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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/makefile.js +1

@@ -0,0 +1 @@
		1	Prism.languages.makefile={comment:{pattern:/(^\|[^\\])#(?:\$?:\r\n\|[\s\S])\|[^\\\r\n])/,lookbehind:!0},string:{pattern:/(["'])(?:\\(?:\r\n\|[\s\S])\|(?!\1)[^\\\r\n])\1/,greedy:!0},"builtin-target":{pattern:/\.[A-Z][^:#=\s]+(?=\s:(?!=))/,alias:"builtin"},target:{pattern:/^(?:[^:=\s]\|[ \t]+(?![\s:]))+(?=\s:(?!=))/m,alias:"symbol",inside:{variable:/\$+(?:(?!\$)[^(){}:#=\s]+\|(?=[({]))/}},variable:/\$+(?:(?!\$)[^(){}:#=\s]+\|\([@*%<^+?][DF]$\|(?=[({]))/,keyword:/-include\b\|\b(?:define\|else\|endef\|endif\|export\|ifn?def\|ifn?eq\|include\|override\|private\|sinclude\|undefine\|unexport\|vpath)\b/,function:{pattern:/(\()(?:abspath\|addsuffix\|and\|basename\|call\|dir\|error\|eval\|file\|filter(?:-out)?\|findstring\|firstword\|flavor\|foreach\|guile\|if\|info\|join\|lastword\|load\|notdir\|or\|origin\|patsubst\|realpath\|shell\|sort\|strip\|subst\|suffix\|value\|warning\|wildcard\|word(?:list\|s)?)(?=[ \t])/,lookbehind:!0},operator:/(?:::\|[?:+!])?=\|[\|@]/,punctuation:/[:;(){}]/};

@@ -0,0 +1 @@
		1	Prism.languages.makefile={comment:{pattern:/(^\|[^\\])#(?:\\(?:\r\n\|[\s\S])\|[^\\\r\n])/,lookbehind:!0},string:{pattern:/(["'])(?:\\(?:\r\n\|[\s\S])\|(?!\1)[^\\\r\n])\1/,greedy:!0},"builtin-target":{pattern:/\.[A-Z][^:#=\s]+(?=\s:(?!=))/,alias:"builtin"},target:{pattern:/^(?:[^:=\s]\|[ \t]+(?![\s:]))+(?=\s:(?!=))/m,alias:"symbol",inside:{variable:/\$+(?:(?!\$)[^(){}:#=\s]+\|(?=[({]))/}},variable:/\$+(?:(?!\$)[^(){}:#=\s]+\|\([@*%<^+?][DF]\)\|(?=[({]))/,keyword:/-include\b\|\b(?:define\|else\|endef\|endif\|export\|ifn?def\|ifn?eq\|include\|override\|private\|sinclude\|undefine\|unexport\|vpath)\b/,function:{pattern:/(\()(?:abspath\|addsuffix\|and\|basename\|call\|dir\|error\|eval\|file\|filter(?:-out)?\|findstring\|firstword\|flavor\|foreach\|guile\|if\|info\|join\|lastword\|load\|notdir\|or\|origin\|patsubst\|realpath\|shell\|sort\|strip\|subst\|suffix\|value\|warning\|wildcard\|word(?:list\|s)?)(?=[ \t])/,lookbehind:!0},operator:/(?:::\|[?:+!])?=\|[\|@]/,punctuation:/[:;(){}]/};