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Current File : /usr/share/vim/vim81/indent/ada.vim
"------------------------------------------------------------------------------
"  Description: Vim Ada indent file
"     Language: Ada (2005)
"	   $Id: ada.vim 887 2008-07-08 14:29:01Z krischik $
"    Copyright: Copyright (C) 2006 Martin Krischik
"   Maintainer: Martin Krischik <krischik@users.sourceforge.net>
"		Neil Bird <neil@fnxweb.com>
"		Ned Okie <nokie@radford.edu>
"      $Author: krischik $
"	 $Date: 2008-07-08 16:29:01 +0200 (Di, 08 Jul 2008) $
"      Version: 4.6
"    $Revision: 887 $
"     $HeadURL: https://gnuada.svn.sourceforge.net/svnroot/gnuada/trunk/tools/vim/indent/ada.vim $
"      History: 24.05.2006 MK Unified Headers
"		16.07.2006 MK Ada-Mode as vim-ball
"		15.10.2006 MK Bram's suggestion for runtime integration
"		05.11.2006 MK Bram suggested to save on spaces
"		19.09.2007 NO g: missing before ada#Comment
"    Help Page: ft-vim-indent
"------------------------------------------------------------------------------
" ToDo:
"  Verify handling of multi-line exprs. and recovery upon the final ';'.
"  Correctly find comments given '"' and "" ==> " syntax.
"  Combine the two large block-indent functions into one?
"------------------------------------------------------------------------------

" Only load this indent file when no other was loaded.
if exists("b:did_indent") || version < 700
   finish
endif

let b:did_indent = 45

setlocal indentexpr=GetAdaIndent()
setlocal indentkeys-=0{,0}
setlocal indentkeys+=0=~then,0=~end,0=~elsif,0=~when,0=~exception,0=~begin,0=~is,0=~record

" Only define the functions once.
if exists("*GetAdaIndent")
   finish
endif
let s:keepcpo= &cpo
set cpo&vim

if exists("g:ada_with_gnat_project_files")
   let s:AdaBlockStart = '^\s*\(if\>\|while\>\|else\>\|elsif\>\|loop\>\|for\>.*\<\(loop\|use\)\>\|declare\>\|begin\>\|type\>.*\<is\>[^;]*$\|\(type\>.*\)\=\<record\>\|procedure\>\|function\>\|accept\>\|do\>\|task\>\|package\>\|project\>\|then\>\|when\>\|is\>\)'
else
   let s:AdaBlockStart = '^\s*\(if\>\|while\>\|else\>\|elsif\>\|loop\>\|for\>.*\<\(loop\|use\)\>\|declare\>\|begin\>\|type\>.*\<is\>[^;]*$\|\(type\>.*\)\=\<record\>\|procedure\>\|function\>\|accept\>\|do\>\|task\>\|package\>\|then\>\|when\>\|is\>\)'
endif

" Section: s:MainBlockIndent {{{1
"
" Try to find indent of the block we're in
" prev_indent = the previous line's indent
" prev_lnum   = previous line (to start looking on)
" blockstart  = expr. that indicates a possible start of this block
" stop_at     = if non-null, if a matching line is found, gives up!
" No recursive previous block analysis: simply look for a valid line
" with a lesser or equal indent than we currently (on prev_lnum) have.
" This shouldn't work as well as it appears to with lines that are currently
" nowhere near the correct indent (e.g., start of line)!
" Seems to work OK as it 'starts' with the indent of the /previous/ line.
function s:MainBlockIndent (prev_indent, prev_lnum, blockstart, stop_at)
   let lnum = a:prev_lnum
   let line = substitute( getline(lnum), g:ada#Comment, '', '' )
   while lnum > 1
      if a:stop_at != ''  &&  line =~ '^\s*' . a:stop_at  &&  indent(lnum) < a:prev_indent
	 return a:prev_indent
      elseif line =~ '^\s*' . a:blockstart
	 let ind = indent(lnum)
	 if ind < a:prev_indent
	    return ind
	 endif
      endif

      let lnum = prevnonblank(lnum - 1)
      " Get previous non-blank/non-comment-only line
      while 1
	 let line = substitute( getline(lnum), g:ada#Comment, '', '' )
	 if line !~ '^\s*$' && line !~ '^\s*#'
	    break
	 endif
	 let lnum = prevnonblank(lnum - 1)
	 if lnum <= 0
	    return a:prev_indent
	 endif
      endwhile
   endwhile
   " Fallback - just move back one
   return a:prev_indent - shiftwidth()
endfunction MainBlockIndent

