forked from aniani/vim
364 lines
11 KiB
VimL
364 lines
11 KiB
VimL
" Vim indent file
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" Language: Ruby
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" Maintainer: Nikolai Weibull <now at bitwi.se>
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" Info: $Id$
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" URL: http://vim-ruby.rubyforge.org
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" Anon CVS: See above site
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" Release Coordinator: Doug Kearns <dougkearns@gmail.com>
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" 0. Initialization {{{1
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" =================
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" Only load this indent file when no other was loaded.
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if exists("b:did_indent")
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finish
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endif
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let b:did_indent = 1
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setlocal nosmartindent
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" Now, set up our indentation expression and keys that trigger it.
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setlocal indentexpr=GetRubyIndent()
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setlocal indentkeys=0{,0},0),0],!^F,o,O,e
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setlocal indentkeys+==end,=elsif,=when,=ensure,=rescue,==begin,==end
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" Only define the function once.
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if exists("*GetRubyIndent")
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finish
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endif
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let s:cpo_save = &cpo
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set cpo&vim
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" 1. Variables {{{1
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" ============
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" Regex of syntax group names that are or delimit string or are comments.
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let s:syng_strcom = '\<ruby\%(String\|StringDelimiter\|ASCIICode' .
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\ '\|Interpolation\|NoInterpolation\|Escape\|Comment\|Documentation\)\>'
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" Regex of syntax group names that are strings.
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let s:syng_string =
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\ '\<ruby\%(String\|StringDelimiter\|Interpolation\|NoInterpolation\|Escape\)\>'
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" Regex of syntax group names that are strings or documentation.
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let s:syng_stringdoc =
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\'\<ruby\%(String\|StringDelimiter\|Interpolation\|NoInterpolation\|Escape\|Documentation\)\>'
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" Expression used to check whether we should skip a match with searchpair().
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let s:skip_expr =
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\ "synIDattr(synID(line('.'),col('.'),0),'name') =~ '".s:syng_strcom."'"
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" Regex used for words that, at the start of a line, add a level of indent.
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let s:ruby_indent_keywords = '^\s*\zs\<\%(module\|class\|def\|if\|for' .
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\ '\|while\|until\|else\|elsif\|case\|when\|unless\|begin\|ensure' .
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\ '\|rescue\)\>' .
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\ '\|\%([*+/,=:-]\|<<\|>>\)\s*\zs' .
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\ '\<\%(if\|for\|while\|until\|case\|unless\|begin\)\>'
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" Regex used for words that, at the start of a line, remove a level of indent.
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let s:ruby_deindent_keywords =
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\ '^\s*\zs\<\%(ensure\|else\|rescue\|elsif\|when\|end\)\>'
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" Regex that defines the start-match for the 'end' keyword.
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"let s:end_start_regex = '\%(^\|[^.]\)\<\%(module\|class\|def\|if\|for\|while\|until\|case\|unless\|begin\|do\)\>'
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" TODO: the do here should be restricted somewhat (only at end of line)?
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let s:end_start_regex = '^\s*\zs\<\%(module\|class\|def\|if\|for' .
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\ '\|while\|until\|case\|unless\|begin\)\>' .
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\ '\|\%([*+/,=:-]\|<<\|>>\)\s*\zs' .
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\ '\<\%(if\|for\|while\|until\|case\|unless\|begin\)\>' .
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\ '\|\<do\>'
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" Regex that defines the middle-match for the 'end' keyword.
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let s:end_middle_regex = '\<\%(ensure\|else\|\%(\%(^\|;\)\s*\)\@<=\<rescue\>\|when\|elsif\)\>'
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" Regex that defines the end-match for the 'end' keyword.
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let s:end_end_regex = '\%(^\|[^.:]\)\@<=\<end\>'
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" Expression used for searchpair() call for finding match for 'end' keyword.
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let s:end_skip_expr = s:skip_expr .
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\ ' || (expand("<cword>") == "do"' .
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\ ' && getline(".") =~ "^\\s*\\<while\\|until\\|for\\>")'
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" Regex that defines continuation lines, not including (, {, or [.
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let s:continuation_regex = '\%([\\*+/.,=:-]\|\W[|&?]\|||\|&&\)\s*\%(#.*\)\=$'
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" Regex that defines continuation lines.
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" TODO: this needs to deal with if ...: and so on
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let s:continuation_regex2 =
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\ '\%([\\*+/.,=:({[-]\|\W[|&?]\|||\|&&\)\s*\%(#.*\)\=$'
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" Regex that defines blocks.
