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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/cshtml.js +1

@@ -0,0 +1 @@
1 !function(e){function s(e,s){for(var a=0;a<s;a++)e=e.replace(/<self>/g,(function(){return"(?:"+e+")"}));return e.replace(/<self>/g,"[^\\s\\S]").replace(/<str>/g,'(?:@(?!")|"(?:[^\r\n\\\\"]|\\\\.)*"|@"(?:[^\\\\"]|""|\\\\[^])*"(?!")|\'(?:(?:[^\r\n\'\\\\]|\\\\.|\\\\[Uux][\\da-fA-F]{1,8})\'|(?=[^\\\\](?!\'))))').replace(/<comment>/g,"(?:/(?![/*])|//.*[\r\n]|/\\*[^*]*(?:\\*(?!/)[^*]*)*\\*/)")}var a=s("\\((?:[^()'\"@/]|<str>|<comment>|<self>)*\\)",2),t=s("\\[(?:[^\\[\\]'\"@/]|<str>|<comment>|<self>)*\\]",1),r=s("\\{(?:[^{}'\"@/]|<str>|<comment>|<self>)*\\}",2),n="@(?:await\\b\\s*)?(?:(?!await\\b)\\w+\\b|"+a+")(?:[?!]?\\.\\w+\\b|(?:"+s("<(?:[^<>'\"@/]|<comment>|<self>)*>",1)+")?"+a+"|"+t+")*(?![?!\\.(\\[]|<(?!/))",l="(?:\"[^\"@]*\"|'[^'@]*'|[^\\s'\"@>=]+(?=[\\s>])|[\"'][^\"'@]*(?:(?:@(?![\\w()])|"+n+")[^\"'@]*)+[\"'])",i="(?:\\s(?:\\s*[^\\s>/=]+(?:\\s*=\\s*<tagAttrValue>|(?=[\\s/>])))+)?".replace(/<tagAttrValue>/,l),g="(?!\\d)[^\\s>/=$<%]+"+i+"\\s*/?>",o="\\B@?(?:<([a-zA-Z][\\w:]*)"+i+"\\s*>(?:[^<]|</?(?!\\1\\b)"+g+"|"+s("<\\1"+i+"\\s*>(?:[^<]|</?(?!\\1\\b)"+g+"|<self>)*</\\1\\s*>",2)+")*</\\1\\s*>|<"+g+")";e.languages.cshtml=e.languages.extend("markup",{});var c={pattern:/\S[\s\S]*/,alias:"language-csharp",inside:e.languages.insertBefore("csharp","string",{html:{pattern:RegExp(o),greedy:!0,inside:e.languages.cshtml}},{csharp:e.languages.extend("csharp",{})})},p={pattern:RegExp("(^|[^@])"+n),lookbehind:!0,greedy:!0,alias:"variable",inside:{keyword:/^@/,csharp:c}};e.languages.cshtml.tag.pattern=RegExp("</?"+g),e.languages.cshtml.tag.inside["attr-value"].pattern=RegExp("=\\s*"+l),e.languages.insertBefore("inside","punctuation",{value:p},e.languages.cshtml.tag.inside["attr-value"]),e.languages.insertBefore("cshtml","prolog",{"razor-comment":{pattern:/@\*[\s\S]*?\*@/,greedy:!0,alias:"comment"},block:{pattern:RegExp("(^|[^@])@(?:"+[r,"(?:code|functions)\\s*"+r,"(?:for|foreach|lock|switch|using|while)\\s*"+a+"\\s*"+r,"do\\s*"+r+"\\s*while\\s*"+a+"(?:\\s*;)?","try\\s*"+r+"\\s*catch\\s*"+a+"\\s*"+r+"\\s*finally\\s*"+r,"if\\s*"+a+"\\s*"+r+"(?:\\s*else(?:\\s+if\\s*"+a+")?\\s*"+r+")*","helper\\s+\\w+\\s*"+a+"\\s*"+r].join("|")+")"),lookbehind:!0,greedy:!0,inside:{keyword:/^@\w*/,csharp:c}},directive:{pattern:/^([ \t]*)@(?:addTagHelper|attribute|implements|inherits|inject|layout|model|namespace|page|preservewhitespace|removeTagHelper|section|tagHelperPrefix|using)(?=\s).*/m,lookbehind:!0,greedy:!0,inside:{keyword:/^@\w+/,csharp:c}},value:p,"delegate-operator":{pattern:/(^|[^@])@(?=<)/,lookbehind:!0,alias:"operator"}}),e.languages.razor=e.languages.cshtml}(Prism);