" Vim syntax file
" Language: YAML (YAML Ain't Markup Language) 1.2
" Maintainer: Nikolai Pavlov <[email protected]>
" First author: Nikolai Weibull <[email protected]>
" Latest Revision: 2010-10-08

if exists('b:current_syntax')
finish
endif

let s:cpo_save = &cpo
set cpo&vim

let s:ns_char = '\%(\%([\n\r\uFEFF \t]\)\@!\p\)'
let s:ns_word_char = '\%(\w\|-\)'
let s:ns_uri_char = '\%(%\x\x\|'.s:ns_word_char.'\|[#/;?:@&=+$,.!~*''()\[\]]\)'
let s:ns_tag_char = '\%(%\x\x\|'.s:ns_word_char.'\|[#/;?:@&=+$.~*''()]\)'
let s:c_ns_anchor_char = '\%(\%([\n\r\uFEFF \t,\[\]{}]\)\@!\p\)'
let s:c_indicator = '[\-?:,\[\]{}#&*!|>''"%@`]'
let s:c_flow_indicator = '[,\[\]{}]'

let s:c_verbatim_tag = '!<'.s:ns_uri_char.'\+>'
let s:c_named_tag_handle = '!'.s:ns_word_char.'\+!'
let s:c_secondary_tag_handle = '!!'
let s:c_primary_tag_handle = '!'
let s:c_tag_handle = '\%('.s:c_named_tag_handle.
\ '\|'.s:c_secondary_tag_handle.
\ '\|'.s:c_primary_tag_handle.'\)'
let s:c_ns_shorthand_tag = s:c_tag_handle . s:ns_tag_char.'\+'
let s:c_non_specific_tag = '!'
let s:c_ns_tag_property = s:c_verbatim_tag.
\ '\|'.s:c_ns_shorthand_tag.
\ '\|'.s:c_non_specific_tag

let s:c_ns_anchor_name = s:c_ns_anchor_char.'\+'
let s:c_ns_anchor_property = '&'.s:c_ns_anchor_name
let s:c_ns_alias_node = '\*'.s:c_ns_anchor_name

let s:ns_directive_name = s:ns_char.'\+'

let s:ns_local_tag_prefix = '!'.s:ns_uri_char.'*'
let s:ns_global_tag_prefix = s:ns_tag_char.s:ns_uri_char.'*'
let s:ns_tag_prefix = s:ns_local_tag_prefix.
\ '\|'.s:ns_global_tag_prefix

let s:ns_plain_safe_out = s:ns_char
let s:ns_plain_safe_in = '\%('.s:c_flow_indicator.'\@!'.s:ns_char.'\)'

let s:ns_plain_first_in = '\%('.s:c_indicator.'\@!'.s:ns_char.'\|[?:\-]\%('.s:ns_plain_safe_in.'\)\@=\)'
let s:ns_plain_first_out = '\%('.s:c_indicator.'\@!'.s:ns_char.'\|[?:\-]\%('.s:ns_plain_safe_out.'\)\@=\)'

let s:ns_plain_char_in = '\%('.s:ns_char.'#\|:'.s:ns_plain_safe_in.'\|[:#]\@!'.s:ns_plain_safe_in.'\)'
let s:ns_plain_char_out = '\%('.s:ns_char.'#\|:'.s:ns_plain_safe_out.'\|[:#]\@!'.s:ns_plain_safe_out.'\)'

let s:ns_plain_out = s:ns_plain_first_out . s:ns_plain_char_out.'*'
let s:ns_plain_in = s:ns_plain_first_in . s:ns_plain_char_in.'*'


syn keyword yamlTodo contained TODO FIXME XXX NOTE

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

execute 'syn region yamlDirective oneline start='.string('^\ze%'.s:ns_directive_name.'\s\+').' '.
\ 'end="$" '.
\ 'contains=yamlTAGDirective,'.
\ 'yamlYAMLDirective,'.
\ 'yamlReservedDirective '.
\ 'keepend'