" Section: s:EndBlockIndent {{{1
"
" Try to find indent of the block we're in (and about to complete),
" including handling of nested blocks. Works on the 'end' of a block.
" prev_indent = the previous line's indent
" prev_lnum   = previous line (to start looking on)
" blockstart  = expr. that indicates a possible start of this block
" blockend    = expr. that indicates a possible end of this block
function s:EndBlockIndent( prev_indent, prev_lnum, blockstart, blockend )
   let lnum = a:prev_lnum
   let line = getline(lnum)
   let ends = 0
   while lnum > 1
      if getline(lnum) =~ '^\s*' . a:blockstart
	 let ind = indent(lnum)
	 if ends <= 0
	    if ind < a:prev_indent
	       return ind
	    endif
	 else
	    let ends = ends - 1
	 endif
      elseif getline(lnum) =~ '^\s*' . a:blockend
	 let ends = ends + 1
      endif

      let lnum = prevnonblank(lnum - 1)
      " Get previous non-blank/non-comment-only line
      while 1
	 let line = getline(lnum)
	 let line = substitute( line, g:ada#Comment, '', '' )
	 if line !~ '^\s*$'
	    break
	 endif
	 let lnum = prevnonblank(lnum - 1)
	 if lnum <= 0
	    return a:prev_indent
	 endif
      endwhile
   endwhile
   " Fallback - just move back one
   return a:prev_indent - shiftwidth()
endfunction EndBlockIndent

" Section: s:StatementIndent {{{1
"
" Return indent of previous statement-start
" (after we've indented due to multi-line statements).
" This time, we start searching on the line *before* the one given (which is
" the end of a statement - we want the previous beginning).
function s:StatementIndent( current_indent, prev_lnum )
   let lnum  = a:prev_lnum
   while lnum > 0
      let prev_lnum = lnum
      let lnum = prevnonblank(lnum - 1)
      " Get previous non-blank/non-comment-only line
      while 1
	 let line = substitute( getline(lnum), g:ada#Comment, '', '' )

	 if line !~ '^\s*$' && line !~ '^\s*#'
	    break
	 endif
	 let lnum = prevnonblank(lnum - 1)
	 if lnum <= 0
	    return a:current_indent
	 endif
      endwhile
      " Leave indent alone if our ';' line is part of a ';'-delineated
      " aggregate (e.g., procedure args.) or first line after a block start.
      if line =~ s:AdaBlockStart || line =~ '(\s*$'
	 return a:current_indent
      endif
      if line !~ '[.=(]\s*$'
	 let ind = indent(prev_lnum)
	 if ind < a:current_indent
	    return ind
	 endif
      endif
   endwhile
   " Fallback - just use current one
   return a:current_indent
endfunction StatementIndent


" Section: GetAdaIndent {{{1
"
" Find correct indent of a new line based upon what went before
"
function GetAdaIndent()
   " Find a non-blank line above the current line.
   let lnum = prevnonblank(v:lnum - 1)
   let ind = indent(lnum)
   let package_line = 0

   " Get previous non-blank/non-comment-only/non-cpp line
   while 1
      let line = substitute( getline(lnum), g:ada#Comment, '', '' )
      if line !~ '^\s*$' && line !~ '^\s*#'
	 break
      endif
      let lnum = prevnonblank(lnum - 1)
      if lnum <= 0
	 return ind
      endif
   endwhile

   " Get default indent (from prev. line)
   let ind = indent(lnum)
   let initind = ind

