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" Vim indent file
" Language:         EDC
" Maintainer:       Viktor Kojouharov
" Latest Revision:  2007 02 24

if exists("b:did_indent")
  finish
endif
let b:did_indent = 1

setlocal indentexpr=GetEDCIndent()
setlocal indentkeys=0{,0},!^F,o,O

if exists("*GetEDCIndent")
  finish
endif

function s:prevnonblanknoncomment(lnum)
  let lnum = a:lnum
  while lnum > 1
    let lnum = prevnonblank(lnum)
    let line = getline(lnum)
    if line =~ '\*/'
      while lnum > 1 && line !~ '/\*'
	let lnum -= 1
      endwhile
      if line =~ '^\s*/\*'
	let lnum -= 1
      else
	break
      endif
    elseif line =~ '^\s*//'
      let lnum -= 1
    else
      break
    endif
  endwhile
  return lnum
endfunction

function s:count_braces(lnum, count_open)
  let n_open = 0
  let n_close = 0
  let line = getline(a:lnum)
  let pattern = '[{}]'
  let i = match(line, pattern)
  while i != -1
    if synIDattr(synID(a:lnum, i + 1, 0), 'name') !~ 'c\%(CommentL\|Comment\|StringQ\{1,2}\)'
      if line[i] == '{'
	let n_open += 1
      elseif line[i] == '}'
	if n_open > 0
	  let n_open -= 1
	else
	  let n_close += 1
	endif
      endif
    endif
    let i = match(line, pattern, i + 1)
  endwhile
  return a:count_open ? n_open : n_close
endfunction

function GetEDCIndent()
  let line = getline(v:lnum)
  if line =~ '^\s*\*' || line =~ '^\s*//' || line =~ '^\s*}'
    return cindent(v:lnum)
  endif

  let pnum = s:prevnonblanknoncomment(v:lnum - 1)
  if pnum == 0
    return 0
  endif

  let ind = indent(pnum) + s:count_braces(pnum, 1) * &sw

  let pline = getline(pnum)
  if pline =~ '}\s*$'
    let ind -= (s:count_braces(pnum, 0) - (pline =~ '^\s*}' ? 1 : 0)) * &sw
  endif

  return ind
endfunction