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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/http.js +1

@@ -0,0 +1 @@
1 !function(t){function a(t){return RegExp("(^(?:"+t+"):[ \t]*(?![ \t]))[^]+","i")}t.languages.http={"request-line":{pattern:/^(?:CONNECT|DELETE|GET|HEAD|OPTIONS|PATCH|POST|PRI|PUT|SEARCH|TRACE)\s(?:https?:\/\/|\/)\S*\sHTTP\/[\d.]+/m,inside:{method:{pattern:/^[A-Z]+\b/,alias:"property"},"request-target":{pattern:/^(\s)(?:https?:\/\/|\/)\S*(?=\s)/,lookbehind:!0,alias:"url",inside:t.languages.uri},"http-version":{pattern:/^(\s)HTTP\/[\d.]+/,lookbehind:!0,alias:"property"}}},"response-status":{pattern:/^HTTP\/[\d.]+ \d+ .+/m,inside:{"http-version":{pattern:/^HTTP\/[\d.]+/,alias:"property"},"status-code":{pattern:/^(\s)\d+(?=\s)/,lookbehind:!0,alias:"number"},"reason-phrase":{pattern:/^(\s).+/,lookbehind:!0,alias:"string"}}},header:{pattern:/^[\w-]+:.+(?:(?:\r\n?|\n)[ \t].+)*/m,inside:{"header-value":[{pattern:a("Content-Security-Policy"),lookbehind:!0,alias:["csp","languages-csp"],inside:t.languages.csp},{pattern:a("Public-Key-Pins(?:-Report-Only)?"),lookbehind:!0,alias:["hpkp","languages-hpkp"],inside:t.languages.hpkp},{pattern:a("Strict-Transport-Security"),lookbehind:!0,alias:["hsts","languages-hsts"],inside:t.languages.hsts},{pattern:a("[^:]+"),lookbehind:!0}],"header-name":{pattern:/^[^:]+/,alias:"keyword"},punctuation:/^:/}}};var e,n=t.languages,s={"application/javascript":n.javascript,"application/json":n.json||n.javascript,"application/xml":n.xml,"text/xml":n.xml,"text/html":n.html,"text/css":n.css,"text/plain":n.plain},i={"application/json":!0,"application/xml":!0};function r(t){var a=t.replace(/^[a-z]+\//,"");return"(?:"+t+"|\\w+/(?:[\\w.-]+\\+)+"+a+"(?![+\\w.-]))"}for(var p in s)if(s[p]){e=e||{};var l=i[p]?r(p):p;e[p.replace(/\//g,"-")]={pattern:RegExp("(content-type:\\s*"+l+"(?:(?:\r\n?|\n)[\\w-].*)*(?:\r(?:\n|(?!\n))|\n))[^ \t\\w-][^]*","i"),lookbehind:!0,inside:s[p]}}e&&t.languages.insertBefore("http","header",e)}(Prism);