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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/fsharp.js +1
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| 1 | Prism.languages.fsharp=Prism.languages.extend("clike",{comment:[{pattern:/(^|[^\\])\(\*(?!\))[\s\S]*?\*\)/,lookbehind:!0,greedy:!0},{pattern:/(^|[^\\:])\/\/.*/,lookbehind:!0,greedy:!0}],string:{pattern:/(?:"""[\s\S]*?"""|@"(?:""|[^"])*"|"(?:\\[\s\S]|[^\\"])*")B?/,greedy:!0},"class-name":{pattern:/(\b(?:exception|inherit|interface|new|of|type)\s+|\w\s*:\s*|\s:\??>\s*)[.\w]+\b(?:\s*(?:->|\*)\s*[.\w]+\b)*(?!\s*[:.])/,lookbehind:!0,inside:{operator:/->|\*/,punctuation:/\./}},keyword:/\b(?:let|return|use|yield)(?:!\B|\b)|\b(?:abstract|and|as|asr|assert|atomic|base|begin|break|checked|class|component|const|constraint|constructor|continue|default|delegate|do|done|downcast|downto|eager|elif|else|end|event|exception|extern|external|false|finally|fixed|for|fun|function|functor|global|if|in|include|inherit|inline|interface|internal|land|lazy|lor|lsl|lsr|lxor|match|member|method|mixin|mod|module|mutable|namespace|new|not|null|object|of|open|or|override|parallel|private|process|protected|public|pure|rec|sealed|select|sig|static|struct|tailcall|then|to|trait|true|try|type|upcast|val|virtual|void|volatile|when|while|with)\b/,number:[/\b0x[\da-fA-F]+(?:LF|lf|un)?\b/,/\b0b[01]+(?:uy|y)?\b/,/(?:\b\d+(?:\.\d*)?|\B\.\d+)(?:[fm]|e[+-]?\d+)?\b/i,/\b\d+(?:[IlLsy]|UL|u[lsy]?)?\b/],operator:/([<>~&^])\1\1|([*.:<>&])\2|<-|->|[!=:]=|<?\|{1,3}>?|\??(?:<=|>=|<>|[-+*/%=<>])\??|[!?^&]|~[+~-]|:>|:\?>?/}),Prism.languages.insertBefore("fsharp","keyword",{preprocessor:{pattern:/(^[\t ]*)#.*/m,lookbehind:!0,alias:"property",inside:{directive:{pattern:/(^#)\b(?:else|endif|if|light|line|nowarn)\b/,lookbehind:!0,alias:"keyword"}}}}),Prism.languages.insertBefore("fsharp","punctuation",{"computation-expression":{pattern:/\b[_a-z]\w*(?=\s*\{)/i,alias:"keyword"}}),Prism.languages.insertBefore("fsharp","string",{annotation:{pattern:/\[<.+?>\]/,greedy:!0,inside:{punctuation:/^\[<|>\]$/,"class-name":{pattern:/^\w+$|(^|;\s*)[A-Z]\w*(?=\()/,lookbehind:!0},"annotation-content":{pattern:/[\s\S]+/,inside:Prism.languages.fsharp}}},char:{pattern:/'(?:[^\\']|\\(?:.|\d{3}|x[a-fA-F\d]{2}|u[a-fA-F\d]{4}|U[a-fA-F\d]{8}))'B?/,greedy:!0}}); | ||