runtime/syntax/yaml.vim

" Vim syntax file
" Language:         YAML (YAML Ain't Markup Language)
" Maintainer:       Nikolai Weibull <now@bitwi.se>
" Latest Revision:  2010-08-12

if exists("b:current_syntax")
  finish
endif

let s:cpo_save = &cpo
set cpo&vim

syn keyword yamlTodo            contained TODO FIXME XXX NOTE

syn region  yamlComment         display oneline start='\%(^\|\s\)#' end='$'
                                \ contains=yamlTodo,@Spell

syn match   yamlNodeProperty    '!\%(![^\\^%     ]\+\|[^!][^:/   ]*\)'

syn match   yamlAnchor          '&.\+'

syn match   yamlAlias           '\*.\+'

syn match   yamlDelimiter       '[-,:]'
syn match   yamlBlock           '[\[\]{}>|]'
syn match   yamlOperator        '[?+-]'
syn match   yamlKey             '\w\+\(\s\+\w\+\)*\ze\s*:'

syn region  yamlString          matchgroup=yamlStringDelimiter
                                \ start=+"+ skip=+\\"+ end=+"+
                                \ contains=yamlEscape
syn region  yamlString          matchgroup=yamlStringDelimiter
                                \ start=+'+ skip=+''+ end=+'+
                                \ contains=yamlSingleEscape
syn match   yamlEscape          contained display +\\[\\"abefnrtv^0_ NLP]+
syn match   yamlEscape          contained display '\\x\x\{2}'
syn match   yamlEscape          contained display '\\u\x\{4}'
syn match   yamlEscape          contained display '\\U\x\{8}'
" TODO: how do we get 0x85, 0x2028, and 0x2029 into this?
syn match   yamlEscape          display '\\\%(\r\n\|[\r\n]\)'
syn match   yamlSingleEscape    contained +''+

" TODO: sexagecimal and fixed (20:30.15 and 1,230.15)
syn match   yamlNumber          display
                                \ '\<[+-]\=\d\+\%(\.\d\+\%([eE][+-]\=\d\+\)\=\)\='
syn match   yamlNumber          display '0\o\+'
syn match   yamlNumber          display '0x\x\+'
syn match   yamlNumber          display '([+-]\=[iI]nf)'
syn match   yamlNumber          display '(NaN)'

syn match   yamlConstant        '\<[~yn]\>'
syn keyword yamlConstant        true True TRUE false False FALSE
syn keyword yamlConstant        yes Yes on ON no No off OFF
syn keyword yamlConstant        null Null NULL nil Nil NIL

syn match   yamlTimestamp       '\d\d\d\d-\%(1[0-2]\|\d\)-\%(3[0-2]\|2\d\|1\d\|\d\)\%( \%([01]\d\|2[0-3]\):[0-5]\d:[0-5]\d.\d\d [+-]\%([01]\d\|2[0-3]\):[0-5]\d\|t\%([01]\d\|2[0-3]\):[0-5]\d:[0-5]\d.\d\d[+-]\%([01]\d\|2[0-3]\):[0-5]\d\|T\%([01]\d\|2[0-3]\):[0-5]\d:[0-5]\d.\dZ\)\='

syn region  yamlDocumentHeader  start='---' end='$' contains=yamlDirective
syn match   yamlDocumentEnd     '\.\.\.'

syn match   yamlDirective       contained '%[^:]\+:.\+'

hi def link yamlTodo            Todo
hi def link yamlComment         Comment
hi def link yamlDocumentHeader  PreProc
hi def link yamlDocumentEnd     PreProc
hi def link yamlDirective       Keyword
hi def link yamlNodeProperty    Type
hi def link yamlAnchor          Type
hi def link yamlAlias           Type
hi def link yamlDelimiter       Delimiter
hi def link yamlBlock           Operator
hi def link yamlOperator        Operator
hi def link yamlKey             Identifier
hi def link yamlString          String
hi def link yamlStringDelimiter yamlString
hi def link yamlEscape          SpecialChar
hi def link yamlSingleEscape    SpecialChar
hi def link yamlNumber          Number
hi def link yamlConstant        Constant
hi def link yamlTimestamp       Number

let b:current_syntax = "yaml"

let &cpo = s:cpo_save
unlet s:cpo_save