   " Now check what's on the previous line
   if line =~ s:AdaBlockStart  ||  line =~ '(\s*$'
      " Check for false matches to AdaBlockStart
      let false_match = 0
      if line =~ '^\s*\(procedure\|function\|package\)\>.*\<is\s*new\>'
	 " Generic instantiation
	 let false_match = 1
      elseif line =~ ')\s*;\s*$'  ||  line =~ '^\([^(]*([^)]*)\)*[^(]*;\s*$'
	 " forward declaration
	 let false_match = 1
      endif
      " Move indent in
      if ! false_match
	 let ind = ind + shiftwidth()
      endif
   elseif line =~ '^\s*\(case\|exception\)\>'
      " Move indent in twice (next 'when' will move back)
      let ind = ind + 2 * shiftwidth()
   elseif line =~ '^\s*end\s*record\>'
      " Move indent back to tallying 'type' preceeding the 'record'.
      " Allow indent to be equal to 'end record's.
      let ind = s:MainBlockIndent( ind+shiftwidth(), lnum, 'type\>', '' )
   elseif line =~ '\(^\s*new\>.*\)\@<!)\s*[;,]\s*$'
      " Revert to indent of line that started this parenthesis pair
      exe lnum
      exe 'normal! $F)%'
      if getline('.') =~ '^\s*('
	 " Dire layout - use previous indent (could check for g:ada#Comment here)
	 let ind = indent( prevnonblank( line('.')-1 ) )
      else
	 let ind = indent('.')
      endif
      exe v:lnum
   elseif line =~ '[.=(]\s*$'
      " A statement continuation - move in one
      let ind = ind + shiftwidth()
   elseif line =~ '^\s*new\>'
      " Multiple line generic instantiation ('package blah is\nnew thingy')
      let ind = s:StatementIndent( ind - shiftwidth(), lnum )
   elseif line =~ ';\s*$'
      " Statement end (but not 'end' ) - try to find current statement-start indent
      let ind = s:StatementIndent( ind, lnum )
   endif

   " Check for potential argument list on next line
   let continuation = (line =~ '[A-Za-z0-9_]\s*$')


   " Check current line; search for simplistic matching start-of-block
   let line = getline(v:lnum)
   if line =~ '^\s*#'
      " Start of line for ada-pp
      let ind = 0
   elseif continuation && line =~ '^\s*('
      " Don't do this if we've already indented due to the previous line
      if ind == initind
	 let ind = ind + shiftwidth()
      endif
   elseif line =~ '^\s*\(begin\|is\)\>'
      let ind = s:MainBlockIndent( ind, lnum, '\(procedure\|function\|declare\|package\|task\)\>', 'begin\>' )
   elseif line =~ '^\s*record\>'
      let ind = s:MainBlockIndent( ind, lnum, 'type\>\|for\>.*\<use\>', '' ) + shiftwidth()
   elseif line =~ '^\s*\(else\|elsif\)\>'
      let ind = s:MainBlockIndent( ind, lnum, 'if\>', '' )
   elseif line =~ '^\s*when\>'
      " Align 'when' one /in/ from matching block start
      let ind = s:MainBlockIndent( ind, lnum, '\(case\|exception\)\>', '' ) + shiftwidth()
   elseif line =~ '^\s*end\>\s*\<if\>'
      " End of if statements
      let ind = s:EndBlockIndent( ind, lnum, 'if\>', 'end\>\s*\<if\>' )
   elseif line =~ '^\s*end\>\s*\<loop\>'
      " End of loops
      let ind = s:EndBlockIndent( ind, lnum, '\(\(while\|for\)\>.*\)\?\<loop\>', 'end\>\s*\<loop\>' )
   elseif line =~ '^\s*end\>\s*\<record\>'
      " End of records
      let ind = s:EndBlockIndent( ind, lnum, '\(type\>.*\)\=\<record\>', 'end\>\s*\<record\>' )
   elseif line =~ '^\s*end\>\s*\<procedure\>'
      " End of procedures
      let ind = s:EndBlockIndent( ind, lnum, 'procedure\>.*\<is\>', 'end\>\s*\<procedure\>' )
   elseif line =~ '^\s*end\>\s*\<case\>'
      " End of case statement
      let ind = s:EndBlockIndent( ind, lnum, 'case\>.*\<is\>', 'end\>\s*\<case\>' )
   elseif line =~ '^\s*end\>'
      " General case for end
      let ind = s:MainBlockIndent( ind, lnum, '\(if\|while\|for\|loop\|accept\|begin\|record\|case\|exception\|package\)\>', '' )
   elseif line =~ '^\s*exception\>'
      let ind = s:MainBlockIndent( ind, lnum, 'begin\>', '' )
   elseif line =~ '^\s*then\>'
      let ind = s:MainBlockIndent( ind, lnum, 'if\>', '' )
   endif

   return ind
endfunction GetAdaIndent

let &cpo = s:keepcpo
unlet s:keepcpo

finish " 1}}}

"------------------------------------------------------------------------------
"   Copyright (C) 2006	Martin Krischik
"
"   Vim is Charityware - see ":help license" or uganda.txt for licence details.
"------------------------------------------------------------------------------
" vim: textwidth=78 wrap tabstop=8 shiftwidth=3 softtabstop=3 noexpandtab
" vim: foldmethod=marker
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