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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/cfscript.js +1

@@ -0,0 +1 @@
1 Prism.languages.cfscript=Prism.languages.extend("clike",{comment:[{pattern:/(^|[^\\])\/\*[\s\S]*?(?:\*\/|$)/,lookbehind:!0,inside:{annotation:{pattern:/(?:^|[^.])@[\w\.]+/,alias:"punctuation"}}},{pattern:/(^|[^\\:])\/\/.*/,lookbehind:!0,greedy:!0}],keyword:/\b(?:abstract|break|catch|component|continue|default|do|else|extends|final|finally|for|function|if|in|include|package|private|property|public|remote|required|rethrow|return|static|switch|throw|try|var|while|xml)\b(?!\s*=)/,operator:[/\+\+|--|&&|\|\||::|=>|[!=]==|[-+*/%&|^!=<>]=?|\?(?:\.|:)?|:/,/\b(?:and|contains|eq|equal|eqv|gt|gte|imp|is|lt|lte|mod|not|or|xor)\b/],scope:{pattern:/\b(?:application|arguments|cgi|client|cookie|local|session|super|this|variables)\b/,alias:"global"},type:{pattern:/\b(?:any|array|binary|boolean|date|guid|numeric|query|string|struct|uuid|void|xml)\b/,alias:"builtin"}}),Prism.languages.insertBefore("cfscript","keyword",{"function-variable":{pattern:/[_$a-zA-Z\xA0-\uFFFF](?:(?!\s)[$\w\xA0-\uFFFF])*(?=\s*[=:]\s*(?:\bfunction\b|(?:\((?:[^()]|\([^()]*\))*\)|(?!\s)[_$a-zA-Z\xA0-\uFFFF](?:(?!\s)[$\w\xA0-\uFFFF])*)\s*=>))/,alias:"function"}}),delete Prism.languages.cfscript["class-name"],Prism.languages.cfc=Prism.languages.cfscript;