" Vim indent file
" Language: SML
" Maintainer: Saikat Guha <sg266@cornell.edu>
" Hubert Chao <hc85@cornell.edu>
" Original OCaml Version:
" Jean-Francois Yuen <jfyuen@ifrance.com>
" Mike Leary <leary@nwlink.com>
" Markus Mottl <markus@oefai.at>
" OCaml URL: http://www.oefai.at/~markus/vim/indent/ocaml.vim
" Last Change: 2003 Jan 04 - Adapted to SML
" 2002 Nov 06 - Some fixes (JY)
" 2002 Oct 28 - Fixed bug with indentation of ']' (MM)
" 2002 Oct 22 - Major rewrite (JY)
" Only load this indent file when no other was loaded.
if exists("b:did_indent")
finish
endif
let b:did_indent = 1
setlocal expandtab
setlocal indentexpr=GetSMLIndent()
setlocal indentkeys+=0=and,0=else,0=end,0=handle,0=if,0=in,0=let,0=then,0=val,0=fun,0=\|,0=*),0)
setlocal nolisp
setlocal nosmartindent
setlocal textwidth=80
setlocal shiftwidth=2
" Comment formatting
if (has("comments"))
set comments=sr:(*,mb:*,ex:*)
set fo=cqort
endif
" Only define the function once.
"if exists("*GetSMLIndent")
"finish
"endif
" Define some patterns:
let s:beflet = '^\s*\(initializer\|method\|try\)\|\(\<\(begin\|do\|else\|in\|then\|try\)\|->\|;\)\s*$'
let s:letpat = '^\s*\(let\|type\|module\|class\|open\|exception\|val\|include\|external\)\>'
let s:letlim = '\(\<\(sig\|struct\)\|;;\)\s*$'
let s:lim = '^\s*\(exception\|external\|include\|let\|module\|open\|type\|val\)\>'
let s:module = '\<\%(let\|sig\|struct\)\>'
let s:obj = '^\s*\(constraint\|inherit\|initializer\|method\|val\)\>\|\<\(object\|object\s*(.*)\)\s*$'
let s:type = '^\s*\%(let\|type\)\>.*='
let s:val = '^\s*\(val\|external\)\>.*:'
" Skipping pattern, for comments
function! s:SkipPattern(lnum, pat)
let def = prevnonblank(a:lnum - 1)
while def > 0 && getline(def) =~ a:pat
let def = prevnonblank(def - 1)
endwhile
return def
endfunction
" Indent for ';;' to match multiple 'let'
function! s:GetInd(lnum, pat, lim)
let llet = search(a:pat, 'bW')
let old = indent(a:lnum)
while llet > 0
let old = indent(llet)
let nb = s:SkipPattern(llet, '^\s*(\*.*\*)\s*$')
if getline(nb) =~ a:lim
return old
endif
let llet = search(a:pat, 'bW')
endwhile
return old
endfunction
" Indent pairs
function! s:FindPair(pstart, pmid, pend)
call search(a:pend, 'bW')
" return indent(searchpair(a:pstart, a:pmid, a:pend, 'bWn', 'synIDattr(synID(line("."), col("."), 0), "name") =~? "string\\|comment"'))
let lno = searchpair(a:pstart, a:pmid, a:pend, 'bW', 'synIDattr(synID(line("."), col("."), 0), "name") =~? "string\\|comment"')
if lno == -1
return indent(lno)
else
return col(".") - 1
endif
endfunction
function! s:FindLet(pstart, pmid, pend)
call search(a:pend, 'bW')
" return indent(searchpair(a:pstart, a:pmid, a:pend, 'bWn', 'synIDattr(synID(line("."), col("."), 0), "name") =~? "string\\|comment"'))
let lno = searchpair(a:pstart, a:pmid, a:pend, 'bW', 'synIDattr(synID(line("."), col("."), 0), "name") =~? "string\\|comment"')
let moduleLine = getline(lno)
if lno == -1 || moduleLine =~ '^\s*\(fun\|structure\|signature\)\>'
return indent(lno)
else
return col(".") - 1
endif
endfunction
" Indent 'let'
"function! s:FindLet(pstart, pmid, pend)
" call search(a:pend, 'bW')
" return indent(searchpair(a:pstart, a:pmid, a:pend, 'bWn', 'synIDattr(synID(line("."), col("."), 0), "name") =~? "string\\|comment" || getline(".") =~ "^\\s*let\\>.*=.*\\<in\\s*$" || getline(prevnonblank(".") - 1) =~ "^\\s*let\\>.*=\\s*$\\|" . s:beflet'))
"endfunction
function! GetSMLIndent()
" Find a non-blank line above the current line.
