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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/javadoc.js +1

@@ -0,0 +1 @@
1 !function(a){var e=/(^(?:[\t ]*(?:\*\s*)*))[^*\s].*$/m,n="(?:\\b[a-zA-Z]\\w+\\s*\\.\\s*)*\\b[A-Z]\\w*(?:\\s*<mem>)?|<mem>".replace(/<mem>/g,(function(){return"#\\s*\\w+(?:\\s*\\([^()]*\\))?"}));a.languages.javadoc=a.languages.extend("javadoclike",{}),a.languages.insertBefore("javadoc","keyword",{reference:{pattern:RegExp("(@(?:exception|link|linkplain|see|throws|value)\\s+(?:\\*\\s*)?)(?:"+n+")"),lookbehind:!0,inside:{function:{pattern:/(#\s*)\w+(?=\s*\()/,lookbehind:!0},field:{pattern:/(#\s*)\w+/,lookbehind:!0},namespace:{pattern:/\b(?:[a-z]\w*\s*\.\s*)+/,inside:{punctuation:/\./}},"class-name":/\b[A-Z]\w*/,keyword:a.languages.java.keyword,punctuation:/[#()[\],.]/}},"class-name":{pattern:/(@param\s+)<[A-Z]\w*>/,lookbehind:!0,inside:{punctuation:/[.<>]/}},"code-section":[{pattern:/(\{@code\s+(?!\s))(?:[^\s{}]|\s+(?![\s}])|\{(?:[^{}]|\{(?:[^{}]|\{(?:[^{}]|\{[^{}]*\})*\})*\})*\})+(?=\s*\})/,lookbehind:!0,inside:{code:{pattern:e,lookbehind:!0,inside:a.languages.java,alias:"language-java"}}},{pattern:/(<(code|pre|tt)>(?!<code>)\s*)\S(?:\S|\s+\S)*?(?=\s*<\/\2>)/,lookbehind:!0,inside:{line:{pattern:e,lookbehind:!0,inside:{tag:a.languages.markup.tag,entity:a.languages.markup.entity,code:{pattern:/.+/,inside:a.languages.java,alias:"language-java"}}}}}],tag:a.languages.markup.tag,entity:a.languages.markup.entity}),a.languages.javadoclike.addSupport("java",a.languages.javadoc)}(Prism);