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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/qsharp.js +1

@@ -0,0 +1 @@
1 !function(e){function n(e,n){return e.replace(/<<(\d+)>>/g,(function(e,r){return"(?:"+n[+r]+")"}))}function r(e,r,a){return RegExp(n(e,r),a||"")}var a=RegExp("\\b(?:"+"Adj BigInt Bool Ctl Double false Int One Pauli PauliI PauliX PauliY PauliZ Qubit Range Result String true Unit Zero Adjoint adjoint apply as auto body borrow borrowing Controlled controlled distribute elif else fail fixup for function if in internal intrinsic invert is let mutable namespace new newtype open operation repeat return self set until use using while within".trim().replace(/ /g,"|")+")\\b"),t=n("<<0>>(?:\\s*\\.\\s*<<0>>)*",["\\b[A-Za-z_]\\w*\\b"]),i={keyword:a,punctuation:/[<>()?,.:[\]]/},s='"(?:\\\\.|[^\\\\"])*"';e.languages.qsharp=e.languages.extend("clike",{comment:/\/\/.*/,string:[{pattern:r("(^|[^$\\\\])<<0>>",[s]),lookbehind:!0,greedy:!0}],"class-name":[{pattern:r("(\\b(?:as|open)\\s+)<<0>>(?=\\s*(?:;|as\\b))",[t]),lookbehind:!0,inside:i},{pattern:r("(\\bnamespace\\s+)<<0>>(?=\\s*\\{)",[t]),lookbehind:!0,inside:i}],keyword:a,number:/(?:\b0(?:x[\da-f]+|b[01]+|o[0-7]+)|(?:\B\.\d+|\b\d+(?:\.\d*)?)(?:e[-+]?\d+)?)l?\b/i,operator:/\band=|\bor=|\band\b|\bnot\b|\bor\b|<[-=]|[-=]>|>>>=?|<<<=?|\^\^\^=?|\|\|\|=?|&&&=?|w\/=?|~~~|[*\/+\-^=!%]=?/,punctuation:/::|[{}[\];(),.:]/}),e.languages.insertBefore("qsharp","number",{range:{pattern:/\.\./,alias:"operator"}});var o=function(e,n){for(var r=0;r<2;r++)e=e.replace(/<<self>>/g,(function(){return"(?:"+e+")"}));return e.replace(/<<self>>/g,"[^\\s\\S]")}(n('\\{(?:[^"{}]|<<0>>|<<self>>)*\\}',[s]));e.languages.insertBefore("qsharp","string",{"interpolation-string":{pattern:r('\\$"(?:\\\\.|<<0>>|[^\\\\"{])*"',[o]),greedy:!0,inside:{interpolation:{pattern:r("((?:^|[^\\\\])(?:\\\\\\\\)*)<<0>>",[o]),lookbehind:!0,inside:{punctuation:/^\{|\}$/,expression:{pattern:/[\s\S]+/,alias:"language-qsharp",inside:e.languages.qsharp}}},string:/[\s\S]+/}}})}(Prism),Prism.languages.qs=Prism.languages.qsharp;