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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/llvm.js +1

@@ -0,0 +1 @@
1 !function(a){a.languages.llvm={comment:/;.*/,string:{pattern:/"[^"]*"/,greedy:!0},boolean:/\b(?:false|true)\b/,variable:/[%@!#](?:(?!\d)(?:[-$.\w]|\\[a-f\d]{2})+|\d+)/i,label:/(?!\d)(?:[-$.\w]|\\[a-f\d]{2})+:/i,type:{pattern:/\b(?:double|float|fp128|half|i[1-9]\d*|label|metadata|ppc_fp128|token|void|x86_fp80|x86_mmx)\b/,alias:"class-name"},keyword:/\b[a-z_][a-z_0-9]*\b/,number:/[+-]?\b\d+(?:\.\d+)?(?:[eE][+-]?\d+)?\b|\b0x[\dA-Fa-f]+\b|\b0xK[\dA-Fa-f]{20}\b|\b0x[ML][\dA-Fa-f]{32}\b|\b0xH[\dA-Fa-f]{4}\b/,punctuation:/[{}[\];(),.!*=<>]/}}(Prism);