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sile-typesetter / sile / 14859255754

06 May 2025 12:08PM UTC coverage: 56.689% (-3.2%) from 59.865%
14859255754

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alerque
fix(build): Pass --enable-debug through to Cargo to actually get a debug-enabled binary

12191 of 21505 relevant lines covered (56.69%)

3298.74 hits per line

Source File
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82.65
/pagebuilders/base.lua
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--- SILE pagebuilder class.
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-- @interfaces pagebuilders
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local pagebuilder = pl.class()
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pagebuilder.type = "pagebuilder"
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pagebuilder._name = "base"
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function pagebuilder:_init ()
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   self.awful_bad = 1073741823
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   self.inf_bad = 10000
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   self.eject_penalty = -self.inf_bad
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   self.deplorable = 100000
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end
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function pagebuilder:collateVboxes (vboxlist)
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   local output = SILE.types.node.vbox()
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   output:append(vboxlist)
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   return output
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end
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-- Note: Almost 1/3 of the time in a typical SILE in taken iterating through
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-- this function. As a result there are some micro-optimizations here that
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-- make it a-typical of preferred coding styles. In particular note that
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-- we absolutize heavily iterated lengths as early as possible and make
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-- make direct calls to their integer amounts, assumed to be in points by
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-- the point they are called **without actually checking**!
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function pagebuilder:findBestBreak (options)
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   local vboxlist = SU.required(options, "vboxlist", "in findBestBreak")
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   local target = SU.required(options, "target", "in findBestBreak", "length")
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   local restart = options.restart or false
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   local force = options.force or false
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   local i = 0
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   local totalHeight = SILE.types.length()
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   local bestBreak = nil
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   local started = false
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   if restart and restart.target == target then
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      totalHeight = restart.totalHeight
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      i = restart.i
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      started = restart.started
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   end
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   local leastC = self.inf_bad
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   SU.debug("pagebuilder", function ()
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      return "Page builder for frame "
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         .. SILE.typesetter.frame.id
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         .. " called with "
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         .. #vboxlist
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         .. " nodes, "
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         .. tostring(target)
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   end)
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   if SU.debugging("vboxes") then
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      for j, box in ipairs(vboxlist) do
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         SU.debug("vboxes", function ()
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            return (j == i and " >" or "  ") .. j .. ": " .. box
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         end)
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      end
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   end
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   while not started and i < #vboxlist do
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      i = i + 1
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      if not vboxlist[i].is_vglue then
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         started = true
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         i = i - 1
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         break
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      end
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   end
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   local pi
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   while i < #vboxlist do
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      i = i + 1
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      local vbox = vboxlist[i]
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      SU.debug("pagebuilder", "Dealing with VBox", vbox)
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      if vbox.is_vbox then
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         totalHeight:___add(vbox.height)
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         totalHeight:___add(vbox.depth)
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      elseif vbox.is_vglue then
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         totalHeight:___add(vbox.height)
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      elseif vbox.is_insertion then
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         -- TODO: refactor as hook and without side effects!
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         target = SILE.insertions.processInsertion(vboxlist, i, totalHeight, target)
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         vbox = vboxlist[i]
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      end
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      local left = target - totalHeight
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      SU.debug("pagebuilder", "I have", left, "left")
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      -- if left < -20 then SU.error("\nCatastrophic page breaking failure!"); end
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      pi = 0
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      if vbox.is_penalty then
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         pi = vbox.penalty
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      end
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      if
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         vbox.is_penalty and vbox.penalty < self.inf_bad
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         or (vbox.is_vglue and i > 1 and not vboxlist[i - 1].discardable)
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      then
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         local badness
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         SU.debug("pagebuilder", "totalHeight", totalHeight, "with target", target)
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         if totalHeight.length.amount < target.length.amount then -- TeX #1039
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            -- Account for infinite stretch?
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            badness = SU.rateBadness(self.inf_bad, left.length.amount, totalHeight.stretch.amount)
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         elseif left.length.amount < totalHeight.shrink.amount then
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            badness = self.awful_bad
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         else
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            badness = SU.rateBadness(self.inf_bad, -left.length.amount, totalHeight.shrink.amount)
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         end
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         local c
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         if badness < self.awful_bad then
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            if pi <= self.eject_penalty then
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               c = pi
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            elseif badness < self.inf_bad then
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               c = badness + pi -- plus insert
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            else
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               c = self.deplorable
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            end
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         else
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            c = badness
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         end
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         if c < leastC then
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            leastC = c
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            bestBreak = i
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         else
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            restart = { totalHeight = totalHeight, i = i, started = started, target = target }
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         end
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         SU.debug("pagebuilder", "Badness:", c)
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         if c == self.awful_bad or pi <= self.eject_penalty then
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            SU.debug("pagebuilder", "outputting")
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            local onepage = {}
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            if not bestBreak then
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               bestBreak = i
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            end
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            for j = 1, bestBreak do
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               onepage[j] = table.remove(vboxlist, 1)
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            end
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            while #onepage > 1 and onepage[#onepage].discardable do
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               onepage[#onepage] = nil
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            end
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            return onepage, pi
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         end
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      end
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   end
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   SU.debug("pagebuilder", "No page break here")
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   if force and bestBreak then
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      local onepage = {}
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      for j = 1, bestBreak do
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         onepage[j] = table.remove(vboxlist, 1)
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      end
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      return onepage, pi
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   end
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   return false, restart
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end
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return pagebuilder
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