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" Vim indent file
" Language: cobol
" Author: Tim Pope <vimNOSPAM@tpope.info>
" $Id: cobol.vim,v 1.1 2007/05/05 18:08:19 vimboss Exp $
if exists("b:did_indent")
finish
endif
let b:did_indent = 1
setlocal expandtab
setlocal indentexpr=GetCobolIndent(v:lnum)
setlocal indentkeys&
setlocal indentkeys+=0<*>,0/,0$,0=01,=~division,=~section,0=~end,0=~then,0=~else,0=~when,*<Return>,.
" Only define the function once.
if exists("*GetCobolIndent")
finish
endif
let s:skip = 'getline(".") =~ "^.\\{6\\}[*/$-]\\|\"[^\"]*\""'
function! s:prevgood(lnum)
" Find a non-blank line above the current line.
" Skip over comments.
let lnum = a:lnum
while lnum > 0
let lnum = prevnonblank(lnum - 1)
let line = getline(lnum)
if line !~? '^\s*[*/$-]' && line !~? '^.\{6\}[*/$CD-]'
break
endif
endwhile
return lnum
endfunction
function! s:stripped(lnum)
return substitute(strpart(getline(a:lnum),0,72),'^\s*','','')
endfunction
function! s:optionalblock(lnum,ind,blocks,clauses)
let ind = a:ind
let clauses = '\c\<\%(\<NOT\s\+\)\@<!\%(NOT\s\+\)\=\%('.a:clauses.'\)'
let begin = '\c-\@<!\<\%('.a:blocks.'\)\>'
let beginfull = begin.'\ze.*\%(\n\%(\s*\%([*/$-].*\)\=\n\)*\)\=\s*\%('.clauses.'\)'
let end = '\c\<end-\%('.a:blocks.'\)\>\|\%(\.\%( \|$\)\)\@='
let cline = s:stripped(a:lnum)
let line = s:stripped(s:prevgood(a:lnum))
if cline =~? clauses "&& line !~? '^search\>'
call cursor(a:lnum,1)
let lastclause = searchpair(beginfull,clauses,end,'bWr',s:skip)
if getline(lastclause) =~? clauses && s:stripped(lastclause) !~? '^'.begin
let ind = indent(lastclause)
elseif lastclause > 0
let ind = indent(lastclause) + shiftwidth()
"let ind = ind + shiftwidth()
endif
elseif line =~? clauses && cline !~? end
let ind = ind + shiftwidth()
endif
return ind
endfunction
function! GetCobolIndent(lnum) abort
let minshft = 6
let ashft = minshft + 1
let bshft = ashft + 4
" (Obsolete) numbered lines
if getline(a:lnum) =~? '^\s*\d\{6\}\%($\|[ */$CD-]\)'
return 0
endif
let cline = s:stripped(a:lnum)
" Comments, etc. must start in the 7th column
if cline =~? '^[*/$-]'
return minshft
elseif cline =~# '^[CD]' && indent(a:lnum) == minshft
return minshft
endif
" Divisions, sections, and file descriptions start in area A
if cline =~? '\<\(DIVISION\|SECTION\)\%($\|\.\)' || cline =~? '^[FS]D\>'
return ashft
endif
" Fields
if cline =~? '^0*\(1\|77\)\>'
return ashft
endif
if cline =~? '^\d\+\>'
let cnum = matchstr(cline,'^\d\+\>')
let default = 0
let step = -1
while step < 2
let lnum = a:lnum
while lnum > 0 && lnum < line('$') && lnum > a:lnum - 500 && lnum < a:lnum + 500
let lnum = step > 0 ? nextnonblank(lnum + step) : prevnonblank(lnum + step)
let line = getline(lnum)
let lindent = indent(lnum)
if line =~? '^\s*\d\+\>'
let num = matchstr(line,'^\s*\zs\d\+\>')
if 0+cnum == num
return lindent
elseif 0+cnum > num && default < lindent + shiftwidth()
let default = lindent + shiftwidth()
endif
elseif lindent < bshft && lindent >= ashft
break
endif
endwhile
let step = step + 2
endwhile
return default ? default : bshft
endif
let lnum = s:prevgood(a:lnum)
" Hit the start of the file, use "zero" indent.
if lnum == 0
return ashft
endif
" Initial spaces are ignored
let line = s:stripped(lnum)
let ind = indent(lnum)
" Paragraphs. There may be some false positives.
if cline =~? '^\(\a[A-Z0-9-]*[A-Z0-9]\|\d[A-Z0-9-]*\a\)\.' "\s*$'
if cline !~? '^EXIT\s*\.' && line =~? '\.\s*$'
return ashft
endif
endif
" Paragraphs in the identification division.
"if cline =~? '^\(PROGRAM-ID\|AUTHOR\|INSTALLATION\|' .
