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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/dhall.js +1

@@ -0,0 +1 @@
1 Prism.languages.dhall={comment:/--.*|\{-(?:[^-{]|-(?!\})|\{(?!-)|\{-(?:[^-{]|-(?!\})|\{(?!-))*-\})*-\}/,string:{pattern:/"(?:[^"\\]|\\.)*"|''(?:[^']|'(?!')|'''|''\$\{)*''(?!'|\$)/,greedy:!0,inside:{interpolation:{pattern:/\$\{[^{}]*\}/,inside:{expression:{pattern:/(^\$\{)[\s\S]+(?=\}$)/,lookbehind:!0,alias:"language-dhall",inside:null},punctuation:/\$\{|\}/}}}},label:{pattern:/`[^`]*`/,greedy:!0},url:{pattern:/\bhttps?:\/\/[\w.:%!$&'*+;=@~-]+(?:\/[\w.:%!$&'*+;=@~-]*)*(?:\?[/?\w.:%!$&'*+;=@~-]*)?/,greedy:!0},env:{pattern:/\benv:(?:(?!\d)\w+|"(?:[^"\\=]|\\.)*")/,greedy:!0,inside:{function:/^env/,operator:/^:/,variable:/[\s\S]+/}},hash:{pattern:/\bsha256:[\da-fA-F]{64}\b/,inside:{function:/sha256/,operator:/:/,number:/[\da-fA-F]{64}/}},keyword:/\b(?:as|assert|else|forall|if|in|let|merge|missing|then|toMap|using|with)\b|\u2200/,builtin:/\b(?:None|Some)\b/,boolean:/\b(?:False|True)\b/,number:/\bNaN\b|-?\bInfinity\b|[+-]?\b(?:0x[\da-fA-F]+|\d+(?:\.\d+)?(?:e[+-]?\d+)?)\b/,operator:/\/\\|\/\/\\\\|&&|\|\||===|[!=]=|\/\/|->|\+\+|::|[+*#@=:?<>|\\\u2227\u2a53\u2261\u2afd\u03bb\u2192]/,punctuation:/\.\.|[{}\[\](),./]/,"class-name":/\b[A-Z]\w*\b/},Prism.languages.dhall.string.inside.interpolation.inside.expression.inside=Prism.languages.dhall;