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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/eiffel.js +1

@@ -0,0 +1 @@
1 Prism.languages.eiffel={comment:/--.*/,string:[{pattern:/"([^[]*)\[[\s\S]*?\]\1"/,greedy:!0},{pattern:/"([^{]*)\{[\s\S]*?\}\1"/,greedy:!0},{pattern:/"(?:%(?:(?!\n)\s)*\n\s*%|%\S|[^%"\r\n])*"/,greedy:!0}],char:/'(?:%.|[^%'\r\n])+'/,keyword:/\b(?:across|agent|alias|all|and|as|assign|attached|attribute|check|class|convert|create|Current|debug|deferred|detachable|do|else|elseif|end|ensure|expanded|export|external|feature|from|frozen|if|implies|inherit|inspect|invariant|like|local|loop|not|note|obsolete|old|once|or|Precursor|redefine|rename|require|rescue|Result|retry|select|separate|some|then|undefine|until|variant|Void|when|xor)\b/i,boolean:/\b(?:False|True)\b/i,"class-name":/\b[A-Z][\dA-Z_]*\b/,number:[/\b0[xcb][\da-f](?:_*[\da-f])*\b/i,/(?:\b\d(?:_*\d)*)?\.(?:(?:\d(?:_*\d)*)?e[+-]?)?\d(?:_*\d)*\b|\b\d(?:_*\d)*\b\.?/i],punctuation:/:=|<<|>>|\(\||\|\)|->|\.(?=\w)|[{}[\];(),:?]/,operator:/\\\\|\|\.\.\||\.\.|\/[~\/=]?|[><]=?|[-+*^=~]/};