" Vim syntax file
" Language:     Ruby
" Maintainer:   Mirko Nasato
" Last Change:  2000 Feb 19
" Location:     http://altern.org/mn/ruby/ruby.vim

" See http://altern.org/mn/ruby/vim.html for documentation.
" Thanks to perl.vim authors, and to Reimer Behrends. :-)

" Let's begin
syn clear

" Expression Substitution: and Backslash Notation
syn match   rubyExprSubst  "\\\\\|\(\(\\M-\\C-\|\\c\|\\C-\|\\M-\)\w\)\|\(\\\o\{3}\|\\x\x\{2}\|\\[tnrfbaes]\)" contained
syn match   rubyExprSubst  "#{[^}]*}" contained
syn match   rubyExprSubst  "#[$@]\w\+" contained

" Numbers: and ASCII Codes
syn match   rubyNumber  "\<\(0x\x\+\|0b[01]\+\|0\o\+\|0\.\d\+\|0\|[1-9][\.0-9_]*\)\>"
syn match   rubyNumber  "?\(\\M-\\C-\|\\c\|\\C-\|\\M-\)\=\(\\\o\{3}\|\\x\x\{2}\|\\\=\w\)"

" Special Identifiers: instance, global, symbol, iterator, predefined
if !exists("ruby_no_identifiers")
  syn match   rubyIdentifier  "\<\u\w*"
  syn match   rubyIdentifier  "@\h\w*"
  syn match   rubyIdentifier  "$\h\w*"  
  syn match   rubyIdentifier  "\s:\h\w*"
  syn match   rubyIdentifier  "|[ ,a-zA-Z0-9_*]\+|"
  syn match   rubyIdentifier  "$[\\\"/:'&`+*.,;=~!?@$<>0-9]"
  syn match   rubyIdentifier  "$-[0adFiIlpv]"
endif

"
" BEGIN Autogenerated Stuff (Ruby script @ http://altern.org/mn/ruby/vimregions.rb)
"
" Generalized Regular Expression:
syn region rubyString matchgroup=rubyStringDelimit start="%r!" end="![iopx]*" skip="\\\\\|\\!" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%r\"" end="\"[iopx]*" skip="\\\\\|\\\"" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%r#" end="#[iopx]*" skip="\\\\\|\\#" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%r\$" end="\$[iopx]*" skip="\\\\\|\\\$" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%r%" end="%[iopx]*" skip="\\\\\|\\%" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%r&" end="&[iopx]*" skip="\\\\\|\\&" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%r'" end="'[iopx]*" skip="\\\\\|\\'" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%r\*" end="\*[iopx]*" skip="\\\\\|\\\*" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%r+" end="+[iopx]*" skip="\\\\\|\\+" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%r-" end="-[iopx]*" skip="\\\\\|\\-" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%r\." end="\.[iopx]*" skip="\\\\\|\\\." contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%r/" end="/[iopx]*" skip="\\\\\|\\/" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%r:" end=":[iopx]*" skip="\\\\\|\\:" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%r;" end=";[iopx]*" skip="\\\\\|\\;" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%r=" end="=[iopx]*" skip="\\\\\|\\=" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%r?" end="?[iopx]*" skip="\\\\\|\\?" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%r@" end="@[iopx]*" skip="\\\\\|\\@" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%r\\" end="\\[iopx]*"  contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%r\^" end="\^[iopx]*" skip="\\\\\|\\\^" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%r`" end="`[iopx]*" skip="\\\\\|\\`" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%r|" end="|[iopx]*" skip="\\\\\|\\|" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%r\~" end="\~[iopx]*" skip="\\\\\|\\\~" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%r{" end="}[iopx]*" skip="\\\\\|\\}" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%r<" end=">[iopx]*" skip="\\\\\|\\>" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%r\[" end="\][iopx]*" skip="\\\\\|\\\]" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%r(" end=")[iopx]*" skip="\\\\\|\\)" contains=rubyExprSubst

" Generalized Single Quoted String and Array of Strings:
syn region rubyString matchgroup=rubyStringDelimit start="%[wq]!" end="!" skip="\\\\\|\\!" 
syn region rubyString matchgroup=rubyStringDelimit start="%[wq]\"" end="\"" skip="\\\\\|\\\"" 
syn region rubyString matchgroup=rubyStringDelimit start="%[wq]#" end="#" skip="\\\\\|\\#" 
syn region rubyString matchgroup=rubyStringDelimit start="%[wq]\$" end="\$" skip="\\\\\|\\\$" 
syn region rubyString matchgroup=rubyStringDelimit start="%[wq]%" end="%" skip="\\\\\|\\%" 
syn region rubyString matchgroup=rubyStringDelimit start="%[wq]&" end="&" skip="\\\\\|\\&" 
syn region rubyString matchgroup=rubyStringDelimit start="%[wq]'" end="'" skip="\\\\\|\\'" 
syn region rubyString matchgroup=rubyStringDelimit start="%[wq]\*" end="\*" skip="\\\\\|\\\*" 
syn region rubyString matchgroup=rubyStringDelimit start="%[wq]+" end="+" skip="\\\\\|\\+" 
syn region rubyString matchgroup=rubyStringDelimit start="%[wq]-" end="-" skip="\\\\\|\\-" 
syn region rubyString matchgroup=rubyStringDelimit start="%[wq]\." end="\." skip="\\\\\|\\\." 
syn region rubyString matchgroup=rubyStringDelimit start="%[wq]/" end="/" skip="\\\\\|\\/" 
syn region rubyString matchgroup=rubyStringDelimit start="%[wq]:" end=":" skip="\\\\\|\\:" 
syn region rubyString matchgroup=rubyStringDelimit start="%[wq];" end=";" skip="\\\\\|\\;" 
syn region rubyString matchgroup=rubyStringDelimit start="%[wq]=" end="=" skip="\\\\\|\\=" 
syn region rubyString matchgroup=rubyStringDelimit start="%[wq]?" end="?" skip="\\\\\|\\?" 
syn region rubyString matchgroup=rubyStringDelimit start="%[wq]@" end="@" skip="\\\\\|\\@" 
syn region rubyString matchgroup=rubyStringDelimit start="%[wq]\\" end="\\"  
syn region rubyString matchgroup=rubyStringDelimit start="%[wq]\^" end="\^" skip="\\\\\|\\\^" 
syn region rubyString matchgroup=rubyStringDelimit start="%[wq]`" end="`" skip="\\\\\|\\`" 
syn region rubyString matchgroup=rubyStringDelimit start="%[wq]|" end="|" skip="\\\\\|\\|" 
syn region rubyString matchgroup=rubyStringDelimit start="%[wq]\~" end="\~" skip="\\\\\|\\\~" 
syn region rubyString matchgroup=rubyStringDelimit start="%[wq]{" end="}" skip="\\\\\|\\}" 
syn region rubyString matchgroup=rubyStringDelimit start="%[wq]<" end=">" skip="\\\\\|\\>" 
syn region rubyString matchgroup=rubyStringDelimit start="%[wq]\[" end="\]" skip="\\\\\|\\\]" 
syn region rubyString matchgroup=rubyStringDelimit start="%[wq](" end=")" skip="\\\\\|\\)" 

" Generalized Double Quoted String and Shell Command Output:
syn region rubyString matchgroup=rubyStringDelimit start="%[Qx]\=!" end="!" skip="\\\\\|\\!" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%[Qx]\=\"" end="\"" skip="\\\\\|\\\"" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%[Qx]\=#" end="#" skip="\\\\\|\\#" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%[Qx]\=\$" end="\$" skip="\\\\\|\\\$" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%[Qx]\=%" end="%" skip="\\\\\|\\%" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%[Qx]\=&" end="&" skip="\\\\\|\\&" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%[Qx]\='" end="'" skip="\\\\\|\\'" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%[Qx]\=\*" end="\*" skip="\\\\\|\\\*" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%[Qx]\=+" end="+" skip="\\\\\|\\+" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%[Qx]\=-" end="-" skip="\\\\\|\\-" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%[Qx]\=\." end="\." skip="\\\\\|\\\." contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%[Qx]\=/" end="/" skip="\\\\\|\\/" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%[Qx]\=:" end=":" skip="\\\\\|\\:" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%[Qx]\=;" end=";" skip="\\\\\|\\;" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%[Qx]\==" end="=" skip="\\\\\|\\=" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%[Qx]\=?" end="?" skip="\\\\\|\\?" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%[Qx]\=@" end="@" skip="\\\\\|\\@" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%[Qx]\=\\" end="\\"  contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%[Qx]\=\^" end="\^" skip="\\\\\|\\\^" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%[Qx]\=`" end="`" skip="\\\\\|\\`" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%[Qx]\=|" end="|" skip="\\\\\|\\|" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%[Qx]\=\~" end="\~" skip="\\\\\|\\\~" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%[Qx]\={" end="}" skip="\\\\\|\\}" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%[Qx]\=<" end=">" skip="\\\\\|\\>" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%[Qx]\=\[" end="\]" skip="\\\\\|\\\]" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="%[Qx]\=(" end=")" skip="\\\\\|\\)" contains=rubyExprSubst

" Normal String and Shell Command Output:
syn region rubyString matchgroup=rubyStringDelimit start="\"" end="\"" skip="\\\\\|\\\"" contains=rubyExprSubst
syn region rubyString matchgroup=rubyStringDelimit start="'" end="'" skip="\\\\\|\\'" 
syn region rubyString matchgroup=rubyStringDelimit start="`" end="`" skip="\\\\\|\\`" contains=rubyExprSubst
"
" END Autogenerated Stuff
"

" Normal Regular Expression:
syn region  rubyString  matchgroup=rubyStringDelimit start="\<if\s*/"lc=2 start="[\~=!|&(,]\s*/"lc=1 end="/[iopx]*" skip="\\\\\|\\/" contains=rubyExprSubst

" Here Document:
syn region  rubyString matchgroup=rubyStringDelimit start=+<<-\(\u\{3,}\|'\u\{3,}'\|"\u\{3,}"\|`\u\{3,}`\)+hs=s+2 end=+^\s*\u\{3,}$+
syn region  rubyString matchgroup=rubyStringDelimit start=+<<-\(EOF\|'EOF'\|"EOF"\|`EOF`\)+hs=s+2 end=+^\s*EOF$+ contains=rubyExprSubst
syn region  rubyString matchgroup=rubyStringDelimit start=+<<-\(EOS\|'EOS'\|"EOS"\|`EOS`\)+hs=s+2 end=+^\s*EOS$+ contains=rubyExprSubst
syn region  rubyString matchgroup=rubyStringDelimit start=+<<\(\u\{3,}\|'\u\{3,}'\|"\u\{3,}"\|`\u\{3,}`\)+hs=s+2 end=+^\u\{3,}$+
syn region  rubyString matchgroup=rubyStringDelimit start=+<<\(EOF\|'EOF'\|"EOF"\|`EOF`\)+hs=s+2 end=+^EOF$+ contains=rubyExprSubst
syn region  rubyString matchgroup=rubyStringDelimit start=+<<\(EOS\|'EOS'\|"EOS"\|`EOS`\)+hs=s+2 end=+^EOS$+ contains=rubyExprSubst

" Expensive Mode: colorize *end* according to opening statement
if !exists("ruby_no_expensive")
  syn region  rubyFunction  matchgroup=rubyDefine start="^\s*def\s" matchgroup=NONE end="[?!]\|\>" skip="\.\|\(::\)" oneline
  syn region  rubyClassOrModule  matchgroup=rubyDefine start="^\s*\(class\|module\)\s" end="<\|$\|;"he=e-1 oneline
  syn region  rubyBlock  start="^\s*def\s\+"rs=s matchgroup=rubyDefine end="\<end\>" contains=ALLBUT,rubyExprSubst,rubyTodo nextgroup=rubyFunction
  syn region  rubyBlock  start="^\s*\(class\|module\)\>"rs=s matchgroup=rubyDefine end="\<end\>" contains=ALLBUT,rubyExprSubst,rubyTodo nextgroup=rubyClassOrModule
  " modifiers + redundant *do*
  syn match   rubyControl  "\<\(if\|unless\|while\|until\|do\)\>"
  " *do* requiring *end*
  syn region  rubyDoBlock  matchgroup=rubyControl start="\<do\>" end="\<end\>" contains=ALLBUT,rubyExprSubst,rubyTodo
  " statements without *do*
  syn region  rubyNoDoBlock  matchgroup=rubyControl start="\<\(case\|begin\)\>" start="^\s*\(if\|unless\)\>" start=";\s*\(if\|unless\)\>"hs=s+1 end="\<end\>" contains=ALLBUT,rubyExprSubst,rubyTodo
  " statement with optional *do*
  syn region  rubyOptDoBlock matchgroup=rubyControl start="\<for\>" start="^\s*\(while\|until\)\>" start=";\s*\(while\|until\)\>"hs=s+1 end="\<end\>" contains=ALLBUT,rubyExprSubst,rubyTodo,rubyDoBlock
  
  if !exists("ruby_minlines")
    let ruby_minlines = 50
  endif
  exec "syn sync minlines=" . ruby_minlines

else " not Expensive
  syn region  rubyFunction  matchgroup=rubyControl start="^\s*def\s" matchgroup=NONE end="[?!]\|\>" skip="\.\|\(::\)" oneline
  syn region  rubyClassOrModule  matchgroup=rubyControl start="^\s*\(class\|module\)\s" end="<\|$\|;"he=e-1 oneline
  syn keyword rubyControl case begin do for if unless while until end
endif " Expensive?

" Keywords:
syn keyword rubyControl  then else elsif when ensure rescue
syn keyword rubyControl  and or not in yield lambda proc loop
syn keyword rubyControl  break redo retry next return
syn match   rubyInclude  "^\s*include\>"
syn keyword rubyInclude  require
syn keyword rubyTodo  TODO FIXME XXX contained
syn keyword rubyBoolean  true false self nil
syn keyword rubyException  raise fail catch throw

" Comments: and Documentation
syn match   rubyComment  "#.*" contains=rubyTodo
syn match   rubySharpBang  "#!.*"
syn region  rubyDocumentation  start="^=begin" end="^=end.*$" contains=rubyTodo

" Do it
if !exists("did_ruby_syntax_inits")
  let did_ruby_syntax_inits = 1

  hi link rubyDefine          Define
  hi link rubyFunction        Function
  hi link rubyControl         Statement
  hi link rubyInclude         Include
  hi link rubyNumber          Number
  hi link rubyBoolean         Boolean
  hi link rubyException       Exception
  hi link rubyClassOrModule   Type
  hi link rubyIdentifier      Special
  hi link rubySharpBang       PreProc
  
  hi link rubyString          String
  hi link rubyStringDelimit   Delimiter
  hi link rubyExprSubst       Special
  
  hi link rubyComment         Comment
  hi link rubyDocumentation   Comment
  hi link rubyTodo            Todo
endif

let b:current_syntax = "ruby"