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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/cypher.js +1

@@ -0,0 +1 @@
1 Prism.languages.cypher={comment:/\/\/.*/,string:{pattern:/"(?:[^"\\\r\n]|\\.)*"|'(?:[^'\\\r\n]|\\.)*'/,greedy:!0},"class-name":{pattern:/(:\s*)(?:\w+|`(?:[^`\\\r\n])*`)(?=\s*[{):])/,lookbehind:!0,greedy:!0},relationship:{pattern:/(-\[\s*(?:\w+\s*|`(?:[^`\\\r\n])*`\s*)?:\s*|\|\s*:\s*)(?:\w+|`(?:[^`\\\r\n])*`)/,lookbehind:!0,greedy:!0,alias:"property"},identifier:{pattern:/`(?:[^`\\\r\n])*`/,greedy:!0},variable:/\$\w+/,keyword:/\b(?:ADD|ALL|AND|AS|ASC|ASCENDING|ASSERT|BY|CALL|CASE|COMMIT|CONSTRAINT|CONTAINS|CREATE|CSV|DELETE|DESC|DESCENDING|DETACH|DISTINCT|DO|DROP|ELSE|END|ENDS|EXISTS|FOR|FOREACH|IN|INDEX|IS|JOIN|KEY|LIMIT|LOAD|MANDATORY|MATCH|MERGE|NODE|NOT|OF|ON|OPTIONAL|OR|ORDER(?=\s+BY)|PERIODIC|REMOVE|REQUIRE|RETURN|SCALAR|SCAN|SET|SKIP|START|STARTS|THEN|UNION|UNIQUE|UNWIND|USING|WHEN|WHERE|WITH|XOR|YIELD)\b/i,function:/\b\w+\b(?=\s*\()/,boolean:/\b(?:false|null|true)\b/i,number:/\b(?:0x[\da-fA-F]+|\d+(?:\.\d+)?(?:[eE][+-]?\d+)?)\b/,operator:/:|<--?|--?>?|<>|=~?|[<>]=?|[+*/%^|]|\.\.\.?/,punctuation:/[()[\]{},;.]/};