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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/aspnet.js +1

@@ -0,0 +1 @@
1 Prism.languages.aspnet=Prism.languages.extend("markup",{"page-directive":{pattern:/<%\s*@.*%>/,alias:"tag",inside:{"page-directive":{pattern:/<%\s*@\s*(?:Assembly|Control|Implements|Import|Master(?:Type)?|OutputCache|Page|PreviousPageType|Reference|Register)?|%>/i,alias:"tag"},rest:Prism.languages.markup.tag.inside}},directive:{pattern:/<%.*%>/,alias:"tag",inside:{directive:{pattern:/<%\s*?[$=%#:]{0,2}|%>/,alias:"tag"},rest:Prism.languages.csharp}}}),Prism.languages.aspnet.tag.pattern=/<(?!%)\/?[^\s>\/]+(?:\s+[^\s>\/=]+(?:=(?:("|')(?:\\[\s\S]|(?!\1)[^\\])*\1|[^\s'">=]+))?)*\s*\/?>/,Prism.languages.insertBefore("inside","punctuation",{directive:Prism.languages.aspnet.directive},Prism.languages.aspnet.tag.inside["attr-value"]),Prism.languages.insertBefore("aspnet","comment",{"asp-comment":{pattern:/<%--[\s\S]*?--%>/,alias:["asp","comment"]}}),Prism.languages.insertBefore("aspnet",Prism.languages.javascript?"script":"tag",{"asp-script":{pattern:/(<script(?=.*runat=['"]?server\b)[^>]*>)[\s\S]*?(?=<\/script>)/i,lookbehind:!0,alias:["asp","script"],inside:Prism.languages.csharp||{}}});