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ccomplete.vim
" Vim completion script " Language: C " Maintainer: Bram Moolenaar <Bram@vim.org> " Last Change: 2012 Jun 20 let s:cpo_save = &cpo set cpo&vim " This function is used for the 'omnifunc' option. function! ccomplete#Complete(findstart, base) if a:findstart " Locate the start of the item, including ".", "->" and "[...]". let line = getline('.') let start = col('.') - 1 let lastword = -1 while start > 0 if line[start - 1] =~ '\w' let start -= 1 elseif line[start - 1] =~ '\.' if lastword == -1 let lastword = start endif let start -= 1 elseif start > 1 && line[start - 2] == '-' && line[start - 1] == '>' if lastword == -1 let lastword = start endif let start -= 2 elseif line[start - 1] == ']' " Skip over [...]. let n = 0 let start -= 1 while start > 0 let start -= 1 if line[start] == '[' if n == 0 break endif let n -= 1 elseif line[start] == ']' " nested [] let n += 1 endif endwhile else break endif endwhile " Return the column of the last word, which is going to be changed. " Remember the text that comes before it in s:prepended. if lastword == -1 let s:prepended = '' return start endif let s:prepended = strpart(line, start, lastword - start) return lastword endif " Return list of matches. let base = s:prepended . a:base " Don't do anything for an empty base, would result in all the tags in the " tags file. if base == '' return [] endif " init cache for vimgrep to empty let s:grepCache = {} " Split item in words, keep empty word after "." or "->". " "aa" -> ['aa'], "aa." -> ['aa', ''], "aa.bb" -> ['aa', 'bb'], etc. " We can't use split, because we need to skip nested [...]. let items = [] let s = 0 while 1 let e = match(base, '\.\|->\|\[', s) if e < 0 if s == 0 || base[s - 1] != ']' call add(items, strpart(base, s)) endif break endif if s == 0 || base[s - 1] != ']' call add(items, strpart(base, s, e - s)) endif if base[e] == '.' let s = e + 1 " skip over '.' elseif base[e] == '-' let s = e + 2 " skip over '->' else " Skip over [...]. let n = 0 let s = e let e += 1 while e < len(base) if base[e] == ']' if n == 0 break endif let n -= 1 elseif base[e] == '[' " nested [...] let n += 1 endif let e += 1 endwhile let e += 1 call add(items, strpart(base, s, e - s)) let s = e endif endwhile " Find the variable items[0]. " 1. in current function (like with "gd") " 2. in tags file(s) (like with ":tag") " 3. in current file (like with "gD") let res = [] if searchdecl(items[0], 0, 1) == 0 " Found, now figure out the type. " TODO: join previous line if it makes sense let line = getline('.') let col = col('.') if stridx(strpart(line, 0, col), ';') != -1 " Handle multiple declarations on the same line. let col2 = col - 1 while line[col2] != ';' let col2 -= 1 endwhile let line = strpart(line, col2 + 1) let col -= col2 endif if stridx(strpart(line, 0, col), ',') != -1 " Handle multiple declarations on the same line in a function " declaration. let col2 = col - 1 while line[col2] != ',' let col2 -= 1 endwhile if strpart(line, col2 + 1, col - col2 - 1) =~ ' *[^ ][^ ]* *[^ ]' let line = strpart(line, col2 + 1) let col -= col2 endif endif if len(items) == 1 " Completing one word and it's a local variable: May add '[', '.' or " '->'. let match = items[0] let kind = 'v' if match(line, '\<' . match . '\s*\[') > 0 let match .= '[' else let res = s:Nextitem(strpart(line, 0, col), [''], 0, 1) if len(res) > 0 " There are members, thus add "." or "->". if match(line, '\*[ \t(]*' . match . '\>') > 0 let match .= '->' else let match .