1" Language:	xml
2" Maintainer:	Johannes Zellner <johannes@zellner.org>
3" Last Change:	2009-05-26 00:17:25
4" Notes:	1) does not indent pure non-xml code (e.g. embedded scripts)
5"		2) will be confused by unbalanced tags in comments
6"		or CDATA sections.
7"		2009-05-26 patch by Nikolai Weibull
8" TODO: 	implement pre-like tags, see xml_indent_open / xml_indent_close
9
10" Only load this indent file when no other was loaded.
11if exists("b:did_indent")
12    finish
13endif
14let b:did_indent = 1
15
16" [-- local settings (must come before aborting the script) --]
17setlocal indentexpr=XmlIndentGet(v:lnum,1)
18setlocal indentkeys=o,O,*<Return>,<>>,<<>,/,{,}
19
20set cpo-=C
21
22if !exists('b:xml_indent_open')
23    let b:xml_indent_open = '.\{-}<\a'
24    " pre tag, e.g. <address>
25    " let b:xml_indent_open = '.\{-}<[/]\@!\(address\)\@!'
26endif
27
28if !exists('b:xml_indent_close')
29    let b:xml_indent_close = '.\{-}</'
30    " end pre tag, e.g. </address>
31    " let b:xml_indent_close = '.\{-}</\(address\)\@!'
32endif
33
34" [-- finish, if the function already exists --]
35if exists('*XmlIndentGet') | finish | endif
36
37fun! <SID>XmlIndentWithPattern(line, pat)
38    let s = substitute('x'.a:line, a:pat, "\1", 'g')
39    return strlen(substitute(s, "[^\1].*$", '', ''))
40endfun
41
42" [-- check if it's xml --]
43fun! <SID>XmlIndentSynCheck(lnum)
44    if '' != &syntax
45	let syn1 = synIDattr(synID(a:lnum, 1, 1), 'name')
46	let syn2 = synIDattr(synID(a:lnum, strlen(getline(a:lnum)) - 1, 1), 'name')
47	if '' != syn1 && syn1 !~ 'xml' && '' != syn2 && syn2 !~ 'xml'
48	    " don't indent pure non-xml code
49	    return 0
50	elseif syn1 =~ '^xmlComment' && syn2 =~ '^xmlComment'
51	    " indent comments specially
52	    return -1
53	endif
54    endif
55    return 1
56endfun
57
58" [-- return the sum of indents of a:lnum --]
59fun! <SID>XmlIndentSum(lnum, style, add)
60    let line = getline(a:lnum)
61    if a:style == match(line, '^\s*</')
62	return (&sw *
63	\  (<SID>XmlIndentWithPattern(line, b:xml_indent_open)
64	\ - <SID>XmlIndentWithPattern(line, b:xml_indent_close)
65	\ - <SID>XmlIndentWithPattern(line, '.\{-}/>'))) + a:add
66    else
67	return a:add
68    endif
69endfun
70
71fun! XmlIndentGet(lnum, use_syntax_check)
72    " Find a non-empty line above the current line.
73    let lnum = prevnonblank(a:lnum - 1)
74
75    " Hit the start of the file, use zero indent.
76    if lnum == 0
77	return 0
78    endif
79
80    if a:use_syntax_check
81	let check_lnum = <SID>XmlIndentSynCheck(lnum)
82	let check_alnum = <SID>XmlIndentSynCheck(a:lnum)
83	if 0 == check_lnum || 0 == check_alnum
84	    return indent(a:lnum)
85	elseif -1 == check_lnum || -1 == check_alnum
86	    return -1
87	endif
88    endif
89
90    let ind = <SID>XmlIndentSum(lnum, -1, indent(lnum))
91    let ind = <SID>XmlIndentSum(a:lnum, 0, ind)
92
93    return ind
94endfun
95
96" vim:ts=8
97