On 18-2-2012 12:08, Paul Isambert wrote:
Hello all,
I've found some strange behavior with hyphenation; but since hyphenation has been discussed frequently, and might involve some settings in conf files somewhere I'm not aware of, I wouldn't like to submit an unnecessary tracker item in case the problem is well known. The code is:
\hsize=0pt \overfullrule=0pt \hyphenation{W-h-a-t-e-v-e-r}
\uchyph=1 Acceptation Behavior Dying Expression Whatever
\uchyph=0 Acceptation Behavior Dying Expression Whatever \bye
And comparing the plain TeX compilation in PDFTeX and LuaTeX (all from TL2011, except LuaTeX, which is rev 4358), I notice that:
- LuaTeX doesn't obey \uchyph=0; it does hyphenate the words, although not as completely as when \uchyph=1.
I must admit that I never used \uchyph (and even wonder if we really need it as it's a kind of tweaking that seldom is done at the document level). I would have expected this primitive to do nothing at all in luatex.
- "Acceptation" is hyphenated in LuaTeX even though it's the first word, and a hyphenable word should be preceded by a glue (see TeXbook p.256); it is not hyphenated in PDFTeX.
luatex hyphenates the whole list in one go and does not do this delayed and partial as in traditional tex ... this is on purpose as it provides callback code with the whole lot (in luatex the hyphenation / ligature building and justification steps are separated) ... also, there is no reason not to hyphenate the first word if you have real narrow columns.
- As shown by the hyphenation of "Whatever", LuaTeX disregards \lefthyphenmin and \righthypenmin.
Explicit \hyphenation always wins and is not influenced by the *min values (after all, it is mostly meant as a an escape for providing exceptions and not for extending the patterns so obeying the *min parameters would defeat that purpose). Hans ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com | www.pragma-pod.nl -----------------------------------------------------------------