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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/aql.js +1

@@ -0,0 +1 @@
1 Prism.languages.aql={comment:/\/\/.*|\/\*[\s\S]*?\*\//,property:{pattern:/([{,]\s*)(?:(?!\d)\w+|(["'´`])(?:(?!\2)[^\\\r\n]|\\.)*\2)(?=\s*:)/,lookbehind:!0,greedy:!0},string:{pattern:/(["'])(?:(?!\1)[^\\\r\n]|\\.)*\1/,greedy:!0},identifier:{pattern:/([´`])(?:(?!\1)[^\\\r\n]|\\.)*\1/,greedy:!0},variable:/@@?\w+/,keyword:[{pattern:/(\bWITH\s+)COUNT(?=\s+INTO\b)/i,lookbehind:!0},/\b(?:AGGREGATE|ALL|AND|ANY|ASC|COLLECT|DESC|DISTINCT|FILTER|FOR|GRAPH|IN|INBOUND|INSERT|INTO|K_PATHS|K_SHORTEST_PATHS|LET|LIKE|LIMIT|NONE|NOT|NULL|OR|OUTBOUND|REMOVE|REPLACE|RETURN|SHORTEST_PATH|SORT|UPDATE|UPSERT|WINDOW|WITH)\b/i,{pattern:/(^|[^\w.[])(?:KEEP|PRUNE|SEARCH|TO)\b/i,lookbehind:!0},{pattern:/(^|[^\w.[])(?:CURRENT|NEW|OLD)\b/,lookbehind:!0},{pattern:/\bOPTIONS(?=\s*\{)/i}],function:/\b(?!\d)\w+(?=\s*\()/,boolean:/\b(?:false|true)\b/i,range:{pattern:/\.\./,alias:"operator"},number:[/\b0b[01]+/i,/\b0x[0-9a-f]+/i,/(?:\B\.\d+|\b(?:0|[1-9]\d*)(?:\.\d+)?)(?:e[+-]?\d+)?/i],operator:/\*{2,}|[=!]~|[!=<>]=?|&&|\|\||[-+*/%]/,punctuation:/::|[?.:,;()[\]{}]/};