Re: [dev-context] Stretch charatcers

3 Dec 2012


      On 12/3/2012 10:09 AM, Wolfgang Schuster wrote:
...
Am 02.12.2012 um 23:18 schrieb Hans Hagen :
...
On 12/2/2012 4:31 PM, Wolfgang Schuster wrote:
...
Hi,
how can I write the following two lines with Lua, I saw in supp-box.lua a few example how to loop through the characters but I don’t know how I can add glue between them.
\starttext
\ruledhbox to 6cm{\processtokens{\hfil }{\hfil\hfil}{\hfil }{}{WORD}}
\ruledhbox to 6cm{\processtokens{\relax}{\hfil\hfil}{\relax}{}{WORD}}
\def\HFILLED#1{\hfil#1\hfil}
\ruledhbox to 6cm{\applytocharacters\HFILLED{WORD}}
\ruledhbox to 6cm{\hfilneg\applytocharacters\HFILLED{WORD}\hfilneg}
\stoptext
\startluacode
function commands.ws_hfilled(str)
    context.hfil()
    for c in string.utfcharacters(str) do
        context(c)
        context.hfil()
    end
end
\stopluacode
\enabletrackers[context.trace]
\def\HFILLED#1{\ctxcommand{ws_hfilled("#1")}}
\ruledhbox to 6cm{\HFILLED{WORD}}
\ruledhbox to 6cm{\hfilneg\HFILLED{WORD}\hfilneg}
This does the trick but can I check for the last char without the additional check (if n == string.utflength(str)) in the example below?
\startluacode
function commands.ws_hfilled(str,margin)
     local n = 0
     if margin then context.hfil() end
     for c in string.utfcharacters(str) do
         n = n + 1
         context(c)
         if n == string.utflength(str) then
             if margin then context.hfil() end
         else
             context.hfil()
         end
     end
end
\stopluacode
\starttext
\ruledhbox to 6cm{\ctxlua{commands.ws_hfilled("WORD")}}
\ruledhbox to 6cm{\ctxlua{commands.ws_hfilled("WORD",true)}}
\stoptext
easier:

\startluacode
function commands.ws_hfilled(str,margin)
     local done = false
     for c in string.utfcharacters(str) do
         if done or margin then
             context.hfil()
         else
             done = true
         end
         context(c)
     end
     if margin then
         context.hfil()
     end
end
\stopluacode

\starttext
\ruledhbox to 6cm{\ctxlua{commands.ws_hfilled("WORD")}}
\ruledhbox to 6cm{\ctxlua{commands.ws_hfilled("WORD",true)}}
\stoptext


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