diff options
Diffstat (limited to 'tex/context/base/spac-ali.lua')
| -rw-r--r-- | tex/context/base/spac-ali.lua | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/tex/context/base/spac-ali.lua b/tex/context/base/spac-ali.lua new file mode 100644 index 000000000..37bff74d1 --- /dev/null +++ b/tex/context/base/spac-ali.lua @@ -0,0 +1,132 @@ +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 tasks = nodes.tasks +local appendaction = tasks.appendaction +local prependaction = tasks.prependaction +local disableaction = tasks.disableaction +local enableaction = tasks.enableaction + +local has_attribute = node.has_attribute +local unset_attribute = node.unset_attribute +local slide_nodes = node.slide +local hpack_nodes = node.hpack -- nodes.fasthpack not really faster here + +local link_nodes = nodes.link + +local nodecodes = nodes.nodecodes +local listcodes = nodes.listcodes + +local hlist_code = nodecodes.hlist +local vlist_code = nodecodes.vlist +local line_code = listcodes.line + +local nodepool = nodes.pool + +local new_stretch = nodepool.stretch + +local a_realign = attributes.private("realign") + +local texattribute = tex.attribute +local texcount = tex.count + +local isleftpage = layouts.status.isleftpage + +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 = current.id + if id == hlist_code then + if current.subtype == line_code then + local a = has_attribute(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 + current.list = hpack_nodes(link_nodes(current.list,new_stretch(3)),current.width,"exactly") + if trace_realign then + report_realign("flush left: align %s, page %s, realpage %s",align,pageno,realpageno) + end + elseif action == 2 then + current.list = hpack_nodes(link_nodes(new_stretch(3),current.list),current.width,"exactly") + if trace_realign then + report_realign("flush right: align %s, page %s, realpage %s",align,pageno,realpageno) + end + elseif trace_realign then + report_realign("invalid: align %s, page %s, realpage %s",align,pageno,realpageno) + end + done = true + nofrealigned = nofrealigned + 1 + end + unset_attribute(current,a_realign) + end + end + handler(current.list,leftpage,realpageno) + elseif id == vlist_code then + handler(current.list,leftpage,realpageno) + end + current = current.next + end + return head, done +end + +function alignments.handler(head) + local leftpage = isleftpage(true,false) + local realpageno = texcount.realpageno + return handler(head,leftpage,realpageno) +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 + texattribute[a_realign] = texcount.realpageno * 10 + n +end + +commands.setrealign = alignments.set + +statistics.register("realigning", function() + if nofrealigned > 0 then + return string.format("%s processed",nofrealigned) + else + return nil + end +end) |