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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/antlr4.js +1

@@ -0,0 +1 @@
1 Prism.languages.antlr4={comment:/\/\/.*|\/\*[\s\S]*?(?:\*\/|$)/,string:{pattern:/'(?:\\.|[^\\'\r\n])*'/,greedy:!0},"character-class":{pattern:/\[(?:\\.|[^\\\]\r\n])*\]/,greedy:!0,alias:"regex",inside:{range:{pattern:/([^[]|(?:^|[^\\])(?:\\\\)*\\\[)-(?!\])/,lookbehind:!0,alias:"punctuation"},escape:/\\(?:u(?:[a-fA-F\d]{4}|\{[a-fA-F\d]+\})|[pP]\{[=\w-]+\}|[^\r\nupP])/,punctuation:/[\[\]]/}},action:{pattern:/\{(?:[^{}]|\{(?:[^{}]|\{(?:[^{}]|\{[^{}]*\})*\})*\})*\}/,greedy:!0,inside:{content:{pattern:/(\{)[\s\S]+(?=\})/,lookbehind:!0},punctuation:/[{}]/}},command:{pattern:/(->\s*(?!\s))(?:\s*(?:,\s*)?\b[a-z]\w*(?:\s*\([^()\r\n]*\))?)+(?=\s*;)/i,lookbehind:!0,inside:{function:/\b\w+(?=\s*(?:[,(]|$))/,punctuation:/[,()]/}},annotation:{pattern:/@\w+(?:::\w+)*/,alias:"keyword"},label:{pattern:/#[ \t]*\w+/,alias:"punctuation"},keyword:/\b(?:catch|channels|finally|fragment|grammar|import|lexer|locals|mode|options|parser|returns|throws|tokens)\b/,definition:[{pattern:/\b[a-z]\w*(?=\s*:)/,alias:["rule","class-name"]},{pattern:/\b[A-Z]\w*(?=\s*:)/,alias:["token","constant"]}],constant:/\b[A-Z][A-Z_]*\b/,operator:/\.\.|->|[|~]|[*+?]\??/,punctuation:/[;:()=]/},Prism.languages.g4=Prism.languages.antlr4;