source: issm/oecreview/Archive/14312-15392/ISSM-14736-14737.diff

../trunk-jpl/externalpackages/vim/addons/vim/plugin/matchit.vim

@@ +1 @@
+"  matchit.vim: (global plugin) Extended "%" matching
+"  Last Change: Fri Jan 25 10:00 AM 2008 EST
+"  Maintainer:  Benji Fisher PhD   <benji@member.AMS.org>
+"  Version:     1.13.2, for Vim 6.3+
+"  URL:         http://www.vim.org/script.php?script_id=39
+
+" Documentation:
+"  The documentation is in a separate file, matchit.txt .
+
+" Credits:
+"  Vim editor by Bram Moolenaar (Thanks, Bram!)
+"  Original script and design by Raul Segura Acevedo
+"  Support for comments by Douglas Potts
+"  Support for back references and other improvements by Benji Fisher
+"  Support for many languages by Johannes Zellner
+"  Suggestions for improvement, bug reports, and support for additional
+"  languages by Jordi-Albert Batalla, Neil Bird, Servatius Brandt, Mark
+"  Collett, Stephen Wall, Dany St-Amant, Yuheng Xie, and Johannes Zellner.
+
+" Debugging:
+"  If you'd like to try the built-in debugging commands...
+"   :MatchDebug      to activate debugging for the current buffer
+"  This saves the values of several key script variables as buffer-local
+"  variables.  See the MatchDebug() function, below, for details.
+
+" TODO:  I should think about multi-line patterns for b:match_words.
+"   This would require an option:  how many lines to scan (default 1).
+"   This would be useful for Python, maybe also for *ML.
+" TODO:  Maybe I should add a menu so that people will actually use some of
+"   the features that I have implemented.
+" TODO:  Eliminate the MultiMatch function.  Add yet another argument to
+"   Match_wrapper() instead.
+" TODO:  Allow :let b:match_words = '\(\(foo\)\(bar\)\):\3\2:end\1'
+" TODO:  Make backrefs safer by using '\V' (very no-magic).
+" TODO:  Add a level of indirection, so that custom % scripts can use my
+"   work but extend it.
+
+" allow user to prevent loading
+" and prevent duplicate loading
+if exists("loaded_matchit") || &cp
+  finish
+endif
+let loaded_matchit = 1
+let s:last_mps = ""
+let s:last_words = ":"
+
+let s:save_cpo = &cpo
+set cpo&vim
+
+nnoremap <silent> %  :<C-U>call <SID>Match_wrapper('',1,'n') <CR>
+nnoremap <silent> g% :<C-U>call <SID>Match_wrapper('',0,'n') <CR>
+vnoremap <silent> %  :<C-U>call <SID>Match_wrapper('',1,'v') <CR>m'gv``
+vnoremap <silent> g% :<C-U>call <SID>Match_wrapper('',0,'v') <CR>m'gv``
+onoremap <silent> %  v:<C-U>call <SID>Match_wrapper('',1,'o') <CR>
+onoremap <silent> g% v:<C-U>call <SID>Match_wrapper('',0,'o') <CR>
+
+" Analogues of [{ and ]} using matching patterns:
+nnoremap <silent> [% :<C-U>call <SID>MultiMatch("bW", "n") <CR>
+nnoremap <silent> ]% :<C-U>call <SID>MultiMatch("W",  "n") <CR>
+vmap [% <Esc>[%m'gv``
+vmap ]% <Esc>]%m'gv``
+" vnoremap <silent> [% :<C-U>call <SID>MultiMatch("bW", "v") <CR>m'gv``
+" vnoremap <silent> ]% :<C-U>call <SID>MultiMatch("W",  "v") <CR>m'gv``
+onoremap <silent> [% v:<C-U>call <SID>MultiMatch("bW", "o") <CR>
+onoremap <silent> ]% v:<C-U>call <SID>MultiMatch("W",  "o") <CR>
+
+" text object:
+vmap a% <Esc>[%v]%
+
+" Auto-complete mappings:  (not yet "ready for prime time")
+" TODO Read :help write-plugin for the "right" way to let the user
+" specify a key binding.
+"   let g:match_auto = '<C-]>'
+"   let g:match_autoCR = '<C-CR>'
+" if exists("g:match_auto")
+"   execute "inoremap " . g:match_auto . ' x<Esc>"=<SID>Autocomplete()<CR>Pls'
+" endif
+" if exists("g:match_autoCR")
+"   execute "inoremap " . g:match_autoCR . ' <CR><C-R>=<SID>Autocomplete()<CR>'
+" endif
+" if exists("g:match_gthhoh")
+"   execute "inoremap " . g:match_gthhoh . ' <C-O>:call <SID>Gthhoh()<CR>'
+" endif " gthhoh = "Get the heck out of here!"
