227 lines
8.6 KiB
VimL
227 lines
8.6 KiB
VimL
" Vim indent file
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" Language: cobol
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" Maintainer: Ankit Jain <ajatkj@yahoo.co.in>
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" (formerly Tim Pope <vimNOSPAM@tpope.info>)
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" $Id: cobol.vim,v 1.1 2007/05/05 18:08:19 vimboss Exp $
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" Last Update: By Ankit Jain on 22.03.2019
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" Ankit Jain 22.03.2019 Changes & fixes:
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" Allow chars in 1st 6 columns
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" #C22032019
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" Ankit Jain 24.09.2021 add b:undo_indent (request by tpope)
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if exists("b:did_indent")
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finish
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endif
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let b:did_indent = 1
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setlocal expandtab
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setlocal indentexpr=GetCobolIndent(v:lnum)
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setlocal indentkeys&
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setlocal indentkeys+=0<*>,0/,0$,0=01,=~division,=~section,0=~end,0=~then,0=~else,0=~when,*<Return>,.
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let b:undo_indent = "setlocal expandtab< indentexpr< indentkeys<"
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" Only define the function once.
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if exists("*GetCobolIndent")
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finish
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endif
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let s:skip = 'getline(".") =~ "^.\\{6\\}[*/$-]\\|\"[^\"]*\""'
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function! s:prevgood(lnum)
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" Find a non-blank line above the current line.
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" Skip over comments.
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let lnum = a:lnum
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while lnum > 0
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let lnum = prevnonblank(lnum - 1)
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let line = getline(lnum)
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if line !~? '^\s*[*/$-]' && line !~? '^.\{6\}[*/$CD-]'
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break
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endif
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endwhile
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return lnum
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endfunction
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function! s:stripped(lnum)
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return substitute(strpart(getline(a:lnum),0,72),'^\s*','','')
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endfunction
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function! s:optionalblock(lnum,ind,blocks,clauses)
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let ind = a:ind
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let clauses = '\c\<\%(\<NOT\s\+\)\@<!\%(NOT\s\+\)\=\%('.a:clauses.'\)'
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let begin = '\c-\@<!\<\%('.a:blocks.'\)\>'
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let beginfull = begin.'\ze.*\%(\n\%(\s*\%([*/$-].*\)\=\n\)*\)\=\s*\%('.clauses.'\)'
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let end = '\c\<end-\%('.a:blocks.'\)\>\|\%(\.\%( \|$\)\)\@='
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let cline = s:stripped(a:lnum)
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let line = s:stripped(s:prevgood(a:lnum))
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if cline =~? clauses "&& line !~? '^search\>'
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call cursor(a:lnum,1)
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let lastclause = searchpair(beginfull,clauses,end,'bWr',s:skip)
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if getline(lastclause) =~? clauses && s:stripped(lastclause) !~? '^'.begin
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let ind = indent(lastclause)
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elseif lastclause > 0
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let ind = indent(lastclause) + shiftwidth()
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"let ind = ind + shiftwidth()
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endif
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elseif line =~? clauses && cline !~? end
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let ind = ind + shiftwidth()
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endif
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return ind
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endfunction
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function! GetCobolIndent(lnum) abort
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let minshft = 6
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let ashft = minshft + 1
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let bshft = ashft + 4
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" (Obsolete) numbered lines
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" #C22032019: Columns 1-6 could have alphabets as well as numbers
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"if getline(a:lnum) =~? '^\s*\d\{6\}\%($\|[ */$CD-]\)'
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if getline(a:lnum) =~? '^\s*[a-zA-Z0-9]\{6\}\%($\|[ */$CD-]\)'
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return 0
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endif
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let cline = s:stripped(a:lnum)
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" Comments, etc. must start in the 7th column
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if cline =~? '^[*/$-]'
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return minshft
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elseif cline =~# '^[CD]' && indent(a:lnum) == minshft
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return minshft
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endif
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" Divisions, sections, and file descriptions start in area A
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if cline =~? '\<\(DIVISION\|SECTION\)\%($\|\.\)' || cline =~? '^[FS]D\>'
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return ashft
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endif
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" Fields
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if cline =~? '^0*\(1\|77\)\>'
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return ashft
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endif
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if cline =~? '^\d\+\>'
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let cnum = matchstr(cline,'^\d\+\>')
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let default = 0
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let step = -1
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while step < 2
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let lnum = a:lnum
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while lnum > 0 && lnum < line('$') && lnum > a:lnum - 500 && lnum < a:lnum + 500
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let lnum = step > 0 ? nextnonblank(lnum + step) : prevnonblank(lnum + step)
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let line = getline(lnum)
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let lindent = indent(lnum)
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if line =~? '^\s*\d\+\>'
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let num = matchstr(line,'^\s*\zs\d\+\>')
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if 0+cnum == num
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return lindent
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elseif 0+cnum > num && default < lindent + shiftwidth()
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let default = lindent + shiftwidth()
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endif
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elseif lindent < bshft && lindent >= ashft
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break
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endif
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endwhile
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let step = step + 2
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endwhile
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return default ? default : bshft
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endif
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let lnum = s:prevgood(a:lnum)
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" Hit the start of the file, use "zero" indent.
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if lnum == 0
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return ashft
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endif
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" Initial spaces are ignored
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let line = s:stripped(lnum)
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let ind = indent(lnum)
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" Paragraphs. There may be some false positives.
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if cline =~? '^\(\a[A-Z0-9-]*[A-Z0-9]\|\d[A-Z0-9-]*\a\)\.' "\s*$'
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if cline !~? '^EXIT\s*\.' && line =~? '\.\s*$'
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return ashft
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endif
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endif
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" Paragraphs in the identification division.
