runtime/syntax/ruby.vim

" Vim syntax file
" Language:		Ruby
" Maintainer:		Doug Kearns <dougkearns@gmail.com>
" Info:			$Id$
" URL:			http://vim-ruby.rubyforge.org
" Anon CVS:		See above site
" Release Coordinator:	Doug Kearns <dougkearns@gmail.com>
" ----------------------------------------------------------------------------
"
" Previous Maintainer:	Mirko Nasato
" Thanks to perl.vim authors, and to Reimer Behrends. :-) (MN)
" ----------------------------------------------------------------------------

if exists("b:current_syntax")
  finish
endif

if has("folding") && exists("ruby_fold")
  setlocal foldmethod=syntax
endif

if exists("ruby_space_errors")
  if !exists("ruby_no_trail_space_error")
    syn match rubySpaceError display excludenl "\s\+$"
  endif
  if !exists("ruby_no_tab_space_error")
    syn match rubySpaceError display " \+\t"me=e-1
  endif
endif

" Operators
if exists("ruby_operators")
  syn match  rubyOperator	 "\%([~!^&|*/%+-]\|\%(class\s*\)\@<!<<\|<=>\|<=\|\%(<\|\<class\s\+\u\w*\s*\)\@<!<[^<]\@=\|===\|==\|=\~\|>>\|>=\|=\@<!>\|\*\*\|\.\.\.\|\.\.\|::\)"
  syn match  rubyPseudoOperator  "\%(-=\|/=\|\*\*=\|\*=\|&&=\|&=\|&&\|||=\||=\|||\|%=\|+=\|!\~\|!=\)"
  syn region rubyBracketOperator matchgroup=rubyOperator start="\%([_[:lower:]]\w*[?!=]\=\|[})]\)\@<=\[\s*" end="\s*]" contains=TOP
endif

" Expression Substitution and Backslash Notation
syn match rubyEscape	"\\\\\|\\[abefnrstv]\|\\\o\{1,3}\|\\x\x\{1,2}"							 contained display
syn match rubyEscape	"\%(\\M-\\C-\|\\C-\\M-\|\\M-\\c\|\\c\\M-\|\\c\|\\C-\|\\M-\)\%(\\\o\{1,3}\|\\x\x\{1,2}\|\\\=\S\)" contained display

syn region rubyInterpolation	      matchgroup=rubyInterpolationDelimiter start="#{" end="}" contained contains=TOP
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 rubyDelimEscape	"\\[(<{\[)>}\]]" transparent display contained contains=NONE

syn region rubyNestedParentheses	start="("	end=")"		skip="\\\\\|\\)"	transparent contained contains=@rubyStringSpecial,rubyNestedParentheses,rubyDelimEscape
syn region rubyNestedCurlyBraces	start="{"	end="}"		skip="\\\\\|\\}"	transparent contained contains=@rubyStringSpecial,rubyNestedCurlyBraces,rubyDelimEscape
syn region rubyNestedAngleBrackets	start="<"	end=">"		skip="\\\\\|\\>"	transparent contained contains=@rubyStringSpecial,rubyNestedAngleBrackets,rubyDelimEscape
if exists("ruby_operators")
  syn region rubyNestedSquareBrackets	start="\["	end="\]"	skip="\\\\\|\\\]"	transparent contained contains=@rubyStringSpecial,rubyNestedSquareBrackets,rubyDelimEscape
else
  syn region rubyNestedSquareBrackets	start="\["	end="\]"	skip="\\\\\|\\\]"	transparent containedin=rubyArrayLiteral contained contains=@rubyStringSpecial,rubyNestedSquareBrackets,rubyDelimEscape
endif

syn cluster rubyStringSpecial		contains=rubyInterpolation,rubyNoInterpolation,rubyEscape
syn cluster rubyExtendedStringSpecial	contains=@rubyStringSpecial,rubyNestedParentheses,rubyNestedCurlyBraces,rubyNestedAngleBrackets,rubyNestedSquareBrackets

