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Editing: ruby.vim

" Vim indent file
" Language:		Ruby
" Maintainer:		Nikolai Weibull <now at bitwi.se>
" URL:			https://github.com/vim-ruby/vim-ruby
" Release Coordinator:	Doug Kearns <dougkearns@gmail.com>

" 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

if !exists('g:ruby_indent_access_modifier_style')
  " Possible values: "normal", "indent", "outdent"
  let g:ruby_indent_access_modifier_style = 'normal'
endif

if !exists('g:ruby_indent_block_style')
  " Possible values: "expression", "do"
  let g:ruby_indent_block_style = 'expression'
endif

setlocal nosmartindent

" Now, set up our indentation expression and keys that trigger it.
setlocal indentexpr=GetRubyIndent(v:lnum)
setlocal indentkeys=0{,0},0),0],!^F,o,O,e,:,.
setlocal indentkeys+==end,=else,=elsif,=when,=ensure,=rescue,==begin,==end
setlocal indentkeys+==private,=protected,=public

" Only define the function once.
if exists("*GetRubyIndent")
  finish
endif

let s:cpo_save = &cpo
set cpo&vim

" 1. Variables {{{1
" ============

" Regex of syntax group names that are strings.
let s:syng_string =
      \ '\<ruby\%(String\|Interpolation\|NoInterpolation\|StringEscape\)\>'

" Regex of syntax group names that are strings or documentation.
let s:syng_stringdoc =
      \'\<ruby\%(String\|Interpolation\|NoInterpolation\|StringEscape\|Documentation\)\>'

" Expression used to check whether we should skip a match with searchpair().
let s:skip_expr =
      \ "synIDattr(synID(line('.'),col('.'),1),'name') =~ '".s:syng_strcom."'"

" Regex that defines the start-match for the 'end' keyword.
"let s:end_start_regex = '\%(^\|[^.]\)\<\%(module\|class\|def\|if\|for\|while\|until\|case\|unless\|begin\|do\)\>'
" TODO: the do here should be restricted somewhat (only at end of line)?
let s:end_start_regex =
      \ '\C\%(^\s*\|[=,*/%+\-|;{]\|<<\|>>\|:\s\)\s*\zs' .
      \ '\<\%(module\|class\|if\|for\|while\|until\|case\|unless\|begin' .
      \   '\|\%(public\|protected\|private\)\=\s*def\):\@!\>' .
      \ '\|\%(^\|[^.:@$]\)\@<=\<do:\@!\>'

" Regex that defines the end-match for the 'end' keyword.
let s:end_end_regex = '\%(^\|[^.:@$]\)\@<=\<end:\@!\>'

" Expression used for searchpair() call for finding match for 'end' keyword.
let s:end_skip_expr = s:skip_expr .
      \ ' || (expand("<cword>") == "do"' .
      \ ' && getline(".") =~ "^\\s*\\<\$while\\|until\\|for\$:\\@!\\>")'

" Regex that defines continuation lines, not including (, {, or [.
let s:non_bracket_continuation_regex =
      \ '\%([\\.,:*/%+]\|\<and\|\<or\|\%(<%\)\@<![=-]\|:\@<![^[:alnum:]:][|&?]\|||\|&&\)\s*\%(#.*\)\=$'

" Regex that defines continuation lines.
let s:continuation_regex =
      \ '\%(%\@<![({[\\.,:*/%+]\|\<and\|\<or\|\%(<%\)\@<![=-]\|:\@<![^[:alnum:]:][|&?]\|||\|&&\)\s*\%(#.*\)\=$'

" Regex that defines continuable keywords
let s:continuable_regex =
      \ '\C\%(^\s*\|[=,*/%+\-|;{]\|<<\|>>\|:\s\)\s*\zs' .
      \ '\<\%(if\|for\|while\|until\|unless\):\@!\>'