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let s:block_regex =
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\ '\%(\<do\>\|{\)\s*\%(|\%([*@]\=\h\w*,\=\s*\)\%(,\s*[*@]\=\h\w*\)*|\)\=\s*\%(#.*\)\=$'
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" 2. Auxiliary Functions {{{1
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" ======================
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" Check if the character at lnum:col is inside a string, comment, or is ascii.
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function s:IsInStringOrComment(lnum, col)
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return synIDattr(synID(a:lnum, a:col, 0), 'name') =~ s:syng_strcom
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endfunction
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" Check if the character at lnum:col is inside a string.
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function s:IsInString(lnum, col)
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return synIDattr(synID(a:lnum, a:col, 0), 'name') =~ s:syng_string
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endfunction
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" Check if the character at lnum:col is inside a string or documentation.
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function s:IsInStringOrDocumentation(lnum, col)
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return synIDattr(synID(a:lnum, a:col, 0), 'name') =~ s:syng_stringdoc
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endfunction
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" Find line above 'lnum' that isn't empty, in a comment, or in a string.
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function s:PrevNonBlankNonString(lnum)
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let in_block = 0
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let lnum = prevnonblank(a:lnum)
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while lnum > 0
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" Go in and out of blocks comments as necessary.
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" If the line isn't empty (with opt. comment) or in a string, end search.
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let line = getline(lnum)
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if line =~ '^=begin$'
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if in_block
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let in_block = 0
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else
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break
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endif
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elseif !in_block && line =~ '^=end$'
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let in_block = 1
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elseif !in_block && line !~ '^\s*#.*$' && !(s:IsInStringOrComment(lnum, 1)
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\ && s:IsInStringOrComment(lnum, strlen(line)))
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break
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endif
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let lnum = prevnonblank(lnum - 1)
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endwhile
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return lnum
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endfunction
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" Find line above 'lnum' that started the continuation 'lnum' may be part of.
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function s:GetMSL(lnum)
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" Start on the line we're at and use its indent.
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let msl = a:lnum
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let lnum = s:PrevNonBlankNonString(a:lnum - 1)
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while lnum > 0
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" If we have a continuation line, or we're in a string, use line as MSL.
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" Otherwise, terminate search as we have found our MSL already.
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let line = getline(lnum)
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let col = match(line, s:continuation_regex2) + 1
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if (col > 0 && !s:IsInStringOrComment(lnum, col))
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\ || s:IsInString(lnum, strlen(line))
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let msl = lnum
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else
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break
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endif
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let lnum = s:PrevNonBlankNonString(lnum - 1)
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endwhile
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return msl
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endfunction
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" Check if line 'lnum' has more opening brackets than closing ones.
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function s:LineHasOpeningBrackets(lnum)
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let open_0 = 0
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let open_2 = 0
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let open_4 = 0
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let line = getline(a:lnum)
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let pos = match(line, '[][(){}]', 0)
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while pos != -1
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if !s:IsInStringOrComment(a:lnum, pos + 1)
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let idx = stridx('(){}[]', line[pos])
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if idx % 2 == 0
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let open_{idx} = open_{idx} + 1
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else
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let open_{idx - 1} = open_{idx - 1} - 1
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endif
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endif
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let pos = match(line, '[][(){}]', pos + 1)
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endwhile
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return (open_0 > 0) . (open_2 > 0) . (open_4 > 0)
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endfunction
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function s:Match(lnum, regex)
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let col = match(getline(a:lnum), a:regex) + 1
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return col > 0 && !s:IsInStringOrComment(a:lnum, col) ? col : 0
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endfunction
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function s:MatchLast(lnum, regex)
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let line = getline(a:lnum)
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let col = match(line, '.*\zs' . a:regex)
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while col != -1 && s:IsInStringOrComment(a:lnum, col)
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let line = strpart(line, 0, col)
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let col = match(line, '.*' . a:regex)
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endwhile
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return col + 1
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endfunction
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" 3. GetRubyIndent Function {{{1
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" =========================
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function GetRubyIndent()
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" 3.1. Setup {{{2
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" ----------
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" Set up variables for restoring position in file. Could use v:lnum here.
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let vcol = col('.')
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" 3.2. Work on the current line {{{2
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" -----------------------------
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" Get the current line.
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let line = getline(v:lnum)
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let ind = -1
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" If we got a closing bracket on an empty line, find its match and indent
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" according to it. For parentheses we indent to its column - 1, for the
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" others we indent to the containing line's MSL's level. Return -1 if fail.
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let col = matchend(line, '^\s*[]})]')
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if col > 0 && !s:IsInStringOrComment(v:lnum, col)
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call cursor(v:lnum, col)
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let bs = strpart('(){}[]', stridx(')}]', line[col - 1]) * 2, 2)
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if searchpair(escape(bs[0], '\['), '', bs[1], 'bW', s:skip_expr) > 0
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let ind = line[col-1]==')' ? virtcol('.')-1 : indent(s:GetMSL(line('.')))
