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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/t4-templating.js +1

@@ -0,0 +1 @@
1 !function(e){function t(e,t,a){return{pattern:RegExp("<#"+e+"[\\s\\S]*?#>"),alias:"block",inside:{delimiter:{pattern:RegExp("^<#"+e+"|#>$"),alias:"important"},content:{pattern:/[\s\S]+/,inside:t,alias:a}}}}e.languages["t4-templating"]=Object.defineProperty({},"createT4",{value:function(a){var n=e.languages[a],i="language-"+a;return{block:{pattern:/<#[\s\S]+?#>/,inside:{directive:t("@",{"attr-value":{pattern:/=(?:("|')(?:\\[\s\S]|(?!\1)[^\\])*\1|[^\s'">=]+)/,inside:{punctuation:/^=|^["']|["']$/}},keyword:/\b\w+(?=\s)/,"attr-name":/\b\w+/}),expression:t("=",n,i),"class-feature":t("\\+",n,i),standard:t("",n,i)}}}}})}(Prism);