1" Vim indent file
2" Language:	SDL
3" Maintainer:	Michael Piefel <piefel@informatik.hu-berlin.de>
4" Last Change:	2001 Sep 17
5
6" Shamelessly stolen from the Vim-Script indent file
7
8" Only load this indent file when no other was loaded.
9if exists("b:did_indent")
10  finish
11endif
12let b:did_indent = 1
13
14setlocal indentexpr=GetSDLIndent()
15setlocal indentkeys+==~end,=~state,*<Return>
16
17" Only define the function once.
18if exists("*GetSDLIndent")
19"  finish
20endif
21
22set cpo-=C
23
24function! GetSDLIndent()
25  " Find a non-blank line above the current line.
26  let lnum = prevnonblank(v:lnum - 1)
27
28  " At the start of the file use zero indent.
29  if lnum == 0
30    return 0
31  endif
32
33  let ind = indent(lnum)
34  let virtuality = '^\s*\(\(virtual\|redefined\|finalized\)\s\+\)\=\s*'
35
36  " Add a single space to comments which use asterisks
37  if getline(lnum) =~ '^\s*\*'
38    let ind = ind - 1
39  endif
40  if getline(v:lnum) =~ '^\s*\*'
41    let ind = ind + 1
42  endif
43
44  " Add a 'shiftwidth' after states, different blocks, decision (and alternatives), inputs
45  if (getline(lnum) =~? '^\s*\(start\|state\|system\|package\|connection\|channel\|alternative\|macro\|operator\|newtype\|select\|substructure\|decision\|generator\|refinement\|service\|method\|exceptionhandler\|asntype\|syntype\|value\|(.*):\|\(priority\s\+\)\=input\|provided\)'
46    \ || getline(lnum) =~? virtuality . '\(process\|procedure\|block\|object\)')
47    \ && getline(lnum) !~? 'end[[:alpha:]]\+;$'
48    let ind = ind + &sw
49  endif
50
51  " Subtract a 'shiftwidth' after states
52  if getline(lnum) =~? '^\s*\(stop\|return\>\|nextstate\)'
53    let ind = ind - &sw
54  endif
55
56  " Subtract a 'shiftwidth' on on end (uncompleted line)
57  if getline(v:lnum) =~? '^\s*end\>'
58    let ind = ind - &sw
59  endif
60
61  " Put each alternatives where the corresponding decision was
62  if getline(v:lnum) =~? '^\s*\((.*)\|else\):'
63    normal k
64    let ind = indent(searchpair('^\s*decision', '', '^\s*enddecision', 'bW',
65      \ 'synIDattr(synID(line("."), col("."), 0), "name") =~? "sdlString"'))
66  endif
67
68  " Put each state where the preceding state was
69  if getline(v:lnum) =~? '^\s*state\>'
70    let ind = indent(search('^\s*start', 'bW'))
71  endif
72
73  " Systems and packages are always in column 0
74  if getline(v:lnum) =~? '^\s*\(\(end\)\=system\|\(end\)\=package\)'
75    return 0;
76  endif
77
78  " Put each end* where the corresponding begin was
79  if getline(v:lnum) =~? '^\s*end[[:alpha:]]'
80    normal k
81    let partner=matchstr(getline(v:lnum), '\(' . virtuality . 'end\)\@<=[[:alpha:]]\+')
82    let ind = indent(searchpair(virtuality . partner, '', '^\s*end' . partner, 'bW',
83      \ 'synIDattr(synID(line("."), col("."), 0), "name") =~? "sdlString"'))
84  endif
85
86  return ind
87endfunction
88
89" vim:sw=2
90