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" Vim plugin for formatting XML
" Last Change: 2020 Jan 06
" Version: 0.3
" Author: Christian Brabandt <cb@256bit.org>
" Repository: https://github.com/chrisbra/vim-xml-ftplugin
" License: VIM License
" Documentation: see :h xmlformat.txt (TODO!)
" ---------------------------------------------------------------------
" Load Once: {{{1
if exists("g:loaded_xmlformat") || &cp
finish
endif
let g:loaded_xmlformat = 1
let s:keepcpo = &cpo
set cpo&vim
" Main function: Format the input {{{1
func! xmlformat#Format() abort
" only allow reformatting through the gq command
" (e.g. Vim is in normal mode)
if mode() != 'n'
" do not fall back to internal formatting
return 0
endif
let count_orig = v:count
let sw = shiftwidth()
let prev = prevnonblank(v:lnum-1)
let s:indent = indent(prev)/sw
let result = []
let lastitem = prev ? getline(prev) : ''
let is_xml_decl = 0
" go through every line, but don't join all content together and join it
" back. We might lose empty lines
let list = getline(v:lnum, (v:lnum + count_orig - 1))
let current = 0
for line in list
" Keep empty input lines?
if empty(line)
call add(result, '')
continue
elseif line !~# '<[/]\?[^>]*>'
let nextmatch = match(list, '<[/]\?[^>]*>', current)
if nextmatch > -1
let line .= ' '. join(list[(current + 1):(nextmatch-1)], " ")
call remove(list, current+1, nextmatch-1)
endif
endif
" split on `>`, but don't split on very first opening <
" this means, items can be like ['<tag>', 'tag content</tag>']
for item in split(line, '.\@<=[>]\zs')
if s:EndTag(item)
call s:DecreaseIndent()
call add(result, s:Indent(item))
elseif s:EmptyTag(lastitem)
call add(result, s:Indent(item))
elseif s:StartTag(lastitem) && s:IsTag(item)
let s:indent += 1
call add(result, s:Indent(item))
else
if !s:IsTag(item)
" Simply split on '<', if there is one,
" but reformat according to &textwidth
let t=split(item, '.<\@=\zs')
" if the content fits well within a single line, add it there
" so that the output looks like this:
"
" <foobar>1</foobar>
if s:TagContent(lastitem) is# s:TagContent(t[1]) && strlen(result[-1]) + strlen(item) <= s:Textwidth()
let result[-1] .= item
let lastitem = t[1]
continue
endif
" t should only contain 2 items, but just be safe here
if s:IsTag(lastitem)
let s:indent+=1
endif
let result+=s:FormatContent([t[0]])
if s:EndTag(t[1])
call s:DecreaseIndent()
endif
"for y in t[1:]
let result+=s:FormatContent(t[1:])
"endfor
else
call add(result, s:Indent(item))
endif
endif
let lastitem = item
endfor
let current += 1
endfor
if !empty(result)
let lastprevline = getline(v:lnum + count_orig)
let delete_lastline = v:lnum + count_orig - 1 == line('$')
exe v:lnum. ",". (v:lnum + count_orig - 1). 'd'
call append(v:lnum - 1, result)
" Might need to remove the last line, if it became empty because of the
" append() call
let last = v:lnum + len(result)
" do not use empty(), it returns true for `empty(0)`
if getline(last) is '' && lastprevline is '' && delete_lastline
exe last. 'd'
endif
endif
" do not run internal formatter!
return 0
endfunc
" Check if given tag is XML Declaration header {{{1
func! s:IsXMLDecl(tag) abort
return a:tag =~? '^\s*<?xml\s\?\%(version="[^"]*"\)\?\s\?\%(encoding="[^"]*"\)\? ?>\s*$'
endfunc
" Return tag indented by current level {{{1
func! s:Indent(item) abort
return repeat(' ', shiftwidth()*s:indent). s:Trim(a:item)
endfu
" Return item trimmed from leading whitespace {{{1
func! s:Trim(item) abort
if exists('*trim')
return trim(a:item)
else
return matchstr(a:item, '\S\+.*')
endif
endfunc
" Check if tag is a new opening tag <tag> {{{1
func! s:StartTag(tag) abort
let is_comment = s:IsComment(a:tag)
return a:tag =~? '^\s*<[^/?]' && !is_comment
endfunc
" Check if tag is a Comment start {{{1
func! s:IsComment(tag) abort
return a:tag =~? '<!--'
endfunc
" Remove one level of indentation {{{1
func! s:DecreaseIndent() abort
let s:indent = (s:indent > 0 ? s:indent - 1 : 0)
endfunc
" Check if tag is a closing tag </tag> {{{1
func! s:EndTag(tag) abort
return a:tag =~? '^\s*</'
endfunc
" Check that the tag is actually a tag and not {{{1
" something like "foobar</foobar>"
func! s:IsTag(tag) abort
return s:Trim(a:tag)[0] == '<'
endfunc
" Check if tag is empty <tag/> {{{1
func! s:EmptyTag(tag) abort
return a:tag =~ '/>\s*$'
endfunc
func! s:TagContent(tag) abort "{{{1
" Return content of a tag
return substitute(a:tag, '^\s*<[/]\?\([^>]*\)>\s*$', '\1', '')
endfunc
func! s:Textwidth() abort "{{{1
" return textwidth (or 80 if not set)
return &textwidth == 0 ? 80 : &textwidth
endfunc
" Format input line according to textwidth {{{1
func! s:FormatContent(list) abort
let result=[]
let limit = s:Textwidth()
let column=0
let idx = -1
let add_indent = 0
let cnt = 0
for item in a:list
for word in split(item, '\s\+\S\+\zs')
if match(word, '^\s\+$') > -1
" skip empty words
continue
endif
let column += strdisplaywidth(word, column)
if match(word, "^\\s*\n\\+\\s*$") > -1
call add(result, '')
let idx += 1
let column = 0
let add_indent = 1
elseif column > limit || cnt == 0
let add = s:Indent(s:Trim(word))
call add(result, add)
let column = strdisplaywidth(add)
let idx += 1
else
if add_indent
let result[idx] = s:Indent(s:Trim(word))
else
let result[idx] .= ' '. s:Trim(word)
endif
let add_indent = 0
endif
let cnt += 1
endfor
endfor
return result
endfunc
" Restoration And Modelines: {{{1
let &cpo= s:keepcpo
unlet s:keepcpo
" Modeline {{{1
" vim: fdm=marker fdl=0 ts=2 et sw=0 sts=-1