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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/unrealscript.js +1

@@ -0,0 +1 @@
		1	Prism.languages.unrealscript={comment:/\/\/.\|\/\[\s\S]?\\//,string:{pattern:/(["'])(?:\$?:\r\n\|[\s\S])\|(?!\1)[^\\\r\n])\1/,greedy:!0},category:{pattern:/(\b(?:(?:autoexpand\|hide\|show)categories\|var)\s\()[^()]+(?=$)/,lookbehind:!0,greedy:!0,alias:"property"},metadata:{pattern:/(\w\s)<\s\w+\s=[^<>\|=\r\n]+(?:\\|\s\w+\s=[^<>\|=\r\n]+)>/,lookbehind:!0,greedy:!0,inside:{property:/\b\w+(?=\s=)/,operator:/=/,punctuation:/[<>\|]/}},macro:{pattern:/`\w+/,alias:"property"},"class-name":{pattern:/(\b(?:class\|enum\|extends\|interface\|state(?:)?\|struct\|within)\s+)\w+/,lookbehind:!0},keyword:/\b(?:abstract\|actor\|array\|auto\|autoexpandcategories\|bool\|break\|byte\|case\|class\|classgroup\|client\|coerce\|collapsecategories\|config\|const\|continue\|default\|defaultproperties\|delegate\|dependson\|deprecated\|do\|dontcollapsecategories\|editconst\|editinlinenew\|else\|enum\|event\|exec\|export\|extends\|final\|float\|for\|forcescriptorder\|foreach\|function\|goto\|guid\|hidecategories\|hidedropdown\|if\|ignores\|implements\|inherits\|input\|int\|interface\|iterator\|latent\|local\|material\|name\|native\|nativereplication\|noexport\|nontransient\|noteditinlinenew\|notplaceable\|operator\|optional\|out\|pawn\|perobjectconfig\|perobjectlocalized\|placeable\|postoperator\|preoperator\|private\|protected\|reliable\|replication\|return\|server\|showcategories\|simulated\|singular\|state\|static\|string\|struct\|structdefault\|structdefaultproperties\|switch\|texture\|transient\|travel\|unreliable\|until\|var\|vector\|while\|within)\b/,function:/\b[a-z_]\w(?=\s\()/i,boolean:/\b(?:false\|true)\b/,number:/\b0x[\da-f]+\b\|(?:\b\d+(?:\.\d)?\|\B\.\d+)(?:e[+-]?\d+)?/i,operator:/>>\|<<\|--\|\+\+\|\\\|[-+*/~!=<>$@]=?\|&&?\|\\|\\|?\|\^\^?\|[?:%]\|\b(?:ClockwiseFrom\|Cross\|Dot)\b/,punctuation:/[()[\]{};,.]/},Prism.languages.uc=Prism.languages.uscript=Prism.languages.unrealscript;

@@ -0,0 +1 @@
		1	Prism.languages.unrealscript={comment:/\/\/.\|\/\[\s\S]?\\//,string:{pattern:/(["'])(?:\\(?:\r\n\|[\s\S])\|(?!\1)[^\\\r\n])\1/,greedy:!0},category:{pattern:/(\b(?:(?:autoexpand\|hide\|show)categories\|var)\s\()[^()]+(?=\))/,lookbehind:!0,greedy:!0,alias:"property"},metadata:{pattern:/(\w\s)<\s\w+\s=[^<>\|=\r\n]+(?:\\|\s\w+\s=[^<>\|=\r\n]+)>/,lookbehind:!0,greedy:!0,inside:{property:/\b\w+(?=\s=)/,operator:/=/,punctuation:/[<>\|]/}},macro:{pattern:/`\w+/,alias:"property"},"class-name":{pattern:/(\b(?:class\|enum\|extends\|interface\|state(?:\(\))?\|struct\|within)\s+)\w+/,lookbehind:!0},keyword:/\b(?:abstract\|actor\|array\|auto\|autoexpandcategories\|bool\|break\|byte\|case\|class\|classgroup\|client\|coerce\|collapsecategories\|config\|const\|continue\|default\|defaultproperties\|delegate\|dependson\|deprecated\|do\|dontcollapsecategories\|editconst\|editinlinenew\|else\|enum\|event\|exec\|export\|extends\|final\|float\|for\|forcescriptorder\|foreach\|function\|goto\|guid\|hidecategories\|hidedropdown\|if\|ignores\|implements\|inherits\|input\|int\|interface\|iterator\|latent\|local\|material\|name\|native\|nativereplication\|noexport\|nontransient\|noteditinlinenew\|notplaceable\|operator\|optional\|out\|pawn\|perobjectconfig\|perobjectlocalized\|placeable\|postoperator\|preoperator\|private\|protected\|reliable\|replication\|return\|server\|showcategories\|simulated\|singular\|state\|static\|string\|struct\|structdefault\|structdefaultproperties\|switch\|texture\|transient\|travel\|unreliable\|until\|var\|vector\|while\|within)\b/,function:/\b[a-z_]\w(?=\s\()/i,boolean:/\b(?:false\|true)\b/,number:/\b0x[\da-f]+\b\|(?:\b\d+(?:\.\d)?\|\B\.\d+)(?:e[+-]?\d+)?/i,operator:/>>\|<<\|--\|\+\+\|\\\|[-+*/~!=<>$@]=?\|&&?\|\\|\\|?\|\^\^?\|[?:%]\|\b(?:ClockwiseFrom\|Cross\|Dot)\b/,punctuation:/[()[\]{};,.]/},Prism.languages.uc=Prism.languages.uscript=Prism.languages.unrealscript;