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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/qore.js +1

@@ -0,0 +1 @@
1 Prism.languages.qore=Prism.languages.extend("clike",{comment:{pattern:/(^|[^\\])(?:\/\*[\s\S]*?\*\/|(?:\/\/|#).*)/,lookbehind:!0},string:{pattern:/("|')(?:\\[\s\S]|(?!\1)[^\\])*\1/,greedy:!0},keyword:/\b(?:abstract|any|assert|binary|bool|boolean|break|byte|case|catch|char|class|code|const|continue|data|default|do|double|else|enum|extends|final|finally|float|for|goto|hash|if|implements|import|inherits|instanceof|int|interface|long|my|native|new|nothing|null|object|our|own|private|reference|rethrow|return|short|soft(?:bool|date|float|int|list|number|string)|static|strictfp|string|sub|super|switch|synchronized|this|throw|throws|transient|try|void|volatile|while)\b/,boolean:/\b(?:false|true)\b/i,function:/\$?\b(?!\d)\w+(?=\()/,number:/\b(?:0b[01]+|0x(?:[\da-f]*\.)?[\da-fp\-]+|(?:\d+(?:\.\d+)?|\.\d+)(?:e\d+)?[df]|(?:\d+(?:\.\d+)?|\.\d+))\b/i,operator:{pattern:/(^|[^.])(?:\+[+=]?|-[-=]?|[!=](?:==?|~)?|>>?=?|<(?:=>?|<=?)?|&[&=]?|\|[|=]?|[*\/%^]=?|[~?])/,lookbehind:!0},variable:/\$(?!\d)\w+\b/});