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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/maxscript.js +1

@@ -0,0 +1 @@
1 !function(t){var e=/\b(?:about|and|animate|as|at|attributes|by|case|catch|collect|continue|coordsys|do|else|exit|fn|for|from|function|global|if|in|local|macroscript|mapped|max|not|of|off|on|or|parameters|persistent|plugin|rcmenu|return|rollout|set|struct|then|throw|to|tool|try|undo|utility|when|where|while|with)\b/i;t.languages.maxscript={comment:{pattern:/\/\*[\s\S]*?(?:\*\/|$)|--.*/,greedy:!0},string:{pattern:/(^|[^"\\@])(?:"(?:[^"\\]|\\[\s\S])*"|@"[^"]*")/,lookbehind:!0,greedy:!0},path:{pattern:/\$(?:[\w/\\.*?]|'[^']*')*/,greedy:!0,alias:"string"},"function-call":{pattern:RegExp("((?:^|[;=<>+\\-*/^({\\[]|\\b(?:and|by|case|catch|collect|do|else|if|in|not|or|return|then|to|try|where|while|with)\\b)[ \t]*)(?!"+e.source+")[a-z_]\\w*\\b(?=[ \t]*(?:(?!"+e.source+")[a-z_]|\\d|-\\.?\\d|[({'\"$@#?]))","im"),lookbehind:!0,greedy:!0,alias:"function"},"function-definition":{pattern:/(\b(?:fn|function)\s+)\w+\b/i,lookbehind:!0,alias:"function"},argument:{pattern:/\b[a-z_]\w*(?=:)/i,alias:"attr-name"},keyword:e,boolean:/\b(?:false|true)\b/,time:{pattern:/(^|[^\w.])(?:(?:(?:\d+(?:\.\d*)?|\.\d+)(?:[eEdD][+-]\d+|[LP])?[msft])+|\d+:\d+(?:\.\d*)?)(?![\w.:])/,lookbehind:!0,alias:"number"},number:[{pattern:/(^|[^\w.])(?:(?:\d+(?:\.\d*)?|\.\d+)(?:[eEdD][+-]\d+|[LP])?|0x[a-fA-F0-9]+)(?![\w.:])/,lookbehind:!0},/\b(?:e|pi)\b/],constant:/\b(?:dontcollect|ok|silentValue|undefined|unsupplied)\b/,color:{pattern:/\b(?:black|blue|brown|gray|green|orange|red|white|yellow)\b/i,alias:"constant"},operator:/[-+*/<>=!]=?|[&^?]|#(?!\()/,punctuation:/[()\[\]{}.:,;]|#(?=\()|\\$/m}}(Prism);