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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/csp.js +1

@@ -0,0 +1 @@
1 !function(e){function n(e){return RegExp("([ \t])(?:"+e+")(?=[\\s;]|$)","i")}e.languages.csp={directive:{pattern:/(^|[\s;])(?:base-uri|block-all-mixed-content|(?:child|connect|default|font|frame|img|manifest|media|object|prefetch|script|style|worker)-src|disown-opener|form-action|frame-(?:ancestors|options)|input-protection(?:-(?:clip|selectors))?|navigate-to|plugin-types|policy-uri|referrer|reflected-xss|report-(?:to|uri)|require-sri-for|sandbox|(?:script|style)-src-(?:attr|elem)|upgrade-insecure-requests)(?=[\s;]|$)/i,lookbehind:!0,alias:"property"},scheme:{pattern:n("[a-z][a-z0-9.+-]*:"),lookbehind:!0},none:{pattern:n("'none'"),lookbehind:!0,alias:"keyword"},nonce:{pattern:n("'nonce-[-+/\\w=]+'"),lookbehind:!0,alias:"number"},hash:{pattern:n("'sha(?:256|384|512)-[-+/\\w=]+'"),lookbehind:!0,alias:"number"},host:{pattern:n("[a-z][a-z0-9.+-]*://[^\\s;,']*|\\*[^\\s;,']*|[a-z0-9-]+(?:\\.[a-z0-9-]+)+(?::[\\d*]+)?(?:/[^\\s;,']*)?"),lookbehind:!0,alias:"url",inside:{important:/\*/}},keyword:[{pattern:n("'unsafe-[a-z-]+'"),lookbehind:!0,alias:"unsafe"},{pattern:n("'[a-z-]+'"),lookbehind:!0,alias:"safe"}],punctuation:/;/}}(Prism);