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Diffstat (limited to 'tex/context/base/mkxl/typo-lbx.lmt')
| -rw-r--r-- | tex/context/base/mkxl/typo-lbx.lmt | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/tex/context/base/mkxl/typo-lbx.lmt b/tex/context/base/mkxl/typo-lbx.lmt new file mode 100644 index 000000000..00ba1cc7f --- /dev/null +++ b/tex/context/base/mkxl/typo-lbx.lmt @@ -0,0 +1,179 @@ +if not modules then modules = { } end modules ['typo-lbx'] = { + version = 1.001, + optimize = true, + comment = "companion to typo-lbx.mkxl", + author = "Hans Hagen, PRAGMA-ADE, Hasselt NL", + copyright = "PRAGMA ADE / ConTeXt Development Team", + license = "see context related readme files" +} + +local tostring = tostring + +local nuts = nodes.nuts + +local left_box_code = nodes.listcodes.left +local right_box_code = nodes.listcodes.right +local hlist_code = nodes.nodecodes.hlist + +local getlist = nuts.getlist +local getprev = nuts.getprev +local getnext = nuts.getnext +local getattribute = nuts.getattribute +local gettail = nuts.tail +local getwidth = nuts.getwidth +local setlist = nuts.setlist +local setoffsets = nuts.setoffsets +local flushlist = nuts.flushlist +local takebox = nuts.takebox +local setbox = nuts.setbox +local copynode = nuts.copynode +local rangedimensions = nuts.rangedimensions +local traverse_list = nuts.traversers.list + +local expandmacro = token.expandmacro + +local dimension_value = tokens.values.dimension +local integer_value = tokens.values.integer + +local implement = interfaces.implement + +typesetters = typesetters or { } +local typesetters = typesetters + +typesetters.localboxes = typesetters.localboxes or { } +local localboxes = typesetters.localboxes + +local a_localboxes = attributes.private("localboxes") + +local starttiming = statistics.starttiming +local stoptiming = statistics.stoptiming + +do + + local lb_attribute = 0 + local lb_linenumber = 0 + local lb_width = 0 + local lb_offset = 0 + local lb_leftskip = 0 + local lb_rightskip = 0 + local lb_lefthang = 0 + local lb_righthang = 0 + local lb_indent = 0 + local lb_parfillleftskip = 0 + local lb_parfillrightskip = 0 + local lb_overshoot = 0 + + implement { name = "localboxattribute", public = true, usage = "value", actions = function() return integer_value, lb_attribute end } + implement { name = "localboxlinenumber", public = true, usage = "value", actions = function() return integer_value, lb_linenumber end } + implement { name = "localboxwidth", public = true, usage = "value", actions = function() return dimension_value, lb_width end } + implement { name = "localboxoffset", public = true, usage = "value", actions = function() return dimension_value, lb_offset end } + implement { name = "localboxleftskip", public = true, usage = "value", actions = function() return dimension_value, lb_leftskip end } + implement { name = "localboxrightskip", public = true, usage = "value", actions = function() return dimension_value, lb_rightskip end } + implement { name = "localboxlefthang", public = true, usage = "value", actions = function() return dimension_value, lb_lefthang end } + implement { name = "localboxrighthang", public = true, usage = "value", actions = function() return dimension_value, lb_righthang end } + implement { name = "localboxindent", public = true, usage = "value", actions = function() return dimension_value, lb_indent end } + implement { name = "localboxparfillleftskip", public = true, usage = "value", actions = function() return dimension_value, lb_parfillleftskip end } + implement { name = "localboxparfillrightskip", public = true, usage = "value", actions = function() return dimension_value, lb_parfillrightskip end } + implement { name = "localboxovershoot", public = true, usage = "value", actions = function() return dimension_value, lb_overshoot end } + + local function action(current,where) + -- We can have nested leftboxes! + local l = getlist(current) + setlist(current) + local h = copynode(current) + setlist(h,l) + setbox("localboxcontentbox",h) + expandmacro("localboxcommand") -- no longer pass arguments + local b = takebox("localboxcontentbox") + setlist(current,b) + if where == "left" then + local w = getwidth(b) + setoffsets(b,lb_width - lb_offset - w) + else + setoffsets(b,lb_offset - lb_width) + end + end + + local function processleftbox(box,width) + local list = getlist(box) + if not width then + width = 0 + end + for current, id, subtype in traverse_list, list do + if id == hlist_code then + local a = getattribute(current,a_localboxes) + if a then + lb_attribute = a + lb_width = width + rangedimensions(box,list,getprev(current)) + action(current,"left") + end + if subtype == left_box_code then + processleftbox(current,width + rangedimensions(box,list,getprev(current))) + end + end + end + end + + local function processrightbox(box,width) + local list = getlist(box) + local tail = gettail(list) + if not width then + width = 0 + end + for current, id, subtype in traverse_list, list do + if id == hlist_code then + local a = getattribute(current,a_localboxes) + if a then + lb_attribute = a + lb_width = width + rangedimensions(box,list,getnext(current),tail) + action(current,"right") + end + if subtype == right_box_code then + processrightbox(current,width + rangedimensions(box,getnext(current),tail)) + end + end + end + end + + local function processlocalboxes(line, leftbox, rightbox, linenumber, leftskip, rightskip, lefthang, righthang, indent, parfillleftskip, parfillrightskip, overshoot) + -- + lb_attribute = 0 + lb_linenumber = linenumber + lb_width = 0 + -- lb_offset = 0 + lb_leftskip = leftskip + lb_rightskip = rightskip + lb_lefthang = lefthang + lb_righthang = righthang + lb_indent = indent + lb_parfillleftskip = parfillleftskip + lb_parfillrightskip = parfillrightskip + lb_overshoot = overshoot + -- + -- for now we always anchor + -- + if leftbox then + lb_offset = leftskip + lefthang + indent + parfillleftskip + getwidth(leftbox) + processleftbox(leftbox) + end + if rightbox then + lb_offset = rightskip + righthang + parfillrightskip + getwidth(rightbox) - overshoot + processrightbox(rightbox) + end + end + + typesetters.localboxes.handler = processlocalboxes + +end + +local localboxactions = nodes.tasks.actions("localboxes") + +function builders.local_box_filter(...) + starttiming(builders) + localboxactions(...) + stoptiming(builders) +end + +-- we register the function elsewhere + +callbacks.register("local_box_filter", builders.local_box_filter, "process local boxes") |