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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/gap.js +1

@@ -0,0 +1 @@
1 Prism.languages.gap={shell:{pattern:/^gap>[\s\S]*?(?=^gap>|$(?![\s\S]))/m,greedy:!0,inside:{gap:{pattern:/^(gap>).+(?:(?:\r(?:\n|(?!\n))|\n)>.*)*/,lookbehind:!0,inside:null},punctuation:/^gap>/}},comment:{pattern:/#.*/,greedy:!0},string:{pattern:/(^|[^\\'"])(?:'(?:[^\r\n\\']|\\.){1,10}'|"(?:[^\r\n\\"]|\\.)*"(?!")|"""[\s\S]*?""")/,lookbehind:!0,greedy:!0,inside:{continuation:{pattern:/([\r\n])>/,lookbehind:!0,alias:"punctuation"}}},keyword:/\b(?:Assert|Info|IsBound|QUIT|TryNextMethod|Unbind|and|atomic|break|continue|do|elif|else|end|fi|for|function|if|in|local|mod|not|od|or|quit|readonly|readwrite|rec|repeat|return|then|until|while)\b/,boolean:/\b(?:false|true)\b/,function:/\b[a-z_]\w*(?=\s*\()/i,number:{pattern:/(^|[^\w.]|\.\.)(?:\d+(?:\.\d*)?|\.\d+)(?:[eE][+-]?\d+)?(?:_[a-z]?)?(?=$|[^\w.]|\.\.)/,lookbehind:!0},continuation:{pattern:/([\r\n])>/,lookbehind:!0,alias:"punctuation"},operator:/->|[-+*/^~=!]|<>|[<>]=?|:=|\.\./,punctuation:/[()[\]{},;.:]/},Prism.languages.gap.shell.inside.gap.inside=Prism.languages.gap;