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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/typoscript.js +1

@@ -0,0 +1 @@
1 !function(E){var n=/\b(?:ACT|ACTIFSUB|CARRAY|CASE|CLEARGIF|COA|COA_INT|CONSTANTS|CONTENT|CUR|EDITPANEL|EFFECT|EXT|FILE|FLUIDTEMPLATE|FORM|FRAME|FRAMESET|GIFBUILDER|GMENU|GMENU_FOLDOUT|GMENU_LAYERS|GP|HMENU|HRULER|HTML|IENV|IFSUB|IMAGE|IMGMENU|IMGMENUITEM|IMGTEXT|IMG_RESOURCE|INCLUDE_TYPOSCRIPT|JSMENU|JSMENUITEM|LLL|LOAD_REGISTER|NO|PAGE|RECORDS|RESTORE_REGISTER|TEMPLATE|TEXT|TMENU|TMENUITEM|TMENU_LAYERS|USER|USER_INT|_GIFBUILDER|global|globalString|globalVar)\b/;E.languages.typoscript={comment:[{pattern:/(^|[^\\])\/\*[\s\S]*?(?:\*\/|$)/,lookbehind:!0},{pattern:/(^|[^\\:= \t]|(?:^|[^= \t])[ \t]+)\/\/.*/,lookbehind:!0,greedy:!0},{pattern:/(^|[^"'])#.*/,lookbehind:!0,greedy:!0}],function:[{pattern:/<INCLUDE_TYPOSCRIPT:\s*source\s*=\s*(?:"[^"\r\n]*"|'[^'\r\n]*')\s*>/,inside:{string:{pattern:/"[^"\r\n]*"|'[^'\r\n]*'/,inside:{keyword:n}},keyword:{pattern:/INCLUDE_TYPOSCRIPT/}}},{pattern:/@import\s*(?:"[^"\r\n]*"|'[^'\r\n]*')/,inside:{string:/"[^"\r\n]*"|'[^'\r\n]*'/}}],string:{pattern:/^([^=]*=[< ]?)(?:(?!\]\n).)*/,lookbehind:!0,inside:{function:/\{\$.*\}/,keyword:n,number:/^\d+$/,punctuation:/[,|:]/}},keyword:n,number:{pattern:/\b\d+\s*[.{=]/,inside:{operator:/[.{=]/}},tag:{pattern:/\.?[-\w\\]+\.?/,inside:{punctuation:/\./}},punctuation:/[{}[\];(),.:|]/,operator:/[<>]=?|[!=]=?=?|--?|\+\+?|&&?|\|\|?|[?*/~^%]/},E.languages.tsconfig=E.languages.typoscript}(Prism);