vim-patch:2ed639abdc40

Update a few runtime files.
https://github.com/vim/vim/commit/2ed639abdc4000436115f378e28320b7bee38a6e

4 files changed, 488 insertions, 398 deletions

diff --git a/runtime/autoload/rubycomplete.vim b/runtime/autoload/rubycomplete.vim
index ea18470232..e8a1879668 100644
--- a/runtime/autoload/rubycomplete.vim
+++ b/runtime/autoload/rubycomplete.vim
@@ -3,7 +3,7 @@
 " Maintainer:		Mark Guzman <segfault@hasno.info>
 " URL:			https://github.com/vim-ruby/vim-ruby
 " Release Coordinator:	Doug Kearns <dougkearns@gmail.com>
-" Last Change:		2019 Jan 06
+" Last Change:		2019 Feb 25
 " ----------------------------------------------------------------------------
 "
 " Ruby IRB/Complete author: Keiju ISHITSUKA(keiju@ishitsuka.com)
@@ -53,6 +53,23 @@ if !exists("g:rubycomplete_include_objectspace")
 endif
 " }}} configuration failsafe initialization
 
+" {{{ regex patterns
+
+" Regex that defines the start-match for the 'end' keyword.
+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:\@!\>'
+
+" }}} regex patterns
+
 " {{{ vim-side support functions
 let s:rubycomplete_debug = 0
 
@@ -103,7 +120,7 @@ function! s:GetBufferRubyEntity( name, type, ... )
     endif
 
     let curpos = getpos(".")
-    let [enum,ecol] = searchpairpos( crex, '', '\(end\|}\)', 'W' )
+    let [enum,ecol] = searchpairpos( s:end_start_regex, s:end_middle_regex, s:end_end_regex, 'W' )
     call cursor(lastpos[1], lastpos[2])
 
     if lnum > enum
@@ -128,19 +145,28 @@ function! s:IsPosInClassDef(pos)
     return ret
 endfunction
 
+function! s:IsInComment(pos)
+    let stack = synstack(a:pos[0], a:pos[1])
+    if !empty(stack)
+        return synIDattr(stack[0], 'name') =~ 'ruby\%(.*Comment\|Documentation\)'
+    else
+        return 0
+    endif
+endfunction
+
 function! s:GetRubyVarType(v)
     let stopline = 1
     let vtp = ''
-    let pos = getpos('.')
+    let curpos = getpos('.')
     let sstr = '^\s*#\s*@var\s*'.escape(a:v, '*').'\>\s\+[^ \t]\+\s*$'
     let [lnum,lcol] = searchpos(sstr,'nb',stopline)
     if lnum != 0 && lcol != 0
-        call setpos('.',pos)
+        call setpos('.',curpos)
         let str = getline(lnum)
         let vtp = substitute(str,sstr,'\1','')
         return vtp
     endif
-    call setpos('.',pos)
+    call setpos('.',curpos)
     let ctors = '\(now\|new\|open\|get_instance'
     if exists('g:rubycomplete_rails') && g:rubycomplete_rails == 1 && s:rubycomplete_rails_loaded == 1
         let ctors = ctors.'\|find\|create'
@@ -150,9 +176,13 @@ function! s:GetRubyVarType(v)
 
     let fstr = '=\s*\([^ \t]\+.' . ctors .'\>\|[\[{"''/]\|%[xwQqr][(\[{@]\|[A-Za-z0-9@:\-()\.]\+...\?\|lambda\|&\)'
     let sstr = ''.escape(a:v, '*').'\>\s*[+\-*/]*'.fstr
-    let [lnum,lcol] = searchpos(sstr,'nb',stopline)
-    if lnum != 0 && lcol != 0
-        let str = matchstr(getline(lnum),fstr,lcol)
+    let pos = searchpos(sstr,'bW')
+    while pos != [0,0] && s:IsInComment(pos)
+        let pos = searchpos(sstr,'bW')
+    endwhile
+    if pos != [0,0]
+        let [lnum, col] = pos
+        let str = matchstr(getline(lnum),fstr,col)
         let str = substitute(str,'^=\s*','','')
 
         call setpos('.',pos)
@@ -174,7 +204,7 @@ function! s:GetRubyVarType(v)
         end
         return ''
     endif
-    call setpos('.',pos)
+    call setpos('.',curpos)
     return ''
 endfunction
 
@@ -671,11 +701,10 @@ class VimRubyCompletion
           methods.delete_if { |c| c.match( /'/ ) }
         end
 
-      when /^::([A-Z][^:\.\(]*)$/ # Absolute Constant or class methods
+      when /^::([A-Z][^:\.\(]*)?$/ # Absolute Constant or class methods
         dprint "const or cls"
         receiver = $1
-        methods = Object.constants
-        methods.grep(/^#{receiver}/).collect{|e| "::" + e}
+        methods = Object.constants.collect{ |c| c.to_s }.grep(/^#{receiver}/)
 
       when /^(((::)?[A-Z][^:.\(]*)+?)::?([^:.]*)$/ # Constant or class methods
         receiver = $1
@@ -684,13 +713,13 @@ class VimRubyCompletion
         load_buffer_class( receiver )
         load_buffer_module( receiver )
         begin
-          classes = eval("#{receiver}.constants")
-          #methods = eval("#{receiver}.methods")
+          constants = eval("#{receiver}.constants").collect{ |c| c.to_s }.grep(/^#{message}/)
+          methods = eval("#{receiver}.methods").collect{ |m| m.to_s }.grep(/^#{message}/)
         rescue Exception
           dprint "exception: %s" % $!
+          constants = []
           methods = []
         end
-        methods.grep(/^#{message}/).collect{|e| receiver + "::" + e}
 
       when /^(:[^:.]+)\.([^.]*)$/ # Symbol
         dprint "symbol"
diff --git a/runtime/ftplugin/ruby.vim b/runtime/ftplugin/ruby.vim
index 054c35e5fa..b4a8eaa0d8 100644
--- a/runtime/ftplugin/ruby.vim
+++ b/runtime/ftplugin/ruby.vim
@@ -3,7 +3,7 @@
 " Maintainer:		Tim Pope <vimNOSPAM@tpope.org>
 " URL:			https://github.com/vim-ruby/vim-ruby
 " Release Coordinator:	Doug Kearns <dougkearns@gmail.com>
-" Last Change:		2019 Jan 06
+" Last Change:		2019 Nov 06
 
 if (exists("b:did_ftplugin"))
   finish
@@ -24,20 +24,20 @@ if exists("loaded_matchit") && !exists("b:match_words")
   let b:match_ignorecase = 0
 
