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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/io.js +1

@@ -0,0 +1 @@
		1	Prism.languages.io={comment:{pattern:/(^\|[^\\])(?:\/\[\s\S]?(?:\\/\|$)\|\/\/.\|#.)/,lookbehind:!0,greedy:!0},"triple-quoted-string":{pattern:/"""(?:\\[\s\S]\|(?!""")[^\\])"""/,greedy:!0,alias:"string"},string:{pattern:/"(?:\\.\|[^\\\r\n"])"/,greedy:!0},keyword:/\b(?:activate\|activeCoroCount\|asString\|block\|break\|call\|catch\|clone\|collectGarbage\|compileString\|continue\|do\|doFile\|doMessage\|doString\|else\|elseif\|exit\|for\|foreach\|forward\|getEnvironmentVariable\|getSlot\|hasSlot\|if\|ifFalse\|ifNil\|ifNilEval\|ifTrue\|isActive\|isNil\|isResumable\|list\|message\|method\|parent\|pass\|pause\|perform\|performWithArgList\|print\|println\|proto\|raise\|raiseResumable\|removeSlot\|resend\|resume\|schedulerSleepSeconds\|self\|sender\|setSchedulerSleepSeconds\|setSlot\|shallowCopy\|slotNames\|super\|system\|then\|thisBlock\|thisContext\|try\|type\|uniqueId\|updateSlot\|wait\|while\|write\|yield)\b/,builtin:/\b(?:Array\|AudioDevice\|AudioMixer\|BigNum\|Block\|Box\|Buffer\|CFunction\|CGI\|Color\|Curses\|DBM\|DNSResolver\|DOConnection\|DOProxy\|DOServer\|Date\|Directory\|Duration\|DynLib\|Error\|Exception\|FFT\|File\|Fnmatch\|Font\|Future\|GL\|GLE\|GLScissor\|GLU\|GLUCylinder\|GLUQuadric\|GLUSphere\|GLUT\|Host\|Image\|Importer\|LinkList\|List\|Lobby\|Locals\|MD5\|MP3Decoder\|MP3Encoder\|Map\|Message\|Movie\|Notification\|Number\|Object\|OpenGL\|Point\|Protos\|Random\|Regex\|SGML\|SGMLElement\|SGMLParser\|SQLite\|Sequence\|Server\|ShowMessage\|SleepyCat\|SleepyCatCursor\|Socket\|SocketManager\|Sound\|Soup\|Store\|String\|Tree\|UDPSender\|UPDReceiver\|URL\|User\|Warning\|WeakLink)\b/,boolean:/\b(?:false\|nil\|true)\b/,number:/\b0x[\da-f]+\b\|(?:\b\d+(?:\.\d)?\|\B\.\d+)(?:e-?\d+)?/i,operator:/[=!/%+\-^&\|]=\|>>?=?\|<<?=?\|:?:?=\|\+\+?\|--?\|\\*?\|\/\/?\|%\|\\|\\|?\|&&?\|\b(?:and\|not\|or\|return)\b\|@@?\|\?\??\|\.\./,punctuation:/[{}[\];(),.:]/};