# HG changeset patch
# User ZyX <[email protected]>
# Date 1427625389 -10800
#      Sun Mar 29 13:36:29 2015 +0300
# Node ID d6e58fa2f6ffa3fdd6bd21eed97d5f42dd56cbf5
# Parent  1f42458bf2e78f36041a349b9d0b100b4ad2a1c8
Update YAML syntax file

Differences:
- Performance of the syntax rules was optimized.
- Syntax file now supports mapping keys which contain spaces.
- Added support for YAML schemas.

diff -r 1f42458bf2e7 -r d6e58fa2f6ff runtime/doc/syntax.txt
--- a/runtime/doc/syntax.txt    Wed Mar 25 20:24:04 2015 +0100
+++ b/runtime/doc/syntax.txt    Sun Mar 29 13:36:29 2015 +0300
@@ -3322,6 +3322,31 @@
 It will look much better with a font in a quadratic cell size, e.g. for X: >
        :set guifont=-*-clean-medium-r-*-*-8-*-*-*-*-80-*
 
+YAML                                           *yaml.vim* *ft-yaml-syntax*
+
+                                       *g:yaml_schema* *b:yaml_schema*
+A YAML schema is a combination of a set of tags and a mechanism for resolving 
+non-specific tags. For user this means that YAML parser may, depending on 
+plain scalar contents, treat plain scalar (which can actually be only string 
+and nothing else) as a value of the other type: null, boolean, floating-point, 
+integer. `g:yaml_schema` option determines according to which schema values 
+will be highlighted specially. Supported schemas are
+
+Schema         Description ~
+failsafe       No additional highlighting.
+json           Supports JSON-style numbers, booleans and null.
+core           Supports more number, boolean and null styles.
+pyyaml         In addition to core schema supports highlighting timestamps, 
+               but there are some differences in what is recognized as 
+               numbers and many additional boolean values not present in core 
+               schema.
+
+Default schema is `core`.
+
+Note that schemas are not actually limited to plain scalars, but this is the 
+only difference between schemas defined in YAML specification and the only 
+difference defined in the syntax file.
+
 ==============================================================================
 5. Defining a syntax                                   *:syn-define* *E410*
 
diff -r 1f42458bf2e7 -r d6e58fa2f6ff runtime/syntax/yaml.vim
--- a/runtime/syntax/yaml.vim   Wed Mar 25 20:24:04 2015 +0100
+++ b/runtime/syntax/yaml.vim   Sun Mar 29 13:36:29 2015 +0300
@@ -11,13 +11,40 @@
 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.'\|[#/;?:@&=+$,.!~*''()\[\]]\)'
+" Choose the schema to use
+" TODO: Validate schema
+if !exists('b:yaml_schema')
+  if exists('g:yaml_schema')
+    let b:yaml_schema = g:yaml_schema
+  else
+    let b:yaml_schema = 'core'
+  endif
+endif
+
+let s:ns_char = '\%([\n\r\uFEFF \t]\@!\p\)'
+let s:ns_word_char = '[[:alnum:]_\-]'
+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_ns_anchor_char = '\%([\n\r\uFEFF \t,[\]{}]\@!\p\)'
+let s:c_indicator      = '[\-?:,[\]{}#&*!|>''"%@`]'
+let s:c_flow_indicator = '[,[\]{}]'
+
+let s:ns_char_without_c_indicator = substitute(s:ns_char, '\v\C[\zs', 
'\=s:c_indicator[1:-2]', '')
+
+let s:_collection = '[^\@!\(\%(\\\.\|\[^\\\]]\)\+\)]'
+let s:_neg_collection = '[^\(\%(\\\.\|\[^\\\]]\)\+\)]'
+function s:SimplifyToAssumeAllPrintable(p)
+    return substitute(a:p, '\V\C\\%('.s:_collection.'\\@!\\p\\)', '[^\1]', '')
+endfunction
+let s:ns_char = s:SimplifyToAssumeAllPrintable(s:ns_char)
+let s:ns_char_without_c_indicator = 
s:SimplifyToAssumeAllPrintable(s:ns_char_without_c_indicator)
+let s:c_ns_anchor_char = s:SimplifyToAssumeAllPrintable(s:c_ns_anchor_char)
+
+function s:SimplifyAdjacentCollections(p)
+    return substitute(a:p, '\V\C'.s:_collection.'\\|'.s:_collection, '[\1\2]', 
'g')
+endfunction
+let s:ns_uri_char = s:SimplifyAdjacentCollections(s:ns_uri_char)
+let s:ns_tag_char = s:SimplifyAdjacentCollections(s:ns_tag_char)
 