   let b:match_words =
-	\ '\<\%(if\|unless\|case\|while\|until\|for\|do\|class\|module\|def\|begin\)\>=\@!' .
+	\ '{\|\<\%(if\|unless\|case\|while\|until\|for\|do\|class\|module\|def\|=\@<!begin\)\>=\@!' .
 	\ ':' .
 	\ '\<\%(else\|elsif\|ensure\|when\|rescue\|break\|redo\|next\|retry\)\>' .
 	\ ':' .
-        \ '\%(^\|[^.\:@$]\)\@<=\<end\:\@!\>' .
-	\ ',{:},\[:\],(:)'
+        \ '}\|\%(^\|[^.\:@$=]\)\@<=\<end\:\@!\>' .
+        \ ',^=begin\>:^=end\>,' .
+	\ ',\[:\],(:)'
 
   let b:match_skip =
 	\ "synIDattr(synID(line('.'),col('.'),0),'name') =~ '" .
-	\ "\\<ruby\\%(String\\|StringDelimiter\\|ASCIICode\\|Escape\\|" .
-        \ "Regexp\\|RegexpDelimiter\\|" .
-	\ "Interpolation\\|NoInterpolation\\|Comment\\|Documentation\\|" .
-	\ "ConditionalModifier\\|RepeatModifier\\|OptionalDo\\|" .
-	\ "Function\\|BlockArgument\\|KeywordAsMethod\\|ClassVariable\\|" .
+	\ "\\<ruby\\%(String\\|.\+Delimiter\\|Character\\|.\+Escape\\|" .
+        \ "Regexp\\|Interpolation\\|Comment\\|Documentation\\|" .
+	\ "ConditionalModifier\\|RepeatModifier\\|RescueModifier\\|OptionalDo\\|" .
+	\ "MethodName\\|BlockArgument\\|KeywordAsMethod\\|ClassVariable\\|" .
 	\ "InstanceVariable\\|GlobalVariable\\|Symbol\\)\\>'"
 endif
 
@@ -87,7 +87,7 @@ endfunction
 
 function! s:build_path(path) abort
   let path = join(map(copy(a:path), 'v:val ==# "." ? "" : v:val'), ',')
-  if &g:path !~# '\v^\.%(,/%(usr|emx)/include)=,,$'
+  if &g:path !~# '\v^%(\.,)=%(/%(usr|emx)/include,)=,$'
     let path = substitute(&g:path,',,$',',','') . ',' . path
   endif
   return path
@@ -152,7 +152,7 @@ endif
 function! s:map(mode, flags, map) abort
   let from = matchstr(a:map, '\S\+')
   if empty(mapcheck(from, a:mode))
-    exe a:mode.'map' '<buffer>' a:map
+    exe a:mode.'map' '<buffer>' a:flags a:map
     let b:undo_ftplugin .= '|sil! '.a:mode.'unmap <buffer> '.from
   endif
 endfunction
@@ -311,13 +311,16 @@ function! s:synid() abort
 endfunction
 
 function! s:wrap_i(back,forward) abort
-  execute 'norm k'.a:forward
+  execute 'norm! k'
+  execute 'norm '.a:forward
   let line = line('.')
   execute 'norm '.a:back
   if line('.') == line - 1
     return s:wrap_a(a:back,a:forward)
   endif
-  execute 'norm jV'.a:forward.'k'
+  execute 'norm! jV'
+  execute 'norm '.a:forward
+  execute 'norm! k'
 endfunction
 
 function! s:wrap_a(back,forward) abort
@@ -330,11 +333,15 @@ function! s:wrap_a(back,forward) abort
     -
   endwhile
   if exists('after')
-    execute 'norm V'.a:forward.'j'
+    execute 'norm! V'
+    execute 'norm '.a:forward
+    execute 'norm! j'
   elseif line('.') > 1 && getline(line('.')-1) =~# '^\s*$'
-    execute 'norm kV'.a:forward
+    execute 'norm! kV'
+    execute 'norm '.a:forward
   else
-    execute 'norm V'.a:forward
+    execute 'norm! V'
+    execute 'norm '.a:forward
   endif
 endfunction
 
@@ -366,7 +373,6 @@ function! RubyCursorFile() abort
   endtry
   let pre = matchstr(strpart(getline('.'), 0, col('.')-1), '.*\f\@<!')
   let post = matchstr(strpart(getline('.'), col('.')), '\f\@!.*')
-  let ext = getline('.') =~# '^\s*\%(require\%(_relative\)\=\|autoload\)\>' && cfile !~# '\.rb$' ? '.rb' : ''
   if s:synid() ==# hlID('rubyConstant')
     let cfile = substitute(cfile,'\.\w\+[?!=]\=$','','')
     let cfile = substitute(cfile,'^::','','')
@@ -375,12 +381,15 @@ function! RubyCursorFile() abort
     let cfile = substitute(cfile,'\(\l\|\d\)\(\u\)','\1_\2', 'g')
     return tolower(cfile) . '.rb'
   elseif getline('.') =~# '^\s*require_relative\s*\(["'']\).*\1\s*$'
-    let cfile = expand('%:p:h') . '/' . matchstr(getline('.'),'\(["'']\)\zs.\{-\}\ze\1') . ext
+    let cfile = expand('%:p:h') . '/' . matchstr(getline('.'),'\(["'']\)\zs.\{-\}\ze\1')
+    let cfile .= cfile !~# '\.rb$' ? '.rb' : ''
   elseif getline('.') =~# '^\s*\%(require[( ]\|load[( ]\|autoload[( ]:\w\+,\)\s*\%(::\)\=File\.expand_path(\(["'']\)\.\./.*\1,\s*__FILE__)\s*$'
     let target = matchstr(getline('.'),'\(["'']\)\.\.\zs/.\{-\}\ze\1')
-    let cfile = expand('%:p:h') . target . ext
+    let cfile = expand('%:p:h') . target
+    let cfile .= cfile !~# '\.rb$' ? '.rb' : ''
   elseif getline('.') =~# '^\s*\%(require \|load \|autoload :\w\+,\)\s*\(["'']\).*\1\s*$'
-    let cfile = matchstr(getline('.'),'\(["'']\)\zs.\{-\}\ze\1') . ext
+    let cfile = matchstr(getline('.'),'\(["'']\)\zs.\{-\}\ze\1')
+    let cfile .= cfile !~# '\.rb$' ? '.rb' : ''
   elseif pre.post =~# '\<File.expand_path[( ].*[''"]\{2\}, *__FILE__\>' && cfile =~# '^\.\.'
     let cfile = expand('%:p:h') . strpart(cfile, 2)
   else
diff --git a/runtime/indent/ruby.vim b/runtime/indent/ruby.vim
index 5c420d7543..23b61fdfe0 100644
--- a/runtime/indent/ruby.vim
+++ b/runtime/indent/ruby.vim
@@ -4,7 +4,7 @@
 " 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
+" Last Change:		2019 Dec 08
 
