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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/robotframework.js +1

@@ -0,0 +1 @@
1 !function(t){var n={pattern:/(^[ \t]*| {2}|\t)#.*/m,lookbehind:!0,greedy:!0},e={pattern:/((?:^|[^\\])(?:\\{2})*)[$@&%]\{(?:[^{}\r\n]|\{[^{}\r\n]*\})*\}/,lookbehind:!0,inside:{punctuation:/^[$@&%]\{|\}$/}};function a(t,a){var r={"section-header":{pattern:/^ ?\*{3}.+?\*{3}/,alias:"keyword"}};for(var o in a)r[o]=a[o];return r.tag={pattern:/([\r\n](?: {2}|\t)[ \t]*)\[[-\w]+\]/,lookbehind:!0,inside:{punctuation:/\[|\]/}},r.variable=e,r.comment=n,{pattern:RegExp("^ ?\\*{3}[ \t]*<name>[ \t]*\\*{3}(?:.|[\r\n](?!\\*{3}))*".replace(/<name>/g,(function(){return t})),"im"),alias:"section",inside:r}}var r={pattern:/(\[Documentation\](?: {2}|\t)[ \t]*)(?![ \t]|#)(?:.|(?:\r\n?|\n)[ \t]*\.{3})+/,lookbehind:!0,alias:"string"},o={pattern:/([\r\n] ?)(?!#)(?:\S(?:[ \t]\S)*)+/,lookbehind:!0,alias:"function",inside:{variable:e}},i={pattern:/([\r\n](?: {2}|\t)[ \t]*)(?!\[|\.{3}|#)(?:\S(?:[ \t]\S)*)+/,lookbehind:!0,inside:{variable:e}};t.languages.robotframework={settings:a("Settings",{documentation:{pattern:/([\r\n] ?Documentation(?: {2}|\t)[ \t]*)(?![ \t]|#)(?:.|(?:\r\n?|\n)[ \t]*\.{3})+/,lookbehind:!0,alias:"string"},property:{pattern:/([\r\n] ?)(?!\.{3}|#)(?:\S(?:[ \t]\S)*)+/,lookbehind:!0}}),variables:a("Variables"),"test-cases":a("Test Cases",{"test-name":o,documentation:r,property:i}),keywords:a("Keywords",{"keyword-name":o,documentation:r,property:i}),tasks:a("Tasks",{"task-name":o,documentation:r,property:i}),comment:n},t.languages.robot=t.languages.robotframework}(Prism);