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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/mata.js +1

@@ -0,0 +1 @@
1 !function(t){var e="\\bvoid\\b|<org>|\\b(?:complex|numeric|pointer(?:\\s*\\([^()]*\\))?|real|string|(?:class|struct)\\s+\\w+|transmorphic)(?:\\s*<org>)?".replace(/<org>/g,"\\b(?:(?:col|row)?vector|matrix|scalar)\\b");t.languages.mata={comment:{pattern:/\/\/.*|\/\*(?:[^*/]|\*(?!\/)|\/(?!\*)|\/\*(?:[^*]|\*(?!\/))*\*\/)*\*\//,greedy:!0},string:{pattern:/"[^"\r\n]*"|[‘`']".*?"[’`']/,greedy:!0},"class-name":{pattern:/(\b(?:class|extends|struct)\s+)\w+(?=\s*(?:\{|\bextends\b))/,lookbehind:!0},type:{pattern:RegExp(e),alias:"class-name",inside:{punctuation:/[()]/,keyword:/\b(?:class|function|struct|void)\b/}},keyword:/\b(?:break|class|continue|do|else|end|extends|external|final|for|function|goto|if|pragma|private|protected|public|return|static|struct|unset|unused|version|virtual|while)\b/,constant:/\bNULL\b/,number:{pattern:/(^|[^\w.])(?:\d+(?:\.\d+)?(?:e[+-]?\d+)?|\d[a-f0-9]*(?:\.[a-f0-9]+)?x[+-]?\d+)i?(?![\w.])/i,lookbehind:!0},missing:{pattern:/(^|[^\w.])(?:\.[a-z]?)(?![\w.])/,lookbehind:!0,alias:"symbol"},function:/\b[a-z_]\w*(?=\s*\()/i,operator:/\.\.|\+\+|--|&&|\|\||:?(?:[!=<>]=|[+\-*/^<>&|:])|[!?=\\#’`']/,punctuation:/[()[\]{},;.]/}}(Prism);