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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/gn.js +1

@@ -0,0 +1 @@
1 Prism.languages.gn={comment:{pattern:/#.*/,greedy:!0},"string-literal":{pattern:/(^|[^\\"])"(?:[^\r\n"\\]|\\.)*"/,lookbehind:!0,greedy:!0,inside:{interpolation:{pattern:/((?:^|[^\\])(?:\\{2})*)\$(?:\{[\s\S]*?\}|[a-zA-Z_]\w*|0x[a-fA-F0-9]{2})/,lookbehind:!0,inside:{number:/^\$0x[\s\S]{2}$/,variable:/^\$\w+$/,"interpolation-punctuation":{pattern:/^\$\{|\}$/,alias:"punctuation"},expression:{pattern:/[\s\S]+/,inside:null}}},string:/[\s\S]+/}},keyword:/\b(?:else|if)\b/,boolean:/\b(?:false|true)\b/,"builtin-function":{pattern:/\b(?:assert|defined|foreach|import|pool|print|template|tool|toolchain)(?=\s*\()/i,alias:"keyword"},function:/\b[a-z_]\w*(?=\s*\()/i,constant:/\b(?:current_cpu|current_os|current_toolchain|default_toolchain|host_cpu|host_os|root_build_dir|root_gen_dir|root_out_dir|target_cpu|target_gen_dir|target_os|target_out_dir)\b/,number:/-?\b\d+\b/,operator:/[-+!=<>]=?|&&|\|\|/,punctuation:/[(){}[\],.]/},Prism.languages.gn["string-literal"].inside.interpolation.inside.expression.inside=Prism.languages.gn,Prism.languages.gni=Prism.languages.gn;