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Current File : /proc/3/root/usr/share/vim/vim90/indent/matlab.vim
" Vim indent file
" Language: MATLAB
" Maintainer: Axel Forsman <axelsfor@gmail.com>
" Previous maintainer: Christophe Poucet <christophe.poucet@pandora.be>
" Last Update: 2021-10-01

" Only load if no other indent file is loaded
if exists('b:did_indent') | finish | endif
let b:did_indent = 1

setlocal indentexpr=GetMatlabIndent()
setlocal indentkeys=!,o,O,e,0=end,0=elseif,0=case,0=otherwise,0=catch,0=function,0=elsei
let b:undo_indent = "setlocal indentexpr< indentkeys<"

" The value of the Function indenting format in
" MATLAB Editor/Debugger Language Preferences.
" The possible values are 0 for Classic, 1 for Indent nested functions
" and 2 for Indent all functions (default).
let b:MATLAB_function_indent = get(g:, 'MATLAB_function_indent', 2)
" The previous value of b:changedtick
let b:MATLAB_lasttick = -1
" The previously indented line
let b:MATLAB_lastline = -1
" Whether the line above was a line continuation
let b:MATLAB_waslc = 0
let b:MATLAB_bracketlevel = 0

" Only define the function once
if exists("*GetMatlabIndent") | finish | endif

let s:keepcpo = &cpo
set cpo&vim

let s:end = '\<end\>\%([^({]*[)}]\)\@!' " Array indexing heuristic
let s:open_pat = 'for\|if\|parfor\|spmd\|switch\|try\|while\|classdef\|properties\|methods\|events\|enumeration'
let s:dedent_pat = '\C^\s*\zs\<\%(end\|else\|elseif\|catch\|\(case\|otherwise\|function\)\)\>'
let s:start_pat = '\C\<\%(function\|' . s:open_pat . '\)\>'
let s:bracket_pair_pat = '\(\[\|{\)\|\(\]\|}\)'
let s:zflag = has('patch-7.4.984') ? 'z' : ''

" Returns whether a comment or string envelops the specified column.
function! s:IsCommentOrString(lnum, col)
	return synIDattr(synID(a:lnum, a:col, 1), "name") =~# 'matlabComment\|matlabMultilineComment\|matlabCellComment\|matlabString'
endfunction

" Returns whether the specified line continues on the next line.
function! s:IsLineContinuation(lnum)
	let l = getline(a:lnum) | let c = -3
	while 1
		let c = match(l, '\.\{3}', c + 3)
		if c == -1 | return 0
		elseif !s:IsCommentOrString(a:lnum, c) | return 1 | endif
	endwhile
endfunction

function! s:SubmatchCount(lnum, pattern, ...)
	let endcol = a:0 >= 1 ? a:1 : 1 / 0 | let x = [0, 0, 0, 0]
	call cursor(a:lnum, 1)
	while 1
		let [lnum, c, submatch] = searchpos(a:pattern, 'cpe' . s:zflag, a:lnum)
		if !submatch || c >= endcol | break | endif
		if !s:IsCommentOrString(lnum, c) | let x[submatch - 2] += 1 | endif
		if cursor(0, c + 1) == -1 || col('.') == c | break | endif
	endwhile
	return x
endfunction

function! s:GetOpenCloseCount(lnum, pattern, ...)
	let counts = call('s:SubmatchCount', [a:lnum, a:pattern] + a:000)
	return counts[0] - counts[1]
endfunction

function! GetMatlabIndent()
	let prevlnum = prevnonblank(v:lnum - 1)

	if b:MATLAB_lasttick != b:changedtick || b:MATLAB_lastline != prevlnum
		" Recalculate bracket count (only have to check same block and line above)
		let b:MATLAB_bracketlevel = 0
		let previndent = indent(prevlnum) | let l = prevlnum
		while 1
			let l = prevnonblank(l - 1) | let indent = indent(l)
			if l <= 0 || previndent < indent | break | endif
			let b:MATLAB_bracketlevel += s:GetOpenCloseCount(l, s:bracket_pair_pat)
			if previndent != indent | break | endif
		endwhile

		let b:MATLAB_waslc = s:IsLineContinuation(prevlnum - 1)
	endif
	" If line above was blank it can impossibly have been a LC
	let above_lc = b:MATLAB_lasttick == b:changedtick && prevlnum != v:lnum - 1 && b:MATLAB_lastline == prevlnum ? 0 : s:IsLineContinuation(v:lnum - 1)

	let pair_pat = '\C\<\(' . s:open_pat . '\|'
				\ . (b:MATLAB_function_indent == 1 ? '^\@<!' : '')
				\ . (b:MATLAB_function_indent >= 1 ? 'function\|' : '')
				\ . '\|\%(^\s*\)\@<=\%(else\|elseif\|case\|otherwise\|catch\)\)\>'
				\ . '\|\S\s*\zs\(' . s:end . '\)'
	let [open, close, b_open, b_close] = prevlnum ? s:SubmatchCount(prevlnum,
				\ pair_pat . '\|' . s:bracket_pair_pat) : [0, 0, 0, 0]
	let curbracketlevel = b:MATLAB_bracketlevel + b_open - b_close

	call cursor(v:lnum, 1)
	let submatch = search(s:dedent_pat, 'cp' . s:zflag, v:lnum)
	if submatch && !s:IsCommentOrString(v:lnum, col('.'))
		" Align end, et cetera with start of block
		let [lnum, col] = searchpairpos(s:start_pat, '',  '\C' . s:end, 'bW', 's:IsCommentOrString(line("."), col("."))')
		let result = lnum ? indent(lnum) + shiftwidth() * (s:GetOpenCloseCount(lnum, pair_pat, col) + submatch == 2) : 0
	else
		" Count how many blocks the previous line opens/closes
		" Line continuations/brackets indent once per statement
		let result = (prevlnum > 0) * indent(prevlnum) + shiftwidth() * (open - close
					\ + (b:MATLAB_bracketlevel ? -!curbracketlevel : !!curbracketlevel)
					\ + (curbracketlevel <= 0) * (above_lc - b:MATLAB_waslc))
	endif

	let b:MATLAB_waslc = above_lc
	let b:MATLAB_bracketlevel = curbracketlevel
	let b:MATLAB_lasttick = b:changedtick
	let b:MATLAB_lastline = v:lnum
	return result
endfunction

let &cpo = s:keepcpo
unlet s:keepcpo

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