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" Vim indent file
" Language: Ada
" Maintainer: Neil Bird <neil@fnxweb.com>
" Last Change: 2003 May 20
" Version: $Id$
" Look for the latest version at http://vim.sourceforge.net/
"
" 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")
finish
endif
let b:did_indent = 1
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:AdaBlockStart = '^\s*\(if\>\|while\>\|else\>\|elsif\>\|loop\>\|for\>.*\<loop\>\|declare\>\|begin\>\|type\>.*\<is\s*$\|\(type\>.*\)\=\<record\>\|procedure\>\|function\>\|accept\>\|do\>\|task\>\|package\>\|then\>\|when\>\|is\>\)'
let s:AdaComment = "\\v^(\"[^\"]*\"|'.'|[^\"']){-}\\zs\\s*--.*"
" Try to find indent of the block we're in (and about to complete)
" 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), s:AdaComment, '', '' )
while lnum > 1
if a:stop_at != '' && line =~ '^\s*' . a:stop_at && indent(lnum) < a:prev_indent
return -1
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), s:AdaComment, '', '' )
if line !~ '^\s*$' && line !~ '^\s*#'
break
endif
let lnum = prevnonblank(lnum - 1)
if lnum <= 0
return a:prev_indent
endif
endwhile
endwhile
" Fallback - just move back one
return a:prev_indent - &sw
endfunction
" Try to find indent of the block we're in (and about to complete),
" including handling of nested blocks. Works on the 'end' of a block.
" prev_indent = the previous line's indent
" prev_lnum = previous line (to start looking on)
" blockstart = expr. that indicates a possible start of this block
" blockend = expr. that indicates a possible end of this block
function s:EndBlockIndent( prev_indent, prev_lnum, blockstart, blockend )
let lnum = a:prev_lnum
let line = getline(lnum)
let ends = 0
while lnum > 1
if getline(lnum) =~ '^\s*' . a:blockstart
let ind = indent(lnum)
if ends <= 0
if ind < a:prev_indent
return ind
endif
else
let ends = ends - 1
endif
elseif getline(lnum) =~ '^\s*' . a:blockend
let ends = ends + 1
endif
let lnum = prevnonblank(lnum - 1)
" Get previous non-blank/non-comment-only line
while 1
let line = getline(lnum)
let line = substitute( line, s:AdaComment, '', '' )
if line !~ '^\s*$'
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 - &sw
endfunction
" As per MainBlockIndent, but 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), s:AdaComment, '', '' )
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*$'
let ind = indent(prev_lnum)
if ind < a:current_indent
return ind
endif
endif
endwhile
" Fallback - just use current one
return a:current_indent
endfunction
" Find correct indent of a new line based upon what went before
function GetAdaIndent()
" Find a non-blank line above the current line.
let lnum = prevnonblank(v:lnum - 1)
let ind = indent(lnum)
let package_line = 0
" Get previous non-blank/non-comment-only/non-cpp line
while 1
let line = substitute( getline(lnum), s:AdaComment, '', '' )
if line !~ '^\s*$' && 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)
" 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 + &sw
endif
elseif line =~ '^\s*\(case\|exception\)\>'
" Move indent in twice (next 'when' will move back)
let ind = ind + 2 * &sw
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+&sw, lnum, 'type\>', '' )
elseif line =~ '\(^\s*new\>.*\)\@<!)\s*[;,]\s*$'
" Revert to indent of line that started this parenthesis pair
exe lnum
exe 'normal! $F)%'
if getline('.') =~ '^\s*('
" Dire layout - use previous indent (could check for AdaComment here)
let ind = indent( prevnonblank( line('.')-1 ) )
else
let ind = indent('.')
endif
exe v:lnum
elseif line =~ '[.=(]\s*$'
" A statement continuation - move in one
let ind = ind + &sw
elseif line =~ '^\s*new\>'
" Multiple line generic instantiation ('package blah is\nnew thingy')
let ind = s:StatementIndent( ind - &sw, lnum )
elseif line =~ ';\s*$'
" Statement end - try to find current statement-start indent
let ind = s:StatementIndent( ind, lnum )
endif
" Check for potential argument list on next line
let continuation = (line =~ '[A-Za-z0-9_]\s*$')
" 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*('
let ind = ind + &sw
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\>', '' ) + &sw
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, '\(case\|exception\)\>', '' ) + &sw
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, '\(if\|while\|for\|loop\|accept\|begin\|record\|case\|exception\)\>', '' )
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
" vim: set sw=3 sts=3 :
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