home *** CD-ROM | disk | FTP | other *** search
- " Vim indent file
- " Language: Ruby
- " Maintainer: Nikolai Weibull <now at bitwi.se>
- " Last Change: 2009 Dec 17
- " URL: http://vim-ruby.rubyforge.org
- " Anon CVS: See above site
- " 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
-
- setlocal nosmartindent
-
- " Now, set up our indentation expression and keys that trigger it.
- setlocal indentexpr=GetRubyIndent()
- setlocal indentkeys=0{,0},0),0],!^F,o,O,e
- setlocal indentkeys+==end,=elsif,=when,=ensure,=rescue,==begin,==end
-
- " 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 or delimit string or are comments.
- let s:syng_strcom = '\<ruby\%(String\|StringEscape\|ASCIICode' .
- \ '\|Interpolation\|NoInterpolation\|Comment\|Documentation\)\>'
-
- " 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 used for words that, at the start of a line, add a level of indent.
- let s:ruby_indent_keywords = '^\s*\zs\<\%(module\|class\|def\|if\|for' .
- \ '\|while\|until\|else\|elsif\|case\|when\|unless\|begin\|ensure' .
- \ '\|rescue\)\>' .
- \ '\|\%([*+/,=-]\|<<\|>>\|:\s\)\s*\zs' .
- \ '\<\%(if\|for\|while\|until\|case\|unless\|begin\)\>'
-
- " Regex used for words that, at the start of a line, remove a level of indent.
- let s:ruby_deindent_keywords =
- \ '^\s*\zs\<\%(ensure\|else\|rescue\|elsif\|when\|end\)\>'
-
- " 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 = '^\s*\zs\<\%(module\|class\|def\|if\|for' .
- \ '\|while\|until\|case\|unless\|begin\)\>' .
- \ '\|\%([*+/,=-]\|<<\|>>\|:\s\)\s*\zs' .
- \ '\<\%(if\|for\|while\|until\|case\|unless\|begin\)\>' .
- \ '\|\<do\>'
-
- " Regex that defines the middle-match for the 'end' keyword.
- let s:end_middle_regex = '\<\%(ensure\|else\|\%(\%(^\|;\)\s*\)\@<=\<rescue\>\|when\|elsif\)\>'
-
- " 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:continuation_regex = '\%([\\*+/.,:]\|\%(<%\)\@<![=-]\|\W[|&?]\|||\|&&\)\s*\%(#.*\)\=$'
-
- " Regex that defines continuation lines.
- " TODO: this needs to deal with if ...: and so on
- let s:continuation_regex2 =
- \ '\%([\\*+/.,:({[]\|\%(<%\)\@<![=-]\|\W[|&?]\|||\|&&\)\s*\%(#.*\)\=$'
-
- " Regex that defines blocks.
- let s:block_regex =
- \ '\%(\<do\>\|{\)\s*\%(|\%([*@]\=\h\w*,\=\s*\)\%(,\s*[*@]\=\h\w*\)*|\)\=\s*\%(#.*\)\=$'
-
- " 2. Auxiliary Functions {{{1
- " ======================
-
- " Check if the character at lnum:col is inside a string, comment, or is ascii.
- function s:IsInStringOrComment(lnum, col)
- return synIDattr(synID(a:lnum, a:col, 1), 'name') =~ s:syng_strcom
- endfunction
-
- " Check if the character at lnum:col is inside a string.
- function s:IsInString(lnum, col)
- return synIDattr(synID(a:lnum, a:col, 1), 'name') =~ s:syng_string
- endfunction
-
- " Check if the character at lnum:col is inside a string or documentation.
- function s:IsInStringOrDocumentation(lnum, col)
- return synIDattr(synID(a:lnum, a:col, 1), 'name') =~ s:syng_stringdoc
- endfunction
-
- " Find line above 'lnum' that isn't empty, in a comment, or in a string.
- function s:PrevNonBlankNonString(lnum)
- let in_block = 0
- let lnum = prevnonblank(a:lnum)
- while lnum > 0
- " Go in and out of blocks comments as necessary.
