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falcon.vim
" Vim indent file " Language: Falcon " Maintainer: Steven Oliver <oliver.steven@gmail.com> " Website: https://steveno@github.com/steveno/falconpl-vim.git " Credits: This is, to a great extent, a copy n' paste of ruby.vim. " 1. Setup {{{1 " ============ " Only load this indent file when no other was loaded. if exists("b:did_indent") finish endif let b:did_indent = 1 setlocal nosmartindent " Setup indent function and when to use it setlocal indentexpr=FalconGetIndent(v:lnum) setlocal indentkeys=0{,0},0),0],!^F,o,O,e setlocal indentkeys+==~case,=~catch,=~default,=~elif,=~else,=~end,=~\" " Define the appropriate indent function but only once if exists("*FalconGetIndent") finish endif let s:cpo_save = &cpo set cpo&vim " 2. Variables {{{1 " ============ " Regex of syntax group names that are strings AND comments let s:syng_strcom = '\<falcon\%(String\|StringEscape\|Comment\)\>' " Regex of syntax group names that are strings let s:syng_string = '\<falcon\%(String\|StringEscape\)\>' " Regex that defines blocks. " " Note that there's a slight problem with this regex and s:continuation_regex. " Code like this will be matched by both: " " method_call do |(a, b)| " " The reason is that the pipe matches a hanging "|" operator. " let s:block_regex = \ '\%(\<do:\@!\>\|%\@<!{\)\s*\%(|\s*(*\s*\%([*@&]\=\h\w*,\=\s*\)\%(,\s*(*\s*[*@&]\=\h\w*\s*)*\s*\)*|\)\=\s*\%(#.*\)\=$' let s:block_continuation_regex = '^\s*[^])}\t ].*'.s:block_regex " Regex that defines continuation lines. " TODO: this needs to deal with if ...: and so on let s:continuation_regex = \ '\%(%\@<![({[\\.,:*/%+]\|\<and\|\<or\|\%(<%\)\@<![=-]\|\W[|&?]\|||\|&&\)\s*\%(#.*\)\=$' " Regex that defines bracket continuations let s:bracket_continuation_regex = '%\@<!\%([({[]\)\s*\%(#.*\)\=$' " Regex that defines continuation lines, not including (, {, or [. let s:non_bracket_continuation_regex = '\%([\\.,:*/%+]\|\<and\|\<or\|\%(<%\)\@<![=-]\|\W[|&?]\|||\|&&\)\s*\%(#.*\)\=$' " Keywords to indent on let s:falcon_indent_keywords = '^\s*\(case\|catch\|class\|enum\|default\|elif\|else' . \ '\|for\|function\|if.*"[^"]*:.*"\|if \(\(:\)\@!.\)*$\|loop\|object\|select' . \ '\|switch\|try\|while\|\w*\s*=\s*\w*([$\)' " Keywords to deindent on let s:falcon_deindent_keywords = '^\s*\(case\|catch\|default\|elif\|else\|end\)' " 3. Functions {{{1 " ============ " Check if the character at lnum:col is inside a string, comment, or is ascii. function s:IsInStringOrComment(lnum, col) return synIDattr(synID(a:lnum, a:col, 1), 'name') =~ s:syng_strcom endfunction " Check if the character at lnum:col is inside a string. function s:IsInString(lnum, col) return synIDattr(synID(a:lnum, a:col, 1), 'name') =~ s:syng_string endfunction " Check if the character at lnum:col is inside a string delimiter function s:IsInStringDelimiter(lnum, col) return synIDattr(synID(a:lnum, a:col, 1), 'name') == 'falconStringDelimiter' endfunction " Find line above 'lnum' that isn't empty, in a comment, or in a string. function s:PrevNonBlankNonString(lnum) let in_block = 0 let lnum = prevnonblank(a:lnum) while lnum > 0 " Go in and out of blocks comments as necessary. " If the line isn't empty (with opt. comment) or in a string, end search. let line = getline(lnum) if line =~ '^=begin' if in_block let in_block = 0 else break endif elseif !in_block && line =~ '^=end' let in_block = 1 elseif !in_block && line !~ '^\s*#.*$' && !(s:IsInStringOrComment(lnum, 1) \ && s:IsInStringOrComment(lnum, strlen(line))) break endif let lnum = prevnonblank(lnum - 1) endwhile return lnum endfunction " Find line above 'lnum' that started the continuation 'lnum' may be part of. function s:GetMSL(lnum) " Start on the line we're at and use its indent. let msl = a:lnum let msl_body = getline(msl) let lnum = s:PrevNonBlankNonString(a:lnum - 1) while lnum > 0 " If we have a continuation line, or we're in a string, use line as MSL. " Otherwise, terminate search as we have found our MSL already. let line = getline(lnum) if s:Match(line, s:non_bracket_continuation_regex) && \ s:Match(msl, s:non_bracket_continuation_regex) " If the current line is a non-bracket continuation and so is the " previous one, keep its indent and continue looking for an MSL. " " Example: " method_call one, " two, " three " let