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Load a Prism grammar only when a blob names it

1b8675b19e70346d6d02d5fc0c10538f50bf94b2 · Keenan Nemetz · 9d ago · parent 11720250

Load a Prism grammar only when a blob names it

The worker imported prism-languages.min.js — every grammar Prism ships — on
every code page. That is 546 KB to evaluate before the first token, and a page
showing one Go file paid it for all 293 components.

Each component is now vendored as its own file, and prism-manifest.js maps a
language name to the files that define it in dependency order. The worker
starts with Prism's core and the manifest and imports a language's files the
first time a job names it, remembering what it has run so a file is never
imported twice. A Go blob loads 30 KB instead of 564 KB; a .tsx blob, the
widest common entry at 8 files, loads 49 KB.

The manifest also carries the components that register no language of their
own but change one: css-extras, js-extras, js-templates, php-extras, xml-doc.
Each is placed after the grammar it rewrites and included in the entries that
inherit it, so a language that extends javascript now gets js-extras' arrow
and maybe-class-name tokens too. The old bundle's order handed those to some
inheriting languages and not others; nothing loses a token.

scripts/vendor-prism.py writes the grammars and the manifest, and --check
compares them byte for byte with cdnjs. TestPrismLanguagesAreVendored,
TestPrismGrammarsMatchTheManifest and TestPrismWorkerLoadsGrammarsOnDemand
hold the server's extension table, the vendored set and the worker's lazy
import together.

server/web/static/prism-languages/autoit.js +1

@@ -0,0 +1 @@
		1	Prism.languages.autoit={comment:[/;./,{pattern:/(^[\t ])#(?:comments-start\|cs)[\s\S]?^[ \t]#(?:ce\|comments-end)/m,lookbehind:!0}],url:{pattern:/(^[\t ]#include\s+)(?:<[^\r\n>]+>\|"[^\r\n"]+")/m,lookbehind:!0},string:{pattern:/(["'])(?:\1\1\|(?!\1)[^\r\n])\1/,greedy:!0,inside:{variable:/([%$@])\w+\1/}},directive:{pattern:/(^[\t ])#[\w-]+/m,lookbehind:!0,alias:"keyword"},function:/\b\w+(?=\()/,variable:/[$@]\w+/,keyword:/\b(?:Case\|Const\|Continue(?:Case\|Loop)\|Default\|Dim\|Do\|Else(?:If)?\|End(?:Func\|If\|Select\|Switch\|With)\|Enum\|Exit(?:Loop)?\|For\|Func\|Global\|If\|In\|Local\|Next\|Null\|ReDim\|Select\|Static\|Step\|Switch\|Then\|To\|Until\|Volatile\|WEnd\|While\|With)\b/i,number:/\b(?:0x[\da-f]+\|\d+(?:\.\d+)?(?:e[+-]?\d+)?)\b/i,boolean:/\b(?:False\|True)\b/i,operator:/<[=>]?\|[-+\/=&>]=?\|[?^]\|\b(?:And\|Not\|Or)\b/i,punctuation:/[\[\]().,:]/};