1" Vim indent file
2" Language: Javascript
3" Maintainer: vim-javascript community
4" URL: https://github.com/pangloss/vim-javascript
5" Last Change: August 12, 2016
6
7" Only load this indent file when no other was loaded.
8if exists('b:did_indent')
9  finish
10endif
11let b:did_indent = 1
12
13" Now, set up our indentation expression and keys that trigger it.
14setlocal indentexpr=GetJavascriptIndent()
15setlocal nolisp
16setlocal indentkeys=0{,0},0),0],:,!^F,o,O,e
17setlocal cinoptions+=j1,J1
18
19let b:undo_indent = 'setlocal indentexpr< indentkeys< cinoptions<'
20
21" Only define the function once.
22if exists('*GetJavascriptIndent')
23  finish
24endif
25
26let s:cpo_save = &cpo
27set cpo&vim
28
29" Get shiftwidth value
30if exists('*shiftwidth')
31  function s:sw()
32    return shiftwidth()
33  endfunction
34else
35  function s:sw()
36    return &sw
37  endfunction
38endif
39
40let s:line_pre = '^\s*\%(\/\*.\{-}\*\/\s*\)*'
41let s:expr_case = s:line_pre . '\%(\%(case\>.\+\)\|default\)\s*:'
42" Regex of syntax group names that are or delimit string or are comments.
43let s:syng_strcom = '\%(s\%(tring\|pecial\)\|comment\|regex\|doc\|template\)'
44
45" Regex of syntax group names that are strings or documentation.
46let s:syng_comment = '\%(comment\|doc\)'
47
48" Expression used to check whether we should skip a match with searchpair().
49let s:skip_expr = "line('.') < (prevnonblank(v:lnum) - 2000) ? dummy : synIDattr(synID(line('.'),col('.'),0),'name') =~? '".s:syng_strcom."'"
50
51function s:lookForParens(start,end,flags,time)
52  if has('reltime')
53    return searchpair(a:start,'',a:end,a:flags,s:skip_expr,0,a:time)
54  else
55    return searchpair(a:start,'',a:end,a:flags,0,0)
56  endif
57endfunction
58
59let s:line_term = '\%(\s*\%(\/\*.\{-}\*\/\s*\)\=\)\@>$'
60
61" configurable regexes that define continuation lines, not including (, {, or [.
62if !exists('g:javascript_opfirst')
63  let g:javascript_opfirst = '\%([<>,:?^%]\|\([-/.+]\)\%(\1\|\*\|\/\)\@!\|\*\/\@!\|=>\@!\||\|&\|in\%(stanceof\)\=\>\)'
64endif
65let g:javascript_opfirst = s:line_pre . g:javascript_opfirst
66
67if !exists('g:javascript_continuation')
68  let g:javascript_continuation = '\%([<*,.?:^%]\|+\@<!+\|-\@<!-\|=\@<!>\|\*\@<!\/\|=\||\|&\|\<in\%(stanceof\)\=\)'
69endif
70let g:javascript_continuation .= s:line_term
71
72function s:Onescope(lnum,text,add)
73  return a:text =~# '\%(\<else\|\<do\|=>' . (a:add ? '\|\<try\|\<finally' : '' ) . '\)' . s:line_term ||
74        \ ((a:add && a:text =~ s:line_pre . '$' && search('\%' . s:PrevCodeLine(a:lnum - 1) . 'l.)' . s:line_term)) ||
75        \ cursor(a:lnum, match(a:text, ')' . s:line_term)) > -1) &&
76        \ s:lookForParens('(', ')', 'cbW', 100) > 0 && search((a:add ?
77        \ '\%(function\*\|[[:lower:][:upper:]_$][[:digit:][:lower:][:upper:]_$]*\)' :
78        \ '\<\%(for\%(\s\+each\)\=\|if\|let\|w\%(hile\|ith\)\)') . '\_s*\%#\C','bW') &&
79        \ (a:add || (expand('<cword>') ==# 'while' ? !s:lookForParens('\<do\>\C', '\<while\>\C','bW',100) : 1))
80endfunction
81
82" Auxiliary Functions {{{2
83
84" strip line of comment
85function s:StripLine(c)
86  return a:c !~# s:expr_case ? substitute(a:c, '\%(:\@<!\/\/.*\)$', '','') : a:c
87endfunction
88
89" Find line above 'lnum' that isn't empty, in a comment, or in a string.
90function s:PrevCodeLine(lnum)
91  let l:lnum = prevnonblank(a:lnum)
92  while l:lnum > 0
93    if synIDattr(synID(l:lnum,matchend(getline(l:lnum), '^\s*[^''"]'),0),'name') !~? s:syng_strcom
94      break
95    endif
96    let l:lnum = prevnonblank(l:lnum - 1)
97  endwhile
98  return l:lnum
99endfunction
100
101" Check if line 'lnum' has a balanced amount of parentheses.
