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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/excel-formula.js +1

@@ -0,0 +1 @@
		1	Prism.languages["excel-formula"]={comment:{pattern:/(\bN$\s)"(?:[^"]\|"")"(?=\s$)/i,lookbehind:!0,greedy:!0},string:{pattern:/"(?:[^"]\|"")"(?!")/,greedy:!0},reference:{pattern:/(?:'[^']'\|(?:[^\s()[\]{}<>?"';,$&]\[[^^\s()[\]{}<>?"']+\])?\w+)!/,greedy:!0,alias:"string",inside:{operator:/!$/,punctuation:/'/,sheet:{pattern:/[^[\]]+$/,alias:"function"},file:{pattern:/\[[^[\]]+\]$/,inside:{punctuation:/[[\]]/}},path:/[\s\S]+/}},"function-name":{pattern:/\b[A-Z]\w(?=\()/i,alias:"builtin"},range:{pattern:/\$?\b(?:[A-Z]+\$?\d+:\$?[A-Z]+\$?\d+\|[A-Z]+:\$?[A-Z]+\|\d+:\$?\d+)\b/i,alias:"selector",inside:{operator:/:/,cell:/\$?[A-Z]+\$?\d+/i,column:/\$?[A-Z]+/i,row:/\$?\d+/}},cell:{pattern:/\b[A-Z]+\d+\b\|\$[A-Za-z]+\$?\d+\b\|\b[A-Za-z]+\$\d+\b/,alias:"selector"},number:/(?:\b\d+(?:\.\d+)?\|\B\.\d+)(?:e[+-]?\d+)?\b/i,boolean:/\b(?:FALSE\|TRUE)\b/i,operator:/[-+/^%=&,]\|<[=>]?\|>=?/,punctuation:/[[\]();{}\|]/},Prism.languages.xlsx=Prism.languages.xls=Prism.languages["excel-formula"];

@@ -0,0 +1 @@
		1	Prism.languages["excel-formula"]={comment:{pattern:/(\bN\(\s)"(?:[^"]\|"")"(?=\s\))/i,lookbehind:!0,greedy:!0},string:{pattern:/"(?:[^"]\|"")"(?!")/,greedy:!0},reference:{pattern:/(?:'[^']'\|(?:[^\s()[\]{}<>?"';,$&]\[[^^\s()[\]{}<>?"']+\])?\w+)!/,greedy:!0,alias:"string",inside:{operator:/!$/,punctuation:/'/,sheet:{pattern:/[^[\]]+$/,alias:"function"},file:{pattern:/\[[^[\]]+\]$/,inside:{punctuation:/[[\]]/}},path:/[\s\S]+/}},"function-name":{pattern:/\b[A-Z]\w(?=\()/i,alias:"builtin"},range:{pattern:/\$?\b(?:[A-Z]+\$?\d+:\$?[A-Z]+\$?\d+\|[A-Z]+:\$?[A-Z]+\|\d+:\$?\d+)\b/i,alias:"selector",inside:{operator:/:/,cell:/\$?[A-Z]+\$?\d+/i,column:/\$?[A-Z]+/i,row:/\$?\d+/}},cell:{pattern:/\b[A-Z]+\d+\b\|\$[A-Za-z]+\$?\d+\b\|\b[A-Za-z]+\$\d+\b/,alias:"selector"},number:/(?:\b\d+(?:\.\d+)?\|\B\.\d+)(?:e[+-]?\d+)?\b/i,boolean:/\b(?:FALSE\|TRUE)\b/i,operator:/[-+/^%=&,]\|<[=>]?\|>=?/,punctuation:/[[\]();{}\|]/},Prism.languages.xlsx=Prism.languages.xls=Prism.languages["excel-formula"];