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view runtime/syntax/sisu.vim @ 33096:828bcb1a37e7 v9.0.1833

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patch 9.0.1833: [security] runtime file fixes Commit: https://github.com/vim/vim/commit/816fbcc262687b81fc46f82f7bbeb1453addfe0c Author: Christian Brabandt <cb@256bit.org> Date: Thu Aug 31 23:52:30 2023 +0200 patch 9.0.1833: [security] runtime file fixes Problem: runtime files may execute code in current dir Solution: only execute, if not run from current directory The perl, zig and ruby filetype plugins and the zip and gzip autoload plugins may try to load malicious executable files from the current working directory. This is especially a problem on windows, where the current directory is implicitly in your $PATH and windows may even run a file with the extension `.bat` because of $PATHEXT. So make sure that we are not trying to execute a file from the current directory. If this would be the case, error out (for the zip and gzip) plugins or silently do not run those commands (for the ftplugins). This assumes, that only the current working directory is bad. For all other directories, it is assumed that those directories were intentionally set to the $PATH by the user. Signed-off-by: Christian Brabandt <cb@256bit.org>
author Christian Brabandt <cb@256bit.org>
date Fri, 01 Sep 2023 00:00:02 +0200
parents 49c12c93abf3
children
line wrap: on
line source

" SiSU Vim syntax file
" SiSU Maintainer: Ralph Amissah <ralph.amissah@gmail.com>
" SiSU Markup:     SiSU (sisu-5.6.7)
" Last Change:     2017 Jun 22
" URL: <http://git.sisudoc.org/gitweb/?p=code/sisu.git;a=blob;f=data/sisu/conf/editor-syntax-etc/vim/syntax/sisu.vim;hb=HEAD>
"      <http://git.sisudoc.org/gitweb/?p=code/sisu.git;a=blob_plain;f=data/sisu/conf/editor-syntax-etc/vim/syntax/sisu.vim;hb=HEAD>
"(originally looked at Ruby Vim by Mirko Nasato)

" quit when a syntax file was already loaded
if exists("b:current_syntax")
  finish
endif
let s:cpo_save = &cpo
set cpo&vim

"% "Errors:
syn match sisu_error contains=sisu_link,sisu_error_wspace "<![^ei]\S\+!>"

"% "Markers Identifiers:
if !exists("sisu_no_identifiers")
  syn match   sisu_mark_endnote                                           "\~^"
  syn match   sisu_break               contains=@NoSpell                  " \\\\\( \|$\)\|<br>\|<br />"
  syn match   sisu_control             contains=@NoSpell                  "^\(-\\\\-\|=\\\\=\|-\.\.-\|<:p[bn]>\)\s*$"
  syn match   sisu_control             contains=@NoSpell                  "^<:\(bo\|---\)>\s*$"
  syn match   sisu_marktail            contains=@NoSpell                  "^--[+~-]#\s*$"
  syn match   sisu_marktail                                               "[~-]#"
  syn match   sisu_control                                                "\""
  syn match   sisu_underline                                              "\(^\| \)_[a-zA-Z0-9]\+_\([ .,]\|$\)"
  syn match   sisu_number              contains=@NoSpell                  "[0-9a-f]\{32\}\|[0-9a-f]\{64\}"
  syn match   sisu_link                contains=@NoSpell                  "\(_\?https\?://\|\.\.\/\)\S\+"
  syn match   sisu_link                                                   " \*\~\S\+"
  syn match   sisu_require             contains=@NoSpell                  "^<<\s*[a-zA-Z0-9^./_-]\+\.ss[it]$"
  syn match   sisu_structure                                              "^:A\~$"

