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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/latex.js +1

@@ -0,0 +1 @@
		1	!function(a){var e=/\$?:[^a-z()[\]]\|[a-z]+)/i,n={"equation-command":{pattern:e,alias:"regex"}};a.languages.latex={comment:/%./,cdata:{pattern:/(\\begin\{((?:lstlisting\|verbatim)\?)\})[\s\S]?(?=\\end\{\2\})/,lookbehind:!0},equation:[{pattern:/\$\$(?:\\[\s\S]\|[^\\$])+\$\$\|\$(?:\\[\s\S]\|[^\\$])+\$\|\\\([\s\S]?\\$\|\\\[[\s\S]?\\\]/,inside:n,alias:"string"},{pattern:/(\\begin\{((?:align\|eqnarray\|equation\|gather\|math\|multline)\?)\})[\s\S]?(?=\\end\{\2\})/,lookbehind:!0,inside:n,alias:"string"}],keyword:{pattern:/(\\(?:begin\|cite\|documentclass\|end\|label\|ref\|usepackage)(?:\[[^\]]+\])?\{)[^}]+(?=\})/,lookbehind:!0},url:{pattern:/(\\url\{)[^}]+(?=\})/,lookbehind:!0},headline:{pattern:/(\\(?:chapter\|frametitle\|paragraph\|part\|section\|subparagraph\|subsection\|subsubparagraph\|subsubsection\|subsubsubparagraph)\*?(?:\[[^\]]+\])?\{)[^}]+(?=\})/,lookbehind:!0,alias:"class-name"},function:{pattern:e,alias:"selector"},punctuation:/[[\]{}&]/},a.languages.tex=a.languages.latex,a.languages.context=a.languages.latex}(Prism);

@@ -0,0 +1 @@
		1	!function(a){var e=/\\(?:[^a-z()[\]]\|[a-z]+)/i,n={"equation-command":{pattern:e,alias:"regex"}};a.languages.latex={comment:/%./,cdata:{pattern:/(\\begin\{((?:lstlisting\|verbatim)\?)\})[\s\S]?(?=\\end\{\2\})/,lookbehind:!0},equation:[{pattern:/\$\$(?:\\[\s\S]\|[^\\$])+\$\$\|\$(?:\\[\s\S]\|[^\\$])+\$\|\\\([\s\S]?\\\)\|\\\[[\s\S]?\\\]/,inside:n,alias:"string"},{pattern:/(\\begin\{((?:align\|eqnarray\|equation\|gather\|math\|multline)\?)\})[\s\S]?(?=\\end\{\2\})/,lookbehind:!0,inside:n,alias:"string"}],keyword:{pattern:/(\\(?:begin\|cite\|documentclass\|end\|label\|ref\|usepackage)(?:\[[^\]]+\])?\{)[^}]+(?=\})/,lookbehind:!0},url:{pattern:/(\\url\{)[^}]+(?=\})/,lookbehind:!0},headline:{pattern:/(\\(?:chapter\|frametitle\|paragraph\|part\|section\|subparagraph\|subsection\|subsubparagraph\|subsubsection\|subsubsubparagraph)\*?(?:\[[^\]]+\])?\{)[^}]+(?=\})/,lookbehind:!0,alias:"class-name"},function:{pattern:e,alias:"selector"},punctuation:/[[\]{}&]/},a.languages.tex=a.languages.latex,a.languages.context=a.languages.latex}(Prism);