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Diffstat (limited to 'runtime/indent/sml.vim')
| -rw-r--r-- | runtime/indent/sml.vim | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/runtime/indent/sml.vim b/runtime/indent/sml.vim new file mode 100644 index 0000000..a0b0c3e --- /dev/null +++ b/runtime/indent/sml.vim @@ -0,0 +1,220 @@ +" 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: 2022 Apr 06 +" 2002 Nov 06 - Some fixes (JY) +" 2002 Oct 28 - Fixed bug with indentation of ']' (MM) +" 2002 Oct 22 - Major rewrite (JY) +" 2022 April: b:undo_indent added by Doug Kearns + +" 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 + +let b:undo_indent = "setl et< inde< indk< lisp< si< sw< tw<" + +" 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 |