syn match yamlTAGDirective '%TAG\s\+' contained nextgroup=yamlTagHandle
execute 'syn match yamlTagHandle contained nextgroup=yamlTagPrefix '.string(s:c_tag_handle.'\s\+')
execute 'syn match yamlTagPrefix contained nextgroup=yamlComment ' . string(s:ns_tag_prefix)

syn match yamlYAMLDirective '%YAML\s\+' contained nextgroup=yamlYAMLVersion
syn match yamlYAMLVersion '\d\+\.\d\+' contained nextgroup=yamlComment

execute 'syn match yamlReservedDirective contained nextgroup=yamlComment '.
\string('%\%(\%(TAG\|YAML\)\s\)\@!'.s:ns_directive_name)

syn region yamlFlowString matchgroup=yamlFlowStringDelimiter start='"' skip='\\"' end='"'
\ contains=yamlEscape
\ nextgroup=yamlKeyValueDelimiter
syn region yamlFlowString matchgroup=yamlFlowStringDelimiter start="'" skip="''" end="'"
\ contains=yamlSingleEscape
\ nextgroup=yamlKeyValueDelimiter
syn match yamlEscape contained '\\\%([\\"abefnrtv\^0_ NLP\n]\|x\x\x\|u\x\{4}\|U\x\{8}\)'
syn match yamlSingleEscape contained "''"

syn match yamlBlockScalarHeader contained '\s\+\zs[|>]\%([+-]\=[1-9]\|[1-9]\=[+-]\)\='

syn cluster yamlFlow contains=yamlFlowString,yamlFlowMapping,yamlFlowCollection
syn cluster yamlFlow add=yamlFlowMappingKey,yamlFlowMappingMerge
syn cluster yamlFlow add=yamlConstant,yamlPlainScalar,yamlFloat
syn cluster yamlFlow add=yamlTimestamp,yamlInteger,yamlMappingKeyStart
syn cluster yamlFlow add=yamlComment
syn region yamlFlowMapping matchgroup=yamlFlowIndicator start='{' end='}' contains=@yamlFlow
syn region yamlFlowCollection matchgroup=yamlFlowIndicator start='\[' end='\]' contains=@yamlFlow

execute 'syn match yamlPlainScalar /'.s:ns_plain_out.'/'
execute 'syn match yamlPlainScalar contained /'.s:ns_plain_in.'/'

syn match yamlMappingKeyStart '?\ze\s'
syn match yamlMappingKeyStart '?' contained

execute 'syn match yamlFlowMappingKey /'.s:ns_plain_in.'\ze\s*:/ contained '.
\'nextgroup=yamlKeyValueDelimiter'
syn match yamlFlowMappingMerge /<<\ze\s*:/ contained nextgroup=yamlKeyValueDelimiter

syn match yamlBlockCollectionItemStart '^\s*\zs-\%(\s\+-\)*\s' nextgroup=yamlBlockMappingKey,yamlBlockMappingMerge
" Use the old regexp engine, the NFA engine doesn't like all the \@ items.
execute 'syn match yamlBlockMappingKey /\%#=1^\s*\zs'.s:ns_plain_out.'\ze\s*:\%(\s\|$\)/ '.
\'nextgroup=yamlKeyValueDelimiter'
execute 'syn match yamlBlockMappingKey /\%#=1\s*\zs'.s:ns_plain_out.'\ze\s*:\%(\s\|$\)/ contained '.
\'nextgroup=yamlKeyValueDelimiter'
syn match yamlBlockMappingMerge /^\s*\zs<<\ze:\%(\s\|$\)/ nextgroup=yamlKeyValueDelimiter
syn match yamlBlockMappingMerge /<<\ze\s*:\%(\s\|$\)/ nextgroup=yamlKeyValueDelimiter contained

syn match yamlKeyValueDelimiter /\s*:/ contained
syn match yamlKeyValueDelimiter /\s*:/ contained

syn keyword yamlConstant true True TRUE false False FALSE
syn keyword yamlConstant null Null NULL
syn match yamlConstant '\<\~\>'

