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" Vim indent file
" Language: JSON
" Mantainer: Eli Parra <eli@elzr.com> https://github.com/elzr/vim-json
" Last Change: 2020 Aug 30
" https://github.com/jakar/vim-json/commit/20b650e22aa750c4ab6a66aa646bdd95d7cd548a#diff-e81fc111b2052e306d126bd9989f7b7c
" Original Author: Rogerz Zhang <rogerz.zhang at gmail.com> http://github.com/rogerz/vim-json
" Acknowledgement: Based off of vim-javascript maintained by Darrick Wiebe
" http://www.vim.org/scripts/script.php?script_id=2765
" 0. Initialization {{{1
" =================
" Only load this indent file when no other was loaded.
if exists("b:did_indent")
finish
endif
let b:did_indent = 1
setlocal nosmartindent
" Now, set up our indentation expression and keys that trigger it.
setlocal indentexpr=GetJSONIndent(v:lnum)
setlocal indentkeys=0{,0},0),0[,0],!^F,o,O,e
" Only define the function once.
if exists("*GetJSONIndent")
finish
endif
let s:cpo_save = &cpo
set cpo&vim
" 1. Variables {{{1
" ============
let s:line_term = '\s*\%(\%(\/\/\).*\)\=$'
" Regex that defines blocks.
let s:block_regex = '\%({\)\s*\%(|\%([*@]\=\h\w*,\=\s*\)\%(,\s*[*@]\=\h\w*\)*|\)\=' . s:line_term
" 2. Auxiliary Functions {{{1
" ======================
" Check if the character at lnum:col is inside a string.
function s:IsInString(lnum, col)
return synIDattr(synID(a:lnum, a:col, 1), 'name') == 'jsonString'
endfunction
" Find line above 'lnum' that isn't empty, or in a string.
function s:PrevNonBlankNonString(lnum)
let lnum = prevnonblank(a:lnum)
while lnum > 0
" If the line isn't empty or in a string, end search.
let line = getline(lnum)
if !(s:IsInString(lnum, 1) && s:IsInString(lnum, strlen(line)))
break
endif
let lnum = prevnonblank(lnum - 1)
endwhile
return lnum
endfunction
" Check if line 'lnum' has more opening brackets than closing ones.
function s:LineHasOpeningBrackets(lnum)
let open_0 = 0
let open_2 = 0
let open_4 = 0
let line = getline(a:lnum)
let pos = match(line, '[][(){}]', 0)
while pos != -1
let idx = stridx('(){}[]', line[pos])
if idx % 2 == 0
let open_{idx} = open_{idx} + 1
else
let open_{idx - 1} = open_{idx - 1} - 1
endif
let pos = match(line, '[][(){}]', pos + 1)
endwhile
return (open_0 > 0) . (open_2 > 0) . (open_4 > 0)
endfunction
function s:Match(lnum, regex)
let col = match(getline(a:lnum), a:regex) + 1
return col > 0 && !s:IsInString(a:lnum, col) ? col : 0
endfunction
" 3. GetJSONIndent Function {{{1
" =========================
function GetJSONIndent(...)
" 3.1. Setup {{{2
" ----------
" For the current line, use the first argument if given, else v:lnum
let clnum = a:0 ? a:1 : v:lnum
" Set up variables for restoring position in file. Could use clnum here.
let vcol = col('.')
" 3.2. Work on the current line {{{2
" -----------------------------
" Get the current line.
let line = getline(clnum)
let ind = -1
" If we got a closing bracket on an empty line, find its match and indent
" according to it.
let col = matchend(line, '^\s*[]}]')
if col > 0 && !s:IsInString(clnum, col)
call cursor(clnum, col)
let bs = strpart('{}[]', stridx('}]', line[col - 1]) * 2, 2)
let pairstart = escape(bs[0], '[')
let pairend = escape(bs[1], ']')
let pairline = searchpair(pairstart, '', pairend, 'bW')
if pairline > 0
let ind = indent(pairline)
else
let ind = virtcol('.') - 1
endif
return ind
endif
" If we are in a multi-line string, don't do anything to it.
if s:IsInString(clnum, matchend(line, '^\s*') + 1)
return indent('.')
endif
" 3.3. Work on the previous line. {{{2
" -------------------------------
let lnum = prevnonblank(clnum - 1)
if lnum == 0
return 0
endif
" Set up variables for current line.
let line = getline(lnum)
let ind = indent(lnum)
" If the previous line ended with a block opening, add a level of indent.
" if s:Match(lnum, s:block_regex)
" return indent(lnum) + shiftwidth()
" endif
" If the previous line contained an opening bracket, and we are still in it,
" add indent depending on the bracket type.
if line =~ '[[({]'
let counts = s:LineHasOpeningBrackets(lnum)
if counts[0] == '1' || counts[1] == '1' || counts[2] == '1'
return ind + shiftwidth()
else
call cursor(clnum, vcol)
end
endif
" }}}2
return ind
endfunction
" }}}1
let &cpo = s:cpo_save
unlet s:cpo_save
" vim:set sw=2 sts=2 ts=8 noet: