" Vim completion script
" Language:	XML
" Maintainer:	Mikolaj Machowski ( mikmach AT wp DOT pl )
" Last Change:	2006 Feb 6

" This function will create Dictionary with users namespace strings and values
" canonical (system) names of data files.  Names should be lowercase,
" descriptive to avoid any future conflicts. For example 'xhtml10s' should be
" name for data of XHTML 1.0 Strict and 'xhtml10t' for XHTML 1.0 Transitional
" User interface will be provided by XMLns command defined ...
" Currently supported canonicals are:
" xhtml10s - XHTML 1.0 Strict
" xsl      - XSL
function! xmlcomplete#CreateConnection(canonical, ...)

	" When only one argument provided treat name as default namespace (without
	" 'prefix:').
	if exists("a:1")
		let users = a:1
	else
		let users = 'DEFAULT'
	endif

	" Source data file. Due to suspected errors in autoload do it with
	" :runtime. 
	" TODO: make it properly (using autoload, that is) later
	exe "runtime autoload/xml/".a:canonical.".vim"

	" Remove all traces of unexisting files to return [] when trying
	" omnicomplete something
	" TODO: give warning about non-existing canonicals - should it be?
	if !exists("g:xmldata_".a:canonical)
		unlet! g:xmldata_connection
		return 0
	endif

	" We need to initialize Dictionary to add key-value pair
	if !exists("g:xmldata_connection")
		let g:xmldata_connection = {}
	endif

	let g:xmldata_connection[users] = a:canonical

endfunction

function! xmlcomplete#CreateEntConnection(...)
	if a:0 > 0
		let g:xmldata_entconnect = a:1
	else
		let g:xmldata_entconnect = 'DEFAULT'
	endif
endfunction

function! xmlcomplete#CompleteTags(findstart, base)
  if a:findstart
    " locate the start of the word
	let curline = line('.')
    let line = getline('.')
    let start = col('.') - 1
	let compl_begin = col('.') - 2

    while start >= 0 && line[start - 1] =~ '\(\k\|[:.-]\)'
		let start -= 1
    endwhile

	if start >= 0 && line[start - 1] =~ '&'
		let b:entitiescompl = 1
		let b:compl_context = ''
		return start
	endif

	let b:compl_context = getline('.')[0:(compl_begin)]
	if b:compl_context !~ '<[^>]*$'
		" Look like we may have broken tag. Check previous lines. Up to
		" 10?
		let i = 1
		while 1
			let context_line = getline(curline-i)
			if context_line =~ '<[^>]*$'
				" Yep, this is this line
				let context_lines = getline(curline-i, curline)
				let b:compl_context = join(context_lines, ' ')
				break
			elseif context_line =~ '>[^<]*$'
				" Normal tag line, no need for completion at all
				let b:compl_context = ''
				break
			endif
			let i += 1
		endwhile
		" Make sure we don't have counter
		unlet! i
	endif
	let b:compl_context = matchstr(b:compl_context, '.*\zs<.*')

	" Make sure we will have only current namespace
	unlet! b:xml_namespace
	let b:xml_namespace = matchstr(b:compl_context, '^<\zs\k*\ze:')
	if b:xml_namespace == ''
		let b:xml_namespace = 'DEFAULT'
	endif

    return start

  else
	" There is no connction of namespace and data file. Abandon action
	if !exists("g:xmldata_connection") || g:xmldata_connection == {}
		return []
	endif
	" Initialize base return lists
    let res = []
    let res2 = []
	" a:base is very short - we need context
	if len(b:compl_context) == 0  && !exists("b:entitiescompl")
		return []
	endif
	let context = matchstr(b:compl_context, '^<\zs.*')
	unlet! b:compl_context

	" Make entities completion
	if exists("b:entitiescompl")
		unlet! b:entitiescompl

		if !exists("g:xmldata_entconnect") || g:xmldata_entconnect == 'DEFAULT'
			let values =  g:xmldata{'_'.g:xmldata_connection['DEFAULT']}['vimxmlentities']
		else
			let values =  g:xmldata{'_'.g:xmldata_entconnect}['vimxmlentities']
		endif

		" Get only lines with entity declarations but throw out
		" parameter-entities - they may be completed in future
		let entdecl = filter(getline(1, "$"), 'v:val =~ "<!ENTITY\\s\\+[^%]"')

		if len(entdecl) > 0
			let intent = map(copy(entdecl), 'matchstr(v:val, "<!ENTITY\\s\\+\\zs\\(\\k\\|[.-:]\\)\\+\\ze")')
			let values = intent + values
		endif

		if len(a:base) == 1
			for m in values
				if m =~ '^'.a:base
					call add(res, m.';')
				endif
			endfor
			return res
		else
			for m in values
				if m =~? '^'.a:base
					call add(res, m.';')
				elseif m =~? a:base
					call add(res2, m.';')
				endif
			endfor

			return res + res2
		endif

	endif
	if context =~ '>'
		" Generally if context contains > it means we are outside of tag and
		" should abandon action
		return []
	endif

