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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/jq.js +1

@@ -0,0 +1 @@
		1	!function(e){var n="\\\\\$(?:[^()]\|\\([^()]\$)\\)",t=RegExp('(^\|[^\\\\])"(?:[^"\r\n\\\\]\|\\\\[^\r\n(]\|__)"'.replace(/__/g,(function(){return n}))),i={interpolation:{pattern:RegExp("((?:^\|[^\\\\])(?:\\\\{2}))"+n),lookbehind:!0,inside:{content:{pattern:/^(\\$)[\s\S]+(?=$$)/,lookbehind:!0,inside:null},punctuation:/^\\$\|$$/}}},a=e.languages.jq={comment:/#./,property:{pattern:RegExp(t.source+"(?=\\s:(?!:))"),lookbehind:!0,greedy:!0,inside:i},string:{pattern:t,lookbehind:!0,greedy:!0,inside:i},function:{pattern:/(\bdef\s+)[a-z_]\w+/i,lookbehind:!0},variable:/\B\$\w+/,"property-literal":{pattern:/\b[a-z_]\w(?=\s:(?!:))/i,alias:"property"},keyword:/\b(?:as\|break\|catch\|def\|elif\|else\|end\|foreach\|if\|import\|include\|label\|module\|modulemeta\|null\|reduce\|then\|try\|while)\b/,boolean:/\b(?:false\|true)\b/,number:/(?:\b\d+\.\|\B\.)?\b\d+(?:[eE][+-]?\d+)?\b/,operator:[{pattern:/\\|=?/,alias:"pipe"},/\.\.\|[!=<>]?=\|\?\/\/\|\/\/=?\|[-+/%]=?\|[<>?]\|\b(?:and\|not\|or)\b/],"c-style-function":{pattern:/\b[a-z_]\w(?=\s\()/i,alias:"function"},punctuation:/::\|[()\[\]{},:;]\|\.(?=\s[\[\w$])/,dot:{pattern:/\./,alias:"important"}};i.interpolation.inside.content.inside=a}(Prism);

@@ -0,0 +1 @@
		1	!function(e){var n="\\\\\\((?:[^()]\|\\([^()]\\))\\)",t=RegExp('(^\|[^\\\\])"(?:[^"\r\n\\\\]\|\\\\[^\r\n(]\|__)"'.replace(/__/g,(function(){return n}))),i={interpolation:{pattern:RegExp("((?:^\|[^\\\\])(?:\\\\{2}))"+n),lookbehind:!0,inside:{content:{pattern:/^(\\\()[\s\S]+(?=\)$)/,lookbehind:!0,inside:null},punctuation:/^\\\(\|\)$/}}},a=e.languages.jq={comment:/#./,property:{pattern:RegExp(t.source+"(?=\\s:(?!:))"),lookbehind:!0,greedy:!0,inside:i},string:{pattern:t,lookbehind:!0,greedy:!0,inside:i},function:{pattern:/(\bdef\s+)[a-z_]\w+/i,lookbehind:!0},variable:/\B\$\w+/,"property-literal":{pattern:/\b[a-z_]\w(?=\s:(?!:))/i,alias:"property"},keyword:/\b(?:as\|break\|catch\|def\|elif\|else\|end\|foreach\|if\|import\|include\|label\|module\|modulemeta\|null\|reduce\|then\|try\|while)\b/,boolean:/\b(?:false\|true)\b/,number:/(?:\b\d+\.\|\B\.)?\b\d+(?:[eE][+-]?\d+)?\b/,operator:[{pattern:/\\|=?/,alias:"pipe"},/\.\.\|[!=<>]?=\|\?\/\/\|\/\/=?\|[-+/%]=?\|[<>?]\|\b(?:and\|not\|or)\b/],"c-style-function":{pattern:/\b[a-z_]\w(?=\s\()/i,alias:"function"},punctuation:/::\|[()\[\]{},:;]\|\.(?=\s[\[\w$])/,dot:{pattern:/\./,alias:"important"}};i.interpolation.inside.content.inside=a}(Prism);