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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/zig.js +1

@@ -0,0 +1 @@
1 !function(e){function n(e){return function(){return e}}var r=/\b(?:align|allowzero|and|anyframe|anytype|asm|async|await|break|cancel|catch|comptime|const|continue|defer|else|enum|errdefer|error|export|extern|fn|for|if|inline|linksection|nakedcc|noalias|nosuspend|null|or|orelse|packed|promise|pub|resume|return|stdcallcc|struct|suspend|switch|test|threadlocal|try|undefined|union|unreachable|usingnamespace|var|volatile|while)\b/,a="\\b(?!"+r.source+")(?!\\d)\\w+\\b",o="align\\s*\\((?:[^()]|\\([^()]*\\))*\\)",s="(?!\\s)(?:!?\\s*(?:"+"(?:\\?|\\bpromise->|(?:\\[[^[\\]]*\\]|\\*(?!\\*)|\\*\\*)(?:\\s*<ALIGN>|\\s*const\\b|\\s*volatile\\b|\\s*allowzero\\b)*)".replace(/<ALIGN>/g,n(o))+"\\s*)*"+"(?:\\bpromise\\b|(?:\\berror\\.)?<ID>(?:\\.<ID>)*(?!\\s+<ID>))".replace(/<ID>/g,n(a))+")+";e.languages.zig={comment:[{pattern:/\/\/[/!].*/,alias:"doc-comment"},/\/{2}.*/],string:[{pattern:/(^|[^\\@])c?"(?:[^"\\\r\n]|\\.)*"/,lookbehind:!0,greedy:!0},{pattern:/([\r\n])([ \t]+c?\\{2}).*(?:(?:\r\n?|\n)\2.*)*/,lookbehind:!0,greedy:!0}],char:{pattern:/(^|[^\\])'(?:[^'\\\r\n]|[\uD800-\uDFFF]{2}|\\(?:.|x[a-fA-F\d]{2}|u\{[a-fA-F\d]{1,6}\}))'/,lookbehind:!0,greedy:!0},builtin:/\B@(?!\d)\w+(?=\s*\()/,label:{pattern:/(\b(?:break|continue)\s*:\s*)\w+\b|\b(?!\d)\w+\b(?=\s*:\s*(?:\{|while\b))/,lookbehind:!0},"class-name":[/\b(?!\d)\w+(?=\s*=\s*(?:(?:extern|packed)\s+)?(?:enum|struct|union)\s*[({])/,{pattern:RegExp("(:\\s*)<TYPE>(?=\\s*(?:<ALIGN>\\s*)?[=;,)])|<TYPE>(?=\\s*(?:<ALIGN>\\s*)?\\{)".replace(/<TYPE>/g,n(s)).replace(/<ALIGN>/g,n(o))),lookbehind:!0,inside:null},{pattern:RegExp("(\\)\\s*)<TYPE>(?=\\s*(?:<ALIGN>\\s*)?;)".replace(/<TYPE>/g,n(s)).replace(/<ALIGN>/g,n(o))),lookbehind:!0,inside:null}],"builtin-type":{pattern:/\b(?:anyerror|bool|c_u?(?:int|long|longlong|short)|c_longdouble|c_void|comptime_(?:float|int)|f(?:16|32|64|128)|[iu](?:8|16|32|64|128|size)|noreturn|type|void)\b/,alias:"keyword"},keyword:r,function:/\b(?!\d)\w+(?=\s*\()/,number:/\b(?:0b[01]+|0o[0-7]+|0x[a-fA-F\d]+(?:\.[a-fA-F\d]*)?(?:[pP][+-]?[a-fA-F\d]+)?|\d+(?:\.\d*)?(?:[eE][+-]?\d+)?)\b/,boolean:/\b(?:false|true)\b/,operator:/\.[*?]|\.{2,3}|[-=]>|\*\*|\+\+|\|\||(?:<<|>>|[-+*]%|[-+*/%^&|<>!=])=?|[?~]/,punctuation:/[.:,;(){}[\]]/},e.languages.zig["class-name"].forEach((function(n){null===n.inside&&(n.inside=e.languages.zig)}))}(Prism);