 " 0. Initialization {{{1
 " =================
@@ -51,15 +51,27 @@ set cpo&vim
 
 " Syntax group names that are strings.
 let s:syng_string =
-      \ ['String', 'Interpolation', 'InterpolationDelimiter', 'NoInterpolation', 'StringEscape']
+      \ ['String', 'Interpolation', 'InterpolationDelimiter', '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']
+let s:syng_strcom = s:syng_stringdoc + [
+      \ 'Character',
+      \ 'Comment',
+      \ 'HeredocDelimiter',
+      \ 'PercentRegexpDelimiter',
+      \ 'PercentStringDelimiter',
+      \ 'PercentSymbolDelimiter',
+      \ 'Regexp',
+      \ 'RegexpCharClass',
+      \ 'RegexpDelimiter',
+      \ 'RegexpEscape',
+      \ 'StringDelimiter',
+      \ 'Symbol',
+      \ 'SymbolDelimiter',
+      \ ]
 
 " Expression used to check whether we should skip a match with searchpair().
 let s:skip_expr =
@@ -69,7 +81,7 @@ let s:skip_expr =
 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\):\@!\>' .
+      \   '\|\%(\K\k*[!?]\?\s\+\)\=def\):\@!\>' .
       \ '\|\%([=,*/%+-]\|<<\|>>\|:\s\)\s*\zs' .
       \    '\<\%(if\|for\|while\|until\|case\|unless\|begin\):\@!\>'
 
@@ -83,7 +95,7 @@ let s:ruby_deindent_keywords =
 let s:end_start_regex =
       \ '\C\%(^\s*\|[=,*/%+\-|;{]\|<<\|>>\|:\s\)\s*\zs' .
       \ '\<\%(module\|class\|if\|for\|while\|until\|case\|unless\|begin' .
-      \   '\|\%(\K\k*[!?]\?\)\=\s*def\):\@!\>' .
+      \   '\|\%(\K\k*[!?]\?\s\+\)\=def\):\@!\>' .
       \ '\|\%(^\|[^.:@$]\)\@<=\<do:\@!\>'
 
 " Regex that defines the middle-match for the 'end' keyword.
@@ -146,7 +158,7 @@ let s:block_regex =
 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*[.]'
+let s:leading_operator_regex = '^\s*\%(&\=\.\)'
 
 " 2. GetRubyIndent Function {{{1
 " =========================
@@ -695,7 +707,10 @@ 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)
+  return s:IsInRubyGroup(
+        \ ['HeredocDelimiter', 'PercentStringDelimiter', 'StringDelimiter'],
+        \ a:lnum, a:col
+        \ )
 endfunction
 
 function! s:IsAssignment(str, pos) abort
diff --git a/runtime/syntax/ruby.vim b/runtime/syntax/ruby.vim
index 8b88378e60..0de63d0ef3 100644
--- a/runtime/syntax/ruby.vim
+++ b/runtime/syntax/ruby.vim
@@ -3,7 +3,7 @@
 " Maintainer:		Doug Kearns <dougkearns@gmail.com>
 " URL:			https://github.com/vim-ruby/vim-ruby
 " Release Coordinator:	Doug Kearns <dougkearns@gmail.com>
-" Last Change:		2018 Jul 09
+" Last Change:		2019 Jul 13
 " ----------------------------------------------------------------------------
 "
 " Previous Maintainer:	Mirko Nasato
@@ -19,6 +19,11 @@ endif
 let s:cpo_sav = &cpo
 set cpo&vim
 
+" eRuby Config {{{1
+if exists('main_syntax') && main_syntax == 'eruby'
+  let b:ruby_no_expensive = 1
+endif
+
 " Folding Config {{{1
 if has("folding") && exists("ruby_fold")
   setlocal foldmethod=syntax
@@ -33,6 +38,10 @@ let s:foldable_groups = split(
       \	)
 
 function! s:foldable(...) abort
+  if index(s:foldable_groups, 'NONE') > -1
+    return 0
+  endif
+
   if index(s:foldable_groups, 'ALL') > -1
     return 1
   endif
@@ -44,9 +53,20 @@ function! s:foldable(...) abort
   endfor
 
   return 0
-endfunction " }}}
+endfunction
+
+function! s:run_syntax_fold(args) abort
+  let [_0, _1, groups, cmd; _] = matchlist(a:args, '\(["'']\)\(.\{-}\)\1\s\+\(.*\)')
+  if call('s:foldable', split(groups))
+    let cmd .= ' fold'
+  endif
+  exe cmd
+endfunction
+
+com! -nargs=* SynFold call s:run_syntax_fold(<q-args>)
 
-syn cluster rubyNotTop contains=@rubyExtendedStringSpecial,@rubyRegexpSpecial,@rubyDeclaration,rubyConditional,rubyExceptional,rubyMethodExceptional,rubyTodo,rubyModuleName,rubyClassName,rubySymbolDelimiter
+" Not-Top Cluster {{{1
+syn cluster rubyNotTop contains=@rubyCommentNotTop,@rubyStringNotTop,@rubyRegexpSpecial,@rubyDeclaration,@rubyExceptionHandler,@rubyClassOperator,rubyConditional,rubyModuleName,rubyClassName,rubySymbolDelimiter,rubyParentheses
 
 " Whitespace Errors {{{1
 if exists("ruby_space_errors")
@@ -59,427 +79,400 @@ if exists("ruby_space_errors")
 endif
 
 " Operators {{{1
-if exists("ruby_operators")
-  syn match  rubyOperator "[~!^|*/%+-]\|&\.\@!\|\%(class\s*\)\@<!<<\|<=>\|<=\|\%(<\|\<class\s\+\u\w*\s*\)\@<!<[^<]\@=\|===\|==\|=\~\|>>\|>=\|=\@1<!>\|\*\*\|\.\.\.\|\.\.\|::"
-  syn match  rubyOperator "->\|-=\|/=\|\*\*=\|\*=\|&&=\|&=\|&&\|||=\||=\|||\|%=\|+=\|!\~\|!="
-  syn region rubyBracketOperator matchgroup=rubyOperator start="\%(\w[?!]\=\|[]})]\)\@2<=\[\s*" end="\s*]" contains=ALLBUT,@rubyNotTop
-endif
 
