Update a few runtime files.

8 files changed, 504 insertions, 413 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/doc/pi_logipat.txt b/runtime/doc/pi_logipat.txt
index 8d33a565ac..23db48700e 100644
--- a/runtime/doc/pi_logipat.txt
+++ b/runtime/doc/pi_logipat.txt
@@ -41,7 +41,6 @@ Copyright: (c) 2004-2015 by Charles E. Campbell	*logiPat-copyright*
 		is performed and echoed onto the display.
 
 	:LogiPatFlags {search flags}			*LogiPat-flags*
-		:LogiPatFlags {search flags}
 		LogiPat uses the |search()| command.  The flags
 		passed to that call to search() may be specified
 		by the :LogiPatFlags command.
@@ -105,7 +104,7 @@ Copyright: (c) 2004-2015 by Charles E. Campbell	*logiPat-copyright*
 
 
 ==============================================================================
-3. LogiPat History					*logiPat-history*
+5. LogiPat History					*logiPat-history*
 
 	v4 Jun 22, 2015 * LogiPat has been picked up by Bram M for standard
 			  plugin distribution; hence the name change
diff --git a/runtime/doc/pi_netrw.txt b/runtime/doc/pi_netrw.txt
index 94dbfa5503..c271c5f0f6 100644
--- a/runtime/doc/pi_netrw.txt
+++ b/runtime/doc/pi_netrw.txt
@@ -1,4 +1,4 @@
-*pi_netrw.txt*  For Vim version 8.1.  Last change: 2019 Nov 30
+*pi_netrw.txt*  For Vim version 8.1.  Last change: 2019 Dec 09
 
 	    ------------------------------------------------
 	    NETRW REFERENCE MANUAL    by Charles E. Campbell
@@ -1184,7 +1184,7 @@ One may easily "bookmark" the currently browsed directory by using >
 								*.netrwbook*
 Bookmarks are retained in between sessions of vim in a file called .netrwbook
 as a |List|, which is typically stored in the first directory on the user's
-|'runtimepath'|; entries are kept in sorted order.
+runtimepath'; entries are kept in sorted order.
 
 If there are marked files and/or directories, mb will add them to the bookmark
 list.
diff --git a/runtime/doc/todo.txt b/runtime/doc/todo.txt
index f709155ccd..cf2cc80b08 100644
--- a/runtime/doc/todo.txt
+++ b/runtime/doc/todo.txt
@@ -1,4 +1,4 @@
-*todo.txt*      For Vim version 8.1.  Last change: 2019 Dec 07
+*todo.txt*      For Vim version 8.1.  Last change: 2019 Dec 08
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -118,6 +118,8 @@ E290, E292, E362, E366, E450, E451, E452,
 E453, E454, E460, E489, E491, E565, E578, E610, E611, E653,
 E654, E856, E857, E860, E861, E863, E889, E900
 
+Patch to move duplicated code to a function. (Yegappan Lakshmanan, #5330)
+
 Running test_gui and test_gui_init with Motif sometimes kills the window
 manager.  Problem with Motif? Now test_gui crashes in submenu_change().
 Athena is OK.
diff --git a/runtime/doc/version8.txt b/runtime/doc/version8.txt
index 7aeada537c..c13fa10d08 100644
--- a/runtime/doc/version8.txt
+++ b/runtime/doc/version8.txt
@@ -1,4 +1,4 @@
-*version8.txt*  For Vim version 8.1.  Last change: 2019 Dec 08
+*version8.txt*  For Vim version 8.1.  Last change: 2019 Dec 09
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -25831,14 +25831,14 @@ window.  This also works for normal windows.
 Text properties					*new-text-properties*
 ---------------
 
-Text properties give a plugin author flexibility what to highlight.  This can
-be used with an external asynchronous parser to do syntax highlighting.  Or
-to highlight text in a popup window.  The text properties stick with the text
-when characters are deleted or inserted, which makes them also useful as text
-markers. See |text-properties|.
+Text properties give a plugin author flexibility about what to highlight.
+This can be used with an external asynchronous parser to do syntax
+highlighting.  Or to highlight text in a popup window.  The text properties
+stick with the text when characters are deleted or inserted, which makes them
+also useful as text markers. See |text-properties|.
 
 The listener functions have been added to report text changes to a server so
-that it can dynamically update highligting, mark syntax errors and the like.
+that it can dynamically update highlighting, mark syntax errors and the like.
 See |listener_add()|.
 
 
@@ -39746,7 +39746,7 @@ Files:	    src/testdir/test_exit.vim, src/ex_docmd.c
 
 Patch 8.1.2198
 Problem:    Crash when using :center in autocommand.
-Solution:   Bail out early for an empty line. (Dominique pelle, closes #5095)
+Solution:   Bail out early for an empty line. (Dominique Pelle, closes #5095)
 Files:	    src/ex_cmds.c, src/testdir/test_textformat.vim
 
 Patch 8.1.2199
@@ -40610,7 +40610,7 @@ Solution:   Make sure long line does not overflow IObuff. (Dominique Pelle,
 Files:	    src/quickfix.c, src/testdir/test_quickfix.vim
 
 Patch 8.1.2341
-Problem:    Not so easy to interrupt a script programatically.
+Problem:    Not so easy to interrupt a script programmatically.
 Solution:   Add the interrupt() function. (Yasuhiro Matsumoto, closes #2834)
 Files:	    runtime/doc/eval.txt, src/evalfunc.c, src/ex_eval.c,
             src/testdir/Make_all.mak, src/testdir/test_interrupt.vim
@@ -41039,7 +41039,7 @@ Solution:   Free the old title.  Don't copy expr_line.
 Files:	    src/term.c, src/os_unix.c, src/register.c
 
 Patch 8.1.2407
-Problem:    proto file and dependenciess outdated.
+Problem:    proto file and dependencies outdated.
 Solution:   Update proto files and dependencies.
 Files:	    src/Makefile, src/proto/bufwrite.pro, src/proto/cmdhist.pro,
             src/proto/optionstr.pro, src/proto/popupwin.pro,
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
-  syn region rubyString matchgroup=rubyStringDelimiter start="`" end="`" skip="\\\\\|\\`" contains=@rubyStringSpecial
-endif
+SynFold 'string' syn region rubyString matchgroup=rubyStringDelimiter start="`" end="`" skip="\\\\\|\\`" contains=@rubyStringSpecial
 
-" Generalized Single Quoted String, Symbol and Array of Strings {{{1
-if s:foldable('%')
-  syn region rubyString matchgroup=rubyStringDelimiter start="%[qw]\z([~`!@#$%^&*_\-+=|\:;"',.?/]\)" end="\z1" skip="\\\\\|\\\z1" fold
-  syn region rubyString matchgroup=rubyStringDelimiter start="%[qw]{"				     end="}"   skip="\\\\\|\\}"	  fold contains=rubyNestedCurlyBraces,rubyDelimiterEscape
-  syn region rubyString matchgroup=rubyStringDelimiter start="%[qw]<"				     end=">"   skip="\\\\\|\\>"	  fold contains=rubyNestedAngleBrackets,rubyDelimiterEscape
-  syn region rubyString matchgroup=rubyStringDelimiter start="%[qw]\["				     end="\]"  skip="\\\\\|\\\]"  fold contains=rubyNestedSquareBrackets,rubyDelimiterEscape
-  syn region rubyString matchgroup=rubyStringDelimiter start="%[qw]("				     end=")"   skip="\\\\\|\\)"	  fold contains=rubyNestedParentheses,rubyDelimiterEscape
-  syn region rubyString matchgroup=rubyStringDelimiter start="%q\z(\s\)"			     end="\z1" skip="\\\\\|\\\z1" fold
-  syn region rubySymbol matchgroup=rubySymbolDelimiter start="%s\z([~`!@#$%^&*_\-+=|\:;"',.?/]\)"    end="\z1" skip="\\\\\|\\\z1" fold
-  syn region rubySymbol matchgroup=rubySymbolDelimiter start="%s{"				     end="}"   skip="\\\\\|\\}"	  fold contains=rubyNestedCurlyBraces,rubyDelimiterEscape
-  syn region rubySymbol matchgroup=rubySymbolDelimiter start="%s<"				     end=">"   skip="\\\\\|\\>"	  fold contains=rubyNestedAngleBrackets,rubyDelimiterEscape
-  syn region rubySymbol matchgroup=rubySymbolDelimiter start="%s\["				     end="\]"  skip="\\\\\|\\\]"  fold contains=rubyNestedSquareBrackets,rubyDelimiterEscape
-  syn region rubySymbol matchgroup=rubySymbolDelimiter start="%s("				     end=")"   skip="\\\\\|\\)"	  fold contains=rubyNestedParentheses,rubyDelimiterEscape
-  syn region rubyString matchgroup=rubyStringDelimiter start="%s\z(\s\)"			     end="\z1" skip="\\\\\|\\\z1" fold
-else
-  syn region rubyString matchgroup=rubyStringDelimiter start="%[qw]\z([~`!@#$%^&*_\-+=|\:;"',.?/]\)" end="\z1" skip="\\\\\|\\\z1"
-  syn region rubyString matchgroup=rubyStringDelimiter start="%[qw]{"				     end="}"   skip="\\\\\|\\}"	  contains=rubyNestedCurlyBraces,rubyDelimiterEscape
-  syn region rubyString matchgroup=rubyStringDelimiter start="%[qw]<"				     end=">"   skip="\\\\\|\\>"	  contains=rubyNestedAngleBrackets,rubyDelimiterEscape
-  syn region rubyString matchgroup=rubyStringDelimiter start="%[qw]\["				     end="\]"  skip="\\\\\|\\\]"  contains=rubyNestedSquareBrackets,rubyDelimiterEscape
-  syn region rubyString matchgroup=rubyStringDelimiter start="%[qw]("				     end=")"   skip="\\\\\|\\)"	  contains=rubyNestedParentheses,rubyDelimiterEscape
-  syn region rubyString matchgroup=rubyStringDelimiter start="%q\z(\s\)"			     end="\z1" skip="\\\\\|\\\z1"
-  syn region rubySymbol matchgroup=rubySymbolDelimiter start="%s\z([~`!@#$%^&*_\-+=|\:;"',.?/]\)"    end="\z1" skip="\\\\\|\\\z1"
-  syn region rubySymbol matchgroup=rubySymbolDelimiter start="%s{"				     end="}"   skip="\\\\\|\\}"	  contains=rubyNestedCurlyBraces,rubyDelimiterEscape
-  syn region rubySymbol matchgroup=rubySymbolDelimiter start="%s<"				     end=">"   skip="\\\\\|\\>"	  contains=rubyNestedAngleBrackets,rubyDelimiterEscape
-  syn region rubySymbol matchgroup=rubySymbolDelimiter start="%s\["				     end="\]"  skip="\\\\\|\\\]"  contains=rubyNestedSquareBrackets,rubyDelimiterEscape
-  syn region rubySymbol matchgroup=rubySymbolDelimiter start="%s("				     end=")"   skip="\\\\\|\\)"	  contains=rubyNestedParentheses,rubyDelimiterEscape
-  syn region rubyString matchgroup=rubyStringDelimiter start="%s\z(\s\)"			     end="\z1" skip="\\\\\|\\\z1"
-endif
+" Generalized Single Quoted Strings, Symbols, Array of Strings and Array of Symbols {{{1
 
