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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/javastacktrace.js +1

@@ -0,0 +1 @@
1 Prism.languages.javastacktrace={summary:{pattern:/^([\t ]*)(?:(?:Caused by:|Suppressed:|Exception in thread "[^"]*")[\t ]+)?[\w$.]+(?::.*)?$/m,lookbehind:!0,inside:{keyword:{pattern:/^([\t ]*)(?:(?:Caused by|Suppressed)(?=:)|Exception in thread)/m,lookbehind:!0},string:{pattern:/^(\s*)"[^"]*"/,lookbehind:!0},exceptions:{pattern:/^(:?\s*)[\w$.]+(?=:|$)/,lookbehind:!0,inside:{"class-name":/[\w$]+$/,namespace:/\b[a-z]\w*\b/,punctuation:/\./}},message:{pattern:/(:\s*)\S.*/,lookbehind:!0,alias:"string"},punctuation:/:/}},"stack-frame":{pattern:/^([\t ]*)at (?:[\w$./]|@[\w$.+-]*\/)+(?:<init>)?\([^()]*\)/m,lookbehind:!0,inside:{keyword:{pattern:/^(\s*)at(?= )/,lookbehind:!0},source:[{pattern:/(\()\w+\.\w+:\d+(?=\))/,lookbehind:!0,inside:{file:/^\w+\.\w+/,punctuation:/:/,"line-number":{pattern:/\b\d+\b/,alias:"number"}}},{pattern:/(\()[^()]*(?=\))/,lookbehind:!0,inside:{keyword:/^(?:Native Method|Unknown Source)$/}}],"class-name":/[\w$]+(?=\.(?:<init>|[\w$]+)\()/,function:/(?:<init>|[\w$]+)(?=\()/,"class-loader":{pattern:/(\s)[a-z]\w*(?:\.[a-z]\w*)*(?=\/[\w@$.]*\/)/,lookbehind:!0,alias:"namespace",inside:{punctuation:/\./}},module:{pattern:/([\s/])[a-z]\w*(?:\.[a-z]\w*)*(?:@[\w$.+-]*)?(?=\/)/,lookbehind:!0,inside:{version:{pattern:/(@)[\s\S]+/,lookbehind:!0,alias:"number"},punctuation:/[@.]/}},namespace:{pattern:/(?:\b[a-z]\w*\.)+/,inside:{punctuation:/\./}},punctuation:/[()/.]/}},more:{pattern:/^([\t ]*)\.{3} \d+ [a-z]+(?: [a-z]+)*/m,lookbehind:!0,inside:{punctuation:/\.{3}/,number:/\d+/,keyword:/\b[a-z]+(?: [a-z]+)*\b/}}};