-" Expression Substitution and Backslash Notation {{{1
-syn match rubyStringEscape "\\\\\|\\[abefnrstv]\|\\\o\{1,3}\|\\x\x\{1,2}"						    contained display
-syn match rubyStringEscape "\%(\\M-\\C-\|\\C-\\M-\|\\M-\\c\|\\c\\M-\|\\c\|\\C-\|\\M-\)\%(\\\o\{1,3}\|\\x\x\{1,2}\|\\\=\S\)" contained display
-syn match rubyQuoteEscape  "\\[\\']"											    contained display
+syn match rubyEnglishBooleanOperator "\<\%(and\|or\|not\)\>"
+
+if exists("ruby_operators") || exists("ruby_pseudo_operators")
+  syn match rubyDotOperator	   "\.\|&\."
+
+  syn match rubyTernaryOperator    "\%(\w\|[^\x00-\x7F]\)\@1<!?\|:"
+  syn match rubyArithmeticOperator "\*\*\|[*/%+]\|->\@!"
+  syn match rubyComparisonOperator "<=>\|<=\|<\|>=\|[-=]\@1<!>"
+  syn match rubyBitwiseOperator    "[~^|]\|&\.\@!\|<<\|>>"
+  syn match rubyBooleanOperator    "\%(\w\|[^\x00-\x7F]\)\@1<!!\|&&\|||"
+  syn match rubyRangeOperator	   "\.\.\.\="
+  syn match rubyAssignmentOperator "=>\@!\|-=\|/=\|\*\*=\|\*=\|&&=\|&=\|||=\||=\|%=\|+=\|>>=\|<<=\|\^="
+  syn match rubyAssignmentOperator "=>\@!" containedin=rubyBlockParameterList " TODO: this is inelegant
+  syn match rubyEqualityOperator   "===\|==\|!=\|!\~\|=\~"
+
+  syn region rubyBracketOperator matchgroup=rubyOperator start="\%(\%(\w\|[^\x00-\x7F]\)[?!]\=\|[]})]\)\@2<=\[" end="]" contains=ALLBUT,@rubyNotTop
+
+  syn match rubyScopeOperator	    "::"
+  syn match rubySuperClassOperator  "<"	 contained
+  syn match rubyEigenClassOperator  "<<" contained
+  syn match rubyLambdaOperator	    "->"
+  syn match rubySplatOperator	    "\%([[{(|,=]\_s*\)\@<=\*"
+  syn match rubySplatOperator	    "\%(^\|\s\)\@1<=\*\%(\h\|[^\x00-\x7F]\|[:$@[]\)\@="
+  syn match rubyDoubleSplatOperator "\%([{(|,]\_s*\)\@<=\*\*"
+  syn match rubyDoubleSplatOperator "\s\@1<=\*\*\%(\h\|[^\x00-\x7F]\|[:$@{]\)\@="
+  syn match rubyProcOperator	    "\%([[(|,]\_s*\)\@<=&"
+  syn match rubyProcOperator	    "\s\@1<=&\%(\h\|[^\x00-\x7F]\|[:$@]\|->\)\@="
+
+  syn cluster rubyProperOperator contains=rubyTernaryOperator,rubyArithmeticOperator,rubyComparisonOperator,rubyBitwiseOperator,rubyBooleanOperator,rubyRangeOperator,rubyAssignmentOperator,rubyEqualityOperator,rubyDefinedOperator,rubyEnglishBooleanOperator
+  syn cluster rubyClassOperator  contains=rubyEigenClassOperator,rubySuperClassOperator
+  syn cluster rubyPseudoOperator contains=rubyDotOperator,rubyScopeOperator,rubyEigenClassOperator,rubySuperClassOperator,rubyLambdaOperator,rubySplatOperator,rubyDoubleSplatOperator,rubyProcOperator
+  syn cluster rubyOperator	 contains=ruby.*Operator
+endif
 
+" String Interpolation and Backslash Notation {{{1
 syn region rubyInterpolation	      matchgroup=rubyInterpolationDelimiter start="#{" end="}" contained contains=ALLBUT,@rubyNotTop
-syn match  rubyInterpolation	      "#\%(\$\|@@\=\)\w\+"    display contained contains=rubyInterpolationDelimiter,rubyInstanceVariable,rubyClassVariable,rubyGlobalVariable,rubyPredefinedVariable
-syn match  rubyInterpolationDelimiter "#\ze\%(\$\|@@\=\)\w\+" display contained
-syn match  rubyInterpolation	      "#\$\%(-\w\|\W\)"       display contained contains=rubyInterpolationDelimiter,rubyPredefinedVariable,rubyInvalidVariable
-syn match  rubyInterpolationDelimiter "#\ze\$\%(-\w\|\W\)"    display contained
-syn region rubyNoInterpolation	      start="\\#{" end="}"	      contained
-syn match  rubyNoInterpolation	      "\\#{"		      display contained
-syn match  rubyNoInterpolation	      "\\#\%(\$\|@@\=\)\w\+"  display contained
-syn match  rubyNoInterpolation	      "\\#\$\W"		      display contained
+syn match  rubyInterpolation	      "#\$\%(-\w\|[!$&"'*+,./0:;<>?@\`~_]\|\w\+\)" display contained contains=rubyInterpolationDelimiter,@rubyGlobalVariable
+syn match  rubyInterpolation	      "#@@\=\w\+"				   display contained contains=rubyInterpolationDelimiter,rubyInstanceVariable,rubyClassVariable
+syn match  rubyInterpolationDelimiter "#\ze[$@]"				   display contained
+
+syn match rubyStringEscape "\\\_."											   contained display
+syn match rubyStringEscape "\\\o\{1,3}\|\\x\x\{1,2}"									   contained display
+syn match rubyStringEscape "\\u\%(\x\{4}\|{\x\{1,6}\%(\s\+\x\{1,6}\)*}\)"						   contained display
+syn match rubyStringEscape "\%(\\M-\\C-\|\\C-\\M-\|\\M-\\c\|\\c\\M-\|\\c\|\\C-\|\\M-\)\%(\\\o\{1,3}\|\\x\x\{1,2}\|\\\=.\)" contained display
+
+syn match rubyBackslashEscape "\\\\" contained display
+syn match rubyQuoteEscape     "\\'"  contained display
+syn match rubySpaceEscape     "\\ "  contained display
 
-syn match rubyDelimiterEscape	"\\[(<{\[)>}\]]" transparent display contained contains=NONE
+syn match rubyParenthesisEscape	  "\\[()]"  contained display
+syn match rubyCurlyBraceEscape	  "\\[{}]"  contained display
+syn match rubyAngleBracketEscape  "\\[<>]"  contained display
+syn match rubySquareBracketEscape "\\[[\]]" contained display
 
 syn region rubyNestedParentheses    start="("  skip="\\\\\|\\)"  matchgroup=rubyString end=")"	transparent contained
 syn region rubyNestedCurlyBraces    start="{"  skip="\\\\\|\\}"  matchgroup=rubyString end="}"	transparent contained
 syn region rubyNestedAngleBrackets  start="<"  skip="\\\\\|\\>"  matchgroup=rubyString end=">"	transparent contained
 syn region rubyNestedSquareBrackets start="\[" skip="\\\\\|\\\]" matchgroup=rubyString end="\]"	transparent contained
 