"% "Document Sub Headers:
  syn match   sisu_sub_header_title                                       "^\s\+:\(subtitle\|short\|edition\|language\|lang_char\|note\):\s" "group=sisu_header_content
  syn match   sisu_sub_header_creator                                     "^\s\+:\(author\|editor\|contributor\|illustrator\|photographer\|translator\|digitized_by\|prepared_by\|audio\|video\):\s"                               " &hon &institution
  syn match   sisu_sub_header_rights                                      "^\s\+:\(copyright\|text\|translation\|illustrations\|photographs\|preparation\|digitization\|audio\|video\|license\|all\):\s"                   " access_rights license
  syn match   sisu_sub_header_classify                                    "^\s\+:\(topic_register\|keywords\|subject\|dewey\|loc\):\s"
  syn match   sisu_sub_header_identifier                                  "^\s\+:\(oclc\|isbn\):\s"
  syn match   sisu_sub_header_date                                        "^\s\+:\(added_to_site\|available\|created\|issued\|modified\|published\|valid\|translated\|original_publication\):\s"
  syn match   sisu_sub_header_original                                    "^\s\+:\(publisher\|date\|language\|lang_char\|institution\|nationality\|source\):\s"
  syn match   sisu_sub_header_make                                        "^\s\+:\(headings\|num_top\|breaks\|language\|italics\|bold\|emphasis\|substitute\|omit\|plaintext_wrap\|texpdf_font_mono\|texpdf_font\|stamp\|promo\|ad\|manpage\|home_button_text\|home_button_image\|cover_image\|footer\):\s"
  syn match   sisu_sub_header_notes                                       "^\s\+:\(description\|abstract\|comment\|coverage\|relation\|source\|history\|type\|format\|prefix\|prefix_[ab]\|suffix\):\s"
  syn match   sisu_within_index_ignore                                    "\S\+[:;]\(\s\+\|$\)"
  syn match   sisu_within_index                                           "[:|;]\|+\d\+"

"% "semantic markers: (ignore)
  syn match   sisu_sem_marker                                             ";{\|};[a-z._]*[a-z]"
  syn match   sisu_sem_marker_block                                       "\([a-z][a-z._]*\|\):{\|}:[a-z._]*[a-z]"
  syn match   sisu_sem_ex_marker                                          ";\[\|\];[a-z._]*[a-z]"
  syn match   sisu_sem_ex_marker_block                                    "\([a-z][a-z._]*\|\):\[\|\]:[a-z._]*[a-z]"
  syn match   sisu_sem_block contains=sisu_error,sisu_error_wspace,sisu_content_alt,sisu_link,sisu_linked,sisu_break,sisu_sem_block,sisu_sem_content,sisu_sem_marker_block,sisu_sem_marker,sisu_sem_ex_marker_block,sisu_sem_ex_marker,sisu_mark_endnote,sisu_content_endnote "\([a-z]*\):{[^}].\{-}}:\1"
  syn match   sisu_sem_content contains=sisu_error,sisu_error_wspace,sisu_content_alt,sisu_link,sisu_linked,sisu_break,sisu_sem_marker_block,sisu_sem_marker,sisu_sem_ex_marker_block,sisu_sem_ex_marker ";{[^}].\{-}};[a-z]\+"
  syn match   sisu_sem_ex_block contains=sisu_error,sisu_error_wspace,sisu_content_alt,sisu_link,sisu_linked,sisu_break,sisu_sem_block,sisu_sem_content,sisu_sem_marker_block,sisu_sem_marker,sisu_sem_ex_marker_block,sisu_sem_ex_marker,sisu_mark_endnote,sisu_content_endnote "\([a-z]*\):\[[^}].\{-}\]:\1"
  syn match   sisu_sem_ex_content contains=sisu_error,sisu_error_wspace,sisu_content_alt,sisu_link,sisu_linked,sisu_break,sisu_sem_marker_block,sisu_sem_marker,sisu_sem_ex_marker_block,sisu_sem_ex_marker ";\[[^}].\{-}\];[a-z]\+"
endif

"% "URLs Numbers And ASCII Codes:
syn match   sisu_number                              "\<\(0x\x\+\|0b[01]\+\|0\o\+\|0\.\d\+\|0\|[1-9][\.0-9_]*\)\>"
syn match   sisu_number                              "?\(\\M-\\C-\|\\c\|\\C-\|\\M-\)\=\(\\\o\{3}\|\\x\x\{2}\|\\\=\w\)"

"% "Tuned Error: (is error if not already matched)
syn match sisu_error             contains=sisu_error "[\~/\*!_]{\|}[\~/\*!_]"
syn match sisu_error             contains=sisu_error "<a href\|</a>]"