+
+let s:notslash = '\\\@<!\%(\\\\\)*'
+
+function! s:Match_wrapper(word, forward, mode) range
+  " In s:CleanUp(), :execute "set" restore_options .
+  let restore_options = (&ic ? " " : " no") . "ignorecase"
+  if exists("b:match_ignorecase")
+    let &ignorecase = b:match_ignorecase
+  endif
+  let restore_options = " ve=" . &ve . restore_options
+  set ve=
+  " If this function was called from Visual mode, make sure that the cursor
+  " is at the correct end of the Visual range:
+  if a:mode == "v"
+    execute "normal! gv\<Esc>"
+  endif
+  " In s:CleanUp(), we may need to check whether the cursor moved forward.
+  let startline = line(".")
+  let startcol = col(".")
+  " Use default behavior if called with a count.
+  if v:count
+    exe "normal! " . v:count . "%"
+    return s:CleanUp(restore_options, a:mode, startline, startcol)
+  end
+
+  " First step:  if not already done, set the script variables
+  "   s:do_BR   flag for whether there are backrefs
+  "   s:pat     parsed version of b:match_words
+  "   s:all     regexp based on s:pat and the default groups
+  "
+  if !exists("b:match_words") || b:match_words == ""
+    let match_words = ""
+    " Allow b:match_words = "GetVimMatchWords()" .
+  elseif b:match_words =~ ":"
+    let match_words = b:match_words
+  else
+    execute "let match_words =" b:match_words
+  endif
+" Thanks to Preben "Peppe" Guldberg and Bram Moolenaar for this suggestion!
+  if (match_words != s:last_words) || (&mps != s:last_mps) ||
+    \ exists("b:match_debug")
+    let s:last_words = match_words
+    let s:last_mps = &mps
+    " The next several lines were here before
+    " BF started messing with this script.
+    " quote the special chars in 'matchpairs', replace [,:] with \| and then
+    " append the builtin pairs (/*, */, #if, #ifdef, #else, #elif, #endif)
+    " let default = substitute(escape(&mps, '[$^.*~\\/?]'), '[,:]\+',
+    "  \ '\\|', 'g').'\|\/\*\|\*\/\|#if\>\|#ifdef\>\|#else\>\|#elif\>\|#endif\>'
+    let default = escape(&mps, '[$^.*~\\/?]') . (strlen(&mps) ? "," : "") .
+      \ '\/\*:\*\/,#if\%(def\)\=:#else\>:#elif\>:#endif\>'
+    " s:all = pattern with all the keywords
+    let match_words = match_words . (strlen(match_words) ? "," : "") . default
+    if match_words !~ s:notslash . '\\\d'
+      let s:do_BR = 0
+      let s:pat = match_words
+    else
+      let s:do_BR = 1
+      let s:pat = s:ParseWords(match_words)
+    endif
+    let s:all = substitute(s:pat, s:notslash . '\zs[,:]\+', '\\|', 'g')
+    let s:all = '\%(' . s:all . '\)'
+    " let s:all = '\%(' . substitute(s:all, '\\\ze[,:]', '', 'g') . '\)'
+    if exists("b:match_debug")
+      let b:match_pat = s:pat
+    endif
+  endif
+
+  " Second step:  set the following local variables:
+  "     matchline = line on which the cursor started
+  "     curcol    = number of characters before match
+  "     prefix    = regexp for start of line to start of match
+  "     suffix    = regexp for end of match to end of line
+  " Require match to end on or after the cursor and prefer it to
+  " start on or before the cursor.
+  let matchline = getline(startline)
+  if a:word != ''
+    " word given
+    if a:word !~ s:all
+      echohl WarningMsg|echo 'Missing rule for word:"'.a:word.'"'|echohl NONE
+      return s:CleanUp(restore_options, a:mode, startline, startcol)
+    endif
+    let matchline = a:word
+    let curcol = 0
+    let prefix = '^\%('
+    let suffix = '\)$'
+  " Now the case when "word" is not given
+  else  " Find the match that ends on or after the cursor and set curcol.
+    let regexp = s:Wholematch(matchline, s:all, startcol-1)
+    let curcol = match(matchline, regexp)
+    " If there is no match, give up.
+    if curcol == -1
+      return s:CleanUp(restore_options, a:mode, startline, startcol)
+    endif
+    let endcol = matchend(matchline, regexp)
+    let suf = strlen(matchline) - endcol
+    let prefix = (curcol ? '^.*\%'  . (curcol + 1) . 'c\%(' : '^\%(')
+    let suffix = (suf ? '\)\%' . (endcol + 1) . 'c.*$'  : '\)$')
+  endif
+  if exists("b:match_debug")
+    let b:match_match = matchstr(matchline, regexp)
+    let b:match_col = curcol+1
+  endif
+
+  " Third step:  Find the group and single word that match, and the original
+  " (backref) versions of these.  Then, resolve the backrefs.
