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Diffstat (limited to 'runtime/indent/ruby.vim')
| -rw-r--r-- | runtime/indent/ruby.vim | 939 |
1 files changed, 939 insertions, 0 deletions
diff --git a/runtime/indent/ruby.vim b/runtime/indent/ruby.vim new file mode 100644 index 0000000..5c420d7 --- /dev/null +++ b/runtime/indent/ruby.vim @@ -0,0 +1,939 @@ +" Vim indent file +" Language: Ruby +" Maintainer: Andrew Radev <andrey.radev@gmail.com> +" Previous Maintainer: Nikolai Weibull <now at bitwi.se> +" URL: https://github.com/vim-ruby/vim-ruby +" Release Coordinator: Doug Kearns <dougkearns@gmail.com> +" Last Change: 2019 Jan 06 + +" 0. Initialization {{{1 +" ================= + +" Only load this indent file when no other was loaded. +if exists("b:did_indent") + finish +endif +let b:did_indent = 1 + +if !exists('g:ruby_indent_access_modifier_style') + " Possible values: "normal", "indent", "outdent" + let g:ruby_indent_access_modifier_style = 'normal' +endif + +if !exists('g:ruby_indent_assignment_style') + " Possible values: "variable", "hanging" + let g:ruby_indent_assignment_style = 'hanging' +endif + +if !exists('g:ruby_indent_block_style') + " Possible values: "expression", "do" + let g:ruby_indent_block_style = 'expression' +endif + +setlocal nosmartindent + +" Now, set up our indentation expression and keys that trigger it. +setlocal indentexpr=GetRubyIndent(v:lnum) +setlocal indentkeys=0{,0},0),0],!^F,o,O,e,:,. +setlocal indentkeys+==end,=else,=elsif,=when,=ensure,=rescue,==begin,==end +setlocal indentkeys+==private,=protected,=public + +" Only define the function once. +if exists("*GetRubyIndent") + finish +endif + +let s:cpo_save = &cpo +set cpo&vim + +" 1. Variables {{{1 +" ============ + +" Syntax group names that are strings. +let s:syng_string = + \ ['String', 'Interpolation', 'InterpolationDelimiter', 'NoInterpolation', 'StringEscape'] + +" Syntax group names that are strings or documentation. +let s:syng_stringdoc = s:syng_string + ['Documentation'] + +" Syntax group names that are or delimit strings/symbols/regexes or are comments. +let s:syng_strcom = s:syng_stringdoc + + \ ['Regexp', 'RegexpDelimiter', 'RegexpEscape', + \ 'Symbol', 'StringDelimiter', 'ASCIICode', 'Comment'] + +" Expression used to check whether we should skip a match with searchpair(). +let s:skip_expr = + \ 'index(map('.string(s:syng_strcom).',"hlID(''ruby''.v:val)"), synID(line("."),col("."),1)) >= 0' + +" Regex used for words that, at the start of a line, add a level of indent. +let s:ruby_indent_keywords = + \ '^\s*\zs\<\%(module\|class\|if\|for' . + \ '\|while\|until\|else\|elsif\|case\|when\|unless\|begin\|ensure\|rescue' . + \ '\|\%(\K\k*[!?]\?\)\=\s*def\):\@!\>' . + \ '\|\%([=,*/%+-]\|<<\|>>\|:\s\)\s*\zs' . + \ '\<\%(if\|for\|while\|until\|case\|unless\|begin\):\@!\>' + +" Regex used for words that, at the start of a line, remove a level of indent. +let s:ruby_deindent_keywords = + \ '^\s*\zs\<\%(ensure\|else\|rescue\|elsif\|when\|end\):\@!\>' + +" Regex that defines the start-match for the 'end' keyword. +"let s:end_start_regex = '\%(^\|[^.]\)\<\%(module\|class\|def\|if\|for\|while\|until\|case\|unless\|begin\|do\)\>' +" TODO: the do here should be restricted somewhat (only at end of line)? +let s:end_start_regex = + \ '\C\%(^\s*\|[=,*/%+\-|;{]\|<<\|>>\|:\s\)\s*\zs' . + \ '\<\%(module\|class\|if\|for\|while\|until\|case\|unless\|begin' . + \ '\|\%(\K\k*[!?]\?\)\=\s*def\):\@!\>' . + \ '\|\%(^\|[^.:@$]\)\@<=\<do:\@!\>' + +" Regex that defines the middle-match for the 'end' keyword. +let s:end_middle_regex = '\<\%(ensure\|else\|\%(\%(^\|;\)\s*\)\@<=\<rescue:\@!\>\|when\|elsif\):\@!\>' + +" Regex that defines the end-match for the 'end' keyword. +let s:end_end_regex = '\%(^\|[^.:@$]\)\@<=\<end:\@!\>' + +" Expression used for searchpair() call for finding match for 'end' keyword. +let s:end_skip_expr = s:skip_expr . + \ ' || (expand("<cword>") == "do"' . + \ ' && getline(".") =~ "^\\s*\\<\\(while\\|until\\|for\\):\\@!\\>")' + +" Regex that defines continuation lines, not including (, {, or [. +let s:non_bracket_continuation_regex = + \ '\%([\\.,:*/%+]\|\<and\|\<or\|\%(<%\)\@<![=-]\|:\@<![^[:alnum:]:][|&?]\|||\|&&\)\s*\%(#.*\)\=$' + +" Regex that defines continuation lines. +let s:continuation_regex = + \ '\%(%\@<![({[\\.,:*/%+]\|\<and\|\<or\|\%(<%\)\@<![=-]\|:\@<![^[:alnum:]:][|&?]\|||\|&&\)\s*\%(#.*\)\=$' + +" Regex that defines continuable keywords +let s:continuable_regex = + \ '\C\%(^\s*\|[=,*/%+\-|;{]\|<<\|>>\|:\s\)\s*\zs' . + \ '\<\%(if\|for\|while\|until\|unless\):\@!\>' + +" Regex that defines bracket continuations +let s:bracket_continuation_regex = '%\@<!\%([({[]\)\s*\%(#.*\)\=$' + +" Regex that defines dot continuations +let s:dot_continuation_regex = '%\@<!\.\s*\%(#.*\)\=$' + +" Regex that defines backslash continuations +let s:backslash_continuation_regex = '%\@<!\\\s*$' + +" Regex that defines end of bracket continuation followed by another continuation +let s:bracket_switch_continuation_regex = '^\([^(]\+\zs).\+\)\+'.s:continuation_regex + +" Regex that defines the first part of a splat pattern +let s:splat_regex = '[[,(]\s*\*\s*\%(#.*\)\=$' + +" Regex that describes all indent access modifiers +let s:access_modifier_regex = '\C^\s*\%(public\|protected\|private\)\s*\%(#.*\)\=$' + +" Regex that describes the indent access modifiers (excludes public) +let s:indent_access_modifier_regex = '\C^\s*\%(protected\|private\)\s*\%(#.*\)\=$' + +" 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*\%(#.*\)\=$' + +let s:block_continuation_regex = '^\s*[^])}\t ].*'.s:block_regex + +" Regex that describes a leading operator (only a method call's dot for now) +let s:leading_operator_regex = '^\s*[.]' + +" 2. GetRubyIndent Function {{{1 +" ========================= + +function! GetRubyIndent(...) abort + " 2.1. Setup {{{2 + " ---------- + + let indent_info = {} + + " The value of a single shift-width + if exists('*shiftwidth') + let indent_info.sw = shiftwidth() + else + let indent_info.sw = &sw + endif + + " For the current line, use the first argument if given, else v:lnum + let indent_info.clnum = a:0 ? a:1 : v:lnum + let indent_info.cline = getline(indent_info.clnum) + + " Set up variables for restoring position in file. Could use clnum here. + let indent_info.col = col('.') + + " 2.2. Work on the current line {{{2 + " ----------------------------- + let indent_callback_names = [ + \ 's:AccessModifier', + \ 's:ClosingBracketOnEmptyLine', + \ 's:BlockComment', + \ 's:DeindentingKeyword', + \ 's:MultilineStringOrLineComment', + \ 's:ClosingHeredocDelimiter', + \ 's:LeadingOperator', + \ ] + + for callback_name in indent_callback_names +" Decho "Running: ".callback_name + let indent = call(function(callback_name), [indent_info]) + + if indent >= 0 +" Decho "Match: ".callback_name." indent=".indent." info=".string(indent_info) + return indent + endif + endfor + + " 2.3. Work on the previous line. {{{2 + " ------------------------------- + + " Special case: we don't need the real s:PrevNonBlankNonString for an empty + " line inside a string. And that call can be quite expensive in that + " particular situation. + let indent_callback_names = [ + \ 's:EmptyInsideString', + \ ] + + for callback_name in indent_callback_names +" Decho "Running: ".callback_name + let indent = call(function(callback_name), [indent_info]) + + if indent >= 0 +" Decho "Match: ".callback_name." indent=".indent." info=".string(indent_info) + return indent + endif + endfor + + " Previous line number + let indent_info.plnum = s:PrevNonBlankNonString(indent_info.clnum - 1) + let indent_info.pline = getline(indent_info.plnum) + + let indent_callback_names = [ + \ 's:StartOfFile', + \ 's:AfterAccessModifier', + \ 's:ContinuedLine', + \ 's:AfterBlockOpening', + \ 's:AfterHangingSplat', + \ 's:AfterUnbalancedBracket', + \ 