 let s:c_verbatim_tag = '!<'.s:ns_uri_char.'\+>'
 let s:c_named_tag_handle     = '!'.s:ns_word_char.'\+!'
@@ -46,11 +73,15 @@
 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_safe_in = substitute(s:ns_plain_safe_in, 
'\V\C\\%('.s:_collection.'\\@!'.s:_neg_collection.'\\)', '[^\1\2]', '')
+let s:ns_plain_safe_in_without_colhash = substitute(s:ns_plain_safe_in, 
'\V\C'.s:_neg_collection, '[^\1:#]', '')
+let s:ns_plain_safe_out_without_colhash = substitute(s:ns_plain_safe_out, 
'\V\C'.s:_neg_collection, '[^\1:#]', '')
 
-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_first_in  = 
'\%('.s:ns_char_without_c_indicator.'\|[?:\-]\%('.s:ns_plain_safe_in.'\)\@=\)'
+let s:ns_plain_first_out = 
'\%('.s:ns_char_without_c_indicator.'\|[?:\-]\%('.s:ns_plain_safe_out.'\)\@=\)'
+
+let s:ns_plain_char_in  = 
'\%('.s:ns_char.'#\|:'.s:ns_plain_safe_in.'\|'.s:ns_plain_safe_in_without_colhash.'\)'
+let s:ns_plain_char_out = 
'\%('.s:ns_char.'#\|:'.s:ns_plain_safe_out.'\|'.s:ns_plain_safe_out_without_colhash.'\)'
 
 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.'*'
@@ -89,9 +120,11 @@
 
 syn match yamlBlockScalarHeader contained 
'\s\+\zs[|>]\%([+-]\=[1-9]\|[1-9]\=[+-]\)\='
 
+syn cluster yamlConstant contains=yamlBool,yamlNull
+
 syn cluster yamlFlow contains=yamlFlowString,yamlFlowMapping,yamlFlowCollection
 syn cluster yamlFlow      add=yamlFlowMappingKey,yamlFlowMappingMerge
-syn cluster yamlFlow      add=yamlConstant,yamlPlainScalar,yamlFloat
+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
@@ -103,15 +136,15 @@
 syn match yamlMappingKeyStart '?\ze\s'
 syn match yamlMappingKeyStart '?' contained
 
-execute 'syn match yamlFlowMappingKey /'.s:ns_plain_in.'\ze\s*:/ contained '.
+execute 'syn match yamlFlowMappingKey 
/\%#=1'.s:ns_plain_in.'\%(\s\+'.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\|$\)/ '.
+execute 'syn match yamlBlockMappingKey 
/\%#=1^\s*\zs'.s:ns_plain_out.'\%(\s\+'.s:ns_plain_out.'\)*\ze\s*:\%(\s\|$\)/ '.
             \'nextgroup=yamlKeyValueDelimiter'
-execute 'syn match yamlBlockMappingKey 
/\%#=1\s*\zs'.s:ns_plain_out.'\ze\s*:\%(\s\|$\)/ contained '.
+execute 'syn match yamlBlockMappingKey 
/\%#=1\s*\zs'.s:ns_plain_out.'\%(\s\+'.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
@@ -119,14 +152,32 @@
 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 cluster yamlScalarWithSpecials 
contains=yamlPlainScalar,yamlBlockMappingKey,yamlFlowMappingKey
 