= '.' endif endif endif let res = [{'match': match, 'tagline' : '', 'kind' : kind, 'info' : line}] else " Completing "var.", "var.something", etc. let res = s:Nextitem(strpart(line, 0, col), items[1:], 0, 1) endif endif if len(items) == 1 " Only one part, no "." or "->": complete from tags file. let tags = taglist('^' . base) " Remove members, these can't appear without something in front. call filter(tags, 'has_key(v:val, "kind") ? v:val["kind"] != "m" : 1') " Remove static matches in other files. call filter(tags, '!has_key(v:val, "static") || !v:val["static"] || bufnr("%") == bufnr(v:val["filename"])') call extend(res, map(tags, 's:Tag2item(v:val)')) endif if len(res) == 0 " Find the variable in the tags file(s) let diclist = taglist('^' . items[0] . '$') " Remove members, these can't appear without something in front. call filter(diclist, 'has_key(v:val, "kind") ? v:val["kind"] != "m" : 1') let res = [] for i in range(len(diclist)) " New ctags has the "typeref" field. Patched version has "typename". if has_key(diclist[i], 'typename') call extend(res, s:StructMembers(diclist[i]['typename'], items[1:], 1)) elseif has_key(diclist[i], 'typeref') call extend(res, s:StructMembers(diclist[i]['typeref'], items[1:], 1)) endif " For a variable use the command, which must be a search pattern that " shows the declaration of the variable. if diclist[i]['kind'] == 'v' let line = diclist[i]['cmd'] if line[0] == '/' && line[1] == '^' let col = match(line, '\<' . items[0] . '\>') call extend(res, s:Nextitem(strpart(line, 2, col - 2), items[1:], 0, 1)) endif endif endfor endif if len(res) == 0 && searchdecl(items[0], 1) == 0 " Found, now figure out the type. " TODO: join previous line if it makes sense let line = getline('.') let col = col('.') let res = s:Nextitem(strpart(line, 0, col), items[1:], 0, 1) endif " If the last item(s) are [...] they need to be added to the matches. let last = len(items) - 1 let brackets = '' while last >= 0 if items[last][0] != '[' break endif let brackets = items[last] . brackets let last -= 1 endwhile return map(res, 's:Tagline2item(v:val, brackets)') endfunc function! s:GetAddition(line, match, memarg, bracket) " Guess if the item is an array. if a:bracket && match(a:line, a:match . '\s*\[') > 0 return '[' endif " Check if the item has members. if len(s:SearchMembers(a:memarg, [''], 0)) > 0 " If there is a '*' before the name use "->". if match(a:line, '\*[ \t(]*' . a:match . '\>') > 0 return '->' else return '.' endif endif return '' endfunction " Turn the tag info "val" into an item for completion. " "val" is is an item in the list returned by taglist(). " If it is a variable we may add "." or "->". Don't do it for other types, " such as a typedef, by not including the info that s:GetAddition() uses. function! s:Tag2item(val) let res = {'match': a:val['name']} let res['extra'] = s:Tagcmd2extra(a:val['cmd'], a:val['name'], a:val['filename']) let s = s:Dict2info(a:val) if s != '' let res['info'] = s endif let res['tagline'] = '' if has_key(a:val, "kind") let kind = a:val['kind'] let res['kind'] = kind if kind == 'v' let res['tagline'] = "\t" . a:val['cmd'] let res['dict'] = a:val elseif kind == 'f' let res['match'] = a:val['name'] . '(' endif endif return res endfunction " Use all the items in dictionary for the "info" entry. function! s:Dict2info(dict) let info = '' for k in sort(keys(a:dict)) let info .= k . repeat(' ', 10 - len(k)) if k == 'cmd' let info .= substitute(matchstr(a:dict['cmd'], '/^\s*\zs.*\ze$/'), '\\\(.\)', '\1', 'g') else let info .= a:dict[k] endif let info .= "\n" endfor return info endfunc " Parse a tag line and return a dictionary with items like taglist() function! s:ParseTagline(line) let l = split(a:line, "\t") let d = {} if len(l) >= 3 let d['name'] = l[0] let d['filename'] = l[1] let d['cmd'] = l[2] let n = 2 if l[2] =~ '^/' " Find end of cmd, it may contain Tabs. while n < len(l) && l[n] !~ '/;"$' let n += 1 let d['cmd'] .= " " . l[n] endwhile endif for i in range(n + 1, len(l) - 1) if l[i] == 'file:' let d['static'] = 1 elseif l[i] !