's:AfterLeadingOperator', + \ 's:AfterEndKeyword', + \ 's:AfterIndentKeyword', + \ ] + + for callback_name in indent_callback_names +" Decho "Running: ".callback_name + let indent = call(function(callback_name), [indent_info]) + + if indent >= 0 +" Decho "Match: ".callback_name." indent=".indent." info=".string(indent_info) + return indent + endif + endfor + + " 2.4. Work on the MSL line. {{{2 + " -------------------------- + let indent_callback_names = [ + \ 's:PreviousNotMSL', + \ 's:IndentingKeywordInMSL', + \ 's:ContinuedHangingOperator', + \ ] + + " Most Significant line based on the previous one -- in case it's a + " contination of something above + let indent_info.plnum_msl = s:GetMSL(indent_info.plnum) + + for callback_name in indent_callback_names +" Decho "Running: ".callback_name + let indent = call(function(callback_name), [indent_info]) + + if indent >= 0 +" Decho "Match: ".callback_name." indent=".indent." info=".string(indent_info) + return indent + endif + endfor + + " }}}2 + + " By default, just return the previous line's indent +" Decho "Default case matched" + return indent(indent_info.plnum) +endfunction + +" 3. Indenting Logic Callbacks {{{1 +" ============================ + +function! s:AccessModifier(cline_info) abort + let info = a:cline_info + + " If this line is an access modifier keyword, align according to the closest + " class declaration. + if g:ruby_indent_access_modifier_style == 'indent' + if s:Match(info.clnum, s:access_modifier_regex) + let class_lnum = s:FindContainingClass() + if class_lnum > 0 + return indent(class_lnum) + info.sw + endif + endif + elseif g:ruby_indent_access_modifier_style == 'outdent' + if s:Match(info.clnum, s:access_modifier_regex) + let class_lnum = s:FindContainingClass() + if class_lnum > 0 + return indent(class_lnum) + endif + endif + endif + + return -1 +endfunction + +function! s:ClosingBracketOnEmptyLine(cline_info) abort + let info = a:cline_info + + " 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(info.cline, '^\s*[]})]') + + if col > 0 && !s:IsInStringOrComment(info.clnum, col) + call cursor(info.clnum, col) + let closing_bracket = info.cline[col - 1] + let bracket_pair = strpart('(){}[]', stridx(')}]', closing_bracket) * 2, 2) + + if searchpair(escape(bracket_pair[0], '\['), '', bracket_pair[1], 'bW', s:skip_expr) > 0 + if closing_bracket == ')' && col('.') != col('$') - 1 + let ind = virtcol('.') - 1 + elseif g:ruby_indent_block_style == 'do' + let ind = indent(line('.')) + else " g:ruby_indent_block_style == 'expression' + let ind = indent(s:GetMSL(line('.'))) + endif + endif + + return ind + endif + + return -1 +endfunction + +function! s:BlockComment(cline_info) abort + " If we have a =begin or =end set indent to first column. + if match(a:cline_info.cline, '^\s*\%(=begin\|=end\)$') != -1 + return 0 + endif + return -1 +endfunction + +function! s:DeindentingKeyword(cline_info) abort + let info = a:cline_info + + " If we have a deindenting keyword, find its match and indent to its level. + " TODO: this is messy + if s:Match(info.clnum, s:ruby_deindent_keywords) + call cursor(info.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 s:IsAssignment(line, col('.')) && + \ strpart(line, col('.') - 1, 2) !~ 'do' + " assignment to case/begin/etc, on the same line + if g:ruby_indent_assignment_style == 'hanging' + " hanging indent + let ind = virtcol('.') - 1 + else + " align with variable + let ind = indent(line('.')) + endif + elseif g:ruby_indent_block_style == 'do' + " align to line of the "do", not to the MSL + let ind = indent(line('.')) + elseif getline(msl) =~ '=\s*\(#.