" Regex that defines bracket continuations
let s:bracket_continuation_regex = '%\@<!\%([({[]\)\s*\%(#.*\)\=$'

" Regex that defines dot continuations
let s:dot_continuation_regex = '%\@<!\.\s*\%(#.*\)\=$'

" Regex that defines backslash continuations
let s:backslash_continuation_regex = '%\@<!\\\s*$'

" Regex that defines end of bracket continuation followed by another continuation
let s:bracket_switch_continuation_regex = '^$[^(]\+\zs).\+$\+'.s:continuation_regex

" Regex that defines the first part of a splat pattern
let s:splat_regex = '[[,(]\s*\*\s*\%(#.*\)\=$'

" Regex that describes all indent access modifiers
let s:access_modifier_regex = '\C^\s*\%(public\|protected\|private\)\s*\%(#.*\)\=$'

" Regex that describes the indent access modifiers (excludes public)
let s:indent_access_modifier_regex = '\C^\s*\%(protected\|private\)\s*\%(#.*\)\=$'

" Regex that defines blocks.
"
" Note that there's a slight problem with this regex and s:continuation_regex.
" Code like this will be matched by both:
"
"   method_call do |(a, b)|
"
" The reason is that the pipe matches a hanging "|" operator.
"
let s:block_regex =
      \ '\%(\<do:\@!\>\|%\@<!{\)\s*\%(|[^|]*|\)\=\s*\%(#.*\)\=$'

let s:block_continuation_regex = '^\s*[^])}\t ].*'.s:block_regex

" Regex that describes a leading operator (only a method call's dot for now)
let s:leading_operator_regex = '^\s*[.]'

" 2. Auxiliary Functions {{{1
" ======================

" Check if the character at lnum:col is inside a string, comment, or is ascii.
function s:IsInStringOrComment(lnum, col)
  return synIDattr(synID(a:lnum, a:col, 1), 'name') =~ s:syng_strcom
endfunction

" 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') =~ s:syng_string
endfunction

" Check if the character at lnum:col is inside a string or documentation.
function s:IsInStringOrDocumentation(lnum, col)
  return synIDattr(synID(a:lnum, a:col, 1), 'name') =~ s:syng_stringdoc
endfunction

" Check if the character at lnum:col is inside a string delimiter
function s:IsInStringDelimiter(lnum, col)
  return synIDattr(synID(a:lnum, a:col, 1), 'name') == 'rubyStringDelimiter'
endfunction

" Find line above 'lnum' that isn't empty, in a comment, or in a string.
function s:PrevNonBlankNonString(lnum)
  let in_block = 0
  let lnum = prevnonblank(a:lnum)
  while lnum > 0
    " Go in and out of blocks comments as necessary.
    " If the line isn't empty (with opt. comment) or in a string, end search.
    let line = getline(lnum)
    if line =~ '^=begin'
      if in_block
        let in_block = 0
      else
        break
      endif
    elseif !in_block && line =~ '^=end'
      let in_block = 1
    elseif !in_block && line !~ '^\s*#.*$' && !(s:IsInStringOrComment(lnum, 1)
          \ && s:IsInStringOrComment(lnum, strlen(line)))
      break
    endif
    let lnum = prevnonblank(lnum - 1)
  endwhile
  return lnum
endfunction

" Find line above 'lnum' that started the continuation 'lnum' may be part of.
function s:GetMSL(lnum)
  " Start on the line we're at and use its indent.
  let msl = a:lnum
  let msl_body = getline(msl)
  let lnum = s:PrevNonBlankNonString(a:lnum - 1)
  while lnum > 0
    " If we have a continuation line, or we're in a string, use line as MSL.
    " Otherwise, terminate search as we have found our MSL already.
    let line = getline(lnum)

