diff options
Diffstat (limited to 'tex/context/base/mkiv/spac-ali.lua')
| -rw-r--r-- | tex/context/base/mkiv/spac-ali.lua | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/tex/context/base/mkiv/spac-ali.lua b/tex/context/base/mkiv/spac-ali.lua new file mode 100644 index 000000000..a67a30133 --- /dev/null +++ b/tex/context/base/mkiv/spac-ali.lua @@ -0,0 +1,149 @@ +if not modules then modules = { } end modules ['spac-ali'] = { + version = 1.001, + comment = "companion to spac-ali.mkiv", + author = "Hans Hagen, PRAGMA-ADE, Hasselt NL", + copyright = "PRAGMA ADE / ConTeXt Development Team", + license = "see context related readme files" +} + +local div = math.div +local format = string.format + +local tasks = nodes.tasks +local enableaction = tasks.enableaction + +local nuts = nodes.nuts +local nodepool = nuts.pool + +local tonode = nuts.tonode +local tonut = nuts.tonut + +local getfield = nuts.getfield +local setfield = nuts.setfield +local getnext = nuts.getnext +local getprev = nuts.getprev +local getid = nuts.getid +local getlist = nuts.getlist +local setlist = nuts.setlist +local getattr = nuts.getattr +local setattr = nuts.setattr +local getsubtype = nuts.getsubtype + +local hpack_nodes = nuts.hpack +local linked_nodes = nuts.linked + +local unsetvalue = attributes.unsetvalue + +local nodecodes = nodes.nodecodes +local listcodes = nodes.listcodes + +local hlist_code = nodecodes.hlist +local vlist_code = nodecodes.vlist +local line_code = listcodes.line + +local new_stretch = nodepool.stretch + +local a_realign = attributes.private("realign") + +local texsetattribute = tex.setattribute +local texgetcount = tex.getcount + +local isleftpage = layouts.status.isleftpage + +typesetters = typesetters or { } +local alignments = { } +typesetters.alignments = alignments + +local report_realign = logs.reporter("typesetters","margindata") +local trace_realign = trackers.register("typesetters.margindata", function(v) trace_margindata = v end) + +local nofrealigned = 0 + +-- leftskip rightskip parfillskip +-- raggedleft 0 + 0 - +-- raggedright 0 0 fil +-- raggedcenter 0 + 0 + - + +local function handler(head,leftpage,realpageno) + local current = head + local done = false + while current do + local id = getid(current) + if id == hlist_code then + if getsubtype(current) == line_code then + local a = getattr(current,a_realign) + if not a or a == 0 then + -- skip + else + local align = a % 10 + local pageno = div(a,10) + if pageno == realpageno then + -- already ok + else + local action = 0 + if align == 1 then -- flushright + action = leftpage and 1 or 2 + elseif align == 2 then -- flushleft + action = leftpage and 2 or 1 + end + if action == 1 then + setlist(current,hpack_nodes(linked_nodes(getlist(current),new_stretch(3)),getfield(current,"width"),"exactly")) + if trace_realign then + report_realign("flushing left, align %a, page %a, realpage %a",align,pageno,realpageno) + end + elseif action == 2 then + setlist(current,hpack_nodes(linked_nodes(new_stretch(3),getlist(current)),getfield(current,"width"),"exactly")) + if trace_realign then + report_realign("flushing right. align %a, page %a, realpage %a",align,pageno,realpageno) + end + elseif trace_realign then + report_realign("invalid flushing, align %a, page %a, realpage %a",align,pageno,realpageno) + end + done = true + nofrealigned = nofrealigned + 1 + end + setattr(current,a_realign,unsetvalue) + end + end + handler(getlist(current),leftpage,realpageno) + elseif id == vlist_code then + handler(getlist(current),leftpage,realpageno) + end + current = getnext(current) + end + return head, done +end + +function alignments.handler(head) + local leftpage = isleftpage(true,false) + local realpageno = texgetcount("realpageno") + local head, done = handler(tonut(head),leftpage,realpageno) + return tonode(head), done +end + +local enabled = false + +function alignments.set(n) + if not enabled then + enableaction("shipouts","typesetters.alignments.handler") + enabled = true + if trace_realign then + report_realign("enabled") + end + end + texsetattribute(a_realign,texgetcount("realpageno") * 10 + n) +end + +interfaces.implement { + name = "setrealign", + actions = alignments.set, + arguments = "integer", +} + +statistics.register("realigning", function() + if nofrealigned > 0 then + return format("%s processed",nofrealigned) + else + return nil + end +end) |