" Vim indent file
" Language: R
" Author: Jakson Alves de Aquino <jalvesaq@gmail.com>
" Homepage: https://github.com/jalvesaq/R-Vim-runtime
" Last Change: Thu Feb 18, 2016 06:32AM
" Only load this indent file when no other was loaded.
if exists("b:did_indent")
finish
endif
let b:did_indent = 1
setlocal indentkeys=0{,0},:,!^F,o,O,e
setlocal indentexpr=GetRIndent()
" Only define the function once.
if exists("*GetRIndent")
finish
endif
" Options to make the indentation more similar to Emacs/ESS:
if !exists("g:r_indent_align_args")
let g:r_indent_align_args = 1
endif
if !exists("g:r_indent_ess_comments")
let g:r_indent_ess_comments = 0
endif
if !exists("g:r_indent_comment_column")
let g:r_indent_comment_column = 40
endif
if ! exists("g:r_indent_ess_compatible")
let g:r_indent_ess_compatible = 0
endif
if ! exists("g:r_indent_op_pattern")
let g:r_indent_op_pattern = '\(&\||\|+\|-\|\*\|/\|=\|\~\|%\|->\)\s*$'
endif
function s:RDelete_quotes(line)
let i = 0
let j = 0
let line1 = ""
let llen = strlen(a:line)
while i < llen
if a:line[i] == '"'
let i += 1
let line1 = line1 . 's'
while !(a:line[i] == '"' && ((i > 1 && a:line[i-1] == '\' && a:line[i-2] == '\') || a:line[i-1] != '\')) && i < llen
let i += 1
endwhile
if a:line[i] == '"'
let i += 1
endif
else
if a:line[i] == "'"
let i += 1
let line1 = line1 . 's'
while !(a:line[i] == "'" && ((i > 1 && a:line[i-1] == '\' && a:line[i-2] == '\') || a:line[i-1] != '\')) && i < llen
let i += 1
endwhile
if a:line[i] == "'"
let i += 1
endif
else
if a:line[i] == "`"
let i += 1
let line1 = line1 . 's'
while a:line[i] != "`" && i < llen
let i += 1
endwhile
if a:line[i] == "`"
let i += 1
endif
endif
endif
endif
if i == llen
break
endif
let line1 = line1 . a:line[i]
let j += 1
let i += 1
endwhile
return line1
endfunction
" Convert foo(bar()) int foo()
function s:RDelete_parens(line)
if s:Get_paren_balance(a:line, "(", ")") != 0
return a:line
endif
let i = 0
let j = 0
let line1 = ""
let llen = strlen(a:line)
while i < llen
let line1 = line1 . a:line[i]
if a:line[i] == '('
let nop = 1
while nop > 0 && i < llen
let i += 1
if a:line[i] == ')'
let nop -= 1
else
if a:line[i] == '('
let nop += 1
endif
endif
endwhile
let line1 = line1 . a:line[i]
endif
let i += 1
endwhile
return line1
endfunction
function! s:Get_paren_balance(line, o, c)
let line2 = substitute(a:line, a:o, "", "g")
let openp = strlen(a:line) - strlen(line2)
let line3 = substitute(line2, a:c, "", "g")
let closep = strlen(line2) - strlen(line3)
return openp - closep
endfunction
function! s:Get_matching_brace(linenr, o, c, delbrace)
let line = SanitizeRLine(getline(a:linenr))
if a:delbrace == 1
let line = substitute(line, '{$', "", "")
endif
let pb = s:Get_paren_balance(line, a:o, a:c)
let i = a:linenr
