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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/haxe.js +1

@@ -0,0 +1 @@
1 Prism.languages.haxe=Prism.languages.extend("clike",{string:{pattern:/"(?:[^"\\]|\\[\s\S])*"/,greedy:!0},"class-name":[{pattern:/(\b(?:abstract|class|enum|extends|implements|interface|new|typedef)\s+)[A-Z_]\w*/,lookbehind:!0},/\b[A-Z]\w*/],keyword:/\bthis\b|\b(?:abstract|as|break|case|cast|catch|class|continue|default|do|dynamic|else|enum|extends|extern|final|for|from|function|if|implements|import|in|inline|interface|macro|new|null|operator|overload|override|package|private|public|return|static|super|switch|throw|to|try|typedef|untyped|using|var|while)(?!\.)\b/,function:{pattern:/\b[a-z_]\w*(?=\s*(?:<[^<>]*>\s*)?\()/i,greedy:!0},operator:/\.{3}|\+\+|--|&&|\|\||->|=>|(?:<<?|>{1,3}|[-+*/%!=&|^])=?|[?:~]/}),Prism.languages.insertBefore("haxe","string",{"string-interpolation":{pattern:/'(?:[^'\\]|\\[\s\S])*'/,greedy:!0,inside:{interpolation:{pattern:/(^|[^\\])\$(?:\w+|\{[^{}]+\})/,lookbehind:!0,inside:{"interpolation-punctuation":{pattern:/^\$\{?|\}$/,alias:"punctuation"},expression:{pattern:/[\s\S]+/,inside:Prism.languages.haxe}}},string:/[\s\S]+/}}}),Prism.languages.insertBefore("haxe","class-name",{regex:{pattern:/~\/(?:[^\/\\\r\n]|\\.)+\/[a-z]*/,greedy:!0,inside:{"regex-flags":/\b[a-z]+$/,"regex-source":{pattern:/^(~\/)[\s\S]+(?=\/$)/,lookbehind:!0,alias:"language-regex",inside:Prism.languages.regex},"regex-delimiter":/^~\/|\/$/}}}),Prism.languages.insertBefore("haxe","keyword",{preprocessor:{pattern:/#(?:else|elseif|end|if)\b.*/,alias:"property"},metadata:{pattern:/@:?[\w.]+/,alias:"symbol"},reification:{pattern:/\$(?:\w+|(?=\{))/,alias:"important"}});