278 lines
9.1 KiB
VimL
278 lines
9.1 KiB
VimL
" Vim indent file
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" Language: OCaml
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" Maintainers: Jean-Francois Yuen <jfyuen@happycoders.org>
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" Mike Leary <leary@nwlink.com>
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" Markus Mottl <markus.mottl@gmail.com>
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" URL: https://github.com/ocaml/vim-ocaml
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" Last Change: 2023 Aug 28 - Add undo_indent (Vim Project)
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" 2017 Jun 13
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" 2005 Jun 25 - Fixed multiple bugs due to 'else\nreturn ind' working
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" 2005 May 09 - Added an option to not indent OCaml-indents specially (MM)
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" 2013 June - commented textwidth (Marc Weber)
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"
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" Marc Weber's comment: This file may contain a lot of (very custom) stuff
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" which eventually should be moved somewhere else ..
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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 expandtab
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setlocal indentexpr=GetOCamlIndent()
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setlocal indentkeys+=0=and,0=class,0=constraint,0=done,0=else,0=end,0=exception,0=external,0=if,0=in,0=include,0=inherit,0=initializer,0=let,0=method,0=open,0=then,0=type,0=val,0=with,0;;,0>\],0\|\],0>},0\|,0},0\],0)
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setlocal nolisp
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setlocal nosmartindent
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let b:undo_indent = "setl et< inde< indk< lisp< si<"
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" At least Marc Weber and Markus Mottl do not like this:
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" setlocal textwidth=80
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" Comment formatting
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if !exists("no_ocaml_comments")
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if (has("comments"))
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setlocal comments=sr:(*\ ,mb:\ ,ex:*)
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setlocal comments^=sr:(**,mb:\ \ ,ex:*)
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setlocal fo=cqort
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endif
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endif
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" Only define the function once.
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if exists("*GetOCamlIndent")
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finish
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endif
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" Define some patterns:
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let s:beflet = '^\s*\(initializer\|method\|try\)\|\(\<\(begin\|do\|else\|in\|then\|try\)\|->\|<-\|=\|;\|(\)\s*$'
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let s:letpat = '^\s*\(let\|type\|module\|class\|open\|exception\|val\|include\|external\)\>'
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let s:letlim = '\(\<\(sig\|struct\)\|;;\)\s*$'
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let s:lim = '^\s*\(exception\|external\|include\|let\|module\|open\|type\|val\)\>'
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let s:module = '\<\%(begin\|sig\|struct\|object\)\>'
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let s:obj = '^\s*\(constraint\|inherit\|initializer\|method\|val\)\>\|\<\(object\|object\s*(.*)\)\s*$'
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let s:type = '^\s*\%(class\|let\|type\)\>.*='
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" Skipping pattern, for comments
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function! s:GetLineWithoutFullComment(lnum)
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let lnum = prevnonblank(a:lnum - 1)
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let lline = substitute(getline(lnum), '(\*.*\*)\s*$', '', '')
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while lline =~ '^\s*$' && lnum > 0
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let lnum = prevnonblank(lnum - 1)
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let lline = substitute(getline(lnum), '(\*.*\*)\s*$', '', '')
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endwhile
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return lnum
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endfunction
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" Indent for ';;' to match multiple 'let'
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function! s:GetInd(lnum, pat, lim)
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let llet = search(a:pat, 'bW')
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let old = indent(a:lnum)
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while llet > 0
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let old = indent(llet)
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let nb = s:GetLineWithoutFullComment(llet)
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if getline(nb) =~ a:lim
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return old
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endif
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let llet = search(a:pat, 'bW')
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endwhile
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return old
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endfunction
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" Indent pairs
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function! s:FindPair(pstart, pmid, pend)
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call search(a:pend, 'bW')
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return indent(searchpair(a:pstart, a:pmid, a:pend, 'bWn', 'synIDattr(synID(line("."), col("."), 0), "name") =~? "string\\|comment"'))
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endfunction
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" Indent 'let'
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function! s:FindLet(pstart, pmid, pend)
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call search(a:pend, 'bW')
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return indent(searchpair(a:pstart, a:pmid, a:pend, 'bWn', 'synIDattr(synID(line("."), col("."), 0), "name") =~? "string\\|comment" || getline(".") =~ "^\\s*let\\>.*=.*\\<in\\s*$" || getline(prevnonblank(".") - 1) =~ s:beflet'))
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endfunction
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function! GetOCamlIndent()
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" Find a non-commented line above the current line.
