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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/bqn.js +1

@@ -0,0 +1 @@
1 Prism.languages.bqn={shebang:{pattern:/^#![ \t]*\/.*/,alias:"important",greedy:!0},comment:{pattern:/#.*/,greedy:!0},"string-literal":{pattern:/"(?:[^"]|"")*"/,greedy:!0,alias:"string"},"character-literal":{pattern:/'(?:[\s\S]|[\uD800-\uDBFF][\uDC00-\uDFFF])'/,greedy:!0,alias:"char"},function:/•[\w¯.∞π]+[\w¯.∞π]*/,"dot-notation-on-brackets":{pattern:/\{(?=.*\}\.)|\}\./,alias:"namespace"},"special-name":{pattern:/(?:𝕨|𝕩|𝕗|𝕘|𝕤|𝕣|𝕎|𝕏|𝔽|𝔾|𝕊|_𝕣_|_𝕣)/,alias:"keyword"},"dot-notation-on-name":{pattern:/[A-Za-z_][\w¯∞π]*\./,alias:"namespace"},"word-number-scientific":{pattern:/\d+(?:\.\d+)?[eE]¯?\d+/,alias:"number"},"word-name":{pattern:/[A-Za-z_][\w¯∞π]*/,alias:"symbol"},"word-number":{pattern:/[¯∞π]?(?:\d*\.?\b\d+(?:e[+¯]?\d+|E[+¯]?\d+)?|¯|∞|π)(?:j¯?(?:(?:\d+(?:\.\d+)?|\.\d+)(?:e[+¯]?\d+|E[+¯]?\d+)?|¯|∞|π))?/,alias:"number"},"null-literal":{pattern:/@/,alias:"char"},"primitive-functions":{pattern:/[-+×÷⋆√⌊⌈|¬∧∨<>≠=≤≥≡≢⊣⊢⥊∾≍⋈↑↓↕«»⌽⍉/⍋⍒⊏⊑⊐⊒∊⍷⊔!]/,alias:"operator"},"primitive-1-operators":{pattern:/[`˜˘¨⁼⌜´˝˙]/,alias:"operator"},"primitive-2-operators":{pattern:/[∘⊸⟜○⌾⎉⚇⍟⊘◶⎊]/,alias:"operator"},punctuation:/[←⇐↩(){}⟨⟩[\]‿·⋄,.;:?]/};