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sile-typesetter / sile / 8736205729

18 Apr 2024 10:16AM UTC coverage: 63.747% (-11.0%) from 74.718%
8736205729

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alerque
chore(classes): Correct typos in user facing deprecation message

10118 of 15872 relevant lines covered (63.75%)

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87.5
/pagebuilders/base.lua
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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.nodefactory.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.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 " .. SILE.typesetter.frame.id .. " called with " .. #vboxlist .. " nodes, " .. 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 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) 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 badness = self.awful_bad
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      else 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 c = pi
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        elseif badness < self.inf_bad then c = badness + pi -- plus insert
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        else c = self.deplorable
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        end
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      else c = badness 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 bestBreak = i 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 onepage[#onepage] = nil 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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