diff options
Diffstat (limited to 'tex/context/base/mkxl/trac-jus.lmt')
| -rw-r--r-- | tex/context/base/mkxl/trac-jus.lmt | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/tex/context/base/mkxl/trac-jus.lmt b/tex/context/base/mkxl/trac-jus.lmt new file mode 100644 index 000000000..e9c8fac28 --- /dev/null +++ b/tex/context/base/mkxl/trac-jus.lmt @@ -0,0 +1,122 @@ +if not modules then modules = { } end modules ['trac-jus'] = { + version = 1.001, + comment = "companion to trac-jus.mkiv", + author = "Hans Hagen, PRAGMA-ADE, Hasselt NL", + copyright = "PRAGMA ADE / ConTeXt Development Team", + license = "see context related readme files" +} + +local checkers = typesetters.checkers or { } +typesetters.checkers = checkers + +----- report_justification = logs.reporter("visualize","justification") + +local a_alignstate = attributes.private("alignstate") +local a_justification = attributes.private("justification") + +local nuts = nodes.nuts + +local getfield = nuts.getfield +local getlist = nuts.getlist +local getattr = nuts.getattr +local setattr = nuts.setattr +local setlist = nuts.setlist +local setlink = nuts.setlink +local getwidth = nuts.getwidth +local findtail = nuts.tail + +local nexthlist = nuts.traversers.hlist + +local getdimensions = nuts.dimensions +local copylist = nuts.copylist + +local tracedrule = nodes.tracers.pool.nuts.rule + +local nodepool = nuts.pool + +local new_hlist = nodepool.hlist +local new_kern = nodepool.kern + +local hlist_code = nodes.nodecodes.hlist + +local texsetattribute = tex.setattribute +local unsetvalue = attributes.unsetvalue + +local enableaction = nodes.tasks.enableaction + +local min_threshold = 0 +local max_threshold = 0 + +local function set(n) + enableaction("mvlbuilders", "typesetters.checkers.handler") + enableaction("vboxbuilders","typesetters.checkers.handler") + texsetattribute(a_justification,n or 1) + function typesetters.checkers.set(n) + texsetattribute(a_justification,n or 1) + end +end + +local function reset() + texsetattribute(a_justification,unsetvalue) +end + +checkers.set = set +checkers.reset = reset + +interfaces.implement { + name = "showjustification", + actions = set +} + +trackers.register("visualizers.justification", function(v) + if v then + set(1) + else + reset() + end +end) + +function checkers.handler(head) + for current in nexthlist, head do + if getattr(current,a_justification) == 1 then + setattr(current,a_justification,0) -- kind of reset + local width = getwidth(current) + if width > 0 then + local list = getlist(current) + if list then + local naturalwidth, naturalheight, naturaldepth = getdimensions(list) + local delta = naturalwidth - width + if naturalwidth == 0 or delta == 0 then + -- special box + elseif delta >= max_threshold then + local rule = new_hlist(tracedrule(delta,naturalheight,naturaldepth,getfield(list,"glueset") == 1 and "trace:dr" or "trace:db")) + setlink(findtail(list),rule) + setlist(current,list) + elseif delta <= min_threshold then + local alignstate = getattr(list,a_alignstate) + if alignstate == 1 then + local rule = new_hlist(tracedrule(-delta,naturalheight,naturaldepth,"trace:dc")) + setlink(rule,list) + setlist(current,rule) + elseif alignstate == 2 then + local lrule = new_hlist(tracedrule(-delta/2,naturalheight,naturaldepth,"trace:dy")) + local rrule = copylist(lrule) + setlink(lrule,list) + setlink(findtail(list),new_kern(delta/2),rrule) + setlist(current,lrule) + elseif alignstate == 3 then + local rule = new_hlist(tracedrule(-delta,naturalheight,naturaldepth,"trace:dm")) + setlink(findtail(list),new_kern(delta),rule) + setlist(current,list) + else + local rule = new_hlist(tracedrule(-delta,naturalheight,naturaldepth,"trace:dg")) + setlink(findtail(list),new_kern(delta),rule) + setlist(current,list) + end + end + end + end + end + end + return head +end |