if !s:Match(msl, s:backslash_continuation_regex) &&
          \ s:Match(lnum, s:backslash_continuation_regex)
      " If the current line doesn't end in a backslash, but the previous one
      " does, look for that line's msl
      "
      " Example:
      "   foo = "bar" \
      "     "baz"
      "
      let msl = lnum
    elseif s:Match(msl, s:leading_operator_regex)
      " If the current line starts with a leading operator, keep its indent
      " and keep looking for an MSL.
      let msl = lnum
    elseif s:Match(lnum, s:splat_regex)
      " If the above line looks like the "*" of a splat, use the current one's
      " indentation.
      "
      " Example:
      "   Hash[*
      "     method_call do
      "       something
      "
      return msl
    elseif s:Match(lnum, s:non_bracket_continuation_regex) &&
          \ s:Match(msl, s:non_bracket_continuation_regex)
      " If the current line is a non-bracket continuation and so is the
      " previous one, keep its indent and continue looking for an MSL.
      "
      " Example:
      "   method_call one,
      "     two,
      "     three
      "
      let msl = lnum
    elseif s:Match(lnum, s:dot_continuation_regex) &&
          \ (s:Match(msl, s:bracket_continuation_regex) || s:Match(msl, s:block_continuation_regex))
      " If the current line is a bracket continuation or a block-starter, but
      " the previous is a dot, keep going to see if the previous line is the
      " start of another continuation.
      "
      " Example:
      "   parent.
      "     method_call {
      "     three
      "
      let msl = lnum
    elseif s:Match(lnum, s:non_bracket_continuation_regex) &&
          \ (s:Match(msl, s:bracket_continuation_regex) || s:Match(msl, s:block_continuation_regex))
      " If the current line is a bracket continuation or a block-starter, but
      " the previous is a non-bracket one, respect the previous' indentation,
      " and stop here.
      "
      " Example:
      "   method_call one,
      "     two {
      "     three
      "
      return lnum
    elseif s:Match(lnum, s:bracket_continuation_regex) &&
          \ (s:Match(msl, s:bracket_continuation_regex) || s:Match(msl, s:block_continuation_regex))
      " If both lines are bracket continuations (the current may also be a
      " block-starter), use the current one's and stop here
      "
      " Example:
      "   method_call(
      "     other_method_call(
      "       foo
      return msl
    elseif s:Match(lnum, s:block_regex) &&
          \ !s:Match(msl, s:continuation_regex) &&
          \ !s:Match(msl, s:block_continuation_regex)
      " If the previous line is a block-starter and the current one is
      " mostly ordinary, use the current one as the MSL.
      "
      " Example:
      "   method_call do
      "     something
      "     something_else
      return msl
    else
      let col = match(line, s:continuation_regex) + 1
      if (col > 0 && !s:IsInStringOrComment(lnum, col))
            \ || s:IsInString(lnum, strlen(line))
        let msl = lnum
      else
        break
      endif
    endif

let msl_body = getline(msl)
    let lnum = s:PrevNonBlankNonString(lnum - 1)
  endwhile
  return msl
endfunction

" Check if line 'lnum' has more opening brackets than closing ones.
function s:ExtraBrackets(lnum)
  let opening = {'parentheses': [], 'braces': [], 'brackets': []}
  let closing = {'parentheses': [], 'braces': [], 'brackets': []}

let line = getline(a:lnum)
  let pos  = match(line, '[][(){}]', 0)

" Save any encountered opening brackets, and remove them once a matching
  " closing one has been found. If a closing bracket shows up that doesn't
  " close anything, save it for later.
  while pos != -1
    if !s:IsInStringOrComment(a:lnum, pos + 1)
      if line[pos] == '('
        call add(opening.parentheses, {'type': '(', 'pos': pos})
      elseif line[pos] == ')'
        if empty(opening.parentheses)
          call add(closing.parentheses, {'type': ')', 'pos': pos})
        else
          let opening.parentheses = opening.parentheses[0:-2]
        endif
      elseif line[pos] == '{'
        call add(opening.braces, {'type': '{', 'pos': pos})
      elseif line[pos] == '}'
        if empty(opening.braces)
          call add(closing.braces, {'type': '}', 'pos': pos})
        else
          let opening.braces = opening.braces[0:-2]
        endif
      elseif line[pos] == '['
        call add(opening.brackets, {'type': '[', 'pos': pos})
      elseif line[pos] == ']'
        if empty(opening.brackets)
          call add(closing.brackets, {'type': ']', 'pos': pos})
        else
          let opening.brackets = opening.brackets[0:-2]
        endif
      endif
    endif