+  " Set the following local variable:
+  " group = colon-separated list of patterns, one of which matches
+  "       = ini:mid:fin or ini:fin
+  "
+  " Reconstruct the version with unresolved backrefs.
+  let patBR = substitute(match_words.',',
+    \ s:notslash.'\zs[,:]*,[,:]*', ',', 'g')
+  let patBR = substitute(patBR, s:notslash.'\zs:\{2,}', ':', 'g')
+  " Now, set group and groupBR to the matching group: 'if:endif' or
+  " 'while:endwhile' or whatever.  A bit of a kluge:  s:Choose() returns
+  " group . "," . groupBR, and we pick it apart.
+  let group = s:Choose(s:pat, matchline, ",", ":", prefix, suffix, patBR)
+  let i = matchend(group, s:notslash . ",")
+  let groupBR = strpart(group, i)
+  let group = strpart(group, 0, i-1)
+  " Now, matchline =~ prefix . substitute(group,':','\|','g') . suffix
+  if s:do_BR " Do the hard part:  resolve those backrefs!
+    let group = s:InsertRefs(groupBR, prefix, group, suffix, matchline)
+  endif
+  if exists("b:match_debug")
+    let b:match_wholeBR = groupBR
+    let i = matchend(groupBR, s:notslash . ":")
+    let b:match_iniBR = strpart(groupBR, 0, i-1)
+  endif
+
+  " Fourth step:  Set the arguments for searchpair().
+  let i = matchend(group, s:notslash . ":")
+  let j = matchend(group, '.*' . s:notslash . ":")
+  let ini = strpart(group, 0, i-1)
+  let mid = substitute(strpart(group, i,j-i-1), s:notslash.'\zs:', '\\|', 'g')
+  let fin = strpart(group, j)
+  "Un-escape the remaining , and : characters.
+  let ini = substitute(ini, s:notslash . '\zs\\\(:\|,\)', '\1', 'g')
+  let mid = substitute(mid, s:notslash . '\zs\\\(:\|,\)', '\1', 'g')
+  let fin = substitute(fin, s:notslash . '\zs\\\(:\|,\)', '\1', 'g')
+  " searchpair() requires that these patterns avoid \(\) groups.
+  let ini = substitute(ini, s:notslash . '\zs\\(', '\\%(', 'g')
+  let mid = substitute(mid, s:notslash . '\zs\\(', '\\%(', 'g')
+  let fin = substitute(fin, s:notslash . '\zs\\(', '\\%(', 'g')
+  " Set mid.  This is optimized for readability, not micro-efficiency!
+  if a:forward && matchline =~ prefix . fin . suffix
+    \ || !a:forward && matchline =~ prefix . ini . suffix
+    let mid = ""
+  endif
+  " Set flag.  This is optimized for readability, not micro-efficiency!
+  if a:forward && matchline =~ prefix . fin . suffix
+    \ || !a:forward && matchline !~ prefix . ini . suffix
+    let flag = "bW"
+  else
+    let flag = "W"
+  endif
+  " Set skip.
+  if exists("b:match_skip")
+    let skip = b:match_skip
+  elseif exists("b:match_comment") " backwards compatibility and testing!
+    let skip = "r:" . b:match_comment
+  else
+    let skip = 's:comment\|string'
+  endif
+  let skip = s:ParseSkip(skip)
+  if exists("b:match_debug")
+    let b:match_ini = ini
+    let b:match_tail = (strlen(mid) ? mid.'\|' : '') . fin
+  endif
+
+  " Fifth step:  actually start moving the cursor and call searchpair().
+  " Later, :execute restore_cursor to get to the original screen.
+  let restore_cursor = virtcol(".") . "|"
+  normal! g0
+  let restore_cursor = line(".") . "G" .  virtcol(".") . "|zs" . restore_cursor
+  normal! H
+  let restore_cursor = "normal!" . line(".") . "Gzt" . restore_cursor
+  execute restore_cursor
+  call cursor(0, curcol + 1)
+  " normal! 0
+  " if curcol
+  "   execute "normal!" . curcol . "l"
+  " endif
+  if skip =~ 'synID' && !(has("syntax") && exists("g:syntax_on"))
+    let skip = "0"
+  else
+    execute "if " . skip . "| let skip = '0' | endif"
+  endif
+  let sp_return = searchpair(ini, mid, fin, flag, skip)
+  let final_position = "call cursor(" . line(".") . "," . col(".") . ")"
+  " Restore cursor position and original screen.
