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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/openqasm.js +1

@@ -0,0 +1 @@
		1	Prism.languages.openqasm={comment:/\/\[\s\S]?\\/\|\/\/./,string:{pattern:/"[^"\r\n\t]"\|'[^'\r\n\t]'/,greedy:!0},keyword:/\b(?:CX\|OPENQASM\|U\|barrier\|boxas\|boxto\|break\|const\|continue\|ctrl\|def\|defcal\|defcalgrammar\|delay\|else\|end\|for\|gate\|gphase\|if\|in\|include\|inv\|kernel\|lengthof\|let\|measure\|pow\|reset\|return\|rotary\|stretchinf\|while)\b\|#pragma\b/,"class-name":/\b(?:angle\|bit\|bool\|creg\|fixed\|float\|int\|length\|qreg\|qubit\|stretch\|uint)\b/,function:/\b(?:cos\|exp\|ln\|popcount\|rotl\|rotr\|sin\|sqrt\|tan)\b(?=\s\()/,constant:/\b(?:euler\|pi\|tau)\b\|π\|𝜏\|ℇ/,number:{pattern:/(^\|[^.\w$])(?:\d+(?:\.\d)?\|\.\d+)(?:e[+-]?\d+)?(?:dt\|ns\|us\|µs\|ms\|s)?/i,lookbehind:!0},operator:/->\|>>=?\|<<=?\|&&\|\\|\\|\|\+\+\|--\|[!=<>&\|~^+\-*/%]=?\|@/,punctuation:/[(){}\[\];,:.]/},Prism.languages.qasm=Prism.languages.openqasm;