    " find tags matching with "a:base"
	" If a:base contains white space it is attribute. 
	" It could be also value of attribute...
	" We have to get first word to offer
	" proper completions
	if context == ''
		let tag = ''
	else
		let tag = split(context)[0]
	endif
	" Get rid of namespace
	let tag = substitute(tag, '^'.b:xml_namespace.':', '', '')


	" Get last word, it should be attr name
	let attr = matchstr(context, '.*\s\zs.*')
	" Possible situations where any prediction would be difficult:
	" 1. Events attributes
	if context =~ '\s'

		" If attr contains =\s*[\"'] we catched value of attribute
		if attr =~ "=\s*[\"']"
			" Let do attribute specific completion
			let attrname = matchstr(attr, '.*\ze\s*=')
			let entered_value = matchstr(attr, ".*=\\s*[\"']\\zs.*")

			if tag =~ '^[?!]'
				" Return nothing if we are inside of ! or ? tag
				return []
			else
				let values = g:xmldata{'_'.g:xmldata_connection[b:xml_namespace]}[tag][1][attrname]
			endif

			if len(values) == 0
				return []
			endif

			" We need special version of sbase
			let attrbase = matchstr(context, ".*[\"']")
			let attrquote = matchstr(attrbase, '.$')

			for m in values
				" This if is needed to not offer all completions as-is
				" alphabetically but sort them. Those beginning with entered
				" part will be as first choices
				if m =~ '^'.entered_value
					call add(res, m . attrquote.' ')
				elseif m =~ entered_value
					call add(res2, m . attrquote.' ')
				endif
			endfor

			return res + res2

		endif

		if tag =~ '?xml'
			" Two possible arguments for <?xml> plus variation
			let attrs = ['encoding', 'version="1.0"', 'version']
		elseif tag =~ '^!'
			" Don't make completion at all
			return []
		else
			let attrs = keys(g:xmldata{'_'.g:xmldata_connection[b:xml_namespace]}[tag][1])
		endif

		for m in sort(attrs)
			if m =~ '^'.attr
				if tag !~ '^[?!]' && len(g:xmldata{'_'.g:xmldata_connection[b:xml_namespace]}[tag][1][m]) > 0 && g:xmldata{'_'.g:xmldata_connection[b:xml_namespace]}[tag][1][m][0] =~ '^BOOL$'
					call add(res, m)
				elseif m =~ '='
					call add(res, m)
				else
					call add(res, m.'="')
				endif
			elseif m =~ attr
				if tag !~ '^[?!]' && len(g:xmldata{'_'.g:xmldata_connection[b:xml_namespace]}[tag][1][m]) > 0 && g:xmldata{'_'.g:xmldata_connection[b:xml_namespace]}[tag][1][m][0] =~ '^BOOL$'
					call add(res, m)
				elseif m =~ '='
					call add(res, m)
				else
					call add(res2, m.'="')
				endif
			endif
		endfor

		return res + res2

	endif
	" Close tag
	let b:unaryTagsStack = "base meta link hr br param img area input col"
	if context =~ '^\/'
		let opentag = xmlcomplete#GetLastOpenTag("b:unaryTagsStack")
		return [opentag.">"]
	endif

	" Complete elements of XML structure
	" TODO: #REQUIRED, #IMPLIED, #FIXED, #PCDATA - but these should be detected like
	" entities - in first run
	" keywords: CDATA, ID, IDREF, IDREFS, ENTITY, ENTITIES, NMTOKEN, NMTOKENS
	" are hardly recognizable but keep it in reserve
	" also: EMPTY ANY SYSTEM PUBLIC DATA
	if context =~ '^!'
		let tags = ['!ELEMENT', '!DOCTYPE', '!ATTLIST', '!ENTITY', '!NOTATION', '![CDATA[', '![INCLUDE[', '![IGNORE[']

		for m in tags
			if m =~ '^'.context
				let m = substitute(m, '^!\[\?', '', '')
				call add(res, m)
			elseif m =~ context
				let m = substitute(m, '^!\[\?', '', '')
				call add(res2, m)
			endif
		endfor

		return res + res2

	endif

	" Complete text declaration
	let g:co = context
	if context =~ '^?'
		let tags = ['?xml']

		for m in tags
			if m =~ '^'.context
				call add(res, substitute(m, '^?', '', ''))
			elseif m =~ context
				call add(res, substitute(m, '^?', '', ''))
			endif
		endfor

		return res + res2

	endif

	" Deal with tag completion.
	let opentag = xmlcomplete#GetLastOpenTag("b:unaryTagsStack")
	let opentag = substitute(opentag, '^\k*:', '', '')
	if opentag == ''
		return []
	endif

	let tags = g:xmldata{'_'.g:xmldata_connection[b:xml_namespace]}[opentag][0]
	let context = substitute(context, '^\k*:', '', '')