-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\)\@!/
+let s:_bounder = s:SimplifyToAssumeAllPrintable('\%([[\]{}, \t]\@!\p\)')
+if b:yaml_schema is# 'json'
+    syn keyword yamlNull null contained containedin=@yamlScalarWithSpecials
+    syn keyword yamlBool true false
+    exe 'syn match   yamlInteger 
/'.s:_bounder.'\@1<!\%(0\|-\=[1-9][0-9]*\)'.s:_bounder.'\@!/ contained 
containedin=@yamlScalarWithSpecials'
+    exe 'syn match   yamlFloat   
/'.s:_bounder.'\@1<!\%(-\=[1-9][0-9]*\%(\.[0-9]*\)\=\(e[-+]\=[0-9]\+\)\=\|0\|-\=\.inf\|\.nan\)'.s:_bounder.'\@!/
 contained containedin=@yamlScalarWithSpecials'
+elseif b:yaml_schema is# 'core'
+    syn keyword yamlNull null Null NULL contained 
containedin=@yamlScalarWithSpecials
+    syn keyword yamlBool true True TRUE false False FALSE contained 
containedin=@yamlScalarWithSpecials
+    exe 'syn match   yamlNull /'.s:_bounder.'\@1<!\~'.s:_bounder.'\@!/ 
contained containedin=@yamlScalarWithSpecials'
+    exe 'syn match   yamlInteger 
/'.s:_bounder.'\@1<!\%([+-]\=\%(0\%(b[0-1_]\+\|[0-7_]\+\|x[0-9a-fA-F_]\+\)\=\|\%([1-9][0-9_]*\%(:[0-5]\=\d\)\+\)\)\|[1-9][0-9_]*\)'.s:_bounder.'\@!/
 contained containedin=@yamlScalarWithSpecials'
+    exe 'syn match   yamlFloat 
/'.s:_bounder.'\@1<!\%([+-]\=\%(\%(\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\)\)\)'.s:_bounder.'\@!/
 contained containedin=@yamlScalarWithSpecials'
+elseif b:yaml_schema is# 'pyyaml'
+    syn keyword yamlNull null Null NULL contained 
containedin=@yamlScalarWithSpecials
+    syn keyword yamlBool true True TRUE false False FALSE yes Yes YES no No NO 
on On ON off Off OFF contained containedin=@yamlScalarWithSpecials
+    exe 'syn match   yamlNull /'.s:_bounder.'\@1<!\~'.s:_bounder.'\@!/ 
contained containedin=@yamlScalarWithSpecials'
+    exe 'syn match  yamlFloat 
/'.s:_bounder.'\@1<!\%(\v[-+]?%(\d[0-9_]*)\.[0-9_]*%([eE][-+]\d+)?|\.[0-9_]+%([eE][-+]\d+)?|[-+]?\d[0-9_]*%(\:[0-5]?\d)+\.[0-9_]*|[-+]?\.%(inf|Inf|INF)|\.%(nan|NaN|NAN)\m\)'.s:_bounder.'\@!/
 contained containedin=@yamlScalarWithSpecials'
+    exe 'syn match  yamlInteger 
/'.s:_bounder.'\@1<!\%(\v[-+]?0b[0-1_]+|[-+]?0[0-7_]+|[-+]?%(0|[1-9][0-9_]*)|[-+]?0x[0-9a-fA-F_]+|[-+]?[1-9][0-9_]*%(:[0-5]?\d)+\m\)'.s:_bounder.'\@!/
 contained containedin=@yamlScalarWithSpecials'
+    exe 'syn match  yamlTimestamp 
/'.s:_bounder.'\@1<!\%(\v\d\d\d\d\-\d\d\-\d\d|\d\d\d\d \-\d\d? \-\d\d?%([Tt]|[ 
\t]+)\d\d?\:\d\d \:\d\d %(\.\d*)?%([ 
\t]*%(Z|[-+]\d\d?%(\:\d\d)?))?\m\)'.s:_bounder.'\@!/ contained 
containedin=@yamlScalarWithSpecials'
+elseif b:yaml_schema is# 'failsafe'
+    " Nothing
+endif
+unlet s:_bounder
 
-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)
@@ -170,6 +221,9 @@
 
 hi def link yamlConstant                 Constant
 
+hi def link yamlNull                     yamlConstant
+hi def link yamlBool                     yamlConstant
+
 hi def link yamlAnchor                   Type
 hi def link yamlAlias                    Type
 hi def link yamlNodeTag                  Type
@@ -180,8 +234,10 @@
 