while pb != 0 && i > 1
let i -= 1
let pb += s:Get_paren_balance(SanitizeRLine(getline(i)), a:o, a:c)
endwhile
return i
endfunction
" This function is buggy because there 'if's without 'else'
" It must be rewritten relying more on indentation
function! s:Get_matching_if(linenr, delif)
let line = SanitizeRLine(getline(a:linenr))
if a:delif
let line = substitute(line, "if", "", "g")
endif
let elsenr = 0
let i = a:linenr
let ifhere = 0
while i > 0
let line2 = substitute(line, '\<else\>', "xxx", "g")
let elsenr += strlen(line) - strlen(line2)
if line =~ '.*\s*if\s*()' || line =~ '.*\s*if\s*()'
let elsenr -= 1
if elsenr == 0
let ifhere = i
break
endif
endif
let i -= 1
let line = SanitizeRLine(getline(i))
endwhile
if ifhere
return ifhere
else
return a:linenr
endif
endfunction
function! s:Get_last_paren_idx(line, o, c, pb)
let blc = a:pb
let line = substitute(a:line, '\t', s:curtabstop, "g")
let theidx = -1
let llen = strlen(line)
let idx = 0
while idx < llen
if line[idx] == a:o
let blc -= 1
if blc == 0
let theidx = idx
endif
else
if line[idx] == a:c
let blc += 1
endif
endif
let idx += 1
endwhile
return theidx + 1
endfunction
" Get previous relevant line. Search back until getting a line that isn't
" comment or blank
function s:Get_prev_line(lineno)
let lnum = a:lineno - 1
let data = getline( lnum )
while lnum > 0 && (data =~ '^\s*#' || data =~ '^\s*$')
let lnum = lnum - 1
let data = getline( lnum )
endwhile
return lnum
endfunction
" This function is also used by r-plugin/common_global.vim
" Delete from '#' to the end of the line, unless the '#' is inside a string.
function SanitizeRLine(line)
let newline = s:RDelete_quotes(a:line)
let newline = s:RDelete_parens(newline)
let newline = substitute(newline, '#.*', "", "")
let newline = substitute(newline, '\s*$', "", "")
if &filetype == "rhelp" && newline =~ '^\\method{.*}{.*}(.*'
let newline = substitute(newline, '^\\method{\(.*\)}{.*}', '\1', "")
endif
return newline
endfunction
function GetRIndent()
let clnum = line(".") " current line
let cline = getline(clnum)
if cline =~ '^\s*#'
if g:r_indent_ess_comments == 1
if cline =~ '^\s*###'
return 0
endif
if cline !~ '^\s*##'
return g:r_indent_comment_column
endif
endif
endif
let cline = SanitizeRLine(cline)
if cline =~ '^\s*}' || cline =~ '^\s*}\s*)$'
let indline = s:Get_matching_brace(clnum, '{', '}', 1)
if indline > 0 && indline != clnum
let iline = SanitizeRLine(getline(indline))
if s:Get_paren_balance(iline, "(", ")") == 0 || iline =~ '(\s*{$'
return indent(indline)
else
let indline = s:Get_matching_brace(indline, '(', ')', 1)
return indent(indline)
endif
endif
endif
" Find the first non blank line above the current line
let lnum = s:Get_prev_line(clnum)
" Hit the start of the file, use zero indent.