"% "Simple Paired Enclosed Markup:
"url/link
syn region sisu_link contains=sisu_error,sisu_error_wspace matchgroup=sisu_action start="^<<\s*|[a-zA-Z0-9^._-]\+|@|[a-zA-Z0-9^._-]\+|"rs=s+2 end="$"

"% "Document Header:
" title
syn region sisu_header_content contains=sisu_error,sisu_comment,sisu_break,sisu_link,sisu_sub_header_title matchgroup=sisu_header start="^[@]title:[+-]\?\(\s\|\n\)"rs=e-1 end="\n$"
" creator
syn region sisu_header_content contains=sisu_error,sisu_comment,sisu_break,sisu_link,sisu_sub_header_creator matchgroup=sisu_header start="^[@]creator:[+-]\?\(\s\|\n\)"rs=e-1 end="\n$"
" dates
syn region sisu_header_content contains=sisu_error,sisu_comment,sisu_break,sisu_link,sisu_sub_header_date matchgroup=sisu_header start="^[@]date:[+-]\?\(\s\|\n\)"rs=e-1 end="\n$"
" publisher
syn region sisu_header_content contains=sisu_error,sisu_comment,sisu_break,sisu_link,sisu_sub_header_publisher matchgroup=sisu_header start="^[@]publisher:[+-]\?\(\s\|\n\)"rs=e-1 end="\n$"
" rights
syn region sisu_header_content contains=sisu_error,sisu_comment,sisu_break,sisu_link,sisu_sub_header_rights matchgroup=sisu_header start="^[@]rights:[+-]\?\(\s\|\n\)"rs=e-1 end="\n$"
" classify document
syn region sisu_header_content contains=sisu_error,sisu_comment,sisu_break,sisu_link,sisu_sub_header_classify matchgroup=sisu_header start="^[@]classify:[+-]\?\(\s\|\n\)"rs=e-1 end="\n$"
" identifier document
syn region sisu_header_content contains=sisu_error,sisu_comment,sisu_break,sisu_link,sisu_sub_header_identifier matchgroup=sisu_header start="^[@]identifier:[+-]\?\(\s\|\n\)"rs=e-1 end="\n$"
" original language (depreciated)
syn region sisu_header_content contains=sisu_error,sisu_comment,sisu_break,sisu_link,sisu_sub_header_original matchgroup=sisu_header start="^[@]original:[+-]\?\(\s\|\n\)"rs=e-1 end="\n$"
" notes
syn region sisu_header_content contains=sisu_error,sisu_comment,sisu_break,sisu_link,sisu_sub_header_notes matchgroup=sisu_header start="^[@]notes:[+-]\?\(\s\|\n\)"rs=e-1 end="\n$"
" links of interest
syn region sisu_header_content contains=sisu_error,sisu_comment,sisu_break,sisu_linked,sisu_sub_header_links matchgroup=sisu_header start="^[@]links:[+-]\?\(\s\|\n\)"rs=e-1 end="\n$"
" make, processing instructions
syn region sisu_header_content contains=sisu_error,sisu_comment,sisu_break,sisu_link,sisu_sub_header_make matchgroup=sisu_header start="^[@]make:[+-]\?\(\s\|\n\)"rs=e-1 end="\n$"

"% "Headings:
syn region sisu_heading contains=sisu_mark_endnote,sisu_content_endnote,sisu_marktail,sisu_strikeout,sisu_number,sisu_bold,sisu_control,sisu_identifier,sisu_ocn,sisu_error,sisu_error_wspace matchgroup=sisu_structure start="^\([1-4]\|:\?[A-D]\)\~\(\S\+\|[^-]\)" end="$"