" Numbers and ASCII Codes
syn match rubyASCIICode	"\%(\w\|[]})\"'/]\)\@<!\%(?\%(\\M-\\C-\|\\C-\\M-\|\\M-\\c\|\\c\\M-\|\\c\|\\C-\|\\M-\)\=\%(\\\o\{1,3}\|\\x\x\{1,2}\|\\\=\S\)\)"
syn match rubyInteger	"\<0[xX]\x\+\%(_\x\+\)*\>"								display
syn match rubyInteger	"\<\%(0[dD]\)\=\%(0\|[1-9]\d*\%(_\d\+\)*\)\>"						display
syn match rubyInteger	"\<0[oO]\=\o\+\%(_\o\+\)*\>"								display
syn match rubyInteger	"\<0[bB][01]\+\%(_[01]\+\)*\>"								display
syn match rubyFloat	"\<\%(0\|[1-9]\d*\%(_\d\+\)*\)\.\d\+\%(_\d\+\)*\>"					display
syn match rubyFloat	"\<\%(0\|[1-9]\d*\%(_\d\+\)*\)\%(\.\d\+\%(_\d\+\)*\)\=\%([eE][-+]\=\d\+\%(_\d\+\)*\)\>"	display

" Identifiers
syn match rubyLocalVariableOrMethod "\<[_[:lower:]][_[:alnum:]]*[?!=]\=" contains=NONE display transparent
syn match rubyBlockArgument	    "&[_[:lower:]][_[:alnum:]]"		 contains=NONE display transparent

syn match  rubyConstant			"\%(\%([.@$]\@<!\.\)\@<!\<\|::\)\_s*\zs\u\w*\%(\>\|::\)\@=\%(\s*(\)\@!"
syn match  rubyClassVariable		"@@\h\w*" display
syn match  rubyInstanceVariable		"@\h\w*"  display
syn match  rubyGlobalVariable		"$\%(\h\w*\|-.\)"
syn match  rubySymbol			"[]})\"':]\@<!:\%(\^\|\~\|<<\|<=>\|<=\|<\|===\|==\|=\~\|>>\|>=\|>\||\|-@\|-\|/\|\[]=\|\[]\|\*\*\|\*\|&\|%\|+@\|+\|`\)"
syn match  rubySymbol			"[]})\"':]\@<!:\$\%(-.\|[`~<=>_,;:!?/.'"@$*\&+0]\)"
syn match  rubySymbol			"[]})\"':]\@<!:\%(\$\|@@\=\)\=\h\w*"
syn match  rubySymbol			"[]})\"':]\@<!:\h\w*[?!=]\="
syn region rubySymbol			start="[]})\"':]\@<!:\"" end="\"" skip="\\\\\|\\\""
syn region rubySymbol			start="[]})\"':]\@<!:\"" end="\"" skip="\\\\\|\\\"" contains=@rubyStringSpecial fold

syn match  rubyBlockParameter		"\h\w*" contained
syn region rubyBlockParameterList	start="\%(\%(\<do\>\|{\)\s*\)\@<=|" end="|" oneline display contains=rubyBlockParameter

syn match rubyInvalidVariable    "$[^ A-Za-z-]"
syn match rubyPredefinedVariable #$[!$&"'*+,./0:;<=>?@\`~1-9]#
syn match rubyPredefinedVariable "$_\>"											   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*\zs\%(MatchingData\|ARGF\|ARGV\|ENV\)\>\%(\s*(\)\@!"
syn match rubyPredefinedConstant "\%(\%(\.\@<!\.\)\@<!\|::\)\_s*\zs\%(DATA\|FALSE\|NIL\|RUBY_PLATFORM\|RUBY_RELEASE_DATE\)\>\%(\s*(\)\@!"
syn match rubyPredefinedConstant "\%(\%(\.\@<!\.\)\@<!\|::\)\_s*\zs\%(RUBY_VERSION\|STDERR\|STDIN\|STDOUT\|TOPLEVEL_BINDING\|TRUE\)\>\%(\s*(\)\@!"
"Obsolete Global Constants
"syn match rubyPredefinedConstant "\%(::\)\=\zs\%(PLATFORM\|RELEASE_DATE\|VERSION\)\>"
"syn match rubyPredefinedConstant "\%(::\)\=\zs\%(NotImplementError\)\>"

" Normal Regular Expression
syn region rubyRegexp matchgroup=rubyRegexpDelimiter start="\%(\%(^\|\<\%(and\|or\|while\|until\|unless\|if\|elsif\|when\|not\|then\|else\)\|[;\~=!|&(,[>]\)\s*\)\@<=/" end="/[iomxneus]*" skip="\\\\\|\\/" contains=@rubyStringSpecial fold
syn region rubyRegexp matchgroup=rubyRegexpDelimiter start="\%(\<\%(split\|scan\|gsub\|sub\)\s*\)\@<=/" end="/[iomxneus]*" skip="\\\\\|\\/" contains=@rubyStringSpecial fold