*\)\=$' + " in the case of assignment to the MSL, align to the starting line, + " not to the MSL + let ind = indent(line('.')) + else + " align to the MSL + let ind = indent(msl) + endif + endif + return ind + endif + + return -1 +endfunction + +function! s:MultilineStringOrLineComment(cline_info) abort + let info = a:cline_info + + " If we are in a multi-line string or line-comment, don't do anything to it. + if s:IsInStringOrDocumentation(info.clnum, matchend(info.cline, '^\s*') + 1) + return indent(info.clnum) + endif + return -1 +endfunction + +function! s:ClosingHeredocDelimiter(cline_info) abort + let info = a:cline_info + + " If we are at the closing delimiter of a "<<" heredoc-style string, set the + " indent to 0. + if info.cline =~ '^\k\+\s*$' + \ && s:IsInStringDelimiter(info.clnum, 1) + \ && search('\V<<'.info.cline, 'nbW') > 0 + return 0 + endif + + return -1 +endfunction + +function! s:LeadingOperator(cline_info) abort + " If the current line starts with a leading operator, add a level of indent. + if s:Match(a:cline_info.clnum, s:leading_operator_regex) + return indent(s:GetMSL(a:cline_info.clnum)) + a:cline_info.sw + endif + return -1 +endfunction + +function! s:EmptyInsideString(pline_info) abort + " If the line is empty and inside a string (the previous line is a string, + " too), use the previous line's indent + let info = a:pline_info + + let plnum = prevnonblank(info.clnum - 1) + let pline = getline(plnum) + + if info.cline =~ '^\s*$' + \ && s:IsInStringOrComment(plnum, 1) + \ && s:IsInStringOrComment(plnum, strlen(pline)) + return indent(plnum) + endif + return -1 +endfunction + +function! s:StartOfFile(pline_info) abort + " At the start of the file use zero indent. + if a:pline_info.plnum == 0 + return 0 + endif + return -1 +endfunction + +function! s:AfterAccessModifier(pline_info) abort + let info = a:pline_info + + if g:ruby_indent_access_modifier_style == 'indent' + " If the previous line was a private/protected keyword, add a + " level of indent. + if s:Match(info.plnum, s:indent_access_modifier_regex) + return indent(info.plnum) + info.sw + endif + elseif g:ruby_indent_access_modifier_style == 'outdent' + " If the previous line was a private/protected/public keyword, add + " a level of indent, since the keyword has been out-dented. + if s:Match(info.plnum, s:access_modifier_regex) + return indent(info.plnum) + info.sw + endif + endif + return -1 +endfunction + +" Example: +" +" if foo || bar || +" baz || bing +" puts "foo" +" end +" +function! s:ContinuedLine(pline_info) abort + let info = a:pline_info + + let col = s:Match(info.plnum, s:ruby_indent_keywords) + if s:Match(info.plnum, s:continuable_regex) && + \ s:Match(info.plnum, s:continuation_regex) + if col > 0 && s:IsAssignment(info.pline, col) + if g:ruby_indent_assignment_style == 'hanging' + " hanging indent + let ind = col - 1 + else + " align with variable + let ind = indent(info.plnum) + endif + else + let ind = indent(s:GetMSL(info.plnum)) + endif + return ind + info.sw + info.sw + endif + return -1 +endfunction + +function! s:AfterBlockOpening(pline_info) abort + let info = a:pline_info + + " If the previous line ended with a block opening, add a level of indent. + if s:Match(info.plnum, s:block_regex) + if g:ruby_indent_block_style == 'do' + " don't align to the msl, align to the "do" + let ind = indent(info.plnum) + info.sw + else + let plnum_msl = s:GetMSL(info.plnum) + + if getline(plnum_msl) =~ '=\s*\(#.*\)\=$' + " in the case of assignment to the msl, align to the starting line, + " not to the msl + let ind = indent(info.plnum) + info.sw + else + let ind = indent(plnum_msl) + info.sw + endif + endif + + return ind + endif + + return -1 +endfunction + +function! s:AfterLeadingOperator(pline_info) abort + " If the previous line started with a leading operator, use its MSL's level + " of indent + if s:Match(a:pline_info.plnum, s:leading_operator_regex) + return indent(s:GetMSL(a:pline_info.plnum)) + endif + return -1 +endfunction + +function! s:AfterHangingSplat(pline_info) abort + let info = a:pline_info + + " If the previous line ended with the "*" of a splat, add a level of indent + if info.pline =~ s:splat_regex + return indent(info.plnum) + info.sw + endif + return -1 +endfunction + +function! s:AfterUnbalancedBracket(pline_info) abort + let info = a:pline_info + + " If the previous line contained unclosed opening brackets and we are still + " in them, find the rightmost one and add indent depending on the bracket + " type. + " + " If it contained hanging closing brackets, find the rightmost one, find its + " match and indent according to that. + if info.pline =~ '[[({]' || info.pline =~ '[])}]\s*\%(#.