+  execute restore_cursor
+  normal! m'
+  if sp_return > 0
+    execute final_position
+  endif
+  return s:CleanUp(restore_options, a:mode, startline, startcol, mid.'\|'.fin)
+endfun
+
+" Restore options and do some special handling for Operator-pending mode.
+" The optional argument is the tail of the matching group.
+fun! s:CleanUp(options, mode, startline, startcol, ...)
+  execute "set" a:options
+  " Open folds, if appropriate.
+  if a:mode != "o"
+    if &foldopen =~ "percent"
+      normal! zv
+    endif
+    " In Operator-pending mode, we want to include the whole match
+    " (for example, d%).
+    " This is only a problem if we end up moving in the forward direction.
+  elseif (a:startline < line(".")) ||
+        \ (a:startline == line(".") && a:startcol < col("."))
+    if a:0
+      " Check whether the match is a single character.  If not, move to the
+      " end of the match.
+      let matchline = getline(".")
+      let currcol = col(".")
+      let regexp = s:Wholematch(matchline, a:1, currcol-1)
+      let endcol = matchend(matchline, regexp)
+      if endcol > currcol  " This is NOT off by one!
+        execute "normal!" . (endcol - currcol) . "l"
+      endif
+    endif " a:0
+  endif " a:mode != "o" && etc.
+  return 0
+endfun
+
+" Example (simplified HTML patterns):  if
+"   a:groupBR   = '<\(\k\+\)>:</\1>'
+"   a:prefix    = '^.\{3}\('
+"   a:group     = '<\(\k\+\)>:</\(\k\+\)>'
+"   a:suffix    = '\).\{2}$'
+"   a:matchline =  "123<tag>12" or "123</tag>12"
+" then extract "tag" from a:matchline and return "<tag>:</tag>" .
+fun! s:InsertRefs(groupBR, prefix, group, suffix, matchline)
+  if a:matchline !~ a:prefix .
+    \ substitute(a:group, s:notslash . '\zs:', '\\|', 'g') . a:suffix
+    return a:group
+  endif
+  let i = matchend(a:groupBR, s:notslash . ':')
+  let ini = strpart(a:groupBR, 0, i-1)
+  let tailBR = strpart(a:groupBR, i)
+  let word = s:Choose(a:group, a:matchline, ":", "", a:prefix, a:suffix,
+    \ a:groupBR)
+  let i = matchend(word, s:notslash . ":")
+  let wordBR = strpart(word, i)
+  let word = strpart(word, 0, i-1)
+  " Now, a:matchline =~ a:prefix . word . a:suffix
+  if wordBR != ini
+    let table = s:Resolve(ini, wordBR, "table")
+  else
+    " let table = "----------"
+    let table = ""
+    let d = 0
+    while d < 10
+      if tailBR =~ s:notslash . '\\' . d
+        " let table[d] = d
+        let table = table . d
+      else
+        let table = table . "-"
+      endif
+      let d = d + 1
+    endwhile
+  endif
+  let d = 9
+  while d
+    if table[d] != "-"
+      let backref = substitute(a:matchline, a:prefix.word.a:suffix,
+        \ '\'.table[d], "")
+        " Are there any other characters that should be escaped?
+      let backref = escape(backref, '*,:')
+      execute s:Ref(ini, d, "start", "len")
+      let ini = strpart(ini, 0, start) . backref . strpart(ini, start+len)
+      let tailBR = substitute(tailBR, s:notslash . '\zs\\' . d,
+        \ escape(backref, '\\'), 'g')
+    endif
+    let d = d-1
+  endwhile
+  if exists("b:match_debug")
+    if s:do_BR
+      let b:match_table = table
+      let b:match_word = word
+    else
+      let b:match_table = ""
+      let b:match_word = ""
+    endif
+  endif
+  return ini . ":" . tailBR
+endfun
+
+" Input a comma-separated list of groups with backrefs, such as
+"   a:groups = '\(foo\):end\1,\(bar\):end\1'
+" and return a comma-separated list of groups with backrefs replaced:
+"   return '\(foo\):end\(foo\),\(bar\):end\(bar\)'
+fun! s:ParseWords(groups)
+  let groups = substitute(a:groups.",", s:notslash.'\zs[,:]*,[,:]*', ',', 'g')
+  let groups = substitute(groups, s:notslash . '\zs:\{2,}', ':', 'g')
+  let parsed = ""
+  while groups =~ '[^,:]'
+    let i = matchend(groups, s:notslash . ':')
+    let j = matchend(groups, s:notslash . ',')
+    let ini = strpart(groups, 0, i-1)
+    let tail = strpart(groups, i, j-i-1) . ":"
+    let groups = strpart(groups, j)
+    let parsed = parsed . ini
+    let i = matchend(tail, s:notslash . ':')
+    while i != -1
+      " In 'if:else:endif', ini='if' and word='else' and then word='endif'.
