" Vim indent file

" Language: Javascript

" Maintainer: Chris Paul ( https://github.com/bounceme )

" URL: https://github.com/pangloss/vim-javascript

" Last Change: November 6, 2016

" Only load this indent file when no other was loaded.

if exists('b:did_indent')

finish

endif

let b:did_indent = 1

" Now, set up our indentation expression and keys that trigger it.

setlocal indentexpr=GetJavascriptIndent()

setlocal autoindent nolisp nosmartindent

setlocal indentkeys=0{,0},0),0],:,!^F,o,O,e

setlocal cinoptions+=j1,J1

let b:undo_indent = 'setlocal indentexpr< smartindent< autoindent< indentkeys< cinoptions<'

" Only define the function once.

if exists('*GetJavascriptIndent')

finish

endif

let s:cpo_save = &cpo

set cpo&vim

" Get shiftwidth value

if exists('*shiftwidth')

function s:sw()

return shiftwidth()

endfunction

else

function s:sw()

return &sw

endfunction

endif

let s:case_stmt = '\<\%(case\>\s*[^ \t:].*\|default\s*\):\C'

" Regex of syntax group names that are or delimit string or are comments.

let s:syng_strcom = 'string\|comment\|regex\|special\|doc\|template'

" Expression used to check whether we should skip a match with searchpair().

let s:skip_expr = "synIDattr(synID(line('.'),col('.'),0),'name') =~? '".s:syng_strcom."'"

function s:skip_func(lnum)

if !s:free || search('`\|\*\/','nW',a:lnum)

let s:free = !eval(s:skip_expr . " . '\\|html'")

let s:looksyn = s:free ? line('.') : s:looksyn

return !s:free

endif

let s:looksyn = line('.')

return (search('\/','nbW',s:looksyn) || search('[''"\\]','nW',s:looksyn)) && eval(s:skip_expr . " . '\\|html'")

endfunction

if has('reltime')

function s:GetPair(start,end,flags,skip,time,...)

return searchpair(a:start,'',a:end,a:flags,a:skip,max([prevnonblank(v:lnum) - 2000,0] + a:000),a:time)

endfunction

else

function s:GetPair(start,end,flags,skip,...)

return searchpair(a:start,'',a:end,a:flags,a:skip,max([prevnonblank(v:lnum) - 1000,get(a:000,1)]))

endfunction

endif

function s:current_char()

return getline('.')[col('.')-1]

endfunction

function s:token()

return s:current_char() =~ '\k' ? expand('<cword>') : s:current_char()

endfunction

" NOTE: moves the cursor

function s:previous_token()

return search('\<\|[][`^!"%-/:-?{-~]','bW') ? s:token() : ''

endfunction

function s:Trim(ln)

let pline = substitute(getline(a:ln),'\s*$','','')

let l:max = max([strridx(pline,'//'),strridx(pline,'/*'),0])

while l:max && synIDattr(synID(a:ln, strlen(pline), 0), 'name') =~? 'comment\|doc'

let pline = substitute(strpart(pline, 0, l:max),'\s*$','','')

let l:max = max([strridx(pline,'//'),strridx(pline,'/*'),0])

endwhile

return pline

endfunction

" configurable regexes that define continuation lines, not including (, {, or [.

let s:opfirst = '^' . get(g:,'javascript_opfirst',

\ '\%([<>,?^%|*/&]\|\([-.:+]\)\1\@!\|=>\@!\|in\%(stanceof\)\=\>\)')

let s:continuation = get(g:,'javascript_continuation',

\ '\%([<=,.?/*^%|&:]\|+\@<!+\|-\@<!-\|=\@<!>\|\<in\%(stanceof\)\=\)') . '$'

function s:OneScope(lnum,text)

if cursor(a:lnum, match(' ' . a:text, ')$')) + 1 &&

\ s:GetPair('(', ')', 'bW', s:skip_expr, 100) > 0

let token = s:previous_token()

if index(split('await each'),token) + 1

return s:previous_token() ==# 'for'

endif

return index(split('for if let while with'),token) + 1

endif

return cursor(a:lnum, match(' ' . a:text, '\%(\<else\|\<do\|=>\)$\C')) + 1

endfunction

function s:iscontOne(i,num,cont)

let [l:i, l:cont, l:num] = [a:i, a:cont, a:num + !a:num]

let pind = a:num ? indent(l:num) + s:W : 0

let ind = indent(l:i) + (a:cont ? 0 : s:W)

let bL = 0

while l:i >= l:num && (!l:cont || ind > pind)

if indent(l:i) < ind " first line always true for !a:cont, false for !!a:cont

if s:OneScope(l:i,s:Trim(l:i))

let bL += s:W

let [l:cont, l:i] = [0, line('.')]

elseif !l:cont

break

endif

elseif !a:cont

break

endif

let ind = min([ind, indent(l:i)])

let l:i = s:PrevCodeLine(l:i - 1)

endwhile

return bL

endfunction

" https://github.com/sweet-js/sweet.js/wiki/design#give-lookbehind-to-the-reader

function s:IsBlock(...)

let l:ln = get(a:000,0,line('.'))