- " If the line isn't empty (with opt. comment) or in a string, end search.
- let line = getline(lnum)
- if line =~ '^=begin$'
- 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 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)
- let col = match(line, s:continuation_regex2) + 1
- if (col > 0 && !s:IsInStringOrComment(lnum, col))
- \ || s:IsInString(lnum, strlen(line))
- let msl = lnum
- else
- break
- endif
- let lnum = s:PrevNonBlankNonString(lnum - 1)
- endwhile
- return msl
- 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
- if !s:IsInStringOrComment(a:lnum, 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
- 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), '\C'.a:regex) + 1
- return col > 0 && !s:IsInStringOrComment(a:lnum, col) ? col : 0
- endfunction
-
- function s:MatchLast(lnum, regex)
- let line = getline(a:lnum)
- let col = match(line, '.*\zs' . a:regex)
- while col != -1 && s:IsInStringOrComment(a:lnum, col)
- let line = strpart(line, 0, col)
- let col = match(line, '.*' . a:regex)
- endwhile
- return col + 1
- endfunction
-
- " 3. GetRubyIndent Function {{{1
- " =========================
-
- function GetRubyIndent()
- " 3.1. Setup {{{2
- " ----------
-
- " Set up variables for restoring position in file. Could use v:lnum here.
- let vcol = col('.')
-
- " 3.2. Work on the current line {{{2
- " -----------------------------
-
- " Get the current line.
- let line = getline(v:lnum)
- let ind = -1
-
- " 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(v:lnum, col)
- call cursor(v:lnum, 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
- else
- 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\)$') != -1
- return 0
- endif
-
- " If we have a deindenting keyword, find its match and indent to its level.
- " TODO: this is messy
- if s:Match(v:lnum, s:ruby_deindent_keywords)
- call cursor(v:lnum, 1)
- if searchpair(s:end_start_regex, s:end_middle_regex, s:end_end_regex, 'bW',
- \ s:end_skip_expr) > 0
- let line = getline('.')
- if strpart(line, 0, col('.') - 1) =~ '=\s*$' &&
- \ strpart(line, col('.') - 1, 2) !~ 'do'
- let ind = virtcol('.') - 1
- else
- let ind = indent('.')
- 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(v:lnum, matchend(line, '^\s*') + 1)
- return indent('.')
- 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(v:lnum - 1)
-
- " If the line is empty and inside a string, use the previous line.
- if line =~ '^\s*$' && lnum != prevnonblank(v:lnum - 1)
- return indent(prevnonblank(v:lnum))
- endif
-
- " At the start of the file use zero indent.
- if lnum == 0
- return 0
- endif
-
- " Set up variables for current line.
- let line = getline(lnum)
- let ind = indent(lnum)
-
- " If the previous line ended with a block opening, add a level of indent.
- if s:Match(lnum, s:block_regex)
- return indent(s:GetMSL(lnum)) + &sw
- endif
-
- " If the previous line contained an opening bracket, and we are still in it,
- " add indent depending on the bracket type.
- if line =~ '[[({]'
- let counts = s:LineHasOpeningBrackets(lnum)
- if counts[0] == '1' && searchpair('(', '', ')', 'bW', s:skip_expr) > 0
- if col('.') + 1 == col('$')
- return ind + &sw
- else
- return virtcol('.')
- endif
- elseif counts[1] == '1' || counts[2] == '1'
- return ind + &sw
- else
- call cursor(v:lnum, 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
- " let ind = indent(lnum) + &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 and is continuation return its indent.
- " TODO: the || s:IsInString() thing worries me a bit.
- if p_lnum != lnum
- if s:Match(p_lnum,s: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 [*+/.-=], indent one extra level.
- if s:Match(lnum, s:continuation_regex)
- if lnum == p_lnum
- let ind = msl_ind + &sw
- else
- let ind = msl_ind
- endif
- endif
-
- " }}}2
-
- return ind
- endfunction
-
- " }}}1
-
- let &cpo = s:cpo_save
- unlet s:cpo_save
-
- " vim:set sw=2 sts=2 ts=8 noet:
-