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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/parigp.js +1

@@ -0,0 +1 @@
1 Prism.languages.parigp={comment:/\/\*[\s\S]*?\*\/|\\\\.*/,string:{pattern:/"(?:[^"\\\r\n]|\\.)*"/,greedy:!0},keyword:function(){var r=["breakpoint","break","dbg_down","dbg_err","dbg_up","dbg_x","forcomposite","fordiv","forell","forpart","forprime","forstep","forsubgroup","forvec","for","iferr","if","local","my","next","return","until","while"];return r=r.map((function(r){return r.split("").join(" *")})).join("|"),RegExp("\\b(?:"+r+")\\b")}(),function:/\b\w(?:[\w ]*\w)?(?= *\()/,number:{pattern:/((?:\. *\. *)?)(?:\b\d(?: *\d)*(?: *(?!\. *\.)\.(?: *\d)*)?|\. *\d(?: *\d)*)(?: *e *(?:[+-] *)?\d(?: *\d)*)?/i,lookbehind:!0},operator:/\. *\.|[*\/!](?: *=)?|%(?: *=|(?: *#)?(?: *')*)?|\+(?: *[+=])?|-(?: *[-=>])?|<(?: *>|(?: *<)?(?: *=)?)?|>(?: *>)?(?: *=)?|=(?: *=){0,2}|\\(?: *\/)?(?: *=)?|&(?: *&)?|\| *\||['#~^]/,punctuation:/[\[\]{}().,:;|]/};