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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/nevod.js +1

@@ -0,0 +1 @@
		1	Prism.languages.nevod={comment:/\/\/.\|(?:\/\[\s\S]?(?:\\/\|$))/,string:{pattern:/(?:"(?:""\|[^"])"(?!")\|'(?:''\|[^'])'(?!'))!?\?/,greedy:!0,inside:{"string-attrs":/!$\|!\$\|\$/}},namespace:{pattern:/(@namespace\s+)[a-zA-Z0-9\-.]+(?=\s\{)/,lookbehind:!0},pattern:{pattern:/(@pattern\s+)?#?[a-zA-Z0-9\-.]+(?:\s$\s(?:~\s)?[a-zA-Z0-9\-.]+\s(?:,\s(?:~\s)?[a-zA-Z0-9\-.])$)?(?=\s=)/,lookbehind:!0,inside:{"pattern-name":{pattern:/^#?[a-zA-Z0-9\-.]+/,alias:"class-name"},fields:{pattern:/$.$/,inside:{"field-name":{pattern:/[a-zA-Z0-9\-.]+/,alias:"variable"},punctuation:/[,()]/,operator:{pattern:/~/,alias:"field-hidden-mark"}}}}},search:{pattern:/(@search\s+\|#)[a-zA-Z0-9\-.]+(?:\.\)?(?=\s;)/,alias:"function",lookbehind:!0},keyword:/@(?:having\|inside\|namespace\|outside\|pattern\|require\|search\|where)\b/,"standard-pattern":{pattern:/\b(?:Alpha\|AlphaNum\|Any\|Blank\|End\|LineBreak\|Num\|NumAlpha\|Punct\|Space\|Start\|Symbol\|Word\|WordBreak)\b(?:$[a-zA-Z0-9\-.,\s+]$)?/,inside:{"standard-pattern-name":{pattern:/^[a-zA-Z0-9\-.]+/,alias:"builtin"},quantifier:{pattern:/\b\d+(?:\s\+\|\s-\s\d+)?(?!\w)/,alias:"number"},"standard-pattern-attr":{pattern:/[a-zA-Z0-9\-.]+/,alias:"builtin"},punctuation:/[,()]/}},quantifier:{pattern:/\b\d+(?:\s\+\|\s-\s\d+)?(?!\w)/,alias:"number"},operator:[{pattern:/=/,alias:"pattern-def"},{pattern:/&/,alias:"conjunction"},{pattern:/~/,alias:"exception"},{pattern:/\?/,alias:"optionality"},{pattern:/[[\]]/,alias:"repetition"},{pattern:/[{}]/,alias:"variation"},{pattern:/[+_]/,alias:"sequence"},{pattern:/\.{2,3}/,alias:"span"}],"field-capture":[{pattern:/([a-zA-Z0-9\-.]+\s$)\s[a-zA-Z0-9\-.]+\s:\s[a-zA-Z0-9\-.]+(?:\s,\s[a-zA-Z0-9\-.]+\s:\s[a-zA-Z0-9\-.]+)(?=\s$)/,lookbehind:!0,inside:{"field-name":{pattern:/[a-zA-Z0-9\-.]+/,alias:"variable"},colon:/:/}},{pattern:/[a-zA-Z0-9\-.]+\s:/,inside:{"field-name":{pattern:/[a-zA-Z0-9\-.]+/,alias:"variable"},colon:/:/}}],punctuation:/[:;,()]/,name:/[a-zA-Z0-9\-.]+/};

@@ -0,0 +1 @@
		1	Prism.languages.nevod={comment:/\/\/.\|(?:\/\[\s\S]?(?:\\/\|$))/,string:{pattern:/(?:"(?:""\|[^"])"(?!")\|'(?:''\|[^'])'(?!'))!?\?/,greedy:!0,inside:{"string-attrs":/!$\|!\$\|\$/}},namespace:{pattern:/(@namespace\s+)[a-zA-Z0-9\-.]+(?=\s\{)/,lookbehind:!0},pattern:{pattern:/(@pattern\s+)?#?[a-zA-Z0-9\-.]+(?:\s\(\s(?:~\s)?[a-zA-Z0-9\-.]+\s(?:,\s(?:~\s)?[a-zA-Z0-9\-.])\))?(?=\s=)/,lookbehind:!0,inside:{"pattern-name":{pattern:/^#?[a-zA-Z0-9\-.]+/,alias:"class-name"},fields:{pattern:/\(.\)/,inside:{"field-name":{pattern:/[a-zA-Z0-9\-.]+/,alias:"variable"},punctuation:/[,()]/,operator:{pattern:/~/,alias:"field-hidden-mark"}}}}},search:{pattern:/(@search\s+\|#)[a-zA-Z0-9\-.]+(?:\.\)?(?=\s;)/,alias:"function",lookbehind:!0},keyword:/@(?:having\|inside\|namespace\|outside\|pattern\|require\|search\|where)\b/,"standard-pattern":{pattern:/\b(?:Alpha\|AlphaNum\|Any\|Blank\|End\|LineBreak\|Num\|NumAlpha\|Punct\|Space\|Start\|Symbol\|Word\|WordBreak)\b(?:\([a-zA-Z0-9\-.,\s+]\))?/,inside:{"standard-pattern-name":{pattern:/^[a-zA-Z0-9\-.]+/,alias:"builtin"},quantifier:{pattern:/\b\d+(?:\s\+\|\s-\s\d+)?(?!\w)/,alias:"number"},"standard-pattern-attr":{pattern:/[a-zA-Z0-9\-.]+/,alias:"builtin"},punctuation:/[,()]/}},quantifier:{pattern:/\b\d+(?:\s\+\|\s-\s\d+)?(?!\w)/,alias:"number"},operator:[{pattern:/=/,alias:"pattern-def"},{pattern:/&/,alias:"conjunction"},{pattern:/~/,alias:"exception"},{pattern:/\?/,alias:"optionality"},{pattern:/[[\]]/,alias:"repetition"},{pattern:/[{}]/,alias:"variation"},{pattern:/[+_]/,alias:"sequence"},{pattern:/\.{2,3}/,alias:"span"}],"field-capture":[{pattern:/([a-zA-Z0-9\-.]+\s\()\s[a-zA-Z0-9\-.]+\s:\s[a-zA-Z0-9\-.]+(?:\s,\s[a-zA-Z0-9\-.]+\s:\s[a-zA-Z0-9\-.]+)(?=\s\))/,lookbehind:!0,inside:{"field-name":{pattern:/[a-zA-Z0-9\-.]+/,alias:"variable"},colon:/:/}},{pattern:/[a-zA-Z0-9\-.]+\s:/,inside:{"field-name":{pattern:/[a-zA-Z0-9\-.]+/,alias:"variable"},colon:/:/}}],punctuation:/[:;,()]/,name:/[a-zA-Z0-9\-.]+/};