"\ 'DATE-WRITTEN\|DATE-COMPILED\|SECURITY\)\>'
"return ashft
"endif
if line =~? '\.$'
" XXX
return bshft
endif
if line =~? '^PERFORM\>'
let perfline = substitute(line, '\c^PERFORM\s*', "", "")
if perfline =~? '^\%(\k\+\s\+TIMES\)\=\s*$'
let ind = ind + shiftwidth()
elseif perfline =~? '^\%(WITH\s\+TEST\|VARYING\|UNTIL\)\>.*[^.]$'
let ind = ind + shiftwidth()
endif
endif
if line =~? '^\%(IF\|THEN\|ELSE\|READ\|EVALUATE\|SEARCH\|SELECT\)\>'
let ind = ind + shiftwidth()
endif
let ind = s:optionalblock(a:lnum,ind,'ADD\|COMPUTE\|DIVIDE\|MULTIPLY\|SUBTRACT','ON\s\+SIZE\s\+ERROR')
let ind = s:optionalblock(a:lnum,ind,'STRING\|UNSTRING\|ACCEPT\|DISPLAY\|CALL','ON\s\+OVERFLOW\|ON\s\+EXCEPTION')
if cline !~? '^AT\s\+END\>' || line !~? '^SEARCH\>'
let ind = s:optionalblock(a:lnum,ind,'DELETE\|REWRITE\|START\|WRITE\|READ','INVALID\s\+KEY\|AT\s\+END\|NO\s\+DATA\|AT\s\+END-OF-PAGE')
endif
if cline =~? '^WHEN\>'
call cursor(a:lnum,1)
" We also search for READ so that contained AT ENDs are skipped
let lastclause = searchpair('\c-\@<!\<\%(SEARCH\|EVALUATE\|READ\)\>','\c\<\%(WHEN\|AT\s\+END\)\>','\c\<END-\%(SEARCH\|EVALUATE\|READ\)\>','bW',s:skip)
let g:foo = s:stripped(lastclause)
if s:stripped(lastclause) =~? '\c\<\%(WHEN\|AT\s\+END\)\>'
"&& s:stripped(lastclause) !~? '^\%(SEARCH\|EVALUATE\|READ\)\>'
let ind = indent(lastclause)
elseif lastclause > 0
let ind = indent(lastclause) + shiftwidth()
endif
elseif line =~? '^WHEN\>'
let ind = ind + shiftwidth()
endif
"I'm not sure why I had this
"if line =~? '^ELSE\>-\@!' && line !~? '\.$'
"let ind = indent(s:prevgood(lnum))
"endif
if cline =~? '^\(END\)\>-\@!'
" On lines with just END, 'guess' a simple shift left
let ind = ind - shiftwidth()
elseif cline =~? '^\(END-IF\|THEN\|ELSE\)\>-\@!'
call cursor(a:lnum,indent(a:lnum))
let match = searchpair('\c-\@<!\<IF\>','\c-\@<!\%(THEN\|ELSE\)\>','\c-\@<!\<END-IF\>\zs','bnW',s:skip)
if match > 0
let ind = indent(match)
endif
elseif cline =~? '^END-[A-Z]'
let beginword = matchstr(cline,'\c\<END-\zs[A-Z0-9-]\+')
let endword = 'END-'.beginword
let first = 0
let suffix = '.*\%(\n\%(\%(\s*\|.\{6\}\)[*/].*\n\)*\)\=\s*'
if beginword =~? '^\%(ADD\|COMPUTE\|DIVIDE\|MULTIPLY\|SUBTRACT\)$'
let beginword = beginword . suffix . '\<\%(NOT\s\+\)\=ON\s\+SIZE\s\+ERROR'
let g:beginword = beginword
let first = 1
elseif beginword =~? '^\%(STRING\|UNSTRING\)$'
let beginword = beginword . suffix . '\<\%(NOT\s\+\)\=ON\s\+OVERFLOW'
let first = 1
elseif beginword =~? '^\%(ACCEPT\|DISPLAY\)$'
let beginword = beginword . suffix . '\<\%(NOT\s\+\)\=ON\s\+EXCEPTION'
let first = 1
elseif beginword ==? 'CALL'
let beginword = beginword . suffix . '\<\%(NOT\s\+\)\=ON\s\+\%(EXCEPTION\|OVERFLOW\)'
let first = 1
elseif beginword =~? '^\%(DELETE\|REWRITE\|START\|READ\|WRITE\)$'
let first = 1
let beginword = beginword . suffix . '\<\%(NOT\s\+\)\=\(INVALID\s\+KEY'
if beginword =~? '^READ'
let first = 0
let beginword = beginword . '\|AT\s\+END\|NO\s\+DATA'
elseif beginword =~? '^WRITE'
let beginword = beginword . '\|AT\s\+END-OF-PAGE'
endif
let beginword = beginword . '\)'
endif
call cursor(a:lnum,indent(a:lnum))
let match = searchpair('\c-\@<!\<'.beginword.'\>','','\c\<'.endword.'\>\zs','bnW'.(first? 'r' : ''),s:skip)
if match > 0
let ind = indent(match)
elseif cline =~? '^\(END-\(READ\|EVALUATE\|SEARCH\|PERFORM\)\)\>'
let ind = ind - shiftwidth()
endif
endif
return ind < bshft ? bshft : ind
endfunction
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