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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/cue.js +1

@@ -0,0 +1 @@
1 !function(e){var n="(?:"+"\"\"\"(?:[^\\\\\"]|\"(?!\"\"\\2)|<esc>)*\"\"\"|'''(?:[^\\\\']|'(?!''\\2)|<esc>)*'''|\"(?:[^\\\\\r\n\"]|\"(?!\\2)|<esc>)*\"|'(?:[^\\\\\r\n']|'(?!\\2)|<esc>)*'".replace(/<esc>/g,"\\\\(?:(?!\\2)|\\2(?:[^()\r\n]|\\([^()]*\\)))")+")";e.languages.cue={comment:{pattern:/\/\/.*/,greedy:!0},"string-literal":{pattern:RegExp("(^|[^#\"'\\\\])(#*)"+n+"(?![\"'])\\2"),lookbehind:!0,greedy:!0,inside:{escape:{pattern:/(?=[\s\S]*["'](#*)$)\\\1(?:U[a-fA-F0-9]{1,8}|u[a-fA-F0-9]{1,4}|x[a-fA-F0-9]{1,2}|\d{2,3}|[^(])/,greedy:!0,alias:"string"},interpolation:{pattern:/(?=[\s\S]*["'](#*)$)\\\1\([^()]*\)/,greedy:!0,inside:{punctuation:/^\\#*\(|\)$/,expression:{pattern:/[\s\S]+/,inside:null}}},string:/[\s\S]+/}},keyword:{pattern:/(^|[^\w$])(?:for|if|import|in|let|null|package)(?![\w$])/,lookbehind:!0},boolean:{pattern:/(^|[^\w$])(?:false|true)(?![\w$])/,lookbehind:!0},builtin:{pattern:/(^|[^\w$])(?:bool|bytes|float|float(?:32|64)|u?int(?:8|16|32|64|128)?|number|rune|string)(?![\w$])/,lookbehind:!0},attribute:{pattern:/@[\w$]+(?=\s*\()/,alias:"function"},function:{pattern:/(^|[^\w$])[a-z_$][\w$]*(?=\s*\()/i,lookbehind:!0},number:{pattern:/(^|[^\w$.])(?:0b[01]+(?:_[01]+)*|0o[0-7]+(?:_[0-7]+)*|0[xX][0-9A-Fa-f]+(?:_[0-9A-Fa-f]+)*|(?:\d+(?:_\d+)*(?:\.(?:\d+(?:_\d+)*)?)?|\.\d+(?:_\d+)*)(?:[eE][+-]?\d+(?:_\d+)*)?(?:[KMGTP]i?)?)(?![\w$])/,lookbehind:!0},operator:/\.{3}|_\|_|&&?|\|\|?|[=!]~|[<>=!]=?|[+\-*/?]/,punctuation:/[()[\]{},.:]/},e.languages.cue["string-literal"].inside.interpolation.inside.expression.inside=e.languages.cue}(Prism);