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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/solidity.js +1

@@ -0,0 +1 @@
1 Prism.languages.solidity=Prism.languages.extend("clike",{"class-name":{pattern:/(\b(?:contract|enum|interface|library|new|struct|using)\s+)(?!\d)[\w$]+/,lookbehind:!0},keyword:/\b(?:_|anonymous|as|assembly|assert|break|calldata|case|constant|constructor|continue|contract|default|delete|do|else|emit|enum|event|external|for|from|function|if|import|indexed|inherited|interface|internal|is|let|library|mapping|memory|modifier|new|payable|pragma|private|public|pure|require|returns?|revert|selfdestruct|solidity|storage|struct|suicide|switch|this|throw|using|var|view|while)\b/,operator:/=>|->|:=|=:|\*\*|\+\+|--|\|\||&&|<<=?|>>=?|[-+*/%^&|<>!=]=?|[~?]/}),Prism.languages.insertBefore("solidity","keyword",{builtin:/\b(?:address|bool|byte|u?int(?:8|16|24|32|40|48|56|64|72|80|88|96|104|112|120|128|136|144|152|160|168|176|184|192|200|208|216|224|232|240|248|256)?|string|bytes(?:[1-9]|[12]\d|3[0-2])?)\b/}),Prism.languages.insertBefore("solidity","number",{version:{pattern:/([<>]=?|\^)\d+\.\d+\.\d+\b/,lookbehind:!0,alias:"number"}}),Prism.languages.sol=Prism.languages.solidity;