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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/lisp.js +1

@@ -0,0 +1 @@
1 !function(e){function n(e){return RegExp("(\\()(?:"+e+")(?=[\\s\\)])")}function a(e){return RegExp("([\\s([])(?:"+e+")(?=[\\s)])")}var t="(?!\\d)[-+*/~!@$%^=<>{}\\w]+",r="(\\()",i="(?:[^()]|\\((?:[^()]|\\((?:[^()]|\\((?:[^()]|\\((?:[^()]|\\([^()]*\\))*\\))*\\))*\\))*\\))*",s={heading:{pattern:/;;;.*/,alias:["comment","title"]},comment:/;.*/,string:{pattern:/"(?:[^"\\]|\\.)*"/,greedy:!0,inside:{argument:/[-A-Z]+(?=[.,\s])/,symbol:RegExp("`"+t+"'")}},"quoted-symbol":{pattern:RegExp("#?'"+t),alias:["variable","symbol"]},"lisp-property":{pattern:RegExp(":"+t),alias:"property"},splice:{pattern:RegExp(",@?"+t),alias:["symbol","variable"]},keyword:[{pattern:RegExp("(\\()(?:and|(?:cl-)?letf|cl-loop|cond|cons|error|if|(?:lexical-)?let\\*?|message|not|null|or|provide|require|setq|unless|use-package|when|while)(?=\\s)"),lookbehind:!0},{pattern:RegExp("(\\()(?:append|by|collect|concat|do|finally|for|in|return)(?=\\s)"),lookbehind:!0}],declare:{pattern:n("declare"),lookbehind:!0,alias:"keyword"},interactive:{pattern:n("interactive"),lookbehind:!0,alias:"keyword"},boolean:{pattern:a("nil|t"),lookbehind:!0},number:{pattern:a("[-+]?\\d+(?:\\.\\d*)?"),lookbehind:!0},defvar:{pattern:RegExp("(\\()def(?:const|custom|group|var)\\s+"+t),lookbehind:!0,inside:{keyword:/^def[a-z]+/,variable:RegExp(t)}},defun:{pattern:RegExp("(\\()(?:cl-)?(?:defmacro|defun\\*?)\\s+"+t+"\\s+\\("+i+"\\)"),lookbehind:!0,greedy:!0,inside:{keyword:/^(?:cl-)?def\S+/,arguments:null,function:{pattern:RegExp("(^\\s)"+t),lookbehind:!0},punctuation:/[()]/}},lambda:{pattern:RegExp("(\\()lambda\\s+\\(\\s*(?:&?"+t+"(?:\\s+&?"+t+")*\\s*)?\\)"),lookbehind:!0,greedy:!0,inside:{keyword:/^lambda/,arguments:null,punctuation:/[()]/}},car:{pattern:RegExp(r+t),lookbehind:!0},punctuation:[/(?:['`,]?\(|[)\[\]])/,{pattern:/(\s)\.(?=\s)/,lookbehind:!0}]},l={"lisp-marker":RegExp("&(?!\\d)[-+*/~!@$%^=<>{}\\w]+"),varform:{pattern:RegExp("\\("+t+"\\s+(?=\\S)"+i+"\\)"),inside:s},argument:{pattern:RegExp("(^|[\\s(])"+t),lookbehind:!0,alias:"variable"},rest:s},o="\\S+(?:\\s+\\S+)*",p={pattern:RegExp(r+i+"(?=\\))"),lookbehind:!0,inside:{"rest-vars":{pattern:RegExp("&(?:body|rest)\\s+"+o),inside:l},"other-marker-vars":{pattern:RegExp("&(?:aux|optional)\\s+"+o),inside:l},keys:{pattern:RegExp("&key\\s+"+o+"(?:\\s+&allow-other-keys)?"),inside:l},argument:{pattern:RegExp(t),alias:"variable"},punctuation:/[()]/}};s.lambda.inside.arguments=p,s.defun.inside.arguments=e.util.clone(p),s.defun.inside.arguments.inside.sublist=p,e.languages.lisp=s,e.languages.elisp=s,e.languages.emacs=s,e.languages["emacs-lisp"]=s}(Prism);