~ ':' let d['kind'] = l[i] else let d[matchstr(l[i], '[^:]*')] = matchstr(l[i], ':\zs.*') endif endfor endif return d endfunction " Turn a match item "val" into an item for completion. " "val['match']" is the matching item. " "val['tagline']" is the tagline in which the last part was found. function! s:Tagline2item(val, brackets) let line = a:val['tagline'] let add = s:GetAddition(line, a:val['match'], [a:val], a:brackets == '') let res = {'word': a:val['match'] . a:brackets . add } if has_key(a:val, 'info') " Use info from Tag2item(). let res['info'] = a:val['info'] else " Parse the tag line and add each part to the "info" entry. let s = s:Dict2info(s:ParseTagline(line)) if s != '' let res['info'] = s endif endif if has_key(a:val, 'kind') let res['kind'] = a:val['kind'] elseif add == '(' let res['kind'] = 'f' else let s = matchstr(line, '\t\(kind:\)\=\zs\S\ze\(\t\|$\)') if s != '' let res['kind'] = s endif endif if has_key(a:val, 'extra') let res['menu'] = a:val['extra'] return res endif " Isolate the command after the tag and filename. let s = matchstr(line, '[^\t]*\t[^\t]*\t\zs\(/^.*$/\|[^\t]*\)\ze\(;"\t\|\t\|$\)') if s != '' let res['menu'] = s:Tagcmd2extra(s, a:val['match'], matchstr(line, '[^\t]*\t\zs[^\t]*\ze\t')) endif return res endfunction " Turn a command from a tag line to something that is useful in the menu function! s:Tagcmd2extra(cmd, name, fname) if a:cmd =~ '^/^' " The command is a search command, useful to see what it is. let x = matchstr(a:cmd, '^/^\s*\zs.*\ze$/') let x = substitute(x, '\<' . a:name . '\>', '@@', '') let x = substitute(x, '\\\(.\)', '\1', 'g') let x = x . ' - ' . a:fname elseif a:cmd =~ '^\d*$' " The command is a line number, the file name is more useful. let x = a:fname . ' - ' . a:cmd else " Not recognized, use command and file name. let x = a:cmd . ' - ' . a:fname endif return x endfunction " Find composing type in "lead" and match items[0] with it. " Repeat this recursively for items[1], if it's there. " When resolving typedefs "depth" is used to avoid infinite recursion. " Return the list of matches. function! s:Nextitem(lead, items, depth, all) " Use the text up to the variable name and split it in tokens. let tokens = split(a:lead, '\s\+\|\<') " Try to recognize the type of the variable. This is rough guessing... let res = [] for tidx in range(len(tokens)) " Skip tokens starting with a non-ID character. if tokens[tidx] !~ '^\h' continue endif " Recognize "struct foobar" and "union foobar". " Also do "class foobar" when it's C++ after all (doesn't work very well " though). if (tokens[tidx] == 'struct' || tokens[tidx] == 'union' || tokens[tidx] == 'class') && tidx + 1 < len(tokens) let res = s:StructMembers(tokens[tidx] . ':' . tokens[tidx + 1], a:items, a:all) break endif " TODO: add more reserved words if index(['int', 'short', 'char', 'float', 'double', 'static', 'unsigned', 'extern'], tokens[tidx]) >= 0 continue endif " Use the tags file to find out if this is a typedef. let diclist = taglist('^' . tokens[tidx] . '$') for tagidx in range(len(diclist)) let item = diclist[tagidx] " New ctags has the "typeref" field. Patched version has "typename". if has_key(item, 'typeref') call extend(res, s:StructMembers(item['typeref'], a:items, a:all)) continue endif if has_key(item, 'typename') call extend(res, s:StructMembers(item['typename'], a:items, a:all)) continue endif " Only handle typedefs here. if item['kind'] != 't' continue endif " Skip matches local to another file. if has_key(item, 'static') && item['static'] && bufnr('%') != bufnr(item['filename']) continue endif " For old ctags we recognize "typedef struct aaa" and " "typedef union bbb" in the tags file command. let cmd = item['cmd'] let ei = matchend(cmd, 'typedef\s\+') if ei > 1 let cmdtokens = split(strpart(cmd, ei), '\s\+\|\<') if len(cmdtokens) > 1 if cmdtokens[0] == 