 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
+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 s:ns_char_without_c_indicator 
s:ns_plain_safe_in_without_colhash s:ns_plain_safe_out_without_colhash
+unlet s:_collection s:_neg_collection
+delfunction s:SimplifyAdjacentCollections
+delfunction s:SimplifyToAssumeAllPrintable
 
 let &cpo = s:cpo_save
 unlet s:cpo_save
-

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diff -crN vim-small-patches.1f42458bf2e7/runtime/doc/syntax.txt vim-small-patches/runtime/doc/syntax.txt
*** vim-small-patches.1f42458bf2e7/runtime/doc/syntax.txt	2015-03-29 13:37:20.786568923 +0300
--- vim-small-patches/runtime/doc/syntax.txt	2015-03-29 13:37:20.796558928 +0300
***************
*** 3322,3327 ****
--- 3322,3352 ----
  It will look much better with a font in a quadratic cell size, e.g. for X: >
  	:set guifont=-*-clean-medium-r-*-*-8-*-*-*-*-80-*
  
+ YAML						*yaml.vim* *ft-yaml-syntax*
+ 
+ 					*g:yaml_schema* *b:yaml_schema*
+ A YAML schema is a combination of a set of tags and a mechanism for resolving 
+ non-specific tags. For user this means that YAML parser may, depending on 
+ plain scalar contents, treat plain scalar (which can actually be only string 
+ and nothing else) as a value of the other type: null, boolean, floating-point, 
+ integer. `g:yaml_schema` option determines according to which schema values 
+ will be highlighted specially. Supported schemas are
+ 
+ Schema		Description ~
+ failsafe	No additional highlighting.
+ json		Supports JSON-style numbers, booleans and null.
+ core		Supports more number, boolean and null styles.
+ pyyaml		In addition to core schema supports highlighting timestamps, 
+ 		but there are some differences in what is recognized as 
+ 		numbers and many additional boolean values not present in core 
+ 		schema.
+ 
+ Default schema is `core`.
+ 
+ Note that schemas are not actually limited to plain scalars, but this is the 
+ only difference between schemas defined in YAML specification and the only 
+ difference defined in the syntax file.
+ 
  ==============================================================================
  5. Defining a syntax					*:syn-define* *E410*
  
diff -crN vim-small-patches.1f42458bf2e7/runtime/syntax/yaml.vim vim-small-patches/runtime/syntax/yaml.vim
*** vim-small-patches.1f42458bf2e7/runtime/syntax/yaml.vim	2015-03-29 13:37:20.796558928 +0300
--- vim-small-patches/runtime/syntax/yaml.vim	2015-03-29 13:37:20.796558928 +0300
***************
*** 11,23 ****
  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.'\+!'
--- 11,50 ----
  let s:cpo_save = &cpo
  set cpo&vim
  
! " Choose the schema to use
! " TODO: Validate schema
! if !exists('b:yaml_schema')
!   if exists('g:yaml_schema')
!     let b:yaml_schema = g:yaml_schema
!   else
!     let b:yaml_schema = 'core'
!   endif
! endif
! 
! let s:ns_char = '\%([\n\r\uFEFF \t]\@!\p\)'
! let s:ns_word_char = '[[:alnum:]_\-]'
! 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:ns_char_without_c_indicator = substitute(s:ns_char, '\v\C[\zs', '\=s:c_indicator[1:-2]', '')
! 
! let s:_collection = '[^\@!\(\%(\\\.\|\[^\\\]]\)\+\)]'
! let s:_neg_collection = '[^\(\%(\\\.\|\[^\\\]]\)\+\)]'
! function s:SimplifyToAssumeAllPrintable(p)
!     return substitute(a:p, '\V\C\\%('.s:_collection.'\\@!\\p\\)', '[^\1]', '')
! endfunction
! let s:ns_char = s:SimplifyToAssumeAllPrintable(s:ns_char)
! let s:ns_char_without_c_indicator = s:SimplifyToAssumeAllPrintable(s:ns_char_without_c_indicator)
! let s:c_ns_anchor_char = s:SimplifyToAssumeAllPrintable(s:c_ns_anchor_char)
! 
! function s:SimplifyAdjacentCollections(p)
!     return substitute(a:p, '\V\C'.s:_collection.'\\|'.s:_collection, '[\1\2]', 'g')
! endfunction
! let s:ns_uri_char = s:SimplifyAdjacentCollections(s:ns_uri_char)
! let s:ns_tag_char = s:SimplifyAdjacentCollections(s:ns_tag_char)
  