*\)\=$' + let [opening, closing] = s:ExtraBrackets(info.plnum) + + if opening.pos != -1 + if opening.type == '(' && searchpair('(', '', ')', 'bW', s:skip_expr) > 0 + if col('.') + 1 == col('$') + return indent(info.plnum) + info.sw + else + return virtcol('.') + endif + else + let nonspace = matchend(info.pline, '\S', opening.pos + 1) - 1 + return nonspace > 0 ? nonspace : indent(info.plnum) + info.sw + endif + elseif closing.pos != -1 + call cursor(info.plnum, closing.pos + 1) + normal! % + + if s:Match(line('.'), s:ruby_indent_keywords) + return indent('.') + info.sw + else + return indent(s:GetMSL(line('.'))) + endif + else + call cursor(info.clnum, info.col) + end + endif + + return -1 +endfunction + +function! s:AfterEndKeyword(pline_info) abort + let info = a:pline_info + " If the previous line ended with an "end", match that "end"s beginning's + " indent. + let col = s:Match(info.plnum, '\%(^\|[^.:@$]\)\<end\>\s*\%(#.*\)\=$') + if col > 0 + call cursor(info.plnum, 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 + return -1 +endfunction + +function! s:AfterIndentKeyword(pline_info) abort + let info = a:pline_info + let col = s:Match(info.plnum, s:ruby_indent_keywords) + + if col > 0 + call cursor(info.plnum, col) + let ind = virtcol('.') - 1 + info.sw + " 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(info.plnum, s:end_end_regex) + let ind = indent('.') + elseif s:IsAssignment(info.pline, col) + if g:ruby_indent_assignment_style == 'hanging' + " hanging indent + let ind = col + info.sw - 1 + else + " align with variable + let ind = indent(info.plnum) + info.sw + endif + endif + return ind + endif + + return -1 +endfunction + +function! s:PreviousNotMSL(msl_info) abort + let info = a:msl_info + + " If the previous line wasn't a MSL + if info.plnum != info.plnum_msl + " If previous line ends bracket and begins non-bracket continuation decrease indent by 1. + if s:Match(info.plnum, s:bracket_switch_continuation_regex) + " TODO (2016-10-07) Wrong/unused? How could it be "1"? + return indent(info.plnum) - 1 + " If previous line is a continuation return its indent. + " TODO: the || s:IsInString() thing worries me a bit. + elseif s:Match(info.plnum, s:non_bracket_continuation_regex) || s:IsInString(info.plnum, strlen(line)) + return indent(info.plnum) + endif + endif + + return -1 +endfunction + +function! s:IndentingKeywordInMSL(msl_info) abort + let info = a:msl_info + " 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 + let col = s:Match(info.plnum_msl, s:ruby_indent_keywords) + if col > 0 + let ind = indent(info.plnum_msl) + info.sw + if s:Match(info.plnum_msl, s:end_end_regex) + let ind = ind - info.sw + elseif s:IsAssignment(getline(info.plnum_msl), col) + if g:ruby_indent_assignment_style == 'hanging' + " hanging indent + let ind = col + info.sw - 1 + else + " align with variable + let ind = indent(info.plnum_msl) + info.sw + endif + endif + return ind + endif + return -1 +endfunction + +function! s:ContinuedHangingOperator(msl_info) abort + let info = a:msl_info + + " If the previous line ended with [*+/.,-=], but wasn't a block ending or a + " closing bracket, indent one extra level. + if s:Match(info.plnum_msl, s:non_bracket_continuation_regex) && !s:Match(info.plnum_msl, '^\s*\([\])}]\|end\)') + if info.plnum_msl == info.plnum + let ind = indent(info.plnum_msl) + info.sw + else + let ind = indent(info.plnum_msl) + endif + return ind + endif + + return -1 +endfunction + +" 4. Auxiliary