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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/wren.js +1

@@ -0,0 +1 @@
1 Prism.languages.wren={comment:[{pattern:/\/\*(?:[^*/]|\*(?!\/)|\/(?!\*)|\/\*(?:[^*/]|\*(?!\/)|\/(?!\*)|\/\*(?:[^*/]|\*(?!\/)|\/(?!\*))*\*\/)*\*\/)*\*\//,greedy:!0},{pattern:/(^|[^\\:])\/\/.*/,lookbehind:!0,greedy:!0}],"triple-quoted-string":{pattern:/"""[\s\S]*?"""/,greedy:!0,alias:"string"},"string-literal":null,hashbang:{pattern:/^#!\/.+/,greedy:!0,alias:"comment"},attribute:{pattern:/#!?[ \t\u3000]*\w+/,alias:"keyword"},"class-name":[{pattern:/(\bclass\s+)\w+/,lookbehind:!0},/\b[A-Z][a-z\d_]*\b/],constant:/\b[A-Z][A-Z\d_]*\b/,null:{pattern:/\bnull\b/,alias:"keyword"},keyword:/\b(?:as|break|class|construct|continue|else|for|foreign|if|import|in|is|return|static|super|this|var|while)\b/,boolean:/\b(?:false|true)\b/,number:/\b(?:0x[\da-f]+|\d+(?:\.\d+)?(?:e[+-]?\d+)?)\b/i,function:/\b[a-z_]\w*(?=\s*[({])/i,operator:/<<|>>|[=!<>]=?|&&|\|\||[-+*/%~^&|?:]|\.{2,3}/,punctuation:/[\[\](){}.,;]/},Prism.languages.wren["string-literal"]={pattern:/(^|[^\\"])"(?:[^\\"%]|\\[\s\S]|%(?!\()|%\((?:[^()]|\((?:[^()]|\([^)]*\))*\))*\))*"/,lookbehind:!0,greedy:!0,inside:{interpolation:{pattern:/((?:^|[^\\])(?:\\{2})*)%\((?:[^()]|\((?:[^()]|\([^)]*\))*\))*\)/,lookbehind:!0,inside:{expression:{pattern:/^(%\()[\s\S]+(?=\)$)/,lookbehind:!0,inside:Prism.languages.wren},"interpolation-punctuation":{pattern:/^%\(|\)$/,alias:"punctuation"}}},string:/[\s\S]+/}};