'struct' || cmdtokens[0] == 'union' || cmdtokens[0] == 'class' let name = '' " Use the first identifier after the "struct" or "union" for ti in range(len(cmdtokens) - 1) if cmdtokens[ti] =~ '^\w' let name = cmdtokens[ti] break endif endfor if name != '' call extend(res, s:StructMembers(cmdtokens[0] . ':' . name, a:items, a:all)) endif elseif a:depth < 10 " Could be "typedef other_T some_T". call extend(res, s:Nextitem(cmdtokens[0], a:items, a:depth + 1, a:all)) endif endif endif endfor if len(res) > 0 break endif endfor return res endfunction " Search for members of structure "typename" in tags files. " Return a list with resulting matches. " Each match is a dictionary with "match" and "tagline" entries. " When "all" is non-zero find all, otherwise just return 1 if there is any " member. function! s:StructMembers(typename, items, all) " Todo: What about local structures? let fnames = join(map(tagfiles(), 'escape(v:val, " \\#%")')) if fnames == '' return [] endif let typename = a:typename let qflist = [] let cached = 0 if a:all == 0 let n = '1' " stop at first found match if has_key(s:grepCache, a:typename) let qflist = s:grepCache[a:typename] let cached = 1 endif else let n = '' endif if !cached while 1 exe 'silent! keepj noautocmd ' . n . 'vimgrep /\t' . typename . '\(\t\|$\)/j ' . fnames let qflist = getqflist() if len(qflist) > 0 || match(typename, "::") < 0 break endif " No match for "struct:context::name", remove "context::" and try again. let typename = substitute(typename, ':[^:]*::', ':', '') endwhile if a:all == 0 " Store the result to be able to use it again later. let s:grepCache[a:typename] = qflist endif endif " Put matching members in matches[]. let matches = [] for l in qflist let memb = matchstr(l['text'], '[^\t]*') if memb =~ '^' . a:items[0] " Skip matches local to another file. if match(l['text'], "\tfile:") < 0 || bufnr('%') == bufnr(matchstr(l['text'], '\t\zs[^\t]*')) let item = {'match': memb, 'tagline': l['text']} " Add the kind of item. let s = matchstr(l['text'], '\t\(kind:\)\=\zs\S\ze\(\t\|$\)') if s != '' let item['kind'] = s if s == 'f' let item['match'] = memb . '(' endif endif call add(matches, item) endif endif endfor if len(matches) > 0 " Skip over [...] items let idx = 1 while 1 if idx >= len(a:items) return matches " No further items, return the result. endif if a:items[idx][0] != '[' break endif let idx += 1 endwhile " More items following. For each of the possible members find the " matching following members. return s:SearchMembers(matches, a:items[idx :], a:all) endif " Failed to find anything. return [] endfunction " For matching members, find matches for following items. " When "all" is non-zero find all, otherwise just return 1 if there is any " member. function! s:SearchMembers(matches, items, all) let res = [] for i in range(len(a:matches)) let typename = '' if has_key(a:matches[i], 'dict') if has_key(a:matches[i].dict, 'typename') let typename = a:matches[i].dict['typename'] elseif has_key(a:matches[i].dict, 'typeref') let typename = a:matches[i].dict['typeref'] endif let line = "\t" . a:matches[i].dict['cmd'] else let line = a:matches[i]['tagline'] let e = matchend(line, '\ttypename:') if e < 0 let e = matchend(line, '\ttyperef:') endif if e > 0 " Use typename field let typename = matchstr(line, '[^\t]*', e) endif endif if typename != '' call extend(res, s:StructMembers(typename, a:items, a:all)) else " Use the search command (the declaration itself). let s = match(line, '\t\zs/^') if s > 0 let e = match(line, '\<' . a:matches[i]['match'] . '\>', s) if e > 0 call extend(res, s:Nextitem(strpart(line, s, e - s), a:items, 0, a:all)) endif endif endif if a:all == 0 && len(res) > 0 break endif endfor return res endfunc let &cpo = s:cpo_save unlet s:cpo_save
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