diff options
Diffstat (limited to 'tex/context/base/trac-jus.lua')
| -rw-r--r-- | tex/context/base/trac-jus.lua | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/tex/context/base/trac-jus.lua b/tex/context/base/trac-jus.lua new file mode 100644 index 000000000..412ede90e --- /dev/null +++ b/tex/context/base/trac-jus.lua @@ -0,0 +1,138 @@ +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 tracers = nodes.tracers +local setcolor = tracers.colors.set +local settransparency = tracers.transparencies.set + +local new_rule = nodes.pool.rule +local new_glue = nodes.pool.glue +local new_kern = nodes.pool.kern +local concat_nodes = nodes.concat +local hpack_nodes = node.hpack +local copy_node = node.copy +local get_list_dimensions = node.dimensions +local set_attribute = node.set_attribute +local has_attribute = node.has_attribute +local hlist_code = nodes.nodecodes.hlist + +local tex_set_attribute = 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") + tex_set_attribute(a_justification,n or 1) + function typesetters.checkers.set(n) + tex_set_attribute(a_justification,n or 1) + end +end + +local function reset() + tex_set_attribute(a_justification,unsetvalue) +end + +checkers.set = set +checkers.reset = reset + +function commands.showjustification(n) + set(n) +end + +trackers.register("visualizers.justification", function(v) + if v then + set(1) + else + reset() + end +end) + +function checkers.handler(head) + for current in node.traverse_id(hlist_code,head) do + if has_attribute(current,a_justification,1) then + set_attribute(current,a_justification,0) + local width = current.width + if width > 0 then + local list = current.list + 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 = new_rule(delta,naturalheight,naturaldepth) + list = hpack_nodes(list,width,"exactly") + if list.glue_set == 1 then + setcolor(rule,"trace:dr") + settransparency(rule,"trace:dr") + else + setcolor(rule,"trace:db") + settransparency(rule,"trace:db") + end + rule = hpack_nodes(rule) + rule.width = 0 + rule.height = 0 + rule.depth = 0 + current.list = concat_nodes { list, rule } + -- current.list = concat_nodes { list, new_kern(-naturalwidth+width), rule } + elseif delta <= min_threshold then + local alignstate = has_attribute(list,a_alignstate) + if alignstate == 1 then + local rule = new_rule(-delta,naturalheight,naturaldepth) + setcolor(rule,"trace:dc") + settransparency(rule,"trace:dc") + rule = hpack_nodes(rule) + rule.height = 0 + rule.depth = 0 + rule.width = 0 + current.list = nodes.concat { rule, list } + elseif alignstate == 2 then + local rule = new_rule(-delta/2,naturalheight,naturaldepth) + setcolor(rule,"trace:dy") + settransparency(rule,"trace:dy") + rule = hpack_nodes(rule) + rule.width = 0 + rule.height = 0 + rule.depth = 0 + current.list = concat_nodes { copy_node(rule), list, new_kern(delta/2), rule } + elseif alignstate == 3 then + local rule = new_rule(-delta,naturalheight,naturaldepth) + setcolor(rule,"trace:dm") + settransparency(rule,"trace:dm") + rule = hpack_nodes(rule) + rule.height = 0 + rule.depth = 0 + current.list = concat_nodes { list, new_kern(delta), rule } + else + local rule = new_rule(-delta,naturalheight,naturaldepth) + setcolor(rule,"trace:dg") + settransparency(rule,"trace:dg") + rule = hpack_nodes(rule) + rule.height = 0 + rule.depth = 0 + rule.width = 0 + current.list = concat_nodes { list, new_kern(delta), rule } + end + end + end + end + end + end + return head +end |