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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/icu-message-format.js +1

@@ -0,0 +1 @@
1 !function(e){function t(e,s){return s<=0?"[]":e.replace(/<SELF>/g,(function(){return t(e,s-1)}))}var s=/'[{}:=,](?:[^']|'')*'(?!')/,n={pattern:/''/,greedy:!0,alias:"operator"},r={pattern:s,greedy:!0,inside:{escape:n}},a=t("\\{(?:[^{}']|'(?![{},'])|''|<STR>|<SELF>)*\\}".replace(/<STR>/g,(function(){return s.source})),8),i={pattern:RegExp(a),inside:{message:{pattern:/^(\{)[\s\S]+(?=\}$)/,lookbehind:!0,inside:null},"message-delimiter":{pattern:/./,alias:"punctuation"}}};e.languages["icu-message-format"]={argument:{pattern:RegExp(a),greedy:!0,inside:{content:{pattern:/^(\{)[\s\S]+(?=\}$)/,lookbehind:!0,inside:{"argument-name":{pattern:/^(\s*)[^{}:=,\s]+/,lookbehind:!0},"choice-style":{pattern:/^(\s*,\s*choice\s*,\s*)\S(?:[\s\S]*\S)?/,lookbehind:!0,inside:{punctuation:/\|/,range:{pattern:/^(\s*)[+-]?(?:\d+(?:\.\d*)?|\u221e)\s*[<#\u2264]/,lookbehind:!0,inside:{operator:/[<#\u2264]/,number:/\S+/}},rest:null}},"plural-style":{pattern:/^(\s*,\s*(?:plural|selectordinal)\s*,\s*)\S(?:[\s\S]*\S)?/,lookbehind:!0,inside:{offset:/^offset:\s*\d+/,"nested-message":i,selector:{pattern:/=\d+|[^{}:=,\s]+/,inside:{keyword:/^(?:few|many|one|other|two|zero)$/}}}},"select-style":{pattern:/^(\s*,\s*select\s*,\s*)\S(?:[\s\S]*\S)?/,lookbehind:!0,inside:{"nested-message":i,selector:{pattern:/[^{}:=,\s]+/,inside:{keyword:/^other$/}}}},keyword:/\b(?:choice|plural|select|selectordinal)\b/,"arg-type":{pattern:/\b(?:date|duration|number|ordinal|spellout|time)\b/,alias:"keyword"},"arg-skeleton":{pattern:/(,\s*)::[^{}:=,\s]+/,lookbehind:!0},"arg-style":{pattern:/(,\s*)(?:currency|full|integer|long|medium|percent|short)(?=\s*$)/,lookbehind:!0},"arg-style-text":{pattern:RegExp("(^\\s*,\\s*(?=\\S))"+t("(?:[^{}']|'[^']*'|\\{(?:<SELF>)?\\})+",8)+"$"),lookbehind:!0,alias:"string"},punctuation:/,/}},"argument-delimiter":{pattern:/./,alias:"operator"}}},escape:n,string:r},i.inside.message.inside=e.languages["icu-message-format"],e.languages["icu-message-format"].argument.inside.content.inside["choice-style"].inside.rest=e.languages["icu-message-format"]}(Prism);