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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,128 +1,3 @@ | ||
| return pl.class({ | ||
| SU.deprecated("core.pagebuilder", "pagebuilder.base", "0.14.6", "0.15.0") | ||
|
|
||
| _init = function (self) | ||
| self.awful_bad = 1073741823 | ||
| self.inf_bad = 10000 | ||
| self.eject_penalty = -self.inf_bad | ||
| self.deplorable = 100000 | ||
| end, | ||
|
|
||
| collateVboxes = function(_, vboxlist) | ||
| local output = SILE.nodefactory.vbox() | ||
| output:append(vboxlist) | ||
| return output | ||
| end, | ||
|
|
||
| -- Note: Almost 1/3 of the time in a typical SILE in taken iterating through | ||
| -- this function. As a result there are some micro-optimizations here that | ||
| -- make it a-typical of preferred coding styles. In particular note that | ||
| -- we absolutize heavily iterated lengths as early as possible and make | ||
| -- make direct calls to their integer amounts, assumed to be in points by | ||
| -- the point they are called **without actually checking**! | ||
| findBestBreak = function(self, options) | ||
| local vboxlist = SU.required(options, "vboxlist", "in findBestBreak") | ||
| local target = SU.required(options, "target", "in findBestBreak", "length") | ||
| local restart = options.restart or false | ||
| local force = options.force or false | ||
| local i = 0 | ||
| local totalHeight = SILE.length() | ||
| local bestBreak = nil | ||
| local started = false | ||
| if restart and restart.target == target then | ||
| totalHeight = restart.totalHeight | ||
| i = restart.i | ||
| started = restart.started | ||
| end | ||
| local leastC = self.inf_bad | ||
| SU.debug("pagebuilder", function () | ||
| return "Page builder for frame " .. SILE.typesetter.frame.id .. " called with " .. #vboxlist .. " nodes, " .. tostring(target) | ||
| end) | ||
| if SU.debugging("vboxes") then | ||
| for j, box in ipairs(vboxlist) do | ||
| SU.debug("vboxes", function () | ||
| return (j == i and " >" or " ") .. j .. ": " .. box | ||
| end) | ||
| end | ||
| end | ||
| while not started and i < #vboxlist do | ||
| i = i + 1 | ||
| if not vboxlist[i].is_vglue then | ||
| started = true | ||
| i = i - 1 | ||
| break | ||
| end | ||
| end | ||
| local pi | ||
| while i < #vboxlist do | ||
| i = i + 1 | ||
| local vbox = vboxlist[i] | ||
| SU.debug("pagebuilder", "Dealing with VBox", vbox) | ||
| if vbox.is_vbox then | ||
| totalHeight:___add(vbox.height) | ||
| totalHeight:___add(vbox.depth) | ||
| elseif vbox.is_vglue then | ||
| totalHeight:___add(vbox.height) | ||
| elseif vbox.is_insertion then | ||
| -- TODO: refactor as hook and without side effects! | ||
| target = SILE.insertions.processInsertion(vboxlist, i, totalHeight, target) | ||
| vbox = vboxlist[i] | ||
| end | ||
| local left = target - totalHeight | ||
| SU.debug("pagebuilder", "I have", left, "left") | ||
| -- if left < -20 then SU.error("\nCatastrophic page breaking failure!"); end | ||
| pi = 0 | ||
| if vbox.is_penalty then | ||
| pi = vbox.penalty | ||
| -- print("PI "..pi) | ||
| end | ||
| if vbox.is_penalty and vbox.penalty < self.inf_bad | ||
| or (vbox.is_vglue and i > 1 and not vboxlist[i-1].discardable) then | ||
| local badness | ||
| SU.debug("pagebuilder", "totalHeight", totalHeight, "with target", target) | ||
| if totalHeight.length.amount < target.length.amount then -- TeX #1039 | ||
| -- Account for infinite stretch? | ||
| badness = SU.rateBadness(self.inf_bad, left.length.amount, totalHeight.stretch.amount) | ||
| -- print("Height == "..totalHeight.length, "target=="..target, "stretch=="..totalHeight.stretch) | ||
| elseif left.length.amount < totalHeight.shrink.amount then badness = self.awful_bad | ||
| else badness = SU.rateBadness(self.inf_bad, -left.length.amount, totalHeight.shrink.amount) | ||
| end | ||
|
|
||
| local c | ||
| if badness < self.awful_bad then | ||
| if pi <= self.eject_penalty then c = pi | ||
| elseif badness < self.inf_bad then c = badness + pi -- plus insert | ||
| else c = self.deplorable | ||
| end | ||
| else c = badness end | ||
| if c < leastC then | ||
| leastC = c | ||
| bestBreak = i | ||
| else | ||
| restart = { totalHeight = totalHeight, i = i, started = started, target = target} | ||
| end | ||
| -- print("Badness "..badness .." c = "..c) | ||
| SU.debug("pagebuilder", "Badness:", c) | ||
| if c == self.awful_bad or pi <= self.eject_penalty then | ||
| SU.debug("pagebuilder", "outputting") | ||
| local onepage = {} | ||
| if not bestBreak then bestBreak = i end | ||
| for j=1,bestBreak do | ||
| onepage[j] = table.remove(vboxlist,1) | ||
| end | ||
| while(#onepage > 1 and onepage[#onepage].discardable) do onepage[#onepage] = nil end | ||
| return onepage, pi | ||
| end | ||
| end | ||
| end | ||
| SU.debug("pagebuilder", "No page break here") | ||
| if force and bestBreak then | ||
| local onepage = {} | ||
| for j=1,bestBreak do | ||
| onepage[j] = table.remove(vboxlist,1) | ||
| end | ||
| return onepage, pi | ||
| end | ||
| return false, restart | ||
| end | ||
|
|
||
| }) | ||
| return require("pagebuilders.base") |
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