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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/shell-session.js +1

@@ -0,0 +1 @@
		1	!function(s){var n=['"(?:\\\\[^]\|\\$\$[^)]+\$\|\\$(?!\\()\|`[^`]+`\|[^"\\\\`$])"',"'[^']'","\\$'(?:[^'\\\\]\|\\\\[^])'","<<-?\\s([\"']?)(\\w+)\\1\\s[^]?[\r\n]\\2"].join("\|");s.languages["shell-session"]={command:{pattern:RegExp('^(?:[^\\s@:$#%!/\\\\]+@[^\r\n@:$#%!/\\\\]+(?::[^\0-\\x1F$#%?"<>:;\|]+)?\|[/~.][^\0-\\x1F$#%?"<>@:;\|])?[$#%](?=\\s)'+"(?:[^\\\\\r\n \t'\"<$]\|[ \t](?:(?!#)\|#.$)\|\\\\(?:[^\r]\|\r\n?)\|\\$(?!')\|<(?!<)\|<<str>>)+".replace(/<<str>>/g,(function(){return n})),"m"),greedy:!0,inside:{info:{pattern:/^[^#$%]+/,alias:"punctuation",inside:{user:/^[^\s@:$#%!/\\]+@[^\r\n@:$#%!/\\]+/,punctuation:/:/,path:/[\s\S]+/}},bash:{pattern:/(^[$#%]\s)\S[\s\S]/,lookbehind:!0,alias:"language-bash",inside:s.languages.bash},"shell-symbol":{pattern:/^[$#%]/,alias:"important"}}},output:/.(?:.(?:[\r\n]\|.$))*/},s.languages["sh-session"]=s.languages.shellsession=s.languages["shell-session"]}(Prism);

@@ -0,0 +1 @@
		1	!function(s){var n=['"(?:\\\\[^]\|\\$\\([^)]+\\)\|\\$(?!\\()\|`[^`]+`\|[^"\\\\`$])"',"'[^']'","\\$'(?:[^'\\\\]\|\\\\[^])'","<<-?\\s([\"']?)(\\w+)\\1\\s[^]?[\r\n]\\2"].join("\|");s.languages["shell-session"]={command:{pattern:RegExp('^(?:[^\\s@:$#%!/\\\\]+@[^\r\n@:$#%!/\\\\]+(?::[^\0-\\x1F$#%?"<>:;\|]+)?\|[/~.][^\0-\\x1F$#%?"<>@:;\|])?[$#%](?=\\s)'+"(?:[^\\\\\r\n \t'\"<$]\|[ \t](?:(?!#)\|#.$)\|\\\\(?:[^\r]\|\r\n?)\|\\$(?!')\|<(?!<)\|<<str>>)+".replace(/<<str>>/g,(function(){return n})),"m"),greedy:!0,inside:{info:{pattern:/^[^#$%]+/,alias:"punctuation",inside:{user:/^[^\s@:$#%!/\\]+@[^\r\n@:$#%!/\\]+/,punctuation:/:/,path:/[\s\S]+/}},bash:{pattern:/(^[$#%]\s)\S[\s\S]/,lookbehind:!0,alias:"language-bash",inside:s.languages.bash},"shell-symbol":{pattern:/^[$#%]/,alias:"important"}}},output:/.(?:.(?:[\r\n]\|.$))*/},s.languages["sh-session"]=s.languages.shellsession=s.languages["shell-session"]}(Prism);