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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/clojure.js +1

@@ -0,0 +1 @@
1 Prism.languages.clojure={comment:{pattern:/;.*/,greedy:!0},string:{pattern:/"(?:[^"\\]|\\.)*"/,greedy:!0},char:/\\\w+/,symbol:{pattern:/(^|[\s()\[\]{},])::?[\w*+!?'<>=/.-]+/,lookbehind:!0},keyword:{pattern:/(\()(?:-|->|->>|\.|\.\.|\*|\/|\+|<|<=|=|==|>|>=|accessor|agent|agent-errors|aget|alength|all-ns|alter|and|append-child|apply|array-map|aset|aset-boolean|aset-byte|aset-char|aset-double|aset-float|aset-int|aset-long|aset-short|assert|assoc|await|await-for|bean|binding|bit-and|bit-not|bit-or|bit-shift-left|bit-shift-right|bit-xor|boolean|branch\?|butlast|byte|cast|char|children|class|clear-agent-errors|comment|commute|comp|comparator|complement|concat|cond|conj|cons|constantly|construct-proxy|contains\?|count|create-ns|create-struct|cycle|dec|declare|def|def-|definline|definterface|defmacro|defmethod|defmulti|defn|defn-|defonce|defproject|defprotocol|defrecord|defstruct|deftype|deref|difference|disj|dissoc|distinct|do|doall|doc|dorun|doseq|dosync|dotimes|doto|double|down|drop|drop-while|edit|end\?|ensure|eval|every\?|false\?|ffirst|file-seq|filter|find|find-doc|find-ns|find-var|first|float|flush|fn|fnseq|for|frest|gensym|get|get-proxy-class|hash-map|hash-set|identical\?|identity|if|if-let|if-not|import|in-ns|inc|index|insert-child|insert-left|insert-right|inspect-table|inspect-tree|instance\?|int|interleave|intersection|into|into-array|iterate|join|key|keys|keyword|keyword\?|last|lazy-cat|lazy-cons|left|lefts|let|line-seq|list|list\*|load|load-file|locking|long|loop|macroexpand|macroexpand-1|make-array|make-node|map|map-invert|map\?|mapcat|max|max-key|memfn|merge|merge-with|meta|min|min-key|monitor-enter|name|namespace|neg\?|new|newline|next|nil\?|node|not|not-any\?|not-every\?|not=|ns|ns-imports|ns-interns|ns-map|ns-name|ns-publics|ns-refers|ns-resolve|ns-unmap|nth|nthrest|or|parse|partial|path|peek|pop|pos\?|pr|pr-str|print|print-str|println|println-str|prn|prn-str|project|proxy|proxy-mappings|quot|quote|rand|rand-int|range|re-find|re-groups|re-matcher|re-matches|re-pattern|re-seq|read|read-line|recur|reduce|ref|ref-set|refer|rem|remove|remove-method|remove-ns|rename|rename-keys|repeat|replace|replicate|resolve|rest|resultset-seq|reverse|rfirst|right|rights|root|rrest|rseq|second|select|select-keys|send|send-off|seq|seq-zip|seq\?|set|set!|short|slurp|some|sort|sort-by|sorted-map|sorted-map-by|sorted-set|special-symbol\?|split-at|split-with|str|string\?|struct|struct-map|subs|subvec|symbol|symbol\?|sync|take|take-nth|take-while|test|throw|time|to-array|to-array-2d|tree-seq|true\?|try|union|up|update-proxy|val|vals|var|var-get|var-set|var\?|vector|vector-zip|vector\?|when|when-first|when-let|when-not|with-local-vars|with-meta|with-open|with-out-str|xml-seq|xml-zip|zero\?|zipmap|zipper)(?=[\s)]|$)/,lookbehind:!0},boolean:/\b(?:false|nil|true)\b/,number:{pattern:/(^|[^\w$@])(?:\d+(?:[/.]\d+)?(?:e[+-]?\d+)?|0x[a-f0-9]+|[1-9]\d?r[a-z0-9]+)[lmn]?(?![\w$@])/i,lookbehind:!0},function:{pattern:/((?:^|[^'])\()[\w*+!?'<>=/.-]+(?=[\s)]|$)/,lookbehind:!0},operator:/[#@^`~]/,punctuation:/[{}\[\](),]/};