+syn cluster rubySingleCharEscape contains=rubyBackslashEscape,rubyQuoteEscape,rubySpaceEscape,rubyParenthesisEscape,rubyCurlyBraceEscape,rubyAngleBracketEscape,rubySquareBracketEscape
+syn cluster rubyNestedBrackets	 contains=rubyNested.\+
+syn cluster rubyStringSpecial	 contains=rubyInterpolation,rubyStringEscape
+syn cluster rubyStringNotTop	 contains=@rubyStringSpecial,@rubyNestedBrackets,@rubySingleCharEscape
+
 " Regular Expression Metacharacters {{{1
-" These are mostly Oniguruma ready
-syn region rubyRegexpComment	matchgroup=rubyRegexpSpecial   start="(?#"								  skip="\\)"  end=")"  contained
-syn region rubyRegexpParens	matchgroup=rubyRegexpSpecial   start="(\(?:\|?<\=[=!]\|?>\|?<[a-z_]\w*>\|?[imx]*-[imx]*:\=\|\%(?#\)\@!\)" skip="\\)"  end=")"  contained transparent contains=@rubyRegexpSpecial
-syn region rubyRegexpBrackets	matchgroup=rubyRegexpCharClass start="\[\^\="								  skip="\\\]" end="\]" contained transparent contains=rubyStringEscape,rubyRegexpEscape,rubyRegexpCharClass oneline
-syn match  rubyRegexpCharClass	"\\[DdHhSsWw]"	       contained display
-syn match  rubyRegexpCharClass	"\[:\^\=\%(alnum\|alpha\|ascii\|blank\|cntrl\|digit\|graph\|lower\|print\|punct\|space\|upper\|xdigit\):\]" contained
-syn match  rubyRegexpEscape	"\\[].*?+^$|\\/(){}[]" contained
-syn match  rubyRegexpQuantifier	"[*?+][?+]\="	       contained display
-syn match  rubyRegexpQuantifier	"{\d\+\%(,\d*\)\=}?\=" contained display
-syn match  rubyRegexpAnchor	"[$^]\|\\[ABbGZz]"     contained display
-syn match  rubyRegexpDot	"\."		       contained display
-syn match  rubyRegexpSpecial	"|"		       contained display
-syn match  rubyRegexpSpecial	"\\[1-9]\d\=\d\@!"     contained display
-syn match  rubyRegexpSpecial	"\\k<\%([a-z_]\w*\|-\=\d\+\)\%([+-]\d\+\)\=>" contained display
-syn match  rubyRegexpSpecial	"\\k'\%([a-z_]\w*\|-\=\d\+\)\%([+-]\d\+\)\='" contained display
-syn match  rubyRegexpSpecial	"\\g<\%([a-z_]\w*\|-\=\d\+\)>" contained display
-syn match  rubyRegexpSpecial	"\\g'\%([a-z_]\w*\|-\=\d\+\)'" contained display
-
-syn cluster rubyStringSpecial	      contains=rubyInterpolation,rubyNoInterpolation,rubyStringEscape
-syn cluster rubyExtendedStringSpecial contains=@rubyStringSpecial,rubyNestedParentheses,rubyNestedCurlyBraces,rubyNestedAngleBrackets,rubyNestedSquareBrackets
-syn cluster rubyRegexpSpecial	      contains=rubyInterpolation,rubyNoInterpolation,rubyStringEscape,rubyRegexpSpecial,rubyRegexpEscape,rubyRegexpBrackets,rubyRegexpCharClass,rubyRegexpDot,rubyRegexpQuantifier,rubyRegexpAnchor,rubyRegexpParens,rubyRegexpComment
-
-" Numbers and ASCII Codes {{{1
-syn match rubyASCIICode "\%(\w\|[]})\"'/]\)\@1<!\%(?\%(\\M-\\C-\|\\C-\\M-\|\\M-\\c\|\\c\\M-\|\\c\|\\C-\|\\M-\)\=\%(\\\o\{1,3}\|\\x\x\{1,2}\|\\\=\S\)\)"
-syn match rubyInteger	"\%(\%(\w\|[]})\"']\s*\)\@<!-\)\=\<0[xX]\x\+\%(_\x\+\)*r\=i\=\>"								display
-syn match rubyInteger	"\%(\%(\w\|[]})\"']\s*\)\@<!-\)\=\<\%(0[dD]\)\=\%(0\|[1-9]\d*\%(_\d\+\)*\)r\=i\=\>"						display
-syn match rubyInteger	"\%(\%(\w\|[]})\"']\s*\)\@<!-\)\=\<0[oO]\=\o\+\%(_\o\+\)*r\=i\=\>"								display
-syn match rubyInteger	"\%(\%(\w\|[]})\"']\s*\)\@<!-\)\=\<0[bB][01]\+\%(_[01]\+\)*r\=i\=\>"								display
-syn match rubyFloat	"\%(\%(\w\|[]})\"']\s*\)\@<!-\)\=\<\%(0\|[1-9]\d*\%(_\d\+\)*\)\.\d\+\%(_\d\+\)*r\=i\=\>"					display
-syn match rubyFloat	"\%(\%(\w\|[]})\"']\s*\)\@<!-\)\=\<\%(0\|[1-9]\d*\%(_\d\+\)*\)\%(\.\d\+\%(_\d\+\)*\)\=\%([eE][-+]\=\d\+\%(_\d\+\)*\)r\=i\=\>"	display
+syn region rubyRegexpComment	  matchgroup=rubyRegexpSpecial	 start="(?#"								    skip="\\\\\|\\)"  end=")"  contained
+syn region rubyRegexpParens	  matchgroup=rubyRegexpSpecial	 start="(\(?:\|?<\=[=!]\|?>\|?<[a-z_]\w*>\|?[imx]*-[imx]*:\=\|\%(?#\)\@!\)" skip="\\\\\|\\)"  end=")"  contained transparent contains=@rubyRegexpSpecial
+syn region rubyRegexpBrackets	  matchgroup=rubyRegexpCharClass start="\[\^\="								    skip="\\\\\|\\\]" end="\]" contained transparent contains=rubyRegexpBrackets,rubyStringEscape,rubyRegexpEscape,rubyRegexpCharClass,rubyRegexpIntersection oneline
+syn match  rubyRegexpCharClass	  "\\[DdHhRSsWw]"	 contained display
+syn match  rubyRegexpCharClass	  "\[:\^\=\%(alnum\|alpha\|ascii\|blank\|cntrl\|digit\|graph\|lower\|print\|punct\|space\|upper\|word\|xdigit\):\]" contained
+syn match  rubyRegexpCharClass	  "\\[pP]{^\=.\{-}}"	 contained display
+syn match  rubyRegexpEscape	  "\\[].*?+^$|\\/(){}[]" contained " see commit e477f10
+syn match  rubyRegexpQuantifier	  "[*?+][?+]\="		 contained display
+syn match  rubyRegexpQuantifier	  "{\d\+\%(,\d*\)\=}?\=" contained display
+syn match  rubyRegexpAnchor	  "[$^]\|\\[ABbGZz]"	 contained display
+syn match  rubyRegexpDot	  "\.\|\\X"		 contained display
+syn match  rubyRegexpIntersection "&&"			 contained display
+syn match  rubyRegexpSpecial	  "\\K"			 contained display
+syn match  rubyRegexpSpecial	  "|"			 contained display
+syn match  rubyRegexpSpecial	  "\\[1-9]\d\=\d\@!"	 contained display
+syn match  rubyRegexpSpecial	  "\\k<\%([a-z_]\w*\|-\=\d\+\)\%([+-]\d\+\)\=>" contained display
+syn match  rubyRegexpSpecial	  "\\k'\%([a-z_]\w*\|-\=\d\+\)\%([+-]\d\+\)\='" contained display
+syn match  rubyRegexpSpecial	  "\\g<\%([a-z_]\w*\|-\=\d\+\)>"		contained display
+syn match  rubyRegexpSpecial	  "\\g'\%([a-z_]\w*\|-\=\d\+\)'"		contained display
+
+syn cluster rubyRegexpSpecial contains=@rubyStringSpecial,rubyRegexpSpecial,rubyRegexpEscape,rubyRegexpBrackets,rubyRegexpCharClass,rubyRegexpDot,rubyRegexpQuantifier,rubyRegexpAnchor,rubyRegexpParens,rubyRegexpComment,rubyRegexpIntersection
+
+" Numbers {{{1
+syn match rubyInteger "\%(\%(\w\|[^\x00-\x7F]\|[]})\"']\s*\)\@<!-\)\=\<0[xX]\x\+\%(_\x\+\)*r\=i\=\>"							       display
+syn match rubyInteger "\%(\%(\w\|[^\x00-\x7F]\|[]})\"']\s*\)\@<!-\)\=\<\%(0[dD]\)\=\%(0\|[1-9]\d*\%(_\d\+\)*\)r\=i\=\>"					       display
+syn match rubyInteger "\%(\%(\w\|[^\x00-\x7F]\|[]})\"']\s*\)\@<!-\)\=\<0[oO]\=\o\+\%(_\o\+\)*r\=i\=\>"							       display
+syn match rubyInteger "\%(\%(\w\|[^\x00-\x7F]\|[]})\"']\s*\)\@<!-\)\=\<0[bB][01]\+\%(_[01]\+\)*r\=i\=\>"						       display
+syn match rubyFloat   "\%(\%(\w\|[^\x00-\x7F]\|[]})\"']\s*\)\@<!-\)\=\<\%(0\|[1-9]\d*\%(_\d\+\)*\)\.\d\+\%(_\d\+\)*r\=i\=\>"				       display
+syn match rubyFloat   "\%(\%(\w\|[^\x00-\x7F]\|[]})\"']\s*\)\@<!-\)\=\<\%(0\|[1-9]\d*\%(_\d\+\)*\)\%(\.\d\+\%(_\d\+\)*\)\=\%([eE][-+]\=\d\+\%(_\d\+\)*\)i\=\>" display
 
