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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/lolcode.js +1

@@ -0,0 +1 @@
1 Prism.languages.lolcode={comment:[/\bOBTW\s[\s\S]*?\sTLDR\b/,/\bBTW.+/],string:{pattern:/"(?::.|[^":])*"/,inside:{variable:/:\{[^}]+\}/,symbol:[/:\([a-f\d]+\)/i,/:\[[^\]]+\]/,/:[)>o":]/]},greedy:!0},number:/(?:\B-)?(?:\b\d+(?:\.\d*)?|\B\.\d+)/,symbol:{pattern:/(^|\s)(?:A )?(?:BUKKIT|NOOB|NUMBAR|NUMBR|TROOF|YARN)(?=\s|,|$)/,lookbehind:!0,inside:{keyword:/A(?=\s)/}},label:{pattern:/((?:^|\s)(?:IM IN YR|IM OUTTA YR) )[a-zA-Z]\w*/,lookbehind:!0,alias:"string"},function:{pattern:/((?:^|\s)(?:HOW IZ I|I IZ|IZ) )[a-zA-Z]\w*/,lookbehind:!0},keyword:[{pattern:/(^|\s)(?:AN|FOUND YR|GIMMEH|GTFO|HAI|HAS A|HOW IZ I|I HAS A|I IZ|IF U SAY SO|IM IN YR|IM OUTTA YR|IS NOW(?: A)?|ITZ(?: A)?|IZ|KTHX|KTHXBYE|LIEK(?: A)?|MAEK|MEBBE|MKAY|NERFIN|NO WAI|O HAI IM|O RLY\?|OIC|OMG|OMGWTF|R|SMOOSH|SRS|TIL|UPPIN|VISIBLE|WILE|WTF\?|YA RLY|YR)(?=\s|,|$)/,lookbehind:!0},/'Z(?=\s|,|$)/],boolean:{pattern:/(^|\s)(?:FAIL|WIN)(?=\s|,|$)/,lookbehind:!0},variable:{pattern:/(^|\s)IT(?=\s|,|$)/,lookbehind:!0},operator:{pattern:/(^|\s)(?:NOT|BOTH SAEM|DIFFRINT|(?:ALL|ANY|BIGGR|BOTH|DIFF|EITHER|MOD|PRODUKT|QUOSHUNT|SMALLR|SUM|WON) OF)(?=\s|,|$)/,lookbehind:!0},punctuation:/\.{3}|…|,|!/};