syn match yamlTimestamp /\%([\[\]{}, \t]\@!\p\)\@<!\%(\d\{4}-\d\d\=-\d\d\=\%(\%([Tt]\|\s\+\)\%(\d\d\=\):\%(\d\d\):\%(\d\d\)\%(\.\%(\d*\)\)\=\%(\s*\%(Z\|[+-]\d\d\=\%(:\d\d\)\=\)\)\=\)\=\)\%([\[\]{}, \t]\@!\p\)\@!/

syn match yamlInteger /\%([\[\]{}, \t]\@!\p\)\@<!\%([+-]\=\%(0\%(b[0-1_]\+\|[0-7_]\+\|x[0-9a-fA-F_]\+\)\=\|\%([1-9][0-9_]*\%(:[0-5]\=\d\)\+\)\)\|[1-9][0-9_]*\)\%([\[\]{}, \t]\@!\p\)\@!/
syn match yamlFloat /\%([\[\]{}, \t]\@!\p\)\@<!\%([+-]\=\%(\%(\d[0-9_]*\)\.[0-9_]*\%([eE][+-]\d\+\)\=\|\.[0-9_]\+\%([eE][-+][0-9]\+\)\=\|\d[0-9_]*\%(:[0-5]\=\d\)\+\.[0-9_]*\|\.\%(inf\|Inf\|INF\)\)\|\%(\.\%(nan\|NaN\|NAN\)\)\)\%([\[\]{}, \t]\@!\p\)\@!/

execute 'syn match yamlNodeTag '.string(s:c_ns_tag_property)
execute 'syn match yamlAnchor '.string(s:c_ns_anchor_property)
execute 'syn match yamlAlias '.string(s:c_ns_alias_node)

syn match yamlDocumentStart '^---\ze\%(\s\|$\)'
syn match yamlDocumentEnd '^\.\.\.\ze\%(\s\|$\)'

hi def link yamlTodo Todo
hi def link yamlComment Comment

hi def link yamlDocumentStart PreProc
hi def link yamlDocumentEnd PreProc

hi def link yamlDirectiveName Keyword

hi def link yamlTAGDirective yamlDirectiveName
hi def link yamlTagHandle String
hi def link yamlTagPrefix String

hi def link yamlYAMLDirective yamlDirectiveName
hi def link yamlReservedDirective Error
hi def link yamlYAMLVersion Number

hi def link yamlString String
hi def link yamlFlowString yamlString
hi def link yamlFlowStringDelimiter yamlString
hi def link yamlEscape SpecialChar
hi def link yamlSingleEscape SpecialChar

hi def link yamlBlockCollectionItemStart Label
hi def link yamlBlockMappingKey Identifier
hi def link yamlBlockMappingMerge Special

hi def link yamlFlowMappingKey Identifier
hi def link yamlFlowMappingMerge Special

hi def link yamlMappingKeyStart Special
hi def link yamlFlowIndicator Special
hi def link yamlKeyValueDelimiter Special

hi def link yamlConstant Constant

hi def link yamlAnchor Type
hi def link yamlAlias Type
hi def link yamlNodeTag Type

hi def link yamlInteger Number
hi def link yamlFloat Float
hi def link yamlTimestamp Number

let b:current_syntax = "yaml"

unlet s:ns_word_char s:ns_uri_char s:c_verbatim_tag s:c_named_tag_handle s:c_secondary_tag_handle s:c_primary_tag_handle s:c_tag_handle s:ns_tag_char s:c_ns_shorthand_tag s:c_non_specific_tag s:c_ns_tag_property s:c_ns_anchor_char s:c_ns_anchor_name s:c_ns_anchor_property s:c_ns_alias_node s:ns_char s:ns_directive_name s:ns_local_tag_prefix s:ns_global_tag_prefix s:ns_tag_prefix s:c_indicator s:ns_plain_safe_out s:c_flow_indicator s:ns_plain_safe_in s:ns_plain_first_in s:ns_plain_first_out s:ns_plain_char_in s:ns_plain_char_out s:ns_plain_out s:ns_plain_in

let &cpo = s:cpo_save
unlet s:cpo_save