-" Generalized Double Quoted String and Array of Strings and Shell Command Output {{{1
-" Note: %= is not matched here as the beginning of a double quoted string
-if s:foldable('%')
-  syn region rubyString matchgroup=rubyStringDelimiter start="%\z([~`!@#$%^&*_\-+|\:;"',.?/]\)"	      end="\z1" skip="\\\\\|\\\z1" contains=@rubyStringSpecial fold
-  syn region rubyString matchgroup=rubyStringDelimiter start="%[QWx]\z([~`!@#$%^&*_\-+=|\:;"',.?/]\)" end="\z1" skip="\\\\\|\\\z1" contains=@rubyStringSpecial fold
-  syn region rubyString matchgroup=rubyStringDelimiter start="%[QWx]\={"			      end="}"	skip="\\\\\|\\}"   contains=@rubyStringSpecial,rubyNestedCurlyBraces,rubyDelimiterEscape    fold
-  syn region rubyString matchgroup=rubyStringDelimiter start="%[QWx]\=<"			      end=">"	skip="\\\\\|\\>"   contains=@rubyStringSpecial,rubyNestedAngleBrackets,rubyDelimiterEscape  fold
-  syn region rubyString matchgroup=rubyStringDelimiter start="%[QWx]\=\["			      end="\]"	skip="\\\\\|\\\]"  contains=@rubyStringSpecial,rubyNestedSquareBrackets,rubyDelimiterEscape fold
-  syn region rubyString matchgroup=rubyStringDelimiter start="%[QWx]\=("			      end=")"	skip="\\\\\|\\)"   contains=@rubyStringSpecial,rubyNestedParentheses,rubyDelimiterEscape    fold
-  syn region rubyString matchgroup=rubyStringDelimiter start="%[Qx]\z(\s\)"			      end="\z1" skip="\\\\\|\\\z1" contains=@rubyStringSpecial fold
-else
-  syn region rubyString matchgroup=rubyStringDelimiter start="%\z([~`!@#$%^&*_\-+|\:;"',.?/]\)"	      end="\z1" skip="\\\\\|\\\z1" contains=@rubyStringSpecial
-  syn region rubyString matchgroup=rubyStringDelimiter start="%[QWx]\z([~`!@#$%^&*_\-+=|\:;"',.?/]\)" end="\z1" skip="\\\\\|\\\z1" contains=@rubyStringSpecial
-  syn region rubyString matchgroup=rubyStringDelimiter start="%[QWx]\={"			      end="}"	skip="\\\\\|\\}"   contains=@rubyStringSpecial,rubyNestedCurlyBraces,rubyDelimiterEscape
-  syn region rubyString matchgroup=rubyStringDelimiter start="%[QWx]\=<"			      end=">"	skip="\\\\\|\\>"   contains=@rubyStringSpecial,rubyNestedAngleBrackets,rubyDelimiterEscape
-  syn region rubyString matchgroup=rubyStringDelimiter start="%[QWx]\=\["			      end="\]"	skip="\\\\\|\\\]"  contains=@rubyStringSpecial,rubyNestedSquareBrackets,rubyDelimiterEscape
-  syn region rubyString matchgroup=rubyStringDelimiter start="%[QWx]\=("			      end=")"	skip="\\\\\|\\)"   contains=@rubyStringSpecial,rubyNestedParentheses,rubyDelimiterEscape
-  syn region rubyString matchgroup=rubyStringDelimiter start="%[Qx]\z(\s\)"			      end="\z1" skip="\\\\\|\\\z1" contains=@rubyStringSpecial
-endif
+" Non-bracket punctuation delimiters {{{2
+let s:names = { '~': 'Tilde', '`': 'BackQuote', '!': 'Bang', '@': 'At', '#': 'Hash', '$': 'Dollar', '%': 'Percent', '^': 'Caret',
+      \		'&': 'Ampersand', '*': 'Asterix', '_': 'Underscore', '-': 'Dash', '+': 'Plus', '=': 'Equals', '|': 'Bar',
+      \		'\': 'Backslash', ':': 'Colon', ';': 'Semicolon', '"': 'DoubleQuote', "'": 'Quote', ',': 'Comma', '.': 'Period',
+      \		'?': 'QuestionMark', '/': 'ForwardSlash' }
 
-" Array of Symbols {{{1
-if s:foldable('%')
-  " Array of Symbols
-  syn region rubySymbol matchgroup=rubySymbolDelimiter start="%i\z([~`!@#$%^&*_\-+=|\:;"',.?/]\)" end="\z1" skip="\\\\\|\\\z1"	fold
-  syn region rubySymbol matchgroup=rubySymbolDelimiter start="%i{"				  end="}"   skip="\\\\\|\\}"	fold contains=rubyNestedCurlyBraces,rubyDelimiterEscape
-  syn region rubySymbol matchgroup=rubySymbolDelimiter start="%i<"				  end=">"   skip="\\\\\|\\>"	fold contains=rubyNestedAngleBrackets,rubyDelimiterEscape
-  syn region rubySymbol matchgroup=rubySymbolDelimiter start="%i\["				  end="\]"  skip="\\\\\|\\\]"	fold contains=rubyNestedSquareBrackets,rubyDelimiterEscape
-  syn region rubySymbol matchgroup=rubySymbolDelimiter start="%i("				  end=")"   skip="\\\\\|\\)"	fold contains=rubyNestedParentheses,rubyDelimiterEscape
-
-  " Array of interpolated Symbols
-  syn region rubySymbol matchgroup=rubySymbolDelimiter start="%I\z([~`!@#$%^&*_\-+=|\:;"',.?/]\)" end="\z1" skip="\\\\\|\\\z1"	contains=@rubyStringSpecial fold
-  syn region rubySymbol matchgroup=rubySymbolDelimiter start="%I{"				  end="}"   skip="\\\\\|\\}"	contains=@rubyStringSpecial,rubyNestedCurlyBraces,rubyDelimiterEscape    fold
-  syn region rubySymbol matchgroup=rubySymbolDelimiter start="%I<"				  end=">"   skip="\\\\\|\\>"	contains=@rubyStringSpecial,rubyNestedAngleBrackets,rubyDelimiterEscape  fold
-  syn region rubySymbol matchgroup=rubySymbolDelimiter start="%I\["				  end="\]"  skip="\\\\\|\\\]"	contains=@rubyStringSpecial,rubyNestedSquareBrackets,rubyDelimiterEscape fold
-  syn region rubySymbol matchgroup=rubySymbolDelimiter start="%I("				  end=")"   skip="\\\\\|\\)"	contains=@rubyStringSpecial,rubyNestedParentheses,rubyDelimiterEscape    fold
-else
-  " Array of Symbols
-  syn region rubySymbol matchgroup=rubySymbolDelimiter start="%i\z([~`!@#$%^&*_\-+=|\:;"',.?/]\)" end="\z1" skip="\\\\\|\\\z1"
-  syn region rubySymbol matchgroup=rubySymbolDelimiter start="%i{"				  end="}"   skip="\\\\\|\\}"	contains=rubyNestedCurlyBraces,rubyDelimiterEscape
-  syn region rubySymbol matchgroup=rubySymbolDelimiter start="%i<"				  end=">"   skip="\\\\\|\\>"	contains=rubyNestedAngleBrackets,rubyDelimiterEscape
-  syn region rubySymbol matchgroup=rubySymbolDelimiter start="%i\["				  end="\]"  skip="\\\\\|\\\]"	contains=rubyNestedSquareBrackets,rubyDelimiterEscape
-  syn region rubySymbol matchgroup=rubySymbolDelimiter start="%i("				  end=")"   skip="\\\\\|\\)"	contains=rubyNestedParentheses,rubyDelimiterEscape
-
-  " Array of interpolated Symbols
-  syn region rubySymbol matchgroup=rubySymbolDelimiter start="%I\z([~`!@#$%^&*_\-+=|\:;"',.?/]\)" end="\z1" skip="\\\\\|\\\z1"	contains=@rubyStringSpecial
-  syn region rubySymbol matchgroup=rubySymbolDelimiter start="%I{"				  end="}"   skip="\\\\\|\\}"	contains=@rubyStringSpecial,rubyNestedCurlyBraces,rubyDelimiterEscape
-  syn region rubySymbol matchgroup=rubySymbolDelimiter start="%I<"				  end=">"   skip="\\\\\|\\>"	contains=@rubyStringSpecial,rubyNestedAngleBrackets,rubyDelimiterEscape
-  syn region rubySymbol matchgroup=rubySymbolDelimiter start="%I\["				  end="\]"  skip="\\\\\|\\\]"	contains=@rubyStringSpecial,rubyNestedSquareBrackets,rubyDelimiterEscape
-  syn region rubySymbol matchgroup=rubySymbolDelimiter start="%I("				  end=")"   skip="\\\\\|\\)"	contains=@rubyStringSpecial,rubyNestedParentheses,rubyDelimiterEscape
-endif
+for s:delimiter in keys(s:names)
+  let s:group = 'ruby' . s:names[s:delimiter] . 'Escape'
 
