1" Vim indent file
2" Language:	VisualBasic (ft=vb) / Basic (ft=basic) / SaxBasic (ft=vb)
3" Author:	Johannes Zellner <johannes@zellner.org>
4" Last Change:	Fri, 18 Jun 2004 07:22:42 CEST
5"		Small update 2010 Jul 28 by Maxim Kim
6
7if exists("b:did_indent")
8    finish
9endif
10let b:did_indent = 1
11
12setlocal autoindent
13setlocal indentexpr=VbGetIndent(v:lnum)
14setlocal indentkeys&
15setlocal indentkeys+==~else,=~elseif,=~end,=~wend,=~case,=~next,=~select,=~loop,<:>
16
17let b:undo_indent = "set ai< indentexpr< indentkeys<"
18
19" Only define the function once.
20if exists("*VbGetIndent")
21    finish
22endif
23
24fun! VbGetIndent(lnum)
25    " labels and preprocessor get zero indent immediately
26    let this_line = getline(a:lnum)
27    let LABELS_OR_PREPROC = '^\s*\(\<\k\+\>:\s*$\|#.*\)'
28    if this_line =~? LABELS_OR_PREPROC
29	return 0
30    endif
31
32    " Find a non-blank line above the current line.
33    " Skip over labels and preprocessor directives.
34    let lnum = a:lnum
35    while lnum > 0
36	let lnum = prevnonblank(lnum - 1)
37	let previous_line = getline(lnum)
38	if previous_line !~? LABELS_OR_PREPROC
39	    break
40	endif
41    endwhile
42
43    " Hit the start of the file, use zero indent.
44    if lnum == 0
45	return 0
46    endif
47
48    let ind = indent(lnum)
49
50    " Add
51    if previous_line =~? '^\s*\<\(begin\|\%(\%(private\|public\|friend\)\s\+\)\=\%(function\|sub\|property\)\|select\|case\|default\|if\|else\|elseif\|do\|for\|while\|enum\|with\)\>'
52	let ind = ind + &sw
53    endif
54
55    " Subtract
56    if this_line =~? '^\s*\<end\>\s\+\<select\>'
57	if previous_line !~? '^\s*\<select\>'
58	    let ind = ind - 2 * &sw
59	else
60	    " this case is for an empty 'select' -- 'end select'
61	    " (w/o any case statements) like:
62	    "
63	    " select case readwrite
64	    " end select
65	    let ind = ind - &sw
66	endif
67    elseif this_line =~? '^\s*\<\(end\|else\|elseif\|until\|loop\|next\|wend\)\>'
68	let ind = ind - &sw
69    elseif this_line =~? '^\s*\<\(case\|default\)\>'
70	if previous_line !~? '^\s*\<select\>'
71	    let ind = ind - &sw
72	endif
73    endif
74
75    return ind
76endfun
77
78" vim:sw=4
79