msl = lnum elseif s:Match(lnum, s:non_bracket_continuation_regex) && \ (s:Match(msl, s:bracket_continuation_regex) || s:Match(msl, s:block_continuation_regex)) " If the current line is a bracket continuation or a block-starter, but " the previous is a non-bracket one, respect the previous' indentation, " and stop here. " " Example: " method_call one, " two { " three " return lnum elseif s:Match(lnum, s:bracket_continuation_regex) && \ (s:Match(msl, s:bracket_continuation_regex) || s:Match(msl, s:block_continuation_regex)) " If both lines are bracket continuations (the current may also be a " block-starter), use the current one's and stop here " " Example: " method_call( " other_method_call( " foo return msl elseif s:Match(lnum, s:block_regex) && \ !s:Match(msl, s:continuation_regex) && \ !s:Match(msl, s:block_continuation_regex) " If the previous line is a block-starter and the current one is " mostly ordinary, use the current one as the MSL. " " Example: " method_call do " something " something_else return msl else let col = match(line, s:continuation_regex) + 1 if (col > 0 && !s:IsInStringOrComment(lnum, col)) \ || s:IsInString(lnum, strlen(line)) let msl = lnum else break endif endif let msl_body = getline(msl) let lnum = s:PrevNonBlankNonString(lnum - 1) endwhile return msl endfunction " Check if line 'lnum' has more opening brackets than closing ones. function s:ExtraBrackets(lnum) let opening = {'parentheses': [], 'braces': [], 'brackets': []} let closing = {'parentheses': [], 'braces': [], 'brackets': []} let line = getline(a:lnum) let pos = match(line, '[][(){}]', 0) " Save any encountered opening brackets, and remove them once a matching " closing one has been found. If a closing bracket shows up that doesn't " close anything, save it for later. while pos != -1 if !s:IsInStringOrComment(a:lnum, pos + 1) if line[pos] == '(' call add(opening.parentheses, {'type': '(', 'pos': pos}) elseif line[pos] == ')' if empty(opening.parentheses) call add(closing.parentheses, {'type': ')', 'pos': pos}) else let opening.parentheses = opening.parentheses[0:-2] endif elseif line[pos] == '{' call add(opening.braces, {'type': '{', 'pos': pos}) elseif line[pos] == '}' if empty(opening.braces) call add(closing.braces, {'type': '}', 'pos': pos}) else let opening.braces = opening.braces[0:-2] endif elseif line[pos] == '[' call add(opening.brackets, {'type': '[', 'pos': pos}) elseif line[pos] == ']' if empty(opening.brackets) call add(closing.brackets, {'type': ']', 'pos': pos}) else let opening.brackets = opening.brackets[0:-2] endif endif endif let pos = match(line, '[][(){}]', pos + 1) endwhile " Find the rightmost brackets, since they're the ones that are important in " both opening and closing cases let rightmost_opening = {'type': '(', 'pos': -1} let rightmost_closing = {'type': ')', 'pos': -1} for opening in opening.parentheses + opening.braces + opening.brackets if opening.pos > rightmost_opening.pos let rightmost_opening = opening endif endfor for closing in closing.parentheses + closing.braces + closing.brackets if closing.pos > rightmost_closing.pos let rightmost_closing = closing endif endfor return [rightmost_opening, rightmost_closing] endfunction function s:Match(lnum, regex) let col = match(getline(a:lnum), '\C'.a:regex) + 1 return col > 0 && !s:IsInStringOrComment(a:lnum, col) ? col : 0 endfunction function s:MatchLast(lnum, regex) let line = getline(a:lnum) let col = match(line, '.*\zs' . a:regex) while col != -1 && s:IsInStringOrComment(a:lnum, col) let line = strpart(line, 0, col) let col = match(line, '.*' . a:regex) endwhile return col + 1 endfunction " 4. FalconGetIndent Routine {{{1 " ============ function FalconGetIndent(...) " For the current line, use the first argument if given, else v:lnum let clnum = a:0 ? a:1 : v:lnum " Use zero indent at the top of the file if clnum == 0 return 0 endif let line = getline(clnum) let ind = -1 " If we got a closing bracket on an empty line, find its match and indent " according to it. For parentheses we indent to its column - 1, for the " others we indent to the containing line's MSL's level. Return -1 if fail. let col = matchend(line, '^\s*[]})]') if col > 0 && !s:IsInStringOrComment(clnum, col) call cursor(clnum, col) let bs = strpart('(){}[]', stridx(')}]', line[col - 1]) * 2, 2) if searchpair(escape(bs[0], '\['), '', bs[1], 'bW', s:skip_expr) > 0 if line[col-1]==')' && col('.') != col('$') - 1 let ind = virtcol('.') - 1 else let ind = indent(s:GetMSL(line('.'))) endif endif return ind endif " If we have a deindenting keyword, find its match and indent to its level. " TODO: this is messy if s:Match(clnum, s:falcon_deindent_keywords) call cursor(clnum, 1) if searchpair(s:end_start_regex, s:end_middle_regex, s:end_end_regex, 'bW', \ s:end_skip_expr) > 0 let msl = s:GetMSL(line('.')) let line = getline(line('.')) if strpart(line, 0, col('.') - 1) =~ '=\s*$' && \ strpart(line, col('.') - 1, 2) !