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13912
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1 " Vim plugin for formatting XML
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18456
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2 " Last Change: 2019 Oct 24
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3 " Version: 0.2
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15131
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4 " Author: Christian Brabandt <cb@256bit.org>
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5 " Repository: https://github.com/chrisbra/vim-xml-ftplugin
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6 " License: VIM License
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13912
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7 " Documentation: see :h xmlformat.txt (TODO!)
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8 " ---------------------------------------------------------------------
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9 " Load Once: {{{1
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10 if exists("g:loaded_xmlformat") || &cp
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11 finish
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12 endif
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13 let g:loaded_xmlformat = 1
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14 let s:keepcpo = &cpo
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15 set cpo&vim
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16
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17 " Main function: Format the input {{{1
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18 func! xmlformat#Format()
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19 " only allow reformatting through the gq command
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20 " (e.g. Vim is in normal mode)
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21 if mode() != 'n'
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22 " do not fall back to internal formatting
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23 return 0
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24 endif
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25 let count_orig = v:count
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26 let sw = shiftwidth()
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27 let prev = prevnonblank(v:lnum-1)
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28 let s:indent = indent(prev)/sw
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29 let result = []
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30 let lastitem = prev ? getline(prev) : ''
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31 let is_xml_decl = 0
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32 " go through every line, but don't join all content together and join it
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33 " back. We might lose empty lines
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34 let list = getline(v:lnum, (v:lnum + count_orig - 1))
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35 let current = 0
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36 for line in list
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37 " Keep empty input lines?
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38 if empty(line)
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39 call add(result, '')
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40 continue
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41 elseif line !~# '<[/]\?[^>]*>'
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42 let nextmatch = match(list, '<[/]\?[^>]*>', current)
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43 let line .= join(list[(current + 1):(nextmatch-1)], "\n")
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44 call remove(list, current+1, nextmatch-1)
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45 endif
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46 " split on `>`, but don't split on very first opening <
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47 " this means, items can be like ['<tag>', 'tag content</tag>']
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48 for item in split(line, '.\@<=[>]\zs')
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49 if s:EndTag(item)
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50 let s:indent = s:DecreaseIndent()
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51 call add(result, s:Indent(item))
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52 elseif s:EmptyTag(lastitem)
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53 call add(result, s:Indent(item))
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54 elseif s:StartTag(lastitem) && s:IsTag(item)
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55 let s:indent += 1
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56 call add(result, s:Indent(item))
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57 else
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58 if !s:IsTag(item)
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59 " Simply split on '<', if there is one,
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60 " but reformat according to &textwidth
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61 let t=split(item, '.<\@=\zs')
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62 " t should only contain 2 items, but just be safe here
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63 if s:IsTag(lastitem)
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64 let s:indent+=1
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65 endif
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66 let result+=s:FormatContent([t[0]])
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67 if s:EndTag(t[1])
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68 let s:indent = s:DecreaseIndent()
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69 endif
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70 "for y in t[1:]
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71 let result+=s:FormatContent(t[1:])
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72 "endfor
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73 else
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74 call add(result, s:Indent(item))
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75 endif
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76 endif
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77 let lastitem = item
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78 endfor
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79 let current += 1
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80 endfor
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81
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82 if !empty(result)
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83 let lastprevline = getline(v:lnum + count_orig)
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84 let delete_lastline = v:lnum + count_orig - 1 == line('$')
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85 exe v:lnum. ",". (v:lnum + count_orig - 1). 'd'
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86 call append(v:lnum - 1, result)
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87 " Might need to remove the last line, if it became empty because of the
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88 " append() call
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89 let last = v:lnum + len(result)
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90 " do not use empty(), it returns true for `empty(0)`
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91 if getline(last) is '' && lastprevline is '' && delete_lastline
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92 exe last. 'd'
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93 endif
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94 endif
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95
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96 " do not run internal formatter!
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97 return 0
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98 endfunc
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99 " Check if given tag is XML Declaration header {{{1
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100 func! s:IsXMLDecl(tag)
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101 return a:tag =~? '^\s*<?xml\s\?\%(version="[^"]*"\)\?\s\?\%(encoding="[^"]*"\)\? ?>\s*$'
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102 endfunc
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103 " Return tag indented by current level {{{1
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104 func! s:Indent(item)
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105 return repeat(' ', shiftwidth()*s:indent). s:Trim(a:item)
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106 endfu
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107 " Return item trimmed from leading whitespace {{{1
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108 func! s:Trim(item)
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109 if exists('*trim')
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110 return trim(a:item)
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111 else
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112 return matchstr(a:item, '\S\+.*')
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113 endif
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114 endfunc
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115 " Check if tag is a new opening tag <tag> {{{1
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116 func! s:StartTag(tag)
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117 let is_comment = s:IsComment(a:tag)
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118 return a:tag =~? '^\s*<[^/?]' && !is_comment
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119 endfunc
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120 " Check if tag is a Comment start {{{1
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121 func! s:IsComment(tag)
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122 return a:tag =~? '<!--'
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123 endfunc
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124 " Remove one level of indentation {{{1
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125 func! s:DecreaseIndent()
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126 return (s:indent > 0 ? s:indent - 1 : 0)
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127 endfunc
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128 " Check if tag is a closing tag </tag> {{{1
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129 func! s:EndTag(tag)
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130 return a:tag =~? '^\s*</'
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131 endfunc
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132 " Check that the tag is actually a tag and not {{{1
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133 " something like "foobar</foobar>"
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134 func! s:IsTag(tag)
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135 return s:Trim(a:tag)[0] == '<'
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136 endfunc
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137 " Check if tag is empty <tag/> {{{1
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138 func! s:EmptyTag(tag)
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139 return a:tag =~ '/>\s*$'
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140 endfunc
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141 " Format input line according to textwidth {{{1
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142 func! s:FormatContent(list)
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143 let result=[]
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144 let limit = 80
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145 if &textwidth > 0
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146 let limit = &textwidth
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147 endif
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148 let column=0
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149 let idx = -1
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150 let add_indent = 0
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151 let cnt = 0
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152 for item in a:list
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153 for word in split(item, '\s\+\S\+\zs')
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154 let column += strdisplaywidth(word, column)
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155 if match(word, "^\\s*\n\\+\\s*$") > -1
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156 call add(result, '')
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157 let idx += 1
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158 let column = 0
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159 let add_indent = 1
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160 elseif column > limit || cnt == 0
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161 let add = s:Indent(s:Trim(word))
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162 call add(result, add)
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163 let column = strdisplaywidth(add)
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164 let idx += 1
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165 else
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166 if add_indent
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167 let result[idx] = s:Indent(s:Trim(word))
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168 else
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169 let result[idx] .= ' '. s:Trim(word)
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170 endif
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171 let add_indent = 0
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172 endif
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173 let cnt += 1
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174 endfor
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175 endfor
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176 return result
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177 endfunc
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178 " Restoration And Modelines: {{{1
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179 let &cpo= s:keepcpo
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180 unlet s:keepcpo
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181 " Modeline {{{1
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182 " vim: fdm=marker fdl=0 ts=2 et sw=0 sts=-1
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