 " Identifiers {{{1
-syn match rubyLocalVariableOrMethod "\<[_[:lower:]][_[:alnum:]]*[?!=]\=" contains=NONE display transparent
-syn match rubyBlockArgument	    "&[_[:lower:]][_[:alnum:]]"		 contains=NONE display transparent
-
-syn match  rubyClassName	"\%(\%(^\|[^.]\)\.\s*\)\@<!\<\u\%(\w\|[^\x00-\x7F]\)*\>\%(\s*(\)\@!" contained
-syn match  rubyModuleName	"\%(\%(^\|[^.]\)\.\s*\)\@<!\<\u\%(\w\|[^\x00-\x7F]\)*\>\%(\s*(\)\@!" contained
-syn match  rubyConstant		"\%(\%(^\|[^.]\)\.\s*\)\@<!\<\u\%(\w\|[^\x00-\x7F]\)*\>\%(\s*(\)\@!"
-syn match  rubyClassVariable	"@@\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*" display
-syn match  rubyInstanceVariable "@\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*"	display
-syn match  rubyGlobalVariable	"$\%(\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*\|-.\)"
-syn match  rubySymbolDelimiter	":" contained
-syn match  rubySymbol		"[]})\"':]\@1<!:\%(\^\|\~@\|\~\|<<\|<=>\|<=\|<\|===\|[=!]=\|[=!]\~\|!@\|!\|>>\|>=\|>\||\|-@\|-\|/\|\[]=\|\[]\|\*\*\|\*\|&\|%\|+@\|+\|`\)" contains=rubySymbolDelimiter
-syn match  rubySymbol		"[]})\"':]\@1<!:\$\%(-.\|[`~<=>_,;:!?/.'"@$*\&+0]\)" contains=rubySymbolDelimiter
-syn match  rubySymbol		"[]})\"':]\@1<!:\%(\$\|@@\=\)\=\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*" contains=rubySymbolDelimiter
-syn match  rubySymbol		"[]})\"':]\@1<!:\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*\%([?!=]>\@!\)\=" contains=rubySymbolDelimiter
-
-if s:foldable(':')
-  syn region rubySymbol		matchgroup=rubySymbolDelimiter start="[]})\"':]\@1<!:'"  end="'"  skip="\\\\\|\\'"  contains=rubyQuoteEscape fold
-  syn region rubySymbol		matchgroup=rubySymbolDelimiter start="[]})\"':]\@1<!:\"" end="\"" skip="\\\\\|\\\"" contains=@rubyStringSpecial fold
-else
-  syn region rubySymbol		matchgroup=rubySymbolDelimiter start="[]})\"':]\@1<!:'"  end="'"  skip="\\\\\|\\'"  contains=rubyQuoteEscape
-  syn region rubySymbol		matchgroup=rubySymbolDelimiter start="[]})\"':]\@1<!:\"" end="\"" skip="\\\\\|\\\"" contains=@rubyStringSpecial
+syn match rubyClassName	       "\%(\%(^\|[^.]\)\.\s*\)\@<!\<[[:upper:]]\%(\w\|[^\x00-\x7F]\)*\>\%(\s*(\)\@!" contained
+syn match rubyModuleName       "\%(\%(^\|[^.]\)\.\s*\)\@<!\<[[:upper:]]\%(\w\|[^\x00-\x7F]\)*\>\%(\s*(\)\@!" contained
+syn match rubyConstant	       "\%(\%(^\|[^.]\)\.\s*\)\@<!\<[[:upper:]]\%(\w\|[^\x00-\x7F]\)*\>\%(\s*(\)\@!"
+syn match rubyClassVariable    "@@\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*" display
+syn match rubyInstanceVariable "@\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*"  display
+syn match rubyGlobalVariable   "$\%(\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*\|-.\)"
+syn match rubySymbolDelimiter  ":" contained
+syn match rubySymbol	       "[]})\"':]\@1<!:\%(\^\|\~@\|\~\|<<\|<=>\|<=\|<\|===\|[=!]=\|[=!]\~\|!@\|!\|>>\|>=\|>\||\|-@\|-\|/\|\[]=\|\[]\|\*\*\|\*\|&\|%\|+@\|+\|`\)" contains=rubySymbolDelimiter
+syn match rubySymbol	       "[]})\"':]\@1<!:\$\%(-.\|[`~<=>_,;:!?/.'"@$*\&+0]\)"			    contains=rubySymbolDelimiter
+syn match rubySymbol	       "[]})\"':]\@1<!:\%(\$\|@@\=\)\=\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*"  contains=rubySymbolDelimiter
+syn match rubySymbol	       "[]})\"':]\@1<!:\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*\%([?!=]>\@!\)\=" contains=rubySymbolDelimiter
+
+SynFold ':' syn region rubySymbol matchgroup=rubySymbolDelimiter start="[]})\"':]\@1<!:'"  end="'"  skip="\\\\\|\\'"  contains=rubyQuoteEscape,rubyBackslashEscape
+SynFold ':' syn region rubySymbol matchgroup=rubySymbolDelimiter start="[]})\"':]\@1<!:\"" end="\"" skip="\\\\\|\\\"" contains=@rubyStringSpecial
+
+syn match rubyCapitalizedMethod "\%(\%(^\|[^.]\)\.\s*\)\@<!\<\u\%(\w\|[^\x00-\x7F]\)*\>\%(\s*(\)\@="
+
+syn region rubyParentheses	  start="("				 end=")" contains=ALLBUT,@rubyNotTop containedin=rubyBlockParameterList
+syn region rubyBlockParameterList start="\%(\%(\<do\>\|{\)\_s*\)\@32<=|" end="|" contains=ALLBUT,@rubyNotTop,@rubyProperOperator
+
+if exists('ruby_global_variable_error')
+  syn match rubyGlobalVariableError "$[^A-Za-z_]"	display
+  syn match rubyGlobalVariableError "$-[^0FIKWadilpvw]" display
 endif
 