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endif
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return ind
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endif
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" If we have a =begin or =end set indent to first column.
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if match(line, '^\s*\%(=begin\|=end\)$') != -1
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return 0
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endif
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" If we have a deindenting keyword, find its match and indent to its level.
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" TODO: this is messy
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if s:Match(v:lnum, s:ruby_deindent_keywords)
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call cursor(v:lnum, 1)
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if searchpair(s:end_start_regex, s:end_middle_regex, s:end_end_regex, 'bW',
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\ s:end_skip_expr) > 0
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let line = getline('.')
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if strpart(line, 0, col('.') - 1) =~ '=\s*$' &&
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\ strpart(line, col('.') - 1, 2) !~ 'do'
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let ind = virtcol('.') - 1
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else
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let ind = indent('.')
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endif
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endif
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return ind
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endif
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" If we are in a multi-line string or line-comment, don't do anything to it.
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if s:IsInStringOrDocumentation(v:lnum, matchend(line, '^\s*') + 1)
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return indent('.')
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endif
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" 3.3. Work on the previous line. {{{2
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" -------------------------------
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" Find a non-blank, non-multi-line string line above the current line.
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let lnum = s:PrevNonBlankNonString(v:lnum - 1)
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" At the start of the file use zero indent.
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if lnum == 0
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return 0
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endif
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" Set up variables for current line.
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let line = getline(lnum)
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let ind = indent(lnum)
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" If the previous line ended with a block opening, add a level of indent.
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if s:Match(lnum, s:block_regex)
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return indent(s:GetMSL(lnum)) + &sw
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endif
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" If the previous line contained an opening bracket, and we are still in it,
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" add indent depending on the bracket type.
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if line =~ '[[({]'
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let counts = s:LineHasOpeningBrackets(lnum)
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if counts[0] == '1' && searchpair('(', '', ')', 'bW', s:skip_expr) > 0
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return virtcol('.')
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elseif counts[1] == '1' || counts[2] == '1'
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return ind + &sw
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else
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call cursor(v:lnum, vcol)
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end
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endif
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" If the previous line ended with an "end", match that "end"s beginning's
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" indent.
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let col = s:Match(lnum, '\%(^\|[^.]\)\<end\>\s*\%(#.*\)\=$')
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if col > 0
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call cursor(lnum, col)
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if searchpair(s:end_start_regex, '', s:end_end_regex, 'bW',
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\ s:end_skip_expr) > 0
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let n = line('.')
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let ind = indent('.')
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let msl = s:GetMSL(n)
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if msl != n
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let ind = indent(msl)
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end
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return ind
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endif
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end
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let col = s:Match(lnum, s:ruby_indent_keywords)
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if col > 0
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call cursor(lnum, col)
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let ind = virtcol('.') - 1 + &sw
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" let ind = indent(lnum) + &sw
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" TODO: make this better (we need to count them) (or, if a searchpair
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" fails, we know that something is lacking an end and thus we indent a
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" level
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if s:Match(lnum, s:end_end_regex)
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let ind = indent('.')
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endif
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return ind
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endif
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" 3.4. Work on the MSL line. {{{2
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" --------------------------
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" Set up variables to use and search for MSL to the previous line.
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let p_lnum = lnum
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let lnum = s:GetMSL(lnum)
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" If the previous line wasn't a MSL and is continuation return its indent.
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" TODO: the || s:IsInString() thing worries me a bit.
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if p_lnum != lnum
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if s:Match(p_lnum,s:continuation_regex)||s:IsInString(p_lnum,strlen(line))
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return ind
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endif
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endif
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" Set up more variables, now that we know we wasn't continuation bound.
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let line = getline(lnum)
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let msl_ind = indent(lnum)
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" If the MSL line had an indenting keyword in it, add a level of indent.
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" TODO: this does not take into account contrived things such as
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" module Foo; class Bar; end
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if s:Match(lnum, s:ruby_indent_keywords)
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let ind = msl_ind + &sw
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if s:Match(lnum, s:end_end_regex)
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let ind = ind - &sw
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endif
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return ind
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endif
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" If the previous line ended with [*+/.-=], indent one extra level.
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if s:Match(lnum, s:continuation_regex)
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if lnum == p_lnum
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let ind = msl_ind + &sw
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else
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let ind = msl_ind
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endif
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endif
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" }}}2
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return ind
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endfunction
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" }}}1
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let &cpo = s:cpo_save
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unlet s:cpo_save
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