-" Here Document {{{1
-syn region rubyHeredocStart matchgroup=rubyStringDelimiter start=+\%(\%(class\|::\)\_s*\|\%([]})"'.]\)\s\|\w\)\@<!<<[-~]\=\zs\%(\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*\)+	 end=+$+ oneline contains=ALLBUT,@rubyNotTop
-syn region rubyHeredocStart matchgroup=rubyStringDelimiter start=+\%(\%(class\|::\)\_s*\|\%([]})"'.]\)\s\|\w\)\@<!<<[-~]\=\zs"\%([^"]*\)"+ end=+$+ oneline contains=ALLBUT,@rubyNotTop
-syn region rubyHeredocStart matchgroup=rubyStringDelimiter start=+\%(\%(class\|::\)\_s*\|\%([]})"'.]\)\s\|\w\)\@<!<<[-~]\=\zs'\%([^']*\)'+ end=+$+ oneline contains=ALLBUT,@rubyNotTop
-syn region rubyHeredocStart matchgroup=rubyStringDelimiter start=+\%(\%(class\|::\)\_s*\|\%([]})"'.]\)\s\|\w\)\@<!<<[-~]\=\zs`\%([^`]*\)`+ end=+$+ oneline contains=ALLBUT,@rubyNotTop
-
-if s:foldable('<<')
-  syn region rubyString start=+\%(\%(class\|::\)\_s*\|\%([]})"'.]\)\s\|\w\)\@<!<<\z(\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*\)\ze\%(.*<<[-~]\=['`"]\=\h\)\@!+hs=s+2	matchgroup=rubyStringDelimiter end=+^\z1$+ contains=rubyHeredocStart,rubyHeredoc,@rubyStringSpecial fold keepend
-  syn region rubyString start=+\%(\%(class\|::\)\_s*\|\%([]})"'.]\)\s\|\w\)\@<!<<"\z([^"]*\)"\ze\%(.*<<[-~]\=['`"]\=\h\)\@!+hs=s+2	matchgroup=rubyStringDelimiter end=+^\z1$+ contains=rubyHeredocStart,rubyHeredoc,@rubyStringSpecial fold keepend
-  syn region rubyString start=+\%(\%(class\|::\)\_s*\|\%([]})"'.]\)\s\|\w\)\@<!<<'\z([^']*\)'\ze\%(.*<<[-~]\=['`"]\=\h\)\@!+hs=s+2	matchgroup=rubyStringDelimiter end=+^\z1$+ contains=rubyHeredocStart,rubyHeredoc		    fold keepend
-  syn region rubyString start=+\%(\%(class\|::\)\_s*\|\%([]})"'.]\)\s\|\w\)\@<!<<`\z([^`]*\)`\ze\%(.*<<[-~]\=['`"]\=\h\)\@!+hs=s+2	matchgroup=rubyStringDelimiter end=+^\z1$+ contains=rubyHeredocStart,rubyHeredoc,@rubyStringSpecial fold keepend
-
-  syn region rubyString start=+\%(\%(class\|::\)\_s*\|\%([]}).]\)\s\|\w\)\@<!<<[-~]\z(\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*\)\ze\%(.*<<[-~]\=['`"]\=\h\)\@!+hs=s+3    matchgroup=rubyStringDelimiter end=+^\s*\zs\z1$+ contains=rubyHeredocStart,@rubyStringSpecial fold keepend
-  syn region rubyString start=+\%(\%(class\|::\)\_s*\|\%([]}).]\)\s\|\w\)\@<!<<[-~]"\z([^"]*\)"\ze\%(.*<<[-~]\=['`"]\=\h\)\@!+hs=s+3  matchgroup=rubyStringDelimiter end=+^\s*\zs\z1$+ contains=rubyHeredocStart,@rubyStringSpecial fold keepend
-  syn region rubyString start=+\%(\%(class\|::\)\_s*\|\%([]}).]\)\s\|\w\)\@<!<<[-~]'\z([^']*\)'\ze\%(.*<<[-~]\=['`"]\=\h\)\@!+hs=s+3  matchgroup=rubyStringDelimiter end=+^\s*\zs\z1$+ contains=rubyHeredocStart		    fold keepend
-  syn region rubyString start=+\%(\%(class\|::\)\_s*\|\%([]}).]\)\s\|\w\)\@<!<<[-~]`\z([^`]*\)`\ze\%(.*<<[-~]\=['`"]\=\h\)\@!+hs=s+3  matchgroup=rubyStringDelimiter end=+^\s*\zs\z1$+ contains=rubyHeredocStart,@rubyStringSpecial fold keepend
-else
-  syn region rubyString start=+\%(\%(class\|::\)\_s*\|\%([]})"'.]\)\s\|\w\)\@<!<<\z(\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*\)\ze\%(.*<<[-~]\=['`"]\=\h\)\@!+hs=s+2	matchgroup=rubyStringDelimiter end=+^\z1$+ contains=rubyHeredocStart,rubyHeredoc,@rubyStringSpecial keepend
-  syn region rubyString start=+\%(\%(class\|::\)\_s*\|\%([]})"'.]\)\s\|\w\)\@<!<<"\z([^"]*\)"\ze\%(.*<<[-~]\=['`"]\=\h\)\@!+hs=s+2	matchgroup=rubyStringDelimiter end=+^\z1$+ contains=rubyHeredocStart,rubyHeredoc,@rubyStringSpecial keepend
-  syn region rubyString start=+\%(\%(class\|::\)\_s*\|\%([]})"'.]\)\s\|\w\)\@<!<<'\z([^']*\)'\ze\%(.*<<[-~]\=['`"]\=\h\)\@!+hs=s+2	matchgroup=rubyStringDelimiter end=+^\z1$+ contains=rubyHeredocStart,rubyHeredoc		    keepend
-  syn region rubyString start=+\%(\%(class\|::\)\_s*\|\%([]})"'.]\)\s\|\w\)\@<!<<`\z([^`]*\)`\ze\%(.*<<[-~]\=['`"]\=\h\)\@!+hs=s+2	matchgroup=rubyStringDelimiter end=+^\z1$+ contains=rubyHeredocStart,rubyHeredoc,@rubyStringSpecial keepend
-
-  syn region rubyString start=+\%(\%(class\|::\)\_s*\|\%([]}).]\)\s\|\w\)\@<!<<[-~]\z(\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*\)\ze\%(.*<<[-~]\=['`"]\=\h\)\@!+hs=s+3    matchgroup=rubyStringDelimiter end=+^\s*\zs\z1$+ contains=rubyHeredocStart,@rubyStringSpecial keepend
-  syn region rubyString start=+\%(\%(class\|::\)\_s*\|\%([]}).]\)\s\|\w\)\@<!<<[-~]"\z([^"]*\)"\ze\%(.*<<[-~]\=['`"]\=\h\)\@!+hs=s+3  matchgroup=rubyStringDelimiter end=+^\s*\zs\z1$+ contains=rubyHeredocStart,@rubyStringSpecial keepend
-  syn region rubyString start=+\%(\%(class\|::\)\_s*\|\%([]}).]\)\s\|\w\)\@<!<<[-~]'\z([^']*\)'\ze\%(.*<<[-~]\=['`"]\=\h\)\@!+hs=s+3  matchgroup=rubyStringDelimiter end=+^\s*\zs\z1$+ contains=rubyHeredocStart		    keepend
-  syn region rubyString start=+\%(\%(class\|::\)\_s*\|\%([]}).]\)\s\|\w\)\@<!<<[-~]`\z([^`]*\)`\ze\%(.*<<[-~]\=['`"]\=\h\)\@!+hs=s+3  matchgroup=rubyStringDelimiter end=+^\s*\zs\z1$+ contains=rubyHeredocStart,@rubyStringSpecial keepend
-endif
+  if s:delimiter =~ '[\"]'
+    let s:delimiter = '\' . s:delimiter
+  endif
 
