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" Vim completion script
" Language: C
" Maintainer: Bram Moolenaar <Bram@vim.org>
" Last Change: 2005 Sep 13
" 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
while start > 0
if line[start - 1] =~ '\w\|\.'
let start -= 1
elseif start > 1 && line[start - 2] == '-' && line[start - 1] == '>'
let start -= 2
else
break
endif
endwhile
return start
endif
" Return list of matches.
" Split item in words, keep empty word after "." or "->".
" "aa" -> ['aa'], "aa." -> ['aa', ''], "aa.bb" -> ['aa', 'bb'], etc.
let items = split(a:base, '\.\|->', 1)
if len(items) <= 1
" Only one part, no "." or "->": complete from tags file.
" When local completion is wanted CTRL-N would have been used.
return map(taglist('^' . a:base), 'v:val["name"]')
endif
" 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('.')
let res = s:Nextitem(strpart(line, 0, col), items[1:])
endif
if len(res) == 0
" Find the variable in the tags file(s)
let diclist = taglist('^' . items[0] . '$')
let res = []
for i in range(len(diclist))
" New ctags has the "typename" field.
if has_key(diclist[i], 'typename')
call extend(res, s:StructMembers(diclist[i]['typename'], items[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:]))
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:])
endif
" If the one and only match was what's already there and it is a composite
" type, add a "." or "->".
if len(res) == 1 && res[0]['match'] == items[-1] && len(s:SearchMembers(res, [''])) > 0
" If there is a '*' before the name use "->".
if match(res[0]['tagline'], '\*\s*' . res[0]['match']) > 0
let res[0]['match'] .= '->'
else
let res[0]['match'] .= '.'
endif
endif
" The basetext is up to the last "." or "->" and won't be changed. The
" matching members are concatenated to this.
let basetext = matchstr(a:base, '.*\(\.\|->\)')
return map(res, 'basetext . v:val["match"]')
endfunc
" Find composing type in "lead" and match items[0] with it.
" Repeat this recursively for items[1], if it's there.
" Return the list of matches.
function! s:Nextitem(lead, items)
" 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))
" Recognize "struct foobar" and "union foobar".
if (tokens[tidx] == 'struct' || tokens[tidx] == 'union') && tidx + 1 < len(tokens)
let res = s:StructMembers(tokens[tidx] . ':' . tokens[tidx + 1], a:items)
break
endif
" TODO: add more reserved words
if index(['int', 'float', '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))
" New ctags has the "typename" field.
if has_key(diclist[tagidx], 'typename')
call extend(res, s:StructMembers(diclist[tagidx]['typename'], a:items))
continue
endif
" Only handle typedefs here.
if diclist[tagidx]['kind'] != 't'
continue
endif
" For old ctags we recognize "typedef struct aaa" and
" "typedef union bbb" in the tags file command.
let cmd = diclist[tagidx]['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'
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))
endif
else
" Could be "typedef other_T some_T".
call extend(res, s:Nextitem(cmdtokens[0], a:items))
endif
endif
endif
endfor
if len(res) > 0
break
endif
endfor
return res
endfunction
" Return a list with resulting matches.
" Each match is a dictionary with "match" and "tagline" entries.
function! s:StructMembers(typename, items)
" Todo: What about local structures?
let fnames = join(map(tagfiles(), 'escape(v:val, " \\")'))
if fnames == ''
return []
endif
let typename = a:typename
let qflist = []
while 1
exe 'silent! 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
let matches = []
for l in qflist
let memb = matchstr(l['text'], '[^\t]*')
if memb =~ '^' . a:items[0]
call add(matches, {'match': memb, 'tagline': l['text']})
endif
endfor
if len(matches) > 0
" No further items, return the result.
if len(a:items) == 1
return matches
endif
" More items following. For each of the possible members find the
" matching following members.
return s:SearchMembers(matches, a:items[1:])
endif
" Failed to find anything.
return []
endfunction
" For matching members, find matches for following items.
function! s:SearchMembers(matches, items)
let res = []
for i in range(len(a:matches))
let line = a:matches[i]['tagline']
let e = matchend(line, '\ttypename:')
if e > 0
" Use typename field
let name = matchstr(line, '[^\t]*', e)
call extend(res, s:StructMembers(name, a:items))
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))
endif
endif
endif
endfor
return res
endfunc
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