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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/haml.js +1

@@ -0,0 +1 @@
1 !function(n){n.languages.haml={"multiline-comment":{pattern:/((?:^|\r?\n|\r)([\t ]*))(?:\/|-#).*(?:(?:\r?\n|\r)\2[\t ].+)*/,lookbehind:!0,alias:"comment"},"multiline-code":[{pattern:/((?:^|\r?\n|\r)([\t ]*)(?:[~-]|[&!]?=)).*,[\t ]*(?:(?:\r?\n|\r)\2[\t ].*,[\t ]*)*(?:(?:\r?\n|\r)\2[\t ].+)/,lookbehind:!0,inside:n.languages.ruby},{pattern:/((?:^|\r?\n|\r)([\t ]*)(?:[~-]|[&!]?=)).*\|[\t ]*(?:(?:\r?\n|\r)\2[\t ].*\|[\t ]*)*/,lookbehind:!0,inside:n.languages.ruby}],filter:{pattern:/((?:^|\r?\n|\r)([\t ]*)):[\w-]+(?:(?:\r?\n|\r)(?:\2[\t ].+|\s*?(?=\r?\n|\r)))+/,lookbehind:!0,inside:{"filter-name":{pattern:/^:[\w-]+/,alias:"symbol"}}},markup:{pattern:/((?:^|\r?\n|\r)[\t ]*)<.+/,lookbehind:!0,inside:n.languages.markup},doctype:{pattern:/((?:^|\r?\n|\r)[\t ]*)!!!(?: .+)?/,lookbehind:!0},tag:{pattern:/((?:^|\r?\n|\r)[\t ]*)[%.#][\w\-#.]*[\w\-](?:\([^)]+\)|\{(?:\{[^}]+\}|[^{}])+\}|\[[^\]]+\])*[\/<>]*/,lookbehind:!0,inside:{attributes:[{pattern:/(^|[^#])\{(?:\{[^}]+\}|[^{}])+\}/,lookbehind:!0,inside:n.languages.ruby},{pattern:/\([^)]+\)/,inside:{"attr-value":{pattern:/(=\s*)(?:"(?:\\.|[^\\"\r\n])*"|[^)\s]+)/,lookbehind:!0},"attr-name":/[\w:-]+(?=\s*!?=|\s*[,)])/,punctuation:/[=(),]/}},{pattern:/\[[^\]]+\]/,inside:n.languages.ruby}],punctuation:/[<>]/}},code:{pattern:/((?:^|\r?\n|\r)[\t ]*(?:[~-]|[&!]?=)).+/,lookbehind:!0,inside:n.languages.ruby},interpolation:{pattern:/#\{[^}]+\}/,inside:{delimiter:{pattern:/^#\{|\}$/,alias:"punctuation"},ruby:{pattern:/[\s\S]+/,inside:n.languages.ruby}}},punctuation:{pattern:/((?:^|\r?\n|\r)[\t ]*)[~=\-&!]+/,lookbehind:!0}};for(var e=["css",{filter:"coffee",language:"coffeescript"},"erb","javascript","less","markdown","ruby","scss","textile"],t={},r=0,a=e.length;r<a;r++){var i=e[r];i="string"==typeof i?{filter:i,language:i}:i,n.languages[i.language]&&(t["filter-"+i.filter]={pattern:RegExp("((?:^|\\r?\\n|\\r)([\\t ]*)):{{filter_name}}(?:(?:\\r?\\n|\\r)(?:\\2[\\t ].+|\\s*?(?=\\r?\\n|\\r)))+".replace("{{filter_name}}",(function(){return i.filter}))),lookbehind:!0,inside:{"filter-name":{pattern:/^:[\w-]+/,alias:"symbol"},text:{pattern:/[\s\S]+/,alias:[i.language,"language-"+i.language],inside:n.languages[i.language]}}})}n.languages.insertBefore("haml","filter",t)}(Prism);