-" eRuby Config {{{1
-if exists('main_syntax') && main_syntax == 'eruby'
-  let b:ruby_no_expensive = 1
-endif
+  exe 'syn match ' . s:group . ' "\V\\' . s:delimiter . '" contained display'
+  exe 'syn cluster rubySingleCharEscape add=' . s:group
+  exe 'SynFold ''%'' syn region rubyString matchgroup=rubyPercentStringDelimiter start="\V%q' . s:delimiter . '" end="\V' . s:delimiter . '" skip="\V\\\\\|\\' . s:delimiter . '" contains=rubyBackslashEscape,'		 . s:group . ' nextgroup=@rubyModifier skipwhite'
+  exe 'SynFold ''%'' syn region rubyString matchgroup=rubyPercentStringDelimiter start="\V%w' . s:delimiter . '" end="\V' . s:delimiter . '" skip="\V\\\\\|\\' . s:delimiter . '" contains=rubyBackslashEscape,rubySpaceEscape,' . s:group . ' nextgroup=@rubyModifier skipwhite'
+  exe 'SynFold ''%'' syn region rubySymbol matchgroup=rubyPercentSymbolDelimiter start="\V%s' . s:delimiter . '" end="\V' . s:delimiter . '" skip="\V\\\\\|\\' . s:delimiter . '" contains=rubyBackslashEscape,'		 . s:group . ' nextgroup=@rubyModifier skipwhite'
+  exe 'SynFold ''%'' syn region rubySymbol matchgroup=rubyPercentSymbolDelimiter start="\V%i' . s:delimiter . '" end="\V' . s:delimiter . '" skip="\V\\\\\|\\' . s:delimiter . '" contains=rubyBackslashEscape,rubySpaceEscape,' . s:group . ' nextgroup=@rubyModifier skipwhite'
+  exe 'hi def link ' . s:group . ' rubyStringEscape'
+endfor
+
+unlet s:delimiter s:group s:names
+" }}}2
+
+SynFold '%' syn region rubyString matchgroup=rubyPercentStringDelimiter start="%q{"	  end="}"   skip="\\\\\|\\}"   contains=rubyBackslashEscape,rubyCurlyBraceEscape,rubyNestedCurlyBraces
+SynFold '%' syn region rubyString matchgroup=rubyPercentStringDelimiter start="%q<"	  end=">"   skip="\\\\\|\\>"   contains=rubyBackslashEscape,rubyAngleBracketEscape,rubyNestedAngleBrackets
+SynFold '%' syn region rubyString matchgroup=rubyPercentStringDelimiter start="%q\["	  end="\]"  skip="\\\\\|\\\]"  contains=rubyBackslashEscape,rubySquareBracketEscape,rubyNestedSquareBrackets
+SynFold '%' syn region rubyString matchgroup=rubyPercentStringDelimiter start="%q("	  end=")"   skip="\\\\\|\\)"   contains=rubyBackslashEscape,rubyParenthesisEscape,rubyNestedParentheses
+SynFold '%' syn region rubyString matchgroup=rubyPercentStringDelimiter start="%q\z(\s\)" end="\z1" skip="\\\\\|\\\z1" contains=rubyBackslashEscape,rubySpaceEscape
+
+SynFold '%' syn region rubyString matchgroup=rubyPercentStringDelimiter start="%w{"	  end="}"   skip="\\\\\|\\}"   contains=rubyBackslashEscape,rubySpaceEscape,rubyCurlyBraceEscape,rubyNestedCurlyBraces
+SynFold '%' syn region rubyString matchgroup=rubyPercentStringDelimiter start="%w<"	  end=">"   skip="\\\\\|\\>"   contains=rubyBackslashEscape,rubySpaceEscape,rubyAngleBracketEscape,rubyNestedAngleBrackets
+SynFold '%' syn region rubyString matchgroup=rubyPercentStringDelimiter start="%w\["	  end="\]"  skip="\\\\\|\\\]"  contains=rubyBackslashEscape,rubySpaceEscape,rubySquareBracketEscape,rubyNestedSquareBrackets
+SynFold '%' syn region rubyString matchgroup=rubyPercentStringDelimiter start="%w("	  end=")"   skip="\\\\\|\\)"   contains=rubyBackslashEscape,rubySpaceEscape,rubyParenthesisEscape,rubyNestedParentheses
+
+SynFold '%' syn region rubySymbol matchgroup=rubyPercentSymbolDelimiter start="%s{"	  end="}"   skip="\\\\\|\\}"   contains=rubyBackslashEscape,rubyCurlyBraceEscape,rubyNestedCurlyBraces
+SynFold '%' syn region rubySymbol matchgroup=rubyPercentSymbolDelimiter start="%s<"	  end=">"   skip="\\\\\|\\>"   contains=rubyBackslashEscape,rubyAngleBracketEscape,rubyNestedAngleBrackets
+SynFold '%' syn region rubySymbol matchgroup=rubyPercentSymbolDelimiter start="%s\["	  end="\]"  skip="\\\\\|\\\]"  contains=rubyBackslashEscape,rubySquareBracketEscape,rubyNestedSquareBrackets
+SynFold '%' syn region rubySymbol matchgroup=rubyPercentSymbolDelimiter start="%s("	  end=")"   skip="\\\\\|\\)"   contains=rubyBackslashEscape,rubyParenthesisEscape,rubyNestedParentheses
+SynFold '%' syn region rubyString matchgroup=rubyPercentSymbolDelimiter start="%s\z(\s\)" end="\z1" skip="\\\\\|\\\z1" contains=rubyBackslashEscape,rubySpaceEscape
+
+SynFold '%' syn region rubySymbol matchgroup=rubyPercentSymbolDelimiter start="%i{"	  end="}"   skip="\\\\\|\\}"   contains=rubyBackslashEscape,rubySpaceEscape,rubyCurlyBraceEscape,rubyNestedCurlyBraces
+SynFold '%' syn region rubySymbol matchgroup=rubyPercentSymbolDelimiter start="%i<"	  end=">"   skip="\\\\\|\\>"   contains=rubyBackslashEscape,rubySpaceEscape,rubyAngleBracketEscape,rubyNestedAngleBrackets
+SynFold '%' syn region rubySymbol matchgroup=rubyPercentSymbolDelimiter start="%i\["	  end="\]"  skip="\\\\\|\\\]"  contains=rubyBackslashEscape,rubySpaceEscape,rubySquareBracketEscape,rubyNestedSquareBrackets
+SynFold '%' syn region rubySymbol matchgroup=rubyPercentSymbolDelimiter start="%i("	  end=")"   skip="\\\\\|\\)"   contains=rubyBackslashEscape,rubySpaceEscape,rubyParenthesisEscape,rubyNestedParentheses
+
+" Generalized Double Quoted Strings, Array of Strings, Array of Symbols and Shell Command Output {{{1
+SynFold '%' syn region rubyString matchgroup=rubyPercentStringDelimiter start="\%(\%(\w\|[^\x00-\x7F]\|]\)\s*\)\@<!%=" end="="	 skip="\\\\\|\\="   contains=@rubyStringSpecial nextgroup=@rubyModifier skipwhite
+SynFold '%' syn region rubyString matchgroup=rubyPercentStringDelimiter start="%\z([~`!@#$%^&*_\-+|\:;"',.?/]\)"       end="\z1" skip="\\\\\|\\\z1" contains=@rubyStringSpecial nextgroup=@rubyModifier skipwhite
+SynFold '%' syn region rubyString matchgroup=rubyPercentStringDelimiter start="%[QWx]\z([~`!@#$%^&*_\-+=|\:;"',.?/]\)" end="\z1" skip="\\\\\|\\\z1" contains=@rubyStringSpecial nextgroup=@rubyModifier skipwhite
+SynFold '%' syn region rubyString matchgroup=rubyPercentStringDelimiter start="%[QWx]\={"			       end="}"	 skip="\\\\\|\\}"   contains=@rubyStringSpecial,rubyNestedCurlyBraces
+SynFold '%' syn region rubyString matchgroup=rubyPercentStringDelimiter start="%[QWx]\=<"			       end=">"	 skip="\\\\\|\\>"   contains=@rubyStringSpecial,rubyNestedAngleBrackets
+SynFold '%' syn region rubyString matchgroup=rubyPercentStringDelimiter start="%[QWx]\=\["			       end="\]"  skip="\\\\\|\\\]"  contains=@rubyStringSpecial,rubyNestedSquareBrackets
+SynFold '%' syn region rubyString matchgroup=rubyPercentStringDelimiter start="%[QWx]\=("			       end=")"	 skip="\\\\\|\\)"   contains=@rubyStringSpecial,rubyNestedParentheses
+SynFold '%' syn region rubyString matchgroup=rubyPercentStringDelimiter start="%[Qx]\z(\s\)"			       end="\z1" skip="\\\\\|\\\z1" contains=@rubyStringSpecial
+
+SynFold '%' syn region rubySymbol matchgroup=rubyPercentSymbolDelimiter start="%I\z([~`!@#$%^&*_\-+=|\:;"',.?/]\)" end="\z1" skip="\\\\\|\\\z1" contains=@rubyStringSpecial nextgroup=@rubyModifier skipwhite
+SynFold '%' syn region rubySymbol matchgroup=rubyPercentSymbolDelimiter start="%I{"				   end="}"   skip="\\\\\|\\}"	contains=@rubyStringSpecial,rubyNestedCurlyBraces
+SynFold '%' syn region rubySymbol matchgroup=rubyPercentSymbolDelimiter start="%I<"				   end=">"   skip="\\\\\|\\>"	contains=@rubyStringSpecial,rubyNestedAngleBrackets
+SynFold '%' syn region rubySymbol matchgroup=rubyPercentSymbolDelimiter start="%I\["				   end="\]"  skip="\\\\\|\\\]"	contains=@rubyStringSpecial,rubyNestedSquareBrackets
+SynFold '%' syn region rubySymbol matchgroup=rubyPercentSymbolDelimiter start="%I("				   end=")"   skip="\\\\\|\\)"	contains=@rubyStringSpecial,rubyNestedParentheses
+
+" Here Documents {{{1
+syn region rubyHeredocStart matchgroup=rubyHeredocDelimiter start=+\%(\%(class\|::\|\.\@1<!\.\)\_s*\|\%([]})"'`]\)\s\|\w\)\@<!<<[-~]\=\zs\%(\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*\)+ end=+$+ oneline contains=ALLBUT,@rubyNotTop
+
+syn region rubyHeredocStart matchgroup=rubyHeredocDelimiter start=+\%(\%(class\|::\|\.\@1<!\.\)\_s*\|\%([]})"'`]\)\s\|\w\)\@<!<<[-~]\=\zs"\%([^"]*\)"+					   end=+$+ oneline contains=ALLBUT,@rubyNotTop
+syn region rubyHeredocStart matchgroup=rubyHeredocDelimiter start=+\%(\%(class\|::\|\.\@1<!\.\)\_s*\|\%([]})"'`]\)\s\|\w\)\@<!<<[-~]\=\zs'\%([^']*\)'+					   end=+$+ oneline contains=ALLBUT,@rubyNotTop
+syn region rubyHeredocStart matchgroup=rubyHeredocDelimiter start=+\%(\%(class\|::\|\.\@1<!\.\)\_s*\|\%([]})"'`]\)\s\|\w\)\@<!<<[-~]\=\zs`\%([^`]*\)`+					   end=+$+ oneline contains=ALLBUT,@rubyNotTop
+
+SynFold '<<' syn region rubyString start=+\%(\%(class\|::\|\.\@1<!\.\)\_s*\|\%([]})"'`]\)\s\|\w\)\@<!<<\z(\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*\)\ze\%(.*<<[-~]\=['`"]\=\h\)\@!+hs=s+2  matchgroup=rubyHeredocDelimiter end=+^\z1$+	contains=rubyHeredocStart,@rubyStringSpecial keepend
+SynFold '<<' syn region rubyString start=+\%(\%(class\|::\|\.\@1<!\.\)\_s*\|\%([]})"'`]\)\s\|\w\)\@<!<<"\z([^"]*\)"\ze\%(.*<<[-~]\=['`"]\=\h\)\@!+hs=s+2				      matchgroup=rubyHeredocDelimiter end=+^\z1$+	contains=rubyHeredocStart,@rubyStringSpecial keepend
+SynFold '<<' syn region rubyString start=+\%(\%(class\|::\|\.\@1<!\.\)\_s*\|\%([]})"'`]\)\s\|\w\)\@<!<<'\z([^']*\)'\ze\%(.*<<[-~]\=['`"]\=\h\)\@!+hs=s+2				      matchgroup=rubyHeredocDelimiter end=+^\z1$+	contains=rubyHeredocStart		     keepend
+SynFold '<<' syn region rubyString start=+\%(\%(class\|::\|\.\@1<!\.\)\_s*\|\%([]})"'`]\)\s\|\w\)\@<!<<`\z([^`]*\)`\ze\%(.*<<[-~]\=['`"]\=\h\)\@!+hs=s+2				      matchgroup=rubyHeredocDelimiter end=+^\z1$+	contains=rubyHeredocStart,@rubyStringSpecial keepend
+
+SynFold '<<' syn region rubyString start=+\%(\%(class\|::\|\.\@1<!\.\)\_s*\|\%([]})]\)\s\|\w\)\@<!<<[-~]\z(\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*\)\ze\%(.*<<[-~]\=['`"]\=\h\)\@!+hs=s+3 matchgroup=rubyHeredocDelimiter end=+^\s*\zs\z1$+ contains=rubyHeredocStart,@rubyStringSpecial keepend
+SynFold '<<' syn region rubyString start=+\%(\%(class\|::\|\.\@1<!\.\)\_s*\|\%([]})]\)\s\|\w\)\@<!<<[-~]"\z([^"]*\)"\ze\%(.*<<[-~]\=['`"]\=\h\)\@!+hs=s+3				      matchgroup=rubyHeredocDelimiter end=+^\s*\zs\z1$+ contains=rubyHeredocStart,@rubyStringSpecial keepend
+SynFold '<<' syn region rubyString start=+\%(\%(class\|::\|\.\@1<!\.\)\_s*\|\%([]})]\)\s\|\w\)\@<!<<[-~]'\z([^']*\)'\ze\%(.*<<[-~]\=['`"]\=\h\)\@!+hs=s+3				      matchgroup=rubyHeredocDelimiter end=+^\s*\zs\z1$+ contains=rubyHeredocStart		     keepend
+SynFold '<<' syn region rubyString start=+\%(\%(class\|::\|\.\@1<!\.\)\_s*\|\%([]})]\)\s\|\w\)\@<!<<[-~]`\z([^`]*\)`\ze\%(.*<<[-~]\=['`"]\=\h\)\@!+hs=s+3				      matchgroup=rubyHeredocDelimiter end=+^\s*\zs\z1$+ contains=rubyHeredocStart,@rubyStringSpecial keepend
 
