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vim-patch:964a495: runtime(html): match plain tag and attribute names as keywords (#41522)

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Problem:  Several tag and attribute names are highlighted with regular
          expression alternations even though they are plain words.  A
          :syn-match with an alternation is retried at nearly every
          position of every tag.
Solution: Move the plain-word tag names (b, i, u, em, strong, head,
          body, title, h1-h6) and the "label", "href" and "title"
          attribute names into syn-keyword lists, leaving only the
          genuinely hyphenated names "accept-charset" and "http-equiv"
          as matches.

Profiling a 6000-line HTML file with :syntime, the converted rules drop
from a combined 0.044s to 0.004s, lowering total per-rule syntax time
by about 15%.  Highlighting is unchanged except that a bare valueless
"href" attribute is now highlighted as an attribute, consistent with a
bare "title", which already behaved that way.

closes: vim/vim#21155

964a495bef

Co-authored-by: Julien Voisin <julien.voisin@dustri.org>
This commit is contained in:
zeertzjq
2026-08-28 10:09:15 +08:00
committed by GitHub
parent 7e2e3f8c25
commit 2fbc82820b
1 changed files with 8 additions and 9 deletions
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17
runtime/syntax/html.vim
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@@ -6,6 +6,7 @@
" Last Change: 2023 Nov 28
" 2024 Jul 30 by Vim Project: increase syn-sync-minlines to 250
" 2025 May 10 by Vim Project: update comment
" 2026 Aug 26 by Vim Project: match plain tag/attribute names as keywords
" See :help html.vim for some comments and a description of the options
@@ -49,7 +50,7 @@ syn keyword htmlTagName contained input isindex kbd li link map menu
syn keyword htmlTagName contained meta ol option param pre p samp span
syn keyword htmlTagName contained select small strike sub sup
syn keyword htmlTagName contained table td textarea th tr tt ul var xmp
syn match htmlTagName contained "\<\%(b\|i\|u\|h[1-6]\|em\|strong\|head\|body\|title\)\>"
syn keyword htmlTagName contained b i u em strong head body title h1 h2 h3 h4 h5 h6
" new html 4.0 tags
syn keyword htmlTagName contained abbr acronym bdo button col colgroup
@@ -80,15 +81,13 @@ syn keyword htmlArg contained align alink alt archive background bgcolor
syn keyword htmlArg contained border bordercolor cellpadding
syn keyword htmlArg contained cellspacing checked class clear code codebase color
syn keyword htmlArg contained cols colspan content coords enctype face
syn keyword htmlArg contained gutter height hspace id
syn keyword htmlArg contained gutter height href hspace id
syn keyword htmlArg contained link lowsrc marginheight
syn keyword htmlArg contained marginwidth maxlength method name prompt
syn keyword htmlArg contained rel rev rows rowspan scrolling selected shape
syn keyword htmlArg contained size src start target text type url
syn keyword htmlArg contained rel rev role rows rowspan scrolling selected shape
syn keyword htmlArg contained size src start target text title type url
syn keyword htmlArg contained usemap ismap valign value vlink vspace width wrap
syn match htmlArg contained "\<\%(http-equiv\|href\|title\)="me=e-1
syn keyword htmlArg contained role
syn match htmlArg contained "\<http-equiv="me=e-1
" ARIA attributes {{{1
let s:aria =<< trim END
@@ -165,11 +164,11 @@ syn match htmlArg contained "\<z-index\>"
syn keyword htmlTagName contained marquee
" html 4.0 arg names
syn match htmlArg contained "\<\%(accept-charset\|label\)\>"
syn match htmlArg contained "\<accept-charset\>"
syn keyword htmlArg contained abbr accept accesskey axis char charoff charset
syn keyword htmlArg contained cite classid codetype compact data datetime
syn keyword htmlArg contained declare defer dir disabled for frame
syn keyword htmlArg contained headers hreflang lang language longdesc
syn keyword htmlArg contained headers hreflang label lang language longdesc
syn keyword htmlArg contained multiple nohref nowrap object profile readonly
syn keyword htmlArg contained rules scheme scope span standby style
syn keyword htmlArg contained summary tabindex valuetype version