-syn match  rubyCapitalizedMethod	"\%(\%(^\|[^.]\)\.\s*\)\@<!\<\u\%(\w\|[^\x00-\x7F]\)*\>\%(\s*(\)*\s*(\@="
-
-syn match  rubyBlockParameter	  "\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*" contained
-syn region rubyBlockParameterList start="\%(\%(\<do\>\|{\)\_s*\)\@32<=|" end="|" oneline display contains=rubyBlockParameter
-
-syn match rubyInvalidVariable	 "$[^ A-Za-z_-]"
-syn match rubyPredefinedVariable #$[!$&"'*+,./0:;<=>?@\`~]#
-syn match rubyPredefinedVariable "$\d\+"										   display
-syn match rubyPredefinedVariable "$_\>"											   display
-syn match rubyPredefinedVariable "$-[0FIKadilpvw]\>"									   display
-syn match rubyPredefinedVariable "$\%(deferr\|defout\|stderr\|stdin\|stdout\)\>"					   display
-syn match rubyPredefinedVariable "$\%(DEBUG\|FILENAME\|KCODE\|LOADED_FEATURES\|LOAD_PATH\|PROGRAM_NAME\|SAFE\|VERBOSE\)\>" display
-syn match rubyPredefinedConstant "\%(\%(^\|[^.]\)\.\s*\)\@<!\<\%(ARGF\|ARGV\|ENV\|DATA\|FALSE\|NIL\|STDERR\|STDIN\|STDOUT\|TOPLEVEL_BINDING\|TRUE\)\>\%(\s*(\)\@!"
+syn match rubyPredefinedVariable #$[!$&"'*+,./0:;<>?@\`~]#
+syn match rubyPredefinedVariable "$\d\+"									    display
+syn match rubyPredefinedVariable "$_\>"										    display
+syn match rubyPredefinedVariable "$-[0FIWadilpvw]\>"								    display
+syn match rubyPredefinedVariable "$\%(stderr\|stdin\|stdout\)\>"						    display
+syn match rubyPredefinedVariable "$\%(DEBUG\|FILENAME\|LOADED_FEATURES\|LOAD_PATH\|PROGRAM_NAME\|SAFE\|VERBOSE\)\>" display
+syn match rubyPredefinedConstant "\%(\%(^\|[^.]\)\.\s*\)\@<!\<\%(ARGF\|ARGV\|ENV\|DATA\|STDERR\|STDIN\|STDOUT\|TOPLEVEL_BINDING\)\>\%(\s*(\)\@!"
 syn match rubyPredefinedConstant "\%(\%(^\|[^.]\)\.\s*\)\@<!\<\%(RUBY_\%(VERSION\|RELEASE_DATE\|PLATFORM\|PATCHLEVEL\|REVISION\|DESCRIPTION\|COPYRIGHT\|ENGINE\)\)\>\%(\s*(\)\@!"
 
