drc.list
if list then
list.shift = list.height + list.depth
list = hpack_node_list(list) -- is somehow needed
list.width = 0
list.height = 0
list.depth = 0
if start then
stop.next = list
list.prev = stop
else
start = list
end
stop = list -- one node anyway, so not needed: slide_node_list(list)
end
local step = widths[c]
if c < nofcolumns then
step = step + columndistance + distances[c]
end
if stop then
local kern = new_kern(step)
stop.prev = kern
stop.next = kern
stop = kern
end
end
if start then
if rightmargindistance > 0 then
local kern = new_kern(rightmargindistance)
stop.next = kern
kern.prev = stop
-- stop = kern
end
return start, heights[r] + depths[r]
end
end
local function collect_range(range)
local result = { }
local nofrange = #range
for i=1,#range do
local r = range[i]
local row = rows[r]
local list, size = packaged_column(r)
if list then
result[#result+1] = {
hpack_node_list(list),
size,
i < nofrange and rowdistance > 0 and rowdistance or false, -- might move
}
end
end
return result
end
local body = collect_range(ranges[body_mode])
data.results = {
[head_mode] = collect_range(ranges[head_mode]),
[foot_mode] = collect_range(ranges[foot_mode]),
[more_mode] = collect_range(ranges[more_mode]),
[body_mode] = body,
}
if #body == 0 then
texsetcount("global","x_table_state",0)
texsetdimen("global","x_table_final_width",0)
else
texsetcount("global","x_table_state",1)
texsetdimen("global","x_table_final_width",body[1][1].width)
end
end
local function inject(row,copy,package)
local list = row[1]
if copy then
row[1] = copy_node_list(list)
end
if package then
context_beginvbox()
context(list)
context(new_kern(row[2]))
context_endvbox()
context_nointerlineskip() -- figure out a better way
if row[3] then
context_blank(row[3] .. "sp")
else
context(new_glue(0))
end
else
context(list)
context(new_kern(row[2]))
if row[3] then
context(new_glue(row[3]))
end
end
end
local function total(row,distance)
local n = #row > 0 and rowdistance or 0
for i=1,#row do
local ri = row[i]
n = n + ri[2] + (ri[3] or 0)
end
return n
end
-- local function append(list,what)
-- for i=1,#what do
-- local l = what[i]
-- list[#list+1] = l[1]
-- local k = l[2] + (l[3] or 0)
-- if k ~= 0 then
-- list[#list+1] = new_kern(k)
-- end
-- end
-- end
function xtables.flush(directives) -- todo split by size / no inbetween then .. glue list kern blank
local vsize = directives.vsize
local method = directives.method or v_normal
local settings = data.settings
local results = data.results
local rowdistance = settings.rowdistance
local head = results[head_mode]
local foot = results[foot_mode]
local more = results[more_mode]
local body = results[body_mode]
local repeatheader = settings.header == v_repeat
local repeatfooter = settings.footer == v_repeat
if vsize and vsize > 0 then
context_beginvbox()
local bodystart = data.bodystart or 1
local bodystop = data.bodystop or #body
if bodystart > 0 and bodystart <= bodystop then
local bodysize = vsize
local footsize = total(foot,rowdistance)
local headsize = total(head,rowdistance)
local moresize = total(more,rowdistance)
local firstsize = body[bodystart][2]
if bodystart == 1 then -- first chunk gets head
bodysize = bodysize - headsize - footsize
if headsize > 0 and bodysize >= firstsize then
for i=1,#head do
inject(head[i],repeatheader)
end
if rowdistance > 0 then
context(new_glue(rowdistance))
end
if not repeatheader then
results[head_mode] = { }
end
end
elseif moresize > 0 then -- following chunk gets next
bodysize = bodysize - footsize - moresize
if bodysize >= firstsize then
for i=1,#more do
inject(more[i],true)
end
if rowdistance > 0 then
context(new_glue(rowdistance))
end
end
elseif headsize > 0 and repeatheader then -- following chunk gets head
bodysize = bodysize - footsize - headsize
if bodysize >= firstsize then
for i=1,#head do
inject(head[i],true)
end
if rowdistance > 0 then
context(new_glue(rowdistance))
end
end
else -- following chunk gets nothing
bodysize = bodysize - footsize
end
if bodysize >= firstsize then
for i=bodystart,bodystop do -- room for improvement
local bi = body[i]
local bs = bodysize - bi[2] - (bi[3] or 0)
if bs > 0 then
inject(bi)
bodysize = bs
bodystart = i + 1
body[i] = nil
else
break
end
end
if bodystart > bodystop then
-- all is flushed and footer fits
if footsize > 0 then
if rowdistance > 0 then
context(new_glue(rowdistance))
end
for i=1,#foot do
inject(foot[i])
end
results[foot_mode] = { }
end
results[body_mode] = { }
texsetcount("global","x_table_state",0)
else
-- some is left so footer is delayed
-- todo: try to flush a few more lines
if repeatfooter and footsize > 0 then
if rowdistance > 0 then
context(new_glue(rowdistance))
end
for i=1,#foot do
inject(foot[i],true)
end
else
-- todo: try to fit more of body
end
texsetcount("global","x_table_state",2)
end
else
if firstsize > vsize then
-- get rid of the too large cell
inject(body[bodystart])
body[bodystart] = nil
bodystart = bodystart + 1
end
texsetcount("global","x_table_state",2) -- 1
end
else
texsetcount("global","x_table_state",0)
end
data.bodystart = bodystart
data.bodystop = bodystop
context_endvbox()
else
if method == variables.split then
-- maybe also a non float mode with header/footer repeat although
-- we can also use a float without caption
for i=1,#head do
inject(head[i],false,true)
end
if #head > 0 and rowdistance > 0 then
context_blank(rowdistance .. "sp")
end
for i=1,#body do
inject(body[i],false,true)
end
if #foot > 0 and rowdistance > 0 then
context_blank(rowdistance .. "sp")
end
for i=1,#foot do
inject(foot[i],false,true)
end
else -- normal
context_beginvbox()
for i=1,#head do
inject(head[i])
end
if #head > 0 and rowdistance > 0 then
context(new_glue(rowdistance))
end
for i=1,#body do
inject(body[i])
end
if #foot > 0 and rowdistance > 0 then
context(new_glue(rowdistance))
end
for i=1,#foot do
inject(foot[i])
end
context_endvbox()
end
results[head_mode] = { }
results[body_mode] = { }
results[foot_mode] = { }
texsetcount("global","x_table_state",0)
end
end
function xtables.cleanup()
for mode, result in next, data.results do
for _, r in next, result do
flush_node_list(r[1])
end
end
data = table.remove(stack)
end
function xtables.next_row()
local r = data.currentrow + 1
data.modes[r] = texcount.x_table_mode
data.currentrow = r
data.currentcolumn = 0
end
-- eventually we might only have commands
commands.x_table_create = xtables.create
commands.x_table_reflow_width = xtables.reflow_width
commands.x_table_reflow_height = xtables.reflow_height
commands.x_table_construct = xtables.construct
commands.x_table_flush = xtables.flush
commands.x_table_cleanup = xtables.cleanup
commands.x_table_next_row = xtables.next_row
commands.x_table_init_reflow_width = xtables.initialize_reflow_width
commands.x_table_init_reflow_height = xtables.initialize_reflow_height
commands.x_table_init_construct = xtables.initialize_construct
commands.x_table_set_reflow_width = xtables.set_reflow_width
commands.x_table_set_reflow_height = xtables.set_reflow_height
commands.x_table_set_construct = xtables.set_construct
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