I have written a syntax file for YAML markup language that has the following differencies with runtime/syntax/yaml.vim from mercurial repository:
1. It is higlights YAML-1.2, not YAML-1.1
2. Improved directive detection and higlighting (official was not able to
properly detect YAML directives at all).
3. Better dictionary key higlighting (official was not able to highlight even
key like ``a-b'', my can higlight ``a{b'')
4. Better number detection (official lacked sexadecimal numbers and proper
number boundaries detection, there also were errors in special values (NaN and
Inf) detection)
5. Improved anchor, alias and tag detection
6. Improved document end detection
7. Added `merge' key detection
8. Removed obsolete YAML-1.1 keywords
Please, consider including it in the official distribution.
" Vim syntax file " Language: YAML (YAML Ain't Markup Language) 1.2 " Maintainer: Nikolai Weibull <[email protected]> " Latest Revision: 2010-09-01 if exists('b:current_syntax') finish endif let s:cpo_save = &cpo set cpo&vim let s:ns_word_char='\%(\w\|-\)' let s:ns_uri_char='\%(%\x\x\|'.s:ns_word_char.'\|[#/;?:@&=+$,.!~*''()\[\]]\)' 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:ns_tag_char='\%(%\x\x\|'.s:ns_word_char.'\|[#/;?:@&=+$.~*''()]\)' 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_char='\%(\%([\n\r\uFEFF \t,\[\]{}]\)\...@!\p\)' 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_char='\%(\%([\n\r\uFEFF \t]\)\...@!\p\)' 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:c_indicator='[\-?:,\[\]{}#&*!|>''"%...@`]' let s:ns_plain_safe_out=s:ns_char let s:c_flow_indicator='[,\[\]{}]' 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 region yamlFlowMapping matchgroup=yamlFlowIndicator start='{' end='}' \ contains=yamlFlowString,yamlFlowMapping,yamlFlowCollection,yamlFlowMappingKey,yamlFlowMappingMerge,yamlConstant,yamlPlainScalar,yamlFloat,yamlTimestamp,yamlInteger,yamlMappingKeyStart,yamlComment syn region yamlFlowCollection matchgroup=yamlFlowIndicator start='\[' end='\]' \ contains=yamlFlowString,yamlFlowMapping,yamlFlowCollection,yamlFlowMappingKey,yamlFlowMappingMerge,yamlConstant,yamlPlainScalar,yamlFloat,yamlTimestamp,yamlInteger,yamlMappingKeyStart,yamlComment 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 execute 'syn match yamlBlockMappingKey /^\s*\zs'.s:ns_plain_out.'\ze\s*:\%(\s\|$\)/ '. \'nextgroup=yamlKeyValueDelimiter' execute 'syn match yamlBlockMappingKey /\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 /\%([\[\]{}, \...@!\p\)\@<!\%(\d\{4}-\d\d\=-\d\d\=\%(\%([Tt]\|\s\+\)\%(\d\d\=\):\%(\d\d\):\%(\d\d\)\%(\.\%(\d*\)\)\=\%(\s*\%(Z\|[+-]\d\d\=\%(:\d\d\)\=\)\)\=\)\=\)\%([\[\]{}, \...@!\p\)\...@!/ syn match yamlInteger /\%([\[\]{}, \...@!\p\)\@<!\%([+-]\=\%(0\%(b[0-1_]\+\|[0-7_]\+\|x[0-9a-fA-F_]\+\)\=\|\%([1-9][0-9_]*\%(:[0-5]\=\d\)\+\)\)\)\%([\[\]{}, \...@!\p\)\...@!/ syn match yamlFloat /\%([\[\]{}, \...@!\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\)\)\)\%([\[\]{}, \...@!\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
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