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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/batch.js +1

@@ -0,0 +1 @@
1 !function(e){var r=/%%?[~:\w]+%?|!\S+!/,t={pattern:/\/[a-z?]+(?=[ :]|$):?|-[a-z]\b|--[a-z-]+\b/im,alias:"attr-name",inside:{punctuation:/:/}},n=/"(?:[\\"]"|[^"])*"(?!")/,i=/(?:\b|-)\d+\b/;e.languages.batch={comment:[/^::.*/m,{pattern:/((?:^|[&(])[ \t]*)rem\b(?:[^^&)\r\n]|\^(?:\r\n|[\s\S]))*/im,lookbehind:!0}],label:{pattern:/^:.*/m,alias:"property"},command:[{pattern:/((?:^|[&(])[ \t]*)for(?: \/[a-z?](?:[ :](?:"[^"]*"|[^\s"/]\S*))?)* \S+ in \([^)]+\) do/im,lookbehind:!0,inside:{keyword:/\b(?:do|in)\b|^for\b/i,string:n,parameter:t,variable:r,number:i,punctuation:/[()',]/}},{pattern:/((?:^|[&(])[ \t]*)if(?: \/[a-z?](?:[ :](?:"[^"]*"|[^\s"/]\S*))?)* (?:not )?(?:cmdextversion \d+|defined \w+|errorlevel \d+|exist \S+|(?:"[^"]*"|(?!")(?:(?!==)\S)+)?(?:==| (?:equ|geq|gtr|leq|lss|neq) )(?:"[^"]*"|[^\s"]\S*))/im,lookbehind:!0,inside:{keyword:/\b(?:cmdextversion|defined|errorlevel|exist|not)\b|^if\b/i,string:n,parameter:t,variable:r,number:i,operator:/\^|==|\b(?:equ|geq|gtr|leq|lss|neq)\b/i}},{pattern:/((?:^|[&()])[ \t]*)else\b/im,lookbehind:!0,inside:{keyword:/^else\b/i}},{pattern:/((?:^|[&(])[ \t]*)set(?: \/[a-z](?:[ :](?:"[^"]*"|[^\s"/]\S*))?)* (?:[^^&)\r\n]|\^(?:\r\n|[\s\S]))*/im,lookbehind:!0,inside:{keyword:/^set\b/i,string:n,parameter:t,variable:[r,/\w+(?=(?:[*\/%+\-&^|]|<<|>>)?=)/],number:i,operator:/[*\/%+\-&^|]=?|<<=?|>>=?|[!~_=]/,punctuation:/[()',]/}},{pattern:/((?:^|[&(])[ \t]*@?)\w+\b(?:"(?:[\\"]"|[^"])*"(?!")|[^"^&)\r\n]|\^(?:\r\n|[\s\S]))*/m,lookbehind:!0,inside:{keyword:/^\w+\b/,string:n,parameter:t,label:{pattern:/(^\s*):\S+/m,lookbehind:!0,alias:"property"},variable:r,number:i,operator:/\^/}}],operator:/[&@]/,punctuation:/[()']/}}(Prism);