diff options
Diffstat (limited to 'tex/context/base/typo-fln.lua')
| -rw-r--r-- | tex/context/base/typo-fln.lua | 293 |
1 files changed, 132 insertions, 161 deletions
diff --git a/tex/context/base/typo-fln.lua b/tex/context/base/typo-fln.lua index 322374ac0..b1a486779 100644 --- a/tex/context/base/typo-fln.lua +++ b/tex/context/base/typo-fln.lua @@ -14,126 +14,133 @@ if not modules then modules = { } end modules ['typo-fln'] = { -- todo: only letters (no punctuation) -- todo: nuts -local trace_firstlines = false trackers.register("typesetters.firstlines", function(v) trace_firstlines = v end) +local trace_firstlines = false trackers.register("typesetters.firstlines", function(v) trace_firstlines = v end) +local report_firstlines = logs.reporter("nodes","firstlines") -local report_firstlines = logs.reporter("nodes","firstlines") +typesetters.firstlines = typesetters.firstlines or { } +local firstlines = typesetters.firstlines -local nodes = nodes -local tasks = nodes.tasks +local nodes = nodes +local tasks = nodes.tasks -local nodecodes = nodes.nodecodes -local glyph = nodecodes.glyph -local rule = nodecodes.rule -local disc = nodecodes.disc +local nodecodes = nodes.nodecodes +local glyph = nodecodes.glyph +local rule = nodecodes.rule +local disc = nodecodes.disc +local kern = nodecodes.kern -local traverse_id = nodes.traverse_id -local free_node_list = nodes.flush_list -local copy_node_list = nodes.copy_list -local insert_node_after = nodes.insert_after -local hpack_node_list = nodes.hpack +local traverse_id = nodes.traverse_id +local free_node_list = nodes.flush_list +local free_node = nodes.flush_node +local copy_node_list = nodes.copy_list +local insert_node_after = nodes.insert_after +local insert_node_before = nodes.insert_before +local hpack_node_list = nodes.hpack -local hpack_filter = nodes.processors.hpack_filter +local hpack_filter = nodes.processors.hpack_filter -local newpenalty = nodes.pool.penalty +local newpenalty = nodes.pool.penalty +local newkern = nodes.pool.kern +local tracerrule = nodes.tracers.pool.nodes.rule -typesetters.firstlines = typesetters.firstlines or { } -local firstlines = typesetters.firstlines +local actions = { } +firstlines.actions = actions -local actions = { } -firstlines.actions = actions +local a_firstline = attributes.private('firstline') +local a_color = attributes.private('color') +local a_transparency = attributes.private('transparency') +local a_colorspace = attributes.private('colormodel') -local busy = false -local settings = { } +local texsetattribute = tex.setattribute +local unsetvalue = attributes.unsetvalue -local a_firstline = attributes.private('firstline') -local a_color = attributes.private('color') -local a_transparency = attributes.private('transparency') -local a_colorspace = attributes.private('colormodel') +local variables = interfaces.variables +local v_default = variables.default +local v_line = variables.line +local v_word = variables.word -local unsetvalue = attributes.unsetvalue +----- is_letter = characters.is_letter +----- categories = characters.categories -local variables = interfaces.variables +local settings = nil ------ is_letter = characters.is_letter ------ categories = characters.categories +function firstlines.set(specification) + settings = specification or { } + tasks.enableaction("processors","typesetters.firstlines.handler") + if trace_firstlines then + report_firstlines("enabling firstlines") + end + texsetattribute(a_firstline,1) +end -firstlines.actions[variables.line] = function(head,setting) +commands.setfirstline = firstlines.set + +actions[v_line] = function(head,setting) -- local attribute = fonts.specifiers.contextnumber(setting.feature) -- was experimental - local dynamic = setting.dynamic - local font = setting.font - -- make copy with dynamic feature attribute set - local list = copy_node_list(head) - for g in traverse_id(glyph,list) do + local dynamic = setting.dynamic + local font = setting.font + local noflines = setting.n or 1 + local ma = setting.ma or 0 + local ca = setting.ca + local ta = setting.ta + local hangafter = tex.hangafter + local hangindent = tex.hangindent + local parindent = tex.parindent + local nofchars = 0 + local n = 0 + local temp = copy_node_list(head) + local linebreaks = { } + for g in traverse_id(glyph,temp) do if dynamic > 0 then g[0] = dynamic end g.font = font end - local words = 0 - local nofchars = 0 - local nofwords = 1 - local going = true - local lastnofchars = 0 - local hsize = tex.hsize - tex.parindent - tex.leftskip.width - tex.rightskip.width -- can be a helper - while going do - -- (slow) stepwise pass (okay, we could do do a vsplit and stitch but why do difficult) - local temp = copy_node_list(list) - local start = temp - local ok = false - lastnofchars = nofchars - nofchars = 0 - words = 0 - local quit = false + local start = temp + local list = temp + local prev = temp + for i=1,noflines do + local hsize = tex.hsize - tex.leftskip.width - tex.rightskip.width + if i == 1 then + hsize = hsize - parindent + end + if i <= - hangafter then + hsize = hsize - hangindent + end while start do - -- also nicely quits on dics node local id = start.id if id == glyph then - -- if not is_letter[categories[start.char]] then - -- quit = true - -- elseif not ok then - if not ok then - words = words + 1 - ok = true - end - nofchars = nofchars + 1 + n = n + 1 elseif id == disc then -- this could be an option - else - quit = true - end - if quit then - ok = false - if words == nofwords then - local f = start.next - start.next = nil - free_node_list(f) + elseif id == kern then -- todo: fontkern + -- this could be an option + elseif n > 0 then + local pack = hpack_node_list(copy_node_list(list,start)) + if pack.width > hsize then + free_node_list(pack) + list = prev break + else + linebreaks[i] = n + prev = start + free_node_list(pack) + nofchars = n end - quit = false end start = start.next end - if not start then - going = false + if not linebreaks[i] then + linebreaks[i] = n end - local pack = hpack_node_list(hpack_filter(temp)) - if pack.width > hsize then - nofchars = lastnofchars - break - else - nofwords = nofwords + 1 - end - free_node_list(pack) end - -- set dynamic attribute in real list local start = head - local ma = setting.ma or 0 - local ca = setting.ca - local ta = setting.ta - while start do - local id = start.id - if id == glyph then -- or id == disc then - if nofchars > 0 then + local n = 0 + for i=1,noflines do + local linebreak = linebreaks[i] + while start and n < nofchars do + local id = start.id + if id == glyph then -- or id == disc then if dynamic > 0 then start[0] = dynamic end @@ -145,38 +152,28 @@ firstlines.actions[variables.line] = function(head,setting) if ta and ta > 0 then start[a_transparency] = ta end - nofchars = nofchars - 1 - if nofchars == 0 then - insert_node_after(head,start,newpenalty(-10000)) -- break + n = n + 1 + end + if linebreak == n then + if trace_firstlines then + head, start = insert_node_after(head,start,newpenalty(10000)) -- nobreak + head, start = insert_node_after(head,start,newkern(-65536)) + head, start = insert_node_after(head,start,tracerrule(65536,4*65536,2*65536,"darkblue")) end - else + head, start = insert_node_after(head,start,newpenalty(-10000)) -- break break end + start = start.next end - start = start.next end - -- variant (no disc nodes) - -- if false then - -- for g in traverse_id(glyph,head) do - -- if nofchars > 0 then - -- if dynamic > 0 then - -- g[0] = dynamic - -- end - -- g.font = font - -- nofchars = nofchars - 1 - -- if nofchars == 0 then - -- insert_node_after(head,g,newpenalty(-10000)) -- break - -- end - -- end - -- end - -- end + free_node_list(temp) return head, true end -firstlines.actions[variables.word] = function(head,setting) +actions[v_word] = function(head,setting) -- local attribute = fonts.specifiers.contextnumber(setting.feature) -- was experimental - local dynamic = setting.dynamic - local font = setting.font + local dynamic = setting.dynamic + local font = setting.font local words = 0 local nofwords = setting.n or 1 local start = head @@ -205,6 +202,8 @@ firstlines.actions[variables.word] = function(head,setting) start.font = font elseif id == disc then -- continue + elseif id == kern then -- todo: fontkern + -- continue else ok = false if words == nofwords then @@ -216,54 +215,37 @@ firstlines.actions[variables.word] = function(head,setting) return head, true end +actions[v_default] = actions[v_line] + local function process(namespace,attribute,head) - if not busy then - local start, attr = head, nil - while start do - attr = start[attribute] - if attr or start.id == glyph then - break - else - start = start.next - end - end + local start = head + local attr = nil + while start do + attr = start[attribute] if attr then - local setting = settings[attr] - if setting then - local action = actions[setting.alternative] - if action then - busy = true - head, done = action(head,setting) - busy = false - end - end - for g in traverse_id(glyph,head) do - -- inefficient: we could quit at unset - g[attribute] = unsetvalue + break + elseif start.id == glyph then + break + else + start = start.next + end + end + if attr then + -- here as we can process nested boxes first so we need to keep state + tasks.disableaction("processors","typesetters.firstlines.handler") + -- texsetattribute(attribute,unsetvalue) + local alternative = settings.alternative or v_default + local action = actions[alternative] or actions[v_default] + if action then + if trace_firstlines then + report_firstlines("processing firstlines, alternative %a",alternative) end - return head, true + return action(head,settings) end end return head, false end --- local enabled = false - --- function firstlines.set(n) --- if n == variables.reset or not tonumber(n) or n == 0 then --- texsetattribute(a_firstline,unsetvalue) --- else --- if not enabled then --- tasks.enableaction("processors","typesetters.firstlines.handler") --- if trace_paragraphs then --- report_firstlines("enabling firstlines") --- end --- enabled = true --- end --- texsetattribute(a_firstline,n) --- end --- end - firstlines.attribute = a_firstline firstlines.handler = nodes.installattributehandler { @@ -271,14 +253,3 @@ firstlines.handler = nodes.installattributehandler { namespace = firstlines, processor = process, } - -function firstlines.define(setting) - local n = #settings + 1 - settings[n] = setting - tasks.enableaction("processors","typesetters.firstlines.handler") - return n -end - -function commands.definefirstline(setting) - context(firstlines.define(setting)) -end |