let char = s:previous_token()

let syn = char =~ '[{>/]' || l:ln != line('.') ? synIDattr(synID(line('.'),col('.')-(char == '{'),0),'name') : ''

if char is '' || syn =~? 'regex'

return 1

elseif syn =~? 'xml\|jsx'

return char != '{'

elseif syn =~? 'comment'

return search('\/[/*]','bW') && s:IsBlock(l:ln)

elseif char == '>'

return getline('.')[col('.')-2] == '=' || syn =~? '^jsflow'

elseif char == ':'

return cursor(0,match(' ' . strpart(getline('.'),0,col('.')),'.*\zs' . s:case_stmt . '$')) + 1 &&

\ (expand('<cword>') !=# 'default' || s:previous_token() !~ '[,{]')

endif

return index(split('return const let import export yield default delete var void typeof throw new in instanceof')

\ + split('-=~!<*+,/?^%|&([','\zs'), char) < (0 + (line('.') != l:ln))

endfunction

" Find line above 'lnum' that isn't empty, in a comment, or in a string.

function s:PrevCodeLine(lnum)

let l:lnum = prevnonblank(a:lnum)

while l:lnum

let syn = synIDattr(synID(l:lnum,matchend(getline(l:lnum), '^\s*[^''"`]'),0),'name')

if syn =~? 'html'

return

elseif syn !~? 'comment\|doc\|string\|template'

return l:lnum

endif

let l:lnum = prevnonblank(l:lnum - 1)

endwhile

endfunction

" Check if line 'lnum' has a balanced amount of parentheses.

function s:Balanced(lnum)

let l:open = 0

let l:line = getline(a:lnum)

let pos = match(l:line, '[][(){}]', 0)

while pos != -1

if synIDattr(synID(a:lnum,pos + 1,0),'name') !~? s:syng_strcom

let l:open += match(' ' . l:line[pos],'[[({]')

if l:open < 0

return

endif

endif

let pos = match(l:line, '[][(){}]', pos + 1)

endwhile

return !l:open

endfunction

function GetJavascriptIndent()

let b:js_cache = get(b:,'js_cache',[0,0,0])

" Get the current line.

let l:line = getline(v:lnum)

let syns = synIDattr(synID(v:lnum, 1, 0), 'name')

" start with strings,comments,etc.

if syns =~? 'comment\|doc'

if l:line =~ '^\s*\*'

return cindent(v:lnum)

elseif l:line !~ '^\s*\/'

return -1

endif

elseif syns =~? 'string\|template' && l:line !~ '^[''"]'

return -1

endif

let l:lnum = s:PrevCodeLine(v:lnum - 1)

if !l:lnum

return

endif

let l:line = substitute(substitute(l:line,'^\s*\%(\/\*.\{-}\*\/\s*\)*','',''),'^\/[/*].*','','')

" the containing paren, bracket, curly. Many hacks for performance

call cursor(v:lnum,1)

let idx = strlen(l:line) ? stridx('])}',l:line[0]) : -1

if indent(l:lnum)

let [s:looksyn,s:free] = [v:lnum - 1,1]

if b:js_cache[0] >= l:lnum && b:js_cache[0] < v:lnum &&

\ (b:js_cache[0] > l:lnum || s:Balanced(l:lnum))

call call('cursor',b:js_cache[1:])

elseif idx + 1

call s:GetPair(['\[','(','{'][idx], '])}'[idx],'bW','s:skip_func(s:looksyn)',2000)

elseif indent(v:lnum) && syns =~? 'block'

call s:GetPair('{','}','bW','s:skip_func(s:looksyn)',2000)

else

call s:GetPair('[({[]','[])}]','bW','s:skip_func(s:looksyn)',2000)

endif

else

call s:GetPair('[({[]','[])}]','bW',s:skip_expr,200,l:lnum)

endif

if idx + 1

if idx == 2 && search('\S','bW',line('.')) && s:current_char() == ')'

call s:GetPair('(',')','bW',s:skip_expr,200)

endif

return indent(line('.'))

endif

let b:js_cache = [v:lnum] + (line('.') == v:lnum ? [0,0] : [line('.'),col('.')])

let num = b:js_cache[1]

let [s:W, pline, isOp, stmt, bL, switch_offset] = [s:sw(), s:Trim(l:lnum),0,0,0,0]

if num && s:current_char() == '{' && s:IsBlock()

let stmt = 1

if s:current_char() == ')' && s:GetPair('(', ')', 'bW', s:skip_expr, 100) > 0 && s:previous_token() ==# 'switch'

let switch_offset = &cino !~ ':' || !has('float') ? s:W :

\ float2nr(str2float(matchstr(&cino,'.*:\zs[-0-9.]*')) * (&cino =~# '\%(.*:\)\@>[^,]*s' ? s:W : 1))

if l:line =~# '^' . s:case_stmt

return indent(num) + switch_offset

endif

let stmt = pline !~# s:case_stmt . '$'

endif

endif

if stmt || !num

let isOp = l:line =~# s:opfirst || pline =~# s:continuation &&

\ synIDattr(synID(l:lnum,match(' ' . pline,'\/$'),0),'name') !~? 'regex'

let bL = s:iscontOne(l:lnum,num,isOp)

let bL -= (bL && l:line[0] == '{') * s:W

endif

" main return

if isOp

return (num ? indent(num) : -s:W) + (s:W * 2) + switch_offset + bL

elseif num

return indent(num) + s:W + switch_offset + bL

endif

return bL

endfunction

let &cpo = s:cpo_save

unlet s:cpo_save