let pos = match(line, '[][(){}]', pos + 1)
  endwhile

" Find the rightmost brackets, since they're the ones that are important in
  " both opening and closing cases
  let rightmost_opening = {'type': '(', 'pos': -1}
  let rightmost_closing = {'type': ')', 'pos': -1}

for opening in opening.parentheses + opening.braces + opening.brackets
    if opening.pos > rightmost_opening.pos
      let rightmost_opening = opening
    endif
  endfor

for closing in closing.parentheses + closing.braces + closing.brackets
    if closing.pos > rightmost_closing.pos
      let rightmost_closing = closing
    endif
  endfor

return [rightmost_opening, rightmost_closing]
endfunction

function s:Match(lnum, regex)
  let line   = getline(a:lnum)
  let offset = match(line, '\C'.a:regex)
  let col    = offset + 1

while offset > -1 && s:IsInStringOrComment(a:lnum, col)
    let offset = match(line, '\C'.a:regex, offset + 1)
    let col = offset + 1
  endwhile

if offset > -1
    return col
  else
    return 0
  endif
endfunction

" Locates the containing class/module's definition line, ignoring nested classes
" along the way.
"
function! s:FindContainingClass()
  let saved_position = getpos('.')

while searchpair(s:end_start_regex, s:end_middle_regex, s:end_end_regex, 'bW',
        \ s:end_skip_expr) > 0
    if expand('<cword>') =~# '\<class\|module\>'
      let found_lnum = line('.')
      call setpos('.', saved_position)
      return found_lnum
    endif
  endwhile

call setpos('.', saved_position)
  return 0
endfunction

" 3. GetRubyIndent Function {{{1
" =========================

function GetRubyIndent(...)
  " 3.1. Setup {{{2
  " ----------

" The value of a single shift-width
  let sw = shiftwidth()

" 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 this line is an access modifier keyword, align according to the closest
  " class declaration.
  if g:ruby_indent_access_modifier_style == 'indent'
    if s:Match(clnum, s:access_modifier_regex)
      let class_line = s:FindContainingClass()
      if class_line > 0
        return indent(class_line) + sw
      endif
    endif
  elseif g:ruby_indent_access_modifier_style == 'outdent'
    if s:Match(clnum, s:access_modifier_regex)
      let class_line = s:FindContainingClass()
      if class_line > 0
        return indent(class_line)
      endif
    endif
  endif

" If we got a closing bracket on an empty line, find its match and indent
  " according to it.  For parentheses we indent to its column - 1, for the
  " others we indent to the containing line's MSL's level.  Return -1 if fail.
  let col = matchend(line, '^\s*[]})]')
  if col > 0 && !s:IsInStringOrComment(clnum, col)
    call cursor(clnum, col)
    let bs = strpart('(){}[]', stridx(')}]', line[col - 1]) * 2, 2)
    if searchpair(escape(bs[0], '\['), '', bs[1], 'bW', s:skip_expr) > 0
      if line[col-1]==')' && col('.') != col('$') - 1
        let ind = virtcol('.') - 1
      elseif g:ruby_indent_block_style == 'do'
        let ind = indent(line('.'))
      else " g:ruby_indent_block_style == 'expression'
        let ind = indent(s:GetMSL(line('.')))
      endif
    endif
    return ind
  endif

" If we have a =begin or =end set indent to first column.
  if match(line, '^\s*\%(=begin\|=end\)$') != -1
    return 0
  endif

