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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/apex.js +1

@@ -0,0 +1 @@
1 !function(e){var t=/\b(?:(?:after|before)(?=\s+[a-z])|abstract|activate|and|any|array|as|asc|autonomous|begin|bigdecimal|blob|boolean|break|bulk|by|byte|case|cast|catch|char|class|collect|commit|const|continue|currency|date|datetime|decimal|default|delete|desc|do|double|else|end|enum|exception|exit|export|extends|final|finally|float|for|from|get(?=\s*[{};])|global|goto|group|having|hint|if|implements|import|in|inner|insert|instanceof|int|integer|interface|into|join|like|limit|list|long|loop|map|merge|new|not|null|nulls|number|object|of|on|or|outer|override|package|parallel|pragma|private|protected|public|retrieve|return|rollback|select|set|short|sObject|sort|static|string|super|switch|synchronized|system|testmethod|then|this|throw|time|transaction|transient|trigger|try|undelete|update|upsert|using|virtual|void|webservice|when|where|while|(?:inherited|with|without)\s+sharing)\b/i,n="\\b(?:(?=[a-z_]\\w*\\s*[<\\[])|(?!<keyword>))[A-Z_]\\w*(?:\\s*\\.\\s*[A-Z_]\\w*)*\\b(?:\\s*(?:\\[\\s*\\]|<(?:[^<>]|<(?:[^<>]|<[^<>]*>)*>)*>))*".replace(/<keyword>/g,(function(){return t.source}));function i(e){return RegExp(e.replace(/<CLASS-NAME>/g,(function(){return n})),"i")}var a={keyword:t,punctuation:/[()\[\]{};,:.<>]/};e.languages.apex={comment:e.languages.clike.comment,string:e.languages.clike.string,sql:{pattern:/((?:[=,({:]|\breturn)\s*)\[[^\[\]]*\]/i,lookbehind:!0,greedy:!0,alias:"language-sql",inside:e.languages.sql},annotation:{pattern:/@\w+\b/,alias:"punctuation"},"class-name":[{pattern:i("(\\b(?:class|enum|extends|implements|instanceof|interface|new|trigger\\s+\\w+\\s+on)\\s+)<CLASS-NAME>"),lookbehind:!0,inside:a},{pattern:i("(\\(\\s*)<CLASS-NAME>(?=\\s*\\)\\s*[\\w(])"),lookbehind:!0,inside:a},{pattern:i("<CLASS-NAME>(?=\\s*\\w+\\s*[;=,(){:])"),inside:a}],trigger:{pattern:/(\btrigger\s+)\w+\b/i,lookbehind:!0,alias:"class-name"},keyword:t,function:/\b[a-z_]\w*(?=\s*\()/i,boolean:/\b(?:false|true)\b/i,number:/(?:\B\.\d+|\b\d+(?:\.\d+|L)?)\b/i,operator:/[!=](?:==?)?|\?\.?|&&|\|\||--|\+\+|[-+*/^&|]=?|:|<<?=?|>{1,3}=?/,punctuation:/[()\[\]{};,.]/}}(Prism);