"% "Block Group Text:
" table
syn region sisu_content_alt contains=sisu_strikeout,sisu_number,sisu_bold,sisu_control,sisu_identifier,sisu_error matchgroup=sisu_contain start="^table{.\+" end="}table"
" table
syn region sisu_content_alt contains=sisu_strikeout,sisu_number,sisu_bold,sisu_control,sisu_identifier,sisu_error matchgroup=sisu_contain start="^```\s\+table" end="^```\(\s\|$\)"
syn region sisu_content_alt contains=sisu_strikeout,sisu_number,sisu_bold,sisu_control,sisu_identifier,sisu_error matchgroup=sisu_contain start="^{\(t\|table\)\(\~h\)\?\(\sc[0-9]\+;\)\?[0-9; ]*}" end="\n$"
" block, group, poem, alt
syn region sisu_content_alt contains=sisu_mark_endnote,sisu_content_endnote,sisu_link,sisu_mark,sisu_strikeout,sisu_number,sisu_control,sisu_identifier,sisu_error matchgroup=sisu_contain start="^\z(block\|group\|poem\|alt\){" end="^}\z1"
syn region sisu_content_alt contains=sisu_mark_endnote,sisu_content_endnote,sisu_link,sisu_mark,sisu_strikeout,sisu_number,sisu_control,sisu_identifier,sisu_error matchgroup=sisu_contain start="^```\s\+\(block\|group\|poem\|alt\)" end="^```\(\s\|$\)"
" box
syn region sisu_content_alt contains=sisu_mark_endnote,sisu_content_endnote,sisu_link,sisu_mark,sisu_strikeout,sisu_number,sisu_control,sisu_identifier,sisu_error matchgroup=sisu_contain start="^box\(\.[a-z]\+\)\?{" end="^}box"
syn region sisu_content_alt contains=sisu_mark_endnote,sisu_content_endnote,sisu_link,sisu_mark,sisu_strikeout,sisu_number,sisu_control,sisu_identifier,sisu_error matchgroup=sisu_contain start="^```\s\+\box\(\.[a-z]\+\)\?" end="^```\(\s\|$\)"
" code
syn region sisu_content_alt contains=sisu_error,@NoSpell matchgroup=sisu_contain start="^code\(\.[a-z][0-9a-z_]\+\)\?{" end="^}code"
syn region sisu_content_alt contains=sisu_error,@NoSpell matchgroup=sisu_contain start="^```\s\+code\(\.[a-z][0-9a-z_]\+\)\?" end="^```\(\s\|$\)"
" quote
syn region sisu_normal contains=sisu_fontface,sisu_bold,sisu_control,sisu_identifier,sisu_content_endnote,sisu_mark_endnote,sisu_link,sisu_sem_block,sisu_sem_content,sisu_sem_marker_block,sisu_sem_marker,sisu_sem_ex_marker_block,sisu_sem_ex_marker,sisu_linked,sisu_error,sisu_error_wspace matchgroup=sisu_contain start="^```\s\+quote" end="^```\(\s\|$\)"

"% "Endnotes:
" regular endnote or asterisk or plus sign endnote
syn region sisu_content_endnote contains=sisu_link,sisu_strikeout,sisu_underline,sisu_number,sisu_bold,sisu_control,sisu_identifier,sisu_error,sisu_error_wspace,sisu_mark,sisu_break,sisu_sem_block,sisu_sem_content,sisu_sem_marker_block,sisu_sem_marker,sisu_sem_ex_marker_block,sisu_sem_ex_marker matchgroup=sisu_mark_endnote start="\~{[*+]*" end="}\~" skip="\n"
" numbered asterisk or plus sign endnote
syn region sisu_content_endnote contains=sisu_link,sisu_strikeout,sisu_underline,sisu_number,sisu_bold,sisu_control,sisu_identifier,sisu_error,sisu_error_wspace,sisu_mark,sisu_break,sisu_sem_block,sisu_sem_content,sisu_sem_marker matchgroup=sisu_mark_endnote start="\~\[[*+]*" end="\]\~" skip="\n"
" endnote content marker (for binary content marking)
syn region sisu_content_endnote contains=sisu_strikeout,sisu_number,sisu_bold,sisu_control,sisu_link,sisu_identifier,sisu_error,sisu_error_wspace,sisu_mark,sisu_break matchgroup=sisu_mark_endnote start="\^\~" end="\n$"