Functions {{{1 +" ====================== + +function! s:IsInRubyGroup(groups, lnum, col) abort + let ids = map(copy(a:groups), 'hlID("ruby".v:val)') + return index(ids, synID(a:lnum, a:col, 1)) >= 0 +endfunction + +" Check if the character at lnum:col is inside a string, comment, or is ascii. +function! s:IsInStringOrComment(lnum, col) abort + return s:IsInRubyGroup(s:syng_strcom, a:lnum, a:col) +endfunction + +" Check if the character at lnum:col is inside a string. +function! s:IsInString(lnum, col) abort + return s:IsInRubyGroup(s:syng_string, a:lnum, a:col) +endfunction + +" Check if the character at lnum:col is inside a string or documentation. +function! s:IsInStringOrDocumentation(lnum, col) abort + return s:IsInRubyGroup(s:syng_stringdoc, a:lnum, a:col) +endfunction + +" Check if the character at lnum:col is inside a string delimiter +function! s:IsInStringDelimiter(lnum, col) abort + return s:IsInRubyGroup(['StringDelimiter'], a:lnum, a:col) +endfunction + +function! s:IsAssignment(str, pos) abort + return strpart(a:str, 0, a:pos - 1) =~ '=\s*$' +endfunction + +" Find line above 'lnum' that isn't empty, in a comment, or in a string. +function! s:PrevNonBlankNonString(lnum) abort + let in_block = 0 + let lnum = prevnonblank(a:lnum) + while lnum > 0 + " Go in and out of blocks comments as necessary. + " If the line isn't empty (with opt. comment) or in a string, end search. + let line = getline(lnum) + if line =~ '^=begin' + if in_block + let in_block = 0 + else + break + endif + elseif !in_block && line =~ '^=end' + let in_block = 1 + elseif !in_block && line !~ '^\s*#.*$' && !(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) abort + " Start on the line we're at and use its indent. + let msl = a:lnum + 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(msl, s:backslash_continuation_regex) && + \ s:Match(lnum, s:backslash_continuation_regex) + " If the current line doesn't end in a backslash, but the previous one + " does, look for that line's msl + " + " Example: + " foo = "bar" \ + " "baz" + " + let msl = lnum + elseif s:Match(msl, s:leading_operator_regex) + " If the current line starts with a leading operator, keep its indent + " and keep looking for an MSL. + let msl = lnum + elseif s:Match(lnum, s:splat_regex) + " If the above line looks like the "*" of a splat, use the current one's + " indentation. + " + " Example: + " Hash[* + " method_call do + " something + " + return msl + elseif s:Match(lnum, 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:dot_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 dot, keep going to see if the previous line is the + " start of another continuation. + " + " Example: + " parent. + " method_call { + " 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 lnum = s:PrevNonBlankNonString(lnum - 1) + endwhile + return msl +endfunction + +" Check if line 'lnum' has more opening brackets than closing ones. +function! s:ExtraBrackets(lnum) abort + 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) abort + let line = getline(a:lnum) + let offset = match(line, '\C'.a:regex) + let col = offset + 1 + + while offset > -1 && s:IsInStringOrComment(a:lnum, col) + let offset = match(line, '\C'.a:regex, offset + 1) + let col = offset + 1 + endwhile + + if offset > -1 + return col + else + return 0 + endif +endfunction + +" Locates the containing class/module's definition line, ignoring nested classes +" along the way. +" +function! s:FindContainingClass() abort + let saved_position = getpos('.') + + while searchpair(s:end_start_regex, s:end_middle_regex, s:end_end_regex, 'bW', + \ s:end_skip_expr) > 0 + if expand('<cword>') =~# '\<class\|module\>' + let found_lnum = line('.') + call setpos('.', saved_position) + return found_lnum + endif + endwhile + + call setpos('.', saved_position) + return 0 +endfunction + +" }}}1 + +let &cpo = s:cpo_save +unlet s:cpo_save + +" vim:set sw=2 sts=2 ts=8 et: |