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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/monkey.js +1

@@ -0,0 +1 @@
1 Prism.languages.monkey={comment:{pattern:/^#Rem\s[\s\S]*?^#End|'.+/im,greedy:!0},string:{pattern:/"[^"\r\n]*"/,greedy:!0},preprocessor:{pattern:/(^[ \t]*)#.+/m,lookbehind:!0,greedy:!0,alias:"property"},function:/\b\w+(?=\()/,"type-char":{pattern:/\b[?%#$]/,alias:"class-name"},number:{pattern:/((?:\.\.)?)(?:(?:\b|\B-\.?|\B\.)\d+(?:(?!\.\.)\.\d*)?|\$[\da-f]+)/i,lookbehind:!0},keyword:/\b(?:Abstract|Array|Bool|Case|Catch|Class|Const|Continue|Default|Eachin|Else|ElseIf|End|EndIf|Exit|Extends|Extern|False|Field|Final|Float|For|Forever|Function|Global|If|Implements|Import|Inline|Int|Interface|Local|Method|Module|New|Next|Null|Object|Private|Property|Public|Repeat|Return|Select|Self|Step|Strict|String|Super|Then|Throw|To|True|Try|Until|Void|Wend|While)\b/i,operator:/\.\.|<[=>]?|>=?|:?=|(?:[+\-*\/&~|]|\b(?:Mod|Shl|Shr)\b)=?|\b(?:And|Not|Or)\b/i,punctuation:/[.,:;()\[\]]/};