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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/peoplecode.js +1

@@ -0,0 +1 @@
1 Prism.languages.peoplecode={comment:RegExp(["/\\*[^]*?\\*/","\\bREM[^;]*;","<\\*(?:[^<*]|\\*(?!>)|<(?!\\*)|<\\*(?:(?!\\*>)[^])*\\*>)*\\*>","/\\+[^]*?\\+/"].join("|")),string:{pattern:/'(?:''|[^'\r\n])*'(?!')|"(?:""|[^"\r\n])*"(?!")/,greedy:!0},variable:/%\w+/,"function-definition":{pattern:/((?:^|[^\w-])(?:function|method)\s+)\w+/i,lookbehind:!0,alias:"function"},"class-name":{pattern:/((?:^|[^-\w])(?:as|catch|class|component|create|extends|global|implements|instance|local|of|property|returns)\s+)\w+(?::\w+)*/i,lookbehind:!0,inside:{punctuation:/:/}},keyword:/\b(?:abstract|alias|as|catch|class|component|constant|create|declare|else|end-(?:class|evaluate|for|function|get|if|method|set|try|while)|evaluate|extends|for|function|get|global|if|implements|import|instance|library|local|method|null|of|out|peopleCode|private|program|property|protected|readonly|ref|repeat|returns?|set|step|then|throw|to|try|until|value|when(?:-other)?|while)\b/i,"operator-keyword":{pattern:/\b(?:and|not|or)\b/i,alias:"operator"},function:/[_a-z]\w*(?=\s*\()/i,boolean:/\b(?:false|true)\b/i,number:/\b\d+(?:\.\d+)?\b/,operator:/<>|[<>]=?|!=|\*\*|[-+*/|=@]/,punctuation:/[:.;,()[\]]/},Prism.languages.pcode=Prism.languages.peoplecode;