" Normal String and Shell Command Output
syn region rubyString matchgroup=rubyStringDelimiter start="\"" end="\"" skip="\\\\\|\\\"" contains=@rubyStringSpecial fold
syn region rubyString matchgroup=rubyStringDelimiter start="'"	end="'"  skip="\\\\\|\\'"			       fold
syn region rubyString matchgroup=rubyStringDelimiter start="`"	end="`"  skip="\\\\\|\\`"  contains=@rubyStringSpecial fold

" Generalized Regular Expression
syn region rubyRegexp matchgroup=rubyRegexpDelimiter start="%r\z([~`!@#$%^&*_\-+=|\:;"',.?/]\)"	end="\z1[iomxneus]*" skip="\\\\\|\\\z1" contains=@rubyStringSpecial fold
syn region rubyRegexp matchgroup=rubyRegexpDelimiter start="%r{"				end="}[iomxneus]*"	 skip="\\\\\|\\}"   contains=@rubyStringSpecial,rubyNestedCurlyBraces,rubyDelimEscape fold
syn region rubyRegexp matchgroup=rubyRegexpDelimiter start="%r<"				end=">[iomxneus]*"	 skip="\\\\\|\\>"   contains=@rubyStringSpecial,rubyNestedAngleBrackets,rubyDelimEscape fold
syn region rubyRegexp matchgroup=rubyRegexpDelimiter start="%r\["				end="\][iomxneus]*"	 skip="\\\\\|\\\]"  contains=@rubyStringSpecial,rubyNestedSquareBrackets,rubyDelimEscape fold
syn region rubyRegexp matchgroup=rubyRegexpDelimiter start="%r("				end=")[iomxneus]*"	 skip="\\\\\|\\)"   contains=@rubyStringSpecial,rubyNestedParentheses,rubyDelimEscape fold

" Generalized Single Quoted String, Symbol and Array of Strings
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,rubyDelimEscape
syn region rubyString matchgroup=rubyStringDelimiter start="%[qw]<"				    end=">"   skip="\\\\\|\\>"	 fold	contains=rubyNestedAngleBrackets,rubyDelimEscape
syn region rubyString matchgroup=rubyStringDelimiter start="%[qw]\["				    end="\]"  skip="\\\\\|\\\]"	 fold	contains=rubyNestedSquareBrackets,rubyDelimEscape
syn region rubyString matchgroup=rubyStringDelimiter start="%[qw]("				    end=")"   skip="\\\\\|\\)"	 fold	contains=rubyNestedParentheses,rubyDelimEscape
syn region rubySymbol				     start="%[s]\z([~`!@#$%^&*_\-+=|\:;"',.?/]\)"   end="\z1" skip="\\\\\|\\\z1" fold
syn region rubySymbol				     start="%[s]{"				    end="}"   skip="\\\\\|\\}"	 fold	contains=rubyNestedCurlyBraces,rubyDelimEscape
syn region rubySymbol				     start="%[s]<"				    end=">"   skip="\\\\\|\\>"	 fold	contains=rubyNestedAngleBrackets,rubyDelimEscape
syn region rubySymbol				     start="%[s]\["				    end="\]"  skip="\\\\\|\\\]"	 fold	contains=rubyNestedSquareBrackets,rubyDelimEscape
syn region rubySymbol				     start="%[s]("				    end=")"   skip="\\\\\|\\)"	 fold	contains=rubyNestedParentheses,rubyDelimEscape

" Generalized Double Quoted String and Array of Strings and Shell Command Output
" Note: %= is not matched here as the beginning of a double quoted string
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,rubyDelimEscape fold
syn region rubyString matchgroup=rubyStringDelimiter start="%[QWx]\=<"				    end=">"   skip="\\\\\|\\>"	 contains=@rubyStringSpecial,rubyNestedAngleBrackets,rubyDelimEscape fold
syn region rubyString matchgroup=rubyStringDelimiter start="%[QWx]\=\["				    end="\]"  skip="\\\\\|\\\]"	 contains=@rubyStringSpecial,rubyNestedSquareBrackets,rubyDelimEscape fold
syn region rubyString matchgroup=rubyStringDelimiter start="%[QWx]\=("				    end=")"   skip="\\\\\|\\)"	 contains=@rubyStringSpecial,rubyNestedParentheses,rubyDelimEscape fold

