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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/abnf.js +1

@@ -0,0 +1 @@
1 !function(n){var i="(?:ALPHA|BIT|CHAR|CR|CRLF|CTL|DIGIT|DQUOTE|HEXDIG|HTAB|LF|LWSP|OCTET|SP|VCHAR|WSP)";n.languages.abnf={comment:/;.*/,string:{pattern:/(?:%[is])?"[^"\n\r]*"/,greedy:!0,inside:{punctuation:/^%[is]/}},range:{pattern:/%(?:b[01]+-[01]+|d\d+-\d+|x[A-F\d]+-[A-F\d]+)/i,alias:"number"},terminal:{pattern:/%(?:b[01]+(?:\.[01]+)*|d\d+(?:\.\d+)*|x[A-F\d]+(?:\.[A-F\d]+)*)/i,alias:"number"},repetition:{pattern:/(^|[^\w-])(?:\d*\*\d*|\d+)/,lookbehind:!0,alias:"operator"},definition:{pattern:/(^[ \t]*)(?:[a-z][\w-]*|<[^<>\r\n]*>)(?=\s*=)/m,lookbehind:!0,alias:"keyword",inside:{punctuation:/<|>/}},"core-rule":{pattern:RegExp("(?:(^|[^<\\w-])"+i+"|<"+i+">)(?![\\w-])","i"),lookbehind:!0,alias:["rule","constant"],inside:{punctuation:/<|>/}},rule:{pattern:/(^|[^<\w-])[a-z][\w-]*|<[^<>\r\n]*>/i,lookbehind:!0,inside:{punctuation:/<|>/}},operator:/=\/?|\//,punctuation:/[()\[\]]/}}(Prism);