" If we have a deindenting keyword, find its match and indent to its level.
  " TODO: this is messy
  if s:Match(clnum, s:ruby_deindent_keywords)
    call cursor(clnum, 1)
    if searchpair(s:end_start_regex, s:end_middle_regex, s:end_end_regex, 'bW',
          \ s:end_skip_expr) > 0
      let msl  = s:GetMSL(line('.'))
      let line = getline(line('.'))

if strpart(line, 0, col('.') - 1) =~ '=\s*$' &&
            \ strpart(line, col('.') - 1, 2) !~ 'do'
        " assignment to case/begin/etc, on the same line, hanging indent
        let ind = virtcol('.') - 1
      elseif g:ruby_indent_block_style == 'do'
        " align to line of the "do", not to the MSL
        let ind = indent(line('.'))
      elseif getline(msl) =~ '=\s*$#.*$\=$'
        " in the case of assignment to the MSL, align to the starting line,
        " not to the MSL
        let ind = indent(line('.'))
      else
        " align to the MSL
        let ind = indent(msl)
      endif
    endif
    return ind
  endif

" If we are in a multi-line string or line-comment, don't do anything to it.
  if s:IsInStringOrDocumentation(clnum, matchend(line, '^\s*') + 1)
    return indent('.')
  endif

" If we are at the closing delimiter of a "<<" heredoc-style string, set the
  " indent to 0.
  if line =~ '^\k\+\s*$'
        \ && s:IsInStringDelimiter(clnum, 1)
        \ && search('\V<<'.line, 'nbW') > 0
    return 0
  endif

" If the current line starts with a leading operator, add a level of indent.
  if s:Match(clnum, s:leading_operator_regex)
    return indent(s:GetMSL(clnum)) + sw
  endif

" 3.3. Work on the previous line. {{{2
  " -------------------------------

" Find a non-blank, non-multi-line string line above the current line.
  let lnum = s:PrevNonBlankNonString(clnum - 1)

" If the line is empty and inside a string, use the previous line.
  if line =~ '^\s*$' && lnum != prevnonblank(clnum - 1)
    return indent(prevnonblank(clnum))
  endif

" At the start of the file use zero indent.
  if lnum == 0
    return 0
  endif

" Set up variables for the previous line.
  let line = getline(lnum)
  let ind = indent(lnum)

if g:ruby_indent_access_modifier_style == 'indent'
    " If the previous line was a private/protected keyword, add a
    " level of indent.
    if s:Match(lnum, s:indent_access_modifier_regex)
      return indent(lnum) + sw
    endif
  elseif g:ruby_indent_access_modifier_style == 'outdent'
    " If the previous line was a private/protected/public keyword, add
    " a level of indent, since the keyword has been out-dented.
    if s:Match(lnum, s:access_modifier_regex)
      return indent(lnum) + sw
    endif
  endif

if s:Match(lnum, s:continuable_regex) && s:Match(lnum, s:continuation_regex)
    return indent(s:GetMSL(lnum)) + sw + sw
  endif

" If the previous line ended with a block opening, add a level of indent.
  if s:Match(lnum, s:block_regex)
    let msl = s:GetMSL(lnum)

if g:ruby_indent_block_style == 'do'
      " don't align to the msl, align to the "do"
      let ind = indent(lnum) + sw
    elseif getline(msl) =~ '=\s*$#.*$\=$'
      " in the case of assignment to the msl, align to the starting line,
      " not to the msl
      let ind = indent(lnum) + sw
    else
      let ind = indent(msl) + sw
    endif
    return ind
  endif

" If the previous line started with a leading operator, use its MSL's level
  " of indent
  if s:Match(lnum, s:leading_operator_regex)
    return indent(s:GetMSL(lnum))
  endif

" If the previous line ended with the "*" of a splat, add a level of indent
  if line =~ s:splat_regex
    return indent(lnum) + sw
  endif

