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author | Context Git Mirror Bot <phg42.2a@gmail.com> | 2016-01-12 17:15:07 +0100 |
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committer | Context Git Mirror Bot <phg42.2a@gmail.com> | 2016-01-12 17:15:07 +0100 |
commit | 8d8d528d2ad52599f11250cfc567fea4f37f2a8b (patch) | |
tree | 94286bc131ef7d994f9432febaf03fe23d10eef8 /tex/context/base/mkiv/page-str.lua | |
parent | f5aed2e51223c36c84c5f25a6cad238b2af59087 (diff) | |
download | context-8d8d528d2ad52599f11250cfc567fea4f37f2a8b.tar.gz |
2016-01-12 16:26:00
Diffstat (limited to 'tex/context/base/mkiv/page-str.lua')
-rw-r--r-- | tex/context/base/mkiv/page-str.lua | 296 |
1 files changed, 296 insertions, 0 deletions
diff --git a/tex/context/base/mkiv/page-str.lua b/tex/context/base/mkiv/page-str.lua new file mode 100644 index 000000000..56c6167aa --- /dev/null +++ b/tex/context/base/mkiv/page-str.lua @@ -0,0 +1,296 @@ +if not modules then modules = { } end modules ['page-str'] = { + version = 1.001, + comment = "companion to page-str.mkiv", + author = "Hans Hagen, PRAGMA-ADE, Hasselt NL", + copyright = "PRAGMA ADE / ConTeXt Development Team", + license = "see context related readme files" +} + +-- streams -> managers.streams + +-- work in progresss .. unfinished + +local concat, insert, remove = table.concat, table.insert, table.remove + +local nodes, node = nodes, node + +local nodepool = nodes.pool +local tasks = nodes.tasks + +local implement = interfaces.implement + +local new_kern = nodepool.kern +local new_glyph = nodepool.glyph + +local slide_nodelist = node.slide +local write_node = node.write +local free_node = node.free +local copy_nodelist = node.copy_list +local vpack_nodelist = node.vpack +local hpack_nodelist = node.hpack + +local settings_to_array = utilities.parsers.settings_to_array + +local texgetdimen = tex.getdimen +local texgetbox = tex.getbox + +local trace_collecting = false trackers.register("streams.collecting", function(v) trace_collecting = v end) +local trace_flushing = false trackers.register("streams.flushing", function(v) trace_flushing = v end) + +local report_streams = logs.reporter("streams") + +streams = streams or { } -- might move to the builders namespace +local streams = streams + +local data, name, stack = { }, nil, { } + +function streams.enable(newname) + if newname == "default" then + name = nil + else + name = newname + end +end + +function streams.disable() + name = stack[#stack] +end + +function streams.start(newname) + insert(stack,name) + name = newname +end + +function streams.stop(newname) + name = remove(stack) +end + +function streams.collect(head,where) + if name and head and name ~= "default" then + local tail = node.slide(head) + local dana = data[name] + if not dana then + dana = { } + data[name] = dana + end + local last = dana[#dana] + if last then + local tail = slide_nodelist(last) + tail.next, head.prev = head, tail + elseif last == false then + dana[#dana] = head + else + dana[1] = head + end + if trace_collecting then + report_streams("appending snippet %a to slot %s",name,#dana) + end + return nil, true + else + return head, false + end +end + +function streams.push(thename) + if not thename or thename == "" then + thename = name + end + if thename and thename ~= "" then + local dana = data[thename] + if dana then + dana[#dana+1] = false + if trace_collecting then + report_streams("pushing snippet %a",thename) + end + end + end +end + +function streams.flush(name,copy) -- problem: we need to migrate afterwards + local dana = data[name] + if dana then + local dn = #dana + if dn == 0 then + -- nothing to flush + elseif copy then + if trace_flushing then + report_streams("flushing copies of %s slots of %a",dn,name) + end + for i=1,dn do + local di = dana[i] + if di then + write_node(copy_nodelist(di.list)) -- list, will be option + end + end + if copy then + data[name] = nil + end + else + if trace_flushing then + report_streams("flushing %s slots of %a",dn,name) + end + for i=1,dn do + local di = dana[i] + if di then + write_node(di.list) -- list, will be option + di.list = nil + free_node(di) + end + end + end + end +end + +function streams.synchronize(list) -- this is an experiment ! + -- we don't optimize this as we want to trace in detail + list = settings_to_array(list) + local max = 0 + if trace_flushing then + report_streams("synchronizing list: % t",list) + end + for i=1,#list do + local dana = data[list[i]] + if dana then + local n = #dana + if n > max then + max = n + end + end + end + if trace_flushing then + report_streams("maximum number of slots: %s",max) + end + for m=1,max do + local height, depth = 0, 0 + for i=1,#list do + local name = list[i] + local dana = data[name] + local slot = dana[m] + if slot then + local vbox = vpack_nodelist(slot) + local ht, dp = vbox.height, vbox.depth + if ht > height then + height = ht + end + if dp > depth then + depth = dp + end + dana[m] = vbox + if trace_flushing then + report_streams("slot %s of %a is packed to height %p and depth %p",m,name,ht,dp) + end + end + end + if trace_flushing then + report_streams("slot %s has max height %p and max depth %p",m,height,depth) + end + local strutht = texgetdimen("globalbodyfontstrutheight") + local strutdp = texgetdimen("globalbodyfontstrutdepth") + local struthtdp = strutht + strutdp + for i=1,#list do + local name = list[i] + local dana = data[name] + local vbox = dana[m] + if vbox then + local delta_height = height - vbox.height + local delta_depth = depth - vbox.depth + if delta_height > 0 or delta_depth > 0 then + if false then + -- actually we need to add glue and repack + vbox.height, vbox.depth = height, depth + if trace_flushing then + report_streams("slot %s of %a with delta (%p,%p) is compensated",m,i,delta_height,delta_depth) + end + else + -- this is not yet ok as we also need to keep an eye on vertical spacing + -- so we might need to do some splitting or whatever + local tail = vbox.list and slide_nodelist(vbox.list) + local n, delta = 0, delta_height -- for tracing + while delta > 0 do + -- we need to add some interline penalties + local line = copy_nodelist(texgetbox("strutbox")) + line.height, line.depth = strutht, strutdp + if tail then + tail.next, line.prev = line, tail + end + tail = line + n, delta = n +1, delta - struthtdp + end + dana[m] = vpack_nodelist(vbox.list) + vbox.list = nil + free_node(vbox) + if trace_flushing then + report_streams("slot %s:%s with delta (%p,%p) is compensated by %s lines",m,i,delta_height,delta_depth,n) + end + end + end + else + -- make dummy + end + end + end +end + +tasks.appendaction("mvlbuilders", "normalizers", "streams.collect") + +tasks.disableaction("mvlbuilders", "streams.collect") + +function streams.initialize() + tasks.enableaction ("mvlbuilders", "streams.collect") + function streams.initialize() end +end + +-- todo: remove empty last { }'s +-- todo: better names, enable etc + +implement { + name = "initializestream", + actions = streams.initialize, + onlyonce = true, +} + +implement { + name = "enablestream", + actions = streams.enable, + arguments = "string" +} + +implement { + name = "disablestream", + actions = streams.disable +} + +implement { + name = "startstream", + actions = streams.start, + arguments = "string" +} + +implement { + name = "stopstream", + actions = streams.stop +} + +implement { + name = "flushstream", + actions = streams.flush, + arguments = "string" +} + +implement { + name = "flushstreamcopy", + actions = streams.flush, + arguments = { "string", true } +} + +implement { + name = "synchronizestream", + actions = streams.synchronize, + arguments = "string" +} + +implement { + name = "pushstream", + actions = streams.push, + arguments = "string" +} |