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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/toml.js +1

@@ -0,0 +1 @@
1 !function(e){function n(e){return e.replace(/__/g,(function(){return"(?:[\\w-]+|'[^'\n\r]*'|\"(?:\\\\.|[^\\\\\"\r\n])*\")"}))}e.languages.toml={comment:{pattern:/#.*/,greedy:!0},table:{pattern:RegExp(n("(^[\t ]*\\[\\s*(?:\\[\\s*)?)__(?:\\s*\\.\\s*__)*(?=\\s*\\])"),"m"),lookbehind:!0,greedy:!0,alias:"class-name"},key:{pattern:RegExp(n("(^[\t ]*|[{,]\\s*)__(?:\\s*\\.\\s*__)*(?=\\s*=)"),"m"),lookbehind:!0,greedy:!0,alias:"property"},string:{pattern:/"""(?:\\[\s\S]|[^\\])*?"""|'''[\s\S]*?'''|'[^'\n\r]*'|"(?:\\.|[^\\"\r\n])*"/,greedy:!0},date:[{pattern:/\b\d{4}-\d{2}-\d{2}(?:[T\s]\d{2}:\d{2}:\d{2}(?:\.\d+)?(?:Z|[+-]\d{2}:\d{2})?)?\b/i,alias:"number"},{pattern:/\b\d{2}:\d{2}:\d{2}(?:\.\d+)?\b/,alias:"number"}],number:/(?:\b0(?:x[\da-zA-Z]+(?:_[\da-zA-Z]+)*|o[0-7]+(?:_[0-7]+)*|b[10]+(?:_[10]+)*))\b|[-+]?\b\d+(?:_\d+)*(?:\.\d+(?:_\d+)*)?(?:[eE][+-]?\d+(?:_\d+)*)?\b|[-+]?\b(?:inf|nan)\b/,boolean:/\b(?:false|true)\b/,punctuation:/[.,=[\]{}]/}}(Prism);