 " Module, Class, Method and Alias Declarations {{{1
-syn match  rubyAliasDeclaration    "[^[:space:];#.()]\+" contained contains=rubySymbol,rubyGlobalVariable,rubyPredefinedVariable nextgroup=rubyAliasDeclaration2 skipwhite
-syn match  rubyAliasDeclaration2   "[^[:space:];#.()]\+" contained contains=rubySymbol,rubyGlobalVariable,rubyPredefinedVariable
-syn match  rubyMethodDeclaration   "[^[:space:];#(]\+"	 contained contains=rubyConstant,rubyBoolean,rubyPseudoVariable,rubyInstanceVariable,rubyClassVariable,rubyGlobalVariable
-syn match  rubyClassDeclaration    "[^[:space:];#<]\+"	 contained contains=rubyClassName,rubyOperator
-syn match  rubyModuleDeclaration   "[^[:space:];#<]\+"	 contained contains=rubyModuleName,rubyOperator
-syn match  rubyMethodName "\<[_[:alpha:]][_[:alnum:]]*[?!=]\=[[:alnum:]_.:?!=]\@!" contained containedin=rubyMethodDeclaration
-syn match  rubyMethodName "\%(\s\|^\)\@1<=[_[:alpha:]][_[:alnum:]]*[?!=]\=\%(\s\|$\)\@=" contained containedin=rubyAliasDeclaration,rubyAliasDeclaration2
-syn match  rubyMethodName "\%([[:space:].]\|^\)\@2<=\%(\[\]=\=\|\*\*\|[-+!~]@\=\|[*/%|&^~]\|<<\|>>\|[<>]=\=\|<=>\|===\|[=!]=\|[=!]\~\|!\|`\)\%([[:space:];#(]\|$\)\@=" contained containedin=rubyAliasDeclaration,rubyAliasDeclaration2,rubyMethodDeclaration
+syn match rubyAliasDeclaration	"[^[:space:];#.()]\+" contained contains=rubySymbol,@rubyGlobalVariable nextgroup=rubyAliasDeclaration2 skipwhite
+syn match rubyAliasDeclaration2 "[^[:space:];#.()]\+" contained contains=rubySymbol,@rubyGlobalVariable
+syn match rubyMethodDeclaration "[^[:space:];#(]\+"   contained contains=rubyConstant,rubyBoolean,rubyPseudoVariable,rubyInstanceVariable,rubyClassVariable,rubyGlobalVariable
+syn match rubyClassDeclaration	"[^[:space:];#<]\+"   contained contains=rubyClassName,rubyScopeOperator nextgroup=rubySuperClassOperator skipwhite skipnl
+syn match rubyModuleDeclaration "[^[:space:];#<]\+"   contained contains=rubyModuleName,rubyScopeOperator
+
+syn match rubyMethodName "\<\%([_[:alpha:]]\|[^\x00-\x7F]\)\%([_[:alnum:]]\|[^\x00-\x7F]\)*[?!=]\=\%([[:alnum:]_.:?!=]\|[^\x00-\x7F]\)\@!"			      contained containedin=rubyMethodDeclaration
+syn match rubyMethodName "\%(\s\|^\)\@1<=\%([_[:alpha:]]\|[^\x00-\x7F]\)\%([_[:alnum:]]\|[^\x00-\x7F]\)*[?!=]\=\%(\s\|$\)\@="					      contained containedin=rubyAliasDeclaration,rubyAliasDeclaration2
+syn match rubyMethodName "\%([[:space:].]\|^\)\@1<=\%(\[\]=\=\|\*\*\|[-+!~]@\=\|[*/%|&^~]\|<<\|>>\|[<>]=\=\|<=>\|===\|[=!]=\|[=!]\~\|!\|`\)\%([[:space:];#(]\|$\)\@=" contained containedin=rubyAliasDeclaration,rubyAliasDeclaration2,rubyMethodDeclaration
 
-syn cluster rubyDeclaration contains=rubyAliasDeclaration,rubyAliasDeclaration2,rubyMethodDeclaration,rubyModuleDeclaration,rubyClassDeclaration,rubyMethodName,rubyBlockParameter
+syn cluster rubyDeclaration contains=rubyAliasDeclaration,rubyAliasDeclaration2,rubyMethodDeclaration,rubyModuleDeclaration,rubyClassDeclaration,rubyMethodName
 
