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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/neon.js +1

@@ -0,0 +1 @@
1 Prism.languages.neon={comment:{pattern:/#.*/,greedy:!0},datetime:{pattern:/(^|[[{(=:,\s])\d\d\d\d-\d\d?-\d\d?(?:(?:[Tt]| +)\d\d?:\d\d:\d\d(?:\.\d*)? *(?:Z|[-+]\d\d?(?::?\d\d)?)?)?(?=$|[\]}),\s])/,lookbehind:!0,alias:"number"},key:{pattern:/(^|[[{(,\s])[^,:=[\]{}()'"\s]+(?=\s*:(?:$|[\]}),\s])|\s*=)/,lookbehind:!0,alias:"property"},number:{pattern:/(^|[[{(=:,\s])[+-]?(?:0x[\da-fA-F]+|0o[0-7]+|0b[01]+|(?:\d+(?:\.\d*)?|\.?\d+)(?:[eE][+-]?\d+)?)(?=$|[\]}),:=\s])/,lookbehind:!0},boolean:{pattern:/(^|[[{(=:,\s])(?:false|no|true|yes)(?=$|[\]}),:=\s])/i,lookbehind:!0},null:{pattern:/(^|[[{(=:,\s])(?:null)(?=$|[\]}),:=\s])/i,lookbehind:!0,alias:"keyword"},string:{pattern:/(^|[[{(=:,\s])(?:('''|""")\r?\n(?:(?:[^\r\n]|\r?\n(?![\t ]*\2))*\r?\n)?[\t ]*\2|'[^'\r\n]*'|"(?:\\.|[^\\"\r\n])*")/,lookbehind:!0,greedy:!0},literal:{pattern:/(^|[[{(=:,\s])(?:[^#"',:=[\]{}()\s`-]|[:-][^"',=[\]{}()\s])(?:[^,:=\]})(\s]|:(?![\s,\]})]|$)|[ \t]+[^#,:=\]})(\s])*/,lookbehind:!0,alias:"string"},punctuation:/[,:=[\]{}()-]/};