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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/moonscript.js +1

@@ -0,0 +1 @@
1 Prism.languages.moonscript={comment:/--.*/,string:[{pattern:/'[^']*'|\[(=*)\[[\s\S]*?\]\1\]/,greedy:!0},{pattern:/"[^"]*"/,greedy:!0,inside:{interpolation:{pattern:/#\{[^{}]*\}/,inside:{moonscript:{pattern:/(^#\{)[\s\S]+(?=\})/,lookbehind:!0,inside:null},"interpolation-punctuation":{pattern:/#\{|\}/,alias:"punctuation"}}}}}],"class-name":[{pattern:/(\b(?:class|extends)[ \t]+)\w+/,lookbehind:!0},/\b[A-Z]\w*/],keyword:/\b(?:class|continue|do|else|elseif|export|extends|for|from|if|import|in|local|nil|return|self|super|switch|then|unless|using|when|while|with)\b/,variable:/@@?\w*/,property:{pattern:/\b(?!\d)\w+(?=:)|(:)(?!\d)\w+/,lookbehind:!0},function:{pattern:/\b(?:_G|_VERSION|assert|collectgarbage|coroutine\.(?:create|resume|running|status|wrap|yield)|debug\.(?:debug|getfenv|gethook|getinfo|getlocal|getmetatable|getregistry|getupvalue|setfenv|sethook|setlocal|setmetatable|setupvalue|traceback)|dofile|error|getfenv|getmetatable|io\.(?:close|flush|input|lines|open|output|popen|read|stderr|stdin|stdout|tmpfile|type|write)|ipairs|load|loadfile|loadstring|math\.(?:abs|acos|asin|atan|atan2|ceil|cos|cosh|deg|exp|floor|fmod|frexp|ldexp|log|log10|max|min|modf|pi|pow|rad|random|randomseed|sin|sinh|sqrt|tan|tanh)|module|next|os\.(?:clock|date|difftime|execute|exit|getenv|remove|rename|setlocale|time|tmpname)|package\.(?:cpath|loaded|loadlib|path|preload|seeall)|pairs|pcall|print|rawequal|rawget|rawset|require|select|setfenv|setmetatable|string\.(?:byte|char|dump|find|format|gmatch|gsub|len|lower|match|rep|reverse|sub|upper)|table\.(?:concat|insert|maxn|remove|sort)|tonumber|tostring|type|unpack|xpcall)\b/,inside:{punctuation:/\./}},boolean:/\b(?:false|true)\b/,number:/(?:\B\.\d+|\b\d+\.\d+|\b\d+(?=[eE]))(?:[eE][-+]?\d+)?\b|\b(?:0x[a-fA-F\d]+|\d+)(?:U?LL)?\b/,operator:/\.{3}|[-=]>|~=|(?:[-+*/%<>!=]|\.\.)=?|[:#^]|\b(?:and|or)\b=?|\b(?:not)\b/,punctuation:/[.,()[\]{}\\]/},Prism.languages.moonscript.string[1].inside.interpolation.inside.moonscript.inside=Prism.languages.moonscript,Prism.languages.moon=Prism.languages.moonscript;