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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/xeora.js +1

@@ -0,0 +1 @@
1 !function(n){n.languages.xeora=n.languages.extend("markup",{constant:{pattern:/\$(?:DomainContents|PageRenderDuration)\$/,inside:{punctuation:{pattern:/\$/}}},variable:{pattern:/\$@?(?:#+|[-+*~=^])?[\w.]+\$/,inside:{punctuation:{pattern:/[$.]/},operator:{pattern:/#+|[-+*~=^@]/}}},"function-inline":{pattern:/\$F:[-\w.]+\?[-\w.]+(?:,(?:(?:@[-#]*\w+\.[\w+.]\.*)*\|)*(?:(?:[\w+]|[-#*.~^]+[\w+]|=\S)(?:[^$=]|=+[^=])*=*|(?:@[-#]*\w+\.[\w+.]\.*)+(?:(?:[\w+]|[-#*~^][-#*.~^]*[\w+]|=\S)(?:[^$=]|=+[^=])*=*)?)?)?\$/,inside:{variable:{pattern:/(?:[,|])@?(?:#+|[-+*~=^])?[\w.]+/,inside:{punctuation:{pattern:/[,.|]/},operator:{pattern:/#+|[-+*~=^@]/}}},punctuation:{pattern:/\$\w:|[$:?.,|]/}},alias:"function"},"function-block":{pattern:/\$XF:\{[-\w.]+\?[-\w.]+(?:,(?:(?:@[-#]*\w+\.[\w+.]\.*)*\|)*(?:(?:[\w+]|[-#*.~^]+[\w+]|=\S)(?:[^$=]|=+[^=])*=*|(?:@[-#]*\w+\.[\w+.]\.*)+(?:(?:[\w+]|[-#*~^][-#*.~^]*[\w+]|=\S)(?:[^$=]|=+[^=])*=*)?)?)?\}:XF\$/,inside:{punctuation:{pattern:/[$:{}?.,|]/}},alias:"function"},"directive-inline":{pattern:/\$\w(?:#\d+\+?)?(?:\[[-\w.]+\])?:[-\/\w.]+\$/,inside:{punctuation:{pattern:/\$(?:\w:|C(?:\[|#\d))?|[:{[\]]/,inside:{tag:{pattern:/#\d/}}}},alias:"function"},"directive-block-open":{pattern:/\$\w+:\{|\$\w(?:#\d+\+?)?(?:\[[-\w.]+\])?:[-\w.]+:\{(?:![A-Z]+)?/,inside:{punctuation:{pattern:/\$(?:\w:|C(?:\[|#\d))?|[:{[\]]/,inside:{tag:{pattern:/#\d/}}},attribute:{pattern:/![A-Z]+$/,inside:{punctuation:{pattern:/!/}},alias:"keyword"}},alias:"function"},"directive-block-separator":{pattern:/\}:[-\w.]+:\{/,inside:{punctuation:{pattern:/[:{}]/}},alias:"function"},"directive-block-close":{pattern:/\}:[-\w.]+\$/,inside:{punctuation:{pattern:/[:{}$]/}},alias:"function"}}),n.languages.insertBefore("inside","punctuation",{variable:n.languages.xeora["function-inline"].inside.variable},n.languages.xeora["function-block"]),n.languages.xeoracube=n.languages.xeora}(Prism);