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"if cline =~? '^\(PROGRAM-ID\|AUTHOR\|INSTALLATION\|' .
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"\ 'DATE-WRITTEN\|DATE-COMPILED\|SECURITY\)\>'
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"return ashft
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"endif
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if line =~? '\.$'
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" XXX
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return bshft
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endif
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if line =~? '^PERFORM\>'
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let perfline = substitute(line, '\c^PERFORM\s*', "", "")
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if perfline =~? '^\%(\k\+\s\+TIMES\)\=\s*$'
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let ind = ind + shiftwidth()
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elseif perfline =~? '^\%(WITH\s\+TEST\|VARYING\|UNTIL\)\>.*[^.]$'
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let ind = ind + shiftwidth()
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endif
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endif
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if line =~? '^\%(IF\|THEN\|ELSE\|READ\|EVALUATE\|SEARCH\|SELECT\)\>'
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let ind = ind + shiftwidth()
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endif
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let ind = s:optionalblock(a:lnum,ind,'ADD\|COMPUTE\|DIVIDE\|MULTIPLY\|SUBTRACT','ON\s\+SIZE\s\+ERROR')
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let ind = s:optionalblock(a:lnum,ind,'STRING\|UNSTRING\|ACCEPT\|DISPLAY\|CALL','ON\s\+OVERFLOW\|ON\s\+EXCEPTION')
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if cline !~? '^AT\s\+END\>' || line !~? '^SEARCH\>'
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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')
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endif
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if cline =~? '^WHEN\>'
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call cursor(a:lnum,1)
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" We also search for READ so that contained AT ENDs are skipped
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let lastclause = searchpair('\c-\@<!\<\%(SEARCH\|EVALUATE\|READ\)\>','\c\<\%(WHEN\|AT\s\+END\)\>','\c\<END-\%(SEARCH\|EVALUATE\|READ\)\>','bW',s:skip)
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let g:foo = s:stripped(lastclause)
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if s:stripped(lastclause) =~? '\c\<\%(WHEN\|AT\s\+END\)\>'
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"&& s:stripped(lastclause) !~? '^\%(SEARCH\|EVALUATE\|READ\)\>'
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let ind = indent(lastclause)
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elseif lastclause > 0
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let ind = indent(lastclause) + shiftwidth()
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endif
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elseif line =~? '^WHEN\>'
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let ind = ind + shiftwidth()
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endif
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"I'm not sure why I had this
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"if line =~? '^ELSE\>-\@!' && line !~? '\.$'
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"let ind = indent(s:prevgood(lnum))
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"endif
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if cline =~? '^\(END\)\>-\@!'
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" On lines with just END, 'guess' a simple shift left
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let ind = ind - shiftwidth()
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elseif cline =~? '^\(END-IF\|THEN\|ELSE\)\>-\@!'
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call cursor(a:lnum,indent(a:lnum))
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let match = searchpair('\c-\@<!\<IF\>','\c-\@<!\%(THEN\|ELSE\)\>','\c-\@<!\<END-IF\>\zs','bnW',s:skip)
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if match > 0
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let ind = indent(match)
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endif
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elseif cline =~? '^END-[A-Z]'
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let beginword = matchstr(cline,'\c\<END-\zs[A-Z0-9-]\+')
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let endword = 'END-'.beginword
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let first = 0
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let suffix = '.*\%(\n\%(\%(\s*\|.\{6\}\)[*/].*\n\)*\)\=\s*'
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if beginword =~? '^\%(ADD\|COMPUTE\|DIVIDE\|MULTIPLY\|SUBTRACT\)$'
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let beginword = beginword . suffix . '\<\%(NOT\s\+\)\=ON\s\+SIZE\s\+ERROR'
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let g:beginword = beginword
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let first = 1
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elseif beginword =~? '^\%(STRING\|UNSTRING\)$'
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let beginword = beginword . suffix . '\<\%(NOT\s\+\)\=ON\s\+OVERFLOW'
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let first = 1
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elseif beginword =~? '^\%(ACCEPT\|DISPLAY\)$'
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let beginword = beginword . suffix . '\<\%(NOT\s\+\)\=ON\s\+EXCEPTION'
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let first = 1
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elseif beginword ==? 'CALL'
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let beginword = beginword . suffix . '\<\%(NOT\s\+\)\=ON\s\+\%(EXCEPTION\|OVERFLOW\)'
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let first = 1
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elseif beginword =~? '^\%(DELETE\|REWRITE\|START\|READ\|WRITE\)$'
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let first = 1
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let beginword = beginword . suffix . '\<\%(NOT\s\+\)\=\(INVALID\s\+KEY'
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if beginword =~? '^READ'
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let first = 0
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let beginword = beginword . '\|AT\s\+END\|NO\s\+DATA'
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elseif beginword =~? '^WRITE'
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let beginword = beginword . '\|AT\s\+END-OF-PAGE'
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endif
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let beginword = beginword . '\)'
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endif
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call cursor(a:lnum,indent(a:lnum))
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let match = searchpair('\c-\@<!\<'.beginword.'\>','','\c\<'.endword.'\>\zs','bnW'.(first? 'r' : ''),s:skip)
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if match > 0
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let ind = indent(match)
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elseif cline =~? '^\(END-\(READ\|EVALUATE\|SEARCH\|PERFORM\)\)\>'
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let ind = ind - shiftwidth()
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endif
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endif
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return ind < bshft ? bshft : ind
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endfunction
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