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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/crystal.js +1

@@ -0,0 +1 @@
1 !function(e){e.languages.crystal=e.languages.extend("ruby",{keyword:[/\b(?:__DIR__|__END_LINE__|__FILE__|__LINE__|abstract|alias|annotation|as|asm|begin|break|case|class|def|do|else|elsif|end|ensure|enum|extend|for|fun|if|ifdef|include|instance_sizeof|lib|macro|module|next|of|out|pointerof|private|protected|ptr|require|rescue|return|select|self|sizeof|struct|super|then|type|typeof|undef|uninitialized|union|unless|until|when|while|with|yield)\b/,{pattern:/(\.\s*)(?:is_a|responds_to)\?/,lookbehind:!0}],number:/\b(?:0b[01_]*[01]|0o[0-7_]*[0-7]|0x[\da-fA-F_]*[\da-fA-F]|(?:\d(?:[\d_]*\d)?)(?:\.[\d_]*\d)?(?:[eE][+-]?[\d_]*\d)?)(?:_(?:[uif](?:8|16|32|64))?)?\b/,operator:[/->/,e.languages.ruby.operator],punctuation:/[(){}[\].,;\\]/}),e.languages.insertBefore("crystal","string-literal",{attribute:{pattern:/@\[.*?\]/,inside:{delimiter:{pattern:/^@\[|\]$/,alias:"punctuation"},attribute:{pattern:/^(\s*)\w+/,lookbehind:!0,alias:"class-name"},args:{pattern:/\S(?:[\s\S]*\S)?/,inside:e.languages.crystal}}},expansion:{pattern:/\{(?:\{.*?\}|%.*?%)\}/,inside:{content:{pattern:/^(\{.)[\s\S]+(?=.\}$)/,lookbehind:!0,inside:e.languages.crystal},delimiter:{pattern:/^\{[\{%]|[\}%]\}$/,alias:"operator"}}},char:{pattern:/'(?:[^\\\r\n]{1,2}|\\(?:.|u(?:[A-Fa-f0-9]{1,4}|\{[A-Fa-f0-9]{1,6}\})))'/,greedy:!0}})}(Prism);