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xml.vim
" Language: XML " Maintainer: Christian Brabandt <cb@256bit.org> " Repository: https://github.com/chrisbra/vim-xml-ftplugin " Previous Maintainer: Johannes Zellner <johannes@zellner.org> " Last Changed: 2020 Nov 4th " Last Change: " 20200529 - Handle empty closing tags correctly " 20191202 - Handle docbk filetype " 20190726 - Correctly handle non-tagged data " 20190204 - correctly handle wrap tags " https://github.com/chrisbra/vim-xml-ftplugin/issues/5 " 20190128 - Make sure to find previous tag " https://github.com/chrisbra/vim-xml-ftplugin/issues/4 " 20181116 - Fix indentation when tags start with a colon or an underscore " https://github.com/vim/vim/pull/926 " 20181022 - Do not overwrite indentkeys setting " https://github.com/chrisbra/vim-xml-ftplugin/issues/1 " 20180724 - Correctly indent xml comments https://github.com/vim/vim/issues/3200 " " Notes: " 1) does not indent pure non-xml code (e.g. embedded scripts) " 2) will be confused by unbalanced tags in comments " or CDATA sections. " 2009-05-26 patch by Nikolai Weibull " TODO: implement pre-like tags, see xml_indent_open / xml_indent_close " Only load this indent file when no other was loaded. if exists("b:did_indent") finish endif let b:did_indent = 1 let s:keepcpo= &cpo set cpo&vim " [-- local settings (must come before aborting the script) --] " Attention: Parameter use_syntax_check is used by the docbk.vim indent script setlocal indentexpr=XmlIndentGet(v:lnum,1) setlocal indentkeys=o,O,*<Return>,<>>,<<>,/,{,},!^F " autoindent: used when the indentexpr returns -1 setlocal autoindent let b:undo_indent = "setl ai< inde< indk<" if !exists('b:xml_indent_open') let b:xml_indent_open = '.\{-}<[:A-Z_a-z]' " pre tag, e.g. <address> " let b:xml_indent_open = '.\{-}<[/]\@!\(address\)\@!' endif if !exists('b:xml_indent_close') let b:xml_indent_close = '.\{-}</\|/>.\{-}' " end pre tag, e.g. </address> " let b:xml_indent_close = '.\{-}</\(address\)\@!' endif if !exists('b:xml_indent_continuation_filetype') let b:xml_indent_continuation_filetype = 'xml' endif let &cpo = s:keepcpo unlet s:keepcpo " [-- finish, if the function already exists --] if exists('*XmlIndentGet') finish endif let s:keepcpo= &cpo set cpo&vim fun! <SID>XmlIndentWithPattern(line, pat) let s = substitute('x'.a:line, a:pat, "\1", 'g') return strlen(substitute(s, "[^\1].*$", '', '')) endfun " [-- check if it's xml --] fun! <SID>XmlIndentSynCheck(lnum) if &syntax != '' let syn1 = synIDattr(synID(a:lnum, 1, 1), 'name') let syn2 = synIDattr(synID(a:lnum, strlen(getline(a:lnum)) - 1, 1), 'name') if syn1 != '' && syn1 !~ 'xml' && syn2 != '' && syn2 !~ 'xml' " don't indent pure non-xml code return 0 endif endif return 1 endfun " [-- return the sum of indents of a:lnum --] fun! <SID>XmlIndentSum(line, style, add) if <SID>IsXMLContinuation(a:line) && a:style == 0 && !<SID>IsXMLEmptyClosingTag(a:line) " no complete tag, add one additional indent level " but only for the current line return a:add + shiftwidth() elseif <SID>HasNoTagEnd(a:line) " no complete tag, return initial indent return a:add endif if a:style == match(a:line, '^\s*</') return (shiftwidth() * \ (<SID>XmlIndentWithPattern(a:line, b:xml_indent_open) \ - <SID>XmlIndentWithPattern(a:line, b:xml_indent_close) \ - <SID>XmlIndentWithPattern(a:line, '.