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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/xojo.js +1

@@ -0,0 +1 @@
1 Prism.languages.xojo={comment:{pattern:/(?:'|\/\/|Rem\b).+/i,greedy:!0},string:{pattern:/"(?:""|[^"])*"/,greedy:!0},number:[/(?:\b\d+(?:\.\d*)?|\B\.\d+)(?:E[+-]?\d+)?/i,/&[bchou][a-z\d]+/i],directive:{pattern:/#(?:Else|ElseIf|Endif|If|Pragma)\b/i,alias:"property"},keyword:/\b(?:AddHandler|App|Array|As(?:signs)?|Auto|Boolean|Break|By(?:Ref|Val)|Byte|Call|Case|Catch|CFStringRef|CGFloat|Class|Color|Const|Continue|CString|Currency|CurrentMethodName|Declare|Delegate|Dim|Do(?:uble|wnTo)?|Each|Else(?:If)?|End|Enumeration|Event|Exception|Exit|Extends|False|Finally|For|Function|Get|GetTypeInfo|Global|GOTO|If|Implements|In|Inherits|Int(?:8|16|32|64|eger|erface)?|Lib|Loop|Me|Module|Next|Nil|Object|Optional|OSType|ParamArray|Private|Property|Protected|PString|Ptr|Raise(?:Event)?|ReDim|RemoveHandler|Return|Select(?:or)?|Self|Set|Shared|Short|Single|Soft|Static|Step|String|Sub|Super|Text|Then|To|True|Try|Ubound|UInt(?:8|16|32|64|eger)?|Until|Using|Var(?:iant)?|Wend|While|WindowPtr|WString)\b/i,operator:/<[=>]?|>=?|[+\-*\/\\^=]|\b(?:AddressOf|And|Ctype|IsA?|Mod|New|Not|Or|WeakAddressOf|Xor)\b/i,punctuation:/[.,;:()]/};