-" Normal Regular Expression {{{1
-if s:foldable('/')
-  syn region rubyRegexp matchgroup=rubyRegexpDelimiter start="\%(\%(^\|\<\%(and\|or\|while\|until\|unless\|if\|elsif\|when\|not\|then\|else\)\|[;\~=!|&(,{[<>?:*+-]\)\s*\)\@<=/" end="/[iomxneus]*" skip="\\\\\|\\/" contains=@rubyRegexpSpecial fold
-  syn region rubyRegexp matchgroup=rubyRegexpDelimiter start="\%(\h\k*\s\+\)\@<=/\%([ \t=]\|$\)\@!" end="/[iomxneus]*" skip="\\\\\|\\/" contains=@rubyRegexpSpecial fold
-else
-  syn region rubyRegexp matchgroup=rubyRegexpDelimiter start="\%(\%(^\|\<\%(and\|or\|while\|until\|unless\|if\|elsif\|when\|not\|then\|else\)\|[;\~=!|&(,{[<>?:*+-]\)\s*\)\@<=/" end="/[iomxneus]*" skip="\\\\\|\\/" contains=@rubyRegexpSpecial
-  syn region rubyRegexp matchgroup=rubyRegexpDelimiter start="\%(\h\k*\s\+\)\@<=/\%([ \t=]\|$\)\@!" end="/[iomxneus]*" skip="\\\\\|\\/" contains=@rubyRegexpSpecial
-endif
-
-" Generalized Regular Expression {{{1
-if s:foldable('%')
-  syn region rubyRegexp matchgroup=rubyRegexpDelimiter start="%r\z([~`!@#$%^&*_\-+=|\:;"',.?/]\)" end="\z1[iomxneus]*" skip="\\\\\|\\\z1" contains=@rubyRegexpSpecial fold
-  syn region rubyRegexp matchgroup=rubyRegexpDelimiter start="%r{"				end="}[iomxneus]*"   skip="\\\\\|\\}"	 contains=@rubyRegexpSpecial fold
-  syn region rubyRegexp matchgroup=rubyRegexpDelimiter start="%r<"				end=">[iomxneus]*"   skip="\\\\\|\\>"	 contains=@rubyRegexpSpecial,rubyNestedAngleBrackets,rubyDelimiterEscape fold
-  syn region rubyRegexp matchgroup=rubyRegexpDelimiter start="%r\["				end="\][iomxneus]*"  skip="\\\\\|\\\]"	 contains=@rubyRegexpSpecial fold
-  syn region rubyRegexp matchgroup=rubyRegexpDelimiter start="%r("				end=")[iomxneus]*"   skip="\\\\\|\\)"	 contains=@rubyRegexpSpecial fold
-  syn region rubyRegexp matchgroup=rubyRegexpDelimiter start="%r\z(\s\)"				end="\z1[iomxneus]*" skip="\\\\\|\\\z1" contains=@rubyRegexpSpecial fold
-else
-  syn region rubyRegexp matchgroup=rubyRegexpDelimiter start="%r\z([~`!@#$%^&*_\-+=|\:;"',.?/]\)" end="\z1[iomxneus]*" skip="\\\\\|\\\z1" contains=@rubyRegexpSpecial
-  syn region rubyRegexp matchgroup=rubyRegexpDelimiter start="%r{"				end="}[iomxneus]*"   skip="\\\\\|\\}"	 contains=@rubyRegexpSpecial
-  syn region rubyRegexp matchgroup=rubyRegexpDelimiter start="%r<"				end=">[iomxneus]*"   skip="\\\\\|\\>"	 contains=@rubyRegexpSpecial,rubyNestedAngleBrackets,rubyDelimiterEscape
-  syn region rubyRegexp matchgroup=rubyRegexpDelimiter start="%r\["				end="\][iomxneus]*"  skip="\\\\\|\\\]"	 contains=@rubyRegexpSpecial
-  syn region rubyRegexp matchgroup=rubyRegexpDelimiter start="%r("				end=")[iomxneus]*"   skip="\\\\\|\\)"	 contains=@rubyRegexpSpecial
-  syn region rubyRegexp matchgroup=rubyRegexpDelimiter start="%r\z(\s\)"				end="\z1[iomxneus]*" skip="\\\\\|\\\z1" contains=@rubyRegexpSpecial
-endif
-
-" Normal String {{{1
+" Deprecated/removed in 1.9
+syn match rubyPredefinedVariable "$="
+syn match rubyPredefinedVariable "$-K\>"		  display
+syn match rubyPredefinedVariable "$\%(deferr\|defout\)\>" display
+syn match rubyPredefinedVariable "$KCODE\>"		  display
+" Deprecated/removed in 2.4
+syn match rubyPredefinedConstant "\%(\%(^\|[^.]\)\.\s*\)\@<!\<\%(FALSE\|NIL\|TRUE\)\>\%(\s*(\)\@!"
+
+syn cluster rubyGlobalVariable contains=rubyGlobalVariable,rubyPredefinedVariable,rubyGlobalVariableError
+
+" Normal Regular Expressions {{{1
+SynFold '/' syn region rubyRegexp matchgroup=rubyRegexpDelimiter start="\%(\%(^\|\<\%(and\|or\|while\|until\|unless\|if\|elsif\|when\|not\|then\|else\)\|[;\~=!|&(,{[<>?:*+-]\)\s*\)\@<=/" end="/[iomxneus]*" skip="\\\\\|\\/" contains=@rubyRegexpSpecial nextgroup=@rubyModifier skipwhite
+SynFold '/' syn region rubyRegexp matchgroup=rubyRegexpDelimiter start="\%(\%(\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*\)\s\+\)\@<=/\%(=\|\_s\)\@!"					   end="/[iomxneus]*" skip="\\\\\|\\/" contains=@rubyRegexpSpecial nextgroup=@rubyModifier skipwhite
+
+" Generalized Regular Expressions {{{1
+SynFold '%' syn region rubyRegexp matchgroup=rubyPercentRegexpDelimiter start="%r\z([~`!@#$%^&*_\-+=|\:;"',.?/]\)" end="\z1[iomxneus]*" skip="\\\\\|\\\z1" contains=@rubyRegexpSpecial nextgroup=@rubyModifier skipwhite
+SynFold '%' syn region rubyRegexp matchgroup=rubyPercentRegexpDelimiter start="%r{"				   end="}[iomxneus]*"	skip="\\\\\|\\}"   contains=@rubyRegexpSpecial
+SynFold '%' syn region rubyRegexp matchgroup=rubyPercentRegexpDelimiter start="%r<"				   end=">[iomxneus]*"	skip="\\\\\|\\>"   contains=@rubyRegexpSpecial,rubyNestedAngleBrackets
+SynFold '%' syn region rubyRegexp matchgroup=rubyPercentRegexpDelimiter start="%r\["				   end="\][iomxneus]*"	skip="\\\\\|\\\]"  contains=@rubyRegexpSpecial
+SynFold '%' syn region rubyRegexp matchgroup=rubyPercentRegexpDelimiter start="%r("				   end=")[iomxneus]*"	skip="\\\\\|\\)"   contains=@rubyRegexpSpecial
+SynFold '%' syn region rubyRegexp matchgroup=rubyPercentRegexpDelimiter start="%r\z(\s\)"			   end="\z1[iomxneus]*" skip="\\\\\|\\\z1" contains=@rubyRegexpSpecial
+
+" Characters {{{1
+syn match rubyCharacter "\%(\w\|[^\x00-\x7F]\|[]})\"'/]\)\@1<!\%(?\%(\\M-\\C-\|\\C-\\M-\|\\M-\\c\|\\c\\M-\|\\c\|\\C-\|\\M-\)\=\%(\\\o\{1,3}\|\\x\x\{1,2}\|\\[[:space:]]\|\\\=[^[:space:]]\)\)"
+syn match rubyCharacter "\%(\w\|[^\x00-\x7F]\|[]})\"'/]\)\@1<!?\\u\%(\x\{4}\|{\x\{1,6}}\)"
+
+" Normal Strings {{{1
 let s:spell_cluster = exists('ruby_spellcheck_strings') ? ',@Spell' : ''
-exe 'syn region rubyString matchgroup=rubyStringDelimiter start="\"" end="\"" skip="\\\\\|\\\"" ' .
-      \ (s:foldable('%') ? 'fold' : '') . ' contains=@rubyStringSpecial' . s:spell_cluster
-exe 'syn region rubyString matchgroup=rubyStringDelimiter start="''" end="''" skip="\\\\\|\\''" ' .
-      \ (s:foldable('%') ? 'fold' : '') . ' contains=rubyQuoteEscape'	 . s:spell_cluster
+let s:fold_arg	    = s:foldable('string')		? ' fold'   : ''
+exe 'syn region rubyString matchgroup=rubyStringDelimiter start="\"" end="\"" skip="\\\\\|\\\""  contains=@rubyStringSpecial'		       . s:spell_cluster . s:fold_arg
+exe 'syn region rubyString matchgroup=rubyStringDelimiter start="''" end="''" skip="\\\\\|\\''"  contains=rubyQuoteEscape,rubyBackslashEscape' . s:spell_cluster . s:fold_arg
+unlet s:spell_cluster s:fold_arg
 
 " Shell Command Output {{{1
-if s:foldable('%')
-  syn region rubyString matchgroup=rubyStringDelimiter start="`" end="`" skip="\\\\\|\\`" contains=@rubyStringSpecial fold
-else