+      let word = strpart(tail, 0, i-1)
+      let tail = strpart(tail, i)
+      let i = matchend(tail, s:notslash . ':')
+      let parsed = parsed . ":" . s:Resolve(ini, word, "word")
+    endwhile " Now, tail has been used up.
+    let parsed = parsed . ","
+  endwhile " groups =~ '[^,:]'
+  let parsed = substitute(parsed, ',$', '', '')
+  return parsed
+endfun
+
+" TODO I think this can be simplified and/or made more efficient.
+" TODO What should I do if a:start is out of range?
+" Return a regexp that matches all of a:string, such that
+" matchstr(a:string, regexp) represents the match for a:pat that starts
+" as close to a:start as possible, before being preferred to after, and
+" ends after a:start .
+" Usage:
+" let regexp = s:Wholematch(getline("."), 'foo\|bar', col(".")-1)
+" let i      = match(getline("."), regexp)
+" let j      = matchend(getline("."), regexp)
+" let match  = matchstr(getline("."), regexp)
+fun! s:Wholematch(string, pat, start)
+  let group = '\%(' . a:pat . '\)'
+  let prefix = (a:start ? '\(^.*\%<' . (a:start + 2) . 'c\)\zs' : '^')
+  let len = strlen(a:string)
+  let suffix = (a:start+1 < len ? '\(\%>'.(a:start+1).'c.*$\)\@=' : '$')
+  if a:string !~ prefix . group . suffix
+    let prefix = ''
+  endif
+  return prefix . group . suffix
+endfun
+
+" No extra arguments:  s:Ref(string, d) will
+" find the d'th occurrence of '\(' and return it, along with everything up
+" to and including the matching '\)'.
+" One argument:  s:Ref(string, d, "start") returns the index of the start
+" of the d'th '\(' and any other argument returns the length of the group.
+" Two arguments:  s:Ref(string, d, "foo", "bar") returns a string to be
+" executed, having the effect of
+"   :let foo = s:Ref(string, d, "start")
+"   :let bar = s:Ref(string, d, "len")
+fun! s:Ref(string, d, ...)
+  let len = strlen(a:string)
+  if a:d == 0
+    let start = 0
+  else
+    let cnt = a:d
+    let match = a:string
+    while cnt
+      let cnt = cnt - 1
+      let index = matchend(match, s:notslash . '\\(')
+      if index == -1
+        return ""
+      endif
+      let match = strpart(match, index)
+    endwhile
+    let start = len - strlen(match)
+    if a:0 == 1 && a:1 == "start"
+      return start - 2
+    endif
+    let cnt = 1
+    while cnt
+      let index = matchend(match, s:notslash . '\\(\|\\)') - 1
+      if index == -2
+        return ""
+      endif
+      " Increment if an open, decrement if a ')':
+      let cnt = cnt + (match[index]=="(" ? 1 : -1)  " ')'
+      " let cnt = stridx('0(', match[index]) + cnt
+      let match = strpart(match, index+1)
+    endwhile
+    let start = start - 2
+    let len = len - start - strlen(match)
+  endif
+  if a:0 == 1
+    return len
+  elseif a:0 == 2
+    return "let " . a:1 . "=" . start . "| let " . a:2 . "=" . len
+  else
+    return strpart(a:string, start, len)
+  endif
+endfun
+
+" Count the number of disjoint copies of pattern in string.
+" If the pattern is a literal string and contains no '0' or '1' characters
+" then s:Count(string, pattern, '0', '1') should be faster than
+" s:Count(string, pattern).
+fun! s:Count(string, pattern, ...)
+  let pat = escape(a:pattern, '\\')
+  if a:0 > 1
+    let foo = substitute(a:string, '[^'.a:pattern.']', "a:1", "g")
+    let foo = substitute(a:string, pat, a:2, "g")
+    let foo = substitute(foo, '[^' . a:2 . ']', "", "g")
+    return strlen(foo)
+  endif
+  let result = 0
+  let foo = a:string
+  let index = matchend(foo, pat)
+  while index != -1
+    let result = result + 1
+    let foo = strpart(foo, index)
+    let index = matchend(foo, pat)
+  endwhile
+  return result
+endfun
+
+" s:Resolve('\(a\)\(b\)', '\(c\)\2\1\1\2') should return table.word, where
+" word = '\(c\)\(b\)\(a\)\3\2' and table = '-32-------'.  That is, the first
+" '\1' in target is replaced by '\(a\)' in word, table[1] = 3, and this
+" indicates that all other instances of '\1' in target are to be replaced
+" by '\3'.  The hard part is dealing with nesting...
