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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/tcl.js +1

@@ -0,0 +1 @@
1 Prism.languages.tcl={comment:{pattern:/(^|[^\\])#.*/,lookbehind:!0},string:{pattern:/"(?:[^"\\\r\n]|\\(?:\r\n|[\s\S]))*"/,greedy:!0},variable:[{pattern:/(\$)(?:::)?(?:[a-zA-Z0-9]+::)*\w+/,lookbehind:!0},{pattern:/(\$)\{[^}]+\}/,lookbehind:!0},{pattern:/(^[\t ]*set[ \t]+)(?:::)?(?:[a-zA-Z0-9]+::)*\w+/m,lookbehind:!0}],function:{pattern:/(^[\t ]*proc[ \t]+)\S+/m,lookbehind:!0},builtin:[{pattern:/(^[\t ]*)(?:break|class|continue|error|eval|exit|for|foreach|if|proc|return|switch|while)\b/m,lookbehind:!0},/\b(?:else|elseif)\b/],scope:{pattern:/(^[\t ]*)(?:global|upvar|variable)\b/m,lookbehind:!0,alias:"constant"},keyword:{pattern:/(^[\t ]*|\[)(?:Safe_Base|Tcl|after|append|apply|array|auto_(?:execok|import|load|mkindex|qualify|reset)|automkindex_old|bgerror|binary|catch|cd|chan|clock|close|concat|dde|dict|encoding|eof|exec|expr|fblocked|fconfigure|fcopy|file(?:event|name)?|flush|gets|glob|history|http|incr|info|interp|join|lappend|lassign|lindex|linsert|list|llength|load|lrange|lrepeat|lreplace|lreverse|lsearch|lset|lsort|math(?:func|op)|memory|msgcat|namespace|open|package|parray|pid|pkg_mkIndex|platform|puts|pwd|re_syntax|read|refchan|regexp|registry|regsub|rename|scan|seek|set|socket|source|split|string|subst|tcl(?:_endOfWord|_findLibrary|startOf(?:Next|Previous)Word|test|vars|wordBreak(?:After|Before))|tell|time|tm|trace|unknown|unload|unset|update|uplevel|vwait)\b/m,lookbehind:!0},operator:/!=?|\*\*?|==|&&?|\|\|?|<[=<]?|>[=>]?|[-+~\/%?^]|\b(?:eq|in|ne|ni)\b/,punctuation:/[{}()\[\]]/};