if lnum == 0
return 0
endif
let line = SanitizeRLine(getline(lnum))
if &filetype == "rhelp"
if cline =~ '^\\dontshow{' || cline =~ '^\\dontrun{' || cline =~ '^\\donttest{' || cline =~ '^\\testonly{'
return 0
endif
if line =~ '^\\examples{' || line =~ '^\\usage{' || line =~ '^\\dontshow{' || line =~ '^\\dontrun{' || line =~ '^\\donttest{' || line =~ '^\\testonly{'
return 0
endif
endif
if &filetype == "rnoweb" && line =~ "^<<.*>>="
return 0
endif
if cline =~ '^\s*{' && s:Get_paren_balance(cline, '{', '}') > 0
if g:r_indent_ess_compatible && line =~ ')$'
let nlnum = lnum
let nline = line
while s:Get_paren_balance(nline, '(', ')') < 0
let nlnum = s:Get_prev_line(nlnum)
let nline = SanitizeRLine(getline(nlnum)) . nline
endwhile
if nline =~ '^\s*function\s*(' && indent(nlnum) == shiftwidth()
return 0
endif
endif
if s:Get_paren_balance(line, "(", ")") == 0
return indent(lnum)
endif
endif
" line is an incomplete command:
if line =~ '\<\(if\|while\|for\|function\)\s*()$' || line =~ '\<else$' || line =~ '<-$' || line =~ '->$'
return indent(lnum) + shiftwidth()
endif
" Deal with () and []
let pb = s:Get_paren_balance(line, '(', ')')
if line =~ '^\s*{$' || line =~ '(\s*{' || (pb == 0 && (line =~ '{$' || line =~ '(\s*{$'))
return indent(lnum) + shiftwidth()
endif
let s:curtabstop = repeat(' ', &tabstop)
if g:r_indent_align_args == 1
if pb > 0 && line =~ '{$'
return s:Get_last_paren_idx(line, '(', ')', pb) + shiftwidth()
endif
let bb = s:Get_paren_balance(line, '[', ']')
if pb > 0
if &filetype == "rhelp"
let ind = s:Get_last_paren_idx(line, '(', ')', pb)
else
let ind = s:Get_last_paren_idx(getline(lnum), '(', ')', pb)
endif
return ind
endif
if pb < 0 && line =~ '.*[,&|\-\*+<>]$'
let lnum = s:Get_prev_line(lnum)
while pb < 1 && lnum > 0
let line = SanitizeRLine(getline(lnum))
let line = substitute(line, '\t', s:curtabstop, "g")
let ind = strlen(line)
while ind > 0
if line[ind] == ')'
let pb -= 1
else
if line[ind] == '('
let pb += 1
endif
endif
if pb == 1
return ind + 1
endif
let ind -= 1
endwhile
let lnum -= 1
endwhile
return 0
endif
if bb > 0
let ind = s:Get_last_paren_idx(getline(lnum), '[', ']', bb)
return ind
endif
endif
let post_block = 0
if line =~ '}$' && s:Get_paren_balance(line, '{', '}') < 0
let lnum = s:Get_matching_brace(lnum, '{', '}', 0)
let line = SanitizeRLine(getline(lnum))
if lnum > 0 && line =~ '^\s*{'
let lnum = s:Get_prev_line(lnum)
let line = SanitizeRLine(getline(lnum))
endif
let pb = s:Get_paren_balance(line, '(', ')')
let post_block = 1
endif
" Indent after operator pattern
let olnum = s:Get_prev_line(lnum)
let oline = getline(olnum)
if olnum > 0
if line =~ g:r_indent_op_pattern && s:Get_paren_balance(line, "(", ")") == 0
if oline =~ g:r_indent_op_pattern && s:Get_paren_balance(line, "(", ")") == 0
return indent(lnum)
else
return indent(lnum) + shiftwidth()
endif
else
if oline =~ g:r_indent_op_pattern && s:Get_paren_balance(line, "(", ")") == 0
return indent(lnum) - shiftwidth()
endif
endif
endif
let post_fun = 0
if pb < 0 && line !~ ')\s*[,&|\-\*+<>]$'
let post_fun = 1
while pb < 0 && lnum > 0
let lnum -= 1
let linepiece = SanitizeRLine(getline(lnum))
let pb += s:Get_paren_balance(linepiece, "(", ")")
let line = linepiece . line
