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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/bro.js +1

@@ -0,0 +1 @@
1 Prism.languages.bro={comment:{pattern:/(^|[^\\$])#.*/,lookbehind:!0,inside:{italic:/\b(?:FIXME|TODO|XXX)\b/}},string:{pattern:/(["'])(?:\\(?:\r\n|[\s\S])|(?!\1)[^\\\r\n])*\1/,greedy:!0},boolean:/\b[TF]\b/,function:{pattern:/(\b(?:event|function|hook)[ \t]+)\w+(?:::\w+)?/,lookbehind:!0},builtin:/(?:@(?:load(?:-(?:plugin|sigs))?|unload|prefixes|ifn?def|else|(?:end)?if|DIR|FILENAME))|(?:&?(?:add_func|create_expire|default|delete_func|encrypt|error_handler|expire_func|group|log|mergeable|optional|persistent|priority|raw_output|read_expire|redef|rotate_interval|rotate_size|synchronized|type_column|write_expire))/,constant:{pattern:/(\bconst[ \t]+)\w+/i,lookbehind:!0},keyword:/\b(?:add|addr|alarm|any|bool|break|const|continue|count|delete|double|else|enum|event|export|file|for|function|global|hook|if|in|int|interval|local|module|next|of|opaque|pattern|port|print|record|return|schedule|set|string|subnet|table|time|timeout|using|vector|when)\b/,operator:/--?|\+\+?|!=?=?|<=?|>=?|==?=?|&&|\|\|?|\?|\*|\/|~|\^|%/,number:/\b0x[\da-f]+\b|(?:\b\d+(?:\.\d*)?|\B\.\d+)(?:e[+-]?\d+)?/i,punctuation:/[{}[\];(),.:]/};