+" Note that ":" is an illegal character for source and target,
+" unless it is preceded by "\".
+fun! s:Resolve(source, target, output)
+  let word = a:target
+  let i = matchend(word, s:notslash . '\\\d') - 1
+  let table = "----------"
+  while i != -2 " There are back references to be replaced.
+    let d = word[i]
+    let backref = s:Ref(a:source, d)
+    " The idea is to replace '\d' with backref.  Before we do this,
+    " replace any \(\) groups in backref with :1, :2, ... if they
+    " correspond to the first, second, ... group already inserted
+    " into backref.  Later, replace :1 with \1 and so on.  The group
+    " number w+b within backref corresponds to the group number
+    " s within a:source.
+    " w = number of '\(' in word before the current one
+    let w = s:Count(
+    \ substitute(strpart(word, 0, i-1), '\\\\', '', 'g'), '\(', '1')
+    let b = 1 " number of the current '\(' in backref
+    let s = d " number of the current '\(' in a:source
+    while b <= s:Count(substitute(backref, '\\\\', '', 'g'), '\(', '1')
+    \ && s < 10
+      if table[s] == "-"
+        if w + b < 10
+          " let table[s] = w + b
+          let table = strpart(table, 0, s) . (w+b) . strpart(table, s+1)
+        endif
+        let b = b + 1
+        let s = s + 1
+      else
+        execute s:Ref(backref, b, "start", "len")
+        let ref = strpart(backref, start, len)
+        let backref = strpart(backref, 0, start) . ":". table[s]
+        \ . strpart(backref, start+len)
+        let s = s + s:Count(substitute(ref, '\\\\', '', 'g'), '\(', '1')
+      endif
+    endwhile
+    let word = strpart(word, 0, i-1) . backref . strpart(word, i+1)
+    let i = matchend(word, s:notslash . '\\\d') - 1
+  endwhile
+  let word = substitute(word, s:notslash . '\zs:', '\\', 'g')
+  if a:output == "table"
+    return table
+  elseif a:output == "word"
+    return word
+  else
+    return table . word
+  endif
+endfun
+
+" Assume a:comma = ",".  Then the format for a:patterns and a:1 is
+"   a:patterns = "<pat1>,<pat2>,..."
+"   a:1 = "<alt1>,<alt2>,..."
+" If <patn> is the first pattern that matches a:string then return <patn>
+" if no optional arguments are given; return <patn>,<altn> if a:1 is given.
+fun! s:Choose(patterns, string, comma, branch, prefix, suffix, ...)
+  let tail = (a:patterns =~ a:comma."$" ? a:patterns : a:patterns . a:comma)
+  let i = matchend(tail, s:notslash . a:comma)
+  if a:0
+    let alttail = (a:1 =~ a:comma."$" ? a:1 : a:1 . a:comma)
+    let j = matchend(alttail, s:notslash . a:comma)
+  endif
+  let current = strpart(tail, 0, i-1)
+  if a:branch == ""
+    let currpat = current
+  else
+    let currpat = substitute(current, s:notslash . a:branch, '\\|', 'g')
+  endif
+  while a:string !~ a:prefix . currpat . a:suffix
+    let tail = strpart(tail, i)
+    let i = matchend(tail, s:notslash . a:comma)
+    if i == -1
+      return -1
+    endif
+    let current = strpart(tail, 0, i-1)
+    if a:branch == ""
+      let currpat = current
+    else
+      let currpat = substitute(current, s:notslash . a:branch, '\\|', 'g')
+    endif
+    if a:0
+      let alttail = strpart(alttail, j)
+      let j = matchend(alttail, s:notslash . a:comma)
+    endif
+  endwhile
+  if a:0
+    let current = current . a:comma . strpart(alttail, 0, j-1)
+  endif
+  return current
+endfun
+
+" Call this function to turn on debugging information.  Every time the main
+" script is run, buffer variables will be saved.  These can be used directly
+" or viewed using the menu items below.
+if !exists(":MatchDebug")
+  command! -nargs=0 MatchDebug call s:Match_debug()
+endif
+
+fun! s:Match_debug()
+  let b:match_debug = 1 " Save debugging information.
+  " pat = all of b:match_words with backrefs parsed
+  amenu &Matchit.&pat   :echo b:match_pat<CR>
+  " match = bit of text that is recognized as a match
+  amenu &Matchit.&match :echo b:match_match<CR>
+  " curcol = cursor column of the start of the matching text
+  amenu &Matchit.&curcol        :echo b:match_col<CR>
+  " wholeBR = matching group, original version
+  amenu &Matchit.wh&oleBR       :echo b:match_wholeBR<CR>
+  " iniBR = 'if' piece, original version
+  amenu &Matchit.ini&BR :echo b:match_iniBR<CR>
+  " ini = 'if' piece, with all backrefs resolved from match
+  amenu &Matchit.&ini   :echo b:match_ini<CR>
+  " tail = 'else\|endif' piece, with all backrefs resolved from match
+  amenu &Matchit.&tail  :echo b:match_tail<CR>
+  " fin = 'endif' piece, with all backrefs resolved from match
+  amenu &Matchit.&word  :echo b:match_word<CR>
+  " '\'.d in ini refers to the same thing as '\'.table[d] in word.
