sile 0.14.8

Simon’s Improved Layout Engine
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local base = require("typesetters.base")

local typesetter = pl.class(base)
typesetter._name = "grid"

local function makeUp (spacing, totals)
  local toadd = (spacing - SILE.measurement(totals.gridCursor)) % spacing
  totals.gridCursor = totals.gridCursor + toadd
  SU.debug("typesetter", "Makeup height =", toadd)
  return SILE.nodefactory.vglue({ discardable = false, gridleading = true, height = toadd })
end

function typesetter:_init(frame)
  base._init(self, frame)
  self.options = { spacing = SILE.measurement("1bs") }
end

function typesetter:leadingFor (vbox, previous)
  SU.debug("typesetter", "   Considering leading between two lines (grid mode):")
  SU.debug("typesetter", "   1)", previous)
  SU.debug("typesetter", "   2)", vbox)
  if not previous then return SILE.nodefactory.vglue() end
  SU.debug("typesetter", "   Depth of previous line was", previous.depth)
  local totals = self.frame.state.totals
  local oldCursor = SILE.measurement(totals.gridCursor)
  totals.gridCursor = oldCursor + vbox.height:absolute() + previous.depth
  SU.debug("typesetter", "   Cursor change =", totals.gridCursor - oldCursor)
  return makeUp(self.options.spacing, self.frame.state.totals)
end

function typesetter:pushVglue (spec)
  -- if SU.type(spec) ~= "table" then SU.warn("Please use pushVertical() to pass a premade node instead of a spec") end
  local node = SU.type(spec) == "vglue" and spec or SILE.nodefactory.vglue(spec)
  node.height.stretch = SILE.measurement()
  node.height.shrink = SILE.measurement()
  local totals = self.frame.state.totals
  totals.gridCursor = totals.gridCursor + SILE.measurement(node.height):absolute()
  self:pushVertical(node)
  self:pushVertical(makeUp(self.options.spacing, self.frame.state.totals))
  return node
end

function typesetter:pushExplicitVglue (spec)
  -- if SU.type(spec) ~= "table" then SU.warn("Please use pushVertical() to pass a premade node instead of a spec") end
  local node = SU.type(spec) == "vglue" and spec or SILE.nodefactory.vglue(spec)
  node.explicit = true
  node.discardable = false
  node.height.stretch = SILE.measurement()
  node.height.shrink = SILE.measurement()
  local totals = self.frame.state.totals
  totals.gridCursor = totals.gridCursor + SILE.measurement(node.height):absolute()
  self:pushVertical(node)
  self:pushVertical(makeUp(self.options.spacing, self.frame.state.totals))
  return node
end


return typesetter