 " Keywords {{{1
-" Note: the following keywords have already been defined:
-" begin case class def do end for if module unless until while
-syn match   rubyControl	       "\<\%(and\|break\|in\|next\|not\|or\|redo\|rescue\|retry\|return\)\>[?!]\@!"
-syn match   rubyOperator       "\<defined?" display
-syn match   rubyKeyword	       "\<\%(super\|yield\)\>[?!]\@!"
-syn match   rubyBoolean	       "\<\%(true\|false\)\>[?!]\@!"
-syn match   rubyPseudoVariable "\<\%(nil\|self\|__ENCODING__\|__dir__\|__FILE__\|__LINE__\|__callee__\|__method__\)\>[?!]\@!" " TODO: reorganise
-syn match   rubyBeginEnd       "\<\%(BEGIN\|END\)\>[?!]\@!"
+" TODO: reorganise
+syn match rubyControl	     "\%#=1\<\%(break\|in\|next\|redo\|retry\|return\)\>"
+syn match rubyKeyword	     "\%#=1\<\%(super\|yield\)\>"
+syn match rubyBoolean	     "\%#=1\<\%(true\|false\)\>[?!]\@!"
+syn match rubyPseudoVariable "\%#=1\<\(self\|nil\)\>[?!]\@!"
+syn match rubyPseudoVariable "\%#=1\<__\%(ENCODING\|dir\|FILE\|LINE\|callee\|method\)__\>"
+syn match rubyBeginEnd	     "\%#=1\<\%(BEGIN\|END\)\>"
 
 " Expensive Mode {{{1
 " Match 'end' with the appropriate opening keyword for syntax based folding
 " and special highlighting of module/class/method definitions
 if !exists("b:ruby_no_expensive") && !exists("ruby_no_expensive")
-  syn match  rubyDefine "\<alias\>"  nextgroup=rubyAliasDeclaration  skipwhite skipnl
-  syn match  rubyDefine "\<def\>"    nextgroup=rubyMethodDeclaration skipwhite skipnl
-  syn match  rubyDefine "\<undef\>"  nextgroup=rubyMethodName	     skipwhite skipnl
-  syn match  rubyClass	"\<class\>"  nextgroup=rubyClassDeclaration  skipwhite skipnl
-  syn match  rubyModule "\<module\>" nextgroup=rubyModuleDeclaration skipwhite skipnl
-
-  if s:foldable('def')
-    syn region rubyMethodBlock start="\<def\>"	matchgroup=rubyDefine end="\%(\<def\_s\+\)\@<!\<end\>" contains=ALLBUT,@rubyNotTop fold
-  else
-    syn region rubyMethodBlock start="\<def\>"	matchgroup=rubyDefine end="\%(\<def\_s\+\)\@<!\<end\>" contains=ALLBUT,@rubyNotTop
-  endif
-
-  if s:foldable('class')
-    syn region rubyBlock start="\<class\>"	matchgroup=rubyClass end="\<end\>" contains=ALLBUT,@rubyNotTop fold
-  else
-    syn region rubyBlock start="\<class\>"	matchgroup=rubyClass end="\<end\>" contains=ALLBUT,@rubyNotTop
-  endif
+  syn match rubyDefine "\<alias\>"  nextgroup=rubyAliasDeclaration			  skipwhite skipnl
+  syn match rubyDefine "\<def\>"    nextgroup=rubyMethodDeclaration			  skipwhite skipnl
+  syn match rubyDefine "\<undef\>"  nextgroup=rubyMethodName				  skipwhite skipnl
+  syn match rubyClass  "\<class\>"  nextgroup=rubyClassDeclaration,rubyEigenClassOperator skipwhite skipnl
+  syn match rubyModule "\<module\>" nextgroup=rubyModuleDeclaration			  skipwhite skipnl
 
-  if s:foldable('module')
-    syn region rubyBlock start="\<module\>" matchgroup=rubyModule end="\<end\>" contains=ALLBUT,@rubyNotTop fold
-  else
-    syn region rubyBlock start="\<module\>" matchgroup=rubyModule end="\<end\>" contains=ALLBUT,@rubyNotTop
-  endif
+  SynFold 'def'    syn region rubyMethodBlock start="\<def\>"	 matchgroup=rubyDefine skip="\<end:\|\%(\<def\_s\+\)\@<=end\>" end="\<end\>" contains=ALLBUT,@rubyNotTop
+  SynFold 'class'  syn region rubyClassBlock  start="\<class\>"  matchgroup=rubyClass  skip="\<end:"			       end="\<end\>" contains=ALLBUT,@rubyNotTop
+  SynFold 'module' syn region rubyModuleBlock start="\<module\>" matchgroup=rubyModule skip="\<end:"			       end="\<end\>" contains=ALLBUT,@rubyNotTop
 
   " modifiers
-  syn match rubyLineContinuation    "\\$" nextgroup=rubyConditionalModifier,rubyRepeatModifier skipwhite skipnl
+  syn match rubyLineContinuation    "\\$" nextgroup=@rubyModifier skipwhite skipnl
   syn match rubyConditionalModifier "\<\%(if\|unless\)\>"
   syn match rubyRepeatModifier	    "\<\%(while\|until\)\>"
+  syn match rubyRescueModifier	    "\<rescue\>"
 
-  if s:foldable('do')
-    syn region rubyDoBlock matchgroup=rubyControl start="\<do\>" end="\<end\>" contains=ALLBUT,@rubyNotTop fold
-  else
-    syn region rubyDoBlock matchgroup=rubyControl start="\<do\>" end="\<end\>" contains=ALLBUT,@rubyNotTop
-  endif
+  syn cluster rubyModifier contains=rubyConditionalModifier,rubyRepeatModifier,rubyRescueModifier
 
-  " curly bracket block or hash literal
-  if s:foldable('{')
-    syn region rubyCurlyBlock matchgroup=rubyCurlyBlockDelimiter start="{" end="}" contains=ALLBUT,@rubyNotTop fold
-  else
-    syn region rubyCurlyBlock matchgroup=rubyCurlyBlockDelimiter start="{" end="}" contains=ALLBUT,@rubyNotTop
-  endif
+  SynFold 'do' syn region rubyDoBlock matchgroup=rubyControl start="\<do\>" skip="\<end:" end="\<end\>" contains=ALLBUT,@rubyNotTop
 
-  if s:foldable('[')
-    syn region rubyArrayLiteral	matchgroup=rubyArrayDelimiter start="\%(\w\|[\]})]\)\@<!\[" end="]" contains=ALLBUT,@rubyNotTop fold
-  endif
+  " curly bracket block or hash literal
+  SynFold '{' syn region rubyCurlyBlock   matchgroup=rubyCurlyBlockDelimiter start="{"						    end="}" contains=ALLBUT,@rubyNotTop
+  SynFold '[' syn region rubyArrayLiteral matchgroup=rubyArrayDelimiter      start="\%(\%(\w\|[^\x00-\x7F]\)[?!]\=\|[]})]\)\@2<!\[" end="]" contains=ALLBUT,@rubyNotTop
 
   " statements without 'do'
-  if s:foldable('begin')
-    syn region rubyBlockExpression matchgroup=rubyControl start="\<begin\>" end="\<end\>" contains=ALLBUT,@rubyNotTop fold
-  else
-    syn region rubyBlockExpression matchgroup=rubyControl start="\<begin\>" end="\<end\>" contains=ALLBUT,@rubyNotTop
-  endif
+  SynFold 'begin' syn region rubyBlockExpression matchgroup=rubyControl     start="\<begin\>" skip="\<end:" end="\<end\>" contains=ALLBUT,@rubyNotTop
+  SynFold 'case'  syn region rubyCaseExpression  matchgroup=rubyConditional start="\<case\>"  skip="\<end:" end="\<end\>" contains=ALLBUT,@rubyNotTop
 
-  if s:foldable('case')
-    syn region rubyCaseExpression matchgroup=rubyConditional start="\<case\>" end="\<end\>" contains=ALLBUT,@rubyNotTop fold
-  else
-    syn region rubyCaseExpression matchgroup=rubyConditional start="\<case\>" end="\<end\>" contains=ALLBUT,@rubyNotTop
-  endif
+  SynFold 'if' syn region rubyConditionalExpression matchgroup=rubyConditional start="\%(\%(^\|\.\.\.\=\|[{:,;([<>~\*/%&^|+=-]\|\<then\s\|\%(\<\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*\)\@<![?!]\)\s*\)\@<=\%(if\|unless\)\>" skip="\<end:" end="\<end\>" contains=ALLBUT,@rubyNotTop
 
-  if s:foldable('if')
-    syn region rubyConditionalExpression matchgroup=rubyConditional start="\%(\%(^\|\.\.\.\=\|[{:,;([<>~\*%&^|+=-]\|\%(\<[_[:lower:]][_[:alnum:]]*\)\@<![?!]\)\s*\)\@<=\%(if\|unless\)\>" end="\%(\%(\%(\.\@1<!\.\)\|::\)\s*\)\@<!\<end\>" contains=ALLBUT,@rubyNotTop fold
-  else
-    syn region rubyConditionalExpression matchgroup=rubyConditional start="\%(\%(^\|\.\.\.\=\|[{:,;([<>~\*%&^|+=-]\|\%(\<[_[:lower:]][_[:alnum:]]*\)\@<![?!]\)\s*\)\@<=\%(if\|unless\)\>" end="\%(\%(\%(\.\@1<!\.\)\|::\)\s*\)\@<!\<end\>" contains=ALLBUT,@rubyNotTop
-  endif
+  syn match rubyConditional "\<\%(then\|else\|when\)\>"	 contained containedin=rubyCaseExpression
+  syn match rubyConditional "\<\%(then\|else\|elsif\)\>" contained containedin=rubyConditionalExpression
 