+  amenu &Matchit.t&able :echo '0:' . b:match_table . ':9'<CR>
+endfun
+
+" Jump to the nearest unmatched "(" or "if" or "<tag>" if a:spflag == "bW"
+" or the nearest unmatched "</tag>" or "endif" or ")" if a:spflag == "W".
+" Return a "mark" for the original position, so that
+"   let m = MultiMatch("bW", "n") ... execute m
+" will return to the original position.  If there is a problem, do not
+" move the cursor and return "", unless a count is given, in which case
+" go up or down as many levels as possible and again return "".
+" TODO This relies on the same patterns as % matching.  It might be a good
+" idea to give it its own matching patterns.
+fun! s:MultiMatch(spflag, mode)
+  if !exists("b:match_words") || b:match_words == ""
+    return ""
+  end
+  let restore_options = (&ic ? "" : "no") . "ignorecase"
+  if exists("b:match_ignorecase")
+    let &ignorecase = b:match_ignorecase
+  endif
+  let startline = line(".")
+  let startcol = col(".")
+
+  " First step:  if not already done, set the script variables
+  "   s:do_BR   flag for whether there are backrefs
+  "   s:pat     parsed version of b:match_words
+  "   s:all     regexp based on s:pat and the default groups
+  " This part is copied and slightly modified from s:Match_wrapper().
+  let default = escape(&mps, '[$^.*~\\/?]') . (strlen(&mps) ? "," : "") .
+    \ '\/\*:\*\/,#if\%(def\)\=:#else\>:#elif\>:#endif\>'
+  " Allow b:match_words = "GetVimMatchWords()" .
+  if b:match_words =~ ":"
+    let match_words = b:match_words
+  else
+    execute "let match_words =" b:match_words
+  endif
+  if (match_words != s:last_words) || (&mps != s:last_mps) ||
+    \ exists("b:match_debug")
+    let s:last_words = match_words
+    let s:last_mps = &mps
+    if match_words !~ s:notslash . '\\\d'
+      let s:do_BR = 0
+      let s:pat = match_words
+    else
+      let s:do_BR = 1
+      let s:pat = s:ParseWords(match_words)
+    endif
+    let s:all = '\%(' . substitute(s:pat . (strlen(s:pat)?",":"") . default,
+      \ '[,:]\+','\\|','g') . '\)'
+    if exists("b:match_debug")
+      let b:match_pat = s:pat
+    endif
+  endif
+
+  " Second step:  figure out the patterns for searchpair()
+  " and save the screen, cursor position, and 'ignorecase'.
+  " - TODO:  A lot of this is copied from s:Match_wrapper().
+  " - maybe even more functionality should be split off
+  " - into separate functions!
+  let cdefault = (s:pat =~ '[^,]$' ? "," : "") . default
+  let open =  substitute(s:pat . cdefault,
+        \ s:notslash . '\zs:.\{-}' . s:notslash . ',', '\\),\\(', 'g')
+  let open =  '\(' . substitute(open, s:notslash . '\zs:.*$', '\\)', '')
+  let close = substitute(s:pat . cdefault,
+        \ s:notslash . '\zs,.\{-}' . s:notslash . ':', '\\),\\(', 'g')
+  let close = substitute(close, '^.\{-}' . s:notslash . ':', '\\(', '') . '\)'
+  if exists("b:match_skip")
+    let skip = b:match_skip
+  elseif exists("b:match_comment") " backwards compatibility and testing!
+    let skip = "r:" . b:match_comment
+  else
+    let skip = 's:comment\|string'
+  endif
+  let skip = s:ParseSkip(skip)
+  " let restore_cursor = line(".") . "G" . virtcol(".") . "|"
+  " normal! H
+  " let restore_cursor = "normal!" . line(".") . "Gzt" . restore_cursor
+  let restore_cursor = virtcol(".") . "|"
+  normal! g0
+  let restore_cursor = line(".") . "G" .  virtcol(".") . "|zs" . restore_cursor
+  normal! H
+  let restore_cursor = "normal!" . line(".") . "Gzt" . restore_cursor
+  execute restore_cursor
+
+  " Third step: call searchpair().
+  " Replace '\('--but not '\\('--with '\%(' and ',' with '\|'.