" Here Document
syn region rubyHeredocStart matchgroup=rubyStringDelimiter start=+\%(\%(class\s*\|\%([]})"'.]\|::\)\)\_s*\|\w\)\@<!<<-\=\zs\%(\h\w*\)+   end=+$+ oneline contains=TOP
syn region rubyHeredocStart matchgroup=rubyStringDelimiter start=+\%(\%(class\s*\|\%([]})"'.]\|::\)\)\_s*\|\w\)\@<!<<-\=\zs"\%([^"]*\)"+ end=+$+ oneline contains=TOP
syn region rubyHeredocStart matchgroup=rubyStringDelimiter start=+\%(\%(class\s*\|\%([]})"'.]\|::\)\)\_s*\|\w\)\@<!<<-\=\zs'\%([^']*\)'+ end=+$+ oneline contains=TOP
syn region rubyHeredocStart matchgroup=rubyStringDelimiter start=+\%(\%(class\s*\|\%([]})"'.]\|::\)\)\_s*\|\w\)\@<!<<-\=\zs`\%([^`]*\)`+ end=+$+ oneline contains=TOP

syn region rubyString start=+\%(\%(class\s*\|\%([]})"'.]\|::\)\)\_s*\|\w\)\@<!<<\z(\h\w*\)\ze+hs=s+2    matchgroup=rubyStringDelimiter end=+^\z1$+ contains=rubyHeredocStart,@rubyStringSpecial fold keepend
syn region rubyString start=+\%(\%(class\s*\|\%([]})"'.]\|::\)\)\_s*\|\w\)\@<!<<"\z([^"]*\)"\ze+hs=s+2  matchgroup=rubyStringDelimiter end=+^\z1$+ contains=rubyHeredocStart,@rubyStringSpecial fold keepend
syn region rubyString start=+\%(\%(class\s*\|\%([]})"'.]\|::\)\)\_s*\|\w\)\@<!<<'\z([^']*\)'\ze+hs=s+2  matchgroup=rubyStringDelimiter end=+^\z1$+ contains=rubyHeredocStart		      fold keepend
syn region rubyString start=+\%(\%(class\s*\|\%([]})"'.]\|::\)\)\_s*\|\w\)\@<!<<`\z([^`]*\)`\ze+hs=s+2  matchgroup=rubyStringDelimiter end=+^\z1$+ contains=rubyHeredocStart,@rubyStringSpecial fold keepend

syn region rubyString start=+\%(\%(class\s*\|\%([]}).]\|::\)\)\_s*\|\w\)\@<!<<-\z(\h\w*\)\ze+hs=s+3    matchgroup=rubyStringDelimiter end=+^\s*\zs\z1$+ contains=rubyHeredocStart,@rubyStringSpecial fold keepend
syn region rubyString start=+\%(\%(class\s*\|\%([]}).]\|::\)\)\_s*\|\w\)\@<!<<-"\z([^"]*\)"\ze+hs=s+3  matchgroup=rubyStringDelimiter end=+^\s*\zs\z1$+ contains=rubyHeredocStart,@rubyStringSpecial fold keepend
syn region rubyString start=+\%(\%(class\s*\|\%([]}).]\|::\)\)\_s*\|\w\)\@<!<<-'\z([^']*\)'\ze+hs=s+3  matchgroup=rubyStringDelimiter end=+^\s*\zs\z1$+ contains=rubyHeredocStart		     fold keepend
syn region rubyString start=+\%(\%(class\s*\|\%([]}).]\|::\)\)\_s*\|\w\)\@<!<<-`\z([^`]*\)`\ze+hs=s+3  matchgroup=rubyStringDelimiter end=+^\s*\zs\z1$+ contains=rubyHeredocStart,@rubyStringSpecial fold keepend

if exists('main_syntax') && main_syntax == 'eruby'
  let b:ruby_no_expensive = 1
end

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=rubyConstant
syn match  rubyModuleDeclaration   "[^[:space:];#]\+"	  contained contains=rubyConstant
syn match  rubyFunction "\<[_[:alpha:]][_[:alnum:]]*[?!=]\=[[:alnum:].:?!=]\@!" contained containedin=rubyMethodDeclaration
syn match  rubyFunction "\%(\s\|^\)\@<=[_[:alpha:]][_[:alnum:]]*[?!=]\=\%(\s\|$\)\@=" contained containedin=rubyAliasDeclaration,rubyAliasDeclaration2
syn match  rubyFunction "\%([[:space:].]\|^\)\@<=\%(\[\]=\=\|\*\*\|[+-]@\=\|[*/%|&^~]\|<<\|>>\|[<>]=\=\|<=>\|===\|==\|=\~\|`\)\%([[:space:];#(]\|$\)\@=" contained containedin=rubyAliasDeclaration,rubyAliasDeclaration2,rubyMethodDeclaration