" If the previous line contained unclosed opening brackets and we are still
  " in them, find the rightmost one and add indent depending on the bracket
  " type.
  "
  " If it contained hanging closing brackets, find the rightmost one, find its
  " match and indent according to that.
  if line =~ '[[({]' || line =~ '[])}]\s*\%(#.*\)\=$'
    let [opening, closing] = s:ExtraBrackets(lnum)

if opening.pos != -1
      if opening.type == '(' && searchpair('(', '', ')', 'bW', s:skip_expr) > 0
        if col('.') + 1 == col('$')
          return ind + sw
        else
          return virtcol('.')
        endif
      else
        let nonspace = matchend(line, '\S', opening.pos + 1) - 1
        return nonspace > 0 ? nonspace : ind + sw
      endif
    elseif closing.pos != -1
      call cursor(lnum, closing.pos + 1)
      normal! %

if s:Match(line('.'), s:ruby_indent_keywords)
        return indent('.') + sw
      else
        return indent(s:GetMSL(line('.')))
      endif
    else
      call cursor(clnum, vcol)
    end
  endif

" If the previous line ended with an "end", match that "end"s beginning's
  " indent.
  let col = s:Match(lnum, '\%(^\|[^.:@$]\)\<end\>\s*\%(#.*\)\=$')
  if col > 0
    call cursor(lnum, col)
    if searchpair(s:end_start_regex, '', s:end_end_regex, 'bW',
          \ s:end_skip_expr) > 0
      let n = line('.')
      let ind = indent('.')
      let msl = s:GetMSL(n)
      if msl != n
        let ind = indent(msl)
      end
      return ind
    endif
  end

let col = s:Match(lnum, s:ruby_indent_keywords)
  if col > 0
    call cursor(lnum, col)
    let ind = virtcol('.') - 1 + sw
    " TODO: make this better (we need to count them) (or, if a searchpair
    " fails, we know that something is lacking an end and thus we indent a
    " level
    if s:Match(lnum, s:end_end_regex)
      let ind = indent('.')
    endif
    return ind
  endif

" 3.4. Work on the MSL line. {{{2
  " --------------------------

" Set up variables to use and search for MSL to the previous line.
  let p_lnum = lnum
  let lnum = s:GetMSL(lnum)

" If the previous line wasn't a MSL.
  if p_lnum != lnum
    " If previous line ends bracket and begins non-bracket continuation decrease indent by 1.
    if s:Match(p_lnum, s:bracket_switch_continuation_regex)
      return ind - 1
    " If previous line is a continuation return its indent.
    " TODO: the || s:IsInString() thing worries me a bit.
    elseif s:Match(p_lnum, s:non_bracket_continuation_regex) || s:IsInString(p_lnum,strlen(line))
      return ind
    endif
  endif

" Set up more variables, now that we know we wasn't continuation bound.
  let line = getline(lnum)
  let msl_ind = indent(lnum)

" If the MSL line had an indenting keyword in it, add a level of indent.
  " TODO: this does not take into account contrived things such as
  " module Foo; class Bar; end
  if s:Match(lnum, s:ruby_indent_keywords)
    let ind = msl_ind + sw
    if s:Match(lnum, s:end_end_regex)
      let ind = ind - sw
    endif
    return ind
  endif

" If the previous line ended with [*+/.,-=], but wasn't a block ending or a
  " closing bracket, indent one extra level.
  if s:Match(lnum, s:non_bracket_continuation_regex) && !s:Match(lnum, '^\s*$[\])}]\|end$')
    if lnum == p_lnum
      let ind = msl_ind + sw
    else
      let ind = msl_ind
    endif
    return ind
  endif

" }}}2

return ind
endfunction

" }}}1

let &cpo = s:cpo_save
unlet s:cpo_save

" vim:set sw=2 sts=2 ts=8 et:

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