\{-}/>'))) + a:add else return a:add endif endfun " Main indent function fun! XmlIndentGet(lnum, use_syntax_check) " Find a non-empty line above the current line. if prevnonblank(a:lnum - 1) == 0 " Hit the start of the file, use zero indent. return 0 endif " Find previous line with a tag (regardless whether open or closed, " but always restrict the match to a line before the current one " Note: xml declaration: <?xml version="1.0"?> " won't be found, as it is not a legal tag name let ptag_pattern = '\%(.\{-}<[/:A-Z_a-z]\)'. '\%(\&\%<'. a:lnum .'l\)' let ptag = search(ptag_pattern, 'bnW') " no previous tag if ptag == 0 return 0 endif let pline = getline(ptag) let pind = indent(ptag) let syn_name_start = '' " Syntax element at start of line (excluding whitespace) let syn_name_end = '' " Syntax element at end of line let curline = getline(a:lnum) if a:use_syntax_check let check_lnum = <SID>XmlIndentSynCheck(ptag) let check_alnum = <SID>XmlIndentSynCheck(a:lnum) if check_lnum == 0 || check_alnum == 0 return indent(a:lnum) endif let syn_name_end = synIDattr(synID(a:lnum, strlen(curline) - 1, 1), 'name') let syn_name_start = synIDattr(synID(a:lnum, match(curline, '\S') + 1, 1), 'name') let prev_syn_name_end = synIDattr(synID(ptag, strlen(pline) - 1, 1), 'name') " not needed (yet?) " let prev_syn_name_start = synIDattr(synID(ptag, match(pline, '\S') + 1, 1), 'name') endif if syn_name_end =~ 'Comment' && syn_name_start =~ 'Comment' return <SID>XmlIndentComment(a:lnum) elseif empty(syn_name_start) && empty(syn_name_end) && a:use_syntax_check " non-xml tag content: use indent from 'autoindent' if pline =~ b:xml_indent_close return pind elseif !empty(prev_syn_name_end) " only indent by an extra shiftwidth, if the previous line ends " with an XML like tag return pind + shiftwidth() else " no extra indent, looks like a text continuation line return pind endif endif " Get indent from previous tag line let ind = <SID>XmlIndentSum(pline, -1, pind) " Determine indent from current line let ind = <SID>XmlIndentSum(curline, 0, ind) return ind endfun func! <SID>IsXMLContinuation(line) " Checks, whether or not the line matches a start-of-tag return a:line !~ '^\s*<' && &ft =~# b:xml_indent_continuation_filetype endfunc func! <SID>HasNoTagEnd(line) " Checks whether or not the line matches '>' (so finishes a tag) return a:line !~ '>\s*$' endfunc func! <SID>IsXMLEmptyClosingTag(line) " Checks whether the line ends with an empty closing tag such as <lb/> return a:line =~? '<[^>]*/>\s*$' endfunc " return indent for a commented line, " the middle part might be indented one additional level func! <SID>XmlIndentComment(lnum) let ptagopen = search('.\{-}<[:A-Z_a-z]\_[^/]\{-}>.\{-}', 'bnW') let ptagclose = search(b:xml_indent_close, 'bnW') if getline(a:lnum) =~ '<!--' " if previous tag was a closing tag, do not add " one additional level of indent if ptagclose > ptagopen && a:lnum > ptagclose " If the previous tag was closed on the same line as it was " declared, we should indent with its indent level. if !<SID>IsXMLContinuation(getline(ptagclose)) return indent(ptagclose) else return indent(ptagclose) - shiftwidth() endif elseif ptagclose == ptagopen return indent(ptagclose) else " start of comment, add one indentation level return indent(ptagopen) + shiftwidth() endif elseif getline(a:lnum) =~ '-->' " end of comment, same as start of comment return indent(search('<!--', 'bnW')) else " middle part of comment, add one additional level return indent(search('<!--', 'bnW')) + shiftwidth() endif endfunc let &cpo = s:keepcpo unlet s:keepcpo " vim:ts=4 et sts=-1 sw=0