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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/dot.js +1

@@ -0,0 +1 @@
1 !function(e){var a="(?:"+["[a-zA-Z_\\x80-\\uFFFF][\\w\\x80-\\uFFFF]*","-?(?:\\.\\d+|\\d+(?:\\.\\d*)?)",'"[^"\\\\]*(?:\\\\[^][^"\\\\]*)*"',"<(?:[^<>]|(?!\x3c!--)<(?:[^<>\"']|\"[^\"]*\"|'[^']*')+>|\x3c!--(?:[^-]|-(?!->))*--\x3e)*>"].join("|")+")",n={markup:{pattern:/(^<)[\s\S]+(?=>$)/,lookbehind:!0,alias:["language-markup","language-html","language-xml"],inside:e.languages.markup}};function r(e,n){return RegExp(e.replace(/<ID>/g,(function(){return a})),n)}e.languages.dot={comment:{pattern:/\/\/.*|\/\*[\s\S]*?\*\/|^#.*/m,greedy:!0},"graph-name":{pattern:r("(\\b(?:digraph|graph|subgraph)[ \t\r\n]+)<ID>","i"),lookbehind:!0,greedy:!0,alias:"class-name",inside:n},"attr-value":{pattern:r("(=[ \t\r\n]*)<ID>"),lookbehind:!0,greedy:!0,inside:n},"attr-name":{pattern:r("([\\[;, \t\r\n])<ID>(?=[ \t\r\n]*=)"),lookbehind:!0,greedy:!0,inside:n},keyword:/\b(?:digraph|edge|graph|node|strict|subgraph)\b/i,"compass-point":{pattern:/(:[ \t\r\n]*)(?:[ewc_]|[ns][ew]?)(?![\w\x80-\uFFFF])/,lookbehind:!0,alias:"builtin"},node:{pattern:r("(^|[^-.\\w\\x80-\\uFFFF\\\\])<ID>"),lookbehind:!0,greedy:!0,inside:n},operator:/[=:]|-[->]/,punctuation:/[\[\]{};,]/},e.languages.gv=e.languages.dot}(Prism);