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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/arturo.js +1

@@ -0,0 +1 @@
		1	!function(e){var a=function(a,t){return{pattern:RegExp("\\{!(?:"+(t\|\|a)+")$[^]\\}","m"),greedy:!0,inside:{embedded:{pattern:/(^\{!\w+\b)[\s\S]+(?=\}$)/,lookbehind:!0,alias:"language-"+a,inside:e.languages[a]},string:/[\s\S]+/}}};e.languages.arturo={comment:{pattern:/;./,greedy:!0},character:{pattern:/`.`/,alias:"char",greedy:!0},number:{pattern:/\b\d+(?:\.\d+(?:\.\d+(?:-[\w+-]+)?)?)?\b/},string:{pattern:/"(?:[^"\\\r\n]\|\\.)"/,greedy:!0},regex:{pattern:/\{\/.?\/\}/,greedy:!0},"html-string":a("html"),"css-string":a("css"),"js-string":a("js"),"md-string":a("md"),"sql-string":a("sql"),"sh-string":a("shell","sh"),multistring:{pattern:/».\|\{:[\s\S]?:\}\|\{[\s\S]?\}\|^-{6}$[\s\S]/m,alias:"string",greedy:!0},label:{pattern:/\w+\b\??:/,alias:"property"},literal:{pattern:/'(?:\w+\b\??:?)/,alias:"constant"},type:{pattern:/:(?:\w+\b\??:?)/,alias:"class-name"},color:/#\w+/,predicate:{pattern:/\b(?:all\|and\|any\|ascii\|attr\|attribute\|attributeLabel\|binary\|block\|char\|contains\|database\|date\|dictionary\|empty\|equal\|even\|every\|exists\|false\|floating\|function\|greater\|greaterOrEqual\|if\|in\|inline\|integer\|is\|key\|label\|leap\|less\|lessOrEqual\|literal\|logical\|lower\|nand\|negative\|nor\|not\|notEqual\|null\|numeric\|odd\|or\|path\|pathLabel\|positive\|prefix\|prime\|regex\|same\|set\|some\|sorted\|standalone\|string\|subset\|suffix\|superset\|symbol\|symbolLiteral\|true\|try\|type\|unless\|upper\|when\|whitespace\|word\|xnor\|xor\|zero)\?/,alias:"keyword"},"builtin-function":{pattern:/\b(?:abs\|acos\|acosh\|acsec\|acsech\|actan\|actanh\|add\|after\|alert\|alias\|and\|angle\|append\|arg\|args\|arity\|array\|as\|asec\|asech\|asin\|asinh\|atan\|atan2\|atanh\|attr\|attrs\|average\|before\|benchmark\|blend\|break\|call\|capitalize\|case\|ceil\|chop\|clear\|clip\|close\|color\|combine\|conj\|continue\|copy\|cos\|cosh\|crc\|csec\|csech\|ctan\|ctanh\|cursor\|darken\|dec\|decode\|define\|delete\|desaturate\|deviation\|dialog\|dictionary\|difference\|digest\|digits\|div\|do\|download\|drop\|dup\|e\|else\|empty\|encode\|ensure\|env\|escape\|execute\|exit\|exp\|extend\|extract\|factors\|fdiv\|filter\|first\|flatten\|floor\|fold\|from\|function\|gamma\|gcd\|get\|goto\|hash\|hypot\|if\|inc\|indent\|index\|infinity\|info\|input\|insert\|inspect\|intersection\|invert\|jaro\|join\|keys\|kurtosis\|last\|let\|levenshtein\|lighten\|list\|ln\|log\|loop\|lower\|mail\|map\|match\|max\|median\|min\|mod\|module\|mul\|nand\|neg\|new\|nor\|normalize\|not\|now\|null\|open\|or\|outdent\|pad\|palette\|panic\|path\|pause\|permissions\|permutate\|pi\|pop\|popup\|pow\|powerset\|powmod\|prefix\|print\|prints\|process\|product\|query\|random\|range\|read\|relative\|remove\|rename\|render\|repeat\|replace\|request\|return\|reverse\|round\|sample\|saturate\|script\|sec\|sech\|select\|serve\|set\|shl\|shr\|shuffle\|sin\|sinh\|size\|skewness\|slice\|sort\|spin\|split\|sqrt\|squeeze\|stack\|strip\|sub\|suffix\|sum\|switch\|symbols\|symlink\|sys\|take\|tan\|tanh\|terminal\|terminate\|to\|truncate\|try\|type\|unclip\|union\|unique\|unless\|until\|unzip\|upper\|values\|var\|variance\|volume\|webview\|while\|with\|wordwrap\|write\|xnor\|xor\|zip)\b/,alias:"keyword"},sugar:{pattern:/->\|=>\|\\|\|::/,alias:"operator"},punctuation:/[()[\],]/,symbol:{pattern:/<:\|-:\|ø\|@\|#\|\+\|\\|\|\*\|\$\|---\|-\|%\|\/\|\.\.\|\^\|~\|=\|<\|>\|\\/},boolean:{pattern:/\b(?:false\|maybe\|true)\b/}},e.languages.art=e.languages.arturo}(Prism);