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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/bsl.js +1

@@ -0,0 +1 @@
1 Prism.languages.bsl={comment:/\/\/.*/,string:[{pattern:/"(?:[^"]|"")*"(?!")/,greedy:!0},{pattern:/'(?:[^'\r\n\\]|\\.)*'/}],keyword:[{pattern:/(^|[^\w\u0400-\u0484\u0487-\u052f\u1d2b\u1d78\u2de0-\u2dff\ua640-\ua69f\ufe2e\ufe2f])(?:пока|для|новый|прервать|попытка|исключение|вызватьисключение|иначе|конецпопытки|неопределено|функция|перем|возврат|конецфункции|если|иначеесли|процедура|конецпроцедуры|тогда|знач|экспорт|конецесли|из|каждого|истина|ложь|по|цикл|конеццикла|выполнить)(?![\w\u0400-\u0484\u0487-\u052f\u1d2b\u1d78\u2de0-\u2dff\ua640-\ua69f\ufe2e\ufe2f])/i,lookbehind:!0},{pattern:/\b(?:break|do|each|else|elseif|enddo|endfunction|endif|endprocedure|endtry|except|execute|export|false|for|function|if|in|new|null|procedure|raise|return|then|to|true|try|undefined|val|var|while)\b/i}],number:{pattern:/(^(?=\d)|[^\w\u0400-\u0484\u0487-\u052f\u1d2b\u1d78\u2de0-\u2dff\ua640-\ua69f\ufe2e\ufe2f])(?:\d+(?:\.\d*)?|\.\d+)(?:E[+-]?\d+)?/i,lookbehind:!0},operator:[/[<>+\-*/]=?|[%=]/,{pattern:/(^|[^\w\u0400-\u0484\u0487-\u052f\u1d2b\u1d78\u2de0-\u2dff\ua640-\ua69f\ufe2e\ufe2f])(?:и|или|не)(?![\w\u0400-\u0484\u0487-\u052f\u1d2b\u1d78\u2de0-\u2dff\ua640-\ua69f\ufe2e\ufe2f])/i,lookbehind:!0},{pattern:/\b(?:and|not|or)\b/i}],punctuation:/\(\.|\.\)|[()\[\]:;,.]/,directive:[{pattern:/^([ \t]*)&.*/m,lookbehind:!0,greedy:!0,alias:"important"},{pattern:/^([ \t]*)#.*/gm,lookbehind:!0,greedy:!0,alias:"important"}]},Prism.languages.oscript=Prism.languages.bsl;