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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/brightscript.js +1

@@ -0,0 +1 @@
1 Prism.languages.brightscript={comment:/(?:\brem|').*/i,"directive-statement":{pattern:/(^[\t ]*)#(?:const|else(?:[\t ]+if)?|end[\t ]+if|error|if).*/im,lookbehind:!0,alias:"property",inside:{"error-message":{pattern:/(^#error).+/,lookbehind:!0},directive:{pattern:/^#(?:const|else(?:[\t ]+if)?|end[\t ]+if|error|if)/,alias:"keyword"},expression:{pattern:/[\s\S]+/,inside:null}}},property:{pattern:/([\r\n{,][\t ]*)(?:(?!\d)\w+|"(?:[^"\r\n]|"")*"(?!"))(?=[ \t]*:)/,lookbehind:!0,greedy:!0},string:{pattern:/"(?:[^"\r\n]|"")*"(?!")/,greedy:!0},"class-name":{pattern:/(\bAs[\t ]+)\w+/i,lookbehind:!0},keyword:/\b(?:As|Dim|Each|Else|Elseif|End|Exit|For|Function|Goto|If|In|Print|Return|Step|Stop|Sub|Then|To|While)\b/i,boolean:/\b(?:false|true)\b/i,function:/\b(?!\d)\w+(?=[\t ]*\()/,number:/(?:\b\d+(?:\.\d+)?(?:[ed][+-]\d+)?|&h[a-f\d]+)\b[%&!#]?/i,operator:/--|\+\+|>>=?|<<=?|<>|[-+*/\\<>]=?|[:^=?]|\b(?:and|mod|not|or)\b/i,punctuation:/[.,;()[\]{}]/,constant:/\b(?:LINE_NUM)\b/i},Prism.languages.brightscript["directive-statement"].inside.expression.inside=Prism.languages.brightscript;