On Tuesday, June 23, 2015 at 4:20:32 PM UTC-5, ZyX wrote: > 2015-06-24 0:02 GMT+03:00 Ben Fritz <[email protected]>: > > On Tuesday, June 23, 2015 at 3:35:50 PM UTC-5, Ben Fritz wrote: > >> I'm working on a custom command to add strikethrough to text, using the > >> Unicode COMBINING LONG STROKE OVERLAY, 0x0336. > >> > >> In this command, I want to apply a strikethrough to a character, only if > >> it is not already present. > >> > >> This pattern fails because it doesn't match *anything* with regexpengine > >> set to 2, it does not match an unadorned character immediately before a > >> struck-through base character, and it *does* match the last combining > >> character in a word for some reason: > >> > >> [^\u0336]\%u0336\@! > >> > >> This pattern also fails, because it matches already struck-through base > >> characters for some reason (although it does the same thing in both > >> engines): > >> > >> [^\u0336][^\u0336]\@= > >> > >> What is the correct way to do this? > >> > >> Full command (attempted): > >> > >> '<,'>s;\%#=1\%V[^\u0336]\%u0336\@!;\=submatch(0)."\u0336";g > >> > >> Note, how I'm also limiting to a visual selection; so I'm trying to use > >> the :s command for simplicity. > > > > My next attempt is to do two passes, first to remove the combining > > character from everywhere in the visual selection, and then to add it to > > the entire visual selection. > > > > But, my patterns for this task either don't match at all, or they remove > > the base character along with the combining character! Even this doesn't > > work, it removes the base character: > > > > echo join(split(getline('.'), "\u0336"),"") > > Though there is always one hack to get exactly one unicode codepoint > from *valid* UTF-8 string: > > echo nr2char(char2nr(string[position :])) > > . You can use `len(nr2char(…))` to get the length of the first > character and thus get to the second. I think this will allow you to > construct needed \= expression, but the result would most likely be a > definition of a new function due to its complexity. >
Thanks! I agree this needs to be better supported in Vim's regex and tr() function. For my purposes I can pretty much always assume any combining characters are the strikethrough characters, making the replacement function trivial to implement with a nr2char(char2nr(submatch(0))) hack, but obviously this is not a good general solution as it will strip off all other combining characters when adding or removing the one character I'm actually interested in. I guess I could loop through the input string as you suggest if I'm interested in making a general solution at some point. -- -- You received this message from the "vim_use" maillist. Do not top-post! Type your reply below the text you are replying to. For more information, visit http://www.vim.org/maillist.php --- You received this message because you are subscribed to the Google Groups "vim_use" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