	if b:xml_namespace == 'DEFAULT'
		let b:xml_namespace = ''
	else
		let b:xml_namespace .= ':'
	endif

	for m in tags
		if m =~ '^'.context
			call add(res, b:xml_namespace.m)
		elseif m =~ context
			call add(res2, b:xml_namespace.m)
		endif
	endfor

	return res + res2

  endif
endfunction

" MM: This is greatly reduced closetag.vim used with kind permission of Steven
"     Mueller
"     Changes: strip all comments; delete error messages; add checking for
"     namespace
" Author: Steven Mueller <diffusor@ugcs.caltech.edu>
" Last Modified: Tue May 24 13:29:48 PDT 2005 
" Version: 0.9.1

function! xmlcomplete#GetLastOpenTag(unaryTagsStack)
	let linenum=line('.')
	let lineend=col('.') - 1 " start: cursor position
	let first=1              " flag for first line searched
	let b:TagStack=''        " main stack of tags
	let startInComment=s:InComment()

	if exists("b:xml_namespace")
		if b:xml_namespace == 'DEFAULT'
			let tagpat='</\=\(\k\|[.-]\)\+\|/>'
		else
			let tagpat='</\='.b:xml_namespace.':\(\k\|[.-]\)\+\|/>'
		endif
	else
		let tagpat='</\=\(\k\|[.-]\)\+\|/>'
	endif
	while (linenum>0)
		let line=getline(linenum)
		if first
			let line=strpart(line,0,lineend)
		else
			let lineend=strlen(line)
		endif
		let b:lineTagStack=''
		let mpos=0
		let b:TagCol=0
		while (mpos > -1)
			let mpos=matchend(line,tagpat)
			if mpos > -1
				let b:TagCol=b:TagCol+mpos
				let tag=matchstr(line,tagpat)

				if exists('b:closetag_disable_synID') || startInComment==s:InCommentAt(linenum, b:TagCol)
					let b:TagLine=linenum
					call s:Push(matchstr(tag,'[^<>]\+'),'b:lineTagStack')
				endif
				let lineend=lineend-mpos
				let line=strpart(line,mpos,lineend)
			endif
		endwhile
		while (!s:EmptystackP('b:lineTagStack'))
			let tag=s:Pop('b:lineTagStack')
			if match(tag, '^/') == 0		"found end tag
				call s:Push(tag,'b:TagStack')
			elseif s:EmptystackP('b:TagStack') && !s:Instack(tag, a:unaryTagsStack)	"found unclosed tag
				return tag
			else
				let endtag=s:Peekstack('b:TagStack')
				if endtag == '/'.tag || endtag == '/'
					call s:Pop('b:TagStack')	"found a open/close tag pair
				elseif !s:Instack(tag, a:unaryTagsStack) "we have a mismatch error
					return ''
				endif
			endif
		endwhile
		let linenum=linenum-1 | let first=0
	endwhile
return ''
endfunction

function! s:InComment()
	return synIDattr(synID(line('.'), col('.'), 0), 'name') =~ 'Comment\|String'
endfunction

function! s:InCommentAt(line, col)
	return synIDattr(synID(a:line, a:col, 0), 'name') =~ 'Comment\|String'
endfunction

function! s:SetKeywords()
	let g:IsKeywordBak=&iskeyword
	let &iskeyword='33-255'
endfunction

function! s:RestoreKeywords()
	let &iskeyword=g:IsKeywordBak
endfunction

function! s:Push(el, sname)
	if !s:EmptystackP(a:sname)
		exe 'let '.a:sname."=a:el.' '.".a:sname
	else
		exe 'let '.a:sname.'=a:el'
	endif
endfunction

function! s:EmptystackP(sname)
	exe 'let stack='.a:sname
	if match(stack,'^ *$') == 0
		return 1
	else
		return 0
	endif
endfunction

function! s:Instack(el, sname)
	exe 'let stack='.a:sname
	call s:SetKeywords()
	let m=match(stack, '\<'.a:el.'\>')
	call s:RestoreKeywords()
	if m < 0
		return 0
	else
		return 1
	endif
endfunction

function! s:Peekstack(sname)
	call s:SetKeywords()
	exe 'let stack='.a:sname
	let top=matchstr(stack, '\<.\{-1,}\>')
	call s:RestoreKeywords()
	return top
endfunction

function! s:Pop(sname)
	if s:EmptystackP(a:sname)
		return ''
	endif
	exe 'let stack='.a:sname
	call s:SetKeywords()
	let loc=matchend(stack,'\<.\{-1,}\>')
	exe 'let '.a:sname.'=strpart(stack, loc+1, strlen(stack))'
	let top=strpart(stack, match(stack, '\<'), loc)
	call s:RestoreKeywords()
	return top
endfunction

function! s:Clearstack(sname)
	exe 'let '.a:sname."=''"
endfunction