  let s:c_verbatim_tag = '!<'.s:ns_uri_char.'\+>'
  let s:c_named_tag_handle     = '!'.s:ns_word_char.'\+!'
***************
*** 46,56 ****
  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.'*'
--- 73,87 ----
  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_safe_in = substitute(s:ns_plain_safe_in, '\V\C\\%('.s:_collection.'\\@!'.s:_neg_collection.'\\)', '[^\1\2]', '')
! let s:ns_plain_safe_in_without_colhash = substitute(s:ns_plain_safe_in, '\V\C'.s:_neg_collection, '[^\1:#]', '')
! let s:ns_plain_safe_out_without_colhash = substitute(s:ns_plain_safe_out, '\V\C'.s:_neg_collection, '[^\1:#]', '')
  
! let s:ns_plain_first_in  = '\%('.s:ns_char_without_c_indicator.'\|[?:\-]\%('.s:ns_plain_safe_in.'\)\@=\)'
! let s:ns_plain_first_out = '\%('.s:ns_char_without_c_indicator.'\|[?:\-]\%('.s:ns_plain_safe_out.'\)\@=\)'
! 
! let s:ns_plain_char_in  = '\%('.s:ns_char.'#\|:'.s:ns_plain_safe_in.'\|'.s:ns_plain_safe_in_without_colhash.'\)'
! let s:ns_plain_char_out = '\%('.s:ns_char.'#\|:'.s:ns_plain_safe_out.'\|'.s:ns_plain_safe_out_without_colhash.'\)'
  
  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.'*'
***************
*** 89,97 ****
  
  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
--- 120,130 ----
  
  syn match yamlBlockScalarHeader contained '\s\+\zs[|>]\%([+-]\=[1-9]\|[1-9]\=[+-]\)\='
  
+ syn cluster yamlConstant contains=yamlBool,yamlNull
+ 
  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
***************
*** 103,117 ****
  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
--- 136,150 ----
  syn match yamlMappingKeyStart '?\ze\s'
  syn match yamlMappingKeyStart '?' contained
  
! execute 'syn match yamlFlowMappingKey /\%#=1'.s:ns_plain_in.'\%(\s\+'.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.'\%(\s\+'.s:ns_plain_out.'\)*\ze\s*:\%(\s\|$\)/ '.
              \'nextgroup=yamlKeyValueDelimiter'
! execute 'syn match yamlBlockMappingKey /\%#=1\s*\zs'.s:ns_plain_out.'\%(\s\+'.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
***************
*** 119,132 ****
  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)
--- 152,183 ----
  syn match   yamlKeyValueDelimiter /\s*:/ contained
  syn match   yamlKeyValueDelimiter /\s*:/ contained
  
! syn cluster yamlScalarWithSpecials contains=yamlPlainScalar,yamlBlockMappingKey,yamlFlowMappingKey
  