"% "Links And Images:
" image with url link (and possibly footnote of url)
syn region sisu_linked contains=sisu_fontface,sisu_strikeout,sisu_number,sisu_bold,sisu_control,sisu_identifier,sisu_sem_block,sisu_sem_content,sisu_sem_marker_block,sisu_sem_marker,sisu_sem_ex_marker_block,sisu_sem_ex_marker,sisu_sem_block,sisu_error matchgroup=sisu_link start="{\(\~^\s\)\?" end="}\(https\?:/\/\|:\|\.\.\/\|#\)\S\+" oneline
" sisu outputs, short notation
syn region sisu_linked contains=sisu_fontface,sisu_strikeout,sisu_number,sisu_bold,sisu_control,sisu_identifier,sisu_sem_block,sisu_sem_content,sisu_sem_marker_block,sisu_sem_marker,sisu_sem_ex_marker_block,sisu_sem_ex_marker,sisu_sem_block,sisu_error matchgroup=sisu_link start="{\(\~^\s\)\?" end="\[[1-5][sS]*\]}\S\+\.ss[tm]" oneline
" image
syn region sisu_linked contains=sisu_fontface,sisu_strikeout,sisu_number,sisu_bold,sisu_control,sisu_identifier,sisu_error matchgroup=sisu_link start="{" end="}image" oneline

"% "Some Line Operations:
" bold line
syn region sisu_bold contains=sisu_strikeout,sisu_identifier,sisu_content_endnote,sisu_mark_endnote,sisu_error,sisu_error_wspace matchgroup=sisu_markpara start="^!_ " end=" \\\\\|$"
" indent and bullet paragraph
syn region sisu_normal contains=sisu_fontface,sisu_bold,sisu_control,sisu_identifier,sisu_content_endnote,sisu_mark_endnote,sisu_link,sisu_sem_block,sisu_sem_content,sisu_sem_marker_block,sisu_sem_marker,sisu_sem_ex_marker_block,sisu_sem_ex_marker,sisu_linked,sisu_error,sisu_error_wspace matchgroup=sisu_markpara start="^_\([1-9*]\|[1-9]\*\) " end="$"
" indent and bullet (bold start) paragraph
syn region sisu_bold contains=sisu_fontface,sisu_bold,sisu_control,sisu_identifier,sisu_content_endnote,sisu_mark_endnote,sisu_link,sisu_sem_block,sisu_sem_content,sisu_sem_marker_block,sisu_sem_marker,sisu_sem_ex_marker_block,sisu_sem_ex_marker,sisu_linked,sisu_error,sisu_error_wspace matchgroup=sisu_markpara start="^_\([1-9*]\|[1-9]\*\)!_\? " end=" \\\\\|$"
" hanging indent paragraph [proposed]
syn region sisu_normal contains=sisu_fontface,sisu_bold,sisu_control,sisu_identifier,sisu_content_endnote,sisu_mark_endnote,sisu_link,sisu_sem_block,sisu_sem_content,sisu_sem_marker_block,sisu_sem_marker,sisu_sem_ex_marker_block,sisu_sem_ex_marker,sisu_linked,sisu_error,sisu_error_wspace matchgroup=sisu_markpara start="^_[0-9]\?_[0-9] " end="$"
" hanging indent (bold start/ definition) paragraph [proposed]
syn region sisu_bold contains=sisu_fontface,sisu_bold,sisu_control,sisu_identifier,sisu_content_endnote,sisu_mark_endnote,sisu_link,sisu_sem_block,sisu_sem_content,sisu_sem_marker_block,sisu_sem_marker,sisu_sem_ex_marker_block,sisu_sem_ex_marker,sisu_linked,sisu_error,sisu_error_wspace matchgroup=sisu_markpara start="^_[0-9]\?_[0-9]!_\? " end=" \\\\\|$"
" list numbering
syn region sisu_normal contains=sisu_strikeout,sisu_identifier,sisu_content_endnote,sisu_mark_endnote,sisu_link,sisu_linked,sisu_error,sisu_error_wspace matchgroup=sisu_markpara start="^\(#[ 1]\|_# \)" end="$"

"% "Font Face Curly Brackets:
"syn region sisu_identifier contains=sisu_strikeout,sisu_number,sisu_control,sisu_identifier,sisu_error matchgroup=sisu_sem start="\S\+:{" end="}:[^<>,.!?:; ]\+" oneline
" book index:
syn region sisu_index contains=sisu_within_index_ignore,sisu_within_index matchgroup=sisu_index_block start="^={" end="}"
" emphasis:
syn region sisu_bold contains=sisu_strikeout,sisu_number,sisu_bold,sisu_control,sisu_identifier,sisu_error matchgroup=sisu_fontface start="\*{" end="}\*"
" bold:
syn region sisu_bold contains=sisu_strikeout,sisu_number,sisu_bold,sisu_control,sisu_identifier,sisu_error matchgroup=sisu_fontface start="!{" end="}!"
" underscore:
syn region sisu_underline contains=sisu_strikeout,sisu_number,sisu_bold,sisu_control,sisu_identifier,sisu_error matchgroup=sisu_fontface start="_{" end="}_"
" italics:
syn region sisu_identifier contains=sisu_strikeout,sisu_number,sisu_bold,sisu_control,sisu_identifier,sisu_error matchgroup=sisu_fontface start="/{" end="}/"
" added:
syn region sisu_underline contains=sisu_strikeout,sisu_number,sisu_bold,sisu_control,sisu_identifier,sisu_error matchgroup=sisu_fontface start="+{" end="}+"
" superscript:
syn region sisu_identifier contains=sisu_strikeout,sisu_number,sisu_bold,sisu_control,sisu_identifier,sisu_error matchgroup=sisu_fontface start="\^{" end="}\^"
" subscript:
syn region sisu_identifier contains=sisu_strikeout,sisu_number,sisu_bold,sisu_control,sisu_identifier,sisu_error matchgroup=sisu_fontface start=",{" end="},"
" monospace:
syn region sisu_identifier contains=sisu_strikeout,sisu_number,sisu_bold,sisu_control,sisu_identifier,sisu_error matchgroup=sisu_fontface start="#{" end="}#"
" strikethrough:
syn region sisu_strikeout contains=sisu_error matchgroup=sisu_fontface start="-{" end="}-"

"% "Single Words Bold Italicise Etc: (depreciated)
syn region sisu_bold contains=sisu_error matchgroup=sisu_bold start="\([ (]\|^\)\*[^\|{\n\~\\]"hs=e-1 end="\*"he=e-0 skip="[a-zA-Z0-9']" oneline
syn region sisu_identifier contains=sisu_error matchgroup=sisu_content_alt start="\([ ]\|^\)/[^{ \|\n\\]"hs=e-1 end="/\[ \.\]" skip="[a-zA-Z0-9']" oneline
"misc
syn region sisu_identifier contains=sisu_error matchgroup=sisu_fontface start="\^[^ {\|\n\\]"rs=s+1 end="\^[ ,.;:'})\\\n]" skip="[a-zA-Z0-9']" oneline

"% "Expensive Mode:
if !exists("sisu_no_expensive")
else " not Expensive
  syn region  sisu_content_alt  matchgroup=sisu_control start="^\s*def\s" matchgroup=NONE end="[?!]\|\>" skip="\.\|\(::\)" oneline
endif " Expensive?

"% "Headers And Headings: (Document Instructions)
syn match sisu_control contains=sisu_error,sisu_error_wspace "4\~! \S\+"
syn region  sisu_markpara contains=sisu_error,sisu_error_wspace start="^=begin" end="^=end.*$"

