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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/latte.js +1

@@ -0,0 +1 @@
1 !function(a){a.languages.latte={comment:/^\{\*[\s\S]*/,"latte-tag":{pattern:/(^\{(?:\/(?=[a-z]))?)(?:[=_]|[a-z]\w*\b(?!\())/i,lookbehind:!0,alias:"important"},delimiter:{pattern:/^\{\/?|\}$/,alias:"punctuation"},php:{pattern:/\S(?:[\s\S]*\S)?/,alias:"language-php",inside:a.languages.php}};var t=a.languages.extend("markup",{});a.languages.insertBefore("inside","attr-value",{"n-attr":{pattern:/n:[\w-]+(?:\s*=\s*(?:"[^"]*"|'[^']*'|[^\s'">=]+))?/,inside:{"attr-name":{pattern:/^[^\s=]+/,alias:"important"},"attr-value":{pattern:/=[\s\S]+/,inside:{punctuation:[/^=/,{pattern:/^(\s*)["']|["']$/,lookbehind:!0}],php:{pattern:/\S(?:[\s\S]*\S)?/,inside:a.languages.php}}}}}},t.tag),a.hooks.add("before-tokenize",(function(e){"latte"===e.language&&(a.languages["markup-templating"].buildPlaceholders(e,"latte",/\{\*[\s\S]*?\*\}|\{[^'"\s{}*](?:[^"'/{}]|\/(?![*/])|("|')(?:\\[\s\S]|(?!\1)[^\\])*\1|\/\*(?:[^*]|\*(?!\/))*\*\/)*\}/g),e.grammar=t)})),a.hooks.add("after-tokenize",(function(t){a.languages["markup-templating"].tokenizePlaceholders(t,"latte")}))}(Prism);