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Diffstat (limited to 'tex/context/base/mkiv/typo-lin.lmt')
| -rw-r--r-- | tex/context/base/mkiv/typo-lin.lmt | 475 |
1 files changed, 0 insertions, 475 deletions
diff --git a/tex/context/base/mkiv/typo-lin.lmt b/tex/context/base/mkiv/typo-lin.lmt deleted file mode 100644 index e49f13b60..000000000 --- a/tex/context/base/mkiv/typo-lin.lmt +++ /dev/null @@ -1,475 +0,0 @@ -if not modules then modules = { } end modules ['typo-lin'] = { - version = 1.001, - comment = "companion to typo-lin.mkiv", - author = "Hans Hagen, PRAGMA-ADE, Hasselt NL", - copyright = "PRAGMA ADE / ConTeXt Development Team", - license = "see context related readme files" -} - --- This is experimental code. The idea is to create an anchor point in a line but there are --- some considerations: --- --- * if we normalize in order to have more easy access later on, we need to normalize all --- lines and we cannot catch all without losing efficiency --- --- * if we normalize too soon, we might have issues with changed properties later on --- --- * if we normalize too late, we have no knowledge of the current hsize --- --- * if we always create an anchor we also create unwanted overhead if it is not used later --- on (more nodes) --- --- The question is: do we mind of at the first access an anchor is created? As we cannot know --- that now, I choose some middle ground but this might change. if we don't assume direct --- access but only helpers, we can decide later. --- --- Because of right2left mess it makes sense to use helpers so that we only need to deal with --- this mess once, in helpers. The more abstraction there the better. And so, after a week of --- experimenting, yet another abstraction was introduced. --- --- The danger of adding the anchor later is that we adapt the head and so the caller needs to --- check that ... real messy. On the other hand, we soldom traverse the line. And other --- mechanisms can push stuff in front too. Actually that alone can mess up analysis when we --- delay too much. So in the end we need to accept the slow down. --- --- We only need to normalize the left side because when we mess around we keep the page stream --- order (and adding content to the right of the line is a no-go for tagged etc. For the same --- reason we don't use two left anchors (each side fo leftskip) because there can be stretch. --- But, maybe there are good reasons for having just that anchor (mostly for educational purposes --- I guess.) --- --- At this stage the par node is no longer of any use so we remove it (each line has the --- direction attached). We might at some point also strip the disc nodes as they no longer serve --- a purpose but that can better be a helper. Anchoring left has advantage of keeping page --- stream. --- --- This looks a bit messy but we want to keep the box as it is so \showboxes still visualizes as --- expected. Normally left and rightskips end up in the line while hangindents become shifts and --- hsize corrections. We could normalize this to a line with - --- indent : hlist type 3 --- hangindent : shift and width - -local type = type - -local trace_anchors = false trackers.register("paragraphs.anchors", function(v) trace_anchors = v end) - -local report = logs.reporter("anchors") - -local nuts = nodes.nuts -local nodecodes = nodes.nodecodes -local gluecodes = nodes.gluecodes -local listcodes = nodes.listcodes - -local hlist_code = nodecodes.hlist -local glue_code = nodecodes.glue -local kern_code = nodecodes.kern -local linelist_code = listcodes.line ------ par_code = nodecodes.par -local leftskip_code = gluecodes.leftskip -local rightskip_code = gluecodes.rightskip -local parfillskip_code = gluecodes.parfillskip - -local tonut = nodes.tonut -local tonode = nodes.tonode - -local nexthlist = nuts.traversers.hlist -local insert_before = nuts.insert_before -local insert_after = nuts.insert_after -local find_tail = nuts.tail -local rehpack = nuts.rehpack ------ remove_node = nuts.remove - -local getsubtype = nuts.getsubtype -local getlist = nuts.getlist -local setlist = nuts.setlist -local getid = nuts.getid -local getnext = nuts.getnext -local getprev = nuts.getprev -local getboth = nuts.getboth -local setlink = nuts.setlink -local setkern = nuts.setkern -local getkern = nuts.getkern -local getdirection = nuts.getdirection -local getshift = nuts.getshift -local setshift = nuts.setshift -local getwidth = nuts.getwidth -local setwidth = nuts.setwidth - -local setprop = nuts.setprop -local getprop = nuts.rawprop -- getprop - -local effectiveglue = nuts.effective_glue - -local nodepool = nuts.pool -local new_kern = nodepool.kern -local new_leftskip = nodepool.leftskip -local new_rightskip = nodepool.rightskip -local new_hlist = nodepool.hlist -local new_rule = nodepool.rule -local new_glue = nodepool.glue - -local righttoleft_code = nodes.dirvalues.righttoleft - -local texgetcount = tex.getcount -local texgetglue = tex.getglue -local setmetatableindex = table.setmetatableindex -local formatters = string.formatters - -local jobpositions = job.positions -local getposition = jobpositions.get -local getreserved = jobpositions.getreserved - -local paragraphs = { } -typesetters.paragraphs = paragraphs - -local addskips = false -- todo: use engine normalizer -local noflines = 0 - --- This is the third version, a mix between immediate (prestine lines) and delayed --- as we don't want anchors that are not used. - --- I will make a better variant once lmtx is stable i.e. less clutter. - -local function finalize(prop,key) -- delayed calculations - local line = prop.line - local hsize = prop.hsize - local width = prop.width - local shift = getshift(line) -- dangerous as it can be vertical as well - local reverse = getdirection(line) == righttoleft_code or false - local pack = new_hlist() - local head = getlist(line) - local delta = 0 - if reverse then - delta = - shift + (hsize - width) - else - delta = shift - end - local kern1 = new_kern(delta) - local kern2 = new_kern(-delta) - head = insert_before(head,head,kern1) - head = insert_before(head,head,pack) - head = insert_before(head,head,kern2) - setlist(line,head) - local where = { - pack = pack, - head = nil, - tail = nil, - } - prop.where = where - prop.reverse = reverse - prop.shift = shift - setmetatableindex(prop,nil) - return prop[key] -end - -local function normalize(line,islocal) -- assumes prestine lines, nothing pre/appended - local oldhead = getlist(line) - local head = oldhead - local leftskip = nil - local rightskip = nil - local width = getwidth(line) - local hsize = islocal and width or tex.hsize - local lskip = 0 - local rskip = 0 - local pskip = 0 - local current = head - local id = getid(current) - if id == glue_code then - local subtype = getsubtype(head) - if subtype == leftskip_code then - leftskip = head - lskip = getwidth(head) or 0 - end - current = getnext(head) - id = getid(current) - end - -- no: - -- if id == par_code then - -- head = remove_node(head,head,true) - -- end - local tail = find_tail(head) - local current = tail - local id = getid(current) - if id == glue_code then - if getsubtype(current) == rightskip_code then - rightskip = tail - rskip = getwidth(current) or 0 - current = getprev(tail) - id = getid(current) - end - if id == glue_code then - if getsubtype(current) == parfillskip_code then - pskip = effectiveglue(current,line) - end - end - end - if addskips then - if rightskip and not leftskip then - leftskip = new_leftskip(lskip) - head = insert_before(head,head,leftskip) - end - if leftskip and not rightskip then - rightskip = new_rightskip(0) - head, tail = insert_after(head,tail,rightskip) - end - end - if head ~= oldhead then - setlist(line,head) - end - noflines = noflines + 1 - local prop = { - width = width, - hsize = hsize, - leftskip = lskip, - rightskip = rskip, - parfillskip = pskip, - line = line, - number = noflines, - } - setprop(line,"line",prop) - setmetatableindex(prop,finalize) - return prop -end - -function paragraphs.checkline(n) - return getprop(n,"line") or normalize(n,true) -end - --- do we still need this: - -function paragraphs.normalize(head,islocal) - if texgetcount("pagebodymode") > 0 then - -- can be an option, maybe we need a proper state in lua itself ... is this check still needed? - return head, false - end - -- normalizer : todo, get the data, no need to normalize - for line, subtype in nexthlist, head do - if subtype == linelist_code and not getprop(line,"line") then - normalize(line) - end - end - return head, true -- true is obsolete -end - --- print(nodes.idstostring(head)) - --- We do only basic positioning and leave compensation for directions and distances --- to the caller as that one knows the circumstances better. - --- todo: only in mvl or explicitly, e.g. framed or so, not in all lines - -local function addtoline(n,list,option) - local line = getprop(n,"line") - if not line then - line = normalize(n,true) - end - if line then - if trace_anchors and not line.traced then - line.traced = true - local rule = new_rule(2*65536,2*65536,1*65536) - local