underscore hyphenation and hz

[Pablo Rodriguez <oinos@gmx.es>]

Hans,

I’m afraid that underscore hyphenation has issues with font expansion:

  \startluacode
  function document.addfunnyhyphen(tfmdata)
      local underscore = utf.byte("_")
      local char       = tfmdata.characters[underscore]
      if not char then return end
      tfmdata.characters[0xFE000]   = {
          width    = 0,
          height   = 0,
          depth    = 0,
          commands = {
              { "right", -char.width },
              { "down", char.depth },
              { "slot", 1, underscore },
          }
      }
  end


  utilities.sequencers.appendaction("aftercopyingcharacters",
  "after","document.addfunnyhyphen")

  local shared = {
      start  = 1,
      length = 1,
      before = utf.char(0xFE000),
      after  = nil,
      left   = false,
      right  = false,
  }

  local all = table.setmetatableindex({ }, function(t,k)
      return shared
  end)

  languages.hyphenators.traditional.installmethod("sha",
      function(dictionary,word,n)
          return all
      end)
  \stopluacode

  \definehyphenationfeatures
     [sha]
     [characters=all,
      alternative=sha,
      righthyphenchar="FE000]

  \definefontfeature
    [default]
    [default]
    [expansion=quality]

  \setupalign[hz]
  \sethyphenationfeatures[sha]%
  \setuphyphenation[method=traditional]%

  \starttext
    \hsize\zeropoint
    abcde
  \stoptext

Many thanks for your help,

Pablo
--
http://www.ousia.tk
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