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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/applescript.js +1

@@ -0,0 +1 @@
		1	Prism.languages.applescript={comment:[/\(\(?:\(\(?:[^]\|\(?!\)))\\)\|(?!\(\)[\s\S])?\\)/,/--.+/,/#.+/],string:/"(?:\\.\|[^"\\\r\n])"/,number:/(?:\b\d+(?:\.\d)?\|\B\.\d+)(?:e-?\d+)?\b/i,operator:[/[&=≠≤≥+\-\/÷^]\|[<>]=?/,/\b(?:(?:begin\|end\|start)s? with\|(?:contains?\|(?:does not\|doesn't) contain)\|(?:is\|isn't\|is not) (?:contained by\|in)\|(?:(?:is\|isn't\|is not) )?(?:greater\|less) than(?: or equal)?(?: to)?\|(?:comes\|(?:does not\|doesn't) come) (?:after\|before)\|(?:is\|isn't\|is not) equal(?: to)?\|(?:(?:does not\|doesn't) equal\|equal to\|equals\|is not\|isn't)\|(?:a )?(?:ref(?: to)?\|reference to)\|(?:and\|as\|div\|mod\|not\|or))\b/],keyword:/\b(?:about\|above\|after\|against\|apart from\|around\|aside from\|at\|back\|before\|beginning\|behind\|below\|beneath\|beside\|between\|but\|by\|considering\|continue\|copy\|does\|eighth\|else\|end\|equal\|error\|every\|exit\|false\|fifth\|first\|for\|fourth\|from\|front\|get\|given\|global\|if\|ignoring\|in\|instead of\|into\|is\|it\|its\|last\|local\|me\|middle\|my\|ninth\|of\|on\|onto\|out of\|over\|prop\|property\|put\|repeat\|return\|returning\|second\|set\|seventh\|since\|sixth\|some\|tell\|tenth\|that\|the\|then\|third\|through\|thru\|timeout\|times\|to\|transaction\|true\|try\|until\|where\|while\|whose\|with\|without)\b/,"class-name":/\b(?:POSIX file\|RGB color\|alias\|application\|boolean\|centimeters\|centimetres\|class\|constant\|cubic centimeters\|cubic centimetres\|cubic feet\|cubic inches\|cubic meters\|cubic metres\|cubic yards\|date\|degrees Celsius\|degrees Fahrenheit\|degrees Kelvin\|feet\|file\|gallons\|grams\|inches\|integer\|kilograms\|kilometers\|kilometres\|list\|liters\|litres\|meters\|metres\|miles\|number\|ounces\|pounds\|quarts\|real\|record\|reference\|script\|square feet\|square kilometers\|square kilometres\|square meters\|square metres\|square miles\|square yards\|text\|yards)\b/,punctuation:/[{}():,¬«»《》]/};