-  syn match rubyConditional "\<\%(then\|else\|when\)\>[?!]\@!"	contained containedin=rubyCaseExpression
-  syn match rubyConditional "\<\%(then\|else\|elsif\)\>[?!]\@!" contained containedin=rubyConditionalExpression
-
-  syn match rubyExceptional	  "\<\%(\%(\%(;\|^\)\s*\)\@<=rescue\|else\|ensure\)\>[?!]\@!" contained containedin=rubyBlockExpression
-  syn match rubyMethodExceptional "\<\%(\%(\%(;\|^\)\s*\)\@<=rescue\|else\|ensure\)\>[?!]\@!" contained containedin=rubyMethodBlock
+  syn match   rubyExceptionHandler  "\<\%(\%(\%(;\|^\)\s*\)\@<=rescue\|else\|ensure\)\>" contained containedin=rubyBlockExpression,rubyDoBlock
+  syn match   rubyExceptionHandler2 "\<\%(\%(\%(;\|^\)\s*\)\@<=rescue\|else\|ensure\)\>" contained containedin=rubyModuleBlock,rubyClassBlock,rubyMethodBlock
+  syn cluster rubyExceptionHandler  contains=rubyExceptionHandler,rubyExceptionHandler2
 
   " statements with optional 'do'
-  syn region rubyOptionalDoLine   matchgroup=rubyRepeat start="\<for\>[?!]\@!" start="\%(\%(^\|\.\.\.\=\|[{:,;([<>~\*/%&^|+-]\|\%(\<[_[:lower:]][_[:alnum:]]*\)\@<![!=?]\)\s*\)\@<=\<\%(until\|while\)\>" matchgroup=rubyOptionalDo end="\%(\<do\>\)" end="\ze\%(;\|$\)" oneline contains=ALLBUT,@rubyNotTop
+  syn region rubyOptionalDoLine matchgroup=rubyRepeat start="\<for\>" start="\%(\%(^\|\.\.\.\=\|[{:,;([<>~\*/%&^|+=-]\|\%(\<\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*\)\@<![!?]\)\s*\)\@<=\<\%(until\|while\)\>" matchgroup=rubyOptionalDo end="\<do\>" end="\ze\%(;\|$\)" oneline contains=ALLBUT,@rubyNotTop
 
-  if s:foldable('for')
-    syn region rubyRepeatExpression start="\<for\>[?!]\@!" start="\%(\%(^\|\.\.\.\=\|[{:,;([<>~\*/%&^|+-]\|\%(\<[_[:lower:]][_[:alnum:]]*\)\@<![!=?]\)\s*\)\@<=\<\%(until\|while\)\>" matchgroup=rubyRepeat end="\<end\>" contains=ALLBUT,@rubyNotTop nextgroup=rubyOptionalDoLine fold
-  else
-    syn region rubyRepeatExpression start="\<for\>[?!]\@!" start="\%(\%(^\|\.\.\.\=\|[{:,;([<>~\*/%&^|+-]\|\%(\<[_[:lower:]][_[:alnum:]]*\)\@<![!=?]\)\s*\)\@<=\<\%(until\|while\)\>" matchgroup=rubyRepeat end="\<end\>" contains=ALLBUT,@rubyNotTop nextgroup=rubyOptionalDoLine
-  endif
+  SynFold 'for' syn region rubyRepeatExpression start="\<for\>" start="\%(\%(^\|\.\.\.\=\|[{:,;([<>~\*/%&^|+=-]\|\%(\<\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*\)\@<![!?]\)\s*\)\@<=\<\%(until\|while\)\>" matchgroup=rubyRepeat skip="\<end:" end="\<end\>" contains=ALLBUT,@rubyNotTop nextgroup=rubyOptionalDoLine
 
   if !exists("ruby_minlines")
     let ruby_minlines = 500
   endif
-  exec "syn sync minlines=" . ruby_minlines
+  exe "syn sync minlines=" . ruby_minlines
 
 else
-  syn match rubyControl "\<def\>[?!]\@!"    nextgroup=rubyMethodDeclaration skipwhite skipnl
-  syn match rubyControl "\<class\>[?!]\@!"  nextgroup=rubyClassDeclaration  skipwhite skipnl
-  syn match rubyControl "\<module\>[?!]\@!" nextgroup=rubyModuleDeclaration skipwhite skipnl
-  syn match rubyControl "\<\%(case\|begin\|do\|for\|if\|unless\|while\|until\|else\|elsif\|ensure\|then\|when\|end\)\>[?!]\@!"
-  syn match rubyKeyword "\<\%(alias\|undef\)\>[?!]\@!"
+  syn match rubyControl "\<def\>"    nextgroup=rubyMethodDeclaration skipwhite skipnl
+  syn match rubyControl "\<class\>"  nextgroup=rubyClassDeclaration  skipwhite skipnl
+  syn match rubyControl "\<module\>" nextgroup=rubyModuleDeclaration skipwhite skipnl
+  syn match rubyControl "\<\%(case\|begin\|do\|for\|if\|unless\|while\|until\|else\|elsif\|rescue\|ensure\|then\|when\|end\)\>"
+  syn match rubyKeyword "\<\%(alias\|undef\)\>"
 endif
 
 " Special Methods {{{1
 if !exists("ruby_no_special_methods")
-  syn keyword rubyAccess    public protected private public_class_method private_class_method public_constant private_constant module_function
-  " attr is a common variable name
-  syn match   rubyAttribute "\%(\%(^\|;\)\s*\)\@<=attr\>\(\s*[.=]\)\@!"
-  syn keyword rubyAttribute attr_accessor attr_reader attr_writer
-  syn match   rubyControl   "\<\%(exit!\|\%(abort\|at_exit\|exit\|fork\|loop\|trap\)\>[?!]\@!\)"
-  syn keyword rubyEval	    eval class_eval instance_eval module_eval
-  syn keyword rubyException raise fail catch throw
-  syn keyword rubyInclude   autoload gem load require require_relative
-  syn keyword rubyKeyword   callcc caller lambda proc
-  " false positive with 'include?'
-  syn match   rubyMacro     "\<include\>[?!]\@!"
-  syn keyword rubyMacro     extend prepend refine using
-  syn keyword rubyMacro     alias_method define_method define_singleton_method remove_method undef_method
+  syn match rubyAccess	  "\<\%(public\|protected\|private\)\>" " use re=2
+  syn match rubyAccess	  "\%#=1\<\%(public\|private\)_class_method\>"
+  syn match rubyAccess	  "\%#=1\<\%(public\|private\)_constant\>"
+  syn match rubyAccess	  "\%#=1\<module_function\>"
+  syn match rubyAttribute "\%#=1\%(\%(^\|;\)\s*\)\@<=attr\>\(\s*[.=]\)\@!" " attr is a common variable name
+  syn match rubyAttribute "\%#=1\<attr_\%(accessor\|reader\|writer\)\>"
+  syn match rubyControl   "\%#=1\<\%(abort\|at_exit\|exit\|fork\|loop\|trap\)\>"
+  syn match rubyEval	  "\%#=1\<eval\>"
+  syn match rubyEval	  "\%#=1\<\%(class\|instance\|module\)_eval\>"
+  syn match rubyException "\%#=1\<\%(raise\|fail\|catch\|throw\)\>"
+  syn match rubyInclude   "\%#=1\<\%(autoload\|gem\|load\|require\%(_relative\)\=\)\>"
+  syn match rubyKeyword   "\%#=1\<\%(callcc\|caller\|lambda\|proc\)\>"
+  syn match rubyMacro	  "\%#=1\<\%(extend\|include\|prepend\|refine\|using\)\>"
+  syn match rubyMacro	  "\%#=1\<\%(alias\|define\|define_singleton\|remove\|undef\)_method\>"
 endif
 
 " Comments and Documentation {{{1
-syn match   rubySharpBang "\%^#!.*" display
-syn keyword rubyTodo	  FIXME NOTE TODO OPTIMIZE HACK REVIEW XXX todo contained
-syn match   rubyComment   "#.*" contains=rubySharpBang,rubySpaceError,rubyTodo,@Spell
+syn match   rubySharpBang    "\%^#!.*" display
+syn keyword rubyTodo	     FIXME NOTE TODO OPTIMIZE HACK REVIEW XXX todo contained
+syn match   rubyEncoding     "[[:alnum:]-]\+" contained display
+syn match   rubyMagicComment "\c\%<3l#\s*\zs\%(coding\|encoding\):"					contained nextgroup=rubyEncoding skipwhite
+syn match   rubyMagicComment "\c\%<10l#\s*\zs\%(frozen_string_literal\|warn_indent\|warn_past_scope\):" contained nextgroup=rubyBoolean  skipwhite
+syn match   rubyComment	     "#.*" contains=@rubyCommentSpecial,rubySpaceError,@Spell
+
+syn cluster rubyCommentSpecial contains=rubySharpBang,rubyTodo,rubyMagicComment
+syn cluster rubyCommentNotTop  contains=@rubyCommentSpecial,rubyEncoding
+
 if !exists("ruby_no_comment_fold") && s:foldable('#')
   syn region rubyMultilineComment start="^\s*#.*\n\%(^\s*#\)\@=" end="^\s*#.*\n\%(^\s*#\)\@!" contains=rubyComment transparent fold keepend
-  syn region rubyDocumentation	  start="^=begin\ze\%(\s.*\)\=$" end="^=end\%(\s.*\)\=$" contains=rubySpaceError,rubyTodo,@Spell fold
+  syn region rubyDocumentation	  start="^=begin\ze\%(\s.*\)\=$" end="^=end\%(\s.*\)\=$"      contains=rubySpaceError,rubyTodo,@Spell fold
 else
-  syn region rubyDocumentation	  start="^=begin\s*$" end="^=end\s*$" contains=rubySpaceError,rubyTodo,@Spell
+  syn region rubyDocumentation	  start="^=begin\s*$"		 end="^=end\s*$"              contains=rubySpaceError,rubyTodo,@Spell
 endif
 
