French Punctuation

Set of rules for french punctuation.

can someone change the title to "french punctuation" so that the search for 'french' on the wiki ends up here

Some length

Espace fine (thin space) : one point
Espace avant-fine (eng ?) : one point and half (1pt ½)
Moyenne (half) : quart de cadratin (quart of em) (¼ em) This is the size of the small non breakable space.
Forte ou grosse : tiers de cadratin (word space) (1/3 em)

« ; », « ? », « ! » : get a thin non breakable space before if the sign before is a letter or a number (id est « !!! » or « …! » and not « ! ! ! » or « … ! »). Justified space after. The small non breakable space can vary a little to adapt the justification.
« : » : get a non breakable space before. Smaller than a normal space, bigger than a thin. x:y where 1pt < x < y and y = justified space
« : » are never stuck to another sign (« ! : » not « !: »).
« . », « , » : nothing before (not like in english). Justified space after.
« — » (em dash). When used for a parenthesis, I think we must ask people to put a « ~ » or an utf8 nbsp to notify them : « bar —~foo bar~— foo ». And the result is « barx—yfoo bary′—x′ foo ». Where x=y and x′=y′. y and y′ are non breakable spaces.
of course, in an enumeration, the space after « — » have a fix space.
« * », « † », « ‡ », « ¹ », « ² », etc. : all notes get a — realy — thin non breakable space before (sometime nothing), are before the punctuation, follow with the space depending of the punctuation.
if the note is a letter, between parenthesis, they must be in italic.
the inner space of quotation — “«” and “»” — use thin non breakable spaces. «xfoox». x = small non breakable space.

first level quotation sign are “«” and “»”, second level are « “ » and « ” ».
the sign for hyphenate and composed words is « - » the dash, not an « – » (endash). Can be set with :

\setuphyphenmark[sign=normal]

And entering composed words like this : « composed||word »

Sorry for my bad english… « translation » welcome !