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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/protobuf.js +1

@@ -0,0 +1 @@
1 !function(e){var s=/\b(?:bool|bytes|double|s?fixed(?:32|64)|float|[su]?int(?:32|64)|string)\b/;e.languages.protobuf=e.languages.extend("clike",{"class-name":[{pattern:/(\b(?:enum|extend|message|service)\s+)[A-Za-z_]\w*(?=\s*\{)/,lookbehind:!0},{pattern:/(\b(?:rpc\s+\w+|returns)\s*\(\s*(?:stream\s+)?)\.?[A-Za-z_]\w*(?:\.[A-Za-z_]\w*)*(?=\s*\))/,lookbehind:!0}],keyword:/\b(?:enum|extend|extensions|import|message|oneof|option|optional|package|public|repeated|required|reserved|returns|rpc(?=\s+\w)|service|stream|syntax|to)\b(?!\s*=\s*\d)/,function:/\b[a-z_]\w*(?=\s*\()/i}),e.languages.insertBefore("protobuf","operator",{map:{pattern:/\bmap<\s*[\w.]+\s*,\s*[\w.]+\s*>(?=\s+[a-z_]\w*\s*[=;])/i,alias:"class-name",inside:{punctuation:/[<>.,]/,builtin:s}},builtin:s,"positional-class-name":{pattern:/(?:\b|\B\.)[a-z_]\w*(?:\.[a-z_]\w*)*(?=\s+[a-z_]\w*\s*[=;])/i,alias:"class-name",inside:{punctuation:/\./}},annotation:{pattern:/(\[\s*)[a-z_]\w*(?=\s*=)/i,lookbehind:!0}})}(Prism);