let lnum = prevnonblank(v:lnum - 1)
" At the start of the file use zero indent.
if lnum == 0
return 0
endif
let ind = indent(lnum)
let lline = getline(lnum)
" Return double 'shiftwidth' after lines matching:
if lline =~ '^\s*|.*=>\s*$'
return ind + 2 *shiftwidth()
elseif lline =~ '^\s*val\>.*=\s*$'
return ind + shiftwidth()
endif
let line = getline(v:lnum)
" Indent lines starting with 'end' to matching module
if line =~ '^\s*end\>'
return s:FindLet(s:module, '', '\<end\>')
" Match 'else' with 'if'
elseif line =~ '^\s*else\>'
if lline !~ '^\s*\(if\|else\|then\)\>'
return s:FindPair('\<if\>', '', '\<then\>')
else
return ind
endif
" Match 'then' with 'if'
elseif line =~ '^\s*then\>'
if lline !~ '^\s*\(if\|else\|then\)\>'
return s:FindPair('\<if\>', '', '\<then\>')
else
return ind
endif
" Indent if current line begins with ']'
elseif line =~ '^\s*\]'
return s:FindPair('\[','','\]')
" Indent current line starting with 'in' to last matching 'let'
elseif line =~ '^\s*in\>'
let ind = s:FindLet('\<let\>','','\<in\>')
" Indent from last matching module if line matches:
elseif line =~ '^\s*\(fun\|val\|open\|structure\|and\|datatype\|type\|exception\)\>'
cursor(lnum,1)
let lastModule = indent(searchpair(s:module, '', '\<end\>', 'bWn', 'synIDattr(synID(line("."), col("."), 0), "name") =~? "string\\|comment"'))
if lastModule == -1
return 0
else
return lastModule + shiftwidth()
endif
" Indent lines starting with '|' from matching 'case', 'handle'
elseif line =~ '^\s*|'
" cursor(lnum,1)
let lastSwitch = search('\<\(case\|handle\|fun\|datatype\)\>','bW')
let switchLine = getline(lastSwitch)
let switchLineIndent = indent(lastSwitch)
if lline =~ '^\s*|'
return ind
endif
if switchLine =~ '\<case\>'
return col(".") + 2
elseif switchLine =~ '\<handle\>'
return switchLineIndent + shiftwidth()
elseif switchLine =~ '\<datatype\>'
call search('=')
return col(".") - 1
else
return switchLineIndent + 2
endif
" Indent if last line ends with 'sig', 'struct', 'let', 'then', 'else',
" 'in'
elseif lline =~ '\<\(sig\|struct\|let\|in\|then\|else\)\s*$'
let ind = ind + shiftwidth()
" Indent if last line ends with 'of', align from 'case'
elseif lline =~ '\<\(of\)\s*$'
call search('\<case\>',"bW")
let ind = col(".")+4
" Indent if current line starts with 'of'
elseif line =~ '^\s*of\>'
call search('\<case\>',"bW")
let ind = col(".")+1
" Indent if last line starts with 'fun', 'case', 'fn'
elseif lline =~ '^\s*\(fun\|fn\|case\)\>'
let ind = ind + shiftwidth()
endif
" Don't indent 'let' if last line started with 'fun', 'fn'
if line =~ '^\s*let\>'
if lline =~ '^\s*\(fun\|fn\)'
let ind = ind - shiftwidth()
endif
endif
return ind
endfunction
" vim:sw=2