~ 'do' let ind = virtcol('.') - 1 elseif getline(msl) =~ '=\s*\(#.*\)\=$' let ind = indent(line('.')) else let ind = indent(msl) endif endif return ind endif " If we are in a multi-line string or line-comment, don't do anything to it. if s:IsInString(clnum, matchend(line, '^\s*') + 1) return indent('.') endif " Find a non-blank, non-multi-line string line above the current line. let lnum = s:PrevNonBlankNonString(clnum - 1) " If the line is empty and inside a string, use the previous line. if line =~ '^\s*$' && lnum != prevnonblank(clnum - 1) return indent(prevnonblank(clnum)) endif " At the start of the file use zero indent. if lnum == 0 return 0 endif " Set up variables for the previous line. let line = getline(lnum) let ind = indent(lnum) " If the previous line ended with a block opening, add a level of indent. if s:Match(lnum, s:block_regex) return indent(s:GetMSL(lnum)) + shiftwidth() endif " If it contained hanging closing brackets, find the rightmost one, find its " match and indent according to that. if line =~ '[[({]' || line =~ '[])}]\s*\%(#.*\)\=$' let [opening, closing] = s:ExtraBrackets(lnum) if opening.pos != -1 if opening.type == '(' && searchpair('(', '', ')', 'bW', s:skip_expr) > 0 if col('.') + 1 == col('$') return ind + shiftwidth() else return virtcol('.') endif else let nonspace = matchend(line, '\S', opening.pos + 1) - 1 return nonspace > 0 ? nonspace : ind + shiftwidth() endif elseif closing.pos != -1 call cursor(lnum, closing.pos + 1) normal! % if s:Match(line('.'), s:falcon_indent_keywords) return indent('.') + shiftwidth() else return indent('.') endif else call cursor(clnum, vcol) end endif " If the previous line ended with an "end", match that "end"s beginning's " indent. let col = s:Match(lnum, '\%(^\|[^.:@$]\)\<end\>\s*\%(#.*\)\=$') if col > 0 call cursor(lnum, col) if searchpair(s:end_start_regex, '', s:end_end_regex, 'bW', \ s:end_skip_expr) > 0 let n = line('.') let ind = indent('.') let msl = s:GetMSL(n) if msl != n let ind = indent(msl) end return ind endif end let col = s:Match(lnum, s:falcon_indent_keywords) if col > 0 call cursor(lnum, col) let ind = virtcol('.') - 1 + shiftwidth() " TODO: make this better (we need to count them) (or, if a searchpair " fails, we know that something is lacking an end and thus we indent a " level if s:Match(lnum, s:end_end_regex) let ind = indent('.') endif return ind endif " Set up variables to use and search for MSL to the previous line. let p_lnum = lnum let lnum = s:GetMSL(lnum) " If the previous line wasn't a MSL and is continuation return its indent. " TODO: the || s:IsInString() thing worries me a bit. if p_lnum != lnum if s:Match(p_lnum, s:non_bracket_continuation_regex) || s:IsInString(p_lnum,strlen(line)) return ind endif endif " Set up more variables, now that we know we wasn't continuation bound. let line = getline(lnum) let msl_ind = indent(lnum) " If the MSL line had an indenting keyword in it, add a level of indent. " TODO: this does not take into account contrived things such as " module Foo; class Bar; end if s:Match(lnum, s:falcon_indent_keywords) let ind = msl_ind + shiftwidth() if s:Match(lnum, s:end_end_regex) let ind = ind - shiftwidth() endif return ind endif " If the previous line ended with [*+/.,-=], but wasn't a block ending or a " closing bracket, indent one extra level. if s:Match(lnum, s:non_bracket_continuation_regex) && !s:Match(lnum, '^\s*\([\])}]\|end\)') if lnum == p_lnum let ind = msl_ind + shiftwidth() else let ind = msl_ind endif return ind endif return ind endfunction " }}}1 let &cpo = s:cpo_save unlet s:cpo_save " vim: set sw=4 sts=4 et tw=80 :
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