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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/smali.js +1

@@ -0,0 +1 @@
1 Prism.languages.smali={comment:/#.*/,string:{pattern:/"(?:[^\r\n\\"]|\\.)*"|'(?:[^\r\n\\']|\\(?:.|u[\da-fA-F]{4}))'/,greedy:!0},"class-name":{pattern:/(^|[^L])L(?:(?:\w+|`[^`\r\n]*`)\/)*(?:[\w$]+|`[^`\r\n]*`)(?=\s*;)/,lookbehind:!0,inside:{"class-name":{pattern:/(^L|\/)(?:[\w$]+|`[^`\r\n]*`)$/,lookbehind:!0},namespace:{pattern:/^(L)(?:(?:\w+|`[^`\r\n]*`)\/)+/,lookbehind:!0,inside:{punctuation:/\//}},builtin:/^L/}},builtin:[{pattern:/([();\[])[BCDFIJSVZ]+/,lookbehind:!0},{pattern:/([\w$>]:)[BCDFIJSVZ]/,lookbehind:!0}],keyword:[{pattern:/(\.end\s+)[\w-]+/,lookbehind:!0},{pattern:/(^|[^\w.-])\.(?!\d)[\w-]+/,lookbehind:!0},{pattern:/(^|[^\w.-])(?:abstract|annotation|bridge|constructor|enum|final|interface|private|protected|public|runtime|static|synthetic|system|transient)(?![\w.-])/,lookbehind:!0}],function:{pattern:/(^|[^\w.-])(?:\w+|<[\w$-]+>)(?=\()/,lookbehind:!0},field:{pattern:/[\w$]+(?=:)/,alias:"variable"},register:{pattern:/(^|[^\w.-])[vp]\d(?![\w.-])/,lookbehind:!0,alias:"variable"},boolean:{pattern:/(^|[^\w.-])(?:false|true)(?![\w.-])/,lookbehind:!0},number:{pattern:/(^|[^/\w.-])-?(?:NAN|INFINITY|0x(?:[\dA-F]+(?:\.[\dA-F]*)?|\.[\dA-F]+)(?:p[+-]?[\dA-F]+)?|(?:\d+(?:\.\d*)?|\.\d+)(?:e[+-]?\d+)?)[dflst]?(?![\w.-])/i,lookbehind:!0},label:{pattern:/(:)\w+/,lookbehind:!0,alias:"property"},operator:/->|\.\.|[\[=]/,punctuation:/[{}(),;:]/};