+  let openpat =  substitute(open, '\(\\\@<!\(\\\\\)*\)\@<=\\(', '\\%(', 'g')
+  let openpat = substitute(openpat, ',', '\\|', 'g')
+  let closepat = substitute(close, '\(\\\@<!\(\\\\\)*\)\@<=\\(', '\\%(', 'g')
+  let closepat = substitute(closepat, ',', '\\|', 'g')
+  if skip =~ 'synID' && !(has("syntax") && exists("g:syntax_on"))
+    let skip = '0'
+  else
+    execute "if " . skip . "| let skip = '0' | endif"
+  endif
+  mark '
+  let level = v:count1
+  while level
+    if searchpair(openpat, '', closepat, a:spflag, skip) < 1
+      call s:CleanUp(restore_options, a:mode, startline, startcol)
+      return ""
+    endif
+    let level = level - 1
+  endwhile
+
+  " Restore options and return a string to restore the original position.
+  call s:CleanUp(restore_options, a:mode, startline, startcol)
+  return restore_cursor
+endfun
+
+" Search backwards for "if" or "while" or "<tag>" or ...
+" and return "endif" or "endwhile" or "</tag>" or ... .
+" For now, this uses b:match_words and the same script variables
+" as s:Match_wrapper() .  Later, it may get its own patterns,
+" either from a buffer variable or passed as arguments.
+" fun! s:Autocomplete()
+"   echo "autocomplete not yet implemented :-("
+"   if !exists("b:match_words") || b:match_words == ""
+"     return ""
+"   end
+"   let startpos = s:MultiMatch("bW")
+"
+"   if startpos == ""
+"     return ""
+"   endif
+"   " - TODO:  figure out whether 'if' or '<tag>' matched, and construct
+"   " - the appropriate closing.
+"   let matchline = getline(".")
+"   let curcol = col(".") - 1
+"   " - TODO:  Change the s:all argument if there is a new set of match pats.
+"   let regexp = s:Wholematch(matchline, s:all, curcol)
+"   let suf = strlen(matchline) - matchend(matchline, regexp)
+"   let prefix = (curcol ? '^.\{'  . curcol . '}\%(' : '^\%(')
+"   let suffix = (suf ? '\).\{' . suf . '}$'  : '\)$')
+"   " Reconstruct the version with unresolved backrefs.
+"   let patBR = substitute(b:match_words.',', '[,:]*,[,:]*', ',', 'g')
+"   let patBR = substitute(patBR, ':\{2,}', ':', "g")
+"   " Now, set group and groupBR to the matching group: 'if:endif' or
+"   " 'while:endwhile' or whatever.
+"   let group = s:Choose(s:pat, matchline, ",", ":", prefix, suffix, patBR)
+"   let i = matchend(group, s:notslash . ",")
+"   let groupBR = strpart(group, i)
+"   let group = strpart(group, 0, i-1)
+"   " Now, matchline =~ prefix . substitute(group,':','\|','g') . suffix
+"   if s:do_BR
+"     let group = s:InsertRefs(groupBR, prefix, group, suffix, matchline)
+"   endif
+" " let g:group = group
+"
+"   " - TODO:  Construct the closing from group.
+"   let fake = "end" . expand("<cword>")
+"   execute startpos
+"   return fake
+" endfun
+
+" Close all open structures.  "Get the heck out of here!"
+" fun! s:Gthhoh()
+"   let close = s:Autocomplete()
+"   while strlen(close)
+"     put=close
+"     let close = s:Autocomplete()
+"   endwhile
+" endfun
+
+" Parse special strings as typical skip arguments for searchpair():
+"   s:foo becomes (current syntax item) =~ foo
+"   S:foo becomes (current syntax item) !~ foo
+"   r:foo becomes (line before cursor) =~ foo
+"   R:foo becomes (line before cursor) !~ foo
+fun! s:ParseSkip(str)
+  let skip = a:str
+  if skip[1] == ":"
+    if skip[0] == "s"
+      let skip = "synIDattr(synID(line('.'),col('.'),1),'name') =~? '" .
+        \ strpart(skip,2) . "'"
+    elseif skip[0] == "S"
+      let skip = "synIDattr(synID(line('.'),col('.'),1),'name') !~? '" .
+        \ strpart(skip,2) . "'"
+    elseif skip[0] == "r"
+      let skip = "strpart(getline('.'),0,col('.'))=~'" . strpart(skip,2). "'"
+    elseif skip[0] == "R"
+      let skip = "strpart(getline('.'),0,col('.'))!~'" . strpart(skip,2). "'"
+    endif
+  endif
+  return skip
+endfun
+
+let &cpo = s:save_cpo
+
+" vim:sts=2:sw=2: