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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/uri.js +1

@@ -0,0 +1 @@
1 Prism.languages.uri={scheme:{pattern:/^[a-z][a-z0-9+.-]*:/im,greedy:!0,inside:{"scheme-delimiter":/:$/}},fragment:{pattern:/#[\w\-.~!$&'()*+,;=%:@/?]*/,inside:{"fragment-delimiter":/^#/}},query:{pattern:/\?[\w\-.~!$&'()*+,;=%:@/?]*/,inside:{"query-delimiter":{pattern:/^\?/,greedy:!0},"pair-delimiter":/[&;]/,pair:{pattern:/^[^=][\s\S]*/,inside:{key:/^[^=]+/,value:{pattern:/(^=)[\s\S]+/,lookbehind:!0}}}}},authority:{pattern:RegExp("^//(?:[\\w\\-.~!$&'()*+,;=%:]*@)?(?:\\[(?:[0-9a-fA-F:.]{2,48}|v[0-9a-fA-F]+\\.[\\w\\-.~!$&'()*+,;=]+)\\]|[\\w\\-.~!$&'()*+,;=%]*)(?::\\d*)?","m"),inside:{"authority-delimiter":/^\/\//,"user-info-segment":{pattern:/^[\w\-.~!$&'()*+,;=%:]*@/,inside:{"user-info-delimiter":/@$/,"user-info":/^[\w\-.~!$&'()*+,;=%:]+/}},"port-segment":{pattern:/:\d*$/,inside:{"port-delimiter":/^:/,port:/^\d+/}},host:{pattern:/[\s\S]+/,inside:{"ip-literal":{pattern:/^\[[\s\S]+\]$/,inside:{"ip-literal-delimiter":/^\[|\]$/,"ipv-future":/^v[\s\S]+/,"ipv6-address":/^[\s\S]+/}},"ipv4-address":/^(?:(?:[03-9]\d?|[12]\d{0,2})\.){3}(?:[03-9]\d?|[12]\d{0,2})$/}}}},path:{pattern:/^[\w\-.~!$&'()*+,;=%:@/]+/m,inside:{"path-separator":/\//}}},Prism.languages.url=Prism.languages.uri;