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let lnum = s:GetLineWithoutFullComment(v:lnum)
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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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let ind = indent(lnum)
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let lline = substitute(getline(lnum), '(\*.*\*)\s*$', '', '')
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" Return double 'shiftwidth' after lines matching:
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if lline =~ '^\s*|.*->\s*$'
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return ind + 2 * shiftwidth()
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endif
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let line = getline(v:lnum)
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" Indent if current line begins with 'end':
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if line =~ '^\s*end\>'
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return s:FindPair(s:module, '','\<end\>')
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" Indent if current line begins with 'done' for 'do':
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elseif line =~ '^\s*done\>'
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return s:FindPair('\<do\>', '','\<done\>')
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" Indent if current line begins with '}' or '>}':
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elseif line =~ '^\s*\(\|>\)}'
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return s:FindPair('{', '','}')
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" Indent if current line begins with ']', '|]' or '>]':
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elseif line =~ '^\s*\(\||\|>\)\]'
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return s:FindPair('\[', '','\]')
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" Indent if current line begins with ')':
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elseif line =~ '^\s*)'
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return s:FindPair('(', '',')')
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" Indent if current line begins with 'let':
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elseif line =~ '^\s*let\>'
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if lline !~ s:lim . '\|' . s:letlim . '\|' . s:beflet
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return s:FindLet(s:type, '','\<let\s*$')
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endif
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" Indent if current line begins with 'class' or 'type':
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elseif line =~ '^\s*\(class\|type\)\>'
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if lline !~ s:lim . '\|\<and\s*$\|' . s:letlim
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return s:FindLet(s:type, '','\<\(class\|type\)\s*$')
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endif
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" Indent for pattern matching:
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elseif line =~ '^\s*|'
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if lline !~ '^\s*\(|[^\]]\|\(match\|type\|with\)\>\)\|\<\(function\|parser\|private\|with\)\s*$'
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call search('|', 'bW')
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return indent(searchpair('^\s*\(match\|type\)\>\|\<\(function\|parser\|private\|with\)\s*$', '', '^\s*|', 'bWn', 'synIDattr(synID(line("."), col("."), 0), "name") =~? "string\\|comment" || getline(".") !~ "^\\s*|.*->"'))
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endif
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" Indent if current line begins with ';;':
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elseif line =~ '^\s*;;'
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if lline !~ ';;\s*$'
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return s:GetInd(v:lnum, s:letpat, s:letlim)
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endif
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" Indent if current line begins with 'in':
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elseif line =~ '^\s*in\>'
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if lline !~ '^\s*\(let\|and\)\>'
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return s:FindPair('\<let\>', '', '\<in\>')
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endif
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" Indent if current line begins with 'else':
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elseif line =~ '^\s*else\>'
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if lline !~ '^\s*\(if\|then\)\>'
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return s:FindPair('\<if\>', '', '\<else\>')
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endif
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" Indent if current line begins with 'then':
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elseif line =~ '^\s*then\>'
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if lline !~ '^\s*\(if\|else\)\>'
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return s:FindPair('\<if\>', '', '\<then\>')
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endif
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" Indent if current line begins with 'and':
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elseif line =~ '^\s*and\>'
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if lline !~ '^\s*\(and\|let\|type\)\>\|\<end\s*$'
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return ind - shiftwidth()
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endif
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" Indent if current line begins with 'with':
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elseif line =~ '^\s*with\>'
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if lline !~ '^\s*\(match\|try\)\>'
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return s:FindPair('\<\%(match\|try\)\>', '','\<with\>')
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endif
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" Indent if current line begins with 'exception', 'external', 'include' or
