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| -rw-r--r-- | runtime/indent/json.vim | 173 |
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diff --git a/runtime/indent/json.vim b/runtime/indent/json.vim new file mode 100644 index 0000000..510f7e8 --- /dev/null +++ b/runtime/indent/json.vim @@ -0,0 +1,173 @@ +" Vim indent file +" Language: JSON +" Maintainer: 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 +" 2022 Sep 07: b:undo_indent added by Doug Kearns +" 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 + +let b:undo_indent = "setl inde< indk< si<" + +" 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: |