Translate text between different character sets
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created September 9, 2004 · complexity intermediate · author Breadman · version 5.7
I tend to swap double and single quotation marks around, as well as other pairs of characters. There is a transform command that I initially thought would be very helpful in script#72.
Unfortunately, the original command fails in this case. Below is an updated version which is probably slower, but more powerful, as well as a map for my favorite way to use it.
Also included is a character-switching function I developed in the process, but ended up including inline for efficiency. It turns out that directly assigning to a character in a string (let string[i] = a:new[pos]) is illegal, probably because the rhs can include more than one byte. StrSwitchPos() takes care of that, but doesn't enforce a single-byte replacement.
" Translate character sets, either in the current line, on a range, or in a string " Note that in this version, unmatched characters in old are deleted command! -nargs=* -range Transform <line1>,<line2> call Transform(<f-args>) function! Transform(old, new, ...) let string = a:0 ? a:1 : getline('.') let i = strlen(string) while i > 0 let i = i - 1 let pos = stridx(a:old, string[i]) if pos > -1 let string = strpart(string, 0, i) . a:new[pos] . strpart(string, i + 1) endif endwhile if a:0 return string else call setline('.', string) endif endfunction noremap <silent> "" :Transform "' '"<CR> " Spin-off from the above: switch a single character specified by index fun! StrSwitchPos(string, pos, char) return strpart(a:string, 0, a:pos) . a:char . strpart(a:string, a:pos + 1) endfun