diff options
Diffstat (limited to 'Master/texmf-dist/tex/context/base/mkiv/trac-jus.lua')
-rw-r--r-- | Master/texmf-dist/tex/context/base/mkiv/trac-jus.lua | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/Master/texmf-dist/tex/context/base/mkiv/trac-jus.lua b/Master/texmf-dist/tex/context/base/mkiv/trac-jus.lua new file mode 100644 index 00000000000..ad1a098e27f --- /dev/null +++ b/Master/texmf-dist/tex/context/base/mkiv/trac-jus.lua @@ -0,0 +1,115 @@ +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 tonut = nuts.tonut + +local getfield = nuts.getfield +local setfield = nuts.setfield +local getlist = nuts.getlist +local getattr = nuts.getattr +local setattr = nuts.setattr +local setlist = nuts.setlist + +local traverse_id = nuts.traverse_id +local get_list_dimensions = nuts.dimensions +local linked_nodes = nuts.linked +local copy_node = nuts.copy + +local tracedrule = nodes.tracers.pool.nuts.rule + +local nodepool = nuts.pool + +local new_rule = nodepool.rule +local new_hlist = nodepool.hlist +local new_glue = nodepool.glue +local new_kern = nodepool.kern + +local hlist_code = nodes.nodecodes.hlist + +local texsetattribute = tex.setattribute +local unsetvalue = attributes.unsetvalue + +local min_threshold = 0 +local max_threshold = 0 + +local function set(n) + nodes.tasks.enableaction("mvlbuilders", "typesetters.checkers.handler") + nodes.tasks.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 traverse_id(hlist_code,tonut(head)) do + if getattr(current,a_justification) == 1 then + setattr(current,a_justification,0) -- kind of reset + local width = getfield(current,"width") + if width > 0 then + local list = getlist(current) + if list then + local naturalwidth, naturalheight, naturaldepth = get_list_dimensions(list) + local delta = naturalwidth - width + if naturalwidth == 0 or delta == 0 then + -- special box + elseif delta >= max_threshold then + local rule = tracedrule(delta,naturalheight,naturaldepth,getfield(list,"glue_set") == 1 and "trace:dr" or "trace:db") + setlist(current,linked_nodes(list,new_hlist(rule))) + elseif delta <= min_threshold then + local alignstate = getattr(list,a_alignstate) + if alignstate == 1 then + local rule = tracedrule(-delta,naturalheight,naturaldepth,"trace:dc") + setlist(current,linked_nodes(new_hlist(rule),list)) + elseif alignstate == 2 then + local lrule = tracedrule(-delta/2,naturalheight,naturaldepth,"trace:dy") + local rrule = copy_node(lrule) + setlist(current,linked_nodes(new_hlist(lrule),list,new_kern(delta/2),new_hlist(rrule))) + elseif alignstate == 3 then + local rule = tracedrule(-delta,naturalheight,naturaldepth,"trace:dm") + setlist(current,linked_nodes(list,new_kern(delta),new_hlist(rule))) + else + local rule = tracedrule(-delta,naturalheight,naturaldepth,"trace:dg") + setlist(current,linked_nodes(list,new_kern(delta),new_hlist(rule))) + end + end + end + end + end + end + return head +end |