+" {{{1 Useless Line Continuations
+syn match rubyUselessLineContinuation "\%([.:,;{([<>~\*%&^|+=-]\|%(\%(\w\|[^\x00-\x7F]\)\@1<![?!]\)\s*\zs\\$" nextgroup=rubyUselessLineContinuation skipwhite skipempty
+syn match rubyUselessLineContinuation "\\$"								      nextgroup=rubyUselessLineContinuation skipwhite skipempty contained
+
 " Keyword Nobbling {{{1
-" Note: this is a hack to prevent 'keywords' being highlighted as such when called as methods with an explicit receiver
-syn match rubyKeywordAsMethod "\%(\%(\.\@1<!\.\)\|::\)\_s*\%([_[:lower:]][_[:alnum:]]*\|\<\%(BEGIN\|END\)\>\)" transparent contains=NONE
-syn match rubyKeywordAsMethod "\(defined?\|exit!\)\@!\<[_[:lower:]][_[:alnum:]]*[?!]"			       transparent contains=NONE
+" prevent methods with keyword names being highlighted as keywords when called
+syn match rubyKeywordAsMethod "\%(\%(\.\@1<!\.\)\|&\.\|::\)\_s*\%([_[:lower:]][_[:alnum:]]*\|\%(BEGIN\|END\)\>\)" transparent contains=rubyDotOperator,rubyScopeOperator
 
-" More Symbols {{{1
-syn match  rubySymbol		"\%([{(,]\_s*\)\zs\l\w*[!?]\=::\@!"he=e-1
-syn match  rubySymbol		"[]})\"':]\@1<!\<\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*[!?]\=:[[:space:],]\@="he=e-1
-syn match  rubySymbol		"\%([{(,]\_s*\)\zs[[:space:],{]\l\w*[!?]\=::\@!"hs=s+1,he=e-1
-syn match  rubySymbol		"[[:space:],{(]\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*[!?]\=:[[:space:],]\@="hs=s+1,he=e-1
+" Bang and Predicate Methods and Operators {{{1
+syn match rubyBangPredicateMethod "\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*[?!]"
 
-" __END__ Directive {{{1
-if s:foldable('__END__')
-  syn region rubyData matchgroup=rubyDataDirective start="^__END__$" end="\%$" fold
-else
-  syn region rubyData matchgroup=rubyDataDirective start="^__END__$" end="\%$"
+if !exists("ruby_no_special_methods")
+  syn match rubyControl "\%#=1\<exit!" display
 endif
+syn match rubyDefinedOperator "\%#=1\<defined?" display
+
+" 1.9-style Hash Keys and Keyword Parameters {{{1
+syn match rubySymbol "\%([{(|,]\_s*\)\@<=\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*[?!]\=::\@!"he=e-1
+syn match rubySymbol "[]})\"':]\@1<!\<\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*[!?]\=:[[:space:],;]\@="he=e-1
+syn match rubySymbol "[[:space:],{(]\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*[!?]\=:[[:space:],;]\@="hs=s+1,he=e-1
+
+" __END__ Directive {{{1
+SynFold '__END__' syn region rubyData matchgroup=rubyDataDirective start="^__END__$" end="\%$"
 
 " Default Highlighting {{{1
 hi def link rubyClass			rubyDefine
 hi def link rubyModule			rubyDefine
-hi def link rubyMethodExceptional	rubyDefine
+hi def link rubyExceptionHandler2	rubyDefine
 hi def link rubyDefine			Define
 hi def link rubyAccess			rubyMacro
 hi def link rubyAttribute		rubyMacro
@@ -488,14 +481,15 @@ hi def link rubyMethodName		rubyFunction
 hi def link rubyFunction		Function
 hi def link rubyConditional		Conditional
 hi def link rubyConditionalModifier	rubyConditional
-hi def link rubyExceptional		rubyConditional
+hi def link rubyExceptionHandler	rubyConditional
+hi def link rubyRescueModifier		rubyExceptionHandler
 hi def link rubyRepeat			Repeat
 hi def link rubyRepeatModifier		rubyRepeat
 hi def link rubyOptionalDo		rubyRepeat
 hi def link rubyControl			Statement
 hi def link rubyInclude			Include
 hi def link rubyInteger			Number
-hi def link rubyASCIICode		Character
+hi def link rubyCharacter		Character
 hi def link rubyFloat			Float
 hi def link rubyBoolean			Boolean
 hi def link rubyException		Exception
@@ -515,39 +509,80 @@ hi def link rubyPredefinedConstant	rubyPredefinedIdentifier
 hi def link rubyPredefinedVariable	rubyPredefinedIdentifier
 hi def link rubySymbol			Constant
 hi def link rubyKeyword			Keyword
+
 hi def link rubyOperator		Operator
+hi def link rubyDefinedOperator		rubyOperator
+hi def link rubyEnglishBooleanOperator	rubyOperator
+if exists("ruby_operators")
+  hi def link rubyTernaryOperator	rubyOperator
+  hi def link rubyArithmeticOperator	rubyOperator
+  hi def link rubyComparisonOperator	rubyOperator
+  hi def link rubyBitwiseOperator	rubyOperator
+  hi def link rubyBooleanOperator	rubyOperator
+  hi def link rubyRangeOperator		rubyOperator
+  hi def link rubyAssignmentOperator	rubyOperator
+  hi def link rubyEqualityOperator	rubyOperator
+endif
+
+if exists("ruby_pseudo_operators")
+  hi def link rubyPseudoOperator	Special
+  hi def link rubyDotOperator		rubyPseudoOperator
+  hi def link rubyScopeOperator		rubyPseudoOperator
+  hi def link rubySuperClassOperator	rubyPseudoOperator
+  hi def link rubyEigenClassOperator	rubyPseudoOperator
+  hi def link rubyLambdaOperator	rubyPseudoOperator
+  hi def link rubyDoubleSplatOperator	rubyPseudoOperator
+  hi def link rubySplatOperator		rubyPseudoOperator
+  hi def link rubyProcOperator		rubyPseudoOperator
+endif
+
 hi def link rubyBeginEnd		Statement
 hi def link rubyEval			Statement
 hi def link rubyPseudoVariable		Constant
-hi def link rubyCapitalizedMethod	rubyLocalVariableOrMethod
+hi def link rubyCapitalizedMethod	NONE
 
 hi def link rubyComment			Comment
+hi def link rubyEncoding		Constant
+hi def link rubyMagicComment		SpecialComment
 hi def link rubyData			Comment
 hi def link rubyDataDirective		Delimiter
 hi def link rubyDocumentation		Comment
 hi def link rubyTodo			Todo
 
+hi def link rubyBackslashEscape		rubyStringEscape
 hi def link rubyQuoteEscape		rubyStringEscape
+hi def link rubySpaceEscape		rubyStringEscape
+hi def link rubyParenthesisEscape	rubyStringEscape
+hi def link rubyCurlyBraceEscape	rubyStringEscape
+hi def link rubyAngleBracketEscape	rubyStringEscape
+hi def link rubySquareBracketEscape	rubyStringEscape
 hi def link rubyStringEscape		Special
+
 hi def link rubyInterpolationDelimiter	Delimiter
-hi def link rubyNoInterpolation		rubyString
 hi def link rubySharpBang		PreProc
+hi def link rubyStringDelimiter		Delimiter
+hi def link rubyHeredocDelimiter	rubyStringDelimiter
+hi def link rubyPercentRegexpDelimiter	rubyRegexpDelimiter
+hi def link rubyPercentStringDelimiter	rubyStringDelimiter
+hi def link rubyPercentSymbolDelimiter	rubySymbolDelimiter
 hi def link rubyRegexpDelimiter		rubyStringDelimiter
 hi def link rubySymbolDelimiter		rubySymbol
-hi def link rubyStringDelimiter		Delimiter
-hi def link rubyHeredoc			rubyString
 hi def link rubyString			String
 hi def link rubyRegexpEscape		rubyRegexpSpecial
 hi def link rubyRegexpQuantifier	rubyRegexpSpecial
 hi def link rubyRegexpAnchor		rubyRegexpSpecial
 hi def link rubyRegexpDot		rubyRegexpCharClass
 hi def link rubyRegexpCharClass		rubyRegexpSpecial
+hi def link rubyRegexpIntersection	rubyRegexpSpecial
 hi def link rubyRegexpSpecial		Special
 hi def link rubyRegexpComment		Comment
 hi def link rubyRegexp			rubyString
 
-hi def link rubyInvalidVariable		Error
 hi def link rubyError			Error
+if exists("ruby_line_continuation_error")
+  hi def link rubyUselessLineContinuation rubyError
+endif
+hi def link rubyGlobalVariableError	rubyError
 hi def link rubySpaceError		rubyError
 
 " Postscript {{{1
@@ -556,4 +591,6 @@ let b:current_syntax = "ruby"
 let &cpo = s:cpo_sav
 unlet! s:cpo_sav
 
+delc SynFold
+
 " vim: nowrap sw=2 sts=2 ts=8 noet fdm=marker: