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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/pascaligo.js +1

@@ -0,0 +1 @@
1 !function(e){var n="(?:\\b\\w+(?:<braces>)?|<braces>)".replace(/<braces>/g,(function(){return"\\((?:[^()]|\\((?:[^()]|\\([^()]*\\))*\\))*\\)"})),t=e.languages.pascaligo={comment:/\(\*[\s\S]+?\*\)|\/\/.*/,string:{pattern:/(["'`])(?:\\[\s\S]|(?!\1)[^\\])*\1|\^[a-z]/i,greedy:!0},"class-name":[{pattern:RegExp("(\\btype\\s+\\w+\\s+is\\s+)<type>".replace(/<type>/g,(function(){return n})),"i"),lookbehind:!0,inside:null},{pattern:RegExp("<type>(?=\\s+is\\b)".replace(/<type>/g,(function(){return n})),"i"),inside:null},{pattern:RegExp("(:\\s*)<type>".replace(/<type>/g,(function(){return n}))),lookbehind:!0,inside:null}],keyword:{pattern:/(^|[^&])\b(?:begin|block|case|const|else|end|fail|for|from|function|if|is|nil|of|remove|return|skip|then|type|var|while|with)\b/i,lookbehind:!0},boolean:{pattern:/(^|[^&])\b(?:False|True)\b/i,lookbehind:!0},builtin:{pattern:/(^|[^&])\b(?:bool|int|list|map|nat|record|string|unit)\b/i,lookbehind:!0},function:/\b\w+(?=\s*\()/,number:[/%[01]+|&[0-7]+|\$[a-f\d]+/i,/\b\d+(?:\.\d+)?(?:e[+-]?\d+)?(?:mtz|n)?/i],operator:/->|=\/=|\.\.|\*\*|:=|<[<=>]?|>[>=]?|[+\-*\/]=?|[@^=|]|\b(?:and|mod|or)\b/,punctuation:/\(\.|\.\)|[()\[\]:;,.{}]/},i=["comment","keyword","builtin","operator","punctuation"].reduce((function(e,n){return e[n]=t[n],e}),{});t["class-name"].forEach((function(e){e.inside=i}))}(Prism);