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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/visual-basic.js +1

@@ -0,0 +1 @@
1 Prism.languages["visual-basic"]={comment:{pattern:/(?:['‘’]|REM\b)(?:[^\r\n_]|_(?:\r\n?|\n)?)*/i,inside:{keyword:/^REM/i}},directive:{pattern:/#(?:Const|Else|ElseIf|End|ExternalChecksum|ExternalSource|If|Region)(?:\b_[ \t]*(?:\r\n?|\n)|.)+/i,alias:"property",greedy:!0},string:{pattern:/\$?["“”](?:["“”]{2}|[^"“”])*["“”]C?/i,greedy:!0},date:{pattern:/#[ \t]*(?:\d+([/-])\d+\1\d+(?:[ \t]+(?:\d+[ \t]*(?:AM|PM)|\d+:\d+(?::\d+)?(?:[ \t]*(?:AM|PM))?))?|\d+[ \t]*(?:AM|PM)|\d+:\d+(?::\d+)?(?:[ \t]*(?:AM|PM))?)[ \t]*#/i,alias:"number"},number:/(?:(?:\b\d+(?:\.\d+)?|\.\d+)(?:E[+-]?\d+)?|&[HO][\dA-F]+)(?:[FRD]|U?[ILS])?/i,boolean:/\b(?:False|Nothing|True)\b/i,keyword:/\b(?:AddHandler|AddressOf|Alias|And(?:Also)?|As|Boolean|ByRef|Byte|ByVal|Call|Case|Catch|C(?:Bool|Byte|Char|Date|Dbl|Dec|Int|Lng|Obj|SByte|Short|Sng|Str|Type|UInt|ULng|UShort)|Char|Class|Const|Continue|Currency|Date|Decimal|Declare|Default|Delegate|Dim|DirectCast|Do|Double|Each|Else(?:If)?|End(?:If)?|Enum|Erase|Error|Event|Exit|Finally|For|Friend|Function|Get(?:Type|XMLNamespace)?|Global|GoSub|GoTo|Handles|If|Implements|Imports|In|Inherits|Integer|Interface|Is|IsNot|Let|Lib|Like|Long|Loop|Me|Mod|Module|Must(?:Inherit|Override)|My(?:Base|Class)|Namespace|Narrowing|New|Next|Not(?:Inheritable|Overridable)?|Object|Of|On|Operator|Option(?:al)?|Or(?:Else)?|Out|Overloads|Overridable|Overrides|ParamArray|Partial|Private|Property|Protected|Public|RaiseEvent|ReadOnly|ReDim|RemoveHandler|Resume|Return|SByte|Select|Set|Shadows|Shared|short|Single|Static|Step|Stop|String|Structure|Sub|SyncLock|Then|Throw|To|Try|TryCast|Type|TypeOf|U(?:Integer|Long|Short)|Until|Using|Variant|Wend|When|While|Widening|With(?:Events)?|WriteOnly|Xor)\b/i,operator:/[+\-*/\\^<=>&#@$%!]|\b_(?=[ \t]*[\r\n])/,punctuation:/[{}().,:?]/},Prism.languages.vb=Prism.languages["visual-basic"],Prism.languages.vba=Prism.languages["visual-basic"];