sile 0.15.12

Simon’s Improved Layout Engine
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36

local base = require("typesetters.base")

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

function typesetter:breakIntoLines (nl, breakWidth)
   local breaks = {}
   local length = SILE.types.length()
   for i = 1, #nl do
      local n = nl[i]
      if n.is_box then
         SU.debug("break", n, function ()
            return n:lineContribution()
         end)
         length = length + n:lineContribution()
         SU.debug("break", " Length now ", length, "breakwidth", breakWidth)
      end
      if not n.is_box or n.isHangable then
         SU.debug("break", n)
         if n.is_glue then
            length = length + n.width:absolute()
         end
         SU.debug("break", " Length now ", length, " breakwidth ", breakWidth)
         -- Can we break?
         if length:tonumber() >= breakWidth:tonumber() then
            SU.debug("break", "Breaking!")
            breaks[#breaks + 1] = { position = i, width = breakWidth }
            length = SILE.types.length()
         end
      end
   end
   breaks[#breaks + 1] = { position = #nl, width = breakWidth }
   return self:breakpointsToLines(breaks)
end

return typesetter