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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/velocity.js +1

@@ -0,0 +1 @@
1 !function(e){e.languages.velocity=e.languages.extend("markup",{});var n={variable:{pattern:/(^|[^\\](?:\\\\)*)\$!?(?:[a-z][\w-]*(?:\([^)]*\))?(?:\.[a-z][\w-]*(?:\([^)]*\))?|\[[^\]]+\])*|\{[^}]+\})/i,lookbehind:!0,inside:{}},string:{pattern:/"[^"]*"|'[^']*'/,greedy:!0},number:/\b\d+\b/,boolean:/\b(?:false|true)\b/,operator:/[=!<>]=?|[+*/%-]|&&|\|\||\.\.|\b(?:eq|g[et]|l[et]|n(?:e|ot))\b/,punctuation:/[(){}[\]:,.]/};n.variable.inside={string:n.string,function:{pattern:/([^\w-])[a-z][\w-]*(?=\()/,lookbehind:!0},number:n.number,boolean:n.boolean,punctuation:n.punctuation},e.languages.insertBefore("velocity","comment",{unparsed:{pattern:/(^|[^\\])#\[\[[\s\S]*?\]\]#/,lookbehind:!0,greedy:!0,inside:{punctuation:/^#\[\[|\]\]#$/}},"velocity-comment":[{pattern:/(^|[^\\])#\*[\s\S]*?\*#/,lookbehind:!0,greedy:!0,alias:"comment"},{pattern:/(^|[^\\])##.*/,lookbehind:!0,greedy:!0,alias:"comment"}],directive:{pattern:/(^|[^\\](?:\\\\)*)#@?(?:[a-z][\w-]*|\{[a-z][\w-]*\})(?:\s*\((?:[^()]|\([^()]*\))*\))?/i,lookbehind:!0,inside:{keyword:{pattern:/^#@?(?:[a-z][\w-]*|\{[a-z][\w-]*\})|\bin\b/,inside:{punctuation:/[{}]/}},rest:n}},variable:n.variable}),e.languages.velocity.tag.inside["attr-value"].inside.rest=e.languages.velocity}(Prism);