1 files changed, 92 insertions, 0 deletions
diff --git a/autoload/vimtex/syntax/misc.vim b/autoload/vimtex/syntax/misc.vim
new file mode 100644
index 00000000..633a1d75
--- /dev/null
+++ b/autoload/vimtex/syntax/misc.vim
@@ -0,0 +1,92 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'latex') == -1
+
+" vimtex - LaTeX plugin for Vim
+"
+" Maintainer: Karl Yngve Lervåg
+" Email:      karl.yngve@gmail.com
+"
+
+function! vimtex#syntax#misc#add_to_section_clusters(group) abort " {{{1
+  for l:cluster in [
+        \ 'texPartGroup',
+        \ 'texChapterGroup',
+        \ 'texSectionGroup',
+        \ 'texSubSectionGroup',
+        \ 'texSubSubSectionGroup',
+        \ 'texParaGroup',
+        \]
+    execute printf('syntax cluster %s add=%s', l:cluster, a:group)
+  endfor
+
+  execute printf('syntax cluster texVimtexGlobal add=%s', a:group)
+endfunction
+
+" }}}1
+function! vimtex#syntax#misc#include(name) abort " {{{1
+  let l:inc_name = 'vimtex_nested_' . a:name
+
+  if !has_key(s:included, l:inc_name)
+    let s:included[l:inc_name] = s:include(l:inc_name, a:name)
+  endif
+
+  return s:included[l:inc_name] ? l:inc_name : ''
+endfunction
+
+" }}}1
+function! vimtex#syntax#misc#include_reset() abort " {{{1
+  let s:included = {'vimtex_nested_tex': 0}
+endfunction
+
+let s:included = {'vimtex_nested_tex': 0}
+
+" }}}1
+function! vimtex#syntax#misc#new_math_zone(sfx, mathzone, starred) abort " {{{1
+  " This function is based on Charles E. Campbell's amsmath.vba file 2018-06-29
+
+  if get(g:, 'tex_fast', 'M') !~# 'M' | return | endif
+
+  let foldcmd = get(g:, 'tex_fold_enabled') ? ' fold' : ''
+
+  let grp = 'texMathZone' . a:sfx
+  execute 'syntax cluster texMathZones add=' . grp
+  execute 'syntax region ' . grp
+        \ . ' start=''\\begin\s*{\s*' . a:mathzone . '\s*}'''
+        \ . ' end=''\\end\s*{\s*' . a:mathzone . '\s*}'''
+        \ . foldcmd . ' keepend contains=@texMathZoneGroup'
+  execute 'highlight def link '.grp.' texMath'
+
+  if a:starred
+    let grp .= 'S'
+    execute 'syntax cluster texMathZones add=' . grp
+    execute 'syntax region ' . grp
+          \ . ' start=''\\begin\s*{\s*' . a:mathzone . '\*\s*}'''
+          \ . ' end=''\\end\s*{\s*' . a:mathzone . '\*\s*}'''
+          \ . foldcmd . ' keepend contains=@texMathZoneGroup'
+    execute 'highlight def link '.grp.' texMath'
+  endif
+
+  execute 'syntax match texBadMath ''\\end\s*{\s*' . a:mathzone . '\*\=\s*}'''
+endfunction
+
+" }}}1
+
+function! s:include(cluster, name) abort " {{{1
+  let l:name = get(g:vimtex_syntax_nested.aliases, a:name, a:name)
+  let l:path = 'syntax/' . l:name . '.vim'
+
+  if empty(globpath(&runtimepath, l:path)) | return 0 | endif
+
+  unlet b:current_syntax
+  execute 'syntax include @' . a:cluster l:path
+  let b:current_syntax = 'tex'
+
+  for l:ignored_group in get(g:vimtex_syntax_nested.ignored, l:name, [])
+    execute 'syntax cluster' a:cluster 'remove=' . l:ignored_group
+  endfor
+
+  return 1
+endfunction
+
+" }}}1
+
+endif