list = insert_before(rule,rule,new_kern(-1*65536)) - addtoline(n,list) - local rule = new_rule(2*65536,6*65536,-3*65536) - local list = insert_before(rule,rule,new_kern(-1*65536)) - addtoline(n,list,"internal") - else - line.traced = true - end - local list = tonut(list) - local where = line.where - local head = where.head - local tail = where.tail - local blob = new_hlist(list) - local delta = 0 - if option == "internal" then - if line.reverse then - delta = line.shift - line.leftskip - (line.hsize - line.width) - else - delta = line.shift + line.leftskip - end - end - -- always kerns, also when 0 so that we can adapt but we can optimize if needed - -- by keeping a hash as long as we use the shiftinline helper .. no need to - -- optimize now .. we can also decide to put each blob in a hlist - local kern = new_kern(delta) - if tail then - head, tail = insert_after(head,tail,kern) - else - head, tail = kern, kern - setlist(where.pack,head) - end - head, tail = insert_after(head,tail,blob) - local kern = new_kern(-delta) - head, tail = insert_after(head,tail,kern) - -- - where.head = head - where.tail = tail - return line, blob - else - -- report("unknown anchor") - end -end - -local function addanchortoline(n,anchor) - local line = type(n) ~= "table" and getprop(n,"line") or n - if not line then - line = normalize(n,true) - end - if line then - local anchor = tonut(anchor) - local where = line.where - if trace_anchors then - anchor = new_hlist(setlink( - anchor, - new_kern(-65536/4), - new_rule(65536/2,4*65536,4*65536), - new_kern(-65536/4-4*65536), - new_rule(8*65536,65536/4,65536/4) - )) - setwidth(anchor,0) - end - if where.tail then - local head = where.head - insert_before(head,head,anchor) - else - where.tail = anchor - end - setlist(where.pack,anchor) - where.head = anchor - return line - end -end - -paragraphs.addtoline = addtoline -paragraphs.addanchortoline = addanchortoline - -function paragraphs.moveinline(n,blob,dx,dy) - if not blob then - return - end - if not dx then - dx = 0 - end - if not dy then - dy = 0 - end - if dx ~= 0 or dy ~= 0 then - local line = type(n) ~= "table" and getprop(n,"line") or n - if line then - if dx ~= 0 then - local prev, next = getboth(blob) - if prev and getid(prev) == kern_code then - setkern(prev,getkern(prev) + dx) - end - if next and getid(next) == kern_code then - setkern(next,getkern(next) - dx) - end - end - if dy ~= 0 then - if getid(blob) == hlist_code then - setshift(blob,getshift(blob) + dy) - end - end - else --- report("no line") - end - end -end - -local latelua = nodepool.latelua -local setposition = jobpositions.setspec - -local function setanchor(h_anchor) - return latelua { - action = setposition, - name = "md:h", - index = h_anchor, - value = { x = true, c = true }, - } -end - -function paragraphs.calculatedelta(n,width,delta,atleft,islocal,followshape,area) - local line = type(n) ~= "table" and getprop(n,"line") or n - if not line then - line = normalize(n,true) - end - local hmove = 0 - if line then - local reverse = line.reverse - -- basic hsize based anchoring - if atleft then - if reverse then - -- delta = delta - else - delta = - delta - width - end - else - if reverse then - delta = - delta - width - line.hsize - else - delta = delta + line.hsize - end - end - if islocal then - -- relative to hsize with leftskip / rightskip compensation - if atleft then - if reverse then - delta = delta - line.leftskip - else - delta = delta + line.leftskip - end - else - if reverse then - delta = delta + line.rightskip - else - delta = delta - line.rightskip - end - end - if followshape then - -- shape compensation - if atleft then - if reverse then - delta = delta + line.shift - line.hsize + line.width - else - delta = delta + line.shift - end - else - if reverse then - delta = delta + line.shift + line.parfillskip - else - delta = delta + line.shift - line.hsize + line.width - line.parfillskip - end - end - end - end - if area then - local number = line.number - if not line.hanchor then - addanchortoline(line,setanchor(number)) - line.hanchor = true - end - local blob = getposition(s_anchor,number) - if blob then - local reference = getreserved(area,blob.c) - if reference then - hmove = (reference.x or 0) - (blob.x or 0) - if atleft then - if reverse then - hmove = hmove + (reference.w or 0) - else - -- hmove = hmove - end - else - if reverse then - hmove = hmove + line.hsize - else - hmove = hmove + (reference.w or 0) - line.hsize - end - end - end - end - end - end - return delta, hmove -end |