102function s:Balanced(lnum)
103  let open_0 = 0
104  let open_2 = 0
105  let open_4 = 0
106  let l:line = getline(a:lnum)
107  let pos = match(l:line, '[][(){}]', 0)
108  while pos != -1
109    if synIDattr(synID(a:lnum,pos + 1,0),'name') !~? s:syng_strcom
110      let idx = stridx('(){}[]', l:line[pos])
111      if idx % 2 == 0
112        let open_{idx} = open_{idx} + 1
113      else
114        let open_{idx - 1} = open_{idx - 1} - 1
115      endif
116    endif
117    let pos = match(l:line, '[][(){}]', pos + 1)
118  endwhile
119  return (!open_4 + !open_2 + !open_0) - 2
120endfunction
121" }}}
122
123function GetJavascriptIndent()
124  if !exists('b:js_cache')
125    let b:js_cache = [0,0,0]
126  endif
127  " Get the current line.
128  let l:line = getline(v:lnum)
129  let syns = synIDattr(synID(v:lnum, 1, 0), 'name')
130
131  " start with strings,comments,etc.{{{2
132  if (l:line !~ '^[''"`]' && syns =~? 'string\|template') ||
133        \ (l:line !~ '^\s*[/*]' && syns =~? s:syng_comment)
134    return -1
135  endif
136  if l:line !~ '^\%(\/\*\|\s*\/\/\)' && syns =~? s:syng_comment
137    return cindent(v:lnum)
138  endif
139  let l:lnum = s:PrevCodeLine(v:lnum - 1)
140  if l:lnum == 0
141    return 0
142  endif
143
144  if (l:line =~# s:expr_case)
145    let cpo_switch = &cpo
146    set cpo+=%
147    let ind = cindent(v:lnum)
148    let &cpo = cpo_switch
149    return ind
150  endif
151  "}}}
152
153  " the containing paren, bracket, curly. Memoize, last lineNr either has the
154  " same scope or starts a new one, unless if it closed a scope.
155  call cursor(v:lnum,1)
156  if b:js_cache[0] >= l:lnum  && b:js_cache[0] <= v:lnum && b:js_cache[0] &&
157        \ (b:js_cache[0] > l:lnum || s:Balanced(l:lnum) > 0)
158    let num = b:js_cache[1]
159  elseif syns != '' && l:line[0] =~ '\s'
160    let pattern = syns =~? 'block' ? ['{','}'] : syns =~? 'jsparen' ? ['(',')'] :
161          \ syns =~? 'jsbracket'? ['\[','\]'] : ['[({[]','[])}]']
162    let num = s:lookForParens(pattern[0],pattern[1],'bW',2000)
163  else
164    let num = s:lookForParens('[({[]','[])}]','bW',2000)
165  endif
166  let b:js_cache = [v:lnum,num,line('.') == v:lnum ? b:js_cache[2] : col('.')]
167
168  if l:line =~ s:line_pre . '[])}]'
169    return indent(num)
170  endif
171
172  let pline = s:StripLine(getline(l:lnum))
173  let inb = num == 0 ? 1 : (s:Onescope(num, s:StripLine(strpart(getline(num),0,b:js_cache[2] - 1)),1) ||
174        \ (l:line !~ s:line_pre . ',' && pline !~ ',' . s:line_term)) && num < l:lnum
175  let switch_offset = (!inb || num == 0) || expand("<cword>") !=# 'switch' ? 0 : &cino !~ ':' || !has('float') ?  s:sw() :
176        \ float2nr(str2float(matchstr(&cino,'.*:\zs[-0-9.]*')) * (&cino =~# '.*:[^,]*s' ? s:sw() : 1))
177
178  " most significant, find the indent amount
179  if (inb && (l:line =~# g:javascript_opfirst ||
180        \ (pline =~# g:javascript_continuation && pline !~# s:expr_case && (pline !~ ':' . s:line_term || l:line !~#
181        \ s:line_pre . '\%(d\%(o\|ebugger\)\|else\|f\%(or\|inally\)\|if\|let\|switch\|t\%(hrow\|ry\)\|w\%(hile\|ith\)\)\>')))) ||
182        \ (num < l:lnum && s:Onescope(l:lnum,pline,0) && l:line !~ s:line_pre . '{')
183    return (num > 0 ? indent(num) : -s:sw()) + (s:sw() * 2) + switch_offset
184  elseif num > 0
185    return indent(num) + s:sw() + switch_offset
186  endif
187
188endfunction
189
190
191let &cpo = s:cpo_save
192unlet s:cpo_save
193