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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/sml.js +1

@@ -0,0 +1 @@
1 !function(e){var n=/\b(?:abstype|and|andalso|as|case|datatype|do|else|end|eqtype|exception|fn|fun|functor|handle|if|in|include|infix|infixr|let|local|nonfix|of|op|open|orelse|raise|rec|sharing|sig|signature|struct|structure|then|type|val|where|while|with|withtype)\b/i;e.languages.sml={comment:/\(\*(?:[^*(]|\*(?!\))|\((?!\*)|\(\*(?:[^*(]|\*(?!\))|\((?!\*))*\*\))*\*\)/,string:{pattern:/#?"(?:[^"\\]|\\.)*"/,greedy:!0},"class-name":[{pattern:RegExp("((?:^|[^:]):\\s*)<TERMINAL>(?:\\s*(?:(?:\\*|->)\\s*<TERMINAL>|,\\s*<TERMINAL>(?:(?=<NOT-LAST>)|(?!<NOT-LAST>)\\s+<LONG-ID>)))*".replace(/<NOT-LAST>/g,(function(){return"\\s*(?:[*,]|->)"})).replace(/<TERMINAL>/g,(function(){return"(?:'[\\w']*|<LONG-ID>|\\((?:[^()]|\\([^()]*\\))*\\)|\\{(?:[^{}]|\\{[^{}]*\\})*\\})(?:\\s+<LONG-ID>)*"})).replace(/<LONG-ID>/g,(function(){return"(?!<KEYWORD>)[a-z\\d_][\\w'.]*"})).replace(/<KEYWORD>/g,(function(){return n.source})),"i"),lookbehind:!0,greedy:!0,inside:null},{pattern:/((?:^|[^\w'])(?:datatype|exception|functor|signature|structure|type)\s+)[a-z_][\w'.]*/i,lookbehind:!0}],function:{pattern:/((?:^|[^\w'])fun\s+)[a-z_][\w'.]*/i,lookbehind:!0},keyword:n,variable:{pattern:/(^|[^\w'])'[\w']*/,lookbehind:!0},number:/~?\b(?:\d+(?:\.\d+)?(?:e~?\d+)?|0x[\da-f]+)\b/i,word:{pattern:/\b0w(?:\d+|x[\da-f]+)\b/i,alias:"constant"},boolean:/\b(?:false|true)\b/i,operator:/\.\.\.|:[>=:]|=>?|->|[<>]=?|[!+\-*/^#|@~]/,punctuation:/[(){}\[\].:,;]/},e.languages.sml["class-name"][0].inside=e.languages.sml,e.languages.smlnj=e.languages.sml}(Prism);