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| -rw-r--r-- | indent/mp.vim | 364 |
1 files changed, 0 insertions, 364 deletions
diff --git a/indent/mp.vim b/indent/mp.vim deleted file mode 100644 index 36c3f716..00000000 --- a/indent/mp.vim +++ /dev/null @@ -1,364 +0,0 @@ -if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'vim') == -1 - -" MetaPost indent file -" Language: MetaPost -" Maintainer: Nicola Vitacolonna <nvitacolonna@gmail.com> -" Former Maintainers: Eugene Minkovskii <emin@mccme.ru> -" Last Change: 2016 Oct 2, 4:13pm -" Version: 0.2 - -if exists("b:did_indent") - finish -endif -let b:did_indent = 1 - -setlocal indentexpr=GetMetaPostIndent() -setlocal indentkeys+==end,=else,=fi,=fill,0),0] - -let b:undo_indent = "setl indentkeys< indentexpr<" - -" Only define the function once. -if exists("*GetMetaPostIndent") - finish -endif -let s:keepcpo= &cpo -set cpo&vim - -function GetMetaPostIndent() - let ignorecase_save = &ignorecase - try - let &ignorecase = 0 - return GetMetaPostIndentIntern() - finally - let &ignorecase = ignorecase_save - endtry -endfunc - -" Regexps {{{ -" Note: the next three variables are made global so that a user may add -" further keywords. -" -" Example: -" -" Put these in ~/.vim/after/indent/mp.vim -" -" let g:mp_open_tag .= '\|\<begintest\>' -" let g:mp_close_tag .= '\|\<endtest\>' - -" Expressions starting indented blocks -let g:mp_open_tag = '' - \ . '\<if\>' - \ . '\|\<else\%[if]\>' - \ . '\|\<for\%(\|ever\|suffixes\)\>' - \ . '\|\<begingroup\>' - \ . '\|\<\%(\|var\|primary\|secondary\|tertiary\)def\>' - \ . '\|^\s*\<begin\%(fig\|graph\|glyph\|char\|logochar\)\>' - \ . '\|[([{]' - -" Expressions ending indented blocks -let g:mp_close_tag = '' - \ . '\<fi\>' - \ . '\|\<else\%[if]\>' - \ . '\|\<end\%(\|for\|group\|def\|fig\|char\|glyph\|graph\)\>' - \ . '\|[)\]}]' - -" Statements that may span multiple lines and are ended by a semicolon. To -" keep this list short, statements that are unlikely to be very long or are -" not very common (e.g., keywords like `interim` or `showtoken`) are not -" included. -" -" The regex for assignments and equations (the last branch) is tricky, because -" it must not match things like `for i :=`, `if a=b`, `def...=`, etc... It is -" not perfect, but it works reasonably well. -let g:mp_statement = '' - \ . '\<\%(\|un\|cut\)draw\>' - \ . '\|\<\%(\|un\)fill\%[draw]\>' - \ . '\|\<draw\%(dbl\)\=arrow\>' - \ . '\|\<clip\>' - \ . '\|\<addto\>' - \ . '\|\<save\>' - \ . '\|\<setbounds\>' - \ . '\|\<message\>' - \ . '\|\<errmessage\>' - \ . '\|\<errhelp\>' - \ . '\|\<fontmapline\>' - \ . '\|\<pickup\>' - \ . '\|\<show\>' - \ . '\|\<special\>' - \ . '\|\<write\>' - \ . '\|\%(^\|;\)\%([^;=]*\%('.g:mp_open_tag.'\)\)\@!.\{-}:\==' - -" A line ends with zero or more spaces, possibly followed by a comment. -let s:eol = '\s*\%($\|%\)' -" }}} - -" Auxiliary functions {{{ -" Returns 1 if (0-based) position immediately preceding `pos` in `line` is -" inside a string or a comment; returns 0 otherwise. - -" This is the function that is called more often when indenting, so it is -" critical that it is efficient. The method we use is significantly faster -" than using syntax attributes, and more general (it does not require -" syntax_items). It is also faster than using a single regex matching an even -" number of quotes. It helps that MetaPost strings cannot span more than one -" line and cannot contain escaped quotes. -function! s:CommentOrString(line, pos) - let in_string = 0 - let q = stridx(a:line, '"') - let c = stridx(a:line, '%') - while q >= 0 && q < a:pos - if c >= 0 && c < q - if in_string " Find next percent symbol - let c = stridx(a:line, '%', q + 1) - else " Inside comment - return 1 - endif - endif - let in_string = 1 - in_string - let q = stridx(a:line, '"', q + 1) " Find next quote - endwhile - return in_string || (c >= 0 && c <= a:pos) -endfunction - -" Find the first non-comment non-blank line before the current line. -function! s:PrevNonBlankNonComment(lnum) - let l:lnum = prevnonblank(a:lnum - 1) - while getline(l:lnum) =~# '^\s*%' - let l:lnum = prevnonblank(l:lnum - 1) - endwhile - return l:lnum -endfunction - -" Returns true if the last tag appearing in the line is an open tag; returns -" false otherwise. -function! s:LastTagIsOpen(line) - let o = s:LastValidMatchEnd(a:line, g:mp_open_tag, 0) - if o == - 1 | return v:false | endif - return s:LastValidMatchEnd(a:line, g:mp_close_tag, o) < 0 -endfunction - -" A simple, efficient and quite effective heuristics is used to test whether -" a line should cause the next line to be indented: count the "opening tags" -" (if, for, def, ...) in the line, count the "closing tags" (endif, endfor, -" ...) in the line, and compute the difference. We call the result the -" "weight" of the line. If the weight is positive, then the next line should -" most likely be indented. Note that `else` and `elseif` are both opening and -" closing tags, so they "cancel out" in almost all cases, the only exception -" being a leading `else[if]`, which is counted as an opening tag, but not as -" a closing tag (so that, for instance, a line containing a single `else:` -" will have weight equal to one, not zero). We do not treat a trailing -" `else[if]` in any special way, because lines ending with an open tag are -" dealt with separately before this function is called (see -" GetMetaPostIndentIntern()). -" -" Example: -" -" forsuffixes $=a,b: if x.$ = y.$ : draw else: fill fi -" % This line will be indented because |{forsuffixes,if,else}| > |{else,fi}| (3 > 2) -" endfor - -function! s:Weight(line) - let [o, i] = [0, s:ValidMatchEnd(a:line, g:mp_open_tag, 0)] - while i > 0 - let o += 1 - let i = s:ValidMatchEnd(a:line, g:mp_open_tag, i) - endwhile - let [c, i] = [0, matchend(a:line, '^\s*\<else\%[if]\>')] " Skip a leading else[if] - let i = s:ValidMatchEnd(a:line, g:mp_close_tag, i) - while i > 0 - let c += 1 - let i = s:ValidMatchEnd(a:line, g:mp_close_tag, i) - endwhile - return o - c -endfunction - -" Similar to matchend(), but skips strings and comments. -" line: a String -function! s:ValidMatchEnd(line, pat, start) - let i = matchend(a:line, a:pat, a:start) - while i > 0 && s:CommentOrString(a:line, i) - let i = matchend(a:line, a:pat, i) - endwhile - return i -endfunction - -" Like s:ValidMatchEnd(), but returns the end position of the last (i.e., -" rightmost) match. -function! s:LastValidMatchEnd(line, pat, start) - let last_found = -1 - let i = matchend(a:line, a:pat, a:start) - while i > 0 - if !s:CommentOrString(a:line, i) - let last_found = i - endif - let i = matchend(a:line, a:pat, i) - endwhile - return last_found -endfunction - -function! s:DecreaseIndentOnClosingTag(curr_indent) - let cur_text = getline(v:lnum) - if cur_text =~# '^\s*\%('.g:mp_close_tag.'\)' - return max([a:curr_indent - shiftwidth(), 0]) - endif - return a:curr_indent -endfunction -" }}} - -" Main function {{{ -" -" Note: Every rule of indentation in MetaPost is very subjective. We might get -" creative, but things get murky very soon (there are too many corner cases). -" So, we provide a means for the user to decide what to do when this script -" doesn't get it. We use a simple idea: use '%>', '%<' and '%=' to explicitly -" control indentation. The '<' and '>' symbols may be repeated many times -" (e.g., '%>>' will cause the next line to be indented twice). -" -" By using '%>...', '%<...' and '%=', the indentation the user wants is -" preserved by commands like gg=G, even if it does not follow the rules of -" this script. -" -" Example: -" -" def foo = -" makepen( -" subpath(T-n,t) of r %> -" shifted .5down %> -" --subpath(t,T) of r shifted .5up -- cycle %<<< -" ) -" withcolor black -" enddef -" -" The default indentation of the previous example would be: -" -" def foo = -" makepen( -" subpath(T-n,t) of r -" shifted .5down -" --subpath(t,T) of r shifted .5up -- cycle -" ) -" withcolor black -" enddef -" -" Personally, I prefer the latter, but anyway... -function! GetMetaPostIndentIntern() - " Do not touch indentation inside verbatimtex/btex.. etex blocks. - if synIDattr(synID(v:lnum, 1, 1), "name") =~# '^mpTeXinsert$\|^tex\|^Delimiter' - return -1 - endif - - " This is the reference line relative to which the current line is indented - " (but see below). - let lnum = s:PrevNonBlankNonComment(v:lnum) - - " At the start of the file use zero indent. - if lnum == 0 - return 0 - endif - - let prev_text = getline(lnum) - - " User-defined overrides take precedence over anything else. - " See above for an example. - let j = match(prev_text, '%[<>=]') - if j > 0 - let i = strlen(matchstr(prev_text, '%>\+', j)) - 1 - if i > 0 - return indent(lnum) + i * shiftwidth() - endif - - let i = strlen(matchstr(prev_text, '%<\+', j)) - 1 - if i > 0 - return max([indent(lnum) - i * shiftwidth(), 0]) - endif - - if match(prev_text, '%=', j) - return indent(lnum) - endif - endif - - " If the reference line ends with an open tag, indent. - " - " Example: - " - " if c: - " 0 - " else: - " 1 - " fi if c2: % Note that this line has weight equal to zero. - " ... % This line will be indented - if s:LastTagIsOpen(prev_text) - return s:DecreaseIndentOnClosingTag(indent(lnum) + shiftwidth()) - endif - - " Lines with a positive weight are unbalanced and should likely be indented. - " - " Example: - " - " def f = enddef for i = 1 upto 5: if x[i] > 0: 1 else: 2 fi - " ... % This line will be indented (because of the unterminated `for`) - if s:Weight(prev_text) > 0 - return s:DecreaseIndentOnClosingTag(indent(lnum) + shiftwidth()) - endif - - " Unterminated statements cause indentation to kick in. - " - " Example: - " - " draw unitsquare - " withcolor black; % This line is indented because of `draw`. - " x := a + b + c - " + d + e; % This line is indented because of `:=`. - " - let i = s:LastValidMatchEnd(prev_text, g:mp_statement, 0) - if i >= 0 " Does the line contain a statement? - if s:ValidMatchEnd(prev_text, ';', i) < 0 " Is the statement unterminated? - return indent(lnum) + shiftwidth() - else - return s:DecreaseIndentOnClosingTag(indent(lnum)) - endif - endif - - " Deal with the special case of a statement spanning multiple lines. If the - " current reference line L ends with a semicolon, search backwards for - " another semicolon or a statement keyword. If the latter is found first, - " its line is used as the reference line for indenting the current line - " instead of L. - " - " Example: - " - " if cond: - " draw if a: z0 else: z1 fi - " shifted S - " scaled T; % L - " - " for i = 1 upto 3: % <-- Current line: this gets the same indent as `draw ...` - " - " NOTE: we get here only if L does not contain a statement (among those - " listed in g:mp_statement). - if s:ValidMatchEnd(prev_text, ';'.s:eol, 0) >= 0 " L ends with a semicolon - let stm_lnum = s:PrevNonBlankNonComment(lnum) - while stm_lnum > 0 - let prev_text = getline(stm_lnum) - let sc_pos = s:LastValidMatchEnd(prev_text, ';', 0) - let stm_pos = s:ValidMatchEnd(prev_text, g:mp_statement, sc_pos) - if stm_pos > sc_pos - let lnum = stm_lnum - break - elseif sc_pos > stm_pos - break - endif - let stm_lnum = s:PrevNonBlankNonComment(stm_lnum) - endwhile - endif - - return s:DecreaseIndentOnClosingTag(indent(lnum)) -endfunction -" }}} - -let &cpo = s:keepcpo -unlet s:keepcpo - -" vim:sw=2:fdm=marker - -endif |