! let s:_bounder = s:SimplifyToAssumeAllPrintable('\%([[\]{}, \t]\@!\p\)')
! if b:yaml_schema is# 'json'
!     syn keyword yamlNull null contained containedin=@yamlScalarWithSpecials
!     syn keyword yamlBool true false
!     exe 'syn match   yamlInteger /'.s:_bounder.'\@1<!\%(0\|-\=[1-9][0-9]*\)'.s:_bounder.'\@!/ contained containedin=@yamlScalarWithSpecials'
!     exe 'syn match   yamlFloat   /'.s:_bounder.'\@1<!\%(-\=[1-9][0-9]*\%(\.[0-9]*\)\=\(e[-+]\=[0-9]\+\)\=\|0\|-\=\.inf\|\.nan\)'.s:_bounder.'\@!/ contained containedin=@yamlScalarWithSpecials'
! elseif b:yaml_schema is# 'core'
!     syn keyword yamlNull null Null NULL contained containedin=@yamlScalarWithSpecials
!     syn keyword yamlBool true True TRUE false False FALSE contained containedin=@yamlScalarWithSpecials
!     exe 'syn match   yamlNull /'.s:_bounder.'\@1<!\~'.s:_bounder.'\@!/ contained containedin=@yamlScalarWithSpecials'
!     exe 'syn match   yamlInteger /'.s:_bounder.'\@1<!\%([+-]\=\%(0\%(b[0-1_]\+\|[0-7_]\+\|x[0-9a-fA-F_]\+\)\=\|\%([1-9][0-9_]*\%(:[0-5]\=\d\)\+\)\)\|[1-9][0-9_]*\)'.s:_bounder.'\@!/ contained containedin=@yamlScalarWithSpecials'
!     exe 'syn match   yamlFloat /'.s:_bounder.'\@1<!\%([+-]\=\%(\%(\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\)\)\)'.s:_bounder.'\@!/ contained containedin=@yamlScalarWithSpecials'
! elseif b:yaml_schema is# 'pyyaml'
!     syn keyword yamlNull null Null NULL contained containedin=@yamlScalarWithSpecials
!     syn keyword yamlBool true True TRUE false False FALSE yes Yes YES no No NO on On ON off Off OFF contained containedin=@yamlScalarWithSpecials
!     exe 'syn match   yamlNull /'.s:_bounder.'\@1<!\~'.s:_bounder.'\@!/ contained containedin=@yamlScalarWithSpecials'
!     exe 'syn match  yamlFloat /'.s:_bounder.'\@1<!\%(\v[-+]?%(\d[0-9_]*)\.[0-9_]*%([eE][-+]\d+)?|\.[0-9_]+%([eE][-+]\d+)?|[-+]?\d[0-9_]*%(\:[0-5]?\d)+\.[0-9_]*|[-+]?\.%(inf|Inf|INF)|\.%(nan|NaN|NAN)\m\)'.s:_bounder.'\@!/ contained containedin=@yamlScalarWithSpecials'
!     exe 'syn match  yamlInteger /'.s:_bounder.'\@1<!\%(\v[-+]?0b[0-1_]+|[-+]?0[0-7_]+|[-+]?%(0|[1-9][0-9_]*)|[-+]?0x[0-9a-fA-F_]+|[-+]?[1-9][0-9_]*%(:[0-5]?\d)+\m\)'.s:_bounder.'\@!/ contained containedin=@yamlScalarWithSpecials'
!     exe 'syn match  yamlTimestamp /'.s:_bounder.'\@1<!\%(\v\d\d\d\d\-\d\d\-\d\d|\d\d\d\d \-\d\d? \-\d\d?%([Tt]|[ \t]+)\d\d?\:\d\d \:\d\d %(\.\d*)?%([ \t]*%(Z|[-+]\d\d?%(\:\d\d)?))?\m\)'.s:_bounder.'\@!/ contained containedin=@yamlScalarWithSpecials'
! elseif b:yaml_schema is# 'failsafe'
!     " Nothing
! endif
! unlet s:_bounder
  
  
  execute 'syn match yamlNodeTag '.string(s:c_ns_tag_property)
  execute 'syn match yamlAnchor  '.string(s:c_ns_anchor_property)
***************
*** 170,175 ****
--- 221,229 ----
  
  hi def link yamlConstant                 Constant
  
+ hi def link yamlNull                     yamlConstant
+ hi def link yamlBool                     yamlConstant
+ 
  hi def link yamlAnchor                   Type
  hi def link yamlAlias                    Type
  hi def link yamlNodeTag                  Type
***************
*** 180,187 ****
  
  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
- 
--- 234,243 ----
  
  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 s:ns_char_without_c_indicator s:ns_plain_safe_in_without_colhash s:ns_plain_safe_out_without_colhash
! unlet s:_collection s:_neg_collection
! delfunction s:SimplifyAdjacentCollections
! delfunction s:SimplifyToAssumeAllPrintable
  
  let &cpo = s:cpo_save
  unlet s:cpo_save

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