174 lines
4.5 KiB
VimL
174 lines
4.5 KiB
VimL
" Vim indent file
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" Language: JSON
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" Maintainer: Eli Parra <eli@elzr.com> https://github.com/elzr/vim-json
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" Last Change: 2020 Aug 30
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" https://github.com/jakar/vim-json/commit/20b650e22aa750c4ab6a66aa646bdd95d7cd548a#diff-e81fc111b2052e306d126bd9989f7b7c
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" 2022 Sep 07: b:undo_indent added by Doug Kearns
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" Original Author: Rogerz Zhang <rogerz.zhang at gmail.com> http://github.com/rogerz/vim-json
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" Acknowledgement: Based off of vim-javascript maintained by Darrick Wiebe
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" http://www.vim.org/scripts/script.php?script_id=2765
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" 0. Initialization {{{1
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" =================
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" Only load this indent file when no other was loaded.
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if exists("b:did_indent")
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finish
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endif
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let b:did_indent = 1
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setlocal nosmartindent
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" Now, set up our indentation expression and keys that trigger it.
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setlocal indentexpr=GetJSONIndent(v:lnum)
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setlocal indentkeys=0{,0},0),0[,0],!^F,o,O,e
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let b:undo_indent = "setl inde< indk< si<"
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" Only define the function once.
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if exists("*GetJSONIndent")
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finish
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endif
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let s:cpo_save = &cpo
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set cpo&vim
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" 1. Variables {{{1
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" ============
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let s:line_term = '\s*\%(\%(\/\/\).*\)\=$'
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" Regex that defines blocks.
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let s:block_regex = '\%({\)\s*\%(|\%([*@]\=\h\w*,\=\s*\)\%(,\s*[*@]\=\h\w*\)*|\)\=' . s:line_term
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" 2. Auxiliary Functions {{{1
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" ======================
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" Check if the character at lnum:col is inside a string.
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function s:IsInString(lnum, col)
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return synIDattr(synID(a:lnum, a:col, 1), 'name') == 'jsonString'
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endfunction
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" Find line above 'lnum' that isn't empty, or in a string.
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function s:PrevNonBlankNonString(lnum)
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let lnum = prevnonblank(a:lnum)
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while lnum > 0
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" If the line isn't empty or in a string, end search.
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let line = getline(lnum)
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if !(s:IsInString(lnum, 1) && s:IsInString(lnum, strlen(line)))
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break
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endif
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let lnum = prevnonblank(lnum - 1)
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endwhile
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return lnum
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endfunction
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" Check if line 'lnum' has more opening brackets than closing ones.
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function s:LineHasOpeningBrackets(lnum)
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let open_0 = 0
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let open_2 = 0
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let open_4 = 0
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let line = getline(a:lnum)
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let pos = match(line, '[][(){}]', 0)
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while pos != -1
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let idx = stridx('(){}[]', line[pos])
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if idx % 2 == 0
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let open_{idx} = open_{idx} + 1
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else
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let open_{idx - 1} = open_{idx - 1} - 1
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endif
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let pos = match(line, '[][(){}]', pos + 1)
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endwhile
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return (open_0 > 0) . (open_2 > 0) . (open_4 > 0)
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endfunction
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function s:Match(lnum, regex)
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let col = match(getline(a:lnum), a:regex) + 1
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return col > 0 && !s:IsInString(a:lnum, col) ? col : 0
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endfunction
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" 3. GetJSONIndent Function {{{1
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" =========================
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function GetJSONIndent(...)
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" 3.1. Setup {{{2
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" ----------
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" For the current line, use the first argument if given, else v:lnum
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let clnum = a:0 ? a:1 : v:lnum
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" Set up variables for restoring position in file. Could use clnum here.
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let vcol = col('.')
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" 3.2. Work on the current line {{{2
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" -----------------------------
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" Get the current line.
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let line = getline(clnum)
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let ind = -1
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" If we got a closing bracket on an empty line, find its match and indent
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" according to it.
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let col = matchend(line, '^\s*[]}]')
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if col > 0 && !s:IsInString(clnum, col)
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call cursor(clnum, col)
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let bs = strpart('{}[]', stridx('}]', line[col - 1]) * 2, 2)
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let pairstart = escape(bs[0], '[')
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let pairend = escape(bs[1], ']')
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let pairline = searchpair(pairstart, '', pairend, 'bW')
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if pairline > 0
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let ind = indent(pairline)
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else
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let ind = virtcol('.') - 1
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endif
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return ind
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endif
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" If we are in a multi-line string, don't do anything to it.
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if s:IsInString(clnum, matchend(line, '^\s*') + 1)
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return indent('.')
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endif
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" 3.3. Work on the previous line. {{{2
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" -------------------------------
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let lnum = prevnonblank(clnum - 1)
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if lnum == 0
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return 0
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endif
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" Set up variables for current line.
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let line = getline(lnum)
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let ind = indent(lnum)
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" If the previous line ended with a block opening, add a level of indent.
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" if s:Match(lnum, s:block_regex)
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" return indent(lnum) + shiftwidth()
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" endif
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" If the previous line contained an opening bracket, and we are still in it,
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" add indent depending on the bracket type.
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if line =~ '[[({]'
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let counts = s:LineHasOpeningBrackets(lnum)
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if counts[0] == '1' || counts[1] == '1' || counts[2] == '1'
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return ind + shiftwidth()
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else
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call cursor(clnum, vcol)
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end
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endif
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" }}}2
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return ind
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endfunction
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" }}}1
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let &cpo = s:cpo_save
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unlet s:cpo_save
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" vim:set sw=2 sts=2 ts=8 noet:
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