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" 'open':
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elseif line =~ '^\s*\(exception\|external\|include\|open\)\>'
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if lline !~ s:lim . '\|' . s:letlim
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call search(line)
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return indent(search('^\s*\(\(exception\|external\|include\|open\|type\)\>\|val\>.*:\)', 'bW'))
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endif
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" Indent if current line begins with 'val':
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elseif line =~ '^\s*val\>'
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if lline !~ '^\s*\(exception\|external\|include\|open\)\>\|' . s:obj . '\|' . s:letlim
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return indent(search('^\s*\(\(exception\|include\|initializer\|method\|open\|type\|val\)\>\|external\>.*:\)', 'bW'))
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endif
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" Indent if current line begins with 'constraint', 'inherit', 'initializer'
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" or 'method':
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elseif line =~ '^\s*\(constraint\|inherit\|initializer\|method\)\>'
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if lline !~ s:obj
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return indent(search('\<\(object\|object\s*(.*)\)\s*$', 'bW')) + shiftwidth()
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endif
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endif
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" Add a 'shiftwidth' after lines ending with:
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if lline =~ '\(:\|=\|->\|<-\|(\|\[\|{\|{<\|\[|\|\[<\|\<\(begin\|do\|else\|fun\|function\|functor\|if\|initializer\|object\|parser\|private\|sig\|struct\|then\|try\)\|\<object\s*(.*)\)\s*$'
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let ind = ind + shiftwidth()
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" Back to normal indent after lines ending with ';;':
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elseif lline =~ ';;\s*$' && lline !~ '^\s*;;'
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let ind = s:GetInd(v:lnum, s:letpat, s:letlim)
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" Back to normal indent after lines ending with 'end':
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elseif lline =~ '\<end\s*$'
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let ind = s:FindPair(s:module, '','\<end\>')
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" Back to normal indent after lines ending with 'in':
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elseif lline =~ '\<in\s*$' && lline !~ '^\s*in\>'
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let ind = s:FindPair('\<let\>', '', '\<in\>')
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" Back to normal indent after lines ending with 'done':
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elseif lline =~ '\<done\s*$'
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let ind = s:FindPair('\<do\>', '','\<done\>')
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" Back to normal indent after lines ending with '}' or '>}':
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elseif lline =~ '\(\|>\)}\s*$'
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let ind = s:FindPair('{', '','}')
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" Back to normal indent after lines ending with ']', '|]' or '>]':
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elseif lline =~ '\(\||\|>\)\]\s*$'
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let ind = s:FindPair('\[', '','\]')
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" Back to normal indent after comments:
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elseif lline =~ '\*)\s*$'
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call search('\*)', 'bW')
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let ind = indent(searchpair('(\*', '', '\*)', 'bWn', 'synIDattr(synID(line("."), col("."), 0), "name") =~? "string"'))
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" Back to normal indent after lines ending with ')':
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elseif lline =~ ')\s*$'
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let ind = s:FindPair('(', '',')')
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" If this is a multiline comment then align '*':
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elseif lline =~ '^\s*(\*' && line =~ '^\s*\*'
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let ind = ind + 1
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else
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" Don't change indentation of this line
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" for new lines (indent==0) use indentation of previous line
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" This is for preventing removing indentation of these args:
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" let f x =
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" let y = x + 1 in
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" Printf.printf
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" "o" << here
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" "oeuth" << don't touch indentation
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let i = indent(v:lnum)
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return i == 0 ? ind : i
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endif
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" Subtract a 'shiftwidth' after lines matching 'match ... with parser':
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if lline =~ '\<match\>.*\<with\>\s*\<parser\s*$'
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let ind = ind - shiftwidth()
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endif
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return ind
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endfunction
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" vim:sw=2
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