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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/concurnas.js +1

@@ -0,0 +1 @@
1 Prism.languages.concurnas={comment:{pattern:/(^|[^\\])(?:\/\*[\s\S]*?(?:\*\/|$)|\/\/.*)/,lookbehind:!0,greedy:!0},langext:{pattern:/\b\w+\s*\|\|[\s\S]+?\|\|/,greedy:!0,inside:{"class-name":/^\w+/,string:{pattern:/(^\s*\|\|)[\s\S]+(?=\|\|$)/,lookbehind:!0},punctuation:/\|\|/}},function:{pattern:/((?:^|\s)def[ \t]+)[a-zA-Z_]\w*(?=\s*\()/,lookbehind:!0},keyword:/\b(?:abstract|actor|also|annotation|assert|async|await|bool|boolean|break|byte|case|catch|changed|char|class|closed|constant|continue|def|default|del|double|elif|else|enum|every|extends|false|finally|float|for|from|global|gpudef|gpukernel|if|import|in|init|inject|int|lambda|local|long|loop|match|new|nodefault|null|of|onchange|open|out|override|package|parfor|parforsync|post|pre|private|protected|provide|provider|public|return|shared|short|single|size_t|sizeof|super|sync|this|throw|trait|trans|transient|true|try|typedef|unchecked|using|val|var|void|while|with)\b/,boolean:/\b(?:false|true)\b/,number:/\b0b[01][01_]*L?\b|\b0x(?:[\da-f_]*\.)?[\da-f_p+-]+\b|(?:\b\d[\d_]*(?:\.[\d_]*)?|\B\.\d[\d_]*)(?:e[+-]?\d[\d_]*)?[dfls]?/i,punctuation:/[{}[\];(),.:]/,operator:/<==|>==|=>|->|<-|<>|&==|&<>|\?:?|\.\?|\+\+|--|[-+*/=<>]=?|[!^~]|\b(?:and|as|band|bor|bxor|comp|is|isnot|mod|or)\b=?/,annotation:{pattern:/@(?:\w+:)?(?:\w+|\[[^\]]+\])?/,alias:"builtin"}},Prism.languages.insertBefore("concurnas","langext",{"regex-literal":{pattern:/\br("|')(?:\\.|(?!\1)[^\\\r\n])*\1/,greedy:!0,inside:{interpolation:{pattern:/((?:^|[^\\])(?:\\{2})*)\{(?:[^{}]|\{(?:[^{}]|\{[^}]*\})*\})+\}/,lookbehind:!0,inside:Prism.languages.concurnas},regex:/[\s\S]+/}},"string-literal":{pattern:/(?:\B|\bs)("|')(?:\\.|(?!\1)[^\\\r\n])*\1/,greedy:!0,inside:{interpolation:{pattern:/((?:^|[^\\])(?:\\{2})*)\{(?:[^{}]|\{(?:[^{}]|\{[^}]*\})*\})+\}/,lookbehind:!0,inside:Prism.languages.concurnas},string:/[\s\S]+/}}}),Prism.languages.conc=Prism.languages.concurnas;