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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/lilypond.js +1

@@ -0,0 +1 @@
		1	!function(e){for(var n='\$(?:[^();"#\\\\]\|\\\\[^]\|;.(?!.)\|"(?:[^"\\\\]\|\\\\.)"\|#(?:\\{(?:(?!#\\})[^])#\\}\|[^{])\|<expr>)\$',i=0;i<5;i++)n=n.replace(/<expr>/g,(function(){return n}));n=n.replace(/<expr>/g,"[^\\s\\S]");var d=e.languages.lilypond={comment:/%(?:(?!\{).\|\{[\s\S]?%\})/,"embedded-scheme":{pattern:RegExp('(^\|[=\\s])#(?:"(?:[^"\\\\]\|\\\\.)"\|[^\\s()"](?:[^\\s()]\|<expr>))'.replace(/<expr>/g,(function(){return n})),"m"),lookbehind:!0,greedy:!0,inside:{scheme:{pattern:/^(#)[\s\S]+$/,lookbehind:!0,alias:"language-scheme",inside:{"embedded-lilypond":{pattern:/#\{[\s\S]?#\}/,greedy:!0,inside:{punctuation:/^#\{\|#\}$/,lilypond:{pattern:/[\s\S]+/,alias:"language-lilypond",inside:null}}},rest:e.languages.scheme}},punctuation:/#/}},string:{pattern:/"(?:[^"\\]\|\\.)"/,greedy:!0},"class-name":{pattern:/(\\new\s+)[\w-]+/,lookbehind:!0},keyword:{pattern:/\\[a-z][-\w]*/i,inside:{punctuation:/^\\/}},operator:/[=\|]\|<<\|>>/,punctuation:{pattern:/(^\|[a-z\d])(?:'+\|,+\|[_^]?-[_^]?(?:[-+^!>._]\|(?=\d))\|[_^]\.?\|[.!])\|[{}()[\]<>^~]\|\\[()[\]<>\\!]\|--\|__/,lookbehind:!0},number:/\b\d+(?:\/\d+)?\b/};d["embedded-scheme"].inside.scheme.inside["embedded-lilypond"].inside.lilypond.inside=d,e.languages.ly=d}(Prism);

@@ -0,0 +1 @@
		1	!function(e){for(var n='\\((?:[^();"#\\\\]\|\\\\[^]\|;.(?!.)\|"(?:[^"\\\\]\|\\\\.)"\|#(?:\\{(?:(?!#\\})[^])#\\}\|[^{])\|<expr>)\\)',i=0;i<5;i++)n=n.replace(/<expr>/g,(function(){return n}));n=n.replace(/<expr>/g,"[^\\s\\S]");var d=e.languages.lilypond={comment:/%(?:(?!\{).\|\{[\s\S]?%\})/,"embedded-scheme":{pattern:RegExp('(^\|[=\\s])#(?:"(?:[^"\\\\]\|\\\\.)"\|[^\\s()"](?:[^\\s()]\|<expr>))'.replace(/<expr>/g,(function(){return n})),"m"),lookbehind:!0,greedy:!0,inside:{scheme:{pattern:/^(#)[\s\S]+$/,lookbehind:!0,alias:"language-scheme",inside:{"embedded-lilypond":{pattern:/#\{[\s\S]?#\}/,greedy:!0,inside:{punctuation:/^#\{\|#\}$/,lilypond:{pattern:/[\s\S]+/,alias:"language-lilypond",inside:null}}},rest:e.languages.scheme}},punctuation:/#/}},string:{pattern:/"(?:[^"\\]\|\\.)"/,greedy:!0},"class-name":{pattern:/(\\new\s+)[\w-]+/,lookbehind:!0},keyword:{pattern:/\\[a-z][-\w]*/i,inside:{punctuation:/^\\/}},operator:/[=\|]\|<<\|>>/,punctuation:{pattern:/(^\|[a-z\d])(?:'+\|,+\|[_^]?-[_^]?(?:[-+^!>._]\|(?=\d))\|[_^]\.?\|[.!])\|[{}()[\]<>^~]\|\\[()[\]<>\\!]\|--\|__/,lookbehind:!0},number:/\b\d+(?:\/\d+)?\b/};d["embedded-scheme"].inside.scheme.inside["embedded-lilypond"].inside.lilypond.inside=d,e.languages.ly=d}(Prism);