endwhile
if line =~ '{$' && post_block == 0
return indent(lnum) + shiftwidth()
endif
" Now we can do some tests again
if cline =~ '^\s*{'
return indent(lnum)
endif
if post_block == 0
let newl = SanitizeRLine(line)
if newl =~ '\<\(if\|while\|for\|function\)\s*()$' || newl =~ '\<else$' || newl =~ '<-$'
return indent(lnum) + shiftwidth()
endif
endif
endif
if cline =~ '^\s*else'
if line =~ '<-\s*if\s*()'
return indent(lnum) + shiftwidth()
else
if line =~ '\<if\s*()'
return indent(lnum)
else
return indent(lnum) - shiftwidth()
endif
endif
endif
let bb = s:Get_paren_balance(line, '[', ']')
if bb < 0 && line =~ '.*]'
while bb < 0 && lnum > 0
let lnum -= 1
let linepiece = SanitizeRLine(getline(lnum))
let bb += s:Get_paren_balance(linepiece, "[", "]")
let line = linepiece . line
endwhile
let line = s:RDelete_parens(line)
endif
let plnum = s:Get_prev_line(lnum)
let ppost_else = 0
if plnum > 0
let pline = SanitizeRLine(getline(plnum))
let ppost_block = 0
if pline =~ '}$'
let ppost_block = 1
let plnum = s:Get_matching_brace(plnum, '{', '}', 0)
let pline = SanitizeRLine(getline(plnum))
if pline =~ '^\s*{$' && plnum > 0
let plnum = s:Get_prev_line(plnum)
let pline = SanitizeRLine(getline(plnum))
endif
endif
if pline =~ 'else$'
let ppost_else = 1
let plnum = s:Get_matching_if(plnum, 0)
let pline = SanitizeRLine(getline(plnum))
endif
if pline =~ '^\s*else\s*if\s*('
let pplnum = s:Get_prev_line(plnum)
let ppline = SanitizeRLine(getline(pplnum))
while ppline =~ '^\s*else\s*if\s*(' || ppline =~ '^\s*if\s*()\s*\S$'
let plnum = pplnum
let pline = ppline
let pplnum = s:Get_prev_line(plnum)
let ppline = SanitizeRLine(getline(pplnum))
endwhile
while ppline =~ '\<\(if\|while\|for\|function\)\s*()$' || ppline =~ '\<else$' || ppline =~ '<-$'
let plnum = pplnum
let pline = ppline
let pplnum = s:Get_prev_line(plnum)
let ppline = SanitizeRLine(getline(pplnum))
endwhile
endif
let ppb = s:Get_paren_balance(pline, '(', ')')
if ppb < 0 && (pline =~ ')\s*{$' || pline =~ ')$')
while ppb < 0 && plnum > 0
let plnum -= 1
let linepiece = SanitizeRLine(getline(plnum))
let ppb += s:Get_paren_balance(linepiece, "(", ")")
let pline = linepiece . pline
endwhile
let pline = s:RDelete_parens(pline)
endif
endif
let ind = indent(lnum)
if g:r_indent_align_args == 0 && pb != 0
let ind += pb * shiftwidth()
return ind
endif
if g:r_indent_align_args == 0 && bb != 0
let ind += bb * shiftwidth()
return ind
endif
if plnum > 0
let pind = indent(plnum)
else
let pind = 0
endif
if ind == pind || (ind == (pind + shiftwidth()) && pline =~ '{$' && ppost_else == 0)
return ind
endif
let pline = getline(plnum)
let pbb = s:Get_paren_balance(pline, '[', ']')
while pind < ind && plnum > 0 && ppb == 0 && pbb == 0
let ind = pind
let plnum = s:Get_prev_line(plnum)
let pline = getline(plnum)
let ppb = s:Get_paren_balance(pline, '(', ')')
let pbb = s:Get_paren_balance(pline, '[', ']')
while pline =~ '^\s*else'
let plnum = s:Get_matching_if(plnum, 1)
let pline = getline(plnum)
let ppb = s:Get_paren_balance(pline, '(', ')')
let pbb = s:Get_paren_balance(pline, '[', ']')
endwhile
let pind = indent(plnum)
if ind == (pind + shiftwidth()) && pline =~ '{$'
return ind
endif
endwhile
return ind
endfunction
" vim: sw=2