"% "Errors:
syn match sisu_error_wspace contains=sisu_error_wspace "^\s\+[^:]"
syn match sisu_error_wspace contains=sisu_error_wspace "\s\s\+"
syn match sisu_error_wspace contains=sisu_error_wspace "\s\+$"
syn match sisu_error contains=sisu_error_wspace "\t\+"
syn match sisu_error contains=sisu_error,sisu_error_wspace "\([^ (][_\\]\||[^ (}]\)https\?:\S\+"
syn match sisu_error contains=sisu_error "_\?https\?:\S\+[}><]"
syn match sisu_error contains=sisu_error "\([!*/_\+,^]\){\([^(\}\1)]\)\{-}\n$"
syn match sisu_error contains=sisu_error "^[\~]{[^{]\{-}\n$"
syn match sisu_error contains=sisu_error "\s\+.{{"
syn match sisu_error contains=sisu_error "^\~\s*$"
syn match sisu_error contains=sisu_error "^0\~.*"
syn match sisu_error contains=sisu_error "^[1-9]\~\s*$"
syn match sisu_error contains=sisu_error "^[1-9]\~\S\+\s*$"
syn match sisu_error contains=sisu_error "[^{]\~\^[^ \)]"
syn match sisu_error contains=sisu_error "\~\^\s\+\.\s*"
syn match sisu_error contains=sisu_error "{\~^\S\+"
syn match sisu_error contains=sisu_error "[_/\*!^]{[ .,:;?><]*}[_/\*!^]"
syn match sisu_error contains=sisu_error "[^ (\"'(\[][_/\*!]{\|}[_/\*!][a-zA-Z0-9)\]\"']"
syn match sisu_error contains=sisu_error "<dir>"
"errors for filetype sisu, though not error in 'metaverse':
syn match sisu_error contains=sisu_error,sisu_match,sisu_strikeout,sisu_contain,sisu_content_alt,sisu_mark,sisu_break,sisu_number "<[a-zA-Z\/]\+>"
syn match sisu_error  "/\?<\([biu]\)>[^(</\1>)]\{-}\n$"

"% "Error Exceptions:
syn match sisu_control "\n$" "contains=ALL
"syn match sisu_control " //"
syn match sisu_error   "%{"
syn match sisu_error   "<br>_\?https\?:\S\+\|_\?https\?:\S\+<br>"
syn match sisu_error   "[><]_\?https\?:\S\+\|_\?https\?:\S\+[><]"
syn match sisu_comment "^%\{1,2\}.\+"

"% "Definitions Default Highlighting:
hi def link sisu_normal                Normal
hi def link sisu_bold                  Statement
hi def link sisu_header                PreProc
hi def link sisu_header_content        Normal
hi def link sisu_sub_header_title      Statement
hi def link sisu_sub_header_creator    Statement
hi def link sisu_sub_header_date       Statement
hi def link sisu_sub_header_publisher  Statement
hi def link sisu_sub_header_rights     Statement
hi def link sisu_sub_header_classify   Statement
hi def link sisu_sub_header_identifier Statement
hi def link sisu_sub_header_original   Statement
hi def link sisu_sub_header_links      Statement
hi def link sisu_sub_header_notes      Statement
hi def link sisu_sub_header_make       Statement
hi def link sisu_heading               Title
hi def link sisu_structure             Operator
hi def link sisu_contain               Include
hi def link sisu_mark_endnote          Delimiter
hi def link sisu_require               NonText
hi def link sisu_link                  NonText
hi def link sisu_linked                String
hi def link sisu_fontface              Delimiter
hi def link sisu_strikeout             DiffDelete
hi def link sisu_content_alt           Special
hi def link sisu_sem_content           SpecialKey
hi def link sisu_sem_block             Special
hi def link sisu_sem_marker            Visual
"hi def link sisu_sem_marker            Structure
hi def link sisu_sem_marker_block      MatchParen
hi def link sisu_sem_ex_marker         FoldColumn
hi def link sisu_sem_ex_marker_block   Folded
hi def link sisu_sem_ex_content        Comment
"hi def link sisu_sem_ex_content        SpecialKey
hi def link sisu_sem_ex_block          Comment
hi def link sisu_index                 SpecialKey
hi def link sisu_index_block           Visual
hi def link sisu_content_endnote       Special
hi def link sisu_control               Delimiter
hi def link sisu_within_index          Delimiter
hi def link sisu_within_index_ignore   SpecialKey
hi def link sisu_ocn                   Include
hi def link sisu_number                Number
hi def link sisu_identifier            Function
hi def link sisu_underline             Underlined
hi def link sisu_markpara              Include
hi def link sisu_marktail              Include
hi def link sisu_mark                  Identifier
hi def link sisu_break                 Structure
hi def link sisu_html                  Type
hi def link sisu_action                Identifier
hi def link sisu_comment               Comment
hi def link sisu_error_sem_marker      Error
hi def link sisu_error_wspace          Error
hi def link sisu_error                 Error
let b:current_syntax = "sisu"
let &cpo = s:cpo_save
unlet s:cpo_save