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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/pug.js +1

@@ -0,0 +1 @@
1 !function(e){e.languages.pug={comment:{pattern:/(^([\t ]*))\/\/.*(?:(?:\r?\n|\r)\2[\t ].+)*/m,lookbehind:!0},"multiline-script":{pattern:/(^([\t ]*)script\b.*\.[\t ]*)(?:(?:\r?\n|\r(?!\n))(?:\2[\t ].+|\s*?(?=\r?\n|\r)))+/m,lookbehind:!0,inside:e.languages.javascript},filter:{pattern:/(^([\t ]*)):.+(?:(?:\r?\n|\r(?!\n))(?:\2[\t ].+|\s*?(?=\r?\n|\r)))+/m,lookbehind:!0,inside:{"filter-name":{pattern:/^:[\w-]+/,alias:"variable"},text:/\S[\s\S]*/}},"multiline-plain-text":{pattern:/(^([\t ]*)[\w\-#.]+\.[\t ]*)(?:(?:\r?\n|\r(?!\n))(?:\2[\t ].+|\s*?(?=\r?\n|\r)))+/m,lookbehind:!0},markup:{pattern:/(^[\t ]*)<.+/m,lookbehind:!0,inside:e.languages.markup},doctype:{pattern:/((?:^|\n)[\t ]*)doctype(?: .+)?/,lookbehind:!0},"flow-control":{pattern:/(^[\t ]*)(?:case|default|each|else|if|unless|when|while)\b(?: .+)?/m,lookbehind:!0,inside:{each:{pattern:/^each .+? in\b/,inside:{keyword:/\b(?:each|in)\b/,punctuation:/,/}},branch:{pattern:/^(?:case|default|else|if|unless|when|while)\b/,alias:"keyword"},rest:e.languages.javascript}},keyword:{pattern:/(^[\t ]*)(?:append|block|extends|include|prepend)\b.+/m,lookbehind:!0},mixin:[{pattern:/(^[\t ]*)mixin .+/m,lookbehind:!0,inside:{keyword:/^mixin/,function:/\w+(?=\s*\(|\s*$)/,punctuation:/[(),.]/}},{pattern:/(^[\t ]*)\+.+/m,lookbehind:!0,inside:{name:{pattern:/^\+\w+/,alias:"function"},rest:e.languages.javascript}}],script:{pattern:/(^[\t ]*script(?:(?:&[^(]+)?\([^)]+\))*[\t ]).+/m,lookbehind:!0,inside:e.languages.javascript},"plain-text":{pattern:/(^[\t ]*(?!-)[\w\-#.]*[\w\-](?:(?:&[^(]+)?\([^)]+\))*\/?[\t ]).+/m,lookbehind:!0},tag:{pattern:/(^[\t ]*)(?!-)[\w\-#.]*[\w\-](?:(?:&[^(]+)?\([^)]+\))*\/?:?/m,lookbehind:!0,inside:{attributes:[{pattern:/&[^(]+\([^)]+\)/,inside:e.languages.javascript},{pattern:/\([^)]+\)/,inside:{"attr-value":{pattern:/(=\s*(?!\s))(?:\{[^}]*\}|[^,)\r\n]+)/,lookbehind:!0,inside:e.languages.javascript},"attr-name":/[\w-]+(?=\s*!?=|\s*[,)])/,punctuation:/[!=(),]+/}}],punctuation:/:/,"attr-id":/#[\w\-]+/,"attr-class":/\.[\w\-]+/}},code:[{pattern:/(^[\t ]*(?:-|!?=)).+/m,lookbehind:!0,inside:e.languages.javascript}],punctuation:/[.\-!=|]+/};for(var t=[{filter:"atpl",language:"twig"},{filter:"coffee",language:"coffeescript"},"ejs","handlebars","less","livescript","markdown",{filter:"sass",language:"scss"},"stylus"],n={},a=0,i=t.length;a<i;a++){var r=t[a];r="string"==typeof r?{filter:r,language:r}:r,e.languages[r.language]&&(n["filter-"+r.filter]={pattern:RegExp("(^([\t ]*)):<filter_name>(?:(?:\r?\n|\r(?!\n))(?:\\2[\t ].+|\\s*?(?=\r?\n|\r)))+".replace("<filter_name>",(function(){return r.filter})),"m"),lookbehind:!0,inside:{"filter-name":{pattern:/^:[\w-]+/,alias:"variable"},text:{pattern:/\S[\s\S]*/,alias:[r.language,"language-"+r.language],inside:e.languages[r.language]}}})}e.languages.insertBefore("pug","filter",n)}(Prism);