" Expensive Mode - 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  rubyClass	"\<class\>"		nextgroup=rubyClassDeclaration	skipwhite skipnl
  syn match  rubyModule "\<module\>"		nextgroup=rubyModuleDeclaration skipwhite skipnl
  syn region rubyBlock start="\<def\>"		matchgroup=rubyDefine end="\%(\<def\_s\+\)\@<!\<end\>" contains=TOP fold
  syn region rubyBlock start="\<class\>"	matchgroup=rubyClass  end="\<end\>" contains=TOP fold
  syn region rubyBlock start="\<module\>"	matchgroup=rubyModule end="\<end\>" contains=TOP fold

  " modifiers
  syn match  rubyConditionalModifier "\<\%(if\|unless\)\>"   display
  syn match  rubyRepeatModifier	     "\<\%(while\|until\)\>" display

  syn region rubyDoBlock matchgroup=rubyControl start="\<do\>" end="\<end\>" contains=TOP fold
  " curly bracket block or hash literal
  syn region rubyCurlyBlock   start="{" end="}" contains=TOP fold
  syn region rubyArrayLiteral matchgroup=rubyArrayDelimiter start="\%(\w\|[\]})]\)\@<!\[" end="]" contains=TOP fold

  " statements without 'do'
  syn region rubyBlockExpression       matchgroup=rubyControl	  start="\<begin\>" end="\<end\>" contains=TOP fold
  syn region rubyCaseExpression	       matchgroup=rubyConditional start="\<case\>"  end="\<end\>" contains=TOP fold
  syn region rubyConditionalExpression matchgroup=rubyConditional start="\%(\%(^\|\.\.\.\=\|[{:,;([<>~\*/%&^|+=-]\|\%(\<[_[:lower:]][_[:alnum:]]*\)\@<![!?]\)\s*\)\@<=\%(if\|unless\)\>" end="\<end\>" contains=TOP fold

  syn keyword rubyConditional then else when  contained containedin=rubyCaseExpression
  syn keyword rubyConditional then else elsif contained containedin=rubyConditionalExpression

  " 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=TOP
  syn region rubyRepeatExpression start="\<for\>" start="\%(\%(^\|\.\.\.\=\|[{:,;([<>~\*/%&^|+-]\|\%(\<[_[:lower:]][_[:alnum:]]*\)\@<![!=?]\)\s*\)\@<=\<\%(until\|while\)\>" matchgroup=rubyRepeat end="\<end\>" contains=TOP nextgroup=rubyOptionalDoLine fold

  if !exists("ruby_minlines")
    let ruby_minlines = 50
  endif
  exec "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 keyword rubyControl case begin do for if unless while until else elsif then when end
  syn keyword rubyKeyword alias
endif

" Keywords
" Note: the following keywords have already been defined:
" begin case class def do end for if module unless until while
syn keyword rubyControl		and break ensure in next not or redo rescue retry return
syn match   rubyOperator	"\<defined?" display
syn keyword rubyKeyword		super undef yield
syn keyword rubyBoolean		true false
syn keyword rubyPseudoVariable	nil self __FILE__ __LINE__
syn keyword rubyBeginEnd	BEGIN END

" Special Methods
if !exists("ruby_no_special_methods")
  syn keyword rubyAccess    public protected private
  syn keyword rubyAttribute attr 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 extend include load require
  syn keyword rubyKeyword   callcc caller lambda proc
endif

" Comments and Documentation
syn match   rubySharpBang     "\%^#!.*" display
syn keyword rubyTodo	      FIXME NOTE TODO OPTIMIZE XXX contained
syn match   rubyComment       "#.*" contains=rubySharpBang,rubySpaceError,rubyTodo,@Spell
if !exists("ruby_no_comment_fold")
  syn region rubyMultilineComment start="\%(\%(^\s*#.*\n\)\@<!\%(^\s*#.*\n\)\)\%(\(^\s*#.*\n\)\{1,}\)\@=" end="\%(^\s*#.*\n\)\@<=\%(^\s*#.*\n\)\%(^\s*#\)\@!" contains=rubyComment transparent fold keepend
  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
endif

" Note: this is a hack to prevent 'keywords' being highlighted as such when called as methods with an explicit receiver
syn match rubyKeywordAsMethod "\%(\%(\.\@<!\.\)\|::\)\_s*\%(alias\|and\|begin\|break\|case\|class\|def\|defined\|do\|else\)\>"			transparent contains=NONE
syn match rubyKeywordAsMethod "\%(\%(\.\@<!\.\)\|::\)\_s*\%(elsif\|end\|ensure\|false\|for\|if\|in\|module\|next\|nil\)\>"			transparent contains=NONE
syn match rubyKeywordAsMethod "\%(\%(\.\@<!\.\)\|::\)\_s*\%(not\|or\|redo\|rescue\|retry\|return\|self\|super\|then\|true\)\>"			transparent contains=NONE
syn match rubyKeywordAsMethod "\%(\%(\.\@<!\.\)\|::\)\_s*\%(undef\|unless\|until\|when\|while\|yield\|BEGIN\|END\|__FILE__\|__LINE__\)\>"	transparent contains=NONE

syn match rubyKeywordAsMethod "\%(\%(\.\@<!\.\)\|::\)\_s*\%(abort\|at_exit\|attr\|attr_accessor\|attr_reader\)\>"	transparent contains=NONE
syn match rubyKeywordAsMethod "\%(\%(\.\@<!\.\)\|::\)\_s*\%(attr_writer\|autoload\|callcc\|catch\|caller\)\>"		transparent contains=NONE
syn match rubyKeywordAsMethod "\%(\%(\.\@<!\.\)\|::\)\_s*\%(eval\|class_eval\|instance_eval\|module_eval\|exit\)\>"	transparent contains=NONE
syn match rubyKeywordAsMethod "\%(\%(\.\@<!\.\)\|::\)\_s*\%(extend\|fail\|fork\|include\|lambda\)\>"			transparent contains=NONE
syn match rubyKeywordAsMethod "\%(\%(\.\@<!\.\)\|::\)\_s*\%(load\|loop\|private\|proc\|protected\)\>"			transparent contains=NONE
syn match rubyKeywordAsMethod "\%(\%(\.\@<!\.\)\|::\)\_s*\%(public\|require\|raise\|throw\|trap\)\>"			transparent contains=NONE

" __END__ Directive
syn region rubyData matchgroup=rubyDataDirective start="^__END__$" end="\%$" fold

hi def link rubyClass			rubyDefine
hi def link rubyModule			rubyDefine
hi def link rubyDefine			Define
hi def link rubyFunction		Function
hi def link rubyConditional		Conditional
hi def link rubyConditionalModifier	rubyConditional
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 rubyFloat			Float
hi def link rubyBoolean			Boolean
hi def link rubyException		Exception
if !exists("ruby_no_identifiers")
  hi def link rubyIdentifier		Identifier
else
  hi def link rubyIdentifier		NONE
endif
hi def link rubyClassVariable		rubyIdentifier
hi def link rubyConstant		Type
hi def link rubyGlobalVariable		rubyIdentifier
hi def link rubyBlockParameter		rubyIdentifier
hi def link rubyInstanceVariable	rubyIdentifier
hi def link rubyPredefinedIdentifier	rubyIdentifier
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 rubyPseudoOperator		rubyOperator
hi def link rubyBeginEnd		Statement
hi def link rubyAccess			Statement
hi def link rubyAttribute		Statement
hi def link rubyEval			Statement
hi def link rubyPseudoVariable		Constant

hi def link rubyComment			Comment
hi def link rubyData			Comment
hi def link rubyDataDirective		Delimiter
hi def link rubyDocumentation		Comment
hi def link rubyEscape			Special
hi def link rubyInterpolationDelimiter	Delimiter
hi def link rubyNoInterpolation		rubyString
hi def link rubySharpBang		PreProc
hi def link rubyRegexpDelimiter		rubyStringDelimiter
hi def link rubyStringDelimiter		Delimiter
hi def link rubyRegexp			rubyString
hi def link rubyString			String
hi def link rubyTodo			Todo

hi def link rubyInvalidVariable		Error
hi def link rubyError			Error
hi def link rubySpaceError